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A simple random sample of 100 items from a population with a population standard deviation of...

A simple random sample of 100 items from a population with a population standard deviation of 9 resulted in a sample mean of 42.

1. Determine a 90% confidence interval for the population mean.

2. Determine a 95% confidence interval for the population mean.

3. What happened to the width of the confidence interval as the level of confidence increased from 90% to 95%?

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