The following Excel output for a = 0.05 summarizes a portion of the results for a randomized block experiment without interaction where factor A (column) represents three income categories (low, medium, high), factor (rows) consists of three different kinds of political parties (Democrat, Republican, Independent), and the variable measured was the amount (in 5) contributed to the political party during the 2008 presidential election.
a. Find the missing values in the ANOVA table.
b. At the 5% significance level, can you conclude that average contributions differ by political party?
c. At the 5% significance level, can you conclude that average contributions differ by income level?