Mathematics, 19.06.2020 08:57 nerual0503
The average number of days required by a college’s undergraduate students to complete a project was 22 days in the previous year. The college administration wishes to determine whether the average differs this year. A sample of 20 students produced a sample mean of 20 days this year, with a sample standard deviation of 6 days. Assume that the number of days to complete the project is normally distributed. Is there enough evidence at the 5% significance level to determine whether the mean has increased?
a. No, because the test statistic falls outside the rejection region [1.645, [infinity]).
b. Yes, because the test statistic falls in the rejection region (-[infinity],-1.96].
c. No, because the test statistic falls outside the rejection region [1.960, [infinity]).
d. No, because the test statistic falls outside the rejection region [1.729, [infinity]).
e. None of the above
Answers: 3
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