Homework Help: statistics

Posted by Sally on Monday, August 15, 2011 at 11:00pm.

a. A statistics practitioner randomly sampled 100 observations from a population with a standard deviation of 5 and found that x is 10. Estimate the population mean with 90% confidence.

statistics - MathGuru, Tuesday, August 16, 2011 at 10:36am
Formula:
CI90 = mean + or - 1.645(sd/√n)

sd = standard deviation
n = sample size

Substitute the values from your problem into the formula and calculate.

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