Section 1
1)
A random sample of n = 75 scores is selected from a population. Which of the following
distributions will definitely be normal?
(1pts)
Question 1 - A random sample of n = 75 scores is selected from a population. Which of the
following distributions will definitely be normal?
The scores in the sample will form a normal distribution.
The scores in the population will form a normal distribution.
The distribution of sample means will form a normal distribution.
The sample, the population, and the distribution of sample means definitely will not be
normal.
2)
A researcher evaluates a treatment effect using a two-tailed hypothesis test with alpha = .05,
and the decision is to reject the null hypothesis. If the researcher switched to a one-tailed test
using the same sample, what decision would be made?
(1pts)
Question 2 - A researcher evaluates a treatment effect using a two-tailed hypothesis test with
alpha = .05, and the decision is to reject the null hypothesis. If the researcher switched to a one-
tailed test using the same sample, what decision would be made?
Definitely reject the null hypothesis with alpha = .05 and maybe reject with alpha = .01
Definitely reject the null hypothesis with alpha = .05 and with alpha = .01
Definitely fail to reject the null hypothesis with either alpha = .05 or with alpha = .01
It is impossible to predict the outcome of the one-tailed test.
3)
A researcher selects a sample and administers a treatment to the individuals in the sample. If
the sample is used for a hypothesis test, what does the null hypothesis (H0) say about the
treatment?
(1pts)
Question 3 - A researcher selects a sample and administers a treatment to the individuals in the
sample. If the sample is used for a hypothesis test, what does the null hypothesis (H0) say
about the treatment?
The treatment causes a change in the scores.
The treatment adds a constant to each score.
, The treatment multiplies each score by a constant.
The treatment has no effect on the scores.
4)
A sample is selected from a normal population with μ = 75 and σ = 15. Which of the following
samples would be considered extreme and unrepresentative for this population? (M = mean)
(1pts)
Question 4 - A sample is selected from a normal population with μ = 75 and σ = 15. Which of the
following samples would be considered extreme and unrepresentative for this population? (M =
mean)
M = 78 and n= 25
M = 81 and n= 25
M = 70 and n= 9
M = 80 and n= 9
5)
A sample of n = 35 individuals is selected from a population with µ = 90, and a treatment is
administered to the sample. What is expected if the treatment has no effect?
(1pts)
Question 5 - A sample of n = 35 individuals is selected from a population with µ = 90, and a
treatment is administered to the sample. What is expected if the treatment has no effect?
The sample mean should be very different from 90 and should lead you to reject the null
hypothesis.
The sample mean should be very different from 90 and should lead you to fail to reject the
null hypothesis.
The sample mean should be close to 90 and should lead you to reject the null hypothesis.
The sample mean should be close to 90 and should lead you to fail to reject the null
hypothesis.
6)
A sample of n = 9 individuals is selected from a population with μ = 50 and σ =10 , and a
treatment is administered to the sample. After treatment, the sample mean is M = 60. What is
the value of Cohen’s d for this sample?
(1pts)
Question 6 - A sample of n = 9 individuals is selected from a population with μ = 50 and σ =10 ,
and a treatment is administered to the sample. After treatment, the sample mean is M = 60.
What is the value of Cohen’s d for this sample?
1)
A random sample of n = 75 scores is selected from a population. Which of the following
distributions will definitely be normal?
(1pts)
Question 1 - A random sample of n = 75 scores is selected from a population. Which of the
following distributions will definitely be normal?
The scores in the sample will form a normal distribution.
The scores in the population will form a normal distribution.
The distribution of sample means will form a normal distribution.
The sample, the population, and the distribution of sample means definitely will not be
normal.
2)
A researcher evaluates a treatment effect using a two-tailed hypothesis test with alpha = .05,
and the decision is to reject the null hypothesis. If the researcher switched to a one-tailed test
using the same sample, what decision would be made?
(1pts)
Question 2 - A researcher evaluates a treatment effect using a two-tailed hypothesis test with
alpha = .05, and the decision is to reject the null hypothesis. If the researcher switched to a one-
tailed test using the same sample, what decision would be made?
Definitely reject the null hypothesis with alpha = .05 and maybe reject with alpha = .01
Definitely reject the null hypothesis with alpha = .05 and with alpha = .01
Definitely fail to reject the null hypothesis with either alpha = .05 or with alpha = .01
It is impossible to predict the outcome of the one-tailed test.
3)
A researcher selects a sample and administers a treatment to the individuals in the sample. If
the sample is used for a hypothesis test, what does the null hypothesis (H0) say about the
treatment?
(1pts)
Question 3 - A researcher selects a sample and administers a treatment to the individuals in the
sample. If the sample is used for a hypothesis test, what does the null hypothesis (H0) say
about the treatment?
The treatment causes a change in the scores.
The treatment adds a constant to each score.
, The treatment multiplies each score by a constant.
The treatment has no effect on the scores.
4)
A sample is selected from a normal population with μ = 75 and σ = 15. Which of the following
samples would be considered extreme and unrepresentative for this population? (M = mean)
(1pts)
Question 4 - A sample is selected from a normal population with μ = 75 and σ = 15. Which of the
following samples would be considered extreme and unrepresentative for this population? (M =
mean)
M = 78 and n= 25
M = 81 and n= 25
M = 70 and n= 9
M = 80 and n= 9
5)
A sample of n = 35 individuals is selected from a population with µ = 90, and a treatment is
administered to the sample. What is expected if the treatment has no effect?
(1pts)
Question 5 - A sample of n = 35 individuals is selected from a population with µ = 90, and a
treatment is administered to the sample. What is expected if the treatment has no effect?
The sample mean should be very different from 90 and should lead you to reject the null
hypothesis.
The sample mean should be very different from 90 and should lead you to fail to reject the
null hypothesis.
The sample mean should be close to 90 and should lead you to reject the null hypothesis.
The sample mean should be close to 90 and should lead you to fail to reject the null
hypothesis.
6)
A sample of n = 9 individuals is selected from a population with μ = 50 and σ =10 , and a
treatment is administered to the sample. After treatment, the sample mean is M = 60. What is
the value of Cohen’s d for this sample?
(1pts)
Question 6 - A sample of n = 9 individuals is selected from a population with μ = 50 and σ =10 ,
and a treatment is administered to the sample. After treatment, the sample mean is M = 60.
What is the value of Cohen’s d for this sample?
