Please check answers. Thanks Each month, the census bureau mails survey forms to
ID: 3234864 • Letter: P
Question
Please check answers. Thanks
Each month, the census bureau mails survey forms to 250,000 households asking questions about the people living in the household and about such things as motor vehicles and housing costs. Telephone calls are made to households that don't return the form. In one month, responses were obtained from 240,000 of the households contacted. If the household does not return the form, and cannot be contacted by telephone, this is: o volunteer bias simple random sampling. undercoverage nonresponse 23. A veterinarian interested in studying the causes of enteroliths, stones that form in the gut of horses, decided to compare the diets of horses with enteroliths and those without that were admitted to the veterinary hospital. This study is an example of a(n): observational study. O survey. experimental study. None of the answer choices is correct. 24. Sickle-cell disease is a painful disorder of the red blood cells that in the United States affects mostly African Americans. To investigate whether the drug hydroxyurea can reduce the pain associated with sickle-cell disease, a study by the NIH gave the drug to 150 sickle-cell sufferers and placebo to another 150. Neither doctors nor patients were told who received the drug. The number of episodes of pain reported by each subject was recorded. This is an example of a(n): paired data experiment. double-blind experiment. observational study. experiment, but not a double-blind experiment.Explanation / Answer
22. nonreponse
23. observational study
24. Double blind experiment.
All the answers are correct.