Question

We know the population standard deviation is $3,339," said Spencer. “So the next part of our analysis will be to calculate a z-test. The answer will help us determine if the average private university tuition and fee costs for our top 10 choices, which are $32,350, are significantly more expensive than the average claimed by the writer of the article.” To determine if the average private university tuition and fee costs are more expensive than the claimed average of $29,056, Spencer finds that the value of the z-test statistic is __________. Answer choices are rounded to the hundredths place. OOPS Your answer is incorrect. HINT Here you need to use the formula given, but you also need to be familiar with the terms in the formula. The is the sample mean, the population mean is , is the population standard deviation, and n is the sample size. 0.32 2.46 3.12 0.31 1.73 0.10

Answer 1

TS = (Xbar - mu)/(sd/sqrt(n))

=( 32350 -29056 )/( 3339/ sqrt(10))

= 3.11965

=3.12

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