Xr12-25 A diet doctor claims that the average North American is more than 20 pounds overweight. To test his claim, a random sample of 20 North Americans was weighed, and the difference between their actual and ideal weights was calculated. The data are listed here. Do these data allow us to infer at the 5% significance level that the doctor’s claim is true?

16 23 18 41 22 18 23 19 22 15 18 35 16 15 17 19 23 15 16 26