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4) Assume that IQ scores of college graduates are normally distributed. A researcher collects a random...

4)

Assume that IQ scores of college graduates are normally distributed. A researcher collects a random sample of 21 college graduates and tests their IQ. The sample had a mean IQ of 109 with a standard deviation of 15.1.

a) Find a 95% confidence interval for the true mean IQ for college graduates.

b) Provide the margin of error of the interval as your answer.

Round your answer to 1 decimal place.

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