Please help with the 3 following problems.

MAT-1580 Written Assignment 7 Sections 7.1-7.3 1. (3 pts) In a survey of 1002 people, 70% said that they voted in a recent presidential election. Voting records indicate that 61% of eligible voters actually voted. Find 98% confidence interval estimating the proportion of people who say they voted. Are the survey results consistent with the actual voter turnout of 61%. Explain. 2. (4 pts) -5, -32, -13, -9, -19, 49, -30, -23, 14, -21, -32, 11 are the arrival delays of randomly selected American Airlines flights from New York to Loss Angeles. Negative numbers represent flights that arrived before the scheduled arrival time. Use 95% confidence interval. How good is the on-time performance? 158 3. (3 pts) In a study on cholesterol levels a sample of 12 men and women was chosen. The plasma cholesterol levels (mmol/L) of the subjects were as follows: 6.0, 6.4, 7.0, 5.8, 6.0, 5.8, 5.9, 6.7, 6.1, 6.5, 6.3, and 5.8. We assume that these 12 subjects constitute a simple random sample of a population of similar subjects. We wish to estimate the variance of the plasma cholesterol levels with a 95 percent confidence interval. (Assume that the population is normally distributed.)