Construct a confidence interval of the population proportion at the given level of confidence x=120,n=1200,99%. The upper bound of the confidence interval is? Round to the nearest thousandth as needed.
A researchers wishes to estimat the proportion of adults who have high speed internet access. What size sample should be obtain if he wishes the estimate to be within 0.04 with 90% confidence if (a) she uses a previous estimate of 0.34? (b) she does not use any prior estimates?
(a) n=? round to the nearest integer
(b) n=? round to the nearest integer.