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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: 31,159
09-30-2005, 09:44 AM
1. ### Convergence in Probability

Hello all. I have a two statements. One says -\frac{1}{T} \sum_{t=1}^T X_t \rightarrow a in probability as T \rightarrow \infty The...

• Replies: 2
• Views: 1,545
10-13-2014, 04:10 PM
2. ### Simple Bernoulli question

I am sort of baffled by this. The point is to simulate how often students will be right when guessing on a multiple choice tests with 5 responses. It...

• Replies: 13
• Views: 3,588
10-13-2014, 03:24 PM
3. ### Drwaing the probability distribution of the population from a sample

Hey there, this might be a bit of an uneducated question, but I want to make sure I don't get anything wrong. I'm wondering if one can draw...

• Replies: 1
• Views: 1,287
BGM
10-13-2014, 01:08 PM

Consider an experiment where we roll a single die once and let X represent the number of dots that appear on the top face of the die. Suppose that...

• Replies: 8
• Views: 2,699
10-12-2014, 11:19 AM
5. ### Simple but quite confusing Problem

Hi all, I'm solving the problems in probability but, the question below looks simple but quite confusing to me. Regarding question 2-(c), any...

• Replies: 1
• Views: 1,667
BGM
10-12-2014, 10:49 AM
6. ### Negative Binomial Distribution

Hi, Regards

• Replies: 0
• Views: 1,684
10-12-2014, 08:54 AM
7. ### Probability theory: The Quantum Measurement Problem

There is a famous double-slit experiment in Quantum Mechanics that attempted to measure whether electrons and photons are comprised of particles or...

• Replies: 2
• Views: 3,201
10-10-2014, 08:29 AM
8. ### probability question

Five cards are dealt at random and without replacement from a standard deck of 52 cards. What is the probability that the hand contains all 4 aces if...

• Replies: 0
• Views: 4,894
10-09-2014, 02:09 PM
9. ### Difference of expectations of RV's given arbtrary pdfs

I've been beating my head on this for a while... Let X and Y have pdf's f & g respectively such that \begin{cases} f(x) >= g(x) & \mbox{if } x...

• Replies: 1
• Views: 1,627
BGM
10-09-2014, 04:23 AM
10. ### Probability that X restaurants will be visited if Y people choose independently

I am trying to determine for Y people selecting from X restaurants (with an equal probability) what the expected value of the number of restaurants...

• Replies: 2
• Views: 2,039
JPC
10-08-2014, 07:37 AM
11. ### Prob: Normal probability distribution

The mean cost of domestic airfares in the United States rose to an all-time high of \$385 per ticket (Bureau of Transportation Statistics website,...

• Replies: 1
• Views: 11,491
10-07-2014, 07:39 PM
12. ### two normal distributions

the post no longer relevant - outdated

• Replies: 0
• Views: 2,161
10-06-2014, 06:17 PM
13. ### inverse of the students t-distribution

Hi All, I am trying to use calculate for two-tailed inverse of the students t-distribution function presented by Excel functions like...

• Replies: 3
• Views: 1,872
10-03-2014, 12:27 PM
14. ### Mean/Var for Loss rate given Loss and Balance

We have a variable X (Loss Dollars) with known Mean and Stdev, and variable Y (Balance) with known Mean and Stdev. Let’s also assume we know the...

• Replies: 0
• Views: 1,484
10-02-2014, 09:38 AM
15. ### Process Control

Hi, Could anyone help me with a statistical process control problem i have? I am measuring a process which gives a measured value range from 0...

• Replies: 7
• Views: 2,650
10-01-2014, 09:34 AM
16. ### inverse of the students t-distribution

Dear All, I have a issue about two-tailed inverse of the students t-distribution. I am trying to use calculation for two-tailed inverse of the...

• Replies: 0
• Views: 1,373
10-01-2014, 05:52 AM
17. ### How to calculate variance of binomial variable where base (n) is binomial also

Hi I have a survey that collects data from each respondent on gender and also on attitudes. We don't know in advance how many men or women will...

• Replies: 0
• Views: 1,336
10-01-2014, 02:46 AM
18. ### Identify Statistically Significant Data Point when Mean/Variance Unknown

I am conducting a screen of a wide range of compounds and generating measurements for their effect on a protein. We have conducted some work on...

• Replies: 0
• Views: 2,459
09-30-2014, 05:11 AM
19. ### probability density function

I am having difficulty resolving the two exercises below 1)Consider the function Find the E(X). I now is a Poisson(y), but i don't know how to...

• Replies: 0
• Views: 1,324
09-28-2014, 04:00 PM
20. ### Probability of winning an n-game series

With the baseball playoffs coming up, I was fiddling around with how to calculate the probability that one team would win a playoff series, given P,...

• Replies: 3
• Views: 3,417
BGM
09-28-2014, 03:48 PM

A study undertaken by the Miami-Dade Supervisor of Elections in 2002 revealed that 44% of registered voters are Democrats, 37% are Republicans, and...

• Replies: 2
• Views: 4,397
09-26-2014, 04:20 AM
22. ### Expected Value & Variance from Z = min (X,Y)

Dear all, I have an assignment, but I don't understand yet which formulas I have to use to solve it. Here is the question: There is an...

• Replies: 1
• Views: 5,165
BGM
09-24-2014, 03:48 AM
23. ### 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: 2,928
09-22-2014, 01:26 PM
24. ### 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: 4,793
09-21-2014, 08:59 PM
25. ### 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: 1,114
09-21-2014, 01:35 PM
26. ### 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: 1,898
09-17-2014, 12:54 AM
27. ### 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: 2,776
09-16-2014, 03:59 PM
28. ### 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: 1,069
09-16-2014, 05:24 AM
29. ### 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: 3,340
09-08-2014, 11:43 PM
30. ### 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: 1,089
09-08-2014, 02:50 PM
31. ### 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: 1,306
09-08-2014, 10:59 AM
32. ### 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: 3,663
09-04-2014, 10:14 PM
33. ### 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: 1,327
09-04-2014, 05:12 AM
34. ### probability poisson distributed

hi can somebody help me with this question please.

• Replies: 5
• Views: 2,283
09-01-2014, 10:25 AM
35. ### 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: 3,820
08-29-2014, 04:17 PM
36. ### 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: 6,955
08-29-2014, 11:10 AM
37. ### 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: 1,432
BGM
08-29-2014, 03:47 AM
38. ### 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: 1,516
08-28-2014, 07:01 PM
39. ### 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: 1,398
08-28-2014, 10:15 AM
40. ### 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: 2,189
BGM
08-22-2014, 12:25 PM
41. ### 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: 2,506
08-14-2014, 01:52 PM
42. ### 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: 1,491
08-13-2014, 12:35 PM
43. ### 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: 991
BGM
08-13-2014, 07:28 AM
44. ### 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: 2,927
BGM
08-10-2014, 05:09 AM
45. ### 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: 989
BGM
08-10-2014, 04:47 AM
46. ### 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: 1,646
08-08-2014, 11:20 AM
47. ### 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: 1,754
08-08-2014, 07:38 AM
48. ### 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: 2,763
08-07-2014, 12:08 PM
49. ### 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: 1,178
08-06-2014, 10:54 AM
50. ### 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: 2,033
08-05-2014, 12:51 PM

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