1. Anova

7. The following are number of mistakes made on five occasions by word processor operators setting a technical report.

Operator 1	10	13	9	11	12
Operator 2	11	13	8	16	12
Operator 3	10	15	13	11	15
Operator 4	15	7	11	12	9

Perform an analysis of variance and decide at the 0.01 level of significance whether the differences among the four-sample means can be attributed to chance.

1. a. State the null and alternative hypothesis
2. b. Give the p-value
3. c. Give a conclusion for the hypothesis test.

One Proportion

2. The drug Lipitor is meant to reduce total cholesterol and LDL cholesterol.

In clinical trials, 19 out 0f 863 patients taking 10mg of Lipitor daily complained of flulike symptoms. Suppose that it is known that 1.9% of patients taking competing drugs complain of flulike symptoms. Since this is a larger percentage than patients taking Lipitor.

Is there sufficient evidence to conclude that more than 1.9% of Lipitor users experience flulike symptoms as a side effect at the =0.01 level of significance.

1. a. State the null and alternative hypothesis.
2. b. Give the p-value
3. c. Give a conclusion for the hypothesis test
4. d. Find a 99% confidence Interval
5. e. Write a conclusion for the confidence Internal