Posted by **cindy** on Wednesday, March 31, 2010 at 1:26pm.

A random sample of 40 men drank an average of 20 cups of coffee per week during examination final,

with the population standard deviation equal to 6 cups. A lower limit of an approximate 95% confidence

interval the population average cup of coffee is

(1) 20.000

(2) 21.859

(3) 19.708

(4) 18.141

(5) 19.051

I calculated the answer as no4?

- stats -
**Diamond**, Saturday, November 15, 2014 at 4:22pm
Use the confidence level and sample data to find a confidence interval for estimating the population μ. Round your answer to the same number of decimal places as the sample mean.

A group of 64 randomly selected students have a mean score of 38.6 with a standard 9) deviation of 4.9 on a placement test. What is the 90% confidence interval for the mean score, μ, of all students taking the test?

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