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The length, in words, of the essays written for a contest are normally distributed with a population standard deviation of 442 and an unknown population
The length, in words, of the essays written for a contest are normally distributed with a population standard deviation of 442 and an unknown population mean. If a random sample of 24 essays is taken and results in a sample mean of 1330 , find a 99% confidence interval for the population mean.
z0.10 | z0.05 | z0.025 | z0.01 | z0.005 |
---|---|---|---|---|
1.282 | 1.645 | 1.960 | 2.326 | 2.576 |
You may use a calculator or the common z values above.
- Round each number to three decimal places, if necessary.
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