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a.For a confidence level of 96%, find the critical value b.In a recent poll, 170 people...

a.For a confidence level of 96%, find the critical value

b.In a recent poll, 170 people were asked if they liked dogs, and 56% said they did. Find the margin of error of this poll, at the 95% confidence level.

Give your answer to three decimals

c.Out of 200 people sampled, 32 had kids. Based on this, construct a 99% confidence interval for the true population proportion of people with kids.

Give your answers as decimals, to three places

______< p <_________

d.A political candidate has asked you to conduct a poll to determine what percentage of people support her.

If the candidate only wants a 7% margin of error at a 99% confidence level, what size of sample is needed?

Give your answer in whole people.

Math   Statistics-And-Probability   
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