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Unformatted text preview: (35 . 42 . 2010 · 7 . 2 √ 12 , 35 . 4 + 2 . 2010 · 7 . 2 √ 12 ), or (30 . 8 years , 40 . 0 years) . 1 (b) 1500 1600 1700 1800 1900 2000 20 25 30 35 40 45 50 Year Age The graph shows no correlation between time and age. Problem 19. Let μ = true average GMAT increase earned by students taking the review course. The hypotheses to be tested are H : μ = 40 versus H 1 : μ < 40 . Here, ∑ 15 i =1 y i = 556 and ∑ 15 i =1 y 2 i = 20966, so y = 556 15 = 37 . 1, s = r 15(20966)(556) 2 15(14) = 5 . 0, and t = 37 . 140 5 . / √ 15 =2 . 25 . Sincet . 05 , 14 =1 . 7613, H should be rejected at the α = 0 . 05 level of signiFcance, suggesting that the MBAs ‘R Us advertisement may be fraudulent. 2...
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 Spring '07
 Xu,Lily
 Statistics

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