Question: 20. Problem 22 in Chapter 10 presented hypothetical data showing that elderly people who own dogs are significantly less likely to pay visits to their

20. Problem 22 in Chapter 10 presented hypothetical data showing that elderly people who own dogs are significantly less likely to pay visits to their doctors than those who do not own pets. The data are presented again here.

Doctor .isits diuring past year Control group Dog owners 12 8 10 5 6 9 9 4 15 6 12 14 23.

a. Make a point estimate of the mean difference for the number of doctor visits between the population of dog owners and the population of non-owners.

b. Make a 90% confidence interval estimate of the mean difference.

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