Lipton, a company primarily known for tea, considered using coupons to stimulate sales of its packaged dinner entrees. The company was particularly interested whether there was a diffences in the effect of coupons on singles versus married couples. A poll of consumers asked them to respond to the question €œDo you use coupons regularly?€ by a numerical scale, where 1 stands for agree strongly, 2 for agree, 3 for neutral, 4 for disagree, and 5 for disagree strongly. The results of the poll are given in the following table (19).

Is the observed difference significant at the α = 0.05 level?

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Use Coupons Regularly Single (X) Married (Y) 57 T-3.10 2.43 sx 1.469 s1350