1. Construct a confidence interval of the population proportion at the given level of confidence. x=120, n=300, 99% confidence
2. A researcher wishes to estimate the proprotion of adults who have high speed internet access. What size sample should be obtained if she wishes to estimate to be within 0.05 with 99% confidence if
a. She uses a previous estimate of 0.58?
b. She does not use any prior estimates?
3. A researcher wishes to estimate the percentage of adults who support aboloishing the penny. What size sample should be obtained if he wishes the estimate to be within 4 percentage points with 95% confidence if
a. He uses a previous estimate of 32%?
b. He does not use any prior estimates?