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Roper ASW conducted a survey to learn about American adults' attitudes toward money and happiness. 56% of the respondents said they balance their checkbook at least once a month.
a. Assume a sample of 400 American adults were taken. Show the sampling distribution of the proportion of adults who balance their checkbook at least once a month.
b. What is the probability that the sample proportion will be within ± .02 of the population proportion?
c. What is the probability that the sample proportion will be within ± .04 of the population proportion?
Student A and B took different statistics classes and 2 different finals. Student A had a score of 83 out of 100 and ranked 72 in his class. Student b scored 85 out of 100 and he ranked in the 70 percentile of his class.
What is the probability that he completed the assignments?
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On average, the size of the difference between the sample mean and the population mean is predicted by:
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