1)Express the confidence interval

72.3% 4.6 %

in interval form.

Express the answer in decimal format (do not enter as percents).

2)We wish to estimate what percent of adult residents in a certain county are parents. Out of 600 adult residents sampled, 210 had kids. Based on this, construct a 99% confidence interval for the proportion, p, of adult residents who are parents in this county.

Give your answers as decimals, to three places.

__________

3)We wish to estimate what percent of adult residents in a certain county are parents. Out of 600 adult residents sampled, 210 had kids. Based on this, construct a 99% confidence interval for the proportion, p, of adult residents who are parents in this county.

Give your answers as decimals, to three places.

4)Giving a test to a group of students, the grades and gender are summarized below

	A	B	C	Total
Male	14	7	11	32
Female	2	17	9	28
Total	16	24	20	60

Let represent the percentage of all female students who would receive a grade of A on this test. Use a 80% confidence interval to estimate p to three decimal places.

Enter your answer as a tri-linear inequality using decimals (not percents).

_______ < p <______

5)A political candidate has asked you to conduct a poll to determine what percentage of people support her.

If the candidate only wants a 3% margin of error at a 95% confidence level, what size of sample is needed?

Give your answer in whole people.