Find all School-related info fast with the new School-Specific MBA Forum

It is currently 18 Sep 2014, 23:51

Close

GMAT Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Medical researchers know that the probability of getting

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 02 Mar 2004
Posts: 330
Location: There
Followers: 1

Kudos [?]: 0 [0], given: 0

GMAT Tests User
Medical researchers know that the probability of getting [#permalink] New post 15 May 2004, 15:42
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Medical researchers know that the probability of getting lung cancer if a person smokes is .34. The probability that a nonsmoker will get lung cancer is .03. It is also known that 11% of the population smokes. What is the probability that a person with lung cancer will have been a smoker?
SVP
SVP
User avatar
Joined: 30 Oct 2003
Posts: 1798
Location: NewJersey USA
Followers: 4

Kudos [?]: 34 [0], given: 0

GMAT Tests User
 [#permalink] New post 16 May 2004, 03:51
p(s) = person smokes = 0.11
p(n) = person does not smoke = 1-0.11 = 0.88
p(c1) = cancer if smoking = 0.34
p(c2) = cancer if not smoking = 0.03

no of people who get cancer = [ p(c1) * p(s) + p(c2) * p(n) ] * 100
no of people who smoke and get cancer = p(c1) * p(s) * 100

This is so because we already know that a person has cancer and we need to determine if he/she did smoke ( we are dealing with a much narrower range of the sample )

P = ( 0.11 * 0.34 ) / [ 0.11 * 0.34 + 0.88 * 0.03 ] = 0.5862 ( I used a calc)

What this says is that there is high probability( higher than just 0.34 ) that a person smoked if he/she had a lung cancer.

I hope I am right.
Senior Manager
Senior Manager
avatar
Joined: 02 Mar 2004
Posts: 330
Location: There
Followers: 1

Kudos [?]: 0 [0], given: 0

GMAT Tests User
Re: PS-38 [#permalink] New post 17 May 2004, 12:30
hallelujah1234 wrote:
Medical researchers know that the probability of getting lung cancer if a person smokes is .34. The probability that a nonsmoker will get lung cancer is .03. It is also known that 11% of the population smokes. What is the probability that a person with lung cancer will have been a smoker?


----------smoke---No smoke
Lung------.34*11--.03*89---6.41
Not-Lung-.66*11--.97*89--93.59
Total----------11-------89----100

Answer = .34*11/6.41 = .583
SVP
SVP
User avatar
Joined: 30 Oct 2003
Posts: 1798
Location: NewJersey USA
Followers: 4

Kudos [?]: 34 [0], given: 0

GMAT Tests User
 [#permalink] New post 17 May 2004, 12:49
hi ndidi04,

What are you trying to do here?

Anand. :shock:
  [#permalink] 17 May 2004, 12:49
    Similar topics Author Replies Last post
Similar
Topics:
23 Experts publish their posts in the topic In 1984 medical researchers at Harvard and Stanford ... gmatter0913 23 03 Oct 2013, 20:03
1 Medical researchers discovered that people with an atypical Khalidb 21 22 Nov 2011, 09:46
Probable to get probability questions ??? jinesh 10 06 Jan 2006, 04:31
Frazier and Mosteller assert that medical research could be DLMD 5 04 Feb 2005, 15:14
Medical researchers know that the probability of getting schumacher 2 01 Jan 2005, 21:44
Display posts from previous: Sort by

Medical researchers know that the probability of getting

  Question banks Downloads My Bookmarks Reviews Important topics  


cron

GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.