Question
The standard deviation of test scores on a certain achievement test is 10.7 A random sample of 150 scores on this test had a mean
The standard deviation of test scores on a certain achievement test is 10.7 A random sample of 150 scores on this test had a mean of 74.9. Based on this sample, find a 90% confidence interval for the true mean of all scores. Then gives its lower limit and upper limit.
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Elementary Statistics
Authors: Robert R. Johnson, Patricia J. Kuby
11th Edition
978-053873350, 9781133169321, 538733500, 1133169325, 978-0538733502
