A partially completed ANOVA table for a completely randomized design is shown here:

a. Complete the ANOVA table.
b. How many treatments are involved in the experiment?
c. Do the data provide sufficient evidence to indicate a difference among the population means? Test, using α = .10.
d. Find the approximate observed significance level for the test in part c, and interpret it.

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Source df SS MS F 18.4 Treatments Error Total 41 45.2