The table summarizes the results of a study of people in the United States who play tennis regularly. Each survey represents a simple random sample.
http://oi47.tinypic.com/2j1tt05.jpg
a. Construct a 99% confidence interval for the difference between the percent of all tennis players under the age of 18 and all tennis players in the 18- to 34-year-old age group who play tennis regularly.
(0.2, 28)
(8.7, 19.5)
(1.9, 29.7)
(5.2, 23)
b. If the Under 18 age group is Group 2, what are the values of zcrit, ^p2, and n2 for a 95% confidence interval?
zcrit= 1.64, ^p2 = 22.9%, n2=83
zcrit = 1.96, ^p2 = 19%, n2 = 83
zcrit = 1.96, ^p2 = 19%, n2 = 102
zcrit = 1.96, ^p2 = 22.9%, n2 = 83
**(the ^ sign is goes on top of the p)**