Posted by **Lee** on Tuesday, April 29, 2014 at 9:21pm.

It is known that the population mean for the Quantitative section of the GRE is 500, with a

standard deviation of 100. In 2006, a sample of 400 students taking the GRE, whose family

income was between $70,000 and $80,000, had a quantitative GRE score of 511. Perform a

one-tailed hypothesis test to determine whether the group, whose family income was between

$70,000 and $80,000, scored significantly higher on average than the population.

8. What is the appropriate hypothesis test?

a. z-test

b. t-test for matched pairs

c. t-test for independent samples

d. chi square test for independence

9. What are the null and alternative hypotheses?

a. H0:μ=μ0; Ha:μ<μ0

b. H0:μ=μ0; Ha:μ>μ0

c. H0:μ=μ0; Ha:μ≠μ0

d. None of these are correct

- statistics -
**PsyDAG**, Wednesday, April 30, 2014 at 2:25pm
8. A

9. B

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