Question 143142
he Rocky Mountain district sales manager of Rath Publishing, Inc., a college textbook publishing company,
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claims that the sales representatives make an average of 40 sales calls per week on professors.
Ho: u = 40
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Several reps say that this estimate is too low. 
Ha: u > 40
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To investigate, a random sample of 28 sales representatives reveals that the mean number of calls made last week was 42.  The standard deviation of the sample is 2.1 calls.
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test statistic: t(42) = (42-40)/[2.1/sqrt(28)] = 5.0395...
p-value: P(5.0395 < t < 10 with df=27) = 0.00001369...
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Conclusion: Since the p-value is less than 5%, reject Ho.
The average # of calls is greater than 40
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Cheers,
Stan H.



Using the 0.05 significance level, can we conclude that the mean number of calls per salesperson per week is more than 40?