Final answer:
A paired t-test would not be appropriate for comparing depression scores between groups given different medications since these are independent groups requiring a test of two independent means. The correct option is C) Comparing depression scores between groups given different medications
Step-by-step explanation:
It would not be appropriate to use a paired t-test in the situation of 'Comparing depression scores between groups given different medications.'
This is because a paired t-test is designed to compare the means of the same group under two conditions or compare two closely related groups.
In this case, the groups being compared are independent since different medications imply potentially different groups of individuals. Therefore, this situation calls for a test of two independent means rather than a test of matched pairs.
The scenarios of testing marital satisfaction scores before couples therapy, assessing extraversion levels in fraternal twins, and evaluating maze errors after sleep deprivation could all appropriately use paired t-tests, assuming that the pairs consist of the same units under two conditions (before and after therapy, the same twins, and the same participants before and after sleep deprivation, respectively).
The correct option is C) Comparing depression scores between groups given different medications