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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: 30,184
09-30-2005, 09:44 AM
1. ### Stochastic Process a martingale

Hey guys I posted here a couple months ago and everyone was really helpful. I am reaching out tonight to make sure I am doing a problem correctly. I...

• Replies: 0
• Views: 1,770
07-01-2012, 08:01 PM
2. ### Point me in the right direction on a game probability

This is my third time typing this grrrr. Let's hope my login holds this time. I have written a dice game for the computer and now I am trying to...

• Replies: 3
• Views: 1,927
06-30-2012, 07:52 PM
3. ### Whats the probability the parameters of my random sample match those of the whole?

I have been posed a problem, which i am struggling with: If I have a box of 2,808 lottery style tickets with winning ticket /denominations as...

• Replies: 2
• Views: 1,876
06-29-2012, 12:19 PM
4. ### Generate Random Correlated Variable

I have established a correlation between independent X and dependent Y. Is there a formula for generating a random Y from a particular X? For...

• Replies: 17
• Views: 15,186
06-29-2012, 09:43 AM
5. ### Density function from discrete time values?

Hello, I have a set of times achieved by an agent and want to determine if a probability density function can be derived from that set. Being a...

• Replies: 1
• Views: 1,836
06-29-2012, 08:30 AM
6. ### Determining if a bag of coins contains fair coins

This is actually a problem from a specific biological dataset, but can be more generally described as follows: I have a bag containing n coins....

• Replies: 1
• Views: 1,126
06-28-2012, 07:06 PM
7. ### Probability of 3 out of 4 Independent Events Occurring in Golf Foursome

I have 4 golfers playing together in a foursome. I know the probability of each making a par or better on a given hole: A-player: 60% ...

• Replies: 6
• Views: 2,928
06-28-2012, 10:11 AM
8. ### Determining the probability of an electric car charging station being available?

Hi there, I'm just wondering if anybody would know of a way of determining the probability of an event. I trying to figure out how I could...

• Replies: 0
• Views: 1,011
06-27-2012, 09:29 AM
9. ### poisson distribution

1)A car hire firm has 2 cars which it hires out day by day.The number of demands for a car on each day is distributed as a poisson distribution with...

• Replies: 0
• Views: 1,251
06-27-2012, 05:39 AM
10. ### Polyp probability

some help would be greatly appreciated, this should be easy for people here, but unfortunately i am bad with this stuff. 15 polyps are discovered...

• Replies: 12
• Views: 2,430
06-27-2012, 12:15 AM

Hi all, I have been working on this problem for a few days now and I think I am on the right track but not 100% sure. " ... If times are...

• Replies: 1
• Views: 1,620
06-26-2012, 09:30 PM
12. ### Adjusting ranges of probabilities based on a single variable

Hi everyone, I've been trying to solve this problem for a few weeks now, but can't think of any solutions. I can't think of how to generalize...

• Replies: 2
• Views: 1,588
06-26-2012, 10:43 AM
13. ### Field Assignment

Please help me in finalizing all the sets in this event space. I am creating a field generated by script B: {{2,4},{6,8}}.

• Replies: 6
• Views: 2,063
06-26-2012, 12:29 AM
14. ### Need help to understand basic probability problem

This thread is rather a continuation of http://www.talkstats.com/showthread.php/26030-Meanings-of-a-set-of-data/page3 Let consider following 2...

• Replies: 9
• Views: 2,206
06-25-2012, 09:00 PM
15. ### Scrabble probability question

I was playing Scrabble with my Dad earlier today. To decide who would play first we each drew a tile - the person with the tile closest to A would...

• Replies: 2
• Views: 2,263
06-25-2012, 01:21 PM
16. ### probability

If 4 distinct balls are distributed over 4 distinct boxes. Each ball has a 90% probability of being seen in the box that it is in. Then what is the...

• Replies: 0
• Views: 1,394
06-25-2012, 01:20 AM
17. ### 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: 1,338
BGM
06-22-2012, 10:31 AM
18. ### Seeking help with a condition probability question

Hello, I have measurements of 3 variables (1) Journey start time (2) Distance travelled (3) Journey Time. I am looking to work out the...

• Replies: 0
• Views: 1,187
06-22-2012, 05:48 AM
19. ### How to generate a certain number of random numbers from a gamma distribution that sum

Hello, Would anybody be able to advise me or tell me how you could generate a certain number of random numbers from a gamma distribution that sum...

• Replies: 1
• Views: 2,009
06-21-2012, 05:57 PM
20. ### skewness of a sum of correlated Bernoulli distributed variables

Hello everybody, I've got n bernoulli distributed variables. Each of the variables is an indicator 1(Di) in another function L(i), representing...

• Replies: 2
• Views: 3,409
06-21-2012, 05:25 PM
21. ### Homework problem, help me!

Circuit boards are produced by a machine. Each board may turn out to be defective (Outcome D) with probability 0.1, good (Outcome D') with...

• Replies: 4
• Views: 4,577
06-20-2012, 06:10 AM
22. ### Another joint density problem

it seems that i cant understand the boundaries... the joint density function: f(u,v)= a , u^2 <= v <= 1 0 , else find a i...

• Replies: 2
• Views: 1,353
06-20-2012, 04:21 AM
23. ### Have a probability question that's too complex for me to figure out :(

I have 6 numbers randomly generated at the same time whose min and max will always be between 1 and 19, though the min may be higher and the max may...

• Replies: 1
• Views: 923
06-18-2012, 06:12 PM
24. ### Which distribution to use?

I think we should use the exponential distribution - can you confirm if I am right: A light bulb manufacturer advertises that "the average life of...

• Replies: 0
• Views: 2,326
06-17-2012, 12:46 PM
25. ### Joint distribution ... Help!

I have 1 previous exam sample question: (X,Y) has the following joint probability density function f(x,y)= 3(x+y) when ...

• Replies: 1
• Views: 1,637
BGM
06-16-2012, 12:19 PM
26. ### Probability from Z-score for a given population?

Hi there, Apologies in advance for my lack of stats knowledge. We are using some predictive models that do assume a normal distribution but...

• Replies: 0
• Views: 1,386
06-16-2012, 01:48 AM
27. ### Hypergeometric distribution - expected value derivation

Hello, I just had a question regarding deriving the expected value of the Hypergeometric(N,M,n) distribution. I know that the expected value is...

• Replies: 3
• Views: 4,450
06-16-2012, 01:30 AM
28. ### Probability Help.

Im not sure why I can't figure out these 2 problems. I got the first one right, and I'm using the same thought process to do the other 2, I just...

• Replies: 8
• Views: 10,486
06-15-2012, 06:22 PM
29. ### expectation of the distance between two points in a square

Hi all, how can I find the expectation of the distance between any two points uniformly distributed in a square of side L. I need a mathematical...

• Replies: 1
• Views: 3,758
BGM
06-15-2012, 05:17 PM
30. ### Mixed continuous / discrete probability question

Dear forum, I am having a dreadful time making progress with the following problem, and would greatly appreciate any pointers you had. The...

• Replies: 1
• Views: 1,607
BGM
06-14-2012, 05:02 PM
31. ### Conditional expectation

Good afternoon, I have to calculate the expected value of a logistic distribution given that the values are above a given constant (lets say 0). So...

• Replies: 1
• Views: 3,910
BGM
06-14-2012, 04:58 PM
32. ### Birthday Problem

This is not the traditional birthday problem. Lets say I have 657 friends. What are the odds that none of them have a birthday today? This...

• Replies: 3
• Views: 1,788
06-13-2012, 09:00 PM
33. ### Related Failures

I need help classifying this problem. If you know how to go about it, I'd love to hear it, but I mainly need keywords to conduct careful research. ...

• Replies: 1
• Views: 1,719
06-11-2012, 11:29 AM
34. ### Help with Exponential Dist Problem.

I'm questioning whether to use PDF or CDF for the following problem. The time in days between breakdowns of a machine is exponentially distributed...

• Replies: 3
• Views: 3,062
06-10-2012, 09:17 PM
35. ### Poisson distribution- when lambda given as a %

Hello! I'm new to this forum, and let me tell ya, stats as a summer class is not fun! Anyways, I think I know the answer to my question, but I...

• Replies: 4
• Views: 3,461
06-10-2012, 08:54 PM
36. ### Probabilities and variable Z

The question was asked... For standard normal random variable Z, find the following probability P(Z=0.74). I looked in my book's table and found...

• Replies: 4
• Views: 7,289
06-10-2012, 05:31 PM
37. ### poisson question

OK here is an exercise that i don't understand how to solve: imagine a balcony that attends client. For every 10 min. the number of people getting...

• Replies: 1
• Views: 1,535
06-10-2012, 12:20 PM
38. ### Basic Probability Question

If I have the following data set, Event - Failure Frequency (failures/yr) 1 - 0.12 2 - 0.50 3 - 0.50 4 - 0.29 5 -...

• Replies: 0
• Views: 1,315
06-06-2012, 06:16 PM
39. ### Formula for determining # times to repeat an event to get Y % probability of success

OK, I know, the title leaves a lot to be desired but it's the best I could do in the space allowed. It's been a while since I did any statistics,...

• Replies: 2
• Views: 1,767
06-05-2012, 04:16 PM
40. ### Adding normal distribution - z-scores

Hi - I have a quick question. I understand that the sum of two normal distributions is a normal distribution. Now let's say I have the z-score...

• Replies: 5
• Views: 8,549
06-05-2012, 09:21 AM
41. ### Using a copula function when one of the correlations is not significant

Hello, I have 4 variables: 1. Departure Time from Home 2. Distance travelled during the day 3. The number of trips made during the day 4....

• Replies: 4
• Views: 2,320
06-05-2012, 04:07 AM
42. ### Distribution of |X|/|Y|

Hello I would like some help on this question: a)If X and Y are independent r.v.'s N(0,1) find the pdf of |X|/|Y|. My problem is working with...

• Replies: 1
• Views: 2,178
06-02-2012, 04:59 PM
43. ### hypothesis testing: car top speed vs two aerodynamic configurations

but varying wind speed confounds results. I'm looking for a significant difference between designs. What keywords should I be searching on for...

• Replies: 3
• Views: 1,973
06-02-2012, 10:57 AM
44. ### help with binomial distribution

Hello, I have a problem with this binomial question..I will try to make it short a machine makes on average 1 error per hour and needs to be...

• Replies: 0
• Views: 1,369
06-01-2012, 04:28 PM
45. ### Larger Probability

Hello all. I just have a question regarding larger probabilities. Small probabilities I understand are fairly straight forward: Eg: 65% of...

• Replies: 2
• Views: 2,355
06-01-2012, 02:43 PM
46. ### I need helpf with this one, for probability - binomial distribution

According to a recent study, 38% of all women will suffer a hip fracture because of osteoporosis by the age of 85. If six women aged 85 are randomly...

• Replies: 4
• Views: 8,578
06-01-2012, 12:04 PM
47. ### Bayesian inference

Hello, I am having trouble understanding Bayesian inference (all those parameters, data, prior/posterior distributions). It's all a little bit...

• Replies: 0
• Views: 2,154
05-31-2012, 03:07 PM
48. ### Exponential or Lognormal: which distribution should I use?

Hi! Which distribution should I use if my set of data is divided into subgroups and each subgroup is either lognormal or exponential? Please help,...

• Replies: 0
• Views: 4,207
05-30-2012, 05:38 AM

Can someone give some tips to prove the statement: C and D are two sets. If C belongs to D, then \sigma(C) belongs to \sigma(D). where...

• Replies: 1
• Views: 1,652
05-30-2012, 05:17 AM
50. ### Is independence indpendent on measure?

Is it possible that 2 sigma-algebras could be independent under one measure but not independent under another? Many thanks.

• Replies: 5
• Views: 1,979
05-25-2012, 04:16 PM
51. ### Why is a Dynkin system not a Pi-system?

This appears to be the only difference between a sigma-algebra and a Dynkin system: Sigma-algebra is closed under countable union Dynkin system...

• Replies: 0
• Views: 1,602
05-25-2012, 08:59 AM
52. ### Basic Question

Ok the answer might be really obvious here but I am getting a blank at the moment. If there is a 20% chance of a child getting a disease from...

• Replies: 2
• Views: 1,474
05-25-2012, 12:23 AM
53. ### Probability of winning analysing combinations

Hello, this is my first post in this forum, so I’m not sure if this question belongs to this topic. Well, here goes my problem: I have to know the...

• Replies: 0
• Views: 1,235
05-20-2012, 09:01 PM
54. ### Probability on 2 random events combined

event A and B are not related but : if A happens then the event C has a probability W of happening. if B happens then the event C has a probability...

• Replies: 2
• Views: 2,113
05-19-2012, 05:12 AM
55. ### expectation and integral

Hi maybe a stupid question: Let X be a random variable depending on a parameter \xi . Further let f : \mathbb{R} \rightarrow \mathbb{R} be a...

• Replies: 4
• Views: 2,284
05-18-2012, 02:05 PM

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