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k20 or, equivalently, reject H, if I Mo + 1-1/2$/Vn where t-10/2 is the Student's t value for n - 1 degrees of freedom and the tail probability is a/2. The p-values for these tests are computed in the same way as we did for tests with known variance except that the Student's t value is substituted for the normal Z value. To obtain the p-value we often need to interpolate in the I table or use a computer package. Example 9.4 Analysis of Weekly Sales of Frozen Broccoli (Hypothesis Test) Grand Junction Vegetables is a producer of a wide variety of frozen vegetables. The company president has asked you to determine if the weekly sales of 16-ounce packages of frozen broccoli has increased. The mean weekly number of sales per store has been 2,400 packages over the past 6 months. You have obtained a random sample of sales data from 134 stores for your study. The data are contained in the data file Broccoli