Mathematics, 08.06.2020 20:57 bossninja97588

The standard deviation of test scores on a certain achievement test is 10.5 . A random sample of 90 scores on this test had a mean of 72.1 . Based on this sample, find a 90% confidence interval for the true mean of all scores. What is the lower limit of the 90% confidence interval?

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The standard deviation of test scores on a certain achievement test is 10.5 . A random sample of 90...