A researcher claims that a post-lunch nap decreases the amount of time it takes

A researcher claims that a post-lunch nap decreases the amount of time it takes to run 20 meters. Ten subjects are randomly selected. The data below list the amounts of time (in seconds) it took the ten subjects to run 20 meters without and with a post-lunch nap. In each data vector, the data are presented in order by subject. Without a nap: 4.07, 3.94, 3.92, 3.97, 3.92, 3.96, 4.07, 3.93, 3.99, 4.02
With a nap: 3.93, 3.87, 3.85, 3.92, 3.90, 3.85, 3.92, 3.80, 3.89, 3.89

Required:
a. Identify the claim and state.
b. What is the​ claim?

1. A night with only 4 hours of sleep decreases the amount of time it takes males to sprint 20 meters.
2. A night with only 4 hours of sleep increases the amount of time it takes males to sprint 20 meters.
3. A​ post-lunch nap increases the amount of time it takes males to sprint 20 meters.
4. A​ post-lunch nap decreases the amount of time it takes males to sprint 20 meters.