Question: An existing inventory for a test measuring self-esteem indicates that the scores have a standard deviation of 9. A psychologist gave the self-esteem test to

An existing inventory for a test measuring self-esteem indicates that the scores have a standard deviation of 9. A psychologist gave the self-esteem test to a random sample of 90 individuals, and their mean score was 66. Construct a 90 % confidence interval for the true mean of all test scores. Then give its lower limit and upper limit.

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