13.44 An analysis was conducted by the Laboratory for Interdisciplinary Statistical Analysis at Virginia Tech in conjunction with the Department of Forestry.

A certain treatment was applied to a set of tree stumps in which the chemical Garlon was used with the purpose of regenerating the roots of the stumps. A spray was used with four levels of Garlon concentration. After a period of time, the height of the shoots was observed.

Perform a one-factor analysis of variance on the following data. Test to see if the concentration of Garlon has a significant impact on the height of the shoots. Use α = 0.05.

Garlon Level 1 2 3 4 2.87 2.31 3.27 2.66 2.39 1.91 3.05 0.91 3.91 2.04 3.15 2.00 2.89 1.89 2.43 0.01 13.45 In a study that was analyzed for personnel in the Department of Biochemistry at Virginia Tech, three diets were given to groups of rats in order to study the effect of each on dietary residual zinc in the bloodstream.

Five pregnant rats were randomly assigned to each diet group, and each was given the diet on day 22 of pregnancy. The amount of zinc in parts per million was measured. The data are as follows:

1 0.50 0.42 0.65 0.47 0.44 Diet 2 0.42 0.40 0.73 0.47 0.69 3 1.06 0.82 0.72 0.72 0.82 Determine if there is a significant difference in residual dietary zinc among the three diets. Use α = 0.05.

Perform a one-way ANOVA.