A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing
 5 months ago
You are performing a cohort study to look at risk factors for breast cancer in postmenopausal women. If the probability of developing breast cancer among smokers is .05 for the study duration, then if you sample 100 smokers, how many do you expect to develop the disease? Give the expected value +/ 1 standard deviation.
 5 months ago
You are performing a cohort study to look at risk factors for breast cancer in postmenopausal women. If the probability of developing breast cancer among smokers is .05 for the study duration, then if you sample 100 smokers, how many do you expect to develop the disease? Give the expected value +/ 1 standard deviation.

This Question is Open

kropot72
 5 months ago
Best ResponseYou've already chosen the best response.2It appears that a binomial distribution applies. In that case the expected number to develop the disease would be the product of the sample size and the probability: \[\large Expected\ number=100\times0.05=you\ can\ calculate\]The standard deviation is given by: \[\large \sigma=\sqrt{100\times0.05\times0.95}=you\ can\ calculate\]
Ask your own question
Ask a QuestionFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.