Question #1. How do you calculate difference scores in a dependent sample t-test?

Group of answer choices

a. None of the other answers.

b. Subtract one group mean from another, resulting on one difference score for the data set.

c. Subtract the raw scores for each pair of scores, resulting in a new set of difference scores for all the pairs.

d. Subtract one group standard deviation from another, resulting on one difference score for the data set.

Question #2.

Construct confidence intervals from a mean of = 1.25, with a standard error of = 0.45, and df = 10 at the 90%, 95%, and 99% confidence level. Determine if you should reject the null for each.

Group of answer choices

90% [ Choose ] Reject the null or Fail to reject (retain) the null

95% [ Choose ] Reject the null or Fail to reject (retain) the null

99% [ Choose ] Reject the null or Fail to reject (retain) the null

Question #3. What is the null hypothesis for a dependent-samples t-test?

Group of answer choices

a. D 0

b. D = 0

c. D = 100

d. D 100

Question #4.

Administrators at a university want to know if students in different majors are more or less extroverted than others. They provide you with descriptive statistics they have for English majors (coded as 1) and History majors (coded as 2) and ask you to create a 95% confidence interval of the difference between them. Does this confidence interval suggest that the students from the majors differ?

xbar₁= 3.78, xbar₂= 2.23, S₁= 2.60, S₂= 1.15, n₁= 45, n₂= 40

Group of answer choices

a. 95% CI [2.23, 3.78]. There is evidence that these majors differ.

b. 95% CI [0.66, 2.44]. There is evidence that these majors differ.

c. 95% CI [0.66, 2.44]. There is no evidence that these majors differ.

d. 95% CI [2.23, 3.78]. There is no evidence that these majors differ.

Question #5.

Which of the following is a research question that could be tested using an independent samples t-test?

Group of answer choices

a. Do older siblings do more housework than younger siblings?

b. Do college students report higher anxiety than the population in general?

c. None of the other answers.

d. Do those who take a test-prep class do better on the SAT than those who do not?