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QUESTION
statistic practitioner drew a random sample of 400 observations and found that x and . Estimate the population mean with 90% confidence. Repeat part...
1. statistic practitioner drew a random sample of 400 observations and found that x̅ and . Estimate the population mean with 90% confidence. 2. Repeat part (1) with a 95% confidence level.
3. Repeat part (1) with a 99% confidence level.
4. What is the effect on the confidence interval estimate of increasing the confidence level?
