1 a previous survey showed that 83 of the people who take, Ask an Expert

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1. A previous survey showed that 83% of the people who take the daily newspaper read the sports section. What sample size is needed to be 90% confident that the true

proportion is within 3%?

2. Find the 90% confidence interval for the population standard deviation if a sample of 16 had a standard deviation of 2.4.

3. Find the 99% confidence interval for the population standard deviation if a sample of 27 had a standard deviation of 25.4.

4. In a sample of 250 dogs, 30 were registered with the AKC. What is the 95% confidence interval for the population proportion?

5. What sample size is needed to find the percent of the customers at a store that are married, if 90% confidence is desired to be within a 5% margin of error?

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Category:- Statistics and Probability
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