{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

211-01-02+Class+17+HW12_1_

# 211-01-02+Class+17+HW12_1_ - HW 12 Ex 35(p 439 Issue...

This preview shows pages 1–34. Sign up to view the full content.

HW 12 Ex 35 (p 439) Issue: Quality of two TV commercials BusQues: Can we conclude that there is a difference in the "recall proportions" for the two commercials? (If so, which is a stronger commercial?) Data: Telephone surveys after commercials shown 6 times in one week. (evidence) Sample of 150 individuals vis-à-vis commerical A; 63 recalled it. p-barA = 0.420 sample recall proportio Sample of 200 individuals vis-à-vis commercial B: 60 recalled it. p-barB = 0.300 sample recall proportio p-bar = pooled est of p = 0.351 =(150*0.42 + 200*0.30)/(150+200 Analysis: Normal Test for Two Proportions [need because Ho includes equality] 1 2 (2) If Ho is true, this statistic is Normal with mean = 0 and std err we can calculate. Std Error = 0.052 =(p-bar*(1-p-bar)*(1/150+1/200))^.5 <-- Need to use "poole 3 Sig Level: alpha = 0.05 4 Reject rule: -0.101 or > 0.101 5 Calculations: =NORMINV(.025,0,0.052) =NORMINV(0.975,0,0.052) 0.120 p-value = 0.020 =1-NORMDIST(0.12,0,0.052,TRUE) 6 Conclusion: Reject Ho BusAnswer: For these samples, the recall is 12 % higher for commercial A than B. Sample Recall proportion (A) = 0.42, i.e. 42% of the sample of 150 recalled commercial A. Sample Recall proportion (B) = 0.30, i.e. 30% of the sample of 200 recalled commercial B. Ho: p A = p B , or p A -p B = 0 Ha: p A <> p B , or p A -p B <> 0 Test statistic: (1) p-bar A - pbar B , (difference in the sample proportions) Reject Ho if (p-bar A -p-bar B ) < p-bar A -p-bar B = The data of these two samples provide strong evidence to conclude that the recall proportion for commercial A is higher than that for commercial B.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
on --A on --B 0) ed" p-bar
Issue: Men and women stopping and asking question. BusQues: Are women more likely to stop and ask questions than men? Data: Automobile Association of America survey (January 2006) -- sample of 811 women and 7 "If you and your spouse are driving together and become lost, would you stop and ask for Sample results: Yes Total p-bar's Women Since Ho will include '= Men Pooled p-bar = Analysis: Normal Test for Two Proportions 1. Hyp's 2. TeStat: 1) 2) 3. SigLev: alpha = 0.05 4. Rej Rule: 5. Calculations: 6. Concl: Answer:

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
1--Yes, 0--No Women Men 750 men: 0 0 r directions?" 1 0 1 0 =', 0 0 1 0 1 0 1 0 0 0 0 1 1 0 0 0 1 0 1 0 0 0 1 1 0 0 1 0 1 0 0 0 1 0 1 0 0 0 1 0 0 0 1 1 0 0 1 0 0 1 1 0 1 1 0 0 0 0 0 1 0 1 1 1 0 0 0 1 0 0 0 0 0 0 0 1 1 1 0 1 1 0 0 0 1 1 1 0 1 0 1 1

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
0 1 1 0 0 0 1 0 0 0 1 1 1 1 1 0 1 1 1 0 1 0 0 0 0 0 1 1 0 1 1 1 1 0 0 0 1 1 0 0 1 0 0 1 0 0 1 1 0 1 1 0 0 0 0 1 0 0 0 0 0 0 1 1 1 1 0 0 0 1 1 0 1 0 1 0 1 1 0 0 0 1 0 1 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 1 0
This is the end of the preview. Sign up to access the rest of the 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