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OpenStudy (kj4uts):
A sample of 144 was taken from a population with a standard deviation of 36 inches. In this case, the sample mean will be within how many inches of the population mean 99.7% of the time? A. 9 B. 6 C. 3 D. 12
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OpenStudy (kj4uts):
@jim_thompson5910
OpenStudy (kj4uts):
I have this so far: mean +/- z score * standard error mean +/- z score * (standard deviation of population) / sqrt(n) 144 +/- 3* 36 / sqrt(144)
OpenStudy (kj4uts):
Would this be how you solve this? 3* 36 / sqrt(144) = 9
jimthompson5910 (jim_thompson5910):
That looks correct
OpenStudy (kj4uts):
so 9 would be the answer?
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jimthompson5910 (jim_thompson5910):
yes
OpenStudy (kj4uts):
ok thanks :)
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