11.39 Slash Pine Seedings An experiment was conducted to determine the effects of three methods of soil preparation on the first-year growth of slash pine seedlings. Four locations (provincial forest lands) were selected, and each location was divided into three plots. Since it was felt that soil fertility within a location was more homogeneous than between locations, a randomized block design was employed using locations as blocks. The methods of soil prepara- tion were A (no preparation), B (light fertilization), and C (burning). Each soil preparation was randomly applied to a plot within each location. On each plot, the same number of seedlings were planted and the average first-year growth of the seedlings was recorded on each plot. Use the MINITAB printout to answer the questions.

a. Conduct an analysis of variance. Do the data pro- vide evidence to indicate a difference in the mean growths for the three soil preparations?

b. Is there evidence to indicate a difference in mean growths for the four locations?

c. Use Tukey's method for paired comparisons to rank the mean growths for the three soil preparations. Use a = 0.01.

d. Use a 95% confidence interval to estimate the dif- ference in mean growths for methods A and B.

Transcribed Image Text:

Location Soil Preparation 1 2 3 4 ARC B 11 13 16 10 15 17 20 12 10 15 13 10