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It's believed that as many as 21% of adults over 50 never graduated from high school. We wish to see if this percentage is the same among the 25 to 30 age group. a) How many of this younger age group must we survey in order to estimate the proportion of non-grads to within 6% with 90% confidence? n = 125 (Round up to the nearest integer.) b) Suppose we want to cut the margin of error to 4%. What is the necessary sample size? n = 281 (Round up to the nearest integer.) c) What sample size would produce a margin of error of 3%. n=1.645 (Round up to the nearest integer.) That's incorrect. X

It's believed that as many as 21% of adults over 50 never graduated from high school. We wish to see if this percentage is the same among the 25 to 30 age group. a) How many of this younger age group must we survey in order to estimate the proportion of non-grads to within 6% with 90% confidence? n = 125 (Round up to the nearest integer.) b) Suppose we want to cut the margin of error to 4%. What is the necessary sample size? n = 281 (Round up to the nearest integer.) c) What sample size would produce a margin of error of 3%. n=1.645 (Round up to the nearest integer.) That's incorrect. X

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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please answer part c correctly, previous expert gave an answer of 1.645 which is incorrect 

It's believed that as many as 21% of adults over 50 never graduated from high school. We wish to see if this percentage is the same among the 25 to 30 age group. a) How many of this younger age group must we survey in order to estimate the proportion of non-grads to within 6% with 90% confidence? n = 125 (Round up to the nearest integer.) b) Suppose we want to cut the margin of error to 4%. What is the necessary sample size? n = 281 (Round up to the nearest integer.) c) What sample size would produce a margin of error of 3%. n = 1.645 (Round up to the nearest integer.) That's incorrect. Use the margin of error formula, ME=z size n. pq n OK to solve for the required sample X
Transcribed Image Text:It's believed that as many as 21% of adults over 50 never graduated from high school. We wish to see if this percentage is the same among the 25 to 30 age group. a) How many of this younger age group must we survey in order to estimate the proportion of non-grads to within 6% with 90% confidence? n = 125 (Round up to the nearest integer.) b) Suppose we want to cut the margin of error to 4%. What is the necessary sample size? n = 281 (Round up to the nearest integer.) c) What sample size would produce a margin of error of 3%. n = 1.645 (Round up to the nearest integer.) That's incorrect. Use the margin of error formula, ME=z size n. pq n OK to solve for the required sample X
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