Statistics Help, Please?
Question by R.: Statistics Help, Please?
1.
In a survey conducted by researchers at the University of Wisconsin, subjects were asked the question “Have you ever used cocaine?” in one of three methods, anonymous survey, personal interview, or phone survey. The contingency table below shows the results of this survey of 2400 students. Suppose one subject is randomly selected from this group. Find the probability that the subject answered “No.” Show this answer as a fraction. Do not attempt to reduce the fraction.
Survey Method NO YES TOTAL
Anonymous 576 224 800
Personal 600 200 800
Phone 632 168 800
Total 1808 592 2400
2.
In a survey conducted by researchers at the University of Wisconsin, subjects were asked the question “Have you ever used cocaine?” in one of three methods, anonymous survey, personal interview, or phone survey. The contingency table below shows the results of this survey of 2400 students. Suppose one subject is randomly selected from this group. Find the probability that the subject answered “Yes” and participated in a phone interview. Show this answer as a fraction. Do not attempt to reduce the fraction.
Survey Method NO YES TOTAL
Anonymous 576 224 800
Personal 600 200 800
Phone 632 168 800
Total 1808 592 2400
3.In a survey conducted by researchers at the University of Wisconsin, subjects were asked the question “Have you ever used cocaine?” in one of three methods, anonymous survey, personal interview, or phone survey. The contingency table below shows the results of this survey of 2400 students. Suppose one subject is randomly selected from this group. Find the probability that the subject participated in an anonymous interview given that the person answered “Yes.” Show this answer as a fraction. Do not attempt to reduce the fraction.
Survey Method NO YES TOTAL
Anonymous 576 224 800
Personal 600 200 800
Phone 632 168 800
Total 1808 592 2400
I’m not necessarily looking for the answers, but if someone could give me a “helpful” explanation on how to solve them, I would really appreciate it!!
Best answer:
Answer by M3
Survey Method NO YES TOTAL
Anonymous … 576 224 800
Personal ……. 600 200 800
Phone ………. 632 168 800
Total ……….. 1808 592 2400
Probability = favorable outcomes / sample space
1. P(no) =1808/2400
2. P(yes) =592/2400
3. P(anonymous | yes) = 224/592
btw, why did you make such a long q out of it when the data & prelim are common ?
Give your answer to this question below!
Union requests bigger raise for city workers
Federal statistics bear out the union's contention that worker salaries since the 2008 market crash have trailed the inflation rate, although not necessarily at the rate UE 150 activists claimed. The city didn't hand out any permanent raises in fiscal … Read more on Durham Herald Sun
Ex-Con Job Fair Creates Hope and New Tax Payers
"Possession of cocaine," admitted Maurice. "I spent a year in prison." "Robbery and … Because statistics show that 75 percent of those who are sent to metro jail commit another crime once released, and go right back in. U.S. Attorney Kenyon Brown is … Read more on WPMI Local 15 News
Questions raised about huffing after college student in Claremont dies from …
In fact, the usage of whippets in some studies a few years back likened it to be as strong as persons drawn to cocaine. The usage pattern is people will take it more often to chase the high, so to … According to statistics from a 2012 National Survey … Read more on Inland Valley Daily Bulletin