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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: 30,222
    09-30-2005, 09:44 AM Go to last post
  1. Exclamation Challenge

    E1,E2,....,En are events; P is the probability that at least one of them occurs. a)show that SUM P(Ei)-SUM{i<j}P(EiEj) <= P<= SUM P(Ei) ...

    Started by sajee3a‎, 09-14-2010 02:06 AM
    • Replies: 2
    • Views: 2,722
    09-14-2010, 01:33 PM Go to last post
  2. Question Challenge: Card drawing probability

    Hello everybody, This is my first post because this has been in my head and I couldn't hold it any longer! So here it goes: A friend of mine...

    Started by leon_m‎, 05-03-2016 08:59 AM
    • Replies: 4
    • Views: 1,565
    05-10-2016, 06:32 AM Go to last post
  3. Challenging Probability Question

    An analyst is presented with lists of four stocks and five bonds. He is asked to predict, in order, the two stocks that will yield the highest return...

    Started by anthonys‎, 03-02-2006 05:15 PM
    • Replies: 2
    • Views: 4,077
    03-03-2006, 01:37 AM Go to last post
  4. Challenging probability question

    Hello, I have this question, I need some help with it. In an urn there are 10 balls marked with the numbers 1-10. 4 balls are being chosen...

    Started by Yankel‎, 12-23-2012 04:11 PM
    • Replies: 4
    • Views: 2,606
    12-24-2012, 03:32 AM Go to last post
  5. Challenging probability question (expectation of iterative uniform integer)

    " You start with a number x_0. Let R(x_s) be a random integer drawn uniformly from {0,...,x_s-1}. We now play a game where we draw x_1=R(x_0). If...

    Started by AAAssswww‎, 11-10-2012 02:00 PM
    • Replies: 4
    • Views: 1,585
    11-10-2012, 05:59 PM Go to last post
  6. Chance level binomial, not 1/n

    I have some data which I am going to performed a mixed ANOVA on, however, I think I might need to transform the raw data, but am not sure how to. ...

    Started by thisisnic‎, 08-07-2010 11:24 AM
    • Replies: 5
    • Views: 3,934
    08-10-2010, 09:43 AM Go to last post
  7. Chance of an Occurance

    ok, I am an accountant, not a statistician. Something happened to me personally and I would like to figure out the probability that it would have...

    Started by cdurta‎, 07-28-2013 06:46 PM
    • Replies: 8
    • Views: 2,963
    07-30-2013, 11:49 PM Go to last post
  8. Chance of Beating the House In Roulette

    Hi, I was wondering how I could calculate this. I tried two different methods and got the same answer, but I'm not sure if I'm attacking the problem...

    Started by kxiao‎, 05-19-2013 02:27 PM
    • Replies: 1
    • Views: 2,139
    05-20-2013, 11:55 AM Go to last post
  9. Chance of winning - question

    Hi, I have not figured out how to solve the following questions: 1. Report the chance that Bears wins at least 6 games this year. 2. Compute...

    Started by Alexander1981‎, 07-26-2011 04:09 PM
    • Replies: 2
    • Views: 1,708
    07-28-2011, 02:34 PM Go to last post
  10. Chance/probability

    Hi everyone! This is my first post here, so I'm hoping you guys could help. I'm having some difficulty with this problem: A pharmeceutical company...

    Started by jeffreyS‎, 03-21-2011 04:36 PM
    • Replies: 2
    • Views: 3,505
    03-21-2011, 06:30 PM Go to last post
  11. chances of going first in.. pokemon??!

    ha did the title draw you in? good, cause this is a tricky one. you don't need to know much of anything about Pokemon cards to solve this problem. ...

    Started by trickyhao‎, 11-28-2012 02:18 PM
    • Replies: 3
    • Views: 1,836
    11-28-2012, 05:46 PM Go to last post
  12. Exclamation change of variable help

    1. Let X~Geometric(1/4), and let Y have probability function: pY(y)= 1/6 if y=2 1/12 if y=5 3/4 if y=9 0 otherwise Let W=X+Y. Suppose X and...

    Started by omega‎, 10-31-2010 01:36 PM
    • Replies: 1
    • Views: 2,431
    11-01-2010, 07:53 PM Go to last post
  13. Change variable PDF with less variables than before

    My question is very simple, I have a probability density function that depends on four variables p(x1,x2,x3,x4). Now each of those variables depend...

    Started by f22rumaj‎, 01-18-2016 04:02 PM
    change, pdf, probability, variables
    • Replies: 0
    • Views: 1,113
    01-18-2016, 04:02 PM Go to last post
  14. changing the frequency distribution with out the changing the shape of the disti

    i have frequency table of wind speeds from a measurement site and now i want to use that wind speed frequency table to find out wind speed at a...

    Started by codenamenikky‎, 08-15-2014 01:24 PM
    • Replies: 5
    • Views: 2,154
    08-25-2014, 05:28 PM Go to last post
  15. Changing the units changes the scale and shape of Weibull pdf?

    I don't know how to delete the post.:(

    Started by jpcgandre‎, 05-24-2013 06:14 PM
    parameters, weibull
    • Replies: 0
    • Views: 1,137
    05-24-2013, 06:14 PM Go to last post
  16. Characteristic function of the Gamma distribution

    I have not been able to find anywhere a rigorous derivation of the characteristic function of the Gamma distribution. Any suggestions?

    Started by Pandoga‎, 11-17-2011 12:30 PM
    • Replies: 3
    • Views: 16,123
    11-18-2011, 03:41 AM Go to last post
  17. characterization of multivariate normal distribution by covariances

    Hi, the professor told us that a multivariate normal distribution can be characterized as the only distribution for which zero covariance implies...

    Started by advmc‎, 07-30-2011 03:34 AM
    multivariate normal
    • Replies: 3
    • Views: 3,583
    07-30-2011, 06:50 AM Go to last post
  18. chebishev

    1) a dice is being rolled 360 times. the dice has 1 red side and 5 black. what is the upper bound to the probability of falling on a red side more...

    Started by WeeG‎, 07-22-2009 03:27 PM
    • Replies: 0
    • Views: 1,511
    07-22-2009, 03:27 PM Go to last post
  19. Chebshev Inequality

    Hi! I have the following problem: Suppose X ~ Poisson (Lambda). Show P(X > 2lambda) =< 1/lambda So I wrote out Chebshev's by definition: ...

    Started by jamesmartinn‎, 10-27-2010 03:30 PM
    • Replies: 0
    • Views: 2,414
    10-27-2010, 03:30 PM Go to last post
  20. Chebyshev's Inequality

    We recently had a test question (that I got counted correct) but which I feel like my answer is inadequate. We were told to use the Chebyshev's...

    Started by math_guy314‎, 10-23-2010 06:15 PM
    • Replies: 2
    • Views: 3,794
    10-23-2010, 08:37 PM Go to last post
  21. Chebyshev's inequality and Error bound

    The question -------- Hello everyone.

    Started by odicon‎, 04-07-2011 12:00 AM
    • Replies: 1
    • Views: 3,585
    04-07-2011, 06:15 AM Go to last post
  22. Chebyshev's Inequality problem

    Let X ~ Poisson (lambda). With Chebyshev's Inequality, show that P(X >=2 lambda) <= 1/lambda The way I thought to interpret this theorem was...

    Started by greg6363‎, 09-27-2016 12:08 AM
    • Replies: 9
    • Views: 2,539
    09-27-2016, 09:46 PM Go to last post
  23. Chebyshev's theorem and empirical rule

    can someone please explain how to do this problem? I am so confused! Assume the distribution of weights of US adults are normally distributed...

    Started by vintageglam09‎, 12-09-2008 02:20 AM
    • Replies: 5
    • Views: 11,048
    12-10-2008, 02:04 PM Go to last post
  24. Checking over answers

    hey could you guys tell me if i got these correct because there are some I'm unsure on the method thanks :wave: X-Exp(0.3) then find P(X>15|X>10)...

    Started by pure_zero‎, 05-11-2010 07:48 PM
    • Replies: 6
    • Views: 3,579
    05-13-2010, 04:15 AM Go to last post
  25. Chess probability of winning

    I've gotten into Chess recently with this app on my iphone and its gotten me thinking...has anyone worked with statistical algorithms for chess...

    Started by Link‎, 01-14-2011 07:12 PM
    • Replies: 3
    • Views: 6,831
    01-17-2011, 03:11 PM Go to last post
  26. 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: 8,657
    05-06-2008, 12:28 PM Go to last post
  27. Chi Square Test-Who's correct? Me or Prof

    You are instructed to prepare 3 different types of pastry, all containing 16 blueberries per pastry. 6 customers approach you to complain that there...

    Started by jnorm2005‎, 10-20-2011 04:58 PM
    • Replies: 1
    • Views: 3,188
    10-20-2011, 05:25 PM Go to last post
  28. Chi square test: how to solve this one ?

    A dentist observed that most of the patients have cavities in their teeths at the right-side of their mouth. (see data: observed values) The...

    Started by IntoTheLibrary‎, 09-16-2014 08:59 AM
    • Replies: 1
    • Views: 1,286
    10-08-2014, 10:14 AM Go to last post
  29. Question Chi Squared : Explaining the numbers

    Hello! Thank you in advance for your help and I hope I have posted this in the correct section. My question involves verbally explaining chi...

    Started by Noah41‎, 04-10-2012 06:50 AM
    • Replies: 2
    • Views: 4,386
    04-11-2012, 02:49 AM Go to last post
  30. Chi squared probability

    If W/4 ~ Chi-Squared with some degrees of freedom and hence we find that: P(a/4 < W/4< b/4 ) = 0.056 then is it correct to say that:...

    Started by spairos‎, 01-02-2014 10:51 PM
    • Replies: 1
    • Views: 1,905
    01-02-2014, 11:42 PM Go to last post
  31. Chi squared test, what does it say?

    Hi! I am trying to compare to groups with each other (conflict, no conflict ) in relation to health ( bad or good). The result shown in the...

    Started by Georges‎, 04-20-2012 06:14 AM
    • Replies: 0
    • Views: 1,287
    04-20-2012, 06:14 AM Go to last post
  32. 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: 9,521
    02-18-2012, 05:50 PM Go to last post
  33. Chi-Square Test

    Hi guys, Was hoping that someone can help me with a Chi-Square test I'm attemtping. I understand the mechanics of the test and how to...

    Started by jpkoch74‎, 06-08-2009 05:48 AM
    • Replies: 9
    • Views: 4,970
    06-09-2009, 07:23 AM Go to last post
  34. Chi-squared and T distribution, just need a check

    These problems where review from a prior class, i think they are correct but not positive. Q1. Using the T distribution, find the following and...

    Started by MikeM‎, 08-27-2011 07:45 PM
    • Replies: 1
    • Views: 2,022
    08-31-2011, 12:03 PM Go to last post
  35. Children Gender Split Probability Question

    Hello everyone, I've another question on probability (: A randomly chosen family has 4 children. Assume that the chance of having a son or a...

    Started by mysterdusk‎, 09-30-2010 09:56 AM
    • Replies: 1
    • Views: 4,156
    09-30-2010, 10:02 AM Go to last post
  36. CHI^2 test for binomial variables which are not normally distributed

    Hello, Assume that you have X_1\cdot X_n independant random variables. If they are normally distributed we can use the Chi^2 statistical test to...

    Started by CBW‎, 06-10-2015 07:59 AM
    • Replies: 0
    • Views: 886
    06-10-2015, 07:59 AM Go to last post
  37. Smile Chi² distribution link with standard normal distribution?

    Hello, The chi² distribution is the sum of n random standard normal variables. It's used for example to know if a distribution fits the uniform...

    Started by Eometh‎, 04-28-2017 09:27 AM
    • Replies: 4
    • Views: 1,658
    04-30-2017, 04:26 AM Go to last post
  38. Choice probability

    I need to calculate the binary choice probabilty of 2 alternatives i and j- Each of the alternative is charectarised with a part of measurable and...

    Started by Arefe‎, 08-29-2011 03:56 PM
    choice probability
    • Replies: 1
    • Views: 2,424
    08-31-2011, 11:59 AM Go to last post
  39. choosing the right distribution

    I am in a queueing networks class. From what I have read so far, the distributions of the arrival patterns and service patterns need to be...

    Started by nurban‎, 09-04-2009 06:51 PM
    • Replies: 0
    • Views: 2,873
    09-04-2009, 06:51 PM Go to last post
  40. Christmas Present Problem

    May be this is a simple problem for the professionals but its driving me mad. Here is the problem: At Christmas time a group of people at work,...

    Started by elko‎, 01-12-2008 09:03 AM
    • Replies: 10
    • Views: 3,101
    01-17-2008, 02:01 PM Go to last post
  41. Chuck-a-luck

    in the game chuck-a-luck, three dice are rolled. A player bets a certain amount (say $1) on a number from one to six. If the number appears on one...

    Started by Whitney‎, 10-04-2006 11:23 PM
    • Replies: 0
    • Views: 3,831
    10-04-2006, 11:23 PM Go to last post
  42. circuit failure

    A message is transmitted using a binary code of 0's and 1's. Each transmitted bit (0 or 1) must pass through three relays before reaching a receiver....

    Started by roldy‎, 09-10-2007 11:26 PM
    • Replies: 1
    • Views: 4,437
    09-11-2007, 12:17 AM Go to last post
  43. circular permutation

    Hello: I have a probability problem I would like some takes on, please. "There are 5 boys and 3 girls sitting around a circular table. What is...

    Started by galactus‎, 08-10-2006 10:29 AM
    • Replies: 5
    • Views: 4,383
    08-17-2006, 09:41 AM Go to last post
  44. CJD problem

    In a large corporation, people over age 30 have an annual income whose distribution can be approximated normally ~ ($60K, $100,000,000) with SD =...

    Started by StatStudent3‎, 11-13-2010 02:47 PM
    • Replies: 7
    • Views: 3,211
    11-14-2010, 08:19 AM Go to last post
  45. Classical Probability

    Greetings from new comer! Here is my question I could not figure it out by myself: There are two types of bags H and R in a single box (black box...

    Started by yifang‎, 10-06-2011 03:59 PM
    classical bayesian, probability estimate
    • Replies: 5
    • Views: 2,406
    10-06-2011, 08:09 PM Go to last post
  46. Classical Probability and Relative Frequency Probability Approach

    As classical Probability uses mathematical formula for calculation and events are equally likely. As I know Binomial distribution is used for...

    Started by sachinner‎, 01-15-2013 10:11 AM
    • Replies: 0
    • Views: 5,330
    01-15-2013, 10:11 AM Go to last post
  47. classical probability question...

    Hello to all experts, I need help with this, I am lost... A manager of an IT company gives randomly 8 projects to 4 teams, with equal...

    Started by Yankel‎, 01-16-2011 02:45 PM
    • Replies: 1
    • Views: 2,612
    01-16-2011, 02:51 PM Go to last post
  48. 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: 2,279
    08-29-2012, 11:48 AM Go to last post
  49. Closed form formula for the non central moments of normal distribution?

    What is the formula for the nth non-central moments of the normal distribution.

    Started by stephanie‎, 01-25-2014 08:05 PM
    • Replies: 1
    • Views: 4,162
    01-25-2014, 08:50 PM Go to last post
  50. Closing Difference between two numbers with confidence limits.

    Company A tested its widgets and found that when they tested 10000 of them, 2010 of them failed. They tested the widgets of their competition but...

    Started by guitmusic11‎, 10-17-2014 02:26 PM
    • Replies: 0
    • Views: 1,040
    10-17-2014, 02:26 PM Go to last post
  51. Clt

    This seems like it should be easy but for some reason, I'm not seeing it. Suppose we pick at random and independently 100 numbers in the interval ...

    Started by gambs‎, 08-04-2009 02:45 PM
    • Replies: 0
    • Views: 1,710
    08-04-2009, 02:45 PM Go to last post
  52. Question CLT problem

    Let X_1,X_2,...X_n be a sequence of independent random variables. Suppose for k=1,2,3,.... P(X_{2k-1}=1)=P(X_{2k-1}=-1)=\frac{1}{2} and the pdf of...

    Started by Sambit‎, 01-25-2011 02:19 AM
    • Replies: 2
    • Views: 3,049
    01-26-2011, 01:59 AM Go to last post
  53. cluster

    Hi there, Suppose I have some variables (among others of several types) measured in likert scale and need to cluster my data according to these...

    Started by leo nidas‎, 01-29-2010 08:15 PM
    • Replies: 1
    • Views: 2,897
    01-29-2010, 10:17 PM Go to last post
  54. Clustering in SPSS

    Hi, This forum has been of great help so far. THANKS. I have another question.:p I have some 170 cases which I want to classify according...

    Started by weakatstats‎, 08-16-2010 07:32 PM
    • Replies: 4
    • Views: 3,380
    08-18-2010, 04:36 PM Go to last post
  55. Coin A Coin B

    Coin A is flipped 3 times and coin B 4 times. What is the probability that the number of tails obtained from flipping the 2 fair coins is the same?

    Started by Whitney‎, 10-04-2006 11:15 PM
    • Replies: 4
    • Views: 2,748
    10-11-2006, 11:11 AM Go to last post
  56. Cool Coin and die probability

    If I repeatedly and alternately toss a coin and roll a 6 sided die beginning with the coin what is probability of getting a head before a 6

    Started by Birdkid2‎, 02-14-2016 05:09 PM
    • Replies: 6
    • Views: 1,506
    02-16-2016, 01:38 PM Go to last post
  57. Coin Filpping Probability

    I am trying to review for a test for my Probability course. This question is on myu review and I was wondering if anyone could help me with it? ...

    Started by rmn1123‎, 04-15-2009 08:40 PM
    • Replies: 1
    • Views: 2,693
    04-16-2009, 01:12 PM Go to last post
  58. Coin Fliipping or Rats at Vertices

    I'm aware that if you play the coin flipping game where the winner is the first to get a head the player who goes first has a 2/3 chance of winning....

    Started by Banz‎, 04-01-2012 12:14 PM
    • Replies: 1
    • Views: 1,952
    04-01-2012, 02:01 PM Go to last post
  59. Coin Flip and calling randomly

    If there is a coin flip contest and there is a coin flipper continuously flipping the coin and there are three contestants 1. Always Calls Heads...

    Started by codenamenikky‎, 03-07-2014 05:06 PM
    basic probability, coin flips
    • Replies: 5
    • Views: 1,596
    03-10-2014, 08:47 AM Go to last post
  60. Coin flip explanation

    Hi, I have been wondering about a probability question. Suppose you have a 50% chance of winning $1 when you flip a coin. You also have a 50%...

    Started by numbersman‎, 04-06-2016 02:50 AM
    • Replies: 1
    • Views: 1,184
    04-06-2016, 04:07 AM Go to last post

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