Assume that the average person in America weighs 150 pounds (μ). You want to determine whether college students weigh less than the average American. Following are the weights collected on a sample of college students: 125, 104, 156, 172, 145, 150, 136, 112, 178, 138. Calculate the 95% confidence interval, write lower bound and upper bound separated by dash, round to one decimal.
Calculate the t-statistics and determine if H0 is rejected or failed to reject.