Sample Distribution Scenario Questions
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Sample Distribution Questions:
1. A researcher is interested in determining the average number of years employees of a company stay with the company. If past information shows a standard deviation of 7 months, what size sample should be taken so that at 95% confidence the margin of error will be 2 months or less?
2. In a sample of 200 individuals, 120 indicated they are Democrats. Develop a 95% confidence interval for the proportion of people in the population who are Democrats.
3. In a random sample of 400 registered voters, 120 indicated they plan to vote for candidate A. Determine a 95% confidence interval for the proportion of all the registered voters who will vote for candidate A.
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Solution Summary
In this solution we solve a series of questions involving sample distribution.
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Sample Distribution 6
1. A researcher is interested in determining the average number of years employees of a company stay with the company. If past information shows a standard deviation of 7 months, what size sample should be taken so that at 95% confidence the margin of error will be 2 months or less?
The sample size is given by the formula n=
Sample Size Determination
Data
Population Standard ...
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