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Question 786:

From her firmís computer telephone log, an executive found that the mean length of 64 telephone
calls 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?

Need more than just an answer? Download the Easy t Excel T-test Calculator Package which gets you the answer with the detailed calculations.

Need help with the concepts in this question ? View the Comparing Two Means: 2 Sample t-test Tutorial.

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