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An independent measures t hypothesis test is appropriate when ____

28/03/2021 Client: saad24vbs Deadline: 2 Day

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

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