3. We treat the repeated sample case differently from the case involving two separate samples because of a. the difference in the means of the two samples. b. the fact that different subjects were involved. c. the correlation between the two sets of data. d. the size of the sample. 4. We are evaluating a method of therapy for extremely underweight adolescent girls. If we weighed our subjects at the beginning and end of therapy, a difference in weight could mean a. that our therapy worked. b. that people gain weight over time regardless of what we do. c. that our scales changed due to repeated use. d. all of the above 5. A repeated-measures study and an independent-measures study both produced a t statistic with df = 10. How many individuals participated in each study? a. 12 for repeated-measures and 11 for independent-measures b. 12 for repeated-measures and 12 for independent-measures c. 11 for repeated-measures and 11 for independent-measures d. 11 for repeated-measures and 12 for independent-measures