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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: 30,213
    09-30-2005, 09:44 AM Go to last post
  1. Name for the expression E(Y|X)*Prob(X)

    I am working with a term which is an expectation conditional on an event, multiplied by the probability of the event occuring. For example,...

    Started by Leo Simon‎, 09-07-2012 07:05 PM
    conditional expectation
    • Replies: 5
    • Views: 2,211
    09-12-2012, 07:56 PM Go to last post
  2. Question Involving Both a Die and Coin

    Hi, I am having difficulties with this probability question and would love some feedback to see if I am thinking this through correctly: A die...

    Started by S-C-3-1-3‎, 09-09-2012 12:24 AM
    • Replies: 11
    • Views: 2,609
    09-12-2012, 08:41 AM Go to last post
  3. Question about a monte carlo simulation of car travel patterns

    Hi there, I have a question about probability, conditional expectations, copula functions and their use in a Monte carlo simulation. I'd...

    Started by bradyj2‎, 09-12-2012 08:13 AM
    • Replies: 0
    • Views: 1,217
    09-12-2012, 08:13 AM Go to last post
  4. Selection probability + time variable?

    Greetings statisticians, I seek advice regarding a probability of selection. Here is the scenario: I, living in the US, have a music collection...

    Started by tgrillo‎, 09-11-2012 08:29 PM
    probability estimate, selection bias, time dependence
    • Replies: 0
    • Views: 1,650
    09-11-2012, 08:29 PM Go to last post
  5. Curious read Chi-sq table

    for the rejection of hypothesis (2-tailed) with p=0,05 which chi-square table is correct, in example d.f.=4 and alpha=0,05. is it 0,484 (left) and...

    Started by sg2kilo‎, 09-10-2012 11:04 AM
    • Replies: 7
    • Views: 3,531
    09-10-2012, 09:47 PM Go to last post
  6. Stuck on Algebraic Proof

    Hi, I am trying to algebraically prove the following statement: (n-k+1) ((n) c (k-1)) = k ((n) c (k)). The following are the steps I have down on...

    Started by S-C-3-1-3‎, 09-10-2012 04:46 PM
    • Replies: 11
    • Views: 2,685
    09-10-2012, 07:00 PM Go to last post
  7. "either but not both" ??

    Hi, I was trying to complete this question, but I'm confused about where either but not both comes in: "certain chickens on a large farm have...

    Started by rlm‎, 09-10-2012 03:32 PM
    • Replies: 2
    • Views: 4,011
    09-10-2012, 04:43 PM Go to last post
  8. Uncorrelatedness implies independent ?

    Hi, my question is how to derive the following statement: Give two random variables, X and Y, if E(h(X)g(Y)) = E(h(X))E(g(Y)) for all...

    Started by egpivo‎, 09-09-2012 02:08 AM
    • Replies: 1
    • Views: 946
    09-09-2012, 03:28 AM Go to last post
  9. finding pmf and cdf of a random variable sequence

    Question: Consider the i.i.d. sequence X1, X2, X6 where each Xi is one of the four symbols (a,t,g,c). Further suppose that P(X1=a)=0.1,...

    Started by lbragrl79‎, 09-08-2012 08:56 PM
    • Replies: 1
    • Views: 2,865
    09-08-2012, 09:12 PM Go to last post
  10. conditional probability and size of population question.

    deleted post. no responses.

    Started by rummage‎, 09-07-2012 10:01 PM
    • Replies: 1
    • Views: 1,389
    09-08-2012, 05:47 PM Go to last post
  11. Oreos

    This should be simple but my 4 other people got a different answer than me. You have a bag with 6 oreos. 4 are vanilla, and 2 are chocolate. You...

    Started by dylanthewidge‎, 09-05-2012 03:38 PM
    • Replies: 3
    • Views: 1,479
    09-06-2012, 03:49 AM Go to last post
  12. Sampling Probability Question

    Hi Folks. i have a probability question. Actually, it's more of a sampling question. I have a population that contains 6 different conditions. ...

    Started by John Sigma‎, 09-03-2012 09:21 AM
    • Replies: 8
    • Views: 1,700
    09-05-2012, 06:05 AM Go to last post
  13. question on two uniform variables.

    Let X~Uniform(0,10), Y~Uniform(0,10). If E = 2, what is E[|X-5|?

    Started by newtoncam‎, 09-04-2012 02:02 PM
    • Replies: 2
    • Views: 1,800
    09-04-2012, 04:44 PM Go to last post
  14. Help Needed In Solving For Mean of Normal of CDF

    (My stats are a bit rusty so please forgive my clumsy notation and terminology.) Okay so given values for A,B and a probability p: p*F(A;mu,1)...

    Started by jacobcdf‎, 09-04-2012 11:46 AM
    • Replies: 5
    • Views: 1,929
    09-04-2012, 01:01 PM Go to last post
  15. Battleships Game

    Guys, I am struggling to understand how the probability of the Battleships game works. Clearly the variables are a) the area of the grid b) the area...

    Started by Mark Lee‎, 09-02-2012 04:12 AM
    • Replies: 1
    • Views: 1,181
    09-02-2012, 10:14 AM Go to last post
  16. Kelly formula for two options (one with 0 risk)

    Kelly says you should invest x% of your bankroll in a gamble (either lose everything or gain a multiple E from a win with probability p): x =...

    Started by Wuschelbeutel‎, 08-30-2012 08:53 PM
    • Replies: 1
    • Views: 1,525
    08-31-2012, 02:36 AM Go to last post
  17. Confidence Question?

    I have a question related, I think, to "confidence". The problem I have is when people jump to conclusions based on what appears to be a...

    Started by Hopkins‎, 08-30-2012 04:51 AM
    • Replies: 4
    • Views: 1,563
    08-30-2012, 09:12 AM Go to last post
  18. Post Area under PDF for Normal, beta, gamma, and weibull distribution

    Dear Stata user/Professional! I have a problem of integral function estimation for the Normal, Beta, Gamma, and Weibull density function in stata. ...

    Started by Mahadeb‎, 08-30-2012 12:24 AM
    • Replies: 0
    • Views: 3,721
    08-30-2012, 12:24 AM Go to last post
  19. classification of probability distributions

    Hi, I wonder if there is a classification of probability distributions or so called 'controlled vocabulary' or 'ontology'? So far I could find...

    Started by fuzzyswat‎, 08-29-2012 11:48 AM
    classification, distribution, ontology, probability
    • Replies: 0
    • Views: 2,276
    08-29-2012, 11:48 AM Go to last post
  20. Decomposition of bivariate normal density

    Hello, I have a question regarding the bivariate normal density. I need to evaluate density p(x,y), where x is a n x 1 vector and y is n*3 x 1...

    Started by Marek‎, 08-28-2012 10:33 AM
    • Replies: 2
    • Views: 1,199
    08-28-2012, 12:28 PM Go to last post
  21. 725 Facebook Friends, 6 Birthdays

    I logged into Facebook today to find that 6 of my 725 friends had their birthday today. This number seemed quite high to me. What are the odds of...

    Started by KLaw Squared‎, 08-27-2012 03:29 PM
    • Replies: 1
    • Views: 1,259
    08-27-2012, 03:46 PM Go to last post
  22. random walk without replacement probabalistic bounds

    Hi, I am trying to prove a seemingly simple property of random walks created by selecting steps without replacement. I'm considering...

    Started by petertw‎, 03-09-2009 10:55 PM
    • Replies: 2
    • Views: 3,123
    08-27-2012, 07:56 AM Go to last post
  23. gambling/trading problem

    Hi folks, I have a probability calculation problem that is currently doing my head in and I wonder if someone can tell me where I've gone wrong...

    Started by ratbag2‎, 08-26-2012 07:03 PM
    • Replies: 6
    • Views: 1,671
    08-27-2012, 03:42 AM Go to last post
  24. Probability - stuck trying to use a different solution

    The Conundrum Question? Two of the cylinders in an eight cylinder car are defective and need to be replaced. If two cylinders are selected at...

    Started by Jules73‎, 08-27-2012 12:18 AM
    • Replies: 0
    • Views: 3,024
    08-27-2012, 12:18 AM Go to last post
  25. Help!!!

    I HAVE THE ANSWER, I just need to know how I got there. (If that makes any sense) At a random moment between 6:30 and 7:30 a.m. the morning paper...

    Started by Ksmith123‎, 08-26-2012 07:11 PM
    • Replies: 1
    • Views: 949
    08-26-2012, 07:13 PM Go to last post
  26. Probability Help

    Two points are placed at random on (not in) a circle of diameter 1. The second point travels on the circle to the first point. Find the expected...

    Started by Ksmith123‎, 08-26-2012 05:01 PM
    • Replies: 3
    • Views: 1,847
    08-26-2012, 06:28 PM Go to last post
  27. Unhappy Probability

    Hi everyone, how can i start this? i have a lot of 32k parts and I would like to calculate the probability of finding one bad part in this lot, how...

    Started by albaosorio‎, 08-25-2012 11:42 AM
    • Replies: 2
    • Views: 1,627
    08-25-2012, 04:36 PM Go to last post
  28. EM Algo Iterations

    Dear all, Consider the EM algorithm. Does this algo has the property that the value of the objective function always decrease in an iteration...

    Started by Jacov‎, 08-25-2012 12:18 PM
    • Replies: 0
    • Views: 1,208
    08-25-2012, 12:18 PM Go to last post
  29. Binomial Probability

    problem solved :)

    Started by OneT‎, 08-24-2012 11:39 PM
    • Replies: 0
    • Views: 1,396
    08-24-2012, 11:39 PM Go to last post
  30. Game Theory Exercise! Help???

    Consider the following guessing game. There are 100 participants, and each participant announces independently and simultaneously a number between 0...

    Started by 123456789‎, 08-19-2012 03:25 AM
    • Replies: 3
    • Views: 3,511
    08-24-2012, 04:50 PM Go to last post
  31. ln probability

    this question im lost and confused to whats it asking X is a positive continuous random variable with mean 20 and standard deviation 2. In the...

    Started by lr22‎, 08-24-2012 04:04 AM
    • Replies: 1
    • Views: 1,840
    08-24-2012, 08:46 AM Go to last post
  32. Probability Involving a Variation on Poker

    Hey everyone, I've been experimenting with probability lately, and I've been creating various games for fun and analyzing the math behind them. On...

    Started by SDRS‎, 08-21-2012 05:57 PM
    combinations, poker, probability
    • Replies: 10
    • Views: 1,938
    08-24-2012, 12:49 AM Go to last post
  33. 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: 1,592
    08-23-2012, 10:12 PM Go to last post
  34. bootstrap theory reference?

    I am curious about bootstrap methods, and just read the very elementary explanation of them here:...

    Started by Eugenie‎, 08-19-2012 05:24 AM
    • Replies: 2
    • Views: 1,566
    08-23-2012, 08:02 PM Go to last post
  35. 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: 1,202
    08-22-2012, 08:53 PM Go to last post
  36. Var(X + XY + Y|X)

    Hey everyone, The exercise is as follows: Let X ~ N(0,2) and Y ~ N(0,1) be two random variables with cov(X,Y) = 0.5. Let Z=X+X*Y+Y. I have to...

    Started by Slavutich‎, 08-22-2012 01:09 PM
    • Replies: 0
    • Views: 1,678
    08-22-2012, 01:09 PM Go to last post
  37. Probability of breakdown

    I am considering using regression analysis to estimate the probability of breakdown of vehicles in a fleet. I have some evidence showing that...

    Started by katlin‎, 08-22-2012 08:08 AM
    • Replies: 0
    • Views: 2,138
    08-22-2012, 08:08 AM Go to last post
  38. Uniform Probability distribution question.

    So the question is this: http://i.imgur.com/WRMCC.jpg So far, I have: http://imgur.com/ddUPj How do I do part (b)??

    Started by taimoor2‎, 08-21-2012 02:40 PM
    • Replies: 1
    • Views: 1,538
    08-21-2012, 03:36 PM Go to last post
  39. 818 Facebook Friends, 0 Birthdays

    Hi all, first time poster here. I am an avid facebooker and like to wish people happy birthdays when they come up. Today, for the first time, I...

    Started by kmac1112‎, 08-21-2012 12:47 PM
    • Replies: 6
    • Views: 2,021
    08-21-2012, 02:09 PM Go to last post
  40. How many different combinations can a user make?

    I would like to figure how many different ways a report can be filtered. The report shows how many different units were sold. Filter 1: Allows...

    Started by Marshall‎, 08-18-2012 01:16 PM
    permutation combination
    • Replies: 8
    • Views: 4,019
    08-20-2012, 08:55 PM Go to last post
  41. How to find the conditional density

    Hi, I'm trying to solve the following exercise: Y = X Find f(X|Y) in terms of f_X(x) I have been able to find the pdf of Y, f_Y, via the...

    Started by IanS‎, 08-20-2012 05:26 PM
    • Replies: 0
    • Views: 1,324
    08-20-2012, 05:26 PM Go to last post
  42. Determine if a worker differs from typical performance?

    I'll start with some details about my specific situation. I've got a database that contains records of jobs, clients, and workers. My goal is to see...

    Started by jeremy_y‎, 08-17-2012 04:30 PM
    confidence, hypothesis testing, probability, statistical significance
    • Replies: 3
    • Views: 1,636
    08-18-2012, 02:03 PM Go to last post
  43. lottery tickets, better to buy all for one game or play X number of games

    Im wondering which would be better. Im assuming the following, chance of winning = 10,000 for a particular ticket. So if i bought 10 tickets, the...

    Started by Hans Rudel‎, 08-18-2012 12:47 PM
    probability, tree diagram
    • Replies: 0
    • Views: 844
    08-18-2012, 12:47 PM Go to last post
  44. Geometric Distribution question

    probability of raining each day = p = 0.01 q = 0.99 What is the expected number of days until we see a rainy day? I think the answer is ...

    Started by shrek‎, 07-17-2008 02:23 PM
    • Replies: 3
    • Views: 4,331
    08-17-2012, 05:31 AM Go to last post
  45. Tough Problem

    Well, for me anyway. :p A process undergoing tests has both electrical and mechanical parts. The tests show satisfactory operation 55% of the...

    Started by Jacobite‎, 08-17-2012 02:14 AM
    • Replies: 0
    • Views: 1,071
    08-17-2012, 02:14 AM Go to last post
  46. Card Drawing Help!

    This is for a project I'm working on involving MtG. It began in a different form from an idea for a program I have, but this particular iteration is...

    Started by R4M3N‎, 08-16-2012 01:08 PM
    • Replies: 2
    • Views: 1,309
    08-16-2012, 01:48 PM Go to last post
  47. Probability problem

    I'm teaching myself the basics of probability using an old book called "A programmed introduction to probability" by J.R.Dixon, published in 1964....

    Started by Jacobite‎, 07-24-2012 02:28 AM
    • Replies: 6
    • Views: 1,919
    08-16-2012, 06:22 AM Go to last post
  48. Probability or Non Probability sampling?

    :wave: Good day guys. I have a problem on the sampling technique i used in my study. I have clustered the barangays of Tagum City into 2 urban and...

    Started by rodhel_09‎, 08-15-2012 08:55 PM
    • Replies: 0
    • Views: 1,608
    08-15-2012, 08:55 PM Go to last post
  49. probabilities of combinations

    Hi, I'm thinking if you can help me think of a better way to solve this. Here's the situation I have probabilities of the number of bags I...

    Started by rikari‎, 08-09-2012 08:48 AM
    combination, probability
    • Replies: 3
    • Views: 1,909
    08-13-2012, 10:36 AM Go to last post
  50. Question Normal Distribution

    Hi all, I need some urgent help with the below questions: 1. Sales of apples are normally distributed with a mean of 500,000 boxes per week and a...

    Started by shyam.uthaman‎, 08-13-2012 08:44 AM
    • Replies: 2
    • Views: 1,196
    08-13-2012, 08:59 AM Go to last post
  51. 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...

    Started by derksheng‎, 08-08-2012 11:35 PM
    • Replies: 7
    • Views: 1,887
    08-09-2012, 10:20 AM Go to last post
  52. Goodness of fit

    Can R^2 be use to test the goodness of fit for the probability distribution of univariate sample?

    Started by lukla‎, 08-09-2012 02:13 AM
    • Replies: 1
    • Views: 1,423
    08-09-2012, 08:30 AM Go to last post
  53. What's wrong with this sample space?

    "A coin is tossed until for the first time the same result appears twice in succession. Describe the sample space." My answer: \Omega :=...

    Started by derksheng‎, 08-07-2012 10:30 AM
    • Replies: 6
    • Views: 2,403
    08-07-2012, 01:08 PM Go to last post
  54. Prediction & Autocorrelation

    I have a set of dependent variables which are serially correlated. I understand the confidence and prediction intervals are actually much broader...

    Started by cisaak‎, 08-07-2012 11:18 AM
    • Replies: 0
    • Views: 1,623
    08-07-2012, 11:18 AM Go to last post
  55. Need help here on probabilities

    Hi, I'm trying to create a template in excel which will give me the probabilities of winning a tennis match. I've done some research already, and...

    Started by rikari‎, 08-06-2012 03:21 AM
    probabilities, tennis
    • Replies: 1
    • Views: 1,431
    08-06-2012, 08:31 AM Go to last post
  56. probability of winning 1st and second

    Hi, I just want to know if what I have here makes any sense to you Here's the problem Suppose i have unknown number of balls in a jar with...

    Started by rikari‎, 08-05-2012 06:19 AM
    first to win, probability
    • Replies: 4
    • Views: 1,583
    08-06-2012, 01:08 AM Go to last post
  57. Probability with sampling question

    i have been having problems with what should be a trivial probability problem Suppose there are 130 patients. Each patient was administered one of...

    Started by hyperion111‎, 08-05-2012 10:39 PM
    2 Pages
    1 2
    conditional probability, probability
    • Replies: 17
    • Views: 4,433
    08-06-2012, 12:18 AM Go to last post
  58. Probability of Independent Events

    Hi, If hypothetical events A and B are independent, with P(B/A)=.4, and P(A)=.3 What is the P(B)? What formula would you use to figure this...

    Started by yzhao5‎, 08-02-2012 04:17 PM
    • Replies: 9
    • Views: 2,382
    08-05-2012, 12:39 PM Go to last post
  59. distribution total number of car accidents in a lifetime of the car

    the number of car accidents every year has Poisson distribution with mean λ and lifetime of the car has exponential distribution with mean 1/μ. how...

    Started by hadiSanji‎, 08-05-2012 08:42 AM
    probability
    • Replies: 1
    • Views: 1,450
    08-05-2012, 09:33 AM Go to last post
  60. Probability Theory Query - Which one?

    I was wondering if an anyone suggest a possible probability theory for a piece of work I'm doing. Essentially I have a sequence of values (all...

    Started by hotchpotch‎, 08-04-2012 06:02 PM
    • Replies: 6
    • Views: 1,591
    08-04-2012, 08:10 PM Go to last post

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