Question

Is there a difference between the effects of visual contact and auditory contact in long-distance relationships? To answer this question, a family psychologist took a sample of 26 people in long-distance relationships. She asked them to contact their partners primarily via voice call for one week and by video call for a second week; the order of the type of call was randomly assigned for each person. At the end of each week, she asked each subject to rate their satisfaction with their relationship on a scale of 1 to 100.

a) What type of test should this psychologist perform?

Two-sample proportion testTwo-sample t-test    Paired t-test

b) Given that the subjects were randomly assigned, what else would you want to check to ensure that this test is valid?

The sample size is at least 30.The within-subject differences in satisfaction scores are unimodal and symmetric.    The expected satisfaction for each subject is at least 5.The satisfaction scores for each sample are normally distributed.

c) The 95% confidence interval for the average difference goes (0.85, 2.6). What could you say about the p-value?

p-value < .05p-value < .01    p-value ≥ .1p-value ≥ .05

Answer 1

Ans a ) the  type of test should this psychologist perform'

Two-sample t-test

Ans b )

The satisfaction scores for each sample are normally distributed.

Ans c ) The 95% confidence interval for the average difference goes (0.85, 2.6).

p-value ≥ .05