Refer to Exercise 8.28.

a. Compare the mean yields of herbicide 1 and herbicide 2 to the control treatment. Use a  .05.

b. Should the procedure you used in part (a) be a one-sided or a two-sided procedure?

c. Interpret your findings in part (a).

Exercise 8.28

The Agricultural Experiment Station of a university tested two different herbicides and their effects on crop yield. From 90 acres set aside for the experiment, the station used herbicide 1 on a random sample of 30 acres and herbicide 2 on a second random sample of 30 acres; they used the remaining 30 acres as a control. At the end of the growing season, the yields (in bushels per acre) were as follows:

a. Use these data to conduct a one-way analysis of variance to test whether there is a difference in the mean yields. Use a  .05.

b. Construct 95% confidence intervals on the mean yields i.

c. Which of the mean yields appear to be different from the control?

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