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# Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

1. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 30,309
09-30-2005, 09:44 AM
1. ### Conditional Probability

I've been working on this one for the last 3 days to no avail. The problem is this: "A statistics professor wants to ensure that she is not late...

• Replies: 1
• Views: 5,786
08-15-2006, 09:59 PM
2. ### Conditional Probability

Hello, i am a tad confuzzled with conditional probability. I have a question i am half way through and i have hit a brick wall. It is given that:...

• Replies: 3
• Views: 3,333
01-20-2007, 09:44 AM
3. ### Conditional Probability

I have been working on this problem for two hours and i can't seem to get it right! 28 crayons, 4 are red. they are divided among 4 people evenly....

• Replies: 0
• Views: 1,821
02-02-2007, 03:13 PM
4. ### Conditional Probability

I was given this example to study, no solution to check my work. Can you help? I approached (a) using 1-P?? 1-30/100 and (b) 30/100+10/100-5/100...

• Replies: 2
• Views: 2,588
06-18-2007, 12:59 AM
5. ### Conditional Probability

I was hoping someone could shine some light on how to go about solving this question.... A dog has a litter of four pups. Assume, as usual, that...

• Replies: 1
• Views: 2,101
07-27-2008, 03:18 PM
6. ### Conditional Probability

nvm figured it out!!! sorry!!

• Replies: 0
• Views: 1,746
09-18-2009, 03:20 AM
7. ### conditional probability

hi, well i've just started to mess around the probabilities and the problem i don't understand is : if a probability for a person to finish his...

• Replies: 2
• Views: 2,247
03-19-2010, 02:40 AM
8. ### Conditional Probability

What is the chance that the seventh card from the top of the deck will be a heart? This question really stumped me. I thought and then divided by...

• Replies: 5
• Views: 4,631
07-11-2010, 02:49 PM
9. ### Conditional Probability

Hello, I have a question in probabilty. 100 Individuals. 40 with work experience, 30 with certificates and 20 with both work ex and...

• Replies: 1
• Views: 3,339
01-12-2011, 11:29 PM
10. ### Conditional Probability

Hello!!! Can anyone help me with this problem??...please!!! In relation to Equation P(A│B)=P(AB) / P(B) Show that: P(A│B)P(B)=P(B│A)P(A)

• Replies: 5
• Views: 2,689
03-20-2011, 09:12 PM
11. ### conditional probability

The table below displays data the First Bank of Silverhaven (FBS) has collected on the personal savings accounts of its job-holding customers. The...

• Replies: 3
• Views: 10,886
10-22-2013, 12:40 PM
12. ### Conditional probability

Hi guys. I am currently preparing for SOA Exam P and am having some questions. In a survey of 94 students, the following data was obtained. 60...

• Replies: 0
• Views: 1,343
01-25-2013, 01:19 PM
13. ### Conditional Probability

I need help with a couple of conditional probability questions: If a person is vaccinated properly, the probability of his/her getting a certain...

• Replies: 4
• Views: 8,520
11-20-2013, 10:57 PM
14. ### Conditional probability

Hello all I need some assistance with this problem: Let A and B be two event such that: P(A|~B) = 1/2 and P(B|AUB)=2/5 Find P(B)

• Replies: 1
• Views: 1,092
BGM
11-12-2013, 06:55 AM
15. ### Conditional Probability

http://i.imgur.com/9UELFY5.png Here is the problem in question. I have the answers for both of these already,but I am not sure I have 2b correct. ...

• Replies: 5
• Views: 1,196
12-14-2015, 05:18 PM
16. ### Conditional probability

Hello, I'm having an issue with a problem. I just have no clue how to solve it. A machine part may be selected from any of three manufacturers...

• Replies: 2
• Views: 1,904
01-16-2016, 10:21 PM
17. ### Conditional probability

I am consideriing the following identities: p(s' \lvert s,a) = p(x'_1,x'_2,c' \lvert x_1,x_2,c,a_1,a_2) = \pi(c'\lvert c)p(x'_2 \lvert...

• Replies: 0
• Views: 1,522
03-16-2016, 06:14 PM
18. ### conditional probability

For a combined ELISA-Western blot blood test for HIV positive status, the sensitivity P(positive test |HIV) is about 0.999 and the specificity...

• Replies: 2
• Views: 1,643
08-25-2016, 02:56 PM
19. ### Conditional Probability

Hello to everyone. I am new in the forum and in the statistics at all. I have some homework to do and I can't figure it out. I am trying to do those...

• Replies: 4
• Views: 2,070
10-02-2016, 06:10 AM
20. ### Conditional Probability

I have some ambiguity in the following problem Three cards are drawn in succession from a deck without replacement. find the probability...

• Replies: 6
• Views: 2,230
03-30-2017, 04:11 PM
21. ### Conditional Probability

Dear all Please help in solving the following problem. A large industrial firm uses 3 local motels to provide overnight accommodations for its...

• Replies: 1
• Views: 1,245
03-29-2017, 06:59 AM

Find the probabilities of getting (a) three 3's and then a 4 or 5 in four rolls of a balanced die. P(three 3's) = P(3rd is a three | 2nd is a...

• Replies: 2
• Views: 2,630
09-24-2011, 12:02 PM
23. ### Conditional Probability - Exam

Someone can help me please, I need to understand them for my exam on Monday in next week. Today is Saturday.....Thanks a lot..... USING AND...

• Replies: 2
• Views: 29,971
07-13-2016, 01:00 AM
24. ### conditional probability and mgf question

Hi i'm having trouble doing this question, any help would be much appreciated The time needed to defuse the bomb is modeled by a continuous...

• Replies: 2
• Views: 4,717
09-12-2010, 05:44 PM
25. ### conditional probability and size of population question.

deleted post. no responses.

• Replies: 1
• Views: 1,403
09-08-2012, 05:47 PM
26. ### conditional probability and trial of experiments

Consider a medical test for a disease, D. The test mostly gives the right answer, but not always. Say its false-negative rate is 1% and its...

• Replies: 2
• Views: 1,400
05-15-2013, 07:43 AM
27. ### Conditional Probability and Variance

In a conditional probability problem, I have computed Var(X|Y=y) for all values of y. How would I go about computing the Var(X) using this...

• Replies: 0
• Views: 3,990
04-20-2006, 09:59 PM
28. ### Conditional probability answer check

I just want to check my answer with you guys. A supermarket wants to know peoples shopping habits. 250 were surveyed. 60% was females. 70% of all...

• Replies: 1
• Views: 1,469
10-15-2015, 09:36 PM
29. ### Conditional Probability between two events

A jungle consists of two neighboring forests, A and B, which are separated with a river in between. The chance of finding a particular species of...

• Replies: 0
• Views: 1,725
06-16-2011, 10:48 PM
30. ### Conditional probability calculation

Please can someone help me with the following question: An urn contains 3 white, 6 red and 5 black balls. Six of these balls are randomly selected...

• Replies: 1
• Views: 7,435
BGM
08-08-2011, 11:16 AM
31. ### Conditional probability density function, practical example

Greetings to all the ones who are accepting to help people and greeting to the ones who are browsing in the forum! We have 2 independent random...

• Replies: 2
• Views: 4,836
10-03-2012, 03:07 AM
32. ### Conditional Probability Help.

Helloooo Statisticians! I have a question that I believe I can solve but somehow I'm not getting the correct answer. So I'd really appreciate if...

• Replies: 3
• Views: 2,012
08-23-2013, 02:58 PM
33. ### conditional probability mass function

Is my solution correct (Q) Suppose that p(x, y), the joint probability mass function of X and Y, is given by p(0, 0) = 0.4 p(0, 1) = 0.2 p(1, 0)...

• Replies: 0
• Views: 2,636
10-27-2011, 04:52 AM
34. ### Conditional probability of an event given two independent events

I am dealing with an interesting probability problem. I had 16 subjects randomly divided into 4 different rooms, each room having 4 seats. The...

• Replies: 2
• Views: 1,884
01-20-2015, 08:14 AM
35. ### Conditional probability of an event that never occurred

Hi folks, I'm facing a problem right now...given three events A, B and C, is it possible to estimate the occurrence of events A and C together...

• Replies: 1
• Views: 1,933
11-30-2010, 12:22 PM
36. ### Conditional probability of functions. Small question

Hey, i was just looking at a question where the question is calculate: P( B(t) =< x| x=B(s) ). That is, calculate the probability that B(t) is less...

• Replies: 0
• Views: 933
05-12-2016, 06:29 AM
37. ### conditional probability problem

can anyone give hint? if i apply the usual conditional probability rule what i get, for the 1st one say, is f(sigma_theta^2, sigma^2, mu, theta,...

• Replies: 0
• Views: 2,140
05-13-2008, 09:28 PM
38. ### conditional probability problem

Here's the question: The voters in a large city are 50% white, 40% black, and 10% Hispanic. Candidate Smith wins 40% of the white vote, 80% of...

• Replies: 2
• Views: 4,525
11-01-2009, 05:32 PM
39. ### Conditional Probability Problem

Hello all! I have a probability test tomorrow and have been working through practice problems but I ran into one that is giving me troubles. We...

• Replies: 2
• Views: 3,569
12-15-2010, 08:27 PM
40. ### Conditional probability problem

Hi, So here's the problem I've been working on for several hours now: "Deer ticks can be carriers of either Lyme disease or HGE. Based on a...

• Replies: 7
• Views: 5,985
02-06-2012, 09:27 PM
41. ### Conditional probability problem

One in five of Cadbury's specially marked chocolate bars (Promotion Products) will be packaged in a wrapper that entitles the holder to an instant...

• Replies: 3
• Views: 2,041
08-28-2013, 01:13 AM
42. ### Conditional probability problem

Hey all, I hope you can help me with this problem. Say that tomorrow I can go to Berlim with a probability of 20%, Madrid with a probability of...

• Replies: 1
• Views: 1,356
09-22-2013, 02:12 PM
43. ### Conditional probability problem

Given P(A1) = .12, P(A2) = .07, P(A3) = .05, P(A1 U A2) = .13, P(A1 U A3) = .14, P(A2 U A3) = .10, and P(A1 A2 A3) = .01 What is the probability...

• Replies: 1
• Views: 177
10-08-2017, 05:21 AM
44. ### Conditional Probability question

okay the problem statement is as follows A gene can be either type A or type B (ie note type A). A gene can also be either dominant or regressive....

• Replies: 3
• Views: 2,528
DAV
10-09-2008, 11:21 AM
45. ### Conditional probability Question

Hello, I'm trying to work out a conditional probability. I have two measurements of two variables (1) Start Time and (2) Distance. I've...

• Replies: 1
• Views: 1,347
BGM
06-22-2012, 10:31 AM
46. ### Conditional probability Question

Hi Guys, Could I ask a question with regards to probability theory? I have recorded some journey distances for cars. Here is an example. The...

• Replies: 1
• Views: 1,240
07-26-2012, 01:35 PM
47. ### Conditional probability question

Hi there, I have the journey times of 2 journeys. Would somebody be able to show me by way of example how to calculate the conditional...

• Replies: 0
• Views: 980
09-18-2012, 09:26 AM
48. ### conditional probability question

I'm having trouble with the following problem: I want to know P(X>C | W>C) with C a known fixed constant, X and W both normally distributed...

• Replies: 0
• Views: 1,084
04-15-2016, 10:28 AM
49. ### Conditional Probability question???? Help me ,please

1. Data on the 30 largest stock and balanced funds provided one-year and five year percentage returns for the period ending ending March 31, 2000...

• Replies: 0
• Views: 1,649
02-11-2014, 02:21 AM
50. ### Conditional Probability Questions

Hey guys, pretty simple question here (for yall I hope).... I'm trying to calculate a conditional probability, but I'm drawing the probabilities...

• Replies: 2
• Views: 1,477
11-15-2012, 09:40 PM
51. ### conditional probability sanity check

A device fails by going into mode A or mode B. There are many more ways to fail within the mode A category than within the mode B category. Given...

• Replies: 3
• Views: 2,246
06-08-2011, 04:43 PM
52. ### Conditional Probability Venn Diagram

I am having a very difficult time trying to determine how they got the probabilities shown in the Venn Diagram from the above information. I'm...

• Replies: 3
• Views: 5,529
BGM
10-17-2011, 03:09 AM
53. ### Conditional probability with Binomial distribution

Hello all I am trying to make a calculation here, and the result doesn't make sense to me, I don't know what I am doing wrong... I have a...

• Replies: 4
• Views: 7,657
08-15-2013, 03:27 PM
54. ### Conditional Probability [HELP]

I = innocent, G= guilty P(I) = 1, P(G) = 0 Conditional Probability Test Results: P(+ | I ) =0, P(+ | G ) = 1 Find P(G | +) in other words...

• Replies: 5
• Views: 2,539
09-11-2007, 06:02 PM

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