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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: 30,371
    09-30-2005, 09:44 AM Go to last post
  1. Resolution of your sample size and Confidence Intervals

    I'm look for some generalized guidance. Let's say I have 200 stores. I test 10 of these for a month doing some sort of specialized promotion. I...

    Started by cmorin‎, 12-13-2013 07:30 PM
    • Replies: 0
    • Views: 1,457
    12-13-2013, 07:30 PM Go to last post
  2. 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: 1,611
    03-10-2014, 08:47 AM Go to last post
  3. 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: 2,167
    08-25-2014, 05:28 PM Go to last post
  4. Calculating a stochastic matrix with multiple states

    I am struggling with how to calculate the values of a Markov matrix which has multiple states. For example, Imagine an unfair 6 sided dice. The...

    Started by Codetemplar‎, 07-12-2015 07:42 AM
    • Replies: 1
    • Views: 1,183
    07-14-2015, 11:02 AM Go to last post
  5. Exam Question Probability.

    Pretty straightforward question, I just want to double check what I told a friend. She has 11 exam questions to study for, only 6 of these will be...

    Started by Cohen's monkey‎, 06-17-2008 09:19 PM
    • Replies: 3
    • Views: 5,207
    06-20-2008, 01:36 AM Go to last post
  6. introduction to stochastic process by by Hoel, Port and Stone.

    those any one have this text. i have gone through all the questions in chapter 1 except for two prove questions. no 27 and 26 i am lost

    Started by colltie‎, 01-26-2009 11:40 AM
    • Replies: 6
    • Views: 13,180
    07-16-2010, 02:05 PM Go to last post
  7. need push in the right direction (markov chain)

    i have done almost every question on the first chapter but the proofs on question 26,and 27 have me lost. i need help

    Started by colltie‎, 01-28-2009 11:26 AM
    • Replies: 0
    • Views: 2,144
    01-28-2009, 11:26 AM Go to last post
  8. Question UK Sports Sweepstake Question

    Hi, my friends have been having many conversations on the following subject and can't seem to find an answer anywhere and now we have a little...

    Started by colonelvern‎, 01-12-2010 02:04 PM
    • Replies: 2
    • Views: 3,790
    01-17-2010, 10:39 AM Go to last post
  9. Apartment vacancy question

    My friend is in this exact situation and we are having trouble figuring out the probability - please help! She is looking for a top-floor...

    Started by Colryk‎, 12-18-2013 11:16 PM
    probability help
    • Replies: 2
    • Views: 1,292
    12-19-2013, 05:52 PM Go to last post
  10. Question Stats question: random balls

    There is a pool of 4500 unique balls. There are 3 people, called X, Y and Z, who are blindfolded. They take turns to take out as many balls as they...

    Started by Combo9‎, 08-02-2009 11:34 AM
    • Replies: 3
    • Views: 3,603
    09-03-2009, 07:22 PM Go to last post
  11. Lottery Draft Question

    Hi! I'm trying to figure out the odds of each team getting each pick in our NHL fantasy league lottery draft. It is somewhat modeled after the...

    Started by Commissioner_rumY‎, 03-01-2012 01:00 AM
    • Replies: 1
    • Views: 3,139
    03-01-2012, 02:08 AM Go to last post
  12. How can I estimate the traffic

    Hi, I'm trying to make some computer system load estimations, but I'm not sure I have all the data I need for that. I have a machine that will...

    Started by comopasta‎, 02-16-2009 03:02 AM
    • Replies: 1
    • Views: 2,679
    02-16-2009, 10:14 AM Go to last post
  13. how many combinations ?

    4 numbers with each can be from 1 to 49. e.g. 1,2,3,4 1,2,3,5 1,2,3,6 1,2,3,7 but exclude depublication that is 2,1,3,4 or...

    Started by computeruser08‎, 01-29-2009 06:53 PM
    • Replies: 4
    • Views: 3,965
    01-29-2009, 10:02 PM Go to last post
  14. Probability - Law of multiplication?

    I'm reading about probability and encountered this problem: http://imgur.com/6xTM9Z1 (I guess the answer of a is 1-0,37=0,63 which is the...

    Started by Concret‎, 11-12-2014 10:07 AM
    • Replies: 0
    • Views: 1,079
    11-12-2014, 10:07 AM Go to last post
  15. PDF and Mean

    I have a couple of question here I can't figure out. Does anyone know how to prove these? And can you explain why? Find the probability density...

    Started by congers@yoeric.com‎, 01-31-2006 10:57 AM
    • Replies: 1
    • Views: 2,446
    01-31-2006, 11:22 PM Go to last post
  16. Question MLE of range of Uniform(a,b)

    So, I want an MLE for (b - a). log L(a,b|x) = -n log (b - a) given a < x_(1) and b > x_(n) but d/da log L gives me n/(b-a) >, and in fact =/=...

    Started by conundrum‎, 03-16-2011 06:47 PM
    mle, mvue, uniform
    • Replies: 9
    • Views: 10,947
    03-17-2011, 12:13 PM Go to last post
  17. (What may be) A beginner problem!

    Just as a disclaimer, I have never taken a probability or stats course, so please excuse me for not being up to snuff around here. Anyhow, for my CS...

    Started by coogan‎, 04-25-2013 11:08 AM
    • Replies: 0
    • Views: 1,510
    04-25-2013, 11:08 AM Go to last post
  18. Gamma/poisson distribution

    Suppose that ‘serious’ road accidents happen on a regional road in accordance with a Poisson process with a rate of 2.3 per week. Let T1 be the...

    Started by Cookie‎, 05-25-2010 07:17 AM
    • Replies: 1
    • Views: 6,275
    05-25-2010, 08:36 AM Go to last post
  19. Poisson distribution

    The number of cars that pass Bill's house between 8.00am and 9.00am on a normal week day follows a poisson process with rate 6 cars every 5 minutes....

    Started by Cookie‎, 08-03-2010 06:06 AM
    • Replies: 2
    • Views: 3,421
    08-03-2010, 10:13 AM Go to last post
  20. True or false?

    Is this statement true or false? The central limit theorem says that, as n tends to infinity the distribution of (Y - E(Y))/Standard deviation...

    Started by Cookie‎, 08-23-2010 09:08 PM
    • Replies: 10
    • Views: 5,338
    08-24-2010, 11:26 PM Go to last post
  21. Probabilty of picking higher number

    I am working on a webbased game, and need help with some probability. Player A rolls a 20 sided die with the numbers 1 through 20. Player B rolls...

    Started by coolant‎, 07-23-2008 06:49 PM
    • Replies: 12
    • Views: 3,555
    08-28-2008, 12:02 AM Go to last post
  22. Please help with Binomial Distribution probabilities

    a fair six sided die is rolled 5 times and the number of 6's are counted. find n and p. Find the probability of exactly two 6's. I know that n=5...

    Started by coolbeans‎, 11-17-2009 04:36 PM
    • Replies: 2
    • Views: 3,626
    11-17-2009, 09:49 PM Go to last post
  23. *Rate of Ruin & Optimal N

    For a fair coin toss game, both prob(ruin) & prob(consecutive losses) increases with no. of trials. Is the Rate of ruin .i.e.where prob(ruin)...

    Started by coolcat‎, 11-26-2011 02:53 AM
    • Replies: 13
    • Views: 3,894
    11-28-2011, 12:21 PM Go to last post
  24. What is the number of combinations for a 6XN combination lock?

    Hi, does anyone know how to calculate the total number of combinations a 6XN combination lock .i.e. each of the 6 wheel columns has N possible...

    Started by coolcat‎, 12-26-2011 11:39 AM
    • Replies: 5
    • Views: 1,915
    12-26-2011, 02:02 PM Go to last post
  25. Fano plane concept applied to lottery combinatorics

    I came across an interesting combinatorics optimisation description for 14numbers. Maybe someone good in combinatorics can expand this fano plane...

    Started by coolcat‎, 03-30-2012 11:46 AM
    • Replies: 2
    • Views: 2,489
    03-30-2012, 12:58 PM Go to last post
  26. Roulette probability

    I am really struggling with this.... any help will be greatly appreciated Consider the following three methods of betting reds on a roulette...

    Started by coolgirl2004‎, 11-28-2012 08:59 PM
    probability, roulette
    • Replies: 1
    • Views: 1,937
    11-28-2012, 09:08 PM Go to last post
  27. Question Exception Rate Prediction

    I have a piece of software which logs a successful transaction with a particular code of S and a failure/exception with a code of E. The software...

    Started by coowboy‎, 02-02-2007 12:08 PM
    • Replies: 1
    • Views: 2,958
    02-06-2007, 07:15 PM Go to last post
  28. Calculating special lottery odds

    #s out of a bag! Hello, I would appreciate anyone's help in this problem: There are 11 balls in a bag numbered 0-10. You get 6 picks out of...

    Started by Copperfil‎, 11-16-2015 09:49 PM
    #lottery, #odds, #probability
    • Replies: 4
    • Views: 1,327
    11-24-2015, 12:54 AM Go to last post
  29. Probability problem

    Find the conditional probalilities of the indicated events when two fair dice (one red and one green) are rolled: The sum is 6, given that the...

    Started by Coral.ys‎, 10-02-2011 03:59 PM
    help me!, plese
    • Replies: 5
    • Views: 6,733
    10-02-2011, 05:12 PM Go to last post
  30. Dice Probability (2d6, 3d6, 4d6)

    I would like to find the probabilities of rolling a result using different numbers of six-sided dice. I am looking for the best way to figure out the...

    Started by Corkle‎, 05-08-2014 02:36 AM
    • Replies: 2
    • Views: 6,025
    05-10-2014, 12:50 AM Go to last post
  31. HW help

    I have a probelm with one of my hw questions which is: A sample from a normal population has a standard deviation of 0.02. What is the...

    Started by corkscrew‎, 10-09-2008 02:28 PM
    • Replies: 0
    • Views: 2,743
    10-09-2008, 02:28 PM Go to last post
  32. Conditional ev,big problem with definition

    I jus dont seem to understand this concept "conditional e.v." I do know the definitions: joint density f_X,Y , conditional density of X given Y=y,...

    Started by corneel‎, 08-27-2010 09:38 PM
    • Replies: 3
    • Views: 3,114
    08-28-2010, 12:26 PM Go to last post
  33. Trying to predict a trend

    The chart below displays what percentage of bankruptcies are filed each year, by region, due to medical costs. If I'm trying to predict how many...

    Started by cornfused squared‎, 04-28-2009 02:40 PM
    • Replies: 1
    • Views: 3,499
    04-28-2009, 09:06 PM Go to last post
  34. Probabilities in a 7-game series

    This probably isn't relevant, but this is not homework help. I'm just a curious adult who hasn't taken a stastics class in a few years so I'm pretty...

    Started by cornonthecob‎, 01-11-2012 03:09 PM
    • Replies: 3
    • Views: 5,109
    01-11-2012, 03:36 PM Go to last post
  35. Joint distribution question

    Let X and Y be independent random variables with an exponential distribution with parameters µ and λ (note that the exponential distribution is given...

    Started by corny1355‎, 11-09-2007 01:40 PM
    • Replies: 0
    • Views: 2,825
    11-09-2007, 01:40 PM Go to last post
  36. Generating function

    Hi, I'm stuck on this problem. If anyone could help, it would be really appreciated! Find the generating function for the negative binomial...

    Started by cornzox5342‎, 10-19-2007 08:21 PM
    • Replies: 0
    • Views: 2,481
    10-19-2007, 08:21 PM Go to last post
  37. Hypothesis testing : Help to formulate null hypothesis

    Hi all I'm currently doing a hypothesis testing to test a set of sample data (large sample size). From my knowledge of statistics, the null...

    Started by Corsa‎, 06-09-2014 01:32 AM
    • Replies: 3
    • Views: 1,865
    06-10-2014, 07:16 AM Go to last post
  38. Probability Scenario

    Here’s the scenario: A committee of 9 people is deciding which 5 people of 14 candidates should be hired for a job. In order to be hired, a...

    Started by CORWU671‎, 02-23-2016 10:14 AM
    • Replies: 4
    • Views: 1,755
    02-25-2016, 07:02 PM Go to last post
  39. How to get this Z value?

    P<=.667 Z.667 = .432 My question is how to get .432 by using the cumulative normal probability table(z-values). Thanks for your help,...

    Started by corydi‎, 05-03-2007 11:16 PM
    • Replies: 1
    • Views: 2,293
    05-05-2007, 03:16 PM Go to last post
  40. Trying to calculate confidence intervals

    Hi everyone. The numbers below are the annual maintenance costs of a program I am working on. I'd like to use the data set to estimate future costs...

    Started by costgeek‎, 07-08-2015 09:11 AM
    cdf, confidence, distribution, probability
    • Replies: 2
    • Views: 2,004
    07-08-2015, 10:02 AM Go to last post
  41. Expectd Value for ranges

    I hope someone can help me with this expected value question: Total Number of Admissions/Probability 950,000 to 1,050,000/ ...

    Started by coststats‎, 02-02-2009 11:48 PM
    • Replies: 2
    • Views: 2,690
    02-03-2009, 02:34 PM Go to last post
  42. Bayes' Theorem applied to poker?

    please delete this post

    Started by coveby‎, 06-01-2014 05:46 AM
    poker bayes theorem
    • Replies: 1
    • Views: 1,875
    06-01-2014, 11:00 AM Go to last post
  43. Normality of predictors - negative binomial regression

    Hi guys, As a part of my current research project I'm conducting a sequence of negative binomial regressions with counts of crime offences from...

    Started by CowboyBear‎, 03-03-2009 08:10 PM
    • Replies: 2
    • Views: 5,040
    03-06-2009, 09:02 PM Go to last post
  44. U.S. diversity index problem

    Hi, everyone. I'm having a little bit of trouble with this problem: The U.S. Census measures the diversity of a population by calculating a...

    Started by cowmoose‎, 01-19-2009 12:23 AM
    • Replies: 2
    • Views: 3,143
    01-19-2009, 07:13 PM Go to last post
  45. How do you multiply a probability times a probability?

    Just a non-math guy needing help from some math guys so I can finish an article for a magazine! I know it's easy to do, I just don't know how. ...

    Started by cpaavola‎, 01-19-2010 09:38 PM
    • Replies: 10
    • Views: 5,360
    01-20-2010, 01:05 PM Go to last post
  46. How do I add percentages?

    For instance, let's say a person is a truck driver and there's an: 80% chance of they smoke 40% chance of they are overweight 60% chance of they...

    Started by cpaavola‎, 04-30-2010 11:30 AM
    • Replies: 4
    • Views: 8,008
    05-03-2010, 11:15 AM Go to last post
  47. Poisson Question

    I'm not a stat guy by any means, so I want to check my thinking here. Let's say a football player scored 11 Touchdowns in 16 games for an average...

    Started by cpaavola‎, 06-01-2011 03:16 PM
    • Replies: 7
    • Views: 2,689
    06-01-2011, 07:02 PM Go to last post
  48. Help me please (homework)

    -Suppose a measurement of A has been made over a large population -5% of those population are positive for A -if A is measured on the same subject...

    Started by cpalad‎, 10-02-2007 04:40 PM
    • Replies: 1
    • Views: 2,460
    10-03-2007, 05:23 AM Go to last post
  49. Help me please.. (expected value) Thanks

    Suppose that 20 percent of the students who took a certain test were from school A and the average of their scores on the test was 65. Also,...

    Started by cpalad‎, 02-15-2008 03:42 PM
    • Replies: 1
    • Views: 2,847
    02-16-2008, 03:51 PM Go to last post
  50. Poisson Distribution

    Can anyone help me with this poisson question The number of spelling errors per 1000 words made by a typist has a Poisson distribution with a mean...

    Started by craig1234‎, 03-26-2006 09:30 AM
    • Replies: 3
    • Views: 2,896
    03-27-2006, 01:32 PM Go to last post
  51. binomial distribution question

    A currier service receives parcels and forwards them to their destination. The aim is to forward all parcels within 24 hours but is not always...

    Started by craig1234‎, 03-27-2006 05:03 PM
    • Replies: 1
    • Views: 2,736
    03-28-2006, 04:13 PM Go to last post
  52. Validity of setting constant to zero

    Can anyone tell me the validity of setting the constant term to zero to make the other coefficients pass significance? I have been sent a multiple...

    Started by craigpollard‎, 05-07-2009 03:56 PM
    • Replies: 3
    • Views: 8,402
    05-13-2009, 05:32 PM Go to last post
  53. need help with these 2 questions

    a) Profits (denoted as X) 100 normally distributed mean value of 1.5 mi and a (s.d.) of 120,000. Calculate P (X < $1 million) -4.66 is that...

    Started by crashuk‎, 06-09-2008 12:00 AM
    • Replies: 3
    • Views: 3,202
    06-17-2008, 11:46 AM Go to last post
  54. Probability of Absolute Return

    Mean = 0.04% SD = 1.9% of a percentage rate of return recorded daily for one year on an asset. What is the probability of an absolute return on any...

    Started by crazyforyou99‎, 10-21-2014 05:36 AM
    • Replies: 0
    • Views: 1,379
    10-21-2014, 05:36 AM Go to last post
  55. Corrected significance level in Tukey HSD post-hocs?

    Dear all, I have a question that is really bugging me: I'm testing if seed set in one plant species is impacted by the deposition of pollen...

    Started by crazy_man‎, 10-24-2007 08:33 AM
    • Replies: 1
    • Views: 4,109
    10-28-2007, 06:31 PM Go to last post
  56. Pie slices

    Hi all, I would like to know what the probability distribution for the number of pie slices could be. Or the stochastic process behind slicing....

    Started by creditrisk‎, 09-17-2006 12:53 PM
    • Replies: 0
    • Views: 1,944
    09-17-2006, 12:53 PM Go to last post
  57. Conditional Probability question

    okay the problem statement is as follows A gene can be either type A or type B (ie note type A). A gene can also be either dominant or regressive....

    Started by Creol‎, 10-08-2008 12:54 PM
    • Replies: 3
    • Views: 2,538
    10-09-2008, 11:21 AM Go to last post
  58. 15 people (including you) apply for 7 jobs. What are your chances of getting the job?

    Hi :wave: Allow me to extend my thanks to you all for taking the time to visit this thread. I came across this seemingly simple probability...

    Started by cridex‎, 12-29-2011 12:08 PM
    2 Pages
    1 2
    probability question
    • Replies: 16
    • Views: 7,262
    12-30-2011, 02:39 PM Go to last post
  59. probability generating function

    Hi All, I'm new to the forum. I'm trying to learn a bit of statistics on my own (as a pastime) but I'm stuck with this problem: I have two...

    Started by cristiano‎, 01-05-2008 10:01 AM
    • Replies: 0
    • Views: 3,068
    01-05-2008, 10:01 AM Go to last post
  60. Simple Set THeory/Probability Problem

    Hello all, I'm very new to statistics as well as this forum, so please bear with me. I've tried solving this for about 30 minutes now and I've...

    Started by crk05‎, 09-19-2017 11:29 PM
    beginner, probability, set theory
    • Replies: 4
    • Views: 257
    09-20-2017, 02:16 PM Go to last post

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