Exercise 3.43 shows the percentage errors when 24 college students were asked to estimate how long it took them to read an article. Use these data to estimate a 95 percent confidence interval for the population mean.

Exercise 3.43

Twelve college women and men were asked to read a short article and, when they were finished, estimate how long it took them to read the article. Table 3.6 shows the actual and estimated times (both in seconds) and the percentage difference between the two. Summarize the percentage error data with two side-by-side boxplots, one for women and one for men.

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Women Men Actual Estimated Error (%) Actual Estimated Error (%) 173 150 -13.3 99 155 56.6 125 165 32.0 143 205 43.4 240 360 50.0 94 120 27.7 115 150 30.4 111 420 278.4 150 180 20.0 119 634 432.8 146 330 126.0 143 96 -32.9 124 190 53.2 77 185 140.3 83 104 25.3 111 240 116.2 76 250 228.9 78 125 60.3 121 240 98.3 115 200 73.9 75 58 -22.7 73 120 64.4 83 120 44.6 133 285 114.3