Which inference procedure is most appropriate for the following scenarios? Each choice may be used more than once.

a. Single Proportion b. Difference in Proportions c. Single Mean d. Paired Means e. Difference in Means

### Questions 10 - 19

10. Do women order dessert more often than men? 85 men and 73 women at a restaurant were observed to see if they ordered dessert. 11. Do customers at Walmart wait in the checkout line on average longer than 5 minutes? 150 randomly selected Walmart customers were observed and their wait times were recorded. 12. When road conditions are snowy, do people who have four wheel drive vehicles drive faster than those who have two wheel drive vehicles? 45 four wheel drive vehicles and 40 two wheel drive vehicles were clocked. 13. Suppose that in a simple random sample of 350 Americans, that 180 say they believe there is life in outer space. Do a majority of Americans believe there is life in outer space? 14. To determine if dentists make people more nervous than a general doctor, the blood pressure of 25 subjects were measured in a dental setting and in an unrelated medical setting. 15. Last year honeybees weighed 0.87 grams on average. Are this year's bees significantly heavier? 50 bees were captured and weighed. 16. Do people with high fiber diets have higher vitamin D levels? Vitamin D levels are recorded for random samples of 43 people with high fiber diets and 47 people with regular diets. 17. Will plants grow larger in artificially fertilized soil than in organic soil? 55 plants were grown in organic soil and 55 plants in artificially fertilized soil. 18. Does a new technique to test body fat percentage in athletes provide estimates similar to the older, more expensive technique? 50 athletes were recruited and had their body fat measured measured with both techniques. 19. Is the recovery time from ACL surgery shorter for patients who have health insurance? 300 patients with health insurance and 200 patients without health insurance were studied for their recovery time after the ACL surgery.