Question

1. Suppose you want to determine whether women and men experience anxiety differently in response to the dissolution of romantic relationships. You administer Zung’s self-rating anxiety scale to a random sample of 20 men and 20 women who just went through a break-up.

            M                  s                    n

Women:                       35.5        14.66                20

Men:                            49.3     18.50                20

(s represents standard deviation. In order to calculate t value, you need to transfer it back to SS.)

1. What are the null and alternative hypothesis?
2. Find the critical value at α=0.05
3. Calculate your test value.
4. Conclusion.

2. Alcohol affects spatial ability in rats. Researchers have rat run through a maze looking for cheese, first sober, then drunk, and count the number of errors they made.

rat	Sober	Drunk	D(difference)
1	2	4
2	1	4
3	2	4
4	1	3
5	3	5
6	4	6
7	3	5
8	2	4
9	4	5

1. State your hypotheses:
2. Find critical value at α=0.05
3. Calculate t
4. Conclusion.

Answer 1

1.

Hence, there is enough evidence to conclude that  women and men experience anxiety differently in response to the dissolution of romantic relationships at 5% level of significance.

2.

Hence, there is not enough evidence to conclude that  Alcohol affects spatial ability in rats at 5% level of significance.