s there a difference in the grades on tests given immediately before and immediately after the Thanksgiving holiday? To answer this, a professor gives one of her sections the test before the holiday and the other after it. The 30 students who took the test before the holiday had mean 80 and standard deviation 10, while the 30 students who took the test after the holiday had mean 70 and standard deviation 20. a) Find a 90% confidence interval for the difference in the mean scores before and after the holiday. b) If you did the corresponding hypothesis test to determine if the mean is higher before the holiday, what would be? c) Would the hypothesis test reject H0? Answer from the confidence interval—do NOT perform the test.
s there a difference in the grades on tests given immediately before and immediately after the Thanksgiving
holiday? To answer this, a professor gives one of her sections the test before the holiday and the other after it.
The 30 students who took the test before the holiday had
students who took the test after the holiday had mean 70 and standard deviation 20.
a) Find a 90% confidence interval for the difference in the mean scores before and after the holiday.
b) If you did the corresponding hypothesis test to determine if the mean is higher before the holiday, what
would
be?
c) Would the hypothesis test reject H0? Answer from the confidence interval—do NOT perform the test.
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