Assume that the sample is a simple random sample obtained from a normally distributed population of IQ scores of statistics professors. Use the table below to find the minimum sample size needed to be 95% confident that the sample standard deviation s is within 20% of a. Is this sample size practical?
Assume that the sample is a simple random sample obtained from a normally distributed population of IQ scores of statistics professors. Use the table below to find the minimum sample size needed to be 95% confident that the sample standard deviation s is within 20% of a. Is this sample size practical?
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 26PFA
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Assume that the sample is a simple random sample obtained from a normally distributed population of IQ scores f statistics professors. Use the table below to find the minimum sample size needed
to be 95% confident that the sample standard deviation s is within 20% of o. Is this sample size practical?
To be 95% confident that s is
within
of the value of a, the sample size
In should be at least
65
To be 99% confident that s is
within
of the value of Go, the sample size
In should be at least
The minimum sample size needed is.
1% 5% 10% 20% 30% 40% 50%
19,205 768 192 48
21 12
1% 5% 10% 20% 30% 40% 50%
33,218 1,336 336
8
85 38 22 14
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