2.80 Breathing Patterns Research psychologists are interested in finding out whether a person's breathing patterns are affected by a particular experimental treatment. To determine the general respiratory patterns of the n = 30 people in the study, the researchers collected some baseline measurements the total ventilation in litres of air per minute adjusted for body size-for each person before the treatment. The data are shown here, along with some descriptive tools generated by MINITAB and Excel.

a. Summarize the characteristics of the data distribu- tion using the computer output.

b. Does the Empirical Rule provide a good description of the proportion of measurements that fall within two or three standard deviations of the mean? Explain.

c. How large or small does a ventilation measurement have to be before it is considered unusual?

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5.23 4.79 5.83 5.37 4.35 5.92 5.38 6.34 5.12 5.14 4.67 5.77 5.84 6.19 5.58 5.54 6.04 5.48 6.58 4.82 4.72 5.17 4.99 4.51 5.70 5.72 5.16 5.32 4.96 5.63