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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: 11,268
    09-30-2005, 09:44 AM Go to last post
  1. An event and its complement

    My wife was overdue clearing customs so I thought the probability of her showing up any minute was increasing. But then I thought, suppose -there...

    Started by Outlier‎, Yesterday 08:27 PM
    • Replies: 1
    • Views: 55
    Today, 12:38 AM Go to last post
  2. The Probabiliy of Making it

    I have 1,2,3,4,5,6,7,8,9,10,11,12 teams. Only 8/12 teams make it to the playoffs. What is the probability that 3,4,5,8,9,10 are part of the 8 teams...

    Started by whosphil‎, 10-21-2014 07:21 PM
    combinations, probability
    • Replies: 3
    • Views: 180
    Yesterday, 01:36 AM Go to last post
  3. Question Black Swans, non-normal distributions

    I am looking for a reference to a popular science magazine article. The point of it was that in the real world we find populations that are...

    Started by jcelko‎, 10-19-2014 04:42 PM
    black swan, exponential growth, gaussian
    • Replies: 2
    • Views: 214
    10-22-2014, 08:11 PM Go to last post
  4. Stats homework help NYS

    New York Stock Exchange. Suppose that the percentage returns for a given year for all Stocks listed on the New York Stock Exchange follows a...

    Started by bonfar10‎, 10-22-2014 02:20 PM
    • Replies: 0
    • Views: 109
    10-22-2014, 02:20 PM Go to last post
  5. 600 hotdogs. homework help

    Not quite sure how to do B or C. Thanks for the help! Jake runs the concession stand for a Chicago area minor league baseball team. He knows that...

    Started by Jhawk‎, 10-21-2014 08:56 PM
    • Replies: 0
    • Views: 130
    10-21-2014, 08:56 PM Go to last post
  6. Committee Combination

    Hi. I have used the below formulation of the problem. Kindly let me know whether I am correct or wrong. Q. "A condominium management committee...

    Started by fayyazcivil‎, 10-21-2014 03:20 PM
    probability help, probability homework help, probability question
    • Replies: 0
    • Views: 64
    10-21-2014, 03:20 PM Go to last post
  7. 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: 78
    10-21-2014, 05:36 AM Go to last post
  8. Wink Why this Frequency Polygon is not correct?

    Hi guys! I stumbled upon this blurry question from one of my lab old exams, in statistics elective course. I will leave you to check the...

    Started by modo‎, 10-21-2014 02:40 AM
    frequency polygon
    • Replies: 0
    • Views: 83
    10-21-2014, 02:40 AM Go to last post
  9. Finding Minimum Probability

    Hi. Below is the question in my homework. I don't know whether I've to solve this using Bayes' theorem or I have to provide a general answer. ...

    Started by fayyazcivil‎, 10-20-2014 02:11 PM
    probability help, probability homework help
    • Replies: 0
    • Views: 87
    10-20-2014, 02:11 PM Go to last post
  10. Bayes Probability question

    Question: Yearly automobile inspections are required for residents of the state of Pennsylvania. Suppose that 18% of all inspected cars in...

    Started by 10minmail‎, 10-19-2014 04:57 AM
    • Replies: 0
    • Views: 108
    10-19-2014, 04:57 AM Go to last post
  11. 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: 178
    10-17-2014, 02:26 PM Go to last post
  12. Question Binominal Distribution (urgent)

    kindly help (or provide hints) on below question: Suppose that you pay $1024 to enter a coin tossing game. A biased coin with head probability...

    Started by lkwokchu‎, 10-12-2014 06:11 AM
    • Replies: 5
    • Views: 309
    10-16-2014, 12:48 AM Go to last post
  13. Convergence in Probability

    Hello all. I have a two statements. One says -\frac{1}{T} \sum_{t=1}^T X_t \rightarrow a in probability as T \rightarrow \infty The...

    Started by sacamantecas‎, 10-13-2014 03:42 PM
    • Replies: 2
    • Views: 217
    10-13-2014, 04:10 PM Go to last post
  14. Simple Bernoulli question

    I am sort of baffled by this. The point is to simulate how often students will be right when guessing on a multiple choice tests with 5 responses. It...

    Started by noetsi‎, 10-10-2014 04:54 PM
    • Replies: 13
    • Views: 310
    10-13-2014, 03:24 PM Go to last post
  15. Drwaing the probability distribution of the population from a sample

    Hey there, this might be a bit of an uneducated question, but I want to make sure I don't get anything wrong. I'm wondering if one can draw...

    Started by SWDave‎, 10-13-2014 04:48 AM
    • Replies: 1
    • Views: 198
    10-13-2014, 01:08 PM Go to last post
  16. Please help me start this question.

    Consider an experiment where we roll a single die once and let X represent the number of dots that appear on the top face of the die. Suppose that...

    Started by LH-‎, 10-11-2014 04:06 PM
    dice, probability, unfair
    • Replies: 8
    • Views: 542
    10-12-2014, 11:19 AM Go to last post
  17. Simple but quite confusing Problem

    Hi all, I'm solving the problems in probability but, the question below looks simple but quite confusing to me. Regarding question 2-(c), any...

    Started by sk6398‎, 10-12-2014 03:55 AM
    expected value, probability
    • Replies: 1
    • Views: 151
    10-12-2014, 10:49 AM Go to last post
  18. Negative Binomial Distribution

    Hi, Regards

    Started by aravindavvaru‎, 10-12-2014 08:54 AM
    binomial, geometric distributions
    • Replies: 0
    • Views: 132
    10-12-2014, 08:54 AM Go to last post
  19. Please help me in these questions

    I have these problem can you help me

    Started by nmsm‎, 10-10-2014 12:53 AM
    • Replies: 2
    • Views: 156
    10-10-2014, 03:37 PM Go to last post
  20. Probability theory: The Quantum Measurement Problem

    There is a famous double-slit experiment in Quantum Mechanics that attempted to measure whether electrons and photons are comprised of particles or...

    Started by Michaelamcshane‎, 10-09-2014 10:24 AM
    probability question, quantum measurement, wave interference
    • Replies: 2
    • Views: 201
    10-10-2014, 08:29 AM Go to last post
  21. probability question

    Five cards are dealt at random and without replacement from a standard deck of 52 cards. What is the probability that the hand contains all 4 aces if...

    Started by LIPI‎, 10-09-2014 02:09 PM
    • Replies: 0
    • Views: 135
    10-09-2014, 02:09 PM Go to last post
  22. Difference of expectations of RV's given arbtrary pdfs

    I've been beating my head on this for a while... Let X and Y have pdf's f & g respectively such that \begin{cases} f(x) >= g(x) & \mbox{if } x...

    Started by frito898‎, 10-08-2014 05:23 PM
    • Replies: 1
    • Views: 162
    10-09-2014, 04:23 AM Go to last post
  23. 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: 226
    10-08-2014, 10:14 AM Go to last post
  24. Probability that X restaurants will be visited if Y people choose independently

    I am trying to determine for Y people selecting from X restaurants (with an equal probability) what the expected value of the number of restaurants...

    Started by JPC‎, 10-07-2014 04:53 PM
    expected value, probability help
    • Replies: 2
    • Views: 143
    10-08-2014, 07:37 AM Go to last post
  25. Prob: Normal probability distribution

    The mean cost of domestic airfares in the United States rose to an all-time high of $385 per ticket (Bureau of Transportation Statistics website,...

    Started by kp2‎, 10-07-2014 07:12 PM
    • Replies: 1
    • Views: 640
    10-07-2014, 07:39 PM Go to last post
  26. two normal distributions

    the post no longer relevant - outdated

    Started by random variable‎, 10-06-2014 06:17 PM
    • Replies: 0
    • Views: 190
    10-06-2014, 06:17 PM Go to last post
  27. Expected values K-S test for Normality

    Hi all, I do have a question, given are 12 observed values (see SPSS outprint in attachment) 4,1 4,3 4,6 4,9 5,0 5,1 5,1

    Started by Java‎, 10-01-2014 02:16 PM
    • Replies: 3
    • Views: 262
    10-06-2014, 10:15 AM Go to last post
  28. Need help to prove professor may have altered grades at our university

    We had a class of 15 students who took an exam: test scores were: 56, 65, 65, 54, 28, 65, 55, 47, 68, 41, 71, 86, 65, 67, 65 respectively on a non...

    Started by swamifez‎, 10-04-2014 04:36 PM
    2 Pages
    1 2
    • Replies: 23
    • Views: 738
    10-05-2014, 07:45 PM Go to last post
  29. Lightbulb inverse of the student`s t-distribution

    Hi All, I am trying to use calculate for two-tailed inverse of the student`s t-distribution function presented by Excel functions like...

    Started by andreja‎, 10-03-2014 11:36 AM
    • Replies: 3
    • Views: 183
    10-03-2014, 12:27 PM Go to last post
  30. Mean/Var for Loss rate given Loss and Balance

    We have a variable X (Loss Dollars) with known Mean and Stdev, and variable Y (Balance) with known Mean and Stdev. Letís also assume we know the...

    Started by St210‎, 10-02-2014 09:38 AM
    • Replies: 0
    • Views: 130
    10-02-2014, 09:38 AM Go to last post
  31. Process Control

    Hi, Could anyone help me with a statistical process control problem i have? I am measuring a process which gives a measured value range from 0...

    Started by PresterJohn‎, 09-30-2014 09:28 AM
    • Replies: 7
    • Views: 258
    10-01-2014, 09:34 AM Go to last post
  32. Lightbulb inverse of the student`s t-distribution

    Dear All, I have a issue about two-tailed inverse of the student`s t-distribution. I am trying to use calculation for two-tailed inverse of the...

    Started by andreja‎, 10-01-2014 05:52 AM
    • Replies: 0
    • Views: 114
    10-01-2014, 05:52 AM Go to last post
  33. How to calculate variance of binomial variable where base (n) is binomial also

    Hi I have a survey that collects data from each respondent on gender and also on attitudes. We don't know in advance how many men or women will...

    Started by hughm‎, 10-01-2014 02:46 AM
    binomial distribution
    • Replies: 0
    • Views: 105
    10-01-2014, 02:46 AM Go to last post
  34. Identify Statistically Significant Data Point when Mean/Variance Unknown

    I am conducting a screen of a wide range of compounds and generating measurements for their effect on a protein. We have conducted some work on...

    Started by alexllew‎, 09-30-2014 05:11 AM
    • Replies: 0
    • Views: 133
    09-30-2014, 05:11 AM Go to last post
  35. is the dice average?- theory discussion

    i throw a dice 300times. attahced picture is the result. the question is whether the dice is average? if i do not use any tool, the 5points face is...

    Started by nicegirl‎, 09-27-2014 10:33 PM
    • Replies: 13
    • Views: 418
    09-28-2014, 10:40 PM Go to last post
  36. law of total probability - variation formal names?

    Hello, there are different variations of the law of total probability. For example, the probability of 3 discreet events all occurring is: A1 *...

    Started by random512‎, 09-28-2014 04:59 PM
    • Replies: 0
    • Views: 126
    09-28-2014, 04:59 PM Go to last post
  37. probability density function

    I am having difficulty resolving the two exercises below 1)Consider the function Find the E(X). I now is a Poisson(y), but i don't know how to...

    Started by askazy‎, 09-28-2014 04:00 PM
    • Replies: 0
    • Views: 125
    09-28-2014, 04:00 PM Go to last post
  38. Probability of winning an n-game series

    With the baseball playoffs coming up, I was fiddling around with how to calculate the probability that one team would win a playoff series, given P,...

    Started by Jennifer Murphy‎, 09-28-2014 01:41 AM
    • Replies: 3
    • Views: 235
    09-28-2014, 03:48 PM Go to last post
  39. Baccalaureate Preferences by Gender Question

    I am doing a study on baccalaureate preferences by gender and I have questions about estimating a particular institution's expected male/female...

    Started by Onhech2‎, 09-27-2014 02:12 PM
    • Replies: 0
    • Views: 129
    09-27-2014, 02:12 PM Go to last post
  40. Please Help HW.

    A study undertaken by the Miami-Dade Supervisor of Elections in 2002 revealed that 44% of registered voters are Democrats, 37% are Republicans, and...

    Started by joshbb‎, 09-25-2014 04:19 PM
    • Replies: 2
    • Views: 274
    09-26-2014, 04:20 AM Go to last post
  41. Expected Value & Variance from Z = min (X,Y)

    Dear all, I have an assignment, but I don't understand yet which formulas I have to use to solve it. Here is the question: There is an...

    Started by statjunior‎, 09-24-2014 12:58 AM
    • Replies: 1
    • Views: 243
    09-24-2014, 03:48 AM Go to last post
  42. Need help with geometric pmf

    Hi all, Here's the problem: Let X be the number of accidents per week in a factory. Let the probability mass function of X be f(x) = 1/(x+1) -...

    Started by Dichotomous‎, 09-22-2014 11:34 AM
    • Replies: 2
    • Views: 220
    09-22-2014, 01:26 PM Go to last post
  43. simulating correlated, non-normal data: WHY DOES THIS HAPPEN!?

    i have been experimenting with different methods to generate correlated, non-normal data for comprehensive-exam purposes and i'm finding something i...

    Started by spunky‎, 09-21-2014 04:53 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 493
    09-21-2014, 08:59 PM Go to last post
  44. Comparing proportions

    Hello there: I have a couple of questions about comparing proportions. 1) why do we use a z-test to compare proportions but t-test to compare...

    Started by blue11‎, 09-21-2014 01:35 PM
    • Replies: 0
    • Views: 130
    09-21-2014, 01:35 PM Go to last post
  45. Homework help with conditional probability distribution

    Hi, I was wondering if I could get some help with this homework problem. We are given that X~U(0,1) and conditional distribution of Y|X=x is...

    Started by econnerd‎, 09-16-2014 05:55 PM
    • Replies: 1
    • Views: 257
    09-17-2014, 12:54 AM Go to last post
  46. Astronomer's estimate

    I am trying to solve the problem but end up with no where, Please help me to solve the problem Astronomers estimate that as many as one hundred...

    Started by debaprosad‎, 09-15-2014 11:46 AM
    • Replies: 3
    • Views: 214
    09-16-2014, 03:59 PM Go to last post
  47. Tricky probability problem

    Hi, I was wondering if you could help me out with a problem I have: I need to work out the probability that someone will be able to complete a...

    Started by Probprob‎, 09-15-2014 10:19 AM
    difficult, probability
    • Replies: 1
    • Views: 193
    09-16-2014, 05:24 AM Go to last post
  48. Brain Teaser

    It's here:http://www.braingle.com/palm/teaser.php?id=29228&comm=1 I thought that surely the answer must be 0.5 until I considered writing a test...

    Started by ArtK‎, 09-06-2014 08:47 AM
    • Replies: 11
    • Views: 483
    09-08-2014, 11:43 PM Go to last post
  49. Probability of Unconventional Food Item Alleviating Medical Problem Multiple Times

    For about 2 years, a medical problem has more or less repeated, as follows: The problem normally lasts approximately 3 weeks and then goes away...

    Started by old geezer‎, 09-08-2014 02:50 PM
    correlation, improvement, medical problem, treatment
    • Replies: 0
    • Views: 151
    09-08-2014, 02:50 PM Go to last post
  50. Mathematical intuition for variance

    One explanation to "Why do we square the deviations" is.. "The sum of the square deviations of any set of observations from their mean is the...

    Started by jmlc‎, 09-08-2014 10:41 AM
    variance
    • Replies: 1
    • Views: 123
    09-08-2014, 10:59 AM Go to last post
  51. Help with son's probability question

    Hi Folks, I'm new here. Haven't studied probability in 30 years and trying to help my son with his homework. In the attachments is the question,...

    Started by mackbri‎, 09-04-2014 04:07 PM
    • Replies: 3
    • Views: 264
    09-06-2014, 03:39 AM Go to last post
  52. if z-value is a negative number, how can i calculate the Probability?

    Hello guys, :) I have an important question I want to ask. I have already searched the web and my statistics book but I can not find the answer :(...

    Started by katte‎, 09-04-2014 03:42 PM
    normal distribution, probability, z score, z value, z-value
    • Replies: 2
    • Views: 244
    09-04-2014, 10:14 PM Go to last post
  53. My article on runs testing random bit sequences

    The article is here: http://home.ptd.net/~artnpeg For smaller values of the mean, the Poisson Distribution with cumulative sums is used. For larger...

    Started by ArtK‎, 09-04-2014 05:12 AM
    • Replies: 0
    • Views: 166
    09-04-2014, 05:12 AM Go to last post
  54. probability poisson distributed

    hi can somebody help me with this question please.

    Started by arkeed178‎, 08-29-2014 06:52 AM
    • Replies: 5
    • Views: 574
    09-01-2014, 10:25 AM Go to last post
  55. Non central Chi square distribution and approximations Matlab

    Hello! I have a problem with the computation of a chi squared distribution in Matlab. I have a quadratic form : y' Px y, this form has a non...

    Started by bidou8601‎, 08-29-2014 08:39 AM
    • Replies: 3
    • Views: 268
    08-29-2014, 04:17 PM Go to last post
  56. Traffic light probability question.Need help!!

    Hi, Need help to solve this probability question. At a certain traffic signal red for 30 seconds, yellow for 5 seconds, and green for 25 seconds....

    Started by Shashank Prasad‎, 06-27-2014 04:22 PM
    • Replies: 2
    • Views: 333
    08-29-2014, 11:10 AM Go to last post
  57. Computing probability

    fX(x)= (3/8)*x*x 0<x<2 fY(y)= 1/x x<y<2x P(1<y<3) Now how do i do this ? Do i have...

    Started by studentbelg‎, 08-28-2014 11:47 AM
    • Replies: 1
    • Views: 212
    08-29-2014, 03:47 AM Go to last post
  58. Drawing variates from this density function

    Hi, I have derived the following probability density function, which I would like to draw random variates from as part of a Gibbs sampling step: ...

    Started by graeme‎, 08-21-2014 03:41 PM
    • Replies: 2
    • Views: 192
    08-28-2014, 07:01 PM Go to last post
  59. Poisson proces and binomial

    I'm trying to find the distribution of the number Y of arrivals in the timeinterval \subset where X(t) is number of arrivals in a poissonproces...

    Started by JesperHP‎, 08-28-2014 09:05 AM
    • Replies: 2
    • Views: 144
    08-28-2014, 10:15 AM Go to last post
  60. 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: 323
    08-25-2014, 05:28 PM Go to last post

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