14.70 [EX14-70] Research about the health practices of cardiovascular technologists compared the body mass index (BMI) of the technologists with that of the general population. Weight classification by BMI is as follows: underweight, less than 19; normal, 19 to 24; overweight, 25 to 29; and obesity, 30 and higher. The following list shows the BMI values for a sample of 30 technologists.

BMI 16 50 39 33 33 25 29 30 39 23 21 24 19 28 26 34 19 20 18 21 24 24 20 18 26 22 24 18 25 25

a. Construct a stem-and-leaf plot for the BMI of the cardiovascular technologists.

b. Describe the sample of technologists as underweight, normal, overweight, or obese.

c. Find the 95% confidence interval for the median body mass index.