9.20 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...


9.20


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:


Herbicide 1









































81.281.179.984.680.474.481.790.1102.489.2
92.091.775.995.176.183.088.080.573.680.4
103.285.973.680.082.479.599.896.681.394.7

Herbicide 2









































94.890.985.283.395.585.487.189.683.788.7
91.485.489.092.485.091.089.2100.988.590.3
87.680.790.0101.092.197.992.588.889.4100.1

Control









































94.779.591.482.696.985.480.890.688.680.8
78.182.593.583.190.589.282.084.190.184.5
81.292.490.582.0106.696.976.1101.877.588.8

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 procecedures?


c. Interpret your findings in part (a).



Jun 01, 2022
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