Exercise 16 of Chapter 1 presented data on the noise level (dBA) experienced by a sample of 77 individuals working at a particular office.
a. Construct a 95% confidence interval for the true average noise level experienced by people working in this office.
b. Would it be feasible to construct a valid 95% PI for the noise level experienced by a single office worker? Why or why not?

Data From Exercise 16 in Chapter 1

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A sample of 77 individuals working at a particular office was selected and the noise level (dBA) experienced by each one was determined, yielding the following data ("Acceptable Noise Levels for Construction Site Offices," Build. Serv. Engr. Res. Technol. 2009: 87-94). 55.3 55.3 55.3 55.9 55.9 55.9 55.9 56.1 56.1 56.1 56.1 56.1 56.1 56.8 56.8 57.0 57.0 57.0 57.8 57.8 57.8 57.9 57.9 57.9 58.8 58.8 58.8 59.8 59.8 59.8 62.2 62.2 63.8 63.8 63.8 63.9 63.9 63.9 64.7 64.7 64.7 65.1 65.1 65.1 65.3 65.3 65.3 65.3 67.4 67.4 67.4 67.4 68.7 68.7 68.7 68.7 69.0 70.4 70.4 71.2 71.2 71.2 73.0 73.0 73.1 73.1 74.6 74.6 74.6 74.6 79.3 79.3 79.3 79.3 83.0 83.0 83.0 Construct a stem-and-leaf display using repeated stems, and comment on any inter- esting features of the display.