Enter the values of the sample size, the point estimate of the population proportion, and the critical value you need for your confidence interval. (Choose the correct critical value from the table of critical values provided.) When you are done, select "Compute".

There is a popular lottery in which a ticket is called a scratcher. You are an auditor and want to estimate the population proportion of all winning scratchers, so you select a random sample of 80 scratchers. Follow the steps below to construct a 99% confidence interval for the population proportion of all winning scratchers. (If necessary, consult a list of formulas.) (a) Click on "Take Sample" to see the results from the random sample. Number Proportion Winning scratcher Losing scratcher Enter the values of the sample size, the point estimate of the population proportion, and the critical value you need for your 99% confidence interval. (Choose the correct critical value from the table of critical values provided.) When you are done, select "Compute". Sample e 0 Standard error: \\ ) Point estimate: O Margin of error: - Confidence level Critical value Critical value: O 999/, Zo00s = 2376 99% confidence interval: 9504 Zp00s = 1.960