Question

Researchers are interested in estimating the percentage of Americans who will get a flu shot this year. How many Americans should be surveyed to be 80% confident that the sample proportion of Americans who will get a flu shot this year is within 0.100 of the population proportion. Assume we have a prior estimate of 61%. Round your z critical value to four decimal places.

Name: researchers are interested in estimating the percentage of americans who will get a flu shot this year how many americans should be surveyed to be 80 confident that the sample proportion of 01546
Uploaded: 2021-12-26T13:56:46-08:00
Duration: 3 min 50 s
Channel: David Nguyen
Description: researchers are interested in estimating the percentage of americans who will get a flu shot this year how many americans should be surveyed to be 80 confident that the sample proportion of 01546

          Researchers are interested in estimating the percentage of
Americans who will get a flu shot this year. How many Americans
should be surveyed to be 80% confident that the sample proportion
of Americans who will get a flu shot this year is within 0.100 of
the population proportion. Assume we have a prior estimate of 61%.
Round your z critical value to four decimal places.

Added by Eduardo W.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

Instant Answer

Solved by Expert David Nguyen

12/26/2021

Step 1

Given that the confidence level is 80%, the alpha level is 1 - 0.80 = 0.20. Divide the alpha level by 2 to find the tail area: 0.20 / 2 = 0.10. Look up the Z value for a tail area of 0.10 in the Z table, which is approximately -1.28. Show more…

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Researchers are interested in estimating the percentage of Americans who will get a flu shot this year. How many Americans should be surveyed to be 80% confident that the sample proportion of Americans who will get a flu shot this year is within 0.100 of the population proportion. Assume we have a prior estimate of 61%. Round your z critical value to four decimal places.