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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: 30,373
    09-30-2005, 09:44 AM Go to last post
  1. Question A question in probability

    i wanna know the difference between P(A∩B) and P(A|B) i don't mean in the law i mean its meaning what i know is P(A∩B) ==> is the probability of A...

    Started by wwonderboy‎, 05-11-2012 08:55 AM
    • Replies: 1
    • Views: 1,624
    05-11-2012, 11:39 AM Go to last post
  2. Exclamation A question on exponential distributions

    from an exponential distribution with expected value 0.2, if i get the mean of 20 observations, then repeat (get another 20) , etc, so in total 1000...

    Started by omega‎, 12-01-2010 07:25 PM
    • Replies: 0
    • Views: 2,056
    12-01-2010, 07:25 PM Go to last post
  3. A question on Poisson distribution

    Hi, Let X1 and X2 be Poisson distributed variables with the same mean m and Y be defined as multiplication of X1 and X2 (Y=X1X2). How can i obtain...

    Started by jylces‎, 06-18-2010 06:46 AM
    • Replies: 2
    • Views: 4,177
    06-18-2010, 12:11 PM Go to last post
  4. A question on probability

    Let X_1, X_2, \ldots, X_{10} be a random sample from N(80, 3^2) distribution. Define S = \sum_{i=1}^{10} U_i T = \sum_{i=1}^{10}\left(...

    Started by kamekaze‎, 01-29-2011 10:25 AM
    • Replies: 9
    • Views: 2,907
    01-30-2011, 11:56 PM Go to last post
  5. A question on the Poisson process

    Let N be a Poisson process with rate 1, T^{(\lambda )} be an exponential random variable with rate \lambda independent of N, and U^{(\lambda)} be...

    Started by tzelios‎, 10-06-2010 03:29 AM
    • Replies: 3
    • Views: 3,206
    10-06-2010, 01:34 PM Go to last post
  6. 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: 1,761
    08-20-2011, 04:21 PM Go to last post
  7. a random number generator problem

    Hello all, I have to resolve the next type of problem: I have a machine that is supposed to generate truely random 0/1 values. If i'm testing...

    Started by misu200‎, 05-17-2007 05:42 PM
    • Replies: 1
    • Views: 3,410
    05-19-2007, 12:07 AM Go to last post
  8. A random variable that is a mix of discrete and continuous

    Here's a question we got for homework: It is given that at a certain bank there's 50-50 chance that when you enter there's: - no one waiting...

    Started by Yotam Ohayon‎, 12-17-2011 07:42 AM
    homework, homework help
    • Replies: 1
    • Views: 2,090
    12-17-2011, 10:58 AM Go to last post
  9. A random variable's median and variance.

    -Part a) A box from 0 to 1 of height 1. What is its median ? Interpretation/Attempt: A random variable, X, is uniform, (So that its density is...

    Started by Kayl‎, 02-09-2017 05:43 AM
    probability mass function
    • Replies: 0
    • Views: 1,772
    02-09-2017, 05:43 AM Go to last post
  10. A reversal of the Birthday Problem

    I hope today finds you well and in good spirits. I am trying to develop a model based, in part, on the Classic Birthday Problem. Looking at...

    Started by statistically_challenged‎, 11-05-2006 05:29 PM
    • Replies: 0
    • Views: 3,451
    11-05-2006, 05:29 PM Go to last post
  11. A self study question for extreme probability....Gaming-Cards.

    No, this does not have to do with any current games on the market.... I have a unique question for anyone that can explain it to me. I'm a bit of a...

    Started by myrlin2k‎, 02-28-2012 11:28 AM
    • Replies: 3
    • Views: 1,722
    02-28-2012, 11:54 AM Go to last post
  12. a short one

    Hi guys, I'm new to this forum, and perhaps there already exist an answer to this question. Anyway here I go, I have an assignment in...

    Started by dhl‎, 02-07-2009 01:45 PM
    • Replies: 5
    • Views: 2,423
    02-09-2009, 08:01 PM Go to last post
  13. Smile A simple but trickly probability question

    My coworker asked me a probability problem. It seems simple, but, maybe not actually. Could anyone help me and take a look at the problem? Your...

    Started by redsolar‎, 06-08-2007 02:04 PM
    • Replies: 2
    • Views: 2,177
    06-09-2007, 05:01 AM Go to last post
  14. Smile A simple expectation problem!

    guys, consider we have N numbers (no equal numbers). we want to find the maximum of these numbers. The method is like this... I choose one of...

    Started by fantasticamir‎, 01-02-2007 05:54 PM
    • Replies: 0
    • Views: 2,010
    01-02-2007, 05:54 PM Go to last post
  15. A simple Probability question....

    MALE FEMALE Thrombosis 10 14 Appendix 15 10 Blood-Pressure 25 18 TOTAL 50 42

    Started by MFaraz_Hayat‎, 10-21-2007 06:02 AM
    • Replies: 1
    • Views: 2,227
    10-21-2007, 09:35 AM Go to last post
  16. A simple probability theory question, but the answer may not be simple.

    Hi, I have the following question. Suppose I draw a measure of 0<m<1 points uniformly without replacement from . What is the probability that less...

    Started by kaoyanone‎, 05-11-2014 03:02 AM
    drawn without replacement, probability, unit interval
    • Replies: 2
    • Views: 1,436
    05-11-2014, 11:45 AM Go to last post
  17. Question A simple problem about normal distribution

    At supermarkets in a Midwestern city the sales of canned tuna varies from week to week. Marketing researchers have determined that there is a...

    Started by jazzpasta‎, 02-07-2012 10:59 AM
    • Replies: 2
    • Views: 7,482
    02-07-2012, 06:01 PM Go to last post
  18. A solitaire game with no possible moves?

    Hi everyone. I just opened a solitaire game on my computer with no moves possible. Does anyone have any idea what the probability of this happening...

    Started by wlawson86‎, 09-21-2006 09:17 PM
    • Replies: 0
    • Views: 2,434
    09-21-2006, 09:17 PM Go to last post
  19. a tricky gaussian problem

    hello everyone, I am stuck with a problem I can't figure. I will try to explain briefly what it is: we run an experiment where we expect 4/9 of...

    Started by statwiz‎, 10-22-2012 06:29 AM
    • Replies: 2
    • Views: 1,319
    10-26-2012, 02:00 PM Go to last post
  20. A Tuberculosis Test....

    :confused: A Tuberculosis Test is given to a sample of 3 TB patients. The test will detects the diease 95% of the time. Let y denote a positive...

    Started by strawberries‎, 12-12-2006 02:37 PM
    • Replies: 2
    • Views: 2,622
    12-13-2006, 12:46 PM Go to last post
  21. A Two Class Probability Problem

    This is a problem that has been bothering me for a while. Say you have 10 'things' and each thing can either be of class A or class B (mutually...

    Started by jensph‎, 03-04-2008 03:25 PM
    • Replies: 0
    • Views: 2,257
    03-04-2008, 03:25 PM Go to last post
  22. A two-outcome game on a limited budget: the probability of being busted over n tries

    Hello, My question does not regard a piece of homework, but I have become stuck trying to solve a statistical problem and I would really...

    Started by smart_mask‎, 11-12-2011 02:43 PM
    binomial distribution, limited budget, two-outcome bet
    • Replies: 2
    • Views: 2,220
    11-13-2011, 03:37 AM Go to last post
  23. A very simple question, I think.

    Hi. I have what I think will be an easy question. Apologies if it's too trivial or if this is the wrong forum, I've never done stats, and really only...

    Started by st@ts‎, 05-29-2010 11:27 AM
    • Replies: 3
    • Views: 3,205
    05-29-2010, 04:04 PM Go to last post
  24. About convergence of a monotonic sequence

    If {X_n} is a monotonically increasing sequence, such that X_1 <= X_2 <= X_3 <= ... and there's some subsequence of {X_nk} of {X_n} such that ...

    Started by evalover1987‎, 10-03-2010 03:26 AM
    • Replies: 0
    • Views: 4,128
    10-03-2010, 03:26 AM Go to last post
  25. Question About marginal densities... confused

    If we have N random variables (not necessarily normal; with some level of correlation) and M observations of them (i.e. we have M N-dimensional...

    Started by kazec‎, 07-13-2007 04:02 AM
    • Replies: 1
    • Views: 2,541
    07-13-2007, 09:38 PM Go to last post
  26. About negative probability

    I found there is a term of "negative probability" in WikiPedia. Here is the link: http://en.wikipedia.org/wiki/Negative_probability I would...

    Started by LigongKarlChen‎, 09-18-2009 09:17 AM
    • Replies: 1
    • Views: 2,279
    10-07-2009, 06:49 PM Go to last post
  27. About sigma field

    Can someone give some tips to prove the statement: C and D are two sets. If C belongs to D, then \sigma(C) belongs to \sigma(D). where...

    Started by egpivo‎, 05-30-2012 05:00 AM
    • Replies: 1
    • Views: 1,684
    05-30-2012, 05:17 AM Go to last post
  28. About the definition of probability

    We know the measurable space of probability is a continuous space of . Then, if a random measure is valued (or defined) on the continuous space , is...

    Started by LigongKarlChen‎, 09-18-2009 09:26 AM
    • Replies: 2
    • Views: 2,855
    10-29-2009, 03:41 PM Go to last post
  29. Post About the definition of random correspondence

    I have a question:"Is there a concepte and a definition on random correspondence in the current Probability Theory?" If there is, how is it...

    Started by LigongKarlChen‎, 03-08-2010 11:17 AM
    • Replies: 0
    • Views: 2,607
    03-08-2010, 11:17 AM Go to last post
  30. Unhappy Absolute risk reduction

    Delete it please

    Started by SadieKhan‎, 09-12-2010 03:38 AM
    • Replies: 0
    • Views: 3,160
    09-12-2010, 03:38 AM Go to last post
  31. Acceptance Testing - Calculating Type 1 and Type 2 Errors

    Removed...

    Started by bluejay‎, 01-27-2015 01:51 AM
    • Replies: 1
    • Views: 1,568
    01-27-2015, 11:25 AM Go to last post
  32. Actuarial Exam P

    Sorry if this isn't really the best place for this question. I passed the exam P and am just trying to figure out how I can determine how many...

    Started by lancearmstrong1313‎, 01-31-2012 01:22 PM
    • Replies: 0
    • Views: 3,623
    01-31-2012, 01:22 PM Go to last post
  33. add chi square or F distributions yields?...

    Hi there, I have two questions: First: X1 follows X^2 distribution with n1 d.f. X2 follows X^2 distribution with n2 d.f. Then what is...

    Started by leo nidas‎, 09-29-2008 04:00 PM
    • Replies: 1
    • Views: 3,476
    09-29-2008, 06:01 PM Go to last post
  34. adding distributions

    Hello, I have a discrete distribution: with a chance of a delay (in hours) I came out of 80 000 measurements to a table with max 40 h delay and...

    Started by thomask‎, 02-22-2016 02:55 AM
    • Replies: 2
    • Views: 1,044
    02-22-2016, 10:09 AM Go to last post
  35. Adding normal distribution - z-scores

    Hi - I have a quick question. I understand that the sum of two normal distributions is a normal distribution. Now let's say I have the z-score...

    Started by kurt9090‎, 06-05-2012 07:36 AM
    • Replies: 5
    • Views: 8,662
    06-05-2012, 09:21 AM Go to last post
  36. Adding squares of dependent random variables

    Hi there, I hope someone in this forum can help me with this problem: I am creating a scalar test statistic from a time series of a vector r(t)=...

    Started by Eisenschneider‎, 05-25-2009 10:08 AM
    • Replies: 2
    • Views: 2,748
    05-26-2009, 01:15 AM Go to last post
  37. Adjusted odd ratio interpretation

    Hi There, I have a question regarding adjusted ODD RATIO interpretation I am trying to interpret a table of results of logistic regression...

    Started by alessandra‎, 06-11-2009 05:47 AM
    • Replies: 1
    • Views: 8,706
    06-11-2009, 08:09 AM Go to last post
  38. Cool Adjusting Fantasy Sports Projections Using Z-Scores

    Hi! Stats newbie here so be nice! :wave: I'm currently working on a projection model for fantasy basketball. I am trying to adjust a player's...

    Started by moonshine‎, 02-21-2014 01:28 PM
    • Replies: 2
    • Views: 2,815
    02-21-2014, 02:02 PM Go to last post
  39. Adjusting ranges of probabilities based on a single variable

    Hi everyone, I've been trying to solve this problem for a few weeks now, but can't think of any solutions. I can't think of how to generalize...

    Started by Duke Silver‎, 06-26-2012 10:34 AM
    • Replies: 2
    • Views: 1,612
    06-26-2012, 10:43 AM Go to last post
  40. Advanced Lotto statistics

    Hi, I posted a similar thread in the "R" posting but thought I'd may as well post here as it is generic as well. To calculate lotto probability...

    Started by richacm‎, 02-25-2009 08:55 PM
    • Replies: 3
    • Views: 2,786
    02-28-2009, 08:21 PM Go to last post
  41. Advantage of reducing process variation?

    The question is, "What is the advantage of reducing process variation, thereby causing process control limits to be at a greater number of standard...

    Started by sukaloop‎, 03-02-2012 02:59 PM
    • Replies: 4
    • Views: 8,219
    03-08-2012, 02:30 PM Go to last post
  42. Advantages of having population-defined parameters?

    Hello peeps. Quick “conceptual”/weird question. While finishing-up my next manuscript, I started thinking that a way to “buff it up” would be to talk...

    Started by spunky‎, 04-14-2016 03:06 PM
    • Replies: 1
    • Views: 1,194
    04-14-2016, 06:06 PM Go to last post
  43. 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: 2,029
    12-02-2011, 11:57 AM Go to last post
  44. Algebra with random variables

    I've done something strange, potentially bad, and i just wanted to check how bad. So i have the p.d.f of waiting time as: ...

    Started by Prometheus‎, 09-15-2015 10:43 AM
    • Replies: 3
    • Views: 1,467
    09-16-2015, 08:40 AM Go to last post
  45. Almost lost 10$ at the bar

    First off, I am kind of drunk, so excuse the simple mistakes. I was just given even odds on a bet on 1 roll of 5 dice. (I didn't take it) Meaning we...

    Started by nofmxc‎, 05-08-2012 03:13 AM
    bar, beer, bet, dice, gamble
    • Replies: 0
    • Views: 1,202
    05-08-2012, 03:13 AM Go to last post
  46. Exclamation Almost sure convergence

    Let Y_n be a simple symmetric random walk on the integers Z, starting in state 0. Define X_n to be 1 if Y_n=0 and 0 otherwise. I have already...

    Started by Amelia‎, 11-22-2009 10:31 AM
    • Replies: 1
    • Views: 4,311
    11-22-2009, 11:05 AM Go to last post
  47. almost sure convergence

    Hi, I've got this question I'm trying solve for days already. Let Xn be random variable = 2 with prob 1/3 and = 1/2 with prob 2/3 Let Zn be...

    Started by chchamp‎, 01-12-2012 01:38 PM
    • Replies: 5
    • Views: 4,298
    01-13-2012, 04:20 AM Go to last post
  48. 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: 9,708
    11-26-2009, 10:23 AM Go to last post
  49. Alternative to chi-squared test needed

    Hi all. I need a goodness of fit test for a situation in which a chi-squared test isn't appropriate - where the sum of the expected values does...

    Started by jdrbaldwin‎, 04-09-2011 05:23 AM
    alternative, bernoulli, chi-square, goodness of fit, sampling
    • Replies: 5
    • Views: 8,134
    04-15-2011, 05:23 PM Go to last post
  50. Am I doing this right?

    :confused: Im not sure if im doing this right. This is the question that I am working on right now. You wish to open a new restaurant and are...

    Started by daisy_lynn‎, 05-11-2007 05:38 PM
    • Replies: 1
    • Views: 2,573
    07-04-2007, 01:44 AM Go to last post
  51. Am I doing this right?

    Here is the problem: According to an opinion poll, 905 of 1393 americans polled believe that america is ready for a woman president. If the...

    Started by skatertink06‎, 03-26-2009 12:43 PM
    • Replies: 0
    • Views: 2,312
    03-26-2009, 12:43 PM Go to last post
  52. Am I on the right track for this one?

    The height of people in a certain population is approx. normally distributed with a mean of 67 inches and a standard deviation of 3.4 inches....

    Started by karen c‎, 02-07-2006 11:56 PM
    • Replies: 4
    • Views: 2,745
    02-08-2006, 12:59 AM Go to last post
  53. Am I on the right track?

    The researcher in Part A decides to compare the difference in the population proportions of supporters for a reduction in funding between taxpayers...

    Started by figs824‎, 01-21-2012 04:44 PM
    • Replies: 1
    • Views: 1,543
    01-21-2012, 11:56 PM Go to last post
  54. Am I right?

    The odds are two to one that when A and B play tennis A wins. Suppose that A and B play two matches. What is the probability that A wins at least...

    Started by structstat‎, 09-01-2006 05:51 PM
    • Replies: 2
    • Views: 4,737
    09-01-2006, 06:37 PM Go to last post
  55. Am I right?

    :confused: Here is the Question. The probablity that one of your new batch of printers will break down has been an unacceptable 0.2 each day. You...

    Started by daxiusa‎, 11-13-2007 04:33 PM
    • Replies: 1
    • Views: 2,377
    11-15-2007, 10:09 PM Go to last post
  56. Am I thinking of this the right way?

    Hi, I'm not sure if I'm thinking of the right way to do this problem: Bacterial cells are often classified by their shapes, the three most common...

    Started by jumblebee‎, 09-26-2015 02:21 PM
    • Replies: 3
    • Views: 2,753
    09-30-2015, 01:02 PM Go to last post
  57. Amateur has a question please

    My wife and I have been married for 30 years. During all this time neither my wife, nor her father (my father-in-law), have had an auto accident. We...

    Started by Forensics1‎, 10-30-2013 08:36 PM
    • Replies: 5
    • Views: 1,937
    11-02-2013, 08:54 PM Go to last post
  58. An abstract mortality question

    A few days ago a 48 year old man died and a 65 year old man did not die. I'm familiar with the mortality tables and the likelihood of, in the US,...

    Started by Outlier‎, 07-29-2010 03:05 PM
    • Replies: 2
    • Views: 3,028
    08-03-2010, 02:09 PM Go to last post
  59. An application of optional sampling theorem to 1-D random walk

    Hello all, I have a question about what wiki has to say about an application of optional sampling theorem to symmetric random walk: * Now...

    Started by lu22‎, 07-29-2011 02:34 PM
    • Replies: 2
    • Views: 3,406
    07-29-2011, 07:18 PM Go to last post
  60. An engineer has observed that the gap times between...

    I am struggling with this question ..please help An engineer has observed that the gap times between vehicles passing a certain point on a...

    Started by Jeff Hardy‎, 12-31-2014 11:19 AM
    • Replies: 2
    • Views: 2,599
    12-31-2014, 04:23 PM Go to last post

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