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We observed that the mean hours spent on email per staff is 4.464. At least half of the staff will
spent 4.4 hours on email while most of the staff will spent 4.7 hours or 5.3 hours. The median
amount spent on email is higher for Executives.
If we select sample of 26 executives and 27 managers, and for each sample we compute
the mean and then construct a 95 percent confidence interval, we could expect about 95
percent of these confidence interval with the mean of 4.464 within the range.
The null hypothesis is that the managers have the same or higher usage on the daily email
as compared to the executives which had been classifies as H0. The alternative
hypothesis is that the managers have lower usage on daily email which had been
classified as H1.
We also conducted a pooled ttest to determine whether the daily email usage of the
managers is significantly lower than the executives. The computed value of t (7.633) is
higher than the critical value of 1.675, therefore H0
is rejected. The hypothesis and
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 Spring '11
 M
 Physics

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