Statistics
posted by Marilyn on .
From her firm’s 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 righttailed test. (b) Obtain a test statistic and pvalue assuming unequal variances. Interpret these results using á = .01. (c) Why might the sample data not follow a normal, bellshaped curve? If not, how might this affect your conclusions?

c) Isn't this a classic Poisson curve, instead of a Bell curve?
http://en.wikipedia.org/wiki/Poisson_distribution
The data never goes negative, it starts from zero