Question

a) If n=390 and ˆpp^ (p-hat) =0.88, find the margin of error at a 99% confidence...

a) If n=390 and ˆpp^ (p-hat) =0.88, find the margin of error at a 99% confidence level

Give your answer to three decimals

b)Out of 200 people sampled, 44 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

c) If n=25, ¯xx¯(x-bar)=32, and s=2, construct a confidence interval at a 90% confidence level. Assume the data came from a normally distributed population.

Give your answers to one decimal place.

Math   Statistics-And-Probability   
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Answer #1

a. z value for 99% CI is 2.576 as P(-2.576<z<2.576)=0.99

So Margin of Error is

b. z value for 99% CI is 2.576 as P(-2.576<z<2.576)=0.99

So Margin of Error is

So CI is

c. t table value for 90% is TINV(0.1,24)=1.711

So Margin of Error is

So CI is

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