Refer to Exercise 4.126 and the study of the wear-out failure time of used colored display panels purchased by an outlet store. Recall that prior to acquisition, the panels had been used for about one-third of their expected lifetimes. The failure times (in years) for a sample of 50 used panels are reproduced in the table. An XLSTAT printout of the analysis is shown below.

a. Locate a 95% confidence interval for the true mean failure time of used colored display panels on the printout.

b. Give a practical interpretation of the interval, part a.

c. In repeated sampling of the population of used colored display panels, where a 95% confidence interval for the mean failure time is computed for each sample, what proportion of all the confidence intervals generated will capture the true mean failure time?

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0.01 1.21 1.71 2.30 2.96 0.19 1.22 1.75 2.30 2.98 0.51 1.24 1.77 2.41 3.19 0.57 1.48 1.79 2.44 3.25 0.70 1.54 1.88 2.57 3.31 0.73 1.59 1.90 2.61 1.19 0.75 1.61 1.93 2.62 3.50 0.75 1.61 2.01 2.72 3.50 1.11 1.62 2.16 2.76 3.50 1.16 1.62 2.18 2.84 3.50