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BSEC Test 3 - you conclude that the death rate due to heart...

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Employees in a large accounting firm claim that the mean salary of the firms accountants is less then that of it’s competitors, which is $45,000. A random sample of 30 of the firm’s accountants has a mean salary of $43,500 with a std dev of $5200. at a=0.05, test the employee’s claim. Claim is “mean salary is less than $45,00” Ho: u>=$45,000 Ha: u< $45,000 a=0.05 Zo=-1.645 Rej Reg z<-1.645 Z=x_ - u / o/sqrtN = 43,500 – 45,00 / 5200/sqrt30 A medical research team conducted a study to test the effect of a cholesterol-reducing medication. At the end of the study, the researchers found that of the 4700 randomly selected subjects who took the medication, 301 died of heart disease. Of the 4300 randomly selected subjects who took a placebo, 357 died of heart disease. At a=0.01, can
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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_=1-p_=1-0.0731=0.9269 z= (p^1-p^2)-(p1-p2) / sqrt(p_q_(1/n1 + 1/n2)) = (0.064-0.083) – 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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