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# 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?