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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: 30,170
    09-30-2005, 09:44 AM Go to last post
  1. Question i need help!

    this is my first year taking a stats class and i dont understand this question if someone could explain how to do it to me that would be greatly...

    Started by britishbrat13‎, 09-12-2007 05:12 PM
    • Replies: 1
    • Views: 2,372
    09-13-2007, 01:48 AM Go to last post
  2. i am having trouble with a stats question

    What do you think is the most common nonobstetric (not related to pregnancy) reason for hospitalization among 18-44 American women? According to the...

    Started by Britneymill55‎, 11-28-2010 10:09 PM
    • Replies: 1
    • Views: 2,736
    11-28-2010, 10:37 PM Go to last post
  3. need help with a few questions

    the question is: A shrub that is purchased at a local nursery has probability .80 of surviving the first year. If a customer pruchases 4 shrubs,...

    Started by Brittany Freilinger‎, 07-11-2007 12:26 PM
    • Replies: 1
    • Views: 4,770
    07-13-2007, 03:55 AM Go to last post
  4. Need help with contingency tables

    I'll do all the math in the contingency tables but I got this question and I'm stumped on how I should set the tables up, any advice would help a...

    Started by brody134‎, 10-16-2012 09:38 PM
    contingency tables, help please, probability
    • Replies: 0
    • Views: 1,277
    10-16-2012, 09:38 PM Go to last post
  5. Binomial formula - solve for N help ...

    Hi, I'm not a student and this is not for a test. I'm a programmer and this is related to the markets. This is a link for the common formula:...

    Started by brooksr‎, 03-07-2014 11:45 PM
    basic probability, binomial
    • Replies: 1
    • Views: 1,315
    03-08-2014, 01:42 AM Go to last post
  6. Can't justify 'correct' answer

    I thought I understood sampling without replacement fairly well, but this problem has me stumped as the answer that I calculate doesn't appear to be...

    Started by Brother Maynard‎, 07-27-2014 09:05 PM
    • Replies: 2
    • Views: 1,334
    07-29-2014, 07:29 PM Go to last post
  7. Normal Distribution Help :(

    Hi i had a problem with a normal distribution question The question is: Find a and b such that P(a<X<b)=0.90 and such that a and b are the same...

    Started by brownboy‎, 04-09-2008 02:26 PM
    • Replies: 1
    • Views: 1,927
    04-10-2008, 01:01 PM Go to last post
  8. Unhappy probability

    I am new to stats and have an assignment due in two days. I can only explain it by writing out the problem. Not sure how to begin solving. The...

    Started by browncl67‎, 11-25-2010 11:30 AM
    • Replies: 0
    • Views: 2,051
    11-25-2010, 11:30 AM Go to last post
  9. Help with basic proportions

    The Saloon claims that their pints, on average, are 16 ounces. To test whether the Saloon is actually pouring LESS than 16 ounces (at the .025...

    Started by brownclown‎, 10-11-2010 08:02 PM
    • Replies: 0
    • Views: 4,882
    10-11-2010, 08:02 PM Go to last post
  10. Probability of Yahtzee game

    Hi, i am new to this forum. Sorry if i post in wrong place. Have anyone played Yahtzee game? It's a popular game with 5 dice and you can roll up...

    Started by Bruce Kally‎, 11-03-2013 08:45 AM
    • Replies: 3
    • Views: 1,910
    11-03-2013, 09:59 PM Go to last post
  11. probability

    what is hypergeometric experiment?

    Started by brunett‎, 09-22-2006 11:10 PM
    • Replies: 4
    • Views: 2,484
    09-24-2006, 09:38 AM Go to last post
  12. prove inequality

    inequality theorem

    Started by brunett‎, 09-23-2006 05:48 PM
    • Replies: 0
    • Views: 3,628
    09-23-2006, 05:48 PM Go to last post
  13. weibull distribution

    How could weibull random variables be generated from a uniform random numbers generator?

    Started by brunett1‎, 10-24-2006 06:00 PM
    • Replies: 1
    • Views: 3,322
    11-05-2006, 08:40 PM Go to last post
  14. 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: 9,136
    10-27-2006, 09:59 PM Go to last post
  15. A coin thrown probability question

    Hi all I could not explain this question by using "the product rule for independent events" - A coin is thrown four times. What is the probility...

    Started by bryanevil‎, 12-27-2011 08:57 AM
    • Replies: 2
    • Views: 1,924
    12-27-2011, 11:03 AM Go to last post
  16. Set Complement

    In looking through my old text (Hogg and Craig ... ugh), I remember my professor gave a horrible answer to this question and no one in class really...

    Started by bryangoodrich‎, 02-26-2012 02:42 AM
    • Replies: 3
    • Views: 3,111
    02-26-2012, 05:56 PM Go to last post
  17. A probability question

    I am trying to revise for a test, and am working through some prep questions. I am struggling on this one, could anyone help? Suppose there is a...

    Started by bryce09‎, 08-22-2012 05:26 PM
    bayes, bayesian, probability
    • Replies: 4
    • Views: 1,201
    08-22-2012, 08:53 PM Go to last post
  18. Age and the Vancouver Stanley Cup Riot

    Practice Question: The information below is public knowledge just released by the BC justice department which shows some people who were charged...

    Started by bsd058‎, 12-02-2011 11:23 AM
    • Replies: 1
    • Views: 1,996
    12-02-2011, 11:57 AM Go to last post
  19. Estimate Probabilites

    Hi All, I am interested in replicating in-game win probabilities for the NBA. There are a number of sites on the web that do this; sometimes it...

    Started by Btibert3‎, 06-13-2010 04:45 PM
    • Replies: 2
    • Views: 2,597
    06-15-2010, 07:30 PM Go to last post
  20. Probability problem

    An experiment consists of flipping one coin four times. Give a pair of events that are independent and a pair of events that that are dependent, and...

    Started by BubblesMagee‎, 12-11-2014 03:12 AM
    • Replies: 0
    • Views: 1,248
    12-11-2014, 03:12 AM Go to last post
  21. joint probability

    is the product of a probability function in x and a probability density distribution in x a function describing joint probability as function of x?

    Started by buchenstein‎, 02-12-2013 05:54 PM
    • Replies: 2
    • Views: 1,305
    02-13-2013, 03:01 AM Go to last post
  22. Can you figure this out?

    My company has a Safety Bingo game. For every day there is no accident in the plant, we pull a number. Every associate has a card and there are 110...

    Started by buck‎, 08-23-2006 02:36 PM
    • Replies: 2
    • Views: 3,293
    08-30-2006, 09:25 AM Go to last post
  23. Probability that a hypothesis is correct

    I posted this question on Y! Answers a while ago and no one answered it :) I thought I'd try my luck here instead. A scientist performs an...

    Started by BucketOfFish‎, 05-03-2010 12:32 PM
    • Replies: 1
    • Views: 2,547
    05-03-2010, 03:15 PM Go to last post
  24. Conditioning on more than one event

    Lately, I've been studying conditional probability. I'm working with the following theorems: 1. P(A|B)=P(A,B)/P(B) (the comma represents...

    Started by Buckeye‎, 09-06-2016 06:23 AM
    • Replies: 4
    • Views: 1,875
    09-07-2016, 09:58 PM Go to last post
  25. a question with 3 different probablities

    a baseball problem player A has a batting average of .350, player B as a BA of .184 and player C has a BA of .381. Making no adjustments for the...

    Started by buddyreno‎, 08-20-2011 12:49 PM
    • Replies: 3
    • Views: 1,739
    08-20-2011, 04:21 PM Go to last post
  26. another baseball question

    Player will bat 4 times in this game. He is expected to get a single .15 of the time he goes to bat for 1 total base, he will get a double .05 a...

    Started by buddyreno‎, 08-22-2011 04:27 PM
    • Replies: 0
    • Views: 1,871
    08-22-2011, 04:27 PM Go to last post
  27. Video Game Probability Stats

    First off, hi! I've never been to this forum, but would like to humbly request help on something a little over my head. 1st problem at hand: ...

    Started by Bugg5287‎, 06-01-2008 01:55 AM
    • Replies: 0
    • Views: 4,244
    06-01-2008, 01:55 AM Go to last post
  28. Probability - help working out a betting probability scenario

    Need a little help and guidance: Tennis match. Player A to hold serve is 85%, Player B to hold serve is 80%. What is the probability that...

    Started by bumbblebee‎, 09-26-2016 09:33 AM
    • Replies: 0
    • Views: 1,295
    09-26-2016, 09:33 AM Go to last post
  29. hi a problem of probability.

    There are 3 bag. there are 5 white and 5 black balls in 1st bag. In the 2nd 4 white and 8 black. in the 3rd8 white n 6 black. A ball is selected...

    Started by bundho‎, 12-22-2005 04:44 AM
    • Replies: 1
    • Views: 2,323
    12-22-2005, 09:35 AM Go to last post
  30. Conditional expectation question

    Hey, I would really appreciate your help with the following question: X and Y each has a uniform distribution on and the two are independent....

    Started by busstud123‎, 03-01-2010 12:10 PM
    • Replies: 8
    • Views: 5,391
    03-06-2010, 02:46 AM Go to last post
  31. NCA Office Pool Win Probability

    Hello, I run a small NCAA office pool website where folks make predictions about the outcome of each game in a 64-team tournament that consists of...

    Started by BustedBracket‎, 12-19-2016 02:12 AM
    code, ncaa, probability, tournament
    • Replies: 0
    • Views: 3,007
    12-19-2016, 02:12 AM Go to last post
  32. Assistance with Monte Carlo Method for Board GAme

    Outcomes 16 cards. The cards have up to four values. I need assistance building a data set I can analyze. Simulating a starting hand, and...

    Started by Butlertom‎, 01-25-2016 08:18 PM
    • Replies: 5
    • Views: 1,861
    01-27-2016, 06:58 PM Go to last post
  33. Monte Carlo Assistance

    Hello, I have a monte carlo simulation built. Need assistance tweaking. Please reach out if interested. Tom

    Started by Butlertom‎, 02-01-2016 11:00 PM
    • Replies: 0
    • Views: 1,366
    02-01-2016, 11:00 PM Go to last post
  34. Backpropagated Probabilities

    To All: First, I am not sure if backproagation is the right way to define what I am looking at, but it appears to at least take the smallest...

    Started by bvw1987‎, 11-03-2014 09:38 PM
    • Replies: 2
    • Views: 1,117
    11-03-2014, 10:29 PM Go to last post
  35. Combining Bernoulli distributions

    I'm looking for a way to find the standard deviation of a certain distribution. This distribution is created by performing n_0 Bernoulli trials with...

    Started by b_d‎, 07-18-2012 01:55 PM
    bernoulli, binomial, combining, distribution, probability
    • Replies: 4
    • Views: 1,666
    07-18-2012, 03:20 PM Go to last post
  36. Probability that one random variable is greater than another

    I need to find the probability that a normally-distributed random variable is greater than a uniformly-distributed random variable. That is: X...

    Started by b_d‎, 07-19-2012 11:03 AM
    greater, normal, probability, uniform
    • Replies: 2
    • Views: 4,032
    07-20-2012, 12:52 PM Go to last post
  37. Infinite sum

    Hi All- It has been a few years since my last calc class and now I am taking a course in mathematical stats. I have the discrete data pmf:...

    Started by B_Miner‎, 10-11-2008 08:17 PM
    • Replies: 4
    • Views: 3,079
    10-12-2008, 02:06 PM Go to last post
  38. Discrete random variable

    Here is a problem given : Let X equal the number of flips of a fair coin that are required to observe heads-tails on consecutive flips. Need to...

    Started by B_Miner‎, 10-17-2008 07:25 AM
    • Replies: 1
    • Views: 4,076
    10-23-2008, 10:27 AM Go to last post
  39. Exponential pdf

    Hello all- Can anyone help on the meaning of the exponential distribution? The derivation I am looking at shows the cdf F(w) = P(W<=w) = 1 -...

    Started by B_Miner‎, 10-28-2008 07:39 PM
    • Replies: 1
    • Views: 3,173
    10-28-2008, 11:29 PM Go to last post
  40. Squared Normal Dist

    Hello All- My problem is: Find the distribution of W=X^2 when X is N(0,4) I know that this problem is related to the fact that Z^2 =...

    Started by B_Miner‎, 11-07-2008 09:30 PM
    • Replies: 2
    • Views: 3,227
    11-13-2008, 07:40 PM Go to last post
  41. E[MSE] simple linear regression

    Hi All- I am trying to figure out how to prove that MSE = SSE/n-2 is an unbiased estimator of sigma^2 in simple linear regression. I have that...

    Started by B_Miner‎, 10-01-2009 07:42 PM
    sigma^2, unbiased estimator
    • Replies: 14
    • Views: 41,473
    02-02-2013, 03:44 AM Go to last post
  42. Power large Sample Standardized?

    This is probably staring me in the face, but my face has been staring at it for many hours ... ;) In basic power analysis of a mean, using the...

    Started by B_Miner‎, 03-03-2010 08:50 PM
    • Replies: 1
    • Views: 2,209
    03-03-2010, 10:11 PM Go to last post
  43. EM Algorithm Clustering Nominals

    I am trying to derive the EM algorithm (applied to clustering) for the case where there is a numeric variable assumed to be Gaussian distributed (x1)...

    Started by B_Miner‎, 08-07-2010 08:49 PM
    • Replies: 0
    • Views: 2,130
    08-07-2010, 08:49 PM Go to last post
  44. Expected number of events in a simple birth-death process.

    I have a simple birth-death process with parameters, beta=4/5v and the initial population size is 6. I have calculated that the birth rate= 4/9 and...

    Started by C.Watt‎, 02-11-2016 05:38 AM
    gambler's ruin, probability, random walk
    • Replies: 0
    • Views: 2,235
    02-11-2016, 05:38 AM Go to last post
  45. Simple probablility question

    A closet contains 8 pairs of shoes. If 4 shoes are randomly selected, what is the probability that there will be no complete pair? So i know that...

    Started by c2q‎, 06-08-2010 12:51 AM
    • Replies: 8
    • Views: 7,997
    06-08-2010, 05:53 PM Go to last post
  46. Counting rules.

    Hi, Can someone please explain to me why the answer to this question is as written? Suppose we deal four 13-card bridge hands from an ordinary...

    Started by c2q‎, 09-24-2010 03:50 PM
    • Replies: 9
    • Views: 6,770
    09-26-2010, 08:20 PM Go to last post
  47. Need some help understanding probability theory.

    Hello, My probability course has just started and I have a little trouble in preparation for my first quiz tomorrow, understanding some concepts....

    Started by c2q‎, 09-19-2010 04:41 PM
    • Replies: 5
    • Views: 4,906
    09-19-2010, 10:02 PM Go to last post
  48. Simple probability question.

    Hi, this is a fairly simple problem that is confusing me a bit on some matters. A person watches tv at 6pm 2/3 of the time, and watches tv at 11pm...

    Started by c2q‎, 09-20-2010 08:32 PM
    • Replies: 1
    • Views: 3,178
    09-20-2010, 11:55 PM Go to last post
  49. Is P(A n B) the same as P(B n A)?

    As the topic says. If we have two events A and B respectively, is it possible that P(A n B) != P(B n A)? This isn't a homework question but its...

    Started by c2q‎, 10-05-2010 03:24 PM
    • Replies: 1
    • Views: 12,353
    10-05-2010, 03:44 PM Go to last post
  50. Cumulative distribution help.

    Okay so I've got this question: Let X be a random variable with a cumulative distribution function Fx. Prove that P(x=a) = 0 if and only if Fx is...

    Started by c2q‎, 10-10-2010 08:10 PM
    • Replies: 11
    • Views: 5,969
    10-11-2010, 06:25 PM Go to last post
  51. What does this mean?

    If a question asks us to find (X,Y) or show that (X,Y) ~ something X = something Y = something does that mean it is asking us to find/show the...

    Started by c2q‎, 11-07-2010 07:19 PM
    • Replies: 1
    • Views: 2,242
    11-07-2010, 10:35 PM Go to last post
  52. Urgent - how do i find joint density?

    If i have 2 individual probability distributions given for 2 different variables. So i have 2 variables x1 and x2. the distribution of x1 is the...

    Started by c2q‎, 11-11-2010 12:56 AM
    • Replies: 1
    • Views: 3,688
    11-11-2010, 03:35 AM Go to last post
  53. What does this distribution mean?

    When it says: the marginal distribution of Y is given by 1/Y ~ Exponential(lamda) does that mean the distribution is written has: ...

    Started by c2q‎, 11-26-2010 06:55 PM
    • Replies: 4
    • Views: 3,136
    11-28-2010, 05:52 PM Go to last post
  54. Expected Value question.

    Suppose that X, given Y = y, is distributed Gamma(α, y) and that the marginal distribution of Y is given by 1/Y~ Exponential(λ). Determine E(X). ...

    Started by c2q‎, 12-01-2010 10:15 PM
    • Replies: 2
    • Views: 3,403
    12-02-2010, 11:13 AM Go to last post
  55. Help with understanding this expected value proof

    can someone please explain this. My instructor did this but I don't really understand how. I have E(Y*E(YlX)) from theorem of total...

    Started by c2q‎, 09-25-2011 10:07 PM
    • Replies: 3
    • Views: 3,383
    09-26-2011, 04:06 AM Go to last post
  56. how to evaluate this expected value?

    hi I've been stuck on trying to understand a part of this proof I am reading. I want to know how they got from this step to the next = ...

    Started by c2q‎, 09-30-2011 05:06 PM
    • Replies: 0
    • Views: 2,299
    09-30-2011, 05:06 PM Go to last post
  57. Help with a proof

    If x1...xk are random variables defined on a set omega, and B1...Bk C R^1, then prove that (x1,....,xk)^-1 (B1x,...,xBk) = x1^-1B1 n x2^-1B2 n ......

    Started by c2q‎, 01-31-2012 05:04 PM
    • Replies: 2
    • Views: 2,306
    02-04-2012, 03:41 PM Go to last post
  58. Proving some axioms about sigma algebra.

    I have the following to prove: Given a sigma field/sigma algebra B on a set S. Prove: i) 0 E B ii) if B1,..,Bk E B then UBi E B for i = 1 to n...

    Started by c2q‎, 02-04-2012 01:13 PM
    • Replies: 9
    • Views: 7,575
    02-05-2012, 10:32 PM Go to last post
  59. Proof of covariance of a weak stationary stoch. process.

    Hey there. I'm having trouble on how to show this is true. Assuming you have a weakly stationary independent increments stochastic process with ...

    Started by c2q‎, 02-05-2012 02:43 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,745
    02-05-2012, 04:22 PM Go to last post
  60. Gaussian process proof.

    I want to prove that the brownian bridge is a gaussian process. Before I start I just wanted to make sure of something. In my notes my...

    Started by c2q‎, 02-05-2012 04:29 PM
    • Replies: 0
    • Views: 2,929
    02-05-2012, 04:29 PM Go to last post

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