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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: 11,029
09-30-2005, 09:44 AM
1. Need help with geometric pmf

Hi all, Here's the problem: Let X be the number of accidents per week in a factory. Let the probability mass function of X be f(x) = 1/(x+1) -...

• Replies: 2
• Views: 70
Today, 01:26 PM
2. simulating correlated, non-normal data: WHY DOES THIS HAPPEN!?

i have been experimenting with different methods to generate correlated, non-normal data for comprehensive-exam purposes and i'm finding something i...

• Replies: 21
• Views: 336
Yesterday, 08:59 PM
3. Comparing proportions

Hello there: I have a couple of questions about comparing proportions. 1) why do we use a z-test to compare proportions but t-test to compare...

• Replies: 0
• Views: 56
Yesterday, 01:35 PM
4. Homework help with conditional probability distribution

Hi, I was wondering if I could get some help with this homework problem. We are given that X~U(0,1) and conditional distribution of Y|X=x is...

• Replies: 1
• Views: 151
09-17-2014, 12:54 AM
5. Astronomer's estimate

I am trying to solve the problem but end up with no where, Please help me to solve the problem Astronomers estimate that as many as one hundred...

• Replies: 3
• Views: 143
09-16-2014, 03:59 PM
6. Tricky probability problem

Hi, I was wondering if you could help me out with a problem I have: I need to work out the probability that someone will be able to complete a...

• Replies: 1
• Views: 122
09-16-2014, 05:24 AM
7. Brain Teaser

It's here:http://www.braingle.com/palm/teaser.php?id=29228&comm=1 I thought that surely the answer must be 0.5 until I considered writing a test...

• Replies: 11
• Views: 410
09-08-2014, 11:43 PM
8. Probability of Unconventional Food Item Alleviating Medical Problem Multiple Times

For about 2 years, a medical problem has more or less repeated, as follows: The problem normally lasts approximately 3 weeks and then goes away...

• Replies: 0
• Views: 83
09-08-2014, 02:50 PM
9. Mathematical intuition for variance

One explanation to "Why do we square the deviations" is.. "The sum of the square deviations of any set of observations from their mean is the...

• Replies: 1
• Views: 79
09-08-2014, 10:59 AM
10. if z-value is a negative number, how can i calculate the Probability?

Hello guys, :) I have an important question I want to ask. I have already searched the web and my statistics book but I can not find the answer :(...

• Replies: 2
• Views: 188
09-04-2014, 10:14 PM
11. My article on runs testing random bit sequences

The article is here: http://home.ptd.net/~artnpeg For smaller values of the mean, the Poisson Distribution with cumulative sums is used. For larger...

• Replies: 0
• Views: 116
09-04-2014, 05:12 AM
12. probability poisson distributed

hi can somebody help me with this question please.

• Replies: 5
• Views: 489
09-01-2014, 10:25 AM
13. Non central Chi square distribution and approximations Matlab

Hello! I have a problem with the computation of a chi squared distribution in Matlab. I have a quadratic form : y' Px y, this form has a non...

• Replies: 3
• Views: 189
08-29-2014, 04:17 PM
14. Traffic light probability question.Need help!!

Hi, Need help to solve this probability question. At a certain traffic signal red for 30 seconds, yellow for 5 seconds, and green for 25 seconds....

• Replies: 2
• Views: 217
08-29-2014, 11:10 AM
15. Computing probability

fX(x)= (3/8)*x*x 0<x<2 fY(y)= 1/x x<y<2x P(1<y<3) Now how do i do this ? Do i have...

• Replies: 1
• Views: 165
BGM
08-29-2014, 03:47 AM
16. Drawing variates from this density function

Hi, I have derived the following probability density function, which I would like to draw random variates from as part of a Gibbs sampling step: ...

• Replies: 2
• Views: 152
08-28-2014, 07:01 PM
17. Poisson proces and binomial

I'm trying to find the distribution of the number Y of arrivals in the timeinterval \subset where X(t) is number of arrivals in a poissonproces...

• Replies: 2
• Views: 106
08-28-2014, 10:15 AM
18. second order stochastic dominance for convex functions

Hi, To gain better understanding of second-order stochastic dominance I am trying to replicate some basic proofs. The proof of `standard' SSD...

• Replies: 1
• Views: 132
BGM
08-22-2014, 12:25 PM
19. Probability that Bernoulli p-parameter is greater than some value, given N samples?

Hello everybody, I have the following question. Assume I observe N outcomes from a Bernoulli random variable with unknown success parameter p....

• Replies: 5
• Views: 262
08-14-2014, 01:52 PM
20. Multi-level Bayes

I guess that this is a multi level Bayes problem but there maybe a better technical name for it that I am not aware. Three jars contain tokens of...

• Replies: 2
• Views: 156
08-13-2014, 12:35 PM
21. exponential and deterministic random variable mix

Assume that there is a Poisson random process which has a rate of λ that produce samples which has an exponentially distributed inter-arrival times,...

• Replies: 3
• Views: 220
BGM
08-13-2014, 07:28 AM
22. Set Completion Problem for a Set of Collectable Objects

I'm trying to do some probability analysis for a digital collectable game called SolForge. There is a particular point in my analysis where I'm not...

• Replies: 8
• Views: 234
BGM
08-10-2014, 05:09 AM
23. Given an Average for Drawing 6 Times, What Are the Odds When Drawing Once?

Suppose we draw 6 times, with replacement, from a deck of cards with four suits. We do not know how many cards of each suit there are, nor how many...

• Replies: 1
• Views: 147
BGM
08-10-2014, 04:47 AM
24. Statistically different tops for 2 parabolas with non-normal distributed data

For situation 1 and 2 from my data came two parabola relations between variables X and Y. (the two parabolas have both a maximum) My question is...

• Replies: 8
• Views: 416
08-08-2014, 11:20 AM
25. a question about discrete RV

hello, I have a question about discrete RV. Five fair coins are tossed. The coins that fall on "Head" are removed and the rest of them are tossed...

• Replies: 11
• Views: 262
08-08-2014, 07:38 AM
26. Drawing tokens from a bag - probability of getting 2(a) out of 3 draws

EDIT: Please see my last post for my latest revelation/question regarding this problem! Hi all, first time poster here... I'm creating a...

• Replies: 3
• Views: 209
08-07-2014, 12:08 PM
27. Ploting Positions from Peak Over Thresold Series

Hello. I have a little confusing with some aspect related to the Peak Over Thresold Series and differencing the methodology of analysis from that...

• Replies: 0
• Views: 96
08-06-2014, 10:54 AM
28. Building confidence intervals using Coefficient of variation

Hi I have a doubt and i need to understand it. At my work, my colleagues use the coefficient of variation for doing confidence intervals. Not...

• Replies: 7
• Views: 227
08-05-2014, 12:51 PM
29. Looking for an elegant mathematical expression

Hi to you all, i am new at this forum and i am glad there is such. Problem description suppose i am playing two seperate games (independently!)...

• Replies: 2
• Views: 163
BGM
07-31-2014, 02:46 AM

I thought I understood sampling without replacement fairly well, but this problem has me stumped as the answer that I calculate doesn't appear to be...

• Replies: 2
• Views: 193
07-29-2014, 07:29 PM
31. Logistic Regression Problem

Hi! My collegue is developing a logistic regression to predict the probability of a customer taking up a particular credit card. Let's call...

• Replies: 5
• Views: 348
07-28-2014, 09:57 AM
32. Number serviceable at given time

If I have 50 systems each operating 400 hours per year with an MTBF of 900 hours how do I calculate how many would be serviceable at one time?...

• Replies: 12
• Views: 334
07-28-2014, 08:40 AM
33. Question about well-suited poker hand

Hi, I have the following question: A peculiar deck of playing cards is like a regular deck, but has five suits: spades, hearts, diamonds, clubs,...

• Replies: 2
• Views: 249
07-27-2014, 09:26 AM
34. Probability of sequences having 1-4 distinct numbers

This is more of combinations problem, but I need to count the number of ways in order to get the probabilities. I would like to find the number...

• Replies: 1
• Views: 159
07-27-2014, 02:43 AM
35. Stochastic Integral

Hi there, I created an account here trying to get some help on my problem. I'm really desperate as I'm going to need this for my work on my...

• Replies: 4
• Views: 327
07-23-2014, 06:34 PM
36. Probability based on multiple pieces of information

It's been about 20 year since my last stats class and I'm working on a fun little side project that involves some probability. I'm having some...

• Replies: 9
• Views: 339
07-22-2014, 12:57 PM
37. Normal and standard distribution question

I have X \sim N(0,1) and Y \sim N(\mu,\sigma^2) Apparently then Y =\sigma X + \mu I can't quite see how, and can't find anything on the...

• Replies: 6
• Views: 387
07-21-2014, 11:47 AM
38. Group Assortment Measure

Hi I need a formula that returns a value representative of the amount of ‘assortment’ a group shows. The groups are made up of individuals, all of a...

• Replies: 0
• Views: 160
07-19-2014, 10:53 AM
39. PDF of (nearly) collinear variables

My question is motivated by a problem with estimation by maximum likelihood. In simple terms, I want to estimate a parameter \beta and have three...

• Replies: 1
• Views: 193
BGM
07-18-2014, 10:46 AM
40. Probability of a sequence....

HI Folks, New to the forum. It's nice to find a forum in this area. I hope someone can help me out. My goal is to determine if it is possible to...

• Replies: 5
• Views: 458
07-12-2014, 06:41 PM
41. Need some help with probability and dice

Hi guys, I'm making a board game and ran into some probability problems with dice. I use custom dice (green, blue, red, and yellow). The same...

• Replies: 3
• Views: 289
BGM
07-10-2014, 03:10 AM
42. Exam Question / need help

3-Suppose that you are in charge of marketing airline seats for a major airline company. Four days before the flight you have 12 seats remaining on...

• Replies: 2
• Views: 335
07-09-2014, 03:15 PM
43. How do you calculate and relate odds from two different experiments?

a) Lets say I have a sack with 119 white balls and 1 black one. Pw=119/120 almost 99.17 % b) A guy called John comes and pick randomly picks a...

• Replies: 0
• Views: 213
07-08-2014, 04:27 PM
44. Uniform Distribution - probabilities

Hi guys, I am trying to solve an exercise but it seems to bem somehow strange. It is an experiment where A believes that men are bigger than women...

• Replies: 2
• Views: 189
07-08-2014, 09:01 AM
45. IP probability question

hi guys. as you know, IP is a combination of 4 parts. every part is from 0-255, for example 234.32.135.7. now, my question is, what is the...

• Replies: 6
• Views: 464
07-08-2014, 07:12 AM
46. Would love some assistance with understanding this puzzling probability "game"

Hello everyone, This is my first post here, so please be gentle :). I'd like to thank everyone in advance for any help that can be given. ...

• Replies: 3
• Views: 332
07-05-2014, 06:18 PM
47. Probit regression - Interpretation of marginal effects of IVs in log/percentage form

Dear talkstats-community, I already spent hours on websearch for an answer on a question I have regarding the interpretation of marginal effects...

• Replies: 1
• Views: 246
07-04-2014, 10:56 AM
48. What are the chances?

Question: How many times must A occur in order for C to occur 3 times and D to occur once? Every time A occurs, there is a 1 in 2,500 chance that...

• Replies: 1
• Views: 292
07-02-2014, 05:58 AM
49. Binomial distribution ! Need help!

Hi, plz tell me if method to solve these question is correct or not! q)In a call centre 180 calls are received at random over a period of 12...

• Replies: 0
• Views: 252
06-28-2014, 11:05 AM
50. Poisson distribution!! Need help

Hi, Need help in solving few poisson distribution questions q)A dealer receives hard disks made by a certain manufacturer who on an average gives...

• Replies: 0
• Views: 142
06-28-2014, 10:59 AM
51. Probability and forward error correction by parallel transmission

I need a formula to express the probability of being able to correct single digit errors in a transmitted string of digits by transmitting the string...

• Replies: 0
• Views: 258
06-28-2014, 08:27 AM
52. Need help to solve Probability question!

Hi, Need help to solve this probability question! A supplier of company X makes on average 5 defective pieces.The company accepts a sample if...

• Replies: 0
• Views: 105
06-27-2014, 04:14 PM
53. Simple Probability Question

OK, so I am wondering about something and am not good with probability, but maybe someone here has the answer You have a die with only 4 sides,...

• Replies: 2
• Views: 378
06-25-2014, 11:03 AM

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