A large laboratory has four types of devices used to determine the pH of soil samples. The
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a. Based on your intuition, is there evidence to indicate any difference among the mean differences in pH readings for the four devices?
b. Run an analysis of variance to confirm or reject your conclusion in part (a). Use α = .05.
c. Compute the p-value of the F test in part (b).
d. What conditions must be satisfied for your analysis in parts (b) and (c) to be valid?
e. Suppose the 24 soil samples have widely different pH values. What problems may occur by simply randomly assigning the soil samples to the different devices?
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Related Book For
An Introduction To Statistical Methods And Data Analysis
ISBN: 9781305465527
7th Edition
Authors: R. Lyman Ott, Micheal T. Longnecker
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