Suppose a sample of 25 students with a sample mean IQ of 127. The population standard deviation was 5.4 . Calculate the 95% and 99% confidence interval for the population mean.

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
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Suppose a sample of 25 students with a sample mean IQ of 127. The
population standard deviation was 5.4. Calculate the 95% and 99%
confidence interval for the population mean.
Explain why the sample mean is a great estimator of the population
mean u.
Transcribed Image Text:Suppose a sample of 25 students with a sample mean IQ of 127. The population standard deviation was 5.4. Calculate the 95% and 99% confidence interval for the population mean. Explain why the sample mean is a great estimator of the population mean u.
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