Question

A poll found that 85% of a random sample of 1056 adults said that they believe...

A poll found that 85% of a random sample of 1056 adults said that they believe in ghosts.

a. Determine the margin of error for a​ 99% confidence interval.

b. Without doing any​ calculations, indicate whether the margin of error is larger or smaller for a​ 90% confidence interval.

Math   Statistics-And-Probability   
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Answer #1

Refer Z-table or use excel function "=NORM.S.INV((1-0.005))" to find the Z-value

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The margin of error becomes smaller as the level of confidence decreases (that is from 99% to 90%).

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