Chapter 8, Problem 8.104ACB

Is steak your favorite barbeque food? July is National Grilling Month in the United States. On July 1, 2008, The Harris Poll #70 reported on a survey of Americans’ grilling preferences. When asked about their favorite food prepared on a barbeque, 662 of 1,250 randomly sampled Democrats preferred steak, as compared to 586 of 930 randomly sampled Republicans.

1. a. Give a point estimate for the proportion of all Democrats who prefer steak as their favorite barbeque food.
2. b. Give a point estimate for the proportion of all Republicans Who prefer steak as their favorite barbeque food.
3. c. Give a point estimate for the difference between the proportions of all Democrats and all Republicans who prefer steak as their favorite barbeque food.
4. d. Construct a 95% confidence inter/al for the difference between the proportions of all Democrats and all Republicans who prefer steak as their favorite barbeque food.
5. e. Give a practical interpretation of the interval, part d.
6. f. Explain the meaning of the phrase 95% confident in your answer to part e.