We Want to Know Whether People Are Likely to Offer

Essay

We want to know whether people are likely to offer a different amount for used
exercising equipment when buying from a friend than when buying from a stranger. We
wonder whether the difference between mean amounts is zero. We have bid prices from 8
subjects buying from a friend and 7 subjects buying from a stranger, found in a
randomized experiment.
A. What assumptions can we make?
b. What type of test can we perform?