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APPLYING BAYES THEOREM

Customer Question
APPLYING BAYES THEOREM
Submitted: 5 years ago.Category: Homework
6/3/2012
Tutor: akch2002, Engineer replied 5 years ago
akch2002, Engineer
Category: Homework
Satisfied Customers: 3,134
Experience: Home work expert
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Customer reply replied 5 years ago

I did a survey for a project and need to apply Bayes Theorem from the results:

Question 4: Income Level

Response Percentage

20000> 5 10.2%

20,001-40,000 6 12.2%

41,000-60,000 14 28.6%

61,000-80,000 13 26.5%

80,000< 11 22.4%

This is an example of how it should be set up:

 Event Prior ProbabilityP(Ci) Conditional ProbabilityP(B|Ci) Joint ProbabilityP(Ai and B) Posterior ProbabilityP(Ai|B) 21-30 .33 .16 0.0528 0.0528/0.1551 = 0.35 31-40 .41 .20 0.082 0.082/0.1551 = 0.52 41-50 .19 .09 0.0171 0.0171/0.1551 =0.11 50+ .08 .04 0.0032 0.0032/0.1551 =0.02 P(B) = 0.1551 = 1.00
Tutor: akch2002, Engineer replied 5 years ago
Sorry, I won't be able to help you and will opt out.
Customer reply replied 5 years ago
ok, please do so quickly to release my deposit.
Tutor: Steve, Teacher replied 5 years ago
Steve, Teacher
Category: Homework
Satisfied Customers: 7,610
Experience: I teach Calculus and Probability in a University since 1994
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Hi,

Can you clarify the question ?

Steve
Tutor: Steve, Teacher replied 5 years ago
I think you have the "Prior Probability"

I can do the example considering the same "Conditional Probabilities" of the table above

Let me know....

Steve
Customer reply replied 5 years ago

ok. it was a survey we did and i need help applying the theorem to the results. what info can i give you?

Tutor: Steve, Teacher replied 5 years ago
Give me all the info that you have

For example definitions of Ai, Bi, Ci

I kknow how to apply the theorem but tell me the success B given and Conditional Probabilities
Customer reply replied 5 years ago

it was suggested using Bayes Theorem in regards to Q8 and demographic questions to predict.

1. Gender
2. Education Level
3. Income
4. Age

I suggest we break this up and everyone take one of the demographics and in relation to Q8 predict positive or negative views by consumer utilizing Bayes Theorem.

Question 8 : Would knowing that banks refused government taxpayer bailout funds influence your decision to get a loan over your current lender?

Responses Percentage

Yes 22 44.9%

No 27 55.1%

Tutor: Steve, Teacher replied 5 years ago
But, that´s another question (question 8)

Steve
Tutor: Steve, Teacher replied 5 years ago
Or if you want to upload a file

Use www.wikisend.com (it is free and easy to use)

Steve
Customer reply replied 5 years ago

OK. Let me see. I attached what another student turned in as part of the assignment.

Tutor: Steve, Teacher replied 5 years ago

Steve

Customer reply replied 5 years ago
do i need to register for that site? i'm trying to sign up.
Tutor: Steve, Teacher replied 5 years ago
No, you do not have to register

Steve
Customer reply replied 5 years ago
I'm getting an error message when i try to upload. it says website under maintenance. i'll keep trying.
Tutor: Steve, Teacher replied 5 years ago
That´s strange

The site works for me now

Steve
Customer reply replied 5 years ago

Tutor: Steve, Teacher replied 5 years ago
Yes, you can upload a word file

another site is:

www.mediafire.com (but you have to register there)

Steve
Tutor: Steve, Teacher replied 5 years ago
or

Steve
Customer reply replied 5 years ago
THAT WORKED -

http://www.mediafire.com/?zla8il6cip44xlr

Tutor: Steve, Teacher replied 5 years ago
Ok, i will check the link now

Steve
Customer reply replied 5 years ago

i'm looking for definitions of Ai, Bi, Ci

Tutor: Steve, Teacher replied 5 years ago
I have the file

But for question 4 is missing info

I only see a table (that helps for some probabilities)

But i need the question too and some info about the given sucess to apply Bayes

Steve
Tutor: Steve, Teacher replied 5 years ago
I have to go out now, i will be back later today (about 6 pm)

Steve
Customer reply replied 5 years ago

the survey had 49 participants and the percentage on there are the responses based on that 49 people who responded. i have not done the bayes theorem before so i am not sure what other info is needed. what info is needed for question 4? this is the survey results for that question.

Question 4: Income Level

Response Percentage

20000> 5 10.2%

20,001-40,000 6 12.2%

41,000-60,000 14 28.6%

61,000-80,000 13 26.5%

80,000< 11 22.4%

Tutor: Steve, Teacher replied 5 years ago
When you apply Bayes´s theorem you need to have a sucess given

with that table you can compute "Priori probabilities" but the info missing is:

"Conditional probabilities"

Steve
Customer reply replied 5 years ago
i am supposed to use the answers from question 8 to create the probability between the different income levels purchasing based on how many people answered the survey.
Customer reply replied 5 years ago
Relist: Other.
hasnt answered yet and question is time sensitive
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