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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: 30,234
    09-30-2005, 09:44 AM Go to last post
  1. Sampling with replacement - probability problem

    Hi all, (this is my first post, hopefully I am not breaking any rules). I have the following problem that I cannot solve: I have a set of...

    Started by Bep75‎, 04-15-2016 01:06 PM
    • Replies: 6
    • Views: 2,081
    04-17-2016, 03:02 PM Go to last post
  2. Z-score from a negative x value

    Hello, I am trying to calculate the z-score for a normal random variable(x), which has a negative value. I know the formula. If x < 3.4 the mu...

    Started by BernardW‎, 11-19-2013 07:08 PM
    normal random variables
    • Replies: 1
    • Views: 2,546
    11-19-2013, 08:58 PM Go to last post
  3. Help with Binomial Proportion Estimate

    Hello All, This problem has been giving me headaches! When a person walks into a supermarket they either use a cart (success) or don't use a...

    Started by BernoulliX‎, 05-06-2010 02:37 AM
    • Replies: 2
    • Views: 2,859
    05-06-2010, 05:22 PM Go to last post
  4. Can somebody help me look this over to verify if it is correct?

    I have this project I am working on. I want to make sure it is correct. My professor helped me with part of it in the middle, and I had difficulty...

    Started by bershe‎, 12-05-2014 08:09 AM
    • Replies: 0
    • Views: 1,328
    12-05-2014, 08:09 AM Go to last post
  5. Sum of n random variables with normal distribution

    I am struggling with this problem: Independent random variables X_1, ... , X_n have normal distribution with mean 0 and variance 2. What is the...

    Started by bessi‎, 05-14-2014 11:05 AM
    distribution, normal distribution
    • Replies: 2
    • Views: 1,779
    05-14-2014, 03:13 PM Go to last post
  6. Geometrical distribution problem

    I am trying to solve this problem: X_1, X_2,..., X_100 are independent and have geometrical distribition with probability of success 1/2...

    Started by bessi‎, 05-14-2014 04:18 PM
    • Replies: 1
    • Views: 1,465
    05-15-2014, 09:28 AM Go to last post
  7. Minimum of 2 dependent Random Variables

    Guys, how can I find the distribution of the min between two random variables, if the two random variables are not independent?

    Started by bestfede‎, 05-17-2013 08:46 AM
    • Replies: 1
    • Views: 3,279
    05-17-2013, 12:31 PM Go to last post
  8. Need Help please!!

    I seem to be really stuck on the whole probability concept. I am trying to work through my assignment but it seems like I keep getting stuck. Can...

    Started by BestNurse‎, 11-25-2009 12:09 PM
    • Replies: 3
    • Views: 2,179
    11-25-2009, 10:47 PM Go to last post
  9. I have another question please!!

    I need help with how I figure out the solution to a question I am working on. I seem to be having a difficult time with probability and it does not...

    Started by BestNurse‎, 11-25-2009 09:32 PM
    • Replies: 1
    • Views: 2,014
    11-25-2009, 11:40 PM Go to last post
  10. Need help with a question please!

    Hey everyone. I am having difficulty with one of my questions and would appreciate any help. It deals with normal distribution. The mean price is $36...

    Started by BestNurse‎, 12-12-2009 10:57 AM
    • Replies: 2
    • Views: 2,168
    12-12-2009, 11:19 AM Go to last post
  11. I still need help please

    Ok, so I am still working on this freaking problem. Can someone help me please. It states that the scenario is normally distributed with a mean price...

    Started by BestNurse‎, 12-12-2009 08:42 PM
    • Replies: 12
    • Views: 22,987
    12-14-2009, 09:10 PM Go to last post
  12. Question Fitting joint distribution to empirical data

    I have a dataset of two correlated poisson variables X1 ~ Poisson(my1) X2 ~ Poisson(my2) Pr(X1,X2)<>Pr(X1)*Pr(X2) I would like to specify...

    Started by betso‎, 10-08-2008 10:02 AM
    • Replies: 0
    • Views: 4,317
    10-08-2008, 10:02 AM Go to last post
  13. Homework Question

    Okay, so I have this question for homework and I really don't know what its asking me...if anyone can put it in layman terms for me I'd be really...

    Started by betticat‎, 03-04-2008 12:08 PM
    • Replies: 1
    • Views: 3,696
    03-04-2008, 12:27 PM Go to last post
  14. Exclamation DeMorgans Law

    I NEED DESPRETE HELP! I'M GONNA FAIL MY CLASS IF I DON'T GET THE ANSWERS RIGHT! PLEASEEE! Heres the problem: A local TV station predicts a 80&#37;...

    Started by bettyboop1991‎, 11-13-2008 06:31 PM
    • Replies: 0
    • Views: 2,066
    11-13-2008, 06:31 PM Go to last post
  15. Probability - Expectation of multiple exponentials

    Hi everybody, Your forum has been helpfull for some problems that I had in the past (they were already asked here), but now I have a question that...

    Started by BEX‎, 08-14-2011 02:41 PM
    • Replies: 5
    • Views: 3,639
    08-16-2011, 03:22 PM Go to last post
  16. Basic (or maybe not so) probability problem/experiment/question.

    I came upon an interesting probabilistic assertion in a book I'm reading. Here's the quote: "Once in a while we find co-occurrences, and we're...

    Started by bfotk‎, 09-05-2011 05:23 PM
    probability question
    • Replies: 6
    • Views: 2,733
    09-06-2011, 03:20 AM Go to last post
  17. Please help. This is impossible. Please!

    Please help me answer these. They are due by midnight and I am totally lost. Please. I need to pass this class. Thanks in advance. You can see...

    Started by BGAndrea‎, 03-06-2010 08:41 AM
    • Replies: 3
    • Views: 3,396
    04-07-2010, 01:02 AM Go to last post
  18. 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...

    Started by bghiggeri‎, 07-08-2014 04:27 PM
    • Replies: 0
    • Views: 1,913
    07-08-2014, 04:27 PM Go to last post
  19. 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...

    Started by bgm1961‎, 08-06-2014 11:43 AM
    bag, drawing, outcomes
    • Replies: 3
    • Views: 2,616
    08-07-2014, 12:08 PM Go to last post
  20. Joint probability distribution table

    Helllo, I have this problem for an assignment: 1. It is known that box C has 3 blue balls, numbered from 1 to 3, and 2 red balls, numbered from 4...

    Started by bgrober‎, 10-18-2010 04:18 PM
    • Replies: 1
    • Views: 8,117
    10-18-2010, 05:16 PM Go to last post
  21. Profit maximization / Random Variable

    If a store owner defines total daily profit as total revenue from newspaper sales, less total cost of newspapers ordered, less goodwill loss from...

    Started by bholland‎, 02-17-2009 11:40 PM
    • Replies: 0
    • Views: 3,054
    02-17-2009, 11:40 PM Go to last post
  22. Hard probability question/game-binomial dist.

    Consider 50 people and series of 10 rooms. Each room has, for example, 5 doors that will open to the next room with known (totally known, including...

    Started by bhr23‎, 11-22-2014 09:58 AM
    binomial, game
    • Replies: 0
    • Views: 1,036
    11-22-2014, 09:58 AM Go to last post
  23. Regarding joint Probability distribution

    Ha All, I have three random variable X,Y and Z, which is related to each other by given relation: Z=X+Y. I want to calculate joint pdf of...

    Started by bhupy‎, 08-12-2013 05:05 AM
    • Replies: 1
    • Views: 1,667
    08-12-2013, 09:31 AM Go to last post
  24. Combining two sources of uncertainty

    I will use an imperfect dice for simplicity. Let's assume there are two factors that influence the probability of the results obtained from throwing...

    Started by BIal‎, 10-08-2017 09:24 AM
    distribution, probability
    • Replies: 2
    • Views: 189
    10-08-2017, 03:51 PM Go to last post
  25. Negative binomial distribution

    Hello, I am a student at the university of Hasselt (Belgium) in management, and I had to follow a statistical course. It is for me very difficult...

    Started by bibifers‎, 06-02-2014 12:44 PM
    • Replies: 7
    • Views: 2,118
    06-02-2014, 05:16 PM Go to last post
  26. 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...

    Started by bidou8601‎, 08-29-2014 08:39 AM
    • Replies: 3
    • Views: 3,450
    08-29-2014, 04:17 PM Go to last post
  27. Mean of a Joint Random Variable

    I am new to statistics, so bare with me please. I have the following question to answer. Suppose X and Y have joint density f(x, y) =...

    Started by Bidski‎, 08-23-2012 09:00 PM
    • Replies: 4
    • Views: 1,596
    08-23-2012, 10:12 PM Go to last post
  28. Probability Problem

    Hi all, I have been trying to come up with the correct answer for part c) of this question with no luck. A gumball dispenser has 38 orange...

    Started by biff44‎, 02-22-2008 01:42 PM
    • Replies: 4
    • Views: 5,644
    02-22-2008, 04:09 PM Go to last post
  29. Probability Noob

    Hey guys, Im a noob im taking Prob & Stats for Eng. Im only familiar with probability of getting a 4 by rolling a die. Anyway I just wanted to run...

    Started by bigbob‎, 09-21-2013 09:51 PM
    • Replies: 0
    • Views: 4,266
    09-21-2013, 09:51 PM Go to last post
  30. Help with cdf

    I'm having trouble with grasping cdf's. If I have a cumulative distribution function F(x) = .0 ----- x<-2 ...

    Started by bigbob‎, 10-06-2013 04:53 PM
    cdf, cdf technique
    • Replies: 5
    • Views: 1,707
    10-07-2013, 12:12 PM Go to last post
  31. Need Help

    If anyone can take a look at these two problems and see my answers and let me know if I did it correct or am doing it wrong it would be greatly...

    Started by bigbob‎, 09-29-2013 04:56 PM
    • Replies: 6
    • Views: 2,970
    09-29-2013, 07:27 PM Go to last post
  32. Some questions

    1. Suppose you are calculating an Analysis of Variance for a completely randomized design. You are testing the hypotheses: H0: 1 = 2 = 3 = H1:...

    Started by bigbob‎, 02-18-2014 01:21 PM
    • Replies: 0
    • Views: 1,192
    02-18-2014, 01:21 PM Go to last post
  33. Comparing the skewness of two smaple distributions

    Hi Everyone, I wonder if anyone can help me here. Suppose I have two samples with, say, 100 observations in each, and I am not sure if the...

    Started by BigBugBuzz‎, 11-26-2010 06:53 AM
    • Replies: 1
    • Views: 3,743
    01-04-2011, 10:05 AM Go to last post
  34. Balls in buckets ...

    Suppose there are T buckets in a room. Suppose further that there are two individuals, 1 and 2, who each have B1 and B2 tennis balls, where B1...

    Started by BigBugBuzz‎, 01-16-2013 05:32 AM
    combinatorics
    • Replies: 4
    • Views: 1,597
    01-16-2013, 09:14 AM Go to last post
  35. 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...

    Started by BigBugBuzz‎, 06-05-2013 05:56 PM
    combinations
    • Replies: 5
    • Views: 1,653
    06-06-2013, 05:54 AM Go to last post
  36. A question about sampling

    Consider two probability distributions, A and B. A has greater variance than B, but A and B have equal means. We are not told anything about their...

    Started by BigBugBuzzz‎, 11-11-2011 10:51 PM
    sampling, variance
    • Replies: 13
    • Views: 3,733
    04-27-2012, 09:52 AM Go to last post
  37. Product Normal Distribution

    Hi, Summing normal distributions is nice and easy, providing another normal distribution. But multiplying gives the Product Normal Distribution....

    Started by BigBugBuzzz‎, 01-20-2012 10:51 AM
    productnormaldist
    • Replies: 6
    • Views: 15,990
    01-20-2012, 12:54 PM Go to last post
  38. [SOLVED] Correlation between two normal variables ...

    Suppose A ~ N (0,a), B ~ N (0,b-a), C = A + B what is the expression for the correlation between A and C?

    Started by BigBugBuzzz‎, 02-03-2012 12:37 PM
    2 Pages
    1 2
    correlation, normal random variables
    • Replies: 17
    • Views: 6,885
    02-04-2012, 11:48 AM Go to last post
  39. A question about the distribution of random numbers

    Suppose I have two independent random variables A, and B, which are distributed Normally as follows: A: N~(MA,VA) B: N~(MB,VB) Now consider...

    Started by BigBugBuzzz‎, 09-18-2012 09:06 AM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 5,729
    09-20-2012, 08:35 AM Go to last post
  40. A question about the distribution of random numbers - PART II

    Thanks to BGM and Dragan, my problem posted under the thread " A question about the distribution of random numbers" now appears to be solved! The...

    Started by BigBugBuzzz‎, 09-20-2012 08:59 AM
    • Replies: 7
    • Views: 1,543
    09-20-2012, 05:12 PM Go to last post
  41. Normal Distribution times constant

    I can't seem to find anything about this on the web. If I have a random variable distributed Normally: x ~ Normal(mean,variance) is the...

    Started by BigBugBuzzz‎, 09-30-2012 09:45 AM
    normal distribution
    • Replies: 4
    • Views: 33,701
    02-18-2015, 09:45 PM Go to last post
  42. probability question help

    I need help with this question: A computer company receives large shipments of microprocessors. It must ensure that the proportion of them that are...

    Started by bighippo‎, 02-02-2006 02:23 PM
    • Replies: 1
    • Views: 2,605
    02-02-2006, 03:31 PM Go to last post
  43. Facebook Probability Question

    This seems like a straightforward problem, but I cant seem to wrap my head around it. Maybe tomorrow after a little more sleep! In short, Im...

    Started by bigjohn1947‎, 02-05-2010 04:54 PM
    • Replies: 0
    • Views: 2,195
    02-05-2010, 04:54 PM Go to last post
  44. bayesian statistics

    I have a large amount of data, given totals for every hour over a year period for the following columns: # of Jams Jam event time in minutes # of...

    Started by bigshottkyd‎, 12-01-2015 01:23 PM
    bayes, bayesian, probability, regression
    • Replies: 0
    • Views: 1,234
    12-01-2015, 01:23 PM Go to last post
  45. EX and var(X)

    I need some help with this conceptually. Find EX and var(X) for a random variable with pdf f(x)= 1/2e^(-|x|) Is this correct? {\it...

    Started by BiGsombrerO‎, 02-06-2012 10:27 PM
    • Replies: 4
    • Views: 3,364
    02-06-2012, 11:18 PM Go to last post
  46. Function of a RV

    X~N(mu,sigma^2) Find pdf of Y=aX^2+bX+c I know that if X is normally distributed then if Y=aX+b, Y~N(a*mu+b, a^2*sigma^2). Is there a similar...

    Started by BiGsombrerO‎, 03-03-2012 03:27 PM
    • Replies: 1
    • Views: 1,952
    03-03-2012, 04:05 PM Go to last post
  47. Expected Value Distribution

    Hi, I have a question pertaining to the problem: The expected value of the number of customers entering a shop during a 15 minute time interval...

    Started by Bikelyst‎, 05-15-2013 03:27 PM
    • Replies: 6
    • Views: 1,756
    05-15-2013, 04:13 PM Go to last post
  48. 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 cant remember the...

    Started by BillMisc‎, 10-13-2013 10:50 AM
    • Replies: 3
    • Views: 1,972
    10-13-2013, 01:36 PM Go to last post
  49. area under curve normal distribution

    Two issues, that I am confused about after reading statistics books. Example: weight of an adult is normally distributed with mean of 180 lbs...

    Started by billmt‎, 12-08-2012 01:38 PM
    conditional expectation, normal distribution
    • Replies: 3
    • Views: 1,926
    12-08-2012, 04:35 PM Go to last post
  50. Post Problem Understanding Simple Example

    I have a simple example that I do not understand. I would really appreciate some help. It's been 30 years since I had a class in probability :) ...

    Started by BillyBob‎, 02-13-2013 10:49 PM
    • Replies: 1
    • Views: 1,750
    02-14-2013, 05:38 AM Go to last post
  51. Multiple Regression?

    Hi I wonder if somebody can help me i've been hurting my head all day trying to figure out how to do this... The last time i did statistics was...

    Started by BillyC‎, 07-14-2009 11:59 AM
    • Replies: 2
    • Views: 3,475
    07-15-2009, 02:31 AM Go to last post
  52. Deriving Var from mu and two Ps

    If I know the mean of a normal distribution and two probabilities F1=P(Z>z1) and F2=P(Z>z2), I should be able to derive the Var of the distribution,...

    Started by billylyman‎, 03-13-2013 12:53 PM
    cdf, gaussian distribution, normal
    • Replies: 2
    • Views: 1,456
    03-13-2013, 02:03 PM Go to last post
  53. High Sig. Values in ANOVA and post-hoc?

    I have another question, which I'm looking for a statistical opinion on. On the ANOVA & Post-hoc analysis in SPSS: When we look for statistical...

    Started by Billyvic‎, 07-30-2006 12:34 PM
    • Replies: 0
    • Views: 2,488
    07-30-2006, 12:34 PM Go to last post
  54. Unhappy Probability Question - Express in terms of P

    Hi, I am currently stuck on a probabilities question and I was wondering if anyone could help me a bit. A and B are two events. Suppose that ...

    Started by Bill_McCoy‎, 02-16-2015 08:07 AM
    express in terms of p, independent, probabilities
    • Replies: 1
    • Views: 1,206
    02-17-2015, 04:51 PM Go to last post
  55. Post Binomial Distribution Question

    Hey guys, I have a bit of trouble understanding this binomial distribution question According to the call center statistics of a company, on...

    Started by Bill_McCoy‎, 03-05-2015 05:27 AM
    • Replies: 5
    • Views: 1,871
    03-05-2015, 10:43 AM Go to last post
  56. Post Distribution of Sample Mean Question

    Hi, I have a bit of a problem with constructing a sampling distribution of the mean. The question itself is relatively simple: A population...

    Started by Bill_McCoy‎, 03-07-2015 04:40 AM
    • Replies: 1
    • Views: 1,290
    03-07-2015, 06:23 AM Go to last post
  57. Question Strange Random Walk

    All, it's been a while since college and I need a bit of help with a (probably simple) question regarding random walks: I would like to prove...

    Started by bimmerforce‎, 01-22-2009 11:40 AM
    • Replies: 7
    • Views: 3,811
    01-22-2009, 02:56 PM Go to last post
  58. Throwing a die 7 times

    Hello, my problem is as follows: Throw a die 7 times. i) What is the probability that you get number 6 twice and all other numbers...

    Started by binjip‎, 07-09-2011 01:25 PM
    die, permutation
    • Replies: 4
    • Views: 2,626
    07-10-2011, 06:19 AM Go to last post
  59. Thumbs up Covariance of random balls

    Hi, would appreciate any comments: I have: 10 balls with number 6 on each, 10 balls with n. 7, 10 balls with n. 8. So it's 30 balls in...

    Started by binjip‎, 07-09-2011 01:39 PM
    covariance
    • Replies: 2
    • Views: 2,012
    07-09-2011, 06:17 PM Go to last post
  60. Question Hypothesis test of sample (yes/no) and proportions

    Edit: I'm not sure whether this belongs in statistics or probability forum. Hi guys, I' prepping for exams with old exam questions and I'm...

    Started by BioEngineer‎, 05-25-2016 06:06 PM
    • Replies: 0
    • Views: 1,462
    05-25-2016, 06:06 PM Go to last post

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