Refer to Exercise 4. Insulation #1 is a standard blown-in insulation. The researchers plan to see whether any of the other insulations differ from this standard. No other contrasts will be tested....

Refer to Exercise 4. Insulation #1 is a standard blown-in insulation. The researchers plan to see whether any of the other insulations differ from this standard. No other contrasts will be tested. Conduct the comparisons, controlling the family-wise significance level at 5%.

Exercise 4

A sample of 24 older homes are randomly divided into four groups and retrofitted with different types of insulation. The response variable is the relative decrease in energy usage. The data is summarized in Table 6.23. Construct the ANOVA table, and draw the appropriate conclusion assuming α = 5%.