QUESTIONS You expect that continued increases in the frequency with which customers are targeted with email advertisements will lead to customer frustration and a reduction in sales after a certain point (i.e. an inverted U relationship between Sales and number of email advertisements (#EmailAds)). Model A Sales = a-b* #EmailAds Model B: Sales-a+b* In{#EmailAds) Model C Sales = a +b+ #EmailAds + c* #EmailAds2 Model D: Sales = a +b**EmailAds + CInEmailAds) From the above models, which would be best to use for estimation: O A. Model OB. Model A C. Model OD Model QUESTION 10 The sample median in this data is (6,2,1, 1, 4, 5). A3 O B. 19/6 O 0.4 OD1 QUESTION 11 In order to conduct a chi-square test, I need to have a measure of: O A. The mean of the variables of interest B. The frequency distribution of the variables of interest OC. The variance of the variables of interest OD. The mean and the variance of the variables of interest