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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: 31,090
    09-30-2005, 09:44 AM Go to last post
  1. Mutual independence -> Conditional independence ?

    hi, all! I have the following question about relations between conditional independence and mutual independence: Does Mutual independence imply...

    Started by -coffee-‎, 05-07-2012 07:39 AM
    • Replies: 1
    • Views: 2,518
    05-07-2012, 09:31 AM Go to last post
  2. Probability involving stock market help pls

    Stock A and stock B. Every day the price of stock A will either increase by 1 dollar with probability 0.6 or decrease by one dollar with...

    Started by -illuzion-b18c1‎, 04-19-2006 04:59 PM
    • Replies: 0
    • Views: 3,741
    04-19-2006, 04:59 PM Go to last post
  3. homework help!

    any1 who can do as much of this as possible!?? 6.Assuming that the following sample of 12 numbers arise from a Normal distribution with mean ...

    Started by 00pickj‎, 04-01-2011 06:55 AM
    • Replies: 1
    • Views: 2,956
    04-01-2011, 09:02 AM Go to last post
  4. Probability problem

    Hello everyone, I don't know how to calculate a probability, relating a lotto game. The problem is: if I choose 10 random numbers in a 6/49 game,...

    Started by 0112358‎, 06-23-2008 09:10 AM
    • Replies: 0
    • Views: 5,527
    06-23-2008, 09:10 AM Go to last post
  5. Thumbs up Which Formula do I Need?

    Hi, I've been scouring the internet for answers but I have very little knowledge when it comes to probability so I need help. I have 10 trials,...

    Started by 0hlie‎, 11-10-2015 08:02 PM
    • Replies: 2
    • Views: 1,555
    11-11-2015, 04:27 AM Go to last post
  6. Probability of queuing

    We are students and we developing the project of a music festival that takes place in 3 venues. We have identified some risks; one of those is...

    Started by 0liver‎, 06-05-2013 12:32 PM
    capacity, probability, queuing, time
    • Replies: 2
    • Views: 1,835
    06-06-2013, 11:31 AM Go to last post
  7. Normal Distribution question

    Can someone help me out with this, Based on a population that is normally distributed, with a population mean of $470 and a population standard...

    Started by 101stats101‎, 11-17-2010 06:41 PM
    • Replies: 2
    • Views: 3,559
    11-17-2010, 08:05 PM Go to last post
  8. Help with some homework

    I got the following question for homework, We know that 27% of the homes in Cleanville have a central vacuum system. We are going to randomly...

    Started by 101stats101‎, 11-20-2010 12:52 PM
    • Replies: 1
    • Views: 1,678
    11-20-2010, 06:53 PM Go to last post
  9. 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: 2,712
    10-19-2014, 04:57 AM Go to last post
  10. selecting randomly from a sample

    Hi, I have a sample of 400 observations. if I want to select randomly 100 out of the 400. could I have 5000 different combinations of the elements...

    Started by 12345678‎, 10-05-2006 11:27 AM
    • Replies: 2
    • Views: 2,468
    10-06-2006, 12:40 AM Go to last post
  11. kurtosis

    Hi, I am calculating the skewness of returns of 10,000 randomly selected portfolios with different portfolio sizes(where assets range from 2 to...

    Started by 12345678‎, 10-27-2006 08:23 PM
    • Replies: 2
    • Views: 5,112
    11-17-2006, 09:47 PM Go to last post
  12. Kurtosis Central limit vs No central limit

    Hi, I am discovering that certain softwares report different measures for kurtosis. Mainly the central limit kurtosis and non central limit...

    Started by 12345678‎, 11-25-2006 11:35 AM
    • Replies: 0
    • Views: 3,206
    11-25-2006, 11:35 AM Go to last post
  13. Game Theory Exercise! Help???

    Consider the following guessing game. There are 100 participants, and each participant announces independently and simultaneously a number between 0...

    Started by 123456789‎, 08-19-2012 03:25 AM
    • Replies: 3
    • Views: 3,730
    08-24-2012, 04:50 PM Go to last post
  14. Statistical significance for discrete data?

    I'm getting myself in a muddle and hoping someone can help! I am analysing a discrete data set - I am comparing my control and experimental group,...

    Started by 1982lu‎, 08-09-2008 09:28 AM
    • Replies: 0
    • Views: 2,569
    08-09-2008, 09:28 AM Go to last post
  15. Markov chain

    hi I'm struggling with this question: (Genetics) Two animals are mated. From their offspring, two are selected and they are mated...

    Started by 1cookie‎, 03-15-2008 11:41 AM
    • Replies: 0
    • Views: 3,333
    03-15-2008, 11:41 AM Go to last post
  16. Computing pobabilities for any normal probability Dist.

    Greetings all, I am a math challenged individual in the middle of a stats class and (you've heard it before) seriously struggling with story...

    Started by 1Moretime‎, 10-14-2012 11:23 AM
    • Replies: 2
    • Views: 4,971
    10-14-2012, 03:23 PM Go to last post
  17. Probability: 10 true/false questions, probability at least 7 are correct

    An instructor gives a quiz involving 10 true-questions. To test the hypothesis that he student is guessing, the following rule is adopted: a) If 7...

    Started by 1nvictus‎, 04-25-2013 01:52 AM
    • Replies: 1
    • Views: 3,183
    04-25-2013, 02:07 AM Go to last post
  18. Expected Value calculation

    I have 2 random variables U and V uniformly distributed on . Their joint cumulative distribution function F(u, v) = min (u,v) on x . Therefore I...

    Started by 1stone‎, 03-30-2011 08:48 AM
    • Replies: 9
    • Views: 4,105
    06-07-2011, 04:17 PM Go to last post
  19. Equation involving uniformly distributed variable

    Let U be a random variable uniformly distributed on , and let X be a dependent variable such that X^U = a for some number a (X^U means X to the power...

    Started by 1stone‎, 03-30-2011 08:30 PM
    • Replies: 5
    • Views: 3,170
    03-31-2011, 02:29 PM Go to last post
  20. Using Taylor expansion for calculating Expected Value

    Hello, This question is motivated by a very helpful approach suggested by BGM for solving an expected value estimation problem recently posted on...

    Started by 1stone‎, 04-04-2011 01:10 PM
    • Replies: 1
    • Views: 11,456
    04-04-2011, 02:15 PM Go to last post
  21. "Bridging" uniform and "mass" distributions

    My goal is to find a family X(a, b) of random variables (continuously) depending on two non-negative parameters a and b . The family should have the...

    Started by 1stone‎, 04-26-2011 10:18 AM
    • Replies: 2
    • Views: 2,293
    04-26-2011, 11:22 AM Go to last post
  22. Probability Distribution Function

    Hi Every one. Can any one help me to start solving this problem?i am stocked in the beginning. The range of a ballistic projectile is given by ...

    Started by 22nelson‎, 03-13-2012 09:44 PM
    pdf cdf
    • Replies: 6
    • Views: 2,202
    03-15-2012, 03:49 AM Go to last post
  23. Lightbulb Quick Population / Media Prob question

    This is hopefully a fairly quick conditional probability question for you guys. Imagine a total population of 22MM people and I am running a...

    Started by 2biggie‎, 01-10-2016 12:47 PM
    media mix, probability, sample, survey analysis
    • Replies: 0
    • Views: 1,213
    01-10-2016, 12:47 PM Go to last post
  24. Probability Distributions

    Hi, I understand all the fuss about normal distribution. a lot of real life events and their probability of occurence follow a normal...

    Started by 30percent‎, 01-11-2013 08:16 PM
    • Replies: 3
    • Views: 1,766
    02-06-2013, 12:36 PM Go to last post
  25. Poisson

    I just took an exam and not sure if I botched up on the Poisson concept which was asked several times. Possion (e^-lambda*lambda^X/X!) .5...

    Started by 3af3afr‎, 10-12-2006 05:55 PM
    • Replies: 1
    • Views: 2,498
    10-19-2006, 06:57 AM Go to last post
  26. 4th Super Bowl Victory

    When the NY Giants won Super Bowl XLII it was their 3rd Super Bowl victory AND it was also the third time that I created a NY Giants billboard in...

    Started by 3for3‎, 03-05-2008 02:06 PM
    • Replies: 0
    • Views: 2,416
    03-05-2008, 02:06 PM Go to last post
  27. Payoff table probabilities

    Hello guys, I have an assignment and I am royally stuck and don't have a clue how to begin. Any sort of help would be greatly appreciated (no need to...

    Started by 441631‎, 01-31-2014 09:09 PM
    • Replies: 0
    • Views: 2,571
    01-31-2014, 09:09 PM Go to last post
  28. Simple Problem

    In a game, you: - Win 70 in scenario 1 - Win 4 in scenario 2 - Lose 20 in scenario3 - Lose 80 in scenario 4 For it to be a fair game, what...

    Started by 5feira‎, 05-19-2017 11:14 PM
    • Replies: 1
    • Views: 1,070
    05-20-2017, 04:20 AM Go to last post
  29. need help with statistics

    1. The problem statement, all variables and given/known data the weight of items produced by a production line is normally distributed with a mean...

    Started by 619snake‎, 08-13-2010 02:07 PM
    • Replies: 2
    • Views: 3,190
    08-13-2010, 03:19 PM Go to last post
  30. probability, independent or dependent

    Hello. I roll a dice twice. Let's say that A = odd number on first, B = even number on second, C = sum is odd. Now, I need to calculate P(A),...

    Started by 8Julio‎, 10-08-2011 02:11 AM
    • Replies: 7
    • Views: 3,330
    10-10-2011, 09:56 AM Go to last post
  31. Three shooters, probability that two of them hits

    I have a little problem. There are three shooters ( i= 1,2,3) and they hit the target with probabilities P(A1) = 1/2, P(B1) = 2/3, P(A3) = 3/4....

    Started by 8Julio‎, 10-20-2011 01:26 PM
    • Replies: 14
    • Views: 5,485
    10-24-2011, 01:18 AM Go to last post
  32. What type of sampling is this....`

    First of all sorry if this is in the wrong section but i think is the section that applies most! I want to distrubute questionaires to five groups...

    Started by 98107‎, 03-04-2011 03:35 PM
    • Replies: 5
    • Views: 3,014
    03-08-2011, 11:23 PM Go to last post
  33. summing two probability density functions---Gompertz hazard model?

    Hi, r-help members. I have a question about summing two density distributions. I have two samples from which I've estimated hazard parameters for...

    Started by @nthRo‎, 04-23-2012 04:44 PM
    density function, gompertz, hazard model, probability function
    • Replies: 0
    • Views: 3,393
    04-23-2012, 04:44 PM Go to last post
  34. Question Fitting distribution to dependent bivariate dataset

    Hello, We have a dataset that consists of two variables, X and Y (see attached Excel file) that have some dependence. For a given X we can...

    Started by a9192shark‎, 11-05-2009 08:32 AM
    • Replies: 0
    • Views: 2,939
    11-05-2009, 08:32 AM Go to last post
  35. 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: 1,721
    11-10-2012, 05:59 PM Go to last post
  36. The Old Coin Toss Question

    Helppppp meeee! AH. :wave: John flips a fair, two-sided coin 5 times. a. What is the probability that he flips 4 heads? ...

    Started by aab11786‎, 02-06-2011 07:25 PM
    • Replies: 2
    • Views: 3,553
    02-23-2011, 06:18 AM Go to last post
  37. Probability Proportion Question

    Hello I am having a bit of difficulty understanding how to go about this question. A very large airline claims that 90% of their flight departures...

    Started by aaron7058‎, 12-17-2013 04:07 PM
    • Replies: 1
    • Views: 1,687
    12-18-2013, 12:22 AM Go to last post
  38. Wink Propability with variable

    Hi , I need help with my statistics homework. I'm not realy good at statistics :shakehead more green. So will be very great to get some help.;)

    Started by Aauusteja‎, 11-02-2010 03:59 PM
    • Replies: 5
    • Views: 2,876
    11-03-2010, 03:09 PM Go to last post
  39. How to get this number?

    a) Variant P(x=0)=P(0,0)+P(0,1)+P(0,2)=0.27 P(x=1)=P(1,0)+P(1,1)+P(1,2)=0,4 P(x=2)=P(2,0)+P(2,1)+P(2,2)=0.33 expected value ( I do not know how...

    Started by Aauusteja‎, 11-22-2010 10:51 AM
    • Replies: 13
    • Views: 3,777
    11-24-2010, 12:16 PM Go to last post
  40. Probability question

    I need a probability question answering as soon as possible and i though this might be the place to come. There are 13 balls in a hat being...

    Started by ab1234‎, 03-02-2014 07:33 PM
    hypergeometric, urn
    • Replies: 5
    • Views: 2,035
    03-02-2014, 11:36 PM Go to last post
  41. Probability of Word within Word

    Hello! I'm in dire need of help as I've been working on this for a couple days now. I've been to the help center around school and have had three...

    Started by Abbott54‎, 04-16-2008 11:20 AM
    • Replies: 2
    • Views: 4,828
    04-16-2008, 11:04 PM Go to last post
  42. Bayes' Theorem

    Hi guys, I was hoping somebody might be able to help me with this question. The information I am given: Gamma1 = the risk of disease for...

    Started by abc123‎, 03-20-2008 07:34 AM
    • Replies: 0
    • Views: 2,836
    03-20-2008, 07:34 AM Go to last post
  43. Please Help~~~

    Let say if player A scores an average of 3 points per game, and he has played a tons of games already. What fraction of his games will be exactly...

    Started by abcboy‎, 10-05-2006 10:03 PM
    • Replies: 3
    • Views: 2,588
    10-09-2006, 10:13 AM Go to last post
  44. Probablity Question!! HELP PLEASE~~

    Suppose that (X, Y) is uniformly distributed over the region defined by 0<y<1-x^2 and -1<x<1, find the joint density.

    Started by abcboy‎, 10-10-2006 08:32 PM
    • Replies: 1
    • Views: 2,634
    10-10-2006, 11:41 PM Go to last post
  45. Please Help~~

    ignore this, I have solved the problem

    Started by abcboy‎, 11-17-2006 06:52 AM
    • Replies: 1
    • Views: 2,315
    11-21-2006, 12:41 AM Go to last post
  46. Birthday problem

    ignore this, I have solved the problem

    Started by abcboy‎, 11-25-2006 12:52 AM
    • Replies: 0
    • Views: 2,608
    11-25-2006, 12:52 AM Go to last post
  47. household selection probabilities for household surveys

    Hi, we are starting a survey with 2 stage cluster sampling approach. At first stage we select a fixed number of clusters from total population...

    Started by abeshkc‎, 06-04-2010 01:07 AM
    • Replies: 0
    • Views: 3,798
    06-04-2010, 01:07 AM Go to last post
  48. probability

    Hi My name is Angela. Can anyone help me figure out how to do this problem. I don't know where to begin. An automobile has three factories. A, B,...

    Started by abrock2‎, 06-04-2008 08:05 PM
    • Replies: 1
    • Views: 2,539
    06-05-2008, 11:49 PM Go to last post
  49. Help please.... Find the expectation of the game

    Hi my name is Angela. Can anyone help me with this problem please..... For $4 a person may buy a chance at a raffle. There are 2000 tickets sold....

    Started by abrock2‎, 06-05-2008 03:53 PM
    • Replies: 1
    • Views: 2,605
    06-05-2008, 11:59 PM Go to last post
  50. Point me in the right direction on a game probability

    This is my third time typing this grrrr. Let's hope my login holds this time. I have written a dice game for the computer and now I am trying to...

    Started by Absinthe‎, 05-26-2012 08:21 PM
    • Replies: 3
    • Views: 2,049
    06-30-2012, 07:52 PM Go to last post
  51. Permutations involving additional chances

    I am attempting to calculate the probabilities of a simple dice game. I have actually calculated the perfect score, and the additional permutations...

    Started by Absinthe‎, 07-08-2012 06:44 PM
    • Replies: 6
    • Views: 2,941
    01-13-2014, 09:44 AM Go to last post
  52. Central Limit Theory?

    Hi everyone! Here's my problem: In a large population, 12.5% of all individuals have diabetes. (a) Seven of these individuals are sampled at...

    Started by abyss‎, 11-28-2005 07:44 PM
    • Replies: 7
    • Views: 4,044
    11-28-2005, 11:35 PM Go to last post
  53. Employee commuting question

    It takes an average weekday commute of 39 minutes with a Standard Deviation of 7 minutes for the employees to get to work when they use their...

    Started by acalm‎, 12-22-2015 10:20 AM
    • Replies: 1
    • Views: 1,728
    12-22-2015, 10:35 AM Go to last post
  54. Null and alternate hypothesis

    Hi- I have a problem that begins, "Suppose you wish to test the null hypthesis that u=50 vs the alternate hypothesis that u<50...."and then it goes...

    Started by acarnle1‎, 10-15-2008 08:48 PM
    • Replies: 1
    • Views: 2,954
    10-15-2008, 09:49 PM Go to last post
  55. Cool true hypothesis and errors??

    Ok...so i have a sample problem that asks to describe the circumstances under which a researcher would make a Type I and or Type II error in the...

    Started by acarnle1‎, 10-18-2008 04:20 PM
    • Replies: 2
    • Views: 1,681
    10-19-2008, 07:26 AM Go to last post
  56. one or two tailed?

    Ok, so i know when testing to determine if say a drug umproves some fuction, the null and alternate hypothesis would not be two tailed. But, if im...

    Started by acarnle1‎, 10-26-2008 09:29 AM
    • Replies: 1
    • Views: 2,750
    10-26-2008, 10:43 AM Go to last post
  57. Game Probability

    Hi All - I have not looked at statistics or probability for a number of years but am wondering if someone can provide me with a formula for figuring...

    Started by acas‎, 07-14-2010 08:58 AM
    • Replies: 4
    • Views: 4,382
    07-14-2010, 12:26 PM Go to last post
  58. Exponential likelihood ratio test help

    Hello all, I am trying to get a grasp of likelihood ratio tests. Can any one help me with the following problem? Exponential likelihood ratio...

    Started by acasas44‎, 04-22-2012 02:38 PM
    • Replies: 1
    • Views: 3,072
    04-22-2012, 03:12 PM Go to last post
  59. A probability question

    Dear all This may be simple for you guys but I would be grateful for some advice on the following: A bus stop layby is only long enough for 2...

    Started by acevialli‎, 04-08-2014 09:44 AM
    • Replies: 5
    • Views: 1,642
    04-09-2014, 07:50 AM Go to last post
  60. one question

    well, I did post this in another forum, but I just realized I probably should have posted it here. I've just been having trouble with this one...

    Started by AcidicBassist‎, 04-04-2006 08:39 AM
    • Replies: 1
    • Views: 2,571
    04-04-2006, 02:24 PM Go to last post

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