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Unformatted text preview: ( 29 991 . 22 8 03 . 65 03 . 65 1 50 2 1 1 = = =--= = = = = n S n D D S n D D D n i i D n i i QAS128:001 Instructor: Yudan Zheng Sd/ racine n =22.991 (5) What is the test statistic? 17 . 2 991 . 22 50 =-=-= n S D t D D T=(/D ud ) / Sd/racine n (6) What is the critical value for testing at the 5% level of significance whether the business school preparation course is effective in improving exam scores? ANSWER: It is an upper-tail test, therefore, Critical value=tinv(2*alpha,n-1)=tinv(2*0.05,7)=1.895 (7) At the 0.05 level of significance, what is the conclusion for this hypothesis test? ANSWER: Reject the null hypothesis. That is, there is sufficient evidence that the preparation course does improve exam score. 2...
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- Fall '10