In general, an increase in the sample size in a repeated-measures study will cause ______.

• A.an increase in the standard error and an increase in the value of t
• B.an increase in the standard error and a decrease in the value of t
• C.a decrease in the standard error and an increase in the value of t
• D.a decrease in the standard error and a decrease in the value of t

Reset Selection

Question 2 of 10 1.0 Points With = .05 and a sample of n = 15 participants in a repeated-measures study comparing two treatments, what are the t statistic boundaries for the two-tailed critical region?

• A.t = 2.145
• B.t = 1.761
• C.t = 1.746
• D.t = 2.120

Reset Selection

Question 3 of 10 1.0 Points A researcher reports t(12) = 2.86, p < .05 for a repeated-measures research study. How many individuals participated in the study?

• A.n = 11
• B.n = 13
• C.n = 24
• D.n = 25

Reset Selection

Question 4 of 10 1.0 Points Which of the following studies uses a matched-subjects design?

• A.A group of twins is tested for visual acuity on one day and then tested again the following day after receiving a drug.
• B.A sample of children is tested for vocabulary skills at age six and then again at age ten.
• C.Participants are assigned to one of two treatment groups so that each participant in one group has the same IQ as a participant in the other group.
• D.None of the other options is a matched-subjects design.

Reset Selection

Question 5 of 10 1.0 Points In general, if the variance of the difference scores increases, then the value of the t statistic will ______.

• A.increase (move farther toward the tail of the distribution).
• B.decrease (move toward 0 at the center of the distribution).
• C.stay the same - the t statistic is not affected by the variance of the difference scores.
• D.may increase or may decrease. There is no consistent relationship between variance and the size of the t statistic.

Reset Selection

Part 2 of 2 - part 2

Question 6 of 10 1.0 Points If a sample consists of n = 15 individuals, then what is the df value for the t statistic?

• A.16
• B.15
• C.14
• D.cannot be determined from the information given

Reset Selection

Question 7 of 10 1.0 Points A sample of n = 9 scores has SS = 72. What is the estimated standard error for the sample mean?

• A.9
• B.3
• C.1
• D.cannot answer without knowing the sample mean

Reset Selection

Question 8 of 10 1.0 Points What is the effect of a large value for the estimated standard error.

• A.a larger value for t and a greater likelihood of rejecting the null hypothesis
• B.a larger value for t and a lower likelihood of rejecting the null hypothesis
• C.a smaller value for t and a greater likelihood of rejecting the null hypothesis
• D.a smaller value for t and a lower likelihood of rejecting the null hypothesis

Reset Selection

Question 9 of 10 1.0 Points A sample is selected from a population with = 80, and a treatment is administered to the sample. If the sample variance is s2 = 20, which set of sample characteristics is most likely to lead to a decision that there is a significant treatment effect (reject H0)?

• A.M = 85 for a sample of n = 25
• B.M = 85 for a sample of n = 100
• C.M = 90 for a sample of n = 25
• D.M = 90 for a sample of n = 100

Reset Selection

Question 10 of 10 1.0 Points The estimated standard error, provides a measure of the average or standard distance between ______.

• A.a score and the population mean (X and )
• B.a sample mean and the population mean (M and )
• C.a score and the sample mean (X and M)
• D.None of the other options is correct.

Reset Selection