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The standard deviation of test scores on a certain achievement test is 11.2. A random sample of 50 scores on this test had a mean

The standard deviation of test scores on a certain achievement test is 11.2. A random sample of 50 scores on this test had a mean of 76.7. Based on this sample, find a 90% confidence interval for the true mean of all scores. Then give its lower limit and upper limit. Round up to one ecimal place.

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