Question 4 Marketing strategists would like to predict consumer response to new products and their accompanying promotional schemes. Consequently, studies that examine the differences between buyers and nonbuyers of a product are of interest. One study conducted by Shuchman and Riesz (Journal of Marketing Research) was aimed at characterizing the purchasers and non-purchasers of Crest toothpaste. The researchers demonstrated that both the mean household size (number of persons) and mean household income were significantly larger for purchasers than for non-purchasers. A similar study used independent random samples of size 20 and yielded the data shown in the following table on the age of the householder primarily responsible for buying toothpaste.