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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: 30,333
    09-30-2005, 09:44 AM Go to last post
  1. independent and disjoint

    If C and D be independent events which are disjoint. What can we said about their probabilities?? i know C, D are independent so P(C n D)=P(C)...

    Started by xixihaha‎, 11-28-2008 03:33 PM
    • Replies: 6
    • Views: 10,055
    11-29-2008, 02:10 PM Go to last post
  2. HELP! P with percentages...3 problems

    :) 1. A researcher wishes to conduct a study of the color preferences of new car buyers. Suppose that 40% of this populatin prefers the color red....

    Started by mathmoron‎, 12-14-2009 08:23 AM
    • Replies: 2
    • Views: 10,035
    12-26-2009, 10:45 PM Go to last post
  3. question please help!

    Let Y1, Y2,...,Yn be independent Poisson random variables with means λ1, λ2, ...,λn, respectively. find a. probability function of Σyi( i=1 to n) ...

    Started by probabilityhelp‎, 04-08-2011 12:19 AM
    • Replies: 4
    • Views: 10,030
    04-08-2011, 01:59 AM Go to last post
  4. 95% CI is Insignificant, P-Value is Significant

    Suppose you're performing a 2x2 contingency table analysis. You do your Chi Square or Fisher Exact test, as appropriate, then you calculate an odds...

    Started by StatNinja‎, 09-02-2010 01:54 PM
    • Replies: 2
    • Views: 10,018
    09-02-2010, 10:21 PM Go to last post
  5. Probability different colored balls picked without replacement "at least one of each"

    Hello everyone. I am a hobby programmer working on a cool new project. I've always loved probability and always wanted to write a program using it...

    Started by neogenesisrevo‎, 02-16-2012 10:07 AM
    • Replies: 7
    • Views: 10,004
    02-19-2012, 07:38 AM Go to last post
  6. Lightbulb What is the chance to have a mutual friend with a random person ?

    We have a social network say facebook. We know that it is composed by 500 milion of users. We know that each user have an average of 135 friend. ...

    Started by giudf‎, 03-14-2011 04:11 AM
    mutual friend, six degree, social network
    • Replies: 8
    • Views: 9,987
    09-02-2011, 06:35 PM Go to last post
  7. Exclamation I need help please!!!

    A mail order company receives an average of five orders per 500 solicitations. If it sends out 100 advertisements, find the probability of receiving...

    Started by carebear70417‎, 10-09-2005 08:33 PM
    • Replies: 4
    • Views: 9,981
    10-09-2005, 08:51 PM Go to last post
  8. Question Uniform Distribution/Probability Density Function

    I'm experiencing a mental block with this concept. If anyone could help me out, I'd be most appreciative. I understand the formula for the...

    Started by ambiguous325‎, 11-29-2005 02:00 PM
    • Replies: 3
    • Views: 9,934
    11-29-2005, 09:29 PM Go to last post
  9. Exponential Distribution

    I am in a 400 level Probabilities/Stats class at my university and am stuck on a problem relating to exponential distribution. I will list the...

    Started by jaknowlden‎, 10-24-2006 08:40 PM
    • Replies: 7
    • Views: 9,920
    10-26-2006, 07:53 PM Go to last post
  10. Exclamation Problem help please!

    I don't understand how to solve this problem. Please help! Thanks in advance A common design requirement is that an item (such as an aircraft or...

    Started by ineedmathhelp‎, 04-19-2009 07:30 PM
    • Replies: 3
    • Views: 9,909
    04-19-2009, 10:53 PM Go to last post
  11. Expectance and Variance of Mixed Distributions

    Hi, How do I get the expectance and variance of mixed variables. I can't seem to get a good exampe on this.

    Started by Naomikreinz‎, 11-10-2006 05:16 PM
    • Replies: 1
    • Views: 9,859
    11-11-2006, 02:11 AM Go to last post
  12. p-value

    Can anyone tell me what a p-value of .000 means in layman terms?

    Started by aeckland‎, 11-05-2007 04:18 PM
    • Replies: 1
    • Views: 9,818
    11-06-2007, 08:25 PM Go to last post
  13. Discrete and Random Variables

    I'm not sure how to setup this problem. It says: To perform certain type of blood analysis, lab technicians must perform two procedures. The...

    Started by elementarystat‎, 09-14-2009 08:06 AM
    • Replies: 1
    • Views: 9,755
    09-14-2009, 08:30 AM Go to last post
  14. Probability System, discrete dist.

    here is the system we're dealing with here Component 1 is the key one while an identical backup component is 2 and is in an "off" state until...

    Started by gator78‎, 11-08-2010 10:47 PM
    2 Pages
    1 2
    • Replies: 28
    • Views: 9,750
    11-16-2010, 12:10 AM Go to last post
  15. Sum of Weighted Probability Distributions

    If I sum independent random variables X + Y = Z, then the distribution f(z) will be given by the convolution of the probability distributions f(x)...

    Started by jensph‎, 05-13-2010 04:39 PM
    • Replies: 2
    • Views: 9,720
    05-14-2010, 10:38 AM Go to last post
  16. Almost sure convergence & convergence in probability

    "Almost sure convergence" always implies "convergence in probability", but the converse is NOT true. Thus, there exists a sequence of random...

    Started by kingwinner‎, 11-23-2009 08:37 PM
    • Replies: 6
    • Views: 9,682
    11-26-2009, 10:23 AM Go to last post
  17. Why can't t/(1-t) be a moment generating function for a R.V?

    Hi there, having a bit of trouble with this one: Explain/show why there can be no random variable for which Mx(t) (moment generating function) = t...

    Started by rpcas‎, 09-12-2011 06:49 AM
    • Replies: 11
    • Views: 9,670
    09-15-2011, 03:08 AM Go to last post
  18. Probability question

    Here is the problem: To get to work, a commuter must cross train tracks. The time the train arrives varies slightly from day to day , but the...

    Started by AlexKom‎, 12-13-2005 09:09 PM
    • Replies: 4
    • Views: 9,635
    12-15-2005, 11:13 AM Go to last post
  19. Random walk on a clock

    Consider the numbers 1, 2,..., 12 written around a ring as they usually are on a clock. Consider a Markov chain that at any point jumps with equal...

    Started by Ego7894612‎, 09-05-2010 12:13 PM
    • Replies: 5
    • Views: 9,635
    09-05-2010, 10:22 PM Go to last post
  20. Question How to calculate the number of samples?

    Our company receives wires which are manufactured to our spec in lot sizes that range between 2000 to 20000 wires at a time. These wires should be...

    Started by ffn884‎, 03-08-2010 11:24 AM
    • Replies: 4
    • Views: 9,629
    03-09-2010, 05:11 AM Go to last post
  21. Chi-Square distribution problem

    So my professor started doing stuff with the chi-square distribution this week and I've been lost for almost the entire time. Consider a random...

    Started by APOCooter‎, 02-18-2012 02:20 PM
    • Replies: 7
    • Views: 9,589
    02-18-2012, 05:50 PM Go to last post
  22. 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...

    Started by will22‎, 04-13-2013 02:46 PM
    • Replies: 4
    • Views: 9,546
    04-15-2013, 08:12 AM Go to last post
  23. Expected value and Standard deviation of 2 alternatives

    Hi! I'm glad I found this great forum! I really hope to be of use myself and help answer some easier questions. In the meantime, could somebody...

    Started by Jeremy87‎, 02-02-2010 05:02 PM
    • Replies: 1
    • Views: 9,529
    02-02-2010, 06:22 PM Go to last post
  24. Normal/Logistic Distribution: Sigma vs. S

    For Normal Distribution, we have the variables x, mean and sigma (standard deviation) For Logistic Distribution, we have the variables x, mean and...

    Started by StevenCraigMiller‎, 04-09-2011 10:20 PM
    • Replies: 1
    • Views: 9,506
    04-09-2011, 10:51 PM Go to last post
  25. Poisson or Binomial

    Hi, im trying to make sure i have the difference between when to use Binomial and Poisson distributions firmly understood. Regarding the following...

    Started by Hans Rudel‎, 05-01-2012 07:44 AM
    binomial distribution, poisson distribution
    • Replies: 5
    • Views: 9,495
    05-03-2012, 08:19 AM Go to last post
  26. Probability of 20-question test, binomial?

    20 true-false quiz to determine who has read a book. Shes wants to choose the passing grade such that the probability of passing a student who...

    Started by gator78‎, 10-12-2010 08:44 PM
    • Replies: 9
    • Views: 9,485
    10-14-2010, 12:28 AM Go to last post
  27. Marginal distribution over components of a normal-Wishart distribution

    Hey, I have a Gaussian-Wishart distribution (with hyperparameters {m, B, W, v}) over the mean and precision matrix of a bivariate Gaussian...

    Started by hythlodaeus‎, 02-22-2011 01:22 PM
    • Replies: 2
    • Views: 9,469
    05-11-2011, 01:35 PM Go to last post
  28. Smile The sign of COV( f(x,y) , g(x,y) )

    I am a PhD student in Economics, I am reading a paper on statistics, and the author states the following proposition without proof. My question is is...

    Started by Stole‎, 11-01-2008 02:00 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 9,356
    11-02-2008, 03:56 PM Go to last post
  29. The Gamblers Fallacy and Regression to the Mean

    Hi, so first time posting and all. I'm not a statistician by degree or trade (actually an engineer), so a little confused by something, and was...

    Started by Mr Ben‎, 11-16-2011 05:17 PM
    • Replies: 5
    • Views: 9,350
    10-10-2013, 02:27 PM Go to last post
  30. Probability of an Event

    There is probably a very simple answer to this, but please help a stats novice. I am trying to determine the probability of an event occurring in...

    Started by jwindebank‎, 02-02-2010 08:52 PM
    • Replies: 12
    • Views: 9,330
    02-03-2010, 09:00 PM Go to last post
  31. Uniform Probability

    I'm having trouble with this problem, and help would be really appreciated! Suppose a random variable x is best described by a uniform probability...

    Started by krgreider‎, 03-17-2010 09:55 PM
    • Replies: 2
    • Views: 9,314
    04-14-2010, 08:56 PM Go to last post
  32. The sample covariance matrix is ALWAYS nonsingular... Right?

    Just checking... I mean, with the exception of some peculiar cases (e.g. one variable is a linear combination of other ones present), there is no...

    Started by will22‎, 04-30-2013 11:04 PM
    • Replies: 8
    • Views: 9,252
    05-03-2013, 01:27 PM Go to last post
  33. 12-sided dice probability

    How would you give a sample space of rolling a pair of 12-sided dice?

    Started by myra619‎, 10-19-2007 10:02 PM
    • Replies: 2
    • Views: 9,233
    10-20-2007, 06:53 PM Go to last post
  34. Binomial Distribution as N goes to Infinity

    I know that the Central Limit Theorem says that all types of distributions go to normal distribution as N goes to infinity. However, is there some...

    Started by messianic‎, 07-15-2010 04:38 PM
    • Replies: 6
    • Views: 9,194
    07-15-2010, 07:36 PM Go to last post
  35. how to find joint probability distribution of 3 variables

    I am stuck in a problem. we have a red balls, b blue balls and c white balls. We are choosing n balls without replacement. How to find joint...

    Started by brunett1‎, 10-24-2006 11:31 PM
    • Replies: 2
    • Views: 9,186
    10-27-2006, 09:59 PM Go to last post
  36. Comparing Gaussian curves

    Hi, I have two points A(30.333,100) and B(30.333151665,80) I need to draw Gaussian for each point separately and need to check their overlap...

    Started by asd123‎, 03-04-2011 04:28 AM
    • Replies: 7
    • Views: 9,160
    08-31-2011, 05:35 PM Go to last post
  37. Scrabble probability question?

    I have a question for you probability and statistics experts out there. At the beginning of scrabble to determine who starts, each person (in this...

    Started by blahb‎, 10-04-2007 01:11 PM
    • Replies: 4
    • Views: 9,147
    12-21-2007, 04:22 PM Go to last post
  38. Geometric Distribution Qs. Please help.

    Hi everyone, My question is- If Y denotes a geometric random variable with probability of success p, then show that for a positive integer a,...

    Started by MonitorStats‎, 03-27-2009 11:49 PM
    • Replies: 2
    • Views: 9,107
    03-29-2009, 12:49 AM Go to last post
  39. 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...

    Started by Phil‎, 10-16-2007 11:19 AM
    • Replies: 1
    • Views: 9,106
    10-16-2007, 02:28 PM Go to last post
  40. Finding probability of left and right handed people

    Hello, I am lost on these problems: Assume that 13% of people are left-handed. If we select 10 people at random, answer the following questions: ...

    Started by dina786‎, 10-01-2012 06:14 PM
    • Replies: 11
    • Views: 9,058
    10-02-2012, 10:29 AM Go to last post
  41. finding p-value from chi square freedom

    For example, estimated p-value from chi-square table with 1 d.f is 0.1 < p < 0.9. Can anyone tell me how we get this range? aka. can anyone help me...

    Started by hanelliot‎, 02-22-2010 11:23 PM
    • Replies: 1
    • Views: 9,039
    02-23-2010, 02:42 AM Go to last post
  42. Independent Events Occurring Simultaniously

    This should be an easy one for you smart guys: Consider a double computer intruder detection system (IDS) with system A and system B. If there is...

    Started by KitsuMathTard‎, 10-08-2008 09:18 PM
    • Replies: 6
    • Views: 9,033
    10-10-2008, 07:48 AM Go to last post
  43. 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...

    Started by hedgie‎, 09-27-2012 02:17 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 9,031
    09-30-2012, 03:24 AM Go to last post
  44. Probability Simulation Software Recommendation

    I am looking for software recommendations that will allow me to define a known multi-level game for the purposes of running simulations to determine...

    Started by bpbenda‎, 08-14-2010 08:10 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 9,007
    08-19-2010, 10:59 AM Go to last post
  45. Dependent normal distributions

    I'm doing some stock market analysis for a personal project. If I have two stocks which generate returns which are normally distributed, what is...

    Started by jstonge‎, 10-07-2010 05:17 PM
    • Replies: 4
    • Views: 9,003
    10-08-2010, 01:33 PM Go to last post
  46. Probability of a Sample Mean between two numbers

    I am having troubles with a problem that requires me to find the probability of a sample mean between two numbers. I am given the mean and the SD,...

    Started by jtingle‎, 01-25-2010 09:46 PM
    • Replies: 0
    • Views: 8,993
    01-25-2010, 09:46 PM Go to last post
  47. wishart distribution and correlation matrix???

    hey there everyone! just a quick question.... you see how the sampling distribution of the covariance matrix follows a wishart distribution (for...

    Started by will22‎, 03-22-2011 02:10 PM
    • Replies: 7
    • Views: 8,980
    09-16-2013, 03:01 AM Go to last post
  48. Standardized Normal Distribution and Exponential Probability Distribution

    I am really stuck on these 2 questions, can some please help me!!!! First question is about Standardized Normal Distribution: P(-1.00<z<1.00) =...

    Started by IAMLOST‎, 01-23-2008 11:32 PM
    • Replies: 0
    • Views: 8,977
    01-23-2008, 11:32 PM Go to last post
  49. Question Finding the max and min P-value from an F-tets

    There is a following task in my econometrics HW: 1) I have 25 values of the {X} random value. First I find the variation, then the estimation for...

    Started by Artemy Piskarev‎, 09-28-2011 03:54 AM
    • Replies: 7
    • Views: 8,969
    09-30-2011, 07:28 AM Go to last post
  50. problem where the teach doesnt teach

    I am not 100% sure how to even start this. With the 2 variable I get lost Please any help Human visual inspection of solder joints on printed...

    Started by thomason50‎, 09-09-2008 06:33 PM
    • Replies: 2
    • Views: 8,928
    09-10-2008, 06:53 PM Go to last post
  51. Need help with a problem with Indicator Random Variable

    A building has 10 floors above the basement. 12 people get into an elevator at the basement, and each of the 12 chooses one of the 10 floors at...

    Started by StatStudent3‎, 10-05-2010 10:32 AM
    • Replies: 3
    • Views: 8,913
    10-05-2010, 07:24 PM Go to last post
  52. Help!! Probability ?????????????

    I have a problem and need some step to step computation and a bit of explanantion. Have deadine of tomorrow Here's the problem: Oil company...

    Started by Elizer‎, 10-19-2005 08:52 AM
    • Replies: 9
    • Views: 8,885
    10-20-2005, 10:24 AM Go to last post
  53. Expected Value of the Difference

    The heights of all male students in a university have mean 170 cm and standard deviation 10 cm. Two male students are randomly selected. What is...

    Started by Blooooooooo‎, 10-20-2010 01:21 PM
    • Replies: 3
    • Views: 8,874
    10-20-2010, 03:31 PM Go to last post
  54. Distribution of sample mean using MGF

    I'm not sure if I posted this in the right place, correct me if I'm wrong. I have been trying to solve this question for awhile now: Let...

    Started by ifomoe‎, 04-02-2011 05:26 AM
    • Replies: 4
    • Views: 8,858
    04-02-2011, 08:27 PM Go to last post
  55. Probability and Stat help

    I'm having trouble with my homework, can anyone figure out these problems for me? In a certain community, 35% of the families own a dog, and 20%...

    Started by mikeybao‎, 06-13-2008 08:58 PM
    • Replies: 2
    • Views: 8,824
    06-16-2008, 09:13 PM Go to last post
  56. Explain Terms...

    Am I correct? Q: A study compares two groups of mothers with young children who were on welfare two years ago. One group attended a voluntary...

    Started by mackerbuddy‎, 11-14-2005 04:37 AM
    • Replies: 1
    • Views: 8,799
    11-14-2005, 09:51 AM Go to last post
  57. Third Moment about the mean

    Let E=μ4 S=/σ^3, where E(X-μ)^3=E(X^3)-3+2^3 How can I rewrite the right hand side of the above expression in terms of μ, σ^2, S and μ4. ...

    Started by alias‎, 10-16-2011 06:06 AM
    • Replies: 11
    • Views: 8,758
    10-17-2011, 12:06 AM Go to last post
  58. variance for 2 random variables

    Studying for an intro course test and I have no one to compare it to right now.. any help would be appreciated. Here is the question. Q....

    Started by hanelliot‎, 02-15-2009 04:54 PM
    • Replies: 3
    • Views: 8,748
    02-16-2009, 09:52 PM Go to last post
  59. Question Calculating Joint Probability

    If I have uniform random variables X and Y in the range (a,b), how can I calculate joint probability distribution function p(y,x) for y...

    Started by smohantycs‎, 08-17-2010 10:18 PM
    • Replies: 4
    • Views: 8,732
    08-19-2010, 02:11 PM Go to last post
  60. chess probability question

    Hello, This question is taken from Ross' a first course in probability chapter 2. It is question 17. Here it is: If 8 rooks are randomly...

    Started by dmdmdm678‎, 05-04-2008 05:17 PM
    • Replies: 4
    • Views: 8,707
    05-06-2008, 12:28 PM Go to last post

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