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Forum: Probability

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

  1. Arrow Sticky Thread 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)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 30,315
    09-30-2005, 09:44 AM Go to last post
  1. Question How do you calculate Skewness? Not the simple case...

    Hello, To begin with I would like you to take into account that I'm not a maths genius, but I understand maths to a good degree. My question is...

    Started by Harry Paraskeva‎, 07-06-2011 11:16 AM
    asymmetric, calculation, distribution, multimodal, skewness
    • Replies: 0
    • Views: 3,935
    07-06-2011, 11:16 AM Go to last post
  2. A complex cards off the top of a deck problem

    My question is what is the probability of drawing at least one ace and at least one king from the top of a standard deck of cards. This question...

    Started by MrMonday‎, 07-04-2011 05:19 PM
    • Replies: 3
    • Views: 3,152
    07-05-2011, 11:47 AM Go to last post
  3. Expected value and confidence interval for non-normally distributed discrete variable

    Greetings, Say I pull 11 random independent samples from a population and they take on the following values (assume that these are the only values...

    Started by John Reed‎, 07-04-2011 02:29 AM
    • Replies: 3
    • Views: 7,746
    07-04-2011, 02:35 PM Go to last post
  4. Probability of pulling a white ball out of a jar.

    Here is the problem that was given on the test: ----------------------------------------------------------------------------------- We have 3...

    Started by nered‎, 07-02-2011 02:26 PM
    • Replies: 2
    • Views: 3,743
    07-03-2011, 06:19 PM Go to last post
  5. help on to find probability density function

    hey guys, i am really confused on something.here is the thing: i have; i=x+(x^2-y)^(1/2) and here x is uniform...

    Started by Musa DemirtaƟ‎, 06-29-2011 07:58 PM
    • Replies: 6
    • Views: 3,156
    07-03-2011, 10:56 AM Go to last post
  6. Can someone confirm if i calculated this properly

    In a jar we have: 2 Big White Balls 4 Small White Balls 2 Big Black Balls 2 Small Black Balls Blindfolded we pick 2 balls out the jar.....

    Started by nered‎, 07-02-2011 02:44 PM
    • Replies: 4
    • Views: 2,160
    07-02-2011, 10:56 PM Go to last post
  7. Need help! Stuck on question

    Hey Guys, I need some help for this question: Bell Mobility, a wireless telephone carrier, had 44% of their customers with text messaging last...

    Started by john33‎, 07-01-2011 10:05 PM
    • Replies: 1
    • Views: 2,401
    07-02-2011, 05:51 PM Go to last post
  8. total demands in the next two weeks (normal distribution)

    Hi guys. Problem: The weekly demand for a product approximately has a normal distribution with mean 1,000 and standard deviation 200. The...

    Started by jwxie518‎, 06-29-2011 05:07 PM
    • Replies: 2
    • Views: 7,706
    06-30-2011, 01:14 AM Go to last post
  9. Looking for assistance with random prize probability among family

    Hello all, I signed up specifically in search for some assistance in a real world problem, hope that's alright. We have an application that...

    Started by akskier‎, 06-23-2011 01:14 AM
    • Replies: 7
    • Views: 2,939
    06-29-2011, 11:55 AM Go to last post
  10. Stuck on this

    The probability of an event happening is 20%. How many times would you have to do this to get an 80% chance of it happening at least 3 times?

    Started by ZachyT‎, 06-24-2011 12:22 PM
    • Replies: 5
    • Views: 2,289
    06-26-2011, 09:03 PM Go to last post
  11. Binomial random variable proof

    Hi guess, the question asks If X is a binomial random variable with parameters n, and P, where 0< p < 1, show that a) P(X=k+1) =...

    Started by jwxie518‎, 06-26-2011 05:52 PM
    • Replies: 2
    • Views: 3,510
    06-26-2011, 08:56 PM Go to last post
  12. Total Probaililty (both defective)

    Problem: I don't have the solution to this problem. I think the approach is to solve it by "total probability". P(DD) = P(I)*P(D | I)...

    Started by jwxie518‎, 06-21-2011 05:16 AM
    • Replies: 4
    • Views: 2,275
    06-26-2011, 05:32 PM Go to last post
  13. Correlated standard bivariate normal probabilities

    Hi, Suppose that X,Y are bivariate standard normal with correlation rho. I am interested in calculating P for arbitrary z. Clearly for rho=0...

    Started by MattS‎, 06-24-2011 04:42 PM
    • Replies: 0
    • Views: 2,363
    06-24-2011, 04:42 PM Go to last post
  14. need help.. really bad..

    1) Discrete random variable X is distributed whit definition: α is alfa P( X = k ) = α / 2^k k { 0, 1, 2, 3, 4 } ----------------------- a)...

    Started by nered‎, 06-24-2011 02:29 PM
    • Replies: 6
    • Views: 2,530
    06-24-2011, 04:13 PM Go to last post
  15. another question....

    In order for a device to work properly, part A should work, AND, at least one of parts B,D and F (see diagram). All parts are independent, and the...

    Started by Yankel‎, 06-23-2011 09:58 AM
    • Replies: 10
    • Views: 2,719
    06-24-2011, 08:01 AM Go to last post
  16. probability question

    a council of a town consist of 5 members: Member Gender 1 M 2 M 3 F 4 F 5 ...

    Started by Yankel‎, 06-23-2011 09:48 AM
    • Replies: 8
    • Views: 2,078
    06-24-2011, 07:56 AM Go to last post
  17. can't figure out the right formula!

    Hi everyone, I am taking a stats class and we are currently studying probability. I'm having issues with a question on the sample test as I simply...

    Started by soitgoes13‎, 06-23-2011 06:20 PM
    • Replies: 3
    • Views: 2,812
    06-23-2011, 07:12 PM Go to last post
  18. Prob. Question

    Hi, I have this question. A guy has to get to office early. There is a 40% chance he will wake late and 25% chance he will be stuck in traffic....

    Started by TransMogrifier‎, 06-21-2011 05:07 AM
    • Replies: 9
    • Views: 2,826
    06-22-2011, 11:38 AM Go to last post
  19. Problem of a biased coin

    Hi! I am having problems to solve the subsequent probability problem: A person has a biased coin. It was fabricated in a way that there is more...

    Started by zgz‎, 06-21-2011 08:27 AM
    • Replies: 1
    • Views: 3,413
    06-21-2011, 09:07 AM Go to last post
  20. Issues with Probability Mass Function

    Hello, could someone please provide guidance with this question? (a) Let X be the maximum value when two cards are randomly selected from a deck...

    Started by Breno Cavalheiro‎, 06-21-2011 01:03 AM
    • Replies: 3
    • Views: 4,512
    06-21-2011, 09:05 AM Go to last post
  21. Can't answer C & D

    Hi, Had a problem on the test where I answered A & B correctly but C & D I did not understand. A company finds that an average of 25% of all...

    Started by logika‎, 06-19-2011 03:33 PM
    • Replies: 1
    • Views: 2,182
    06-19-2011, 03:37 PM Go to last post
  22. Thumbs down Laplace transform

    Let X_1, X_2, ... be independent and identically distributed positive random variables with the Laplace transform L(t) = E(e^{-tx}) =...

    Started by madara123‎, 06-19-2011 08:49 AM
    • Replies: 2
    • Views: 3,637
    06-19-2011, 10:49 AM Go to last post
  23. convergence and expectation

    Let X_1, X_2, ... be independent and identically distributed random variables with the characteristic function \varphi_X(t) = E(e^{itx}) =...

    Started by madara123‎, 06-18-2011 09:17 PM
    • Replies: 3
    • Views: 4,197
    06-19-2011, 08:20 AM Go to last post
  24. Probability Question

    This is not for homework or class. Only research can make me post such a specific question. I've tried different things, and searched a lot online,...

    Started by monkeyD‎, 06-17-2011 10:41 AM
    • Replies: 8
    • Views: 3,585
    06-18-2011, 06:15 PM Go to last post
  25. Post simple probability questions

    Hi, I need some help with this question, it seems simple, but I am not sure I did it correctly... In some country, there are 3 newspapers. 30%...

    Started by Yankel‎, 06-18-2011 09:21 AM
    • Replies: 3
    • Views: 5,441
    06-18-2011, 03:04 PM Go to last post
  26. sigma algebra and expectation

    Are the following true or false ? Explain your answers. (If it is false, giving a counter example will do.) 1) If \displaystyle A_j \in ...

    Started by madara123‎, 06-18-2011 05:44 AM
    • Replies: 6
    • Views: 4,461
    06-18-2011, 02:25 PM Go to last post
  27. Convolutiosn and the Standard Gaussian distribution

    Hello, my question ; Suppose X1 and X2 are independent random variables, each with the standard gaussian distribution. Compute, using...

    Started by stukbv‎, 06-13-2011 12:50 PM
    • Replies: 1
    • Views: 2,050
    06-17-2011, 12:22 PM Go to last post
  28. help with setting up formula

    I am struggling with formula set up for the following practice problem study of caffeine consumption, smoking, etoh consumption and physical...

    Started by CEBARBOUR‎, 06-17-2011 11:14 AM
    • Replies: 1
    • Views: 1,980
    06-17-2011, 11:32 AM Go to last post
  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...

    Started by maple1988‎, 06-16-2011 10:48 PM
    • Replies: 0
    • Views: 1,725
    06-16-2011, 10:48 PM Go to last post
  30. density function for X^2Y^2 and max(X,Y)

    Hi guys i am struggling in how to find the density function for X^2Y^2 and max(X,Y). Here's the scenario: Suppose a random variable X has the...

    Started by kingkong‎, 06-15-2011 11:47 AM
    • Replies: 3
    • Views: 4,820
    06-16-2011, 03:05 AM Go to last post
  31. Need help on probability calculations

    Hi folks, I have to solve some problems with probability exercises and need helpt to understand how to find the right solution. Here it comes:...

    Started by bennemsi‎, 06-14-2011 03:16 AM
    • Replies: 1
    • Views: 1,587
    06-14-2011, 12:49 PM Go to last post
  32. Help with problem

    You are preparing to conduct a research study for a shopping mall owner. Research that you have reviewed indicates that people shop more during rain...

    Started by jamesculter‎, 06-11-2011 12:59 PM
    • Replies: 0
    • Views: 1,953
    06-11-2011, 12:59 PM Go to last post
  33. Calutate probability of failure count is greater then a value over a specified period

    Hi everyone, I wonderded wicht formula i can use tot caluclate the probability of a system with x components to fail (this occurs when he system has...

    Started by mrcannibal‎, 06-11-2011 03:26 AM
    • Replies: 1
    • Views: 2,336
    06-11-2011, 03:50 AM Go to last post
  34. Exclamation Tricky Poisson Formula Rearrangement

    Hello, I am currently doing some bus stop designs. I have not done statistics for a while but remember once doing poisson distributions at Uni. ...

    Started by PeterRose‎, 06-08-2011 01:13 AM
    poisson, probability, random
    • Replies: 5
    • Views: 3,822
    06-10-2011, 12:44 PM Go to last post
  35. Posterior Probability using Bayes Law with non-mutually exclusive events

    The problem: The prior probabilities for events A1 and A2 are P(A1)=.25, and P(A2)=.75. The conditional probabilities for event E given A1 and A2...

    Started by kened‎, 06-09-2011 11:25 AM
    • Replies: 2
    • Views: 4,828
    06-09-2011, 12:19 PM Go to last post
  36. 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...

    Started by Outlier‎, 06-08-2011 12:47 PM
    • Replies: 3
    • Views: 2,246
    06-08-2011, 04:43 PM Go to last post
  37. Exclamation Appropriate Hypothesis

    A company with a large fleet of cars hopes to keep gasoline costs down, and sets a goal of attaining a fleet average of at least 26 miles per gallon....

    Started by dmicevski‎, 06-01-2011 10:58 PM
    • Replies: 2
    • Views: 8,184
    06-07-2011, 10:26 PM Go to last post
  38. Expected Value calculation

    I have 2 random variables U and V uniformly distributed on . Their joint cumulative distribution function F(u, v) = min (u,v) on x . Therefore I...

    Started by 1stone‎, 03-30-2011 08:48 AM
    • Replies: 9
    • Views: 4,011
    06-07-2011, 04:17 PM Go to last post
  39. MTTF and repair

    Hi everyone, I have a little problem with an example exam question of mine! I hope anybody could help me. I have tried to find the answer for more...

    Started by mrcannibal‎, 06-07-2011 02:07 PM
    • Replies: 0
    • Views: 2,408
    06-07-2011, 02:07 PM Go to last post
  40. Weighted coin probability

    The problem: A coin is weighted to show heads 60% of the time. How many coin tosses are needed to have 90% confidence of getting more heads than...

    Started by bob3690‎, 06-06-2011 06:05 AM
    • Replies: 5
    • Views: 5,489
    06-06-2011, 03:18 PM Go to last post
  41. Suggested Book on Probability

    -------------------------------------------------------------------------------- I have never taken a course in probability. My teacher recommended...

    Started by chris ball‎, 05-25-2011 06:07 AM
    • Replies: 2
    • Views: 2,457
    06-06-2011, 03:16 AM Go to last post
  42. Selecting two counters without replacement

    Hi, This is a question from my textbook - unfortunately answers aren't supplied. Can someome please tell me if i'm right, or, where I went wrong? ...

    Started by tblake1987‎, 06-05-2011 04:54 AM
    • Replies: 3
    • Views: 2,013
    06-05-2011, 07:34 AM Go to last post
  43. Probability distributions that never have a density (not even a mass)

    Hi, the classical example of a distribution that has nowhere a density is Cantor's distribution. Now, I was wondering if we can build other...

    Started by advmc‎, 06-04-2011 08:33 AM
    • Replies: 0
    • Views: 1,707
    06-04-2011, 08:33 AM Go to last post
  44. Poisson Question

    I'm not a stat guy by any means, so I want to check my thinking here. Let's say a football player scored 11 Touchdowns in 16 games for an average...

    Started by cpaavola‎, 06-01-2011 03:16 PM
    • Replies: 7
    • Views: 2,672
    06-01-2011, 07:02 PM Go to last post
  45. Turning a Positive Number Into a Positive for Probability

    Lets assume that team A and team B will play a match, and their powers are calculated like this: A: 20 B: 10 From this; we conclude that A has...

    Started by Sabrosa‎, 05-27-2011 04:54 PM
    • Replies: 3
    • Views: 2,222
    05-31-2011, 10:56 AM Go to last post
  46. Point Estimate, Standard Error, Probability, etc.

    I'm taking an online Business Statistics class, which has turned out to be very difficult for me. I'm not good at math and the book/notes my teacher...

    Started by lauren_c28‎, 05-27-2011 05:45 PM
    • Replies: 0
    • Views: 3,157
    05-27-2011, 05:45 PM Go to last post
  47. Sampling from an inverse Chi Square-Distribution

    Hi all, I got some issues concerning the Chi-Square-Distribution. I am currently trying to implement MCMC-methods in order to determine the...

    Started by paul85‎, 05-26-2011 02:12 PM
    • Replies: 2
    • Views: 4,222
    05-26-2011, 05:25 PM Go to last post
  48. Question Calculating a posteriori probability for a three-urn problem

    Hi, I am a psychology experimenter and I am having some deep trouble with a bayiasian probabillity calculation. I hope someone may help me. Thank...

    Started by jpluedtke‎, 05-25-2011 03:28 AM
    • Replies: 3
    • Views: 2,759
    05-26-2011, 08:10 AM Go to last post
  49. Simple Significance Problem

    Hi, I am not a statistician so forgive my lack of knowledge. I am testing a percieved bias in foreign exchange data for significance to make sure...

    Started by joaquinmonfort‎, 05-26-2011 04:49 AM
    • Replies: 0
    • Views: 1,267
    05-26-2011, 04:49 AM Go to last post
  50. Normal distribution random variates and Chi square test

    Hi, I'm having problems "verifying" normal random variates using a Chi square test, in as much as I'm getting unexpectedly (to me at least) high...

    Started by MichaelWG‎, 05-24-2011 05:54 PM
    • Replies: 3
    • Views: 5,090
    05-25-2011, 03:04 PM Go to last post
  51. Facebook friend probability

    What is a probability to be friend with a random facebook user ? Is it correct to state that, because the average friend of a Facebook user is 135...

    Started by giudf‎, 05-23-2011 09:52 AM
    facebook, graphs, mutual friend
    • Replies: 2
    • Views: 3,463
    05-25-2011, 04:04 AM Go to last post
  52. Probability question concerning returning species

    Hi all, I hope you can help me. I have 1000 salmon logged at a river in 2009. I am trying to work out a probability percentage of those that will...

    Started by domcastro2‎, 05-24-2011 04:11 PM
    • Replies: 0
    • Views: 1,614
    05-24-2011, 04:11 PM Go to last post
  53. Need help with probabilities for work

    All, I am in desperate need of some help that isn't school related. I have some issues at work that need to be addressed and they deal with...

    Started by chadboehne‎, 05-24-2011 10:58 AM
    • Replies: 6
    • Views: 2,149
    05-24-2011, 03:40 PM Go to last post
  54. Probability problem cant get the second part.

    cant figure out part B of this problem, here is the problem : a machine used for filling bottles with a soft drink has a known standard deviation of...

    Started by EmmaHewitt‎, 05-23-2011 11:44 PM
    • Replies: 1
    • Views: 3,540
    05-24-2011, 04:09 AM Go to last post
  55. understanding the origin of the exponential distribution

    Hi all, I want to improve my understanding of the (mathematical) principles of my mostly applied prob/stats knowledge. What I was trying to do...

    Started by Junes‎, 05-17-2011 09:44 AM
    • Replies: 2
    • Views: 3,620
    05-22-2011, 10:31 AM Go to last post
  56. hi

    Let (X_n)_{n \geq 1} be a sequence of random variables such that E(X_n)>0 for all n. Is it straightforward for one to say that the series \sum_{n...

    Started by tzelios‎, 05-18-2011 08:26 AM
    • Replies: 5
    • Views: 2,541
    05-21-2011, 04:59 AM Go to last post
  57. "Six nines" reliability vs. safety factor

    Aircraft are supposed to have a 99.9999 % chance that they will work over some specified time interval. If a picture weighs 25# and you want the...

    Started by Outlier‎, 05-20-2011 10:41 AM
    • Replies: 3
    • Views: 4,443
    05-20-2011, 06:05 PM Go to last post
  58. Probably of success for 3 mutually exclusive events

    I have been removed from the details of this since college over 20 years ago... Here is my question... For event A, probability of success is 30%...

    Started by zinzah‎, 05-17-2011 10:52 AM
    • Replies: 5
    • Views: 3,540
    05-17-2011, 12:56 PM Go to last post
  59. Question Basic Probability question

    Hello everyone, new to statistics and new here! I'm working on a question and for the life of me cant seem to get my head round the initial steps,...

    Started by lazaah‎, 05-17-2011 07:41 AM
    • Replies: 1
    • Views: 1,459
    05-17-2011, 08:50 AM Go to last post
  60. Sums and products of random variables

    Hi all, Can anyone help me with the below question? for each of the following pairs of random variables X,Y, indicate a. whether X and Y are...

    Started by dizzle1518‎, 05-16-2011 07:33 PM
    • Replies: 1
    • Views: 2,199
    05-17-2011, 03:51 AM Go to last post

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