The Rocky Mountain district sales manager of Rath Publishing Incorporated, a college textbook publishing company, claims that the sales representatives make an average of 38 sales calls per week on professors. Several reps say that this estimate is too low. To investigate, a random sample of 38 sales representatives reveals that the mean number of calls made last week was 40. The standard deviation of the sample is 2.2 calls. Using the 0.10 significance level, can we conclude that the mean number of calls per salesperson per week is more than 38?

Required:

Compute the value of the test statistic.

Note: Round your answer to 3 decimal places.

What is your decision regarding H₀?