Let's Practice Answer the problem below. A commonly used IQ test is scaled to have a mean of 100 and a standard deviation of 14,
Let's Practice Answer the problem below. A commonly used IQ test is scaled to have a mean of 100 and a standard deviation of 14, A school counselor was curios about the average IQ of the students in her school and took a random sample of forty students' IQ scores. The average of these scores was 107.9. Find a 95% confidence interval for the mean and determine the length of the confidence interval
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