The Following Summary Quantities Were Computed from an Experiment Involving $\sigma ^ { 2 }$

question 14

Essay

The following summary quantities were computed from an experiment involving four levels of nitrogen (A), two times of planting (B), and two levels of potassium (C). Only one observation (N content, in percentage, of corn grain) was made for each of the 16 combinations of levels.
SSA = .22625 SSB = .000025 SSC = .0036 SSAB = .004325
SSAC = .00065 SSBC = .000625 SST = .2384.
a. Construct the ANOVA table.
b. Assume that there are no three-way interaction effects, so that MSABC is a valid estimate of $\sigma ^ { 2 }$
and test at level .05 for interaction and main effects.
c. The nitrogen averages are $\bar{x}_{100}=1.1200, \bar{x}_{200}=1.3025, \bar{x}_{300}=1.3875 \text {, and } \bar{x}_{400}=1.4300$
Use Tukey's method to examine differences in percentage N among the nitrogen levels $\left( Q _ { .05,4,3 } = 6.82 \right)$

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