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5) Suppose that simple random samples of college freshman are selected from two universities, 25 students...

5) Suppose that simple random samples of college freshman are selected from two universities, 25 students from school A and 20 students from school B. On a standardized test, the sample from school A has an average score of 1010 with a standard deviation of 100. The sample from school B has an average score of 990 with a standard deviation of 90.

a) What is the 90% confidence interval for the difference in test scores at the two schools? Use your calculator.

b) Interpret the confidence interval.

c) What is the margin of error?

Math   Statistics-And-Probability   
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