Two statisticians are given the same data from an experiment. Each uses these data to construct a confidence interval for the true population mean m. The resulting CIs are (8.55, 10.85) and (8.40, 11.0).
In each of the following problems, the population standard deviation, the bound on the error of estimation, and the confidence level are given. Find a value for the sample size n necessary to satisfy these requirements.
The number of active coal mines in Utah has steadily decreased since 1960. However, peak production occurred in 2001.8 One measure of mine productivity is tons/employee hour. In a random sample of 40 days, the mean tons/employee hour was 4.99. Assume s 5 1.14. Find a 95% confidence interval for the true mean tons/ employee hour.
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