1)A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.03 with 90% confidence if

(a) she uses a previous estimate of 0.56?

(b) she does not use any prior estimates?

2)In a poll, 69% of the people polled answered yes to the question "Are you in favor of the death penalty for a person convicted of murder?" The margin of error in the poll was 3% and the estimate was made with 95% confidence. At least how many people were surveyed?

The minimum number of surveyed people was _ (round to the nearest integer)

3)Construct a confidence interval of the population proportion at the given level of confidence. x=40, n=200, 90% confidence

The lower bound is _

The upper bound is _

4)Construct a confidence interval of the population proportion at the given level of confidence.

x=540, n=1100, 90% confidence

The lower bound of the confidence interval is _