Wk 4 - Zybooks Readings And Assignments [Due Day 7] |11 Questions| With Correct Answers.

4.3.2: Margin of error and sample size for proportions. A poll reported a 36% approval rating for a politician with a margin of error of 1 percentage point. 1) How many voters should be sampled for a 90% confidence interval? Round up to the nearest whole number. 2) How many voters should be sampled for a 95% confidence interval? Round up to the nearest whole number. 3) How many voters should be sampled for a 95% confidence interval if no previous estimate is given? Round up to the nearest whole number. {Ans: 1) 6235 2) 8852 3) 9604}4.1.1: Confidence intervals for population mean. The average amount of time, in minutes, for students to complete a standardized test is normally distributed. A data analyst takes a sample of n=37 student times and finds a 90% confidence interval to be [114.3,147.7]. a) What is the population parameter? b) What is the interpretation of the confidence interval? 2) A clothing retailer is interested in the average waist size of men. A sample is taken with the results given below. a) What is the sample statistic? b) What is the point estimate for the average waist size? c) What is the level of