10. Breathing Patterns Research psychologists measured the baseline breathing patterns—the total ventilation (in liters of air per minute)

adjusted for body size—for each of n530 patients, so that they could estimate the average total ventilation for patients before any experimentation was done. The data, along with some MINITAB output, are presented here:

a. What information does the stem and leaf plot give you about the data? Why is this important?

b. Use the output to construct a 99% confidence interval for the average total ventilation for patients.

5.23 5.72 5.77 4.99 5.12 4.82 5.54 4.79 5.16 5.84 4.51 5.14 5.92 6.04 5.83 5.32 6.19 5.70 4.72 5.38 5.48 5.37 4.96 5.58 4.67 5.17 6.34 6.58 4.35 5.63 Stem-and-leaf of Ltrs/min N = 30 1 2 44 4 3 4 5 5 4 677 8 4 899 12 5 1111 (4) 5 2333 14 5 455 11 5 6777 7 5 889 46 01 26 3 16 5 Leaf Unit = 0.1