Question 9 (1 point) A market research company randomly divides 12 stores from a large grocery chain into three groups of four stores each in order to compare the effect on mean sales of three different types of displays. The company uses display type I in four of the stores, display type II in four others, and display type Ill in the remaining four stores. Then it records the amount of sales (in $1,000's) during a one-month period at each of the twelve stores. The table shown below reports the sales information. Display Type I Display Type II Display Type III 98 135 160 127 131 150 135 129 150 115 120 125 By using ANOVA, we wish to test the null hypothesis that the means of the three corresponding populations are equal. The significance level is 1%. Assume that all assumptions to apply ANOVA are true. The degrees of freedom for the numerator of the F distribution are: A/ The degrees of freedom for the denominator of the F distribution are: A/