A statistics practitioner took a random sample of 50 observation from a population whose standard deviation is 25 and computed the sample mean to be 100. Estimate the population mean by 90% confidence. b. Repeat part a using a 95% confidence level. c. Repeat part a using 99% confidence level. d. Describe the effect on the confidence interval estimate of increasing the confidence level.
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We are given the sample mean ($\bar{x}$), sample size (n), population standard deviation ($\sigma$), and confidence levels (90%, 95%, and 99%). Show more…
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