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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: 30,330
09-30-2005, 09:44 AM
1. ### Determining number of samples to collect

Hi, I am doing a project in determining if there is a statistically significant difference between conducting a particular type of cleaning process...

• Replies: 1
• Views: 3,520
08-03-2010, 12:11 PM
2. ### Determining on Probability from multiplt associative probabilities

Hi, I have a question regarding the associative laws of probabilty. Basic question is that I need to find the probability of a player X...

• Replies: 0
• Views: 1,116
03-24-2012, 12:09 AM
3. ### Determining p-values, significant cutoffs and false discovery in non-normal data

Hi, I have a set of data points from a genetic study. I wish to ascertain which of these data points is statistically significant. The data is not...

• Replies: 2
• Views: 1,330
06-21-2013, 12:03 PM
4. ### determining the most probable permutation of a set

Is there any way to determine the most probable permutation of any given set? For example, given the set of letters SKTANH, is there a way to compute...

• Replies: 2
• Views: 162
09-30-2017, 02:37 PM
5. ### 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: 1,024
06-27-2012, 09:29 AM
6. ### Determining the probability that two data sources are the same

I've been looking for the answer to this problem for a while now and I think a large part of it is that I don't know how to frame the question. Here...

• Replies: 5
• Views: 2,018
05-10-2013, 03:50 AM
7. ### Determining the test to be applied

Find the 96% confidence limits for the true mean weekly study time of students if a sample of 25 had an average of 20 hrs per week and a sd of 3 hrs.

• Replies: 3
• Views: 1,757
11-22-2006, 11:20 AM
8. ### Dice and Don't Cares

Hi. I'm working on deriving a probability formula to help in some research I'm doing, but I've hit a wall. I've managed to reduce my problem down...

• Replies: 3
• Views: 1,969
BGM
10-17-2011, 08:19 AM
9. ### dice prob. of sum

I have a question about a probability of sum in dices. lets say its a dice with 20 or more sides. for normal dice i just write for each sum of 2...

• Replies: 4
• Views: 1,985
04-20-2012, 02:49 AM
10. ### Dice probability

Hello people, I have a very simple probability question that I need to solve a problem (recreational mathematics). Anyway, I would like to know how...

• Replies: 3
• Views: 2,013
BGM
09-08-2011, 11:52 AM
11. ### dice probability

• Replies: 5
• Views: 1,661
04-13-2012, 05:01 AM
12. ### Dice Probability (2d6, 3d6, 4d6)

I would like to find the probabilities of rolling a result using different numbers of six-sided dice. I am looking for the best way to figure out the...

• Replies: 2
• Views: 6,004
BGM
05-10-2014, 12:50 AM
13. ### Dice Probability (Yahtzee Related)

hi, I am currently doing my Computer Science Dissertation and it it to create a program that can play Yahtzee. My planning involves lots of...

• Replies: 1
• Views: 9,106
10-16-2007, 02:28 PM
14. ### Dice probability - at least 2 's out of ten

Hi If I roll a fair dice 10 times, what is the probability of getting at least two 6's? edit: Which method shall I use? Say, it's at least 3...

• Replies: 1
• Views: 10,292
12-17-2008, 09:23 PM
15. ### dice probability question

I have a game that requires rolling 16 sided dice numbered 0-15. I would like to know the probability of rolling a sum of less then 20 using four...

• Replies: 0
• Views: 2,799
11-27-2007, 11:23 PM
16. ### Dice probability question

What are the odds of rolling 2d6(2 6-sided dice) three times and getting two 3s? How about rolling 4 times; 5 times? I know rolling a 2d6 has a...

• Replies: 1
• Views: 1,090
04-30-2016, 01:36 PM
17. ### Dice probability question - Settlers of Catan

Hello everyone, Let me begin by saying that this isn't a homework question. Rather, this is a question that relates to a personal inquiry into...

• Replies: 3
• Views: 4,762
BGM
12-07-2013, 06:40 AM
18. ### Dice probability with limited reroll

Hello, I'm having difficulty understanding this problem and I was wondering if someone had an answer. Let n = \text{Number of dice} = 3 p_s...

• Replies: 2
• Views: 1,618
03-23-2016, 12:13 PM
19. ### Dice Probablility

I'm setting up a dice game. I'll try to keep its mechanics as simple as possible. You roll a six sided die, then you can choose to roll more...

• Replies: 1
• Views: 2,172
01-21-2009, 09:03 AM
20. ### Dice Problem

Hi there, There's a the problem I've been trying to solve for the past two days. I have 5 dice, each with a different number of sides. Dice A:...

• Replies: 2
• Views: 1,986
05-02-2013, 05:46 PM
21. ### Dice Question

Hey folks, this is a question i'm trying to solve: You roll a die, winning $1 for rolling a 2 or a 4, and$7 for a 6. You lose \$2 if the number...

• Replies: 1
• Views: 2,147
07-07-2009, 12:39 PM
22. ### Dice roll

Sorry if this topic has been discussed before. I hate looking through forums randomly for an answer to a question. So, maybe one of you could help...

• Replies: 6
• Views: 2,631
08-29-2008, 10:21 PM
23. ### Dice Roll Game Probabilities

Hello everyone, I have a bit of a probability question for you as it has been quite awhile since I have been in school, and I can’t remember the...

• Replies: 3
• Views: 1,985
BGM
10-13-2013, 01:36 PM

Suppose you have a FIVE sided dice. One of the sides has a star on it, the other four sides are blank. Suppose you rolled it 10 times. What are the...

• Replies: 1
• Views: 1,249
05-06-2015, 08:38 PM
25. ### Dice Throwing

2 dice thrown together for 3 times, what is the probability that for any of the 3 throws, I will get the same number on both dice? Thx ! Andrew

• Replies: 1
• Views: 3,375
12-16-2010, 08:56 AM
26. ### Dice Total Odds Calculator

I have posted a calculator to the Google Play Store for computing the probability of obtaing a particular sum when throwing dice:...

• Replies: 0
• Views: 1,752
01-29-2017, 06:32 PM
27. ### Die probabilistic

i am reading Mostellers book on 50 difficult probability questions. the question I am struggling with is on the average, how many times must a die be...

• Replies: 8
• Views: 1,957
08-02-2012, 04:57 PM
28. ### die probability

Two fair dices are thrown and you are told that the sum of upturned face is equal to 7.what is the probabilty that neither face os equal to 6??is it...

• Replies: 0
• Views: 1,899
05-04-2009, 05:55 AM
29. ### Die throwing competition, probability of winning

Suppose a friend and I are playing a game with a fair die. We throw alternatively and whoever rolls a 6 first wins. I get to roll first. What is the...

• Replies: 9
• Views: 2,541
02-26-2013, 08:16 PM
30. ### Die throwing game

A fair die is thrown a number of times and every time we count the number of dots (cumulative), until the total number of dots is bigger than or...

• Replies: 7
• Views: 4,826
09-10-2010, 02:37 PM
31. ### Difference between binary logistic regression analyses and multivariate regression

I am new to this forum, hope this is in the correct placce. Can someone explain the difference between these two?

• Replies: 1
• Views: 3,104
04-06-2013, 09:09 PM
32. ### difference between binomial exact test and fisher's exact test

Hello all, So I know the general difference between these tests --binomial exact test is used to test for a significant difference between and...

• Replies: 1
• Views: 18,463
01-31-2012, 11:04 AM
33. ### Difference between likelihood and the posterior probability (bayesian statistics)

Hello everyone. I am having a little bit of trouble wrapping my head around the difference between the likelihood and the posterior probability in a...

• Replies: 4
• Views: 9,541
04-15-2013, 08:12 AM
34. ### Difference between mean and expected value

Could someone please explain as simply as possible the difference between mean and expected value? Here is my problem: This is for my math stats...

• Replies: 2
• Views: 4,646
12-07-2013, 11:06 AM
35. ### Difference between p(y=0|x=0) and p(x=0,y=0)

Another Trivial question: I have been asked to calculate the joint probability i.e. p(X=0,Y=0) and i have been provided by P(Y=0|X=0), is it the...

• Replies: 1
• Views: 1,475
10-06-2013, 10:18 PM
36. ### Difference between probability of an individual and of a population?

Im a little confused as to finding the probability of an individual to a population. My answers don't look correct. Could anyone help me out? A...

• Replies: 1
• Views: 2,146
10-12-2013, 12:27 AM
37. ### Difference between two Normal Distributions

I have a problem where I have two Normal distributions both with a standard deviation of 20 and a difference between the means of 17. I want to work...

• Replies: 0
• Views: 8,071
06-13-2006, 10:41 AM
38. ### 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: 1,440
BGM
10-09-2014, 04:23 AM
39. ### difference of two independent Poisson random variables

Why the difference of two independent Poisson random variables doesn't have Poisson distribution? Demonstrate it.

• Replies: 6
• Views: 4,074
02-13-2015, 11:50 AM
40. ### Difference powerlaw, lognormal and streteched exponential (Weibull) function

I am currently fitting above mentioned functions to my data and I can observe, that both lognormal and Weibull are better fits than powerlaw. In...

• Replies: 2
• Views: 2,722
10-08-2013, 07:40 AM
41. ### differences between one-tailed and two-tailed P-value

I am doing hypothesis testing using t-test and p-value. I calculate my p-value based on the degrees of freedom and the t-test value. The p-value is a...

• Replies: 9
• Views: 12,073
04-12-2010, 09:51 PM
42. ### Differences of proportions

Please forgive what I assume is the simplicity of these related problems, but I don't seem to find the solution elsewhere. 1) 2 cards are...

• Replies: 0
• Views: 1,511
05-16-2016, 08:52 AM
43. ### Different arrangments of n 0's and m 1's

This simply stated problem is giving me some trouble: How many different ways can I arrange n 0's and m 1's? Perhaps someone would direct me...

• Replies: 5
• Views: 1,667
06-06-2013, 05:54 AM
44. ### Different between "X % more likely" vs. "X times more likely"

I often see something like "smokers are 10% more likely to get cancer than non-smokers." Is this equivalent to saying smokers are "10 times more...

• Replies: 0
• Views: 28,884
09-21-2011, 10:25 PM
45. ### Different Interpretations of the Central Limit Theorem

My friend and I are having an argument about the meaning of CLT. It led to me build this javascript experiment which you may enjoy:...

• Replies: 2
• Views: 3,492
06-18-2013, 07:33 PM
46. ### Different solutions when using direct calculation and Chebychev's inequality

Hi all, I have a question that I can't find answer to: I have 10 random variables X1, X2....X10 which are all independent and exponentially...

• Replies: 1
• Views: 1,965
02-23-2017, 06:05 PM
47. ### Difficult Integral standard normal pdf/cdf

I would like to get an explicit analytical form for the integral (below)...or something close to it with an associated (small) error term. (Note that...

• Replies: 17
• Views: 13,945
BGM
05-31-2010, 09:35 AM
48. ### Difficult probability question

Hi - I'm really stuck with this question. I can't find any example quite like it anywhere: Two friends, Ben and Jerry, agree to a random swap of...

• Replies: 5
• Views: 3,289
10-28-2011, 11:42 AM
49. ### Difficult probability question

I've gotten this off another forum (it hasn't been solved yet), and thought you guys might enjoy this problem. I don't need it solved as it's not my...

• Replies: 7
• Views: 1,892
08-09-2012, 10:20 AM
50. ### Difficulty correlating terminology with symbols.

The book we are using for this class uses words instead of the symbols in some of the homework problems we are using. My question is: Is P(A...

• Replies: 2
• Views: 5,156
02-17-2006, 12:11 PM
51. ### Difficulty setting up double integrals for Joint Distributions

I'm struggling to set up the correct range when calculating probabilities of joint distributions....anyone have any recommended reading or sites that...

• Replies: 16
• Views: 9,028
09-30-2012, 03:24 AM

What statisics to I need to use work out the probability of seeing a dolphin given that it has been seen before? i.e. If it was seen once, will it...

• Replies: 1
• Views: 2,499
03-28-2010, 06:25 PM
53. ### Dirichlet distribution

I computed mean, variance and covariance of the Dirichlet distribution. To do so, I computed E, E and E. This is the first time I've dealt with...

• Replies: 2
• Views: 1,422
07-07-2013, 07:01 AM
54. ### Dirichlet distribution - moments (mean and variance)

For a Dirichlet variable, I know the means and covariances, that is, E = \alpha_i/\alpha_0 Cov =\frac{ \alpha_i (\alpha_0 I -...

• Replies: 12
• Views: 11,821
02-14-2012, 10:56 AM
55. ### discrepancy between summed binomial probability and expected value

Hi all. Im writing a program to calculate statistics for a tabletop game, and I'm confused by a discrepancy between a calculated expected value...

• Replies: 1
• Views: 2,733
BGM
06-11-2010, 12:35 PM

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