1) Based on the results, construct a 95% confidence interval estimate of the percentage of all such pages that have advertising (41%). Show all steps for creating your interval.
2) Explain the meaning of this confidence interval in the context of the assignment using easy to understand language.
3) If we wanted to create a 90% interval with a margin of error of 2 percent, using the standard deviation from the sample, find the sample size necessary to do so.