Company officials are concerned about the length of time a particular drug retains its potency. A random sample (sample 1) of 10 bottles of the product is drawn from current production and analyzed for potency. A second sample (sample 2) is obtained, stored for 1 year, and then analyzed. The readings obtained are as follows:

a. What is the research hypothesis?
b. Compute the values of the t and t9 statistics? Why are they equal for this data set?
c. What are the p-values for the t and t9 statistics? Why are they different?
d. Are the conclusions concerning the research hypothesis the same for the two tests if we use α = .05?
e. Which test, t or t', is more appropriate for this data set?

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Saple 10 105 10.3 108 9.8 106 10.7 10.2 100 10.6 Sample 2 9.89.6 101 102 10 9.7 95 9.6 9.8 9.9