Construct a 90% confidence interval for the population mean given the sample data below. 20 Honda Civic owners reported their mpg data. The mpg data follow a normal distribution. The standard deviation for the mpg of all Honda Civics is unknown. Mpg data is { 30, 31, 32, 32, 34, 34, 34, 35, 35, 37, 37, 38, 38, 38, 39, 39, 39, 40, 41, 43 }