Construct a 95% confidence interval estimate for the average difference in purchases made by female customers compared to male customers, based on the data in Exercise 2 above. Do you expect this confidence interval to contain zero? Why or why not?
In exercise

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Purchases by Females Purchases by Males 30.5 28.73 38.66 44.15 42.98 39.56 36.25 31.49 49.43 29.36 24.65 29.64 17.30 20.34 23.40 3149 28.88 30.77 24.95 23.26 27.66 25.77 33.32 18.29 38.25 25.09 30.51 24.96 26.34