For each of the following scenarios, indicate whether a one sample t-test, paired t-test, or 2-sample t-test analysis is appropriate.

- A. B. C.	To determine whether ponds carry more water in summer than winter, a biologist measures the average water level in several ponds in a city that year, once in the summer and once in winter.
- A. B. C.	To assess whether barefoot running improves performance, a researcher measures the time to completion of a 5K route for 25 runners, each running once with and once without shoes, with a sufficient recovery period in between.
- A. B. C.	A therapist wanted to compare the stress-relieving effect of yoga versus brisk walking on the treadmill. She enrolled 60 people into the study, and randomized 30 of them into the yoga group and 30 into the treadmill group. Each participant completed a "stress test" before their yoga or treadmill session, and then again completed the "stress test" after the session.
- A. B. C.	There are 30 guests at a party. The hostess wanted to compare two brands of lemonade, so she randomly chose 15 guests to taste brand-A, and gave the other 15 guests brand-B. They each rated the taste from 0-10.
- A. B. C.	You record the number of steps you take every day for 20 days. You want to find out if the average number of steps you take per day differs from the aversage reported in a textbook.

A.	2 sample t-test
B.	One sample t-test
C.	Paired t-test