Growth of Douglas fir seedlings. An experiment was
Chapter , Problem 12.8(choose chapter or problem)
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%). Twenty seedlings were randomized to each level of control. The resulting sample means for stem volume were 53, 76, and 110 cubic centimeters (cm3 ), respectively, with sp 28 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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