# statistics

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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 -

8. A

9. B

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