Section 1
1)
A hypothesis test with a sample of n = 25 participants produces a t statistic of t = +1.83.
Assuming a one-tailed test with the critical region in the right-hand tail, what is the correct
decision?
(1pts)
Question 1 - A hypothesis test with a sample of n = 25 participants produces a t statistic of t =
+1.83. Assuming a one-tailed test with the critical region in the right-hand tail, what is the
correct decision?
The researcher can reject the null hypothesis with α = .05 but not with α = .01.
The researcher can reject the null hypothesis with either α = .05 or α = .01.
The researcher must fail to reject the null hypothesis with either α = .05 or α = .01.
It is impossible to make a decision about Null Hypothesis without more information.
2)
A researcher conducts an experiment of a sample of A sample of n = 25 scores has a mean of M
= 64 and an estimated standard error of 2 points. What is the sample variance?
(1pts)
Question 2 - A researcher conducts an experiment of a sample of A sample of n = 25 scores has
a mean of M = 64 and an estimated standard error of 2 points. What is the sample variance?
2
5
10
100
3)
A researcher reports t(12) = 5.30, p < .01 for an independent-measures experiment. How many
individuals participated in the entire experiment?
(1pts)
Question 3 - A researcher reports t(12) = 5.30, p < .01 for an independent-measures
experiment. How many individuals participated in the entire experiment?
10
12
14
, 16
4)
A sample is selected from a population with mean of 32, and a treatment is administered to the
sample. After treatment, the sample mean is M = 38, and Cohen’s d is d = 2.00. What is the
value of the sample variance?
(1pts)
Question 4 - A sample is selected from a population with mean of 32, and a treatment is
administered to the sample. After treatment, the sample mean is M = 38, and Cohen’s d is d =
2.00. What is the value of the sample variance?
6
9
12
It is impossible to determine the sample variance without more information.
5)
An independent-measures research study uses two samples, each with n = 10 participants. If
the data produce a t statistic of t = 2.195, which of the following is the correct decision for a
two-tailed hypothesis test?
(1pts)
Question 5 - An independent-measures research study uses two samples, each with n = 10
participants. If the data produce a t statistic of t = 2.195, which of the following is the correct
decision for a two-tailed hypothesis test?
Reject the null hypothesis with alpha = .05 but fail to reject with alpha = .01
Reject the null hypothesis with either alpha = .05 or alpha = .01
Fail to reject the null hypothesis with either alpha = .05 or alpha = .01
Cannot answer without additional information
6)
An independent-measures study has one sample with n = 16 and a second sample with n = 14
to compare two experimental treatments. What is the df value for the t statistic for this study?
(1pts)
Question 6 - An independent-measures study has one sample with n = 16 and a second sample
with n = 14 to compare two experimental treatments. What is the df value for the t statistic for
this study?
28
1)
A hypothesis test with a sample of n = 25 participants produces a t statistic of t = +1.83.
Assuming a one-tailed test with the critical region in the right-hand tail, what is the correct
decision?
(1pts)
Question 1 - A hypothesis test with a sample of n = 25 participants produces a t statistic of t =
+1.83. Assuming a one-tailed test with the critical region in the right-hand tail, what is the
correct decision?
The researcher can reject the null hypothesis with α = .05 but not with α = .01.
The researcher can reject the null hypothesis with either α = .05 or α = .01.
The researcher must fail to reject the null hypothesis with either α = .05 or α = .01.
It is impossible to make a decision about Null Hypothesis without more information.
2)
A researcher conducts an experiment of a sample of A sample of n = 25 scores has a mean of M
= 64 and an estimated standard error of 2 points. What is the sample variance?
(1pts)
Question 2 - A researcher conducts an experiment of a sample of A sample of n = 25 scores has
a mean of M = 64 and an estimated standard error of 2 points. What is the sample variance?
2
5
10
100
3)
A researcher reports t(12) = 5.30, p < .01 for an independent-measures experiment. How many
individuals participated in the entire experiment?
(1pts)
Question 3 - A researcher reports t(12) = 5.30, p < .01 for an independent-measures
experiment. How many individuals participated in the entire experiment?
10
12
14
, 16
4)
A sample is selected from a population with mean of 32, and a treatment is administered to the
sample. After treatment, the sample mean is M = 38, and Cohen’s d is d = 2.00. What is the
value of the sample variance?
(1pts)
Question 4 - A sample is selected from a population with mean of 32, and a treatment is
administered to the sample. After treatment, the sample mean is M = 38, and Cohen’s d is d =
2.00. What is the value of the sample variance?
6
9
12
It is impossible to determine the sample variance without more information.
5)
An independent-measures research study uses two samples, each with n = 10 participants. If
the data produce a t statistic of t = 2.195, which of the following is the correct decision for a
two-tailed hypothesis test?
(1pts)
Question 5 - An independent-measures research study uses two samples, each with n = 10
participants. If the data produce a t statistic of t = 2.195, which of the following is the correct
decision for a two-tailed hypothesis test?
Reject the null hypothesis with alpha = .05 but fail to reject with alpha = .01
Reject the null hypothesis with either alpha = .05 or alpha = .01
Fail to reject the null hypothesis with either alpha = .05 or alpha = .01
Cannot answer without additional information
6)
An independent-measures study has one sample with n = 16 and a second sample with n = 14
to compare two experimental treatments. What is the df value for the t statistic for this study?
(1pts)
Question 6 - An independent-measures study has one sample with n = 16 and a second sample
with n = 14 to compare two experimental treatments. What is the df value for the t statistic for
this study?
28
