A survey of business students who have taken the Graduate Management Admission Test (GMAT) indicated that students who have spent at least five hours studying GMAT review guides have a probability of .85 of scoring above 400 . Students who do not spend at least five hours reviewing have a probability of .65 of scoring above 400 . It has been determined that 70 of the business students spent at least five hours reviewing for the test.
a. Find the probability of scoring above 400.
b. Find the probability that given a student scored above 400, he/she spent at least five hours reviewing for the test.
Question 2
With nonprobabilistic sampling
a. it is possible to make estimates about the precision of the population parameters.
b. it is not possible to make statements about the precision of estimates made concerning the population parameters.
c. estimates can be made with precision if the sample is larger than 30.
d. none of these alternatives is correct.
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