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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 10:44 AM
    • Replies: 0
    • Views: 11,942
    09-30-2005, 10:44 AM Go to last post
  1. Game probability query

    I'm trying to develop a game idea - a kind of passport bingo. 200 people each have passports. Each passport has a 9 digit number. If I read out a...

    Started by davidehc‎, Yesterday 07:05 AM
    • Replies: 0
    • Views: 50
    Yesterday, 07:05 AM Go to last post
  2. Question Poisson Distribution with two different expected value

    Question: Suppose there are number of accidents at location A and location B each day with Poisson Distribution with rate 0.001 and the number of...

    Started by Asano‎, 02-25-2015 12:03 PM
    mixed distribution, poisson distribution, probability, statistics
    • Replies: 2
    • Views: 140
    02-26-2015, 07:38 AM Go to last post
  3. Second Order Stochastic Dominance

    how can I test for second order stochastic dominance? is easy to understand the idea but when I have to normal distributions with different means and...

    Started by santicanel‎, 02-25-2013 09:02 PM
    • Replies: 2
    • Views: 845
    02-25-2015, 03:42 PM Go to last post
  4. Question Mixed Poisson Distribution Help

    Question: The number of accidents follows a Poisson distribution with mean 12. Each accident generates 1, 2 or 3 claimants with probabilities...

    Started by Asano‎, 02-25-2015 11:56 AM
    actuarial, homework help, probability, statistics
    • Replies: 1
    • Views: 84
    02-25-2015, 02:12 PM Go to last post
  5. Statistics HEEELLPPP!!

    A lot of 1000 components contains 250 that are defective. Two components are drawn at random and tested. Let A be the event that the first component...

    Started by Kcgiggles‎, 02-24-2015 10:02 PM
    • Replies: 1
    • Views: 134
    02-24-2015, 11:14 PM Go to last post
  6. Question Symbol for Mean of Probability Distribution

    “mu” is the symbol for the mean of a population, “x-bar” is the symbol for the mean of a sample, and “mu of x-bar” is the symbol for the mean of the...

    Started by DrAnthonyRodriguez‎, 02-24-2015 10:10 AM
    • Replies: 1
    • Views: 91
    02-24-2015, 11:48 AM Go to last post
  7. Help! HW: Family with 6 children, gender and birth

    Problem 2.1.5 from Basic Concepts of Probability and Statistics, 2nd Ed. by Hodges and Lehmann Suppose you know that a family has 6 children, 2...

    Started by yl2j‎, 02-22-2015 02:32 PM
    • Replies: 0
    • Views: 127
    02-22-2015, 02:32 PM Go to last post
  8. Trying to handicap the outcome of a race based on given probabilities

    Hello everyone. The past year or so I've been generating projection models for various sports to predict the performance of individual players....

    Started by huitcinq‎, 02-20-2015 05:22 PM
    distribution probability, probabilities, sports
    • Replies: 0
    • Views: 138
    02-20-2015, 05:22 PM Go to last post
  9. Distribution of β hat sigma hat

    This is my problem: Find the distributions of β-hat and σ2-hat for Yi = βxi + εi Is this prove sounds right?

    Started by aytajalli‎, 02-20-2015 12:50 PM
    • Replies: 1
    • Views: 156
    02-20-2015, 01:04 PM Go to last post
  10. Normal Distribution times constant

    I can't seem to find anything about this on the web. If I have a random variable distributed Normally: x ~ Normal(mean,variance) is the...

    Started by BigBugBuzzz‎, 09-30-2012 10:45 AM
    normal distribution
    • Replies: 4
    • Views: 9,863
    02-18-2015, 09:45 PM Go to last post
  11. Question Questions about the CLT

    The Central Limit Theorem (CLT) involves taking repeated samples of size n from a population. That is, the process involves two things: the number...

    Started by DrAnthonyRodriguez‎, 02-18-2015 10:20 AM
    clt
    • Replies: 1
    • Views: 146
    02-18-2015, 11:11 AM Go to last post
  12. D&D GM Needs Help Calculating Stat-Upgrades

    Hello! I've never taken a stat class, so bear with me if this seems basic. I have searched for a while for a solution to this, but nothing has been...

    Started by Marshmeloo‎, 02-17-2015 05:43 AM
    • Replies: 3
    • Views: 229
    02-18-2015, 12:45 AM Go to last post
  13. [ASK] Combination: Am I Doing This Right?

    Among 10 candidates of Students Council members, 3 people will be selected to undergo training. The number of possible ways to do so if 1 candidate...

    Started by Monox D. I-Fly‎, 02-14-2015 02:01 AM
    • Replies: 2
    • Views: 152
    02-17-2015, 10:06 PM Go to last post
  14. Unhappy Probability Question - Express in terms of P

    Hi, I am currently stuck on a probabilities question and I was wondering if anyone could help me a bit. A and B are two events. Suppose that ...

    Started by Bill_McCoy‎, 02-16-2015 08:07 AM
    express in terms of p, independent, probabilities
    • Replies: 1
    • Views: 137
    02-17-2015, 04:51 PM Go to last post
  15. Probablility question

    If the odds of winning a game are 1 in 10 what are the odds of winning that game three times in a row? Thanks for your help!

    Started by amynkaya@yahoo.com‎, 02-16-2015 12:45 PM
    • Replies: 0
    • Views: 116
    02-16-2015, 12:45 PM Go to last post
  16. Probability question

    For the 1st part of the question do I use Baye's Theorem? e.g. Required probability = 0.25*0.35/= 0.30 - using Baye's Theorem And can anyone...

    Started by tvtokyo‎, 02-16-2015 07:56 AM
    probability
    • Replies: 0
    • Views: 142
    02-16-2015, 07:56 AM Go to last post
  17. Basketball shooting percentage - binomial distribution?

    I am interested in studying the probability of team field goal percentage being unusually high. In context, I recently watched a women's college...

    Started by DRMORRIS‎, 02-14-2015 01:59 PM
    • Replies: 3
    • Views: 195
    02-15-2015, 11:59 AM Go to last post
  18. Negativ Binomial distribution

    I am trying to count number of occurrence for variable X. I have considered X as Poisson distributed since this sounds like a Poisson process. But...

    Started by Alfa‎, 02-14-2015 02:57 AM
    • Replies: 2
    • Views: 171
    02-15-2015, 06:15 AM Go to last post
  19. Question Type of Discrete Distribution

    What type of discrete probability distribution is the probabilities of the sum of the outcomes of an infinite number of dice rolls? The probabilities...

    Started by DrAnthonyRodriguez‎, 02-14-2015 05:59 PM
    probability distributions
    • Replies: 2
    • Views: 156
    02-15-2015, 06:05 AM Go to last post
  20. difference of two independent Poisson random variables

    Why the difference of two independent Poisson random variables doesn't have Poisson distribution? Demonstrate it.

    Started by LIPI‎, 02-10-2015 07:57 PM
    • Replies: 6
    • Views: 177
    02-13-2015, 11:50 AM Go to last post
  21. Bernoulli distribution and PGF

    let Yi,j be independent Bernoulli random variables with E = 1/j. Let Zj = sumYi,j for i=1 to j . Let MZj(s) be the probability generating function...

    Started by aytajalli‎, 02-10-2015 06:11 PM
    • Replies: 6
    • Views: 240
    02-12-2015, 01:37 PM Go to last post
  22. Exponential Distribution with uniform random variables

    I choose Θ according to the exponential distribution with mean 1. I then choose 10 i.i.d. random variables X1, . . . , X10, where each Xi has...

    Started by aytajalli‎, 02-11-2015 03:11 PM
    • Replies: 2
    • Views: 138
    02-11-2015, 11:42 PM Go to last post
  23. Combinations question

    I have a strange question I hope someone can explain it to me or tell me if there is some type of statistical definition for this process im trying...

    Started by ilikepeas‎, 02-10-2015 12:29 AM
    • Replies: 6
    • Views: 213
    02-10-2015, 10:09 PM Go to last post
  24. Error in Mosteller book? Problem 37

    I have been reading this book since I was 13. Time to time I open it and solve one or two problems (if I can). Especially I like problem #37 about a...

    Started by vasyok‎, 02-08-2015 08:48 PM
    • Replies: 4
    • Views: 216
    02-09-2015, 05:14 PM Go to last post
  25. Probability of Sporting Event Occurring

    Hello everyone I am trying to establish whether it is possible (or appropriate) to calculate the probability of a sporting event occurring given...

    Started by Regal88‎, 02-09-2015 02:29 PM
    bayes thoerem, football, outcomes, probability, soccer
    • Replies: 0
    • Views: 144
    02-09-2015, 02:29 PM Go to last post
  26. Var(X+Y+Z)

    What is the formula for the variance of 3 dependent variables? For 2 dependent variables, the formula is Var(X)+Var(Y)+2*Cov(X,Y) What is...

    Started by shrek‎, 07-08-2008 03:20 PM
    • Replies: 6
    • Views: 31,997
    02-09-2015, 02:15 AM Go to last post
  27. I need a lot of help!

    Hi guys. I have some questions and I will really appreciate your help! <3 1. (c) “Whenever possible, open-ended classes should be avoided.”...

    Started by plaide‎, 02-08-2015 01:47 AM
    • Replies: 0
    • Views: 180
    02-08-2015, 01:47 AM Go to last post
  28. Combinatorial Analysis HW Help

    There are 100 U.S Senators, two from each of the 50 States. If 12 Senators are randomly chosen to form a committee, what is the probabilty that...

    Started by blackhaze5‎, 02-08-2015 12:36 AM
    combinations, combinatorics, probability
    • Replies: 0
    • Views: 102
    02-08-2015, 12:36 AM Go to last post
  29. Golf Scores

    Yesterday my buddy and I both shot 84, 12 over par. But although we had the same gross scores we noticed that we did not tie any single hole. ...

    Started by Jonart‎, 02-07-2015 11:46 AM
    • Replies: 0
    • Views: 140
    02-07-2015, 11:46 AM Go to last post
  30. Probability

    A hiker is lost in a cave, and he wants to get out of the cave. Three passages are open to her. The first passage leads to the outside after 1 hour...

    Started by random_J‎, 02-06-2015 02:30 AM
    • Replies: 3
    • Views: 176
    02-06-2015, 01:06 PM Go to last post
  31. I need your help!

    (a) Bottle 1 consists of 4 red balls and 6 blue balls. Bottle 2 consists of some unknown number of red balls and 12 blue balls. One ball is drawn...

    Started by plaide‎, 02-06-2015 07:52 AM
    • Replies: 1
    • Views: 130
    02-06-2015, 08:11 AM Go to last post
  32. Question Stuck with a (i think) simple problem

    Hi everybody, I have a question here that I'm completely brain frozen with.. (I'm not the youngest anymore, and I can't seem to wrap my brain around...

    Started by derBrain‎, 02-04-2015 04:31 PM
    • Replies: 5
    • Views: 250
    02-05-2015, 01:39 PM Go to last post
  33. Probability of Failure of components...

    Hi there, My question is pretty simple, but I think I am going about the wrong way. An aircraft part has a .40 probability of being...

    Started by ChinookDriver47‎, 02-04-2015 09:21 PM
    • Replies: 1
    • Views: 143
    02-05-2015, 12:40 AM Go to last post
  34. Question Calculating Sensitivity and Specificity of Combined Testing...With a Surprise.

    Ok guys. I have an interesting question. I'm a biomedical engineering student from Georgia Tech and for one of my classes I have to implement...

    Started by ErikSampayo‎, 01-27-2015 01:49 PM
    conditional testing, rescreening, screening, sensitivity, specificity
    • Replies: 5
    • Views: 344
    02-03-2015, 09:35 AM Go to last post
  35. Problem regarding expectation, cdf

    There are two random variables X1, X2 that are iid and continuous. Their cdf is F(x)= P(Xi<x). Show P(X1<X2) = E(F(X1)) Show that E(F(X1)) = 1/2....

    Started by icecream12345‎, 02-01-2015 02:09 AM
    • Replies: 3
    • Views: 171
    02-01-2015, 03:16 PM Go to last post
  36. Simple Probability

    Years since I have done stats, just want to check I have done this correct: If amazon use 3 companies to deliver parcels, Royal Mail, City Link,...

    Started by calypso‎, 02-01-2015 12:56 PM
    • Replies: 2
    • Views: 123
    02-01-2015, 01:59 PM Go to last post
  37. Simple probablility question. Been years since I have studied this stuff.

    I am writing a script that is sort of like a slot machine. Here is how it works random numbers are chosen that are between 0-9 This is done 4...

    Started by mrdobalina‎, 02-01-2015 01:42 AM
    • Replies: 1
    • Views: 143
    02-01-2015, 09:34 AM Go to last post
  38. MGF, Moment-Generating Function

    Let X1 and X2 be two independent random variables. Let X1 and Y = X1 + X2 be χ2(r1) (Chi Square) and χ2(r), respectively, where r1 < r. (a) Find...

    Started by aytajalli‎, 01-29-2015 11:50 PM
    chi square, mgf
    • Replies: 4
    • Views: 286
    01-31-2015, 04:58 PM Go to last post
  39. Acceptance Testing - Calculating Type 1 and Type 2 Errors

    Removed...

    Started by bluejay‎, 01-27-2015 01:51 AM
    • Replies: 1
    • Views: 326
    01-27-2015, 11:25 AM Go to last post
  40. When are you using: Bayes or discriteet or norminal

    WHEN ARE YOU USING: BAYES OR DISCRITEET (BIO) OR NORMINAL (CONTINU) PROPABILITY? THE FORMULES ARE WRITTEN IN MY TEXTBOOK and i understand the...

    Started by ozkan‎, 01-25-2015 06:55 PM
    • Replies: 0
    • Views: 135
    01-25-2015, 06:55 PM Go to last post
  41. Probability of unavailability and one more question please help to me.

    Hi all helpful people :) Please answer that , I didn't think about it . My knowledge not enough for this question. 4. In a certain company, the...

    Started by gkhn_06‎, 01-24-2015 12:05 PM
    • Replies: 0
    • Views: 198
    01-24-2015, 12:05 PM Go to last post
  42. Conditional probability of an event given two independent events

    I am dealing with an interesting probability problem. I had 16 subjects randomly divided into 4 different rooms, each room having 4 seats. The...

    Started by Blain Waan‎, 01-19-2015 11:17 AM
    probability, probability help, probability question
    • Replies: 2
    • Views: 275
    01-20-2015, 08:14 AM Go to last post
  43. Joint Probability Distribution from Drawing 5 Cards

    Consider drawing 5 cards from a standard poker deck without replacement. I am attempting to construct a joint probability distribution table for 2...

    Started by wyngarth‎, 01-03-2015 03:40 PM
    • Replies: 8
    • Views: 494
    01-17-2015, 12:58 PM Go to last post
  44. Expected utility of portfolio problem

    Can someone show that the problem of maximizing 2.1 is equivalent to the problem of maximizing 2.2. Step by step description please. See the attached...

    Started by Stats2‎, 01-16-2015 03:32 PM
    • Replies: 0
    • Views: 145
    01-16-2015, 03:32 PM Go to last post
  45. Question Multiple Events and Cumulative Probability Calculation(s)

    Hi! I don't know statistics, hopefully someone will kindly help me. I'd like to learn how to calculate the probability of an event happening Y...

    Started by Nalgarryn‎, 01-13-2015 03:16 PM
    independent events, iterated probability, multiple events
    • Replies: 1
    • Views: 238
    01-13-2015, 03:22 PM Go to last post
  46. Probability in online casino slot machines: Dilemma

    Hi there, I am new here, but I have come as I am interested to see what people make of this. I am part of an online community that collectively...

    Started by packtim‎, 01-13-2015 08:38 AM
    • Replies: 3
    • Views: 232
    01-13-2015, 03:07 PM Go to last post
  47. [ASK] Doctrine of Chances by Abraham de Moivre

    Doctrine of Chance is a book published by Abraham de Moivre in 1718. It was on the sbuject of probability containing many innovations such as method...

    Started by Monox D. I-Fly‎, 01-09-2015 10:29 PM
    • Replies: 0
    • Views: 479
    01-09-2015, 10:29 PM Go to last post
  48. Standard deviation

    Hello To solve the exercise below, I need the standard deviation =σ I have no clue to get it out of the values below: A researcher wants to know...

    Started by roger20‎, 01-09-2015 01:17 PM
    • Replies: 3
    • Views: 224
    01-09-2015, 01:38 PM Go to last post
  49. Request for help in probability question.

    There are 50,000 applicants out of which, 20,000 applicants needs to be picked. 1. What is the probability that an applicant say "Joel" is...

    Started by Johnutsa1‎, 01-08-2015 04:08 PM
    • Replies: 0
    • Views: 197
    01-08-2015, 04:08 PM Go to last post
  50. Request for help on probability.

    Hi All, I need your help to solve this question. I am preparing for exam and trying to solve this question. A ball is selected from a box...

    Started by anna1999‎, 01-07-2015 03:37 PM
    • Replies: 1
    • Views: 208
    01-07-2015, 03:47 PM Go to last post
  51. Reversing the moment generating function

    So this is my moment generating function \frac{e^{-2t}+e^{-t}+e^{t}+e^{2t}}{4} Now i need to find the PDF or CDF So i think the moment...

    Started by studentbelg‎, 01-06-2015 02:29 PM
    • Replies: 1
    • Views: 232
    01-06-2015, 05:24 PM Go to last post
  52. Computing MLE estimate

    So I have so i'm stuck at taking the log :mad: can somoene help me ?

    Started by studentbelg‎, 12-01-2014 03:33 PM
    • Replies: 5
    • Views: 555
    01-06-2015, 01:17 PM Go to last post
  53. Conditional normal implying independence

    So reading a book someone comment that e \lvert x \sim N(0,1) hence e is independent of x. Why is this the case? Trying to prove this to myself...

    Started by JesperHP‎, 01-03-2015 12:59 PM
    • Replies: 1
    • Views: 247
    01-06-2015, 05:19 AM Go to last post
  54. Expected value and variance of profit

    Hello all, I have this question, which I think I partially knows how to solve, but need some completion. "A man is playing versus a machine in the...

    Started by Yankel‎, 01-06-2015 02:43 AM
    • Replies: 1
    • Views: 224
    01-06-2015, 04:53 AM Go to last post
  55. P-value from test statistic

    I'm given a test-statistic of 2.4 in one of those H0 type problem with a 0.05 significance level. In the z-table, if you look up 2.4, it says 0.0082....

    Started by robbiesqp‎, 12-11-2009 07:02 PM
    • Replies: 8
    • Views: 16,735
    01-01-2015, 10:33 PM Go to last post
  56. An engineer has observed that the gap times between...

    I am struggling with this question ..please help An engineer has observed that the gap times between vehicles passing a certain point on a...

    Started by Jeff Hardy‎, 12-31-2014 11:19 AM
    • Replies: 2
    • Views: 316
    12-31-2014, 04:23 PM Go to last post
  57. precision of two independent classifiers

    Consider two classifiers A and B giving binary labels to a big set of candidates, say, we have a million cats and a million dogs for labeling. Assume...

    Started by Zewei‎, 12-29-2014 10:12 AM
    machine learning, precision, probability
    • Replies: 0
    • Views: 230
    12-29-2014, 10:12 AM Go to last post
  58. Please help calculate the odds of this

    First off, let me say I know very little about math and even less about probabilities. I am a father of two teenage boys. One of them gave me a...

    Started by acofgb‎, 12-22-2014 12:55 PM
    • Replies: 11
    • Views: 571
    12-23-2014, 05:42 PM Go to last post
  59. Group Probability Problem

    Hi, I'm having a difficult time figuring out an approach to a problem and could use some help -- if I have a team of 5 basketball players, each...

    Started by bprs0713‎, 12-18-2014 08:40 PM
    • Replies: 3
    • Views: 383
    12-19-2014, 01:31 PM Go to last post
  60. Interpreting negative binomial regression with log transformed independent variables

    My independent variables were highly skewed, so to normalise the distribution they were log transformed. Also since there were zeros in the data,...

    Started by peter t.‎, 12-19-2014 01:12 PM
    incidence rate, lognormal, negative binomial model, regression
    • Replies: 0
    • Views: 235
    12-19-2014, 01:12 PM Go to last post

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