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= (Round up to the nearest integer.)

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
icon
Related questions
Question

please answer part C correctly

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= (Round up to the nearest integer.)
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= (Round up to the nearest integer.)
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

Blurred answer
Recommended textbooks for you
MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
Statistics
ISBN:
9781119256830
Author:
Amos Gilat
Publisher:
John Wiley & Sons Inc
Probability and Statistics for Engineering and th…
Probability and Statistics for Engineering and th…
Statistics
ISBN:
9781305251809
Author:
Jay L. Devore
Publisher:
Cengage Learning
Statistics for The Behavioral Sciences (MindTap C…
Statistics for The Behavioral Sciences (MindTap C…
Statistics
ISBN:
9781305504912
Author:
Frederick J Gravetter, Larry B. Wallnau
Publisher:
Cengage Learning
Elementary Statistics: Picturing the World (7th E…
Elementary Statistics: Picturing the World (7th E…
Statistics
ISBN:
9780134683416
Author:
Ron Larson, Betsy Farber
Publisher:
PEARSON
The Basic Practice of Statistics
The Basic Practice of Statistics
Statistics
ISBN:
9781319042578
Author:
David S. Moore, William I. Notz, Michael A. Fligner
Publisher:
W. H. Freeman
Introduction to the Practice of Statistics
Introduction to the Practice of Statistics
Statistics
ISBN:
9781319013387
Author:
David S. Moore, George P. McCabe, Bruce A. Craig
Publisher:
W. H. Freeman