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The average tuition expense for a university is shown to be $15,420 per semester, but graduates...

The average tuition expense for a university is shown to be $15,420 per semester, but graduates feel that the average cost is not the same. A study conducted using 205 private universities showed that the average cost per term is $16,845 with a standard deviation of $1,100. Let = 0.05. What is the calculated test-statistic?

A. 18.548

B. 18.55

C. .00018

D. Cannot be determined

math   Statistics-And-Probability   
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Answer #1

Given the sample mean is and sample size is the sample standard deviation is . We have to test (Two tailed Z-test)

The test statistic is

Correct choice is A. 18.548.

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