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In a random sample of 19 senior-level chemical engineers, the mean annual earnings was 132150 and...

In a random sample of 19 senior-level chemical engineers, the mean annual earnings was 132150 and the standard deviation was 35660. 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. What is the critical value?
2. What is the standard error of the sample mean?
3. The margin of error?
4. The lower limit of the interval?
5. The upper limit of the interval?
Math   Statistics-And-Probability   
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