Essay
In 2008,the student body of a state university in Utah consisted of 30% freshmen,25% sophomores,27% juniors,and 18% seniors.A sample of 400 students taken from the 2009 student body showed that there are 138 freshmen,88 sophomores,94 juniors,and 80 seniors.Test with 5% significance level to determine whether the student body proportions have changed.
Correct Answer:
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H0 : P1 = 0.30,P2 = 0.25,P3 = 0.27,P4 = 0.18
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