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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: 30,190
    09-30-2005, 09:44 AM Go to last post
  1. Stuck on this...

    I'm kind of stuck on my homework. I was given a chart of a total of 1052 people (men 495, women 557) in four categories: nonsmokers (men 335,...

    Started by mayday‎, 02-26-2006 09:27 PM
    • Replies: 1
    • Views: 3,267
    02-26-2006, 10:39 PM Go to last post
  2. Question In a certain town....

    40% of voters favor a given ballot measure. For groups of 22 voters, find the mean and standard deviation for the number who favor the measure.

    Started by mayday‎, 03-19-2006 10:21 PM
    • Replies: 0
    • Views: 4,296
    03-19-2006, 10:21 PM Go to last post
  3. Question Normal Distribution

    Assume x has a normal distribution, and find the indicated probability. The mean is 200, standard deviation 50. Find the following probability: ...

    Started by mayday‎, 04-08-2006 12:28 PM
    • Replies: 3
    • Views: 3,400
    04-08-2006, 02:59 PM Go to last post
  4. Lottery draw question (hypothetical)

    I'm new to the forum, and certainly no math wizz, but I'm hoping someone can help me with a hypothetical lottery problem. Basic setup: there are...

    Started by Mayk‎, 08-20-2009 07:56 AM
    • Replies: 1
    • Views: 3,080
    08-21-2009, 05:01 AM Go to last post
  5. Mr

    Need to simultaneneously compare child-woman ratios of two censuses presented in 2 (4*7) tables;4 educational categories and 7 age-groups. Any...

    Started by MAYSAL‎, 03-31-2009 06:04 PM
    • Replies: 5
    • Views: 2,385
    04-01-2009, 04:56 PM Go to last post
  6. lizards probability question

    Note: This is not homework, I am a Biologist trying to learn basic statistics. Hi, I am trying to learn basic probability and I would like to get...

    Started by mazatlan‎, 12-14-2013 11:42 PM
    • Replies: 0
    • Views: 1,743
    12-14-2013, 11:42 PM Go to last post
  7. Please help me to judge if a 'random' draw was fixed !

    40 teams are taking place in a knock-out competition in which there is no seeding. They all have rankings determined by previous performance. The...

    Started by mazza47‎, 10-11-2012 03:49 AM
    • Replies: 1
    • Views: 1,114
    10-11-2012, 09:26 AM Go to last post
  8. Trying to calculate Prize Odds

    am currently trying to come up with the odds on picking a perfect fantasy football lineup. I see NFL.com has a challenge of picking a perfect NFL...

    Started by mbodenheimer‎, 08-20-2013 03:30 PM
    • Replies: 1
    • Views: 1,198
    08-20-2013, 03:59 PM Go to last post
  9. Simple probability

    If I have: The year of eruption The month of eruption 1660 July 1682 August 1694 April 1698 January 1707 July 1737 May 1760 March

    Started by mboricgs‎, 12-01-2013 02:49 PM
    • Replies: 2
    • Views: 2,023
    12-03-2013, 08:48 AM Go to last post
  10. Fishing Probability

    The probability that Pete will catch fish on a particular day when he goes fishing is .8. Pete is going fishing 3 days next week. The probability...

    Started by mbusa‎, 04-22-2012 03:44 PM
    • Replies: 1
    • Views: 6,368
    04-22-2012, 04:17 PM Go to last post
  11. Post What do you think ?

    I am new to stats so I need help They have also asked the probability of an individual consumer receiving a prize over the course of a year. For...

    Started by mcafeep‎, 02-23-2006 10:51 AM
    • Replies: 2
    • Views: 2,119
    02-23-2006, 01:07 PM Go to last post
  12. Variances in Predictions?

    Hi All: I am new to this forum, but glad that i have found it! I posted this in the statistics forum but it may be better suited here. ...

    Started by MCALVIN‎, 11-28-2008 12:26 PM
    • Replies: 0
    • Views: 2,683
    11-28-2008, 12:26 PM Go to last post
  13. Pdf of peak-to-peak value given n trials from a normal distribution

    Im trying to find the pdf for the peak-to-peak value of n events from a normal distribution. I was hoping to use this to help me compare some...

    Started by mcantre‎, 01-23-2014 02:07 PM
    • Replies: 4
    • Views: 3,445
    01-24-2014, 11:55 AM Go to last post
  14. Gambling Theory / Martingale

    Is anyone here familiar with gambling theory? If so, is the Martingale system a viable betting strategy where P(w) > .5, say .5061. Does anyone...

    Started by mchesnu‎, 01-28-2007 09:31 PM
    • Replies: 0
    • Views: 1,951
    01-28-2007, 09:31 PM Go to last post
  15. Statistics question for algorithm development

    Hi, This isn't a homework help question. I'm actually trying to figure out some formulas for algorithm programming. I'm trying to calculate...

    Started by mcmurphy510‎, 08-02-2010 04:33 PM
    • Replies: 0
    • Views: 2,213
    08-02-2010, 04:33 PM Go to last post
  16. Desperate to understand....

    Desperate to understand how to calculate p value for my research on object line degradation, I have tried SPSS, etc, but am getting more and more...

    Started by mcsk‎, 01-15-2013 05:18 AM
    • Replies: 3
    • Views: 1,983
    01-16-2013, 01:05 AM Go to last post
  17. Probability calculation on 2 similar vases with difference in time and backlog

    Hi all, Below is a problem that we find hard to solve, any input would be much appreciated. In short, we're looking for the exact probability...

    Started by McStat‎, 07-21-2016 07:34 AM
    vases time backlog markov
    • Replies: 0
    • Views: 1,813
    07-21-2016, 07:34 AM Go to last post
  18. A couple Normal Distribution Probability problems

    I've been trying to figure out the answer to these two problems for weeks, but I can't seem to figure out how to do them. Please let me know if you...

    Started by meaght12‎, 12-11-2014 02:19 PM
    • Replies: 7
    • Views: 2,136
    12-11-2014, 04:58 PM Go to last post
  19. Looking for help with a question :)

    Hi folks, I'm trying to help a friend with some statistics but since I study engineering it's not something I have covered. If anyone could assist me...

    Started by Mearsy‎, 03-09-2011 05:34 AM
    • Replies: 1
    • Views: 2,653
    03-10-2011, 10:07 AM Go to last post
  20. picking 50 yellow marbles

    If there's a jar with 663 yellow marbles out of 849 total marbles, what is probability that i will extract 50 yellow marbles in 50 tries?

    Started by medc‎, 03-09-2009 10:32 AM
    • Replies: 6
    • Views: 3,306
    03-10-2009, 11:02 AM Go to last post
  21. Second Moments: Convergence in Probability

    Hi, I wish to get feedback as to whether my answer to the following is correct/adequate. Attached for your review. Thanks.

    Started by meeksoup‎, 04-25-2013 07:44 AM
    • Replies: 1
    • Views: 1,806
    04-25-2013, 08:01 AM Go to last post
  22. Geometric and independence

    Hi, New to this forum here. I have attached an interesting question that involves geometric distribution and independence. 3 Questions in all. ...

    Started by meeksoup‎, 03-20-2013 08:21 PM
    • Replies: 6
    • Views: 2,353
    03-23-2013, 12:42 PM Go to last post
  23. coin toss

    I have a coin that lands heads with probability p1; you have a coin that lands heads with probability p2. I toss my coin until I get a head. Each...

    Started by meena‎, 02-23-2012 06:39 AM
    coin toss probability
    • Replies: 8
    • Views: 3,406
    02-26-2012, 05:35 AM Go to last post
  24. Venn Diagram for Random Variables

    Hi All, I was wondering whether it is possible to represent random variables in venn diagrams. As far as I've read, the distribution of...

    Started by meeta‎, 01-17-2012 10:16 PM
    • Replies: 2
    • Views: 2,145
    01-18-2012, 01:03 AM Go to last post
  25. Markov Random Fields

    Hi All, Can anyone kindly refer me to an easily explained tutorial on Markov Random Fields/Markov Networks? Thank you. Meeta

    Started by meeta‎, 01-20-2012 01:33 PM
    • Replies: 0
    • Views: 1,525
    01-20-2012, 01:33 PM Go to last post
  26. Question Probability Question

    Hi, I have two questions that I'm currently struggling with, the first one states that there are 40 red balls, 40 green balls, and 20 blue balls....

    Started by Megan‎, 11-03-2006 07:54 PM
    • Replies: 1
    • Views: 5,040
    11-04-2006, 08:27 AM Go to last post
  27. Success by chance?

    I have a problem where participants had to discriminate two objects, and success was defined was getting 9 correct in a 10 trial run - meaning that...

    Started by meglovestulips‎, 02-21-2008 10:48 AM
    • Replies: 10
    • Views: 3,732
    02-27-2008, 11:27 AM Go to last post
  28. Unhappy uniform distribution

    A manager of a store reports that the time of a customer on the second floor must wait for the elevator has a uniform distribution ranging from 2 to...

    Started by megs915‎, 10-23-2005 06:43 PM
    • Replies: 5
    • Views: 8,245
    10-24-2005, 12:04 PM Go to last post
  29. Unhappy more uniform dist.

    If a is uniformly distributed over (-21,25), what is the probability that the roots of the equation x+ax+a+80=0 are both real? I have no idea what...

    Started by megs915‎, 10-23-2005 06:53 PM
    • Replies: 1
    • Views: 3,966
    10-23-2005, 06:57 PM Go to last post
  30. candy

    A candy store owner has daily demand Y for a certain brand of candy sold from the bulk bins. Suppose the owner will never stock more than one...

    Started by megs915‎, 10-24-2005 12:05 PM
    • Replies: 5
    • Views: 4,641
    10-25-2005, 04:51 PM Go to last post
  31. deciles

    Women's weights are normally distributed with a mean of 143 lb and a standard deviation of 29lb. Find the third decile, D3, which separates the...

    Started by megs915‎, 10-24-2005 12:06 PM
    • Replies: 1
    • Views: 4,719
    10-24-2005, 12:20 PM Go to last post
  32. need help with set-up

    Give the joint density f(x,y)= 60xy^2 if 0<x<y<1 and 0 otherwise, find P(X+Y<1). I just need help setting up the integral...I don't know what to...

    Started by megs915‎, 11-20-2005 01:44 PM
    • Replies: 1
    • Views: 4,346
    11-20-2005, 06:31 PM Go to last post
  33. Raw moments of 3-parameter Weibull distribution

    Hi, I know that the formula for computing the raw moments of 2-parameter Weibull distribution is: Mu'n=b^n*Gamma(1+n/c), where b and c are scale...

    Started by mehdi_m990‎, 08-25-2015 02:46 AM
    moments, weibull
    • Replies: 2
    • Views: 1,224
    08-26-2015, 12:37 AM Go to last post
  34. zero inflated poisson distribution

    I am new and I hope I'm abiding to the rules. I just wanted to know what exactly a zero inflated Poisson distribution is? How is it related to the...

    Started by mekhi‎, 03-16-2010 05:32 AM
    • Replies: 2
    • Views: 6,378
    03-16-2010, 09:21 AM Go to last post
  35. Poisson Distribution

    Here's the question: The number of calls that come into a small mail-order company follows a Poisson distribution. Currently, these calls are...

    Started by melaniemarieg‎, 02-21-2011 08:18 PM
    • Replies: 1
    • Views: 5,385
    02-24-2011, 04:17 AM Go to last post
  36. Confidence interval estimate - distribution binomial, variable when positive

    Hi, Here is my situation: I have a sampling of 60 bills on a population of size 2300. On that sampling, 20 have an error, i.e they have been...

    Started by Meli‎, 11-17-2011 02:12 PM
    tobit; binomial;wald test
    • Replies: 2
    • Views: 2,931
    11-18-2011, 02:07 AM Go to last post
  37. probability question about composing a song

    i have 450 numbers and i want to know which group of numbers have more probability lower of the average or higher and why :i dont know statistics...

    Started by memas‎, 09-01-2011 01:01 PM
    • Replies: 0
    • Views: 1,419
    09-01-2011, 01:01 PM Go to last post
  38. probability

    Can anybody help me to solve this problem ?please :( 1-In a certain community, 50% of the people have disease A, 15% have disease B and 5% have...

    Started by meme‎, 03-18-2006 07:42 AM
    • Replies: 6
    • Views: 4,221
    04-03-2006, 11:06 AM Go to last post
  39. help me

    can any bady help me to solve this problem :confused: Problem 1: An airline finds that 4 percent of the passengers that make reservations on a...

    Started by meme‎, 04-04-2006 03:35 PM
    • Replies: 6
    • Views: 2,712
    12-04-2006, 04:11 PM Go to last post
  40. Cool Care to place a bet? (probability guru needed)

    I consider myself pretty good when it comes to math and probabilities, but this has me stumped. It's your lucky day! A man offers you a fair coin...

    Started by meridian‎, 03-04-2014 01:24 PM
    • Replies: 1
    • Views: 2,085
    03-04-2014, 10:14 PM Go to last post
  41. need help to calculate variance of sales

    Hi, I'm trying to calculate numerical value of the variance of sales, and the probability of a sale greater than 6300 cans. but it seems wrong...

    Started by meriksso‎, 09-19-2011 10:46 PM
    probability question, variance, z-table
    • Replies: 14
    • Views: 6,729
    09-21-2011, 07:18 PM Go to last post
  42. Binomial Distribution Problem

    I'm at work, so I don't have the problem verbatim, but it's something like this: Suppose that companies who launch products with revenue growth as...

    Started by Merlik‎, 10-23-2006 08:49 AM
    • Replies: 0
    • Views: 3,301
    10-23-2006, 08:49 AM Go to last post
  43. Complicated Probability

    Q1. Suppose that four regular 6-sided dice are flipped. 1.What is the probability of a "three-of-a-kind" that is, three of the dice show the same...

    Started by mesha‎, 11-23-2011 12:08 AM
    • Replies: 1
    • Views: 1,792
    11-23-2011, 01:53 AM Go to last post
  44. Probability question -- T Distribution

    You are the head of the Amex card group. Nationally, the credit card default rate is at 12&#37; A random sample of 25 Amex card holders shows a default...

    Started by messanger123434‎, 11-06-2008 06:08 PM
    • Replies: 3
    • Views: 2,637
    11-08-2008, 08:54 AM Go to last post
  45. Somebody please verify the solution i have posted, am not 100% sure

    A telecom produces telephone sets in two plants: New York, and Buffalo. Daily production volumes of a certain model are : 500 and 2000 units...

    Started by messanger123434‎, 11-13-2008 12:39 PM
    • Replies: 1
    • Views: 2,064
    11-13-2008, 04:39 PM Go to last post
  46. simple chi-squared problem

    This is probably a very simple problem Y is distributed by the chi-squared distribution with 5 degrees of freedom. Calculate the probability that...

    Started by messianic‎, 07-12-2010 08:24 PM
    • Replies: 2
    • Views: 2,909
    07-12-2010, 09:00 PM Go to last post
  47. question about binomial distribution

    If the probability distribution of Y is defined by a binomial distribution, what would be the limiting distribution of Y/n as n approaches infinity?...

    Started by messianic‎, 07-13-2010 07:47 PM
    • Replies: 3
    • Views: 4,058
    07-13-2010, 09:26 PM Go to last post
  48. testing hypotheses

    Out of an i.i.d sample, with N = 200, and a sample mean of 7000 and sample variance of 700, how would you answer the following question, At 5%...

    Started by messianic‎, 07-14-2010 01:14 PM
    • Replies: 5
    • Views: 3,278
    07-14-2010, 05:20 PM Go to last post
  49. Binomial Distribution as N goes to Infinity

    I know that the Central Limit Theorem says that all types of distributions go to normal distribution as N goes to infinity. However, is there some...

    Started by messianic‎, 07-15-2010 04:38 PM
    • Replies: 6
    • Views: 9,115
    07-15-2010, 07:36 PM Go to last post
  50. question about likelihood function/MLE

    If a random variable Y has the following probability distribution: P (Y = 1) = p, P (Y = 2) = q, and P (Y = 3) = 1−p−q. A random sample of size n...

    Started by messianic‎, 08-04-2010 09:05 PM
    • Replies: 6
    • Views: 4,509
    08-06-2010, 10:25 AM Go to last post
  51. A bet between a buddy and I regarding the lottery

    Hello all, My coworker is convinced that the Powerball lottery is rigged against those players purchasing more than one game (set of 6 randomly...

    Started by metamologist‎, 09-02-2015 07:48 PM
    • Replies: 8
    • Views: 1,880
    09-08-2015, 11:23 AM Go to last post
  52. Normal distribution probability density function returning values > 1

    i am trying to draw a normal curve over a histogram of some data of mine and i just can't get it to come out right! Mean =1.002327404 Standard...

    Started by method‎, 10-02-2008 11:27 AM
    • Replies: 11
    • Views: 6,356
    10-03-2008, 04:50 PM Go to last post
  53. random variables - expected value of time taken to perform a service

    Hello everyone, My name is Alex, I am from Spain and I need help. I am not trained in statistics and all I know is a little bit from school and...

    Started by Mexikano‎, 07-26-2012 11:16 AM
    • Replies: 5
    • Views: 2,008
    07-31-2012, 01:35 AM Go to last post
  54. 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: 2,204
    10-21-2007, 09:35 AM Go to last post
  55. Unhappy Probability for Zener pyshic card test

    Hi, My Name is Mark Fennell, and I am a flash game developer. (My games are at www.markfennell.com/flash and www.blastone.com) Anyways, my next...

    Started by mfennell‎, 05-19-2008 05:59 PM
    • Replies: 3
    • Views: 8,501
    01-20-2009, 09:01 PM Go to last post
  56. help with a tricky question

    hi guys, when i was looking for statistics exams to practice i found this problem at mit final exam back at 2004 the condition for failure of a...

    Started by MFM‎, 04-21-2014 09:36 AM
    • Replies: 6
    • Views: 1,710
    04-21-2014, 04:52 PM Go to last post
  57. Confidence interval?

    I am trying to create intervals in my data such that each interval contains the same number of samples within its bounds. I created a histogram...

    Started by mfurlend‎, 04-10-2011 11:44 PM
    • Replies: 3
    • Views: 3,888
    05-09-2011, 08:49 PM Go to last post
  58. Joint Probability Distribution

    Can anyone help? The problem: Experiment = {A balance six-sided die is rolled twice} Random Variable X = {the number of 4s obtained in two...

    Started by mgaleai728‎, 10-06-2006 07:16 PM
    • Replies: 3
    • Views: 3,608
    10-08-2006, 09:28 PM Go to last post
  59. Probability! HELP!

    for the fiscal year 2007, a tax authority audited 1.53% of individual tax returns with income of 100,000 or more. What is the probability that two...

    Started by mgonyer‎, 10-19-2009 12:21 PM
    • Replies: 1
    • Views: 2,570
    10-20-2009, 10:47 AM Go to last post
  60. Familywise Type II error rates

    There is a lot in the literature on familywise Type I errror rates but no explanation of familywise Type II error rates. If familywise rates remain...

    Started by mgrant8466‎, 12-09-2010 03:14 PM
    • Replies: 0
    • Views: 2,730
    12-09-2010, 03:14 PM Go to last post

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