## Question 786:

From her firm’s computer telephone log, an executive found that the mean length of 64 telephonecalls during July was 4.48 minutes with a standard deviation of 5.87 minutes. She vowed to make

an effort to reduce the length of calls. The August phone log showed 48 telephone calls whose

mean was 2.396 minutes with a standard deviation of 2.018 minutes. (a) State the hypotheses for

a right-tailed test. (b) Obtain a test statistic and p-value assuming unequal variances. Interpret

these results using α = .01. (c) Why might the sample data not follow a normal, bell-shaped

curve? If not, how might this affect your conclusions?

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