An industry survey of people in sales management positions gave the number of years of experience in sales related positions as shown below. Males Females Sample size 90 80 Mean years 25.7 22.5 Standard deviation years 8.2 3.5 (a) Construct a 95% confidence interval for the difference of population means. (b) Perform a test to determine if the mean number of years for males in sales related positions is more than one year larger than that of females?