Analysis of variance produces

A hypothesis test produces a t statistic of t = 2.20.  If the researcher is using a two-tailed test with  = .05, how large does the sample have to be in order to reject the null hypothesis?
Select one:
a. At least n = 13
b. At least n = 14
c. At least n = 11
d. At least n = 12
Question 2
A repeated-measures study comparing two treatments with a sample of n = 4 participants produces a mean of M = 18 with SS = 24 for the scores in the first treatment, a mean of M = 14 with SS = 18 for the scores in the second treatment, and a mean of M = 4 with SS = 12 for the difference scores.  What is the estimated standard error for the sample mean difference?
Select one:
a. 3
b. 2
c. 4
d. 1
Question 3
A research report describing the results from a repeated-measures study states: The data show no significant difference between the two treatments, t(10) = 1.65, p > .05.  Based on this report, you can conclude that a total of ____ individuals participated in the research study .
Select one:
a. 9
b. 11
c. 10
d. 12
Question 4
A researcher administers a treatment to a sample of participants selected from a population with µ = 80.  If the researcher obtains a sample mean of M = 88, which combination of factors is most likely to result in rejecting the null hypothesis?
Select one:
a.  = 10 and n = 50
b.  = 10 and n = 25
c.  = 5 and n = 25
d.  = 5 and n = 50
Question 5
A researcher conducts a hypothesis test using a sample of n = 40 from an unknown population.  What is the df value for the t statistic?
Select one:
a. It cannot be determined from the information given.
b. 40
c. 39
d. 41
Question 6
A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population which is known to have a mean of  = 80.  The results will be examined using a one-tailed hypothesis test.  Which of the following is the correct statement of the null hypothesis?
Select one:
a.  < 80
b.  > 80
c.  < 80
d.  > 80
Question 7
A researcher is conducting an experiment to evaluate a treatment that is expected to increase the scores for individuals in a population.  If the researcher uses a one-tailed test with  = .01, then which of the following correctly identifies the critical region?
Select one:
a. z > 2.58
b. z > 2.33
c. z < 2.58
d. z < 2.33
Question 8
A researcher is using a repeated-measures study to evaluate the difference between two treatments.  If the difference between the treatments is consistent from one participant to another, then the data should produce ____.
Select one:
a. a small variance for the difference scores and a small standard error
b. a large variance for the difference scores and a small standard error
c. a small variance for the difference scores and a large standard error
d. a large variance for the difference scores and a large standard error
Question 9
A researcher uses a repeated-measures study to compare two treatment conditions with a set of 20 scores in each treatment.  What would be the value of df for the repeated-measures t statistic?
Select one:
a. df = 19
b. df = 38
c. df = 39
d. df = 18
Question 10
A sample of n = 16 scores produces a t statistic of t = 2.00.  If the sample is used to measure effect size with r2, what value will be obtained for r2?
Select one:
a. r2 = 4/20
b. r2  = 2/20
c. r2 = 4/19
d. r2  = 2/19
Question 11
A sample of n = 25 scores has a mean of M = 40 and a variance of s2 = 100.  What is the estimated standard error for the sample mean?
Select one:
a. 1
b. 2
c. 4
d.
Question 12
A sample of n = 4 scores is selected from a population with an unknown mean.  The sample has a mean of M = 40 and a variance of s2 = 16.  Which of the following is the correct 90% confidence interval for ?
Select one:
a.  = 40 ± 2.353(2)
b.  = 40 ± 1.638(2)
c.  = 40 ± 2.353(4)
d.  = 40 ± 1.638(4)
Question 13
A treatment is administered to a sample of n = 9 individuals selected from a population with a mean of  = 80 and a standard deviation of  = 12.  After treatment, the effect size is measured by computing Cohen’s d, and a value of d = 0.50 is obtained.  Based on this information, what is the mean for the treated sample?
Select one:
a. M = 82
b. M = 86
c. M = 6
d. This cannot be answered without knowing the sample size.
Question 14
An analysis of variance produces SSbetween = 30, SSwithin = 60, and an F-ratio with df = 2, 15.  For this analysis, what is the F-ratio?
Select one:
a. 15/4 = 3.75
b. 30/60 = 0.50
c. 60/30 = 2.00
d. 4/15 = 0.27
Question 15
An analysis of variances produces dftotal = 29 and dfwithin = 27.  For this analysis, what is dfbetween?
Select one:
a. This cannot be determined without additional information.
b. 1
c. 3
d. 2
Question 16
An independent-measures study comparing two treatment conditions produces a t statistic with df = 18.  If the two samples are the same size, how many participants were in each of the samples?
Select one:
a. 19
b. 10
c. 9
d. 20
Question 17
An independent-measures study has one sample with n = 10 and a second sample with n = 15 to compare two experimental treatments.  What is the df value for the t statistic for this study?
Select one:
a. 23
b. 26
c. 27
d. 24
Question 18