Unformatted text preview: you conclude that the death rate due to heart disease is lower for those who took the medication than for those who took the placebo? Ho: p1>=p2 Ha: p1<p2 a=0.01 Zo=2.33 Rej Reg z<2.33 p_=x1+x2/n1+n2 = 301+357 / 4700+4300 = 658 / 900 =0.0731 q_=1p_=10.0731=0.9269 z= (p^1p^2)(p1p2) / sqrt(p_q_(1/n1 + 1/n2)) = (0.0640.083) – 0 / sqrt((0.0731)(0.9269)(1/4700 + 1/4300)) = 3.46 M = nSIGxy – (SIGx)(SIGy) / nSIGx^2 – (SIGx)^2 = 8(3289.8) – (15.8)(1634) / 8(32.44) – 15.8^2 = 501.2/9.88 = 50.72874 b=y_mx_ = 1634/8 – (50.72874)15.8/8 = 204.25 – (50.72874)(19.75)= 104.0607 y^= 50.729x + 104.061...
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 Spring '10
 Zhang
 Accounting, Business, Randomness, Firm, mean salary

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