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Unformatted text preview: Exam 1 Practice Questions 1-4 are based on the following description A team of researchers wished to study whether oatmeal reduced bad cholesterol levels in those who ate it. They found 500 adults over age 40 who regularly eat oatmeal or products from oatmeal. They then matched each of these 500 with a similar adult (one of the same gender, within 10 pounds of the same weight, and who exercised roughly the same amount) who did not regularly eat oatmeal or products made from oatmeal. Finally, they measured the bad cholesterol LDL for each adult and compared both groups. 1) This is NOT an experiment because: A) It did not use a random sample of subjects B) It used matched pairs C) It was not at least single-blind D) The researcher did not assign the adults to regularly eat oatmeal or not E) The researcher did not use a random sample 2) The individuals in this observational study were: A) The 500 non-oatmeal eaters B) The 500 who regularly ate oatmeal C) The combined 500 oatmeal eaters and 500 non-oatmeal eaters D) The researchers E) Eating oatmeal and not eating oat-meal 3) The matching was good because it: A) Avoided undercoverage B) Helped reduce the number of processing errors C) Increased the variability of the estimated difference due to oatmeal D) Removed confounding with gender, weight, and exercise E) Removed the placebo effect 4) This study can’t give evidence that oatmeal causes a decrease in LDL levels of those in our sample because: A) It did not use a random sample of subjects B) It used matched pairs. C) The researcher did not assign the adults to regularly eat oatmeal or not D) The researcher did not use a random sample E) The sample size wasn’t large enough Questions 5-14 are based on the following description A recent poll in Indiana was conducted to see what percentage of all likely voters for the state’s upcoming presidential primary election would favor moving the primary from May to January. A sample of size 800 was chosen by using the list of all living voters who had voted in at least two of the last three presidential primary elections. The sample was chosen by numbering everyone who was on the list and then selecting 800 of those numbers at random using a computer program like we saw in class. 488 of the 800 contacted by phone favored moving the Indiana primary from May to January, and 312 were not in favor of moving the primary. 5) This is an example of a: A) Cluster Sample B) Multistage Sample C) Simple Random Sample D) Stratified Random Sample E) Systematic Sample 6) The sampling frame in this example is: A) Likely primary election voters in the state B) The 488 people who answer that they would favor moving the primary C) The 800 people who responded to the survey D) The computer program used to select the random numbers E) The list of all those who voted in two of the last three presidential primary elections 7) The target population in this example is: A) Likely primary election voters in the state B) The 488 people who answer that they would favor moving the primary...
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- Spring '07
- Statistics, Randomness, United States presidential primary, Presidential primary elections