19. Refer to Exercise 18. The following are the weights (kg) and heights (cm) of the 14 subjects in the sample studied by Roberts et al. (A-14):

Weight: 83.9 99.0 63.8 71.3 65.3 79.6 70.3 69.2 56.4 66.2 88.7 59.7 64.6 78.8 Height: 185 180 173 168 175 183 184 174 164 169 205 161 177 174 SouacE: Susan B. Roberts, Melvin B. Heyman, William J. Evans, Paul Fuss, Rita Tsay, and Vernon R. Young, "Dietary Energy Requirements of Young Adult Men, Determined by Using the Doubly Labeled Water Method," American Journal of Clinical Nutrition, 54 (1991), 499-505.

a. For each variable, compute the mean, median, variance, standard deviation, and coefficient of variation.

b. For each variable, construct a stem-and-leaf display and a box-and-whisker plot.

c. Which set of measurements is more variable, weight or height? On what do you base your answer?