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OpenStudy (anonymous):
A random sample of 130 students is chosen from a population of 4,500 students. If the mean IQ in the sample is 120 with a standard deviation of 5, what is the 99% confidence interval for the students' mean IQ score?
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OpenStudy (anonymous):
OpenStudy (anonymous):
am i correct
OpenStudy (cj49):
yups
OpenStudy (cj49):
apply d zscore formula
OpenStudy (cj49):
z score is +- 2.576 sample mean +- 2.576(5/sqrt(130))
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OpenStudy (cj49):
interval turns out to be: 120±1.1296...
OpenStudy (anonymous):
Thanks very much
OpenStudy (cj49):
My Pleasure.
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