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SolE1VerC - Solutions to Exam#1 Version C Q No on Ver A 1 2...

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Solutions to Exam #1, Version C Q No. on Ver A Solutions Version A 1 The problem states to find if cars performance is better than manufacturers rating , so Ha : M > 30 hence Ho:M<=30 E 2 Tcrit is printed in the output Table as 2.62 A 3 Since T* (2.04)< Tcrit(2.62) we FTR Ho; and conclude there is insufficient evidence for alternate hypothesis to be true. B 4 Xbar + T(alpha)(S/sqrt(n) = 31.853 + 2.62(3.5/3.87)=34.5 D 5 We chose T test because sample size is small and population std. deviation is not known B 6 The salesman believes that cars get over 400 miles ,so Ha: M > 400 and Ho: M<=400 B 7 T cal= (Xbar- M)/(s/sqrt(n)) =4.01 D 8 Z value of 0.889 corresponds (is close to) to area of 0.3130, so p- value is 0.5-0.3130 =0.1870 E 9 Since P-value (0.187) > 0.1 we FTR Ho and conclude that there is insufficient evidence that the cars give over 400 miles. D 10 T-crit value from the output Table given is 1.3968 E 11 Calculated value of Test Statistic is 4.11( from same Table) C 12 The p-value printed in the same Table is 0.0033, clearly < 0.01 E 13 The problem asks to test if proportion of men is larger than proportion women so Ha: p(m) >p(f) A 14 Calculated value of Test Statistic is
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