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In a random sample of 15senior-level chemical engineers, the mean annual earningswas138100and the standard deviation was 35300. Assume the annual earnings are normally distributed and

In a random sample of 15senior-level chemical engineers, the mean annual earningswas138100and the standard deviation was 35300. Assume the annual earnings are normally distributed and construct a 95% confidence interval for the population mean annual earnings for senior-level chemical engineers.

1. The critical value:

The margin of error:

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