Bong Soon owns a tire shop and wants to compare the longevity of four different brands of tires that he sells in his shop. He collected 20 observations and measured the mileage (in miles) covered by the cars using each brand. From the data, he determined that the sum of squares of mileages covered between the four brands is 384.4 and the sum of squares of mileages covered within brands is 318.6.
a. Prepare the complete analysis of variance table.
b. Test the null hypothesis of equality of the four brands at 1% significance level.