The administration at a university is interested in studying if any relationship exists between satisfaction at the school and whether the student is a freshman or a senior. The school randomly surveys 10 freshmen and 10 seniors and asks them to rate how satisfied they are at the school on a scale of 1-10, where 10 is extremely satisfied and 1 is extremely dissatisfied. Here is the collected data:

Freshmen Seniors

9 8

7 5

7 8

5 3

8 4

7 9

6 6

7 7

8 7

3 2

1. What is the null hypothesis?

2. What is the research hypothesis (two-tailed t-test)?

3. Calculate t.

4. What are the degrees of freedom?

5. Are the results significant, why or why not?