A researcher wishes to estimate the number of days it takes an automobile dealer to sell a Montero Sport. A sample of 45 cars had a mean time on the dealer's lot of 53 days. Assume that it follows a normal distribution and the standard deviation is 7 days Find a 95% confidence interval of the dealer's mean selling time: 1. Margin of Error (Round off to 4 decimal places): 2. 95% Confidence Interval (Round off to 2 decimal places): Find an 80% confidence interval of the dealer's mean selling time: 3. Margin of Error (Round off to 4 decimal places): 4.. 80% Confidence Interval (Round off to 2 decimal places): Suppose that a sample of 90 cars had a mean time on the dealer's lot of 54 days. Find a 95% confidence interval of the dealer's mean selling time: 5. Margin of Error (Round off to 4 decimal places): 6.. 95% Confidence Interval (Round off to 2 decimal places)