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The educational testing service (ETS) designs

by | Nov 30, 2023 | Posted Questions

Null and Alternative Hypothesis

The educational testing service
(ETS) designs and administers the SAT exams. Recently the format of the exam
changed and the claim has been made that the new exam can be completed in an
average time of 120 minutes. A sample of 50 new exam times yielded an average
time of 115 min. The standard deviation is assumed to be 2 minutes.

a. Set
up the null and the alternative hypotheses to test if average time to complete
the exam has changed from 120 minutes.

b. Test
your hypothesis using alpha = 0.05

c. Find
p value

d. Based
on the p value, what can you conclude about the average time to complete the
new exam?
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