1. Assume that a sample is used to estimate a population proportion p. Find the 99.5% confidence interval for a sample of size 116 with 89% successes. Enter your answer as an open-interval (i.e., parentheses) using decimals (not precents) accurate to three decimal places.
C.I. =
2. Find the margin of error and 95% confidence interval for the following surveys. Round all answers to 2 decimal places.
(a) A survey of 500 people finds that 64% plan to vote for Smith for governor.
Margin of Error (as a percentage):
Confidence Interval:
% to
%
(b) A survey of 1500 people finds that 43% support stricter penalties for child abuse.
Margin of Error (as a percentage):
Confidence Interval:
% to
%
