{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

BSEC Test 3

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

This preview shows page 1. Sign up to view the full content.

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
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern