- When An Opinion Poll Uses Random Digit Dialing To Select Respondents For Polls The Response Rate Is Approximately 10 F 1 (12.58 KiB) Viewed 31 times
- When An Opinion Poll Uses Random Digit Dialing To Select Respondents For Polls The Response Rate Is Approximately 10 F 2 (30 KiB) Viewed 31 times
- When An Opinion Poll Uses Random Digit Dialing To Select Respondents For Polls The Response Rate Is Approximately 10 F 3 (31.72 KiB) Viewed 31 times
A randomly sampled group of patients at a major U.S. regional hospital became part of a nutrition study on dietary habits. Part of the study consisted of a 50-question survey asking about types of foods consumed. Each question was scored on a scale from one: most unhealthy behavior, to five: most healthy behavior. The answers were summed and averaged. The population of interest is the patients at the regional hospital. A prior survey of patients had found the mean score for the population of patients to be p = 2.9. After careful review of these data, the hospital nutritionist decided that patients could benefit from nutrition education. The current survey was implemented after patients were subjected to this education, and it produced these sample statistics for the 15 patients sampled: 1 = 3.3 and s = 1.2. We would like to know if the education improved nutrition behavior. We test the hypotheses Ho : = 2.9 versus H.. > 2.9. The r test to be used has the value: O 1.35. O-1.29. 2.36. 1.29.
A veterinarian wishes to compare the number of times race horses are reported to be lame during a 12-month period, as compared with similar horses that are not raced. The veterinarian is particularly interested in whether the exercise schedule used in racing contributes to lameness, rather than the total amount of exercise. The veterinarian chooses nine race horses and selects, for each race horse, a jumping horse that is the same age, the same breed, and exercised a similar number of hours each weck. The given table contains the observed number of times a horse was lame. Group 2 3 4 5 6 7 8 9 Race 7 8 2 0 3 1 4 2 6 Jump 21 2 7 The veterinarian tests the hypotheses Hu= 0 versus H,:> 0, where is the average difference in number of times race horses are lame minus the number of times jumping horses are lame, 1 3 4 1 3 4 The P-value is: between 0.2 and 0.3. O <0.1. O > 0.3. between 0.1 and 0.2. >