Question

A marketing firm wishes to estimate the standard deviation of the ages of college students. How many students must the marketing firm randomly survey if they want to be 99% confident that the sample standard deviation of the ages of college students is within 5% of the true population standard deviation of ages of college students? 

e Required to Estimate a
Standard Deviation
Population
and to be 95%
confident of that
statement,
and to be 99%
confident of that
For s to be within
of a
statement,
the sample size, n, should be at least...
thin 20%
fident of
ple size
85
1%
19205
33218
g 99%
5%
768
n 1336
200]
10%
192
336
20%
48
85
30%
21
38
40%
12
22
50%
8
14
REES OF
Expand
Transcribed Image Text

e Required to Estimate a Standard Deviation Population and to be 95% confident of that statement, and to be 99% confident of that For s to be within of a statement, the sample size, n, should be at least... thin 20% fident of ple size 85 1% 19205 33218 g 99% 5% 768 n 1336 200] 10% 192 336 20% 48 85 30% 21 38 40% 12 22 50% 8 14 REES OF

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