Mathematics, 05.05.2020 01:22 bri9263

Suppose the length, in words, of the essays written for a contest are normally distributed and have a known population standard deviation of 325 words and an unknown population mean. A random sample of 25 essays is taken and gives a sample mean of 1640 words.

Identify the parameters needed to calculate a confidence interval at the 98% confidence level. Then find the confidence interval.

z0.10 z0.05 z0.025 z0.01 z0.005
1.282 1.645 1.960 2.326 2.576

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