statistics
posted by Lee .
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
onetailed 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. ztest
b. ttest for matched pairs
c. ttest 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

8. A
9. B