Reference no: EM137686
1. A simple random sample of 1000 Americans found that 61% were satisfied with the service provided by the dealer from which they bought their car. A simple random sample of 1000 Canadians found that 58% were satisfied with the service provided by the dealer from which they bought their car. The sampling variability associated with these statistics is
A. about the same.
B. much smaller for the sample of Canadians since the population of Canada is smaller than that of the United States, hence the sample is a larger proportion of the population.
C. much larger for the Canadians since Canada has a lower population density than the United States, hence Canadians tend to live farther apart which always increases sampling variability.
2. A sociologist wants to study the attitudes of American male college students toward marriage and husband-wife relations. She gives a questionnaire to 25 of the men enrolled in Sociology 101 at her college. All 25 complete and return the questionnaire. The sample in this situation is
A. all men taking a comparable sociology class.
B. the 25 men who received and returned the questionnaire.
C. all the men in the Sociology 101 class.
3. There are four people in a family-a father, a mother and two children-and they have won two tickets to go to Disneyland for a week. They decide to select a sample of two people for the trip as follows: The mother and father flip a coin to see which of the two of them will go, and they then flip a coin to see which of the two children will go. This is
A. a simple random sample of size two from the family since two coins were flipped.
B. a probability sample from the family since each member of the family has a known chance of being selected to go on the trip.
C. not a probability sample since the mother and father can't go together.
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Smallest standard deviation to the statistic
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Example on sampling variability
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Observational and sample study
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What is the explanatory variable in this study
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Sampling variability
: A simple random sample of 1000 Americans found that 61% were satisfied with the service provided by the dealer from which they bought their car.
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Evalauate the variance of their salaries
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Example on sampling distribution
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Example on stratified random sample
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Strength of a relationship
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