statistics
posted by Morgan on .
Consider a 90% confidence interval for μ. Assume σ is not known. For which sample size n=10 or n=20, is the confidence interval longer?

Answer is 10, I cannot provide an explanation but it was an answer on one of my assignments.

n a recent study, males used a new weightloss supplement, and all but of them experienced weight loss after two weeks. In the same study, females used the same supplement, and all but of them experienced weight loss after two weeks.
Fill in the blanks of the statement below to make the statement the most reasonable possible.