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Growth of Douglas fir seedlings. An experiment was conducted to compare the growth of Douglas fir...

Growth of Douglas fir seedlings. An experiment was conducted to compare the growth of Douglas fir seedlings under three different levels of vegetation control (0%, 50%, and 100%). Sixteen seedlings were randomized to each level of control. The resulting sample means for stem volume were 58, 73, and 105 cubic centimeters (cm3), respectively, with sp = 17 cm3. The researcher hypothesized that the average growth at 50% control would be less than the average of the 0% and 100% levels. (a) What are the coefficients for testing this contrast? (b) Perform the test and report the test statistic, degrees of freedom, and P-value. Do the data provide evidence to support this hypothesis?

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