You research the salaries of senior-level chemical engineers and find that the population mean is ($131,935.) In
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You research the salaries of senior-level chemical engineers and find that the population mean is \($131,935.\) In Exercise 4, does the t-value fall between -t0.95 and t0.95?
Data from Exercises 4
In a random sample of 12 senior-level chemical engineers, the mean annual earnings was \($133,326\) and the standard deviation was \($36,729.\) Assume the annual earnings are normally distributed and construct a 95% confidence interval for the population mean annual earnings for senior-level chemical engineers. Interpret the results.
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Related Book For 
Elementary Statistics Picturing The World
ISBN: 9781292260464
7th Global Edition
Authors: Betsy Farber, Ron Larson
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