Answers
Hypothesis testing is a formal procedure for investigating our ideas about the world using statistics. It is most often used by scientists to test specific predictions, called hypotheses, that arise from theories.
There are 5 main steps in hypothesis testing:
State your research hypothesis as a null and alternate hypothesis.
Collect data in a way designed to test the hypothesis.
Perform an appropriate statistical test.
Decide whether to reject or fail to reject your null hypothesis.
Present the findings in your results and discussion section.
Though the specific details might vary, the procedure you will use when testing a hypothesis will always follow some version of these step
Table of contents
State your null and alternate hypothesis
Collect data
Perform a statistical test
Decide whether to reject or fail to reject your null hypothesis
Present your findings
Frequently asked questions
If you want this is a Link I found just write the sentence below
Hypothesis Testing | A Step-by-Step Guide with Easy Examples
Related Questions
IF 23 g of FeCl2 reacts with 41g Na3PO4 what is the limiting reactant?
Answers
First, we need to figure the reaction out.
Both reactants are ionic compounds, so their reaction is probably a double displacemente reaction.
The Cl has a charge of 1-, so Fe has a charge of 2+. Na has a charge of +1 and PO₄ has a charge of 3-.
To combine Fe²⁺ with PO₄³⁻, we will need 3 Fe²⁺ and 2 PO₄³⁻, so the compound becomes neutral.
Both Na and Cl have single charge, so their combination is simply 1 Na and 1 Cl.
So, the products are Fe₃(PO₄)₂ and NaCl, so the unbalanced reaction is:
\(FeCl_2+Na_3PO_4\to Fe_3(PO_4)_2+NaCl\)To balance it, We can start by putting a coefficient of 2 on Na₃PO₄, so we have two PO₄³⁻ anions on both sides:
\(FeCl_2+2Na_3PO_4\to Fe_3(PO_4)_2+NaCl\)Now, we put a coefficient of 3 on FeCl₂ and 6 on NaCl to get the balanced equation:
\(3FeCl_2+2Na_3PO_4\to Fe_3(PO_4)_2+6NaCl\)Now, we first need to calculate the number of moles of each reactant, using their molar masses:
\(\begin{gathered} M_{FeCl_2}=1\cdot M_{Fe}+2\cdot M_{Cl}=(1\cdot55.845+2\cdot35.453)g/mol=126.751g/mol \\ M_{Na_3PO_4}=3\cdot M_{Na}+1\cdot M_P+4\cdot M_O=(3\cdot22.98976928+1\cdot30.973762+4\cdot15.9994)g/mol=163.94066984g/mol \end{gathered}\)So:
\(\begin{gathered} M_{FeCl_{2}}=\frac{m_{FeCl_2}}{n_{FeCl_{2}}} \\ n_{FeCl_2}=\frac{m_{FeCl_2}}{M_{FeCl_{2}}}=\frac{23g}{126.751g/mol}=0.181458\ldots mol \end{gathered}\)\(\begin{gathered} M_{Na_3PO_4}=\frac{m_{Na_3PO_4}}{n_{Na_{3}PO_{4}}} \\ n_{Na_3PO_4}=\frac{m_{Na_3PO_4}}{M_{Na_{3}PO_{4}}}=\frac{41g}{163.9406698g/mol}=0.250090\ldots mol \end{gathered}\)Now, if the coefficient of FeCl₂ is 3, for each 3 FeCl₂ that reacts, one reaction occurs, so the number of reactions that will need to occur to consume all its number of moles is that amount over 3:
\(n_{\text{reaction}}=\frac{n_{FeCl_2}}{3}=\frac{0.181458\ldots mol}{3}=0.060486\ldots mol\)Similarly, we get the number of reactions that would occur if all Na₃PO₄ reacts by dividing its number of moles by its coefficient, that is 2:
\(n_{\text{reaction}}=\frac{n_{Na_3PO_4}}{2}=\frac{0.250090\ldots mol}{2}=0.125045\ldots mol\)This means that the amount we have of FeCl₂ is enough for only about 0.0605 mol of reactions while the amount we have of Na₃PO₄ is enought for about 0.1250 mol of reactions, which is more than the other reactant.
This means that the reactant that limits the amount of reaction that can occur is FeCl₂, so the limiting reactant is FeCl₂.
Of the animals in the bottom row, which one is most likely to be a keystone species?
nuthatch
deer
frog
butterfly
Answers
Answer:
Deer
Explanatio
The deer is most likely to be a keystone species.
What is a Keystone species?This is defined as the organism which has a strong impact and defines the ecosystem.
The deer is a keystone species as many organisms depend on it as a source of food in the ecosystem.
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Help me please.
How do animals see their pray without light?
Answers
Answer:Many nocturnal animals have a mirror-like layer, called the tapetum, behind the retina, which helps them make the most of small amounts of light.
Explanation:
What leads directly to the formation
of black holes?
Answers
Answer:
When a star bigger than our sun, Collapse a black hole may" formed. Most of the time when a star collapse it explodes and this explosion is called "Super Nova".
Explanation:
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In the SOLID state of matter ,particles have enough energy to move freely but not enough energy to overcome their attraction for each other
Answers
In the solid state of matter, particles, such as atoms, ions, or molecules, are closely packed and held together by strong intermolecular forces, such as ionic bonds, metallic bonds, or covalent bonds.
In a solid, particles have enough energy to vibrate around fixed positions but do not have enough energy to overcome the attractive forces between them. These attractive forces, also known as cohesive forces, arise from the electrostatic interactions between particles or the sharing of electrons in covalent bonds.
The energy of the particles in a solid is typically much lower than in the liquid or gaseous states, resulting in a fixed arrangement of particles.
The movement of particles in a solid is characterized by vibrations or oscillations around their equilibrium positions.
These vibrations occur due to the thermal energy present in the solid, but the particles remain relatively fixed in their positions due to the strong attractive forces. The amplitude of the vibrations increases with increasing temperature, as the particles gain more thermal energy.
However, the particles in a solid do not have enough energy to break the intermolecular bonds and move freely throughout the entire solid. Instead, they can only move within their local vicinity or lattice positions.
This restricted movement is what distinguishes the solid state from the liquid or gaseous states, where particles have enough energy to overcome intermolecular forces and move more freely.
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A tree burns down and forms ashes
Physical or
Chemical
Answers
Answer:
It is a chemical change.
Explanation:
A tree burning down would be a chemical change because the composition of the tree is what changes, not just the physical characteristics.
which element has the electrons configuration 1s22s22p63s23p64s23d104p2
Answers
The element with the electron configuration 1s22s22p63s23p64s23d104p2 is Silicon (Si).
Explanation:
The electron configuration of an element describes the arrangement of electrons in its atoms. The numbers and letters in the configuration represent the energy levels (n), sublevels (s, p, d, f), and the number of electrons in each sublevel.
In this case, the electron configuration of the element is:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p2
Breaking this down, we can see that the element has:
- 2 electrons in the 1s sublevel
- 2 electrons in the 2s sublevel
- 6 electrons in the 2p sublevel
- 2 electrons in the 3s sublevel
- 6 electrons in the 3p sublevel
- 2 electrons in the 4s sublevel
- 10 electrons in the 3d sublevel
- 2 electrons in the 4p sublevel
Based on the number of electrons in the outermost energy level (valence electrons), we can determine that this element is in group 14 of the periodic table. Looking at the periodic table, we can see that the
Suppose you have 4.0 moles of aqueous barium chloride, and you mix this with aluminum sulfate solution. How many moles of aluminum chloride can you produce?
Answers
Answer:
2.7
Explanation:
The equation of the reaction is
3 BaCl2 + Al2(SO4)3 = 3 BaSO4 + 2 AlCl3
So, frok the coefficients of the equation, the answer is 2.7
2.67 moles of aluminum chloride can be produce if we have 4.0 moles of aqueous barium chloride, and we mix this with aluminum sulfate solution.
The balanced chemical reaction is :
3BaCl₂ + Al₂(SO₄)₃ ---> 3BaSO₄ + 2AlCl₃
When aqueous barium chloride is mixed with aluminum sulfate solution, a double displacement reaction occurs. The barium ions from barium chloride react with the sulfate ions from aluminum sulfate to form insoluble barium sulfate precipitate. At the same time, the aluminum ions from aluminum sulfate react with the chloride ions from barium chloride to form aluminum chloride.
Given :
Number of Moles of BaCl₂ = 4.0 moles
From the balanced chemical reaction,moles of AlCl₃:
= (4.0 moles BaCl₂) (2 moles AlCl₃/3 moles BaCl₂)
= 2.67 moles AlCl₃
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Which of the following pairs of valence electrons is ordered CORRECTLY
in ranking ionization energy?
O p?
O p3
O p5
O p4
Answers
Answer:
p4 is the correct answer
What doesn’t change the resistance of a wire
Answers
The factor that doesn’t change the resistance of a wire is pressure. option A.
What is resistance of a wire?Resistance is a conductor's capacity to thwart the passage of current. It is controlled by the interplay of the applied voltage and the electric current passing through it. The amount of opposition any object applies to the flow of electric current is referred to as resistance.
The ohm, a unit of measurement for resistance, is represented by the Greek letter omega. According to Ohm's law, the voltage across two places is precisely proportional to the current flowing through a conductor between them.
Hence option A is correct.
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missing part;
The pressure
The length of the resistor.
The thickness of the resistor.
The temperature of the conductor.
Ammonia will decompose into nitrogen and hydrogen at high temperature. Calculate the pressure equilibrium constant for the decomposition of ammonia at the final temperature of the mixture
Answers
Answer:
Kp = P (N₂) . P³ (H₂) / P² (NH₃)
Explanation:
The reaction for the decomposition of ammonia is given by;
2NH₃ (g) ⇌ N₂ (g) + 3H₂ (g)
The pressure equilibrium constant gives the ratio of the pressure of the product over reactants for a reaction that is at equilibrium.
The pressures of the species are raised to the powers of their respective coefficients.
In this reaction;
Products = N₂ (g) + 3H₂ (g)
Reactant = 2 NH₃ (g)
The pressure equilibrium constant (Kp) is given as;
Kp = P (N₂) . P³ (H₂) / P² (NH₃)
a 70 piece of metal at 120 C is dropped into a kilometer with 150 g of 30C water the final temperature of the water and little changes 35c what is the specific heat of the metal
Answers
A 70 piece of metal at 120 C is dropped into a kilometer with 150 g of 30C water the final temperature of the water and little changes 35c, 0.385 J/g°c is the specific heat of the metal.
The amount of heat needed to raise a substance's temperature by one degree Celsius in one gramme, also known as specific heat. Typically, calories and joules per gramme per degree Celsius are used as a measure of specific heat.
In the 18th century, the Scottish researcher Joseph Black found that equivalent masses of various substances required varying quantities of heat to bring them across the same temperature range. Based on this finding.
cm = (0.15 kg x 4.18 J/gCx (35C - 30C)) / (70 pieces x 0.1 kg/piece x (120C - 35C))
cm = 0.385 J/g°c
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At which point in its swing does the pendulum have the least gravitational potential energy
Answers
Answer:
a
Explanation:
a
What is the process of photosynthesis
Answers
Answer:
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar
Select the correct answer.
Which phrase correctly describes temperature?
A.
average rotational kinetic energy of the particles in an object
B.
average energy of the particles in an object
C.
average translational kinetic energy of the particles in an object
D.
all energy possessed by the particles in an object
Answers
Answer:
C. average transnational kinetic energy of the particles in an object.
Explanation:
Temperature measures the average kinetic energy of the particles in a substance. Thermal energy measures the total kinetic energy of the particles in a substance. The greater the motion of particles, the higher a substance's temperature and thermal energy. Therefore we could say that the average kinetic energy of a gas particle is directly proportional to the temperature. Hence an increase in temperature increases the speed in which the gas molecules move. All gases at a given temperature have the same average kinetic energy.How is CH4 + 2 O2 ⇒ CO2 + 2 H2O redox reaction? It does not have any pure elements to call it a redox reaction.
Answers
To solve such this we must know the concept of redox reaction. Therefore, the given reaction is redox reaction as one element is getting oxidized and other is getting reduced.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Redox reaction is a chemical reaction where oxidation and reduction takes place simultaneously. Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant.
CH\(_4\) + 2 O\(_2\) \(\rightarrow\) CO\(_2\) + 2 H\(_2\)O
The oxidation state of C in CH\(_4\) is -4 while in CO\(_2\) it is +4. So, carbon is getting oxidized. The oxidation state of oxygen in O\(_2\) is 0 while in H\(_2\)O it is -2, so oxygen is getting reduced. So, this reaction is a redox reaction.
Therefore, the given reaction is redox reaction.
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In the given reaction, carbon oxidizes from 0 oxidation state to +4 state whereas, oxygen reduces from 0 to -2. Hence, one species is oxidized and another species is reduced, thus, it is a redox reaction.
What is redox reaction?A redox reaction a type of reaction in which one species is oxidized and another species is reduced. In oxidation an element forms its higher oxidation state whereas in reduction it reduces to lower oxidation state.
In the given reaction, carbon is in zero oxidation state zero and the it forms +4 oxidation state in CO₂. Similarly, oxygen is in zero charge at its molecular state O₂ which is changed to -2 state in CO₂.
Therefore, both oxidation and reduction takes place in this reaction and it is a redox reaction.
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The enthalpy change for a process is equal to the heat exchanged between system and surroundings under which of the following conditions? a. Constant volume. b. P = Pext = constant (whetre P and Pext are, respectively, the pressure inside and the pressure outside the system) C. Constant temperature d. Reversible expansion e. Expansion at a constant pressure followed by a reversible compression to the original volume.
Answers
Under condition (b), where P=Pext=constant (where P and Pext are, respectively, the pressure inside and outside the system), the enthalpy change for a process is equal to the heat exchanged between the system and surroundings.
What is constant volume in chemistry?In a constant volume calorimeter, the system is sealed or isolated from its surroundings, which accounts for why its volume is fixed and there is no volume-pressure work done. An isochoric process is another name for a constant volume process. An illustration would be the addition of heat to a gas in a container with fixed walls. The gas cannot function because the walls cannot be moved: W = 0.
Is gas a constant volume?He discovered that under constant temperature, the relationship between a gas's pressure and volume is inverse. Boyle's law, which first established in 1662, asserts that the volume and pressure of an ideal gas of a given mass in a closed system are always constant at constant temperature.
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which 2 criteria are the most important of engineers to consider when developing a procsses to produce
Answers
Two key criteria that engineers must prioritize are efficiency and safety. By emphasizing efficiency and safety during process development, engineers can create robust and reliable processes that not only maximize productivity but also prioritize the well-being of personnel and the environment.
When developing a process, engineers need to consider several important criteria. Two key criteria that engineers must prioritize are efficiency and safety.
Efficiency is crucial in process development to ensure optimal use of resources, time, and energy. Engineers strive to design processes that maximize productivity, minimize waste, and reduce costs. This involves optimizing reaction conditions, streamlining workflow, and implementing automation where possible. Efficiency considerations also extend to energy consumption, raw material utilization, and overall process sustainability.
Safety is another critical aspect that engineers must prioritize. They need to identify and mitigate potential hazards associated with the process, ensuring the safety of both personnel and the environment. This involves conducting thorough risk assessments, implementing safety protocols, and designing equipment and systems with safety features. Engineers must also consider the safe handling and storage of materials, as well as potential risks during transportation and disposal.
By emphasizing efficiency and safety during process development, engineers can create robust and reliable processes that not only maximize productivity but also prioritize the well-being of personnel and the environment.
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A student uses a variety of techniques to separate four different compounds from 2.10 g of a mixture. After separation of the
mixture, the student weighs each compound and finds 0.443 g of naphthalene, 0.295 g NaCI, 0.344 g of sand, and 0.688 g
of iron.
Answers
Answer:
\(5y.352.\)
hankkkakk
A photon has a frequency of 8.6 × 10⁸ Hz. What is the energy of this photon?
Answers
Here, the Planck constant is h=(6.626×10−34m2⋅kg/s) h = ( 6.626 × 10 − 34 m 2 ⋅ k g / m 2 ⋅ k g s s ) . Substitute the values in the above equation. Thus the energy associated with one photon is 5.6×10−25J 5.6 × 10 − 25 J .
Hence, the energy of each photon of radio wave having frequency is v=8.6x10^8 Hz is 57.018 x 10 ^-26 j
(look at attached picture)
6. How many moles are in 8.30 x 1023 molecules of CO₂?
a.
b.
C.
d.
1.37
2.8
55.5
100
Answers
____describes a
solution in which the amount of
solute dissolved in a given amount
of solvent is less than
the solubility limit.
A. Soluble
B. Supersaturated
C. Saturated
D. Unsaturated
Answers
When the maximum amount of solute has been dissolved in a given amount of solvent, we say that the solution is saturated.
What is the wavelength of a wave with frequency 1.4 x 1010Hz?
Answers
Answer:
2.143 × 10^-2m
Explanation:
The wavelength, denoted by λ, can be determined using the formula;
λ = v/f
Where; λ = wavelength (m)
v = speed of light (3 × 10^8m/s)
f = frequency
According to the provided information, f = 1.4 x 10^10Hz, v = 3 × 10^8m/s
Hence, λ = v/f
λ = 3 × 10^8/ 1.4 x 10^10
λ = 2.1428 × 10^(8-10)
λ = 2.143 × 10^-2m
Question 4 (1 point)
If the decomposition of (NH4)2(CO3) is a first-order process with a rate constant of
0.196 s-1, how much ammonium carbonate would remain after 39.0 s, starting from
a concentration of 0.957 M?
Your Answer in units:
Answers
The final concentration of the reactant of a first order reaction can be determined from the rate constant equation. The concentration of ammonium carbonate after 39 s will be 0.003 M.
What is rate constant?Rate constant of a reaction is the rate of reaction when one molar concentration of the reactant is involved in the reaction. The expression for the rate constant k for first order reaction is :
k = 1/t ln (C0/Ct)
Where C0 be the initial concentration and Ct be the concentration after t seconds.
Given that C0 of ammonium nitrate = 0.957 M
rate constant = 0.196 /s
t = 39 s.
The concentration after 39 seconds is calculated as follows:
0.196 /s = 1/39s ln (0.957 M / Ct)
Ct = 0.957 / (ln⁻¹ (0.196 × 39))
= 0.003 M.
Therefore, the concentration of ammonium carbonate after 39 seconds will be 0.003 M.
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what is the relationship between temperature and kinetic energy?
Answers
Answer:
Temperature is directly proportional to the kinetic energy of the atoms that a body is made of. This relation is valid concerning the velocities relative to the center of mass of the body. In other words, concerted movements like translation and rotation do not affect temperature.
Explanation:
Answer:
As stated in the kinetic-molecular theory, the temperature of a substance is related to the average kinetic energy of the particles of that substance. When a substance is heated, some of the absorbed energy is stored within the particles, while some of the energy increases the motion of the particles.
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what is the function of eyepiece lens
Answers
Answer:
Eyepiece: The lens the viewer looks through to see the specimen. The eyepiece usually contains a 10X or 15X power lens. Diopter Adjustment: Useful as a means to change focus on one eyepiece so as to correct for any difference in vision between your two eyes.
Explanation:
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Answer:
some of them help with your vision and some help with eye problems like irritated
The mass of an object is reported as 5.20 g +0.05g. 0.05 g indicates the
Answers
Answer:
Atomic number.
Because 2 values given here are 0.05g and one is 5.20g. So there are 2 atoms of one element or compound and one atom of another element or compound.
I am thinking there is an error in or sign. it is supposed to be ± instead of st + as in 5.20 g ± 0.05g.
0.05 g indicates the Measurement of Uncertainty
The mass of an object is reported as 5.20 g ±0.05g.
Here , the Measurement of Uncertainty ±0.05g. explains that Random error always occur when taking measurements reading with any scale.This tells us that the object's correct reading is between 5.15 g and 5.25 g from 5.20 g- 0.05g. and 5.20 g + 0.05g respectively.
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]All organic compounds contain the element carbon but, not all compounds containing the element “carbon”are organic .Justify this statement.
Answers
The statement "All organic compounds contain the element carbon, but not all compounds containing the element 'carbon' are organic" can be justified based on the definition and characteristics of organic compounds.
Organic compounds are compounds primarily composed of carbon and hydrogen atoms, often with other elements like oxygen, nitrogen, sulfur, and phosphorus. These compounds are typically associated with living organisms and are known for their unique properties and behavior, including the ability to form complex structures, exhibit covalent bonding, and undergo organic reactions.
On the other hand, there are compounds that contain carbon but are not classified as organic. One notable example is carbon dioxide (\(CO_{2}\)), which is a simple inorganic compound composed of carbon and oxygen. Carbon dioxide does not possess the characteristic properties of organic compounds, such as the ability to form long chains or undergo organic reactions.
Additionally, there are inorganic compounds like carbonates (such as calcium carbonate) and carbides (such as calcium carbide) that contain carbon but are not considered organic. These compounds have distinct chemical and physical properties different from those of organic compounds.
In summary, while all organic compounds contain carbon, not all compounds containing carbon are organic. The classification of a compound as organic or inorganic depends on its overall molecular structure, bonding, and characteristic properties.
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What does reflection mean?
Answers
Answer:
the throwing back by a body or surface of light, heat, or sound without absorbing it.
"the reflection of light"
Explanation:
i hope this helps
Please help
Make sure to mark the answer as shown “question one= true/false”
Thank you
Answers
Answer:
Please mark me brainliest
Explanation:
The answer is false.
opaque materials do not reflect any light because they absorb or trap all light that comes in contact with them. No light is able to return from within an opaque material or reflect off its inner surface. Opaqueness is defined by a lack of light reflection, transmission or scattering. Light either disappears or is converted into other forms of energy within opaque substances.
Please let me know if this helps explain why opaque materials do not reflect light or if any part of the description is unclear. I can also provide any additional examples or details if needed.
Answer: 19) False. A totally opaque material does not let any light pass through it.