Asked by kat

A standard IQ test has a mean of 98 and a standard deviation of 16. We want to be 90% certain that we are within 8 IQ points of the true mean. Determine the sample size.
Answered by stucci
(z * sigma / error )^2
round up
Answered by terry
assuming that adults have IQ scores that are normally distributed with a mean of 100 and standard deviation of 15. Find the probability that a randomly selected adult has an IQ less than 121.
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