A simple random sample of size n is drawn. The sample mean is found to be 18.4 , and the sample standard deviation is found to be 4.5.

a. Construct a 95% confidence interval about u( that funky u) if the sample size is 35.

b. Construct a 95% confidence interval about u( that funky u) if the sample size is 50.

c. Compare your results from Parts (a) and (b). How does increasing the sample size affect the margin of error?

1. For a simple rendom sample of 40 Honda Accords (4 cylinder, 2.4 liter, 5-speed automatic), the mean gas mileage was 23 miles per gallon with a standard deviation of 1.5 miles per gallon. Construct a 95% confidence interval for the gas mileage of similiar 2005 HOnda Accords.