An IQ test is designed to have scores that have a standard deviation of = 15.
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An IQ test is designed to have scores that have a standard deviation of σ = 15.
A simple random sample of students at a large university will be given the test in order to construct a 98% confidence interval for the mean IQ of all students at the university. How many students must be tested so that the margin of error will be equal to 3 points?
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