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  3. 1 which of the following statistical studies is an observational...

Question: 1 which of the following statistical studies is an observational...

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1. Which of the following statistical studies is an observational study? a. A group of students is surveyed to determine the percentage who believe in reincarnation. b. A random sample of students is shown a documentary on the evolution of reincarnation beliefs throughout human history. A second random sample is not shown the documentary. The object of the study is to determine whether viewing the documentary affects belief in reincarnation. c. To determine whether Vitamin C has any effectiveness at lessening the duration of the common cold, one set of cold sufferers is given no Vitamin C, a second set is given 2 grams per day, and a third set is given 5 grams of Vitamin C per day. d. All of these studies are observational. e. None of these studies is observational.
4. Which of the following best summarizes nonresponse bias? a. a tendency for samples to differ from the corresponding population as a result of systematic exclusion of some part of the b. a tendency for samples to differ from the corresponding population because data are not obtained from all individuals selected for inclusion in the sample. c. a tendency for samples to differ from the corresponding population because the method of observation tends to produce values that differ from the true value. d. a bias on the part of the researcher towards those who chose not to participate in a survey e. None of these describes nonresponse bias. population.
2. Select the correct sampling method for the following situation: satisfaction at stores in a certain large city, a grocery store chain selects eight store locations at random and surveys all employees at these locations. a. Simple random sampling b. Stratified random sampling c. Cluster sampling d. Systematic sampling e. Convenience sampling
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