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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: 30,181
    09-30-2005, 09:44 AM Go to last post
  1. Homework Help! Axioms of Probability

    Hi, so I've been stuck on three problems after multiple submissions and still cannot get it right! Can someone help and mind explaining? The bolded...

    Started by _xoxochip_‎, 03-05-2014 08:05 PM
    • Replies: 0
    • Views: 3,247
    03-05-2014, 08:05 PM Go to last post
  2. from Uniform random variable to Logistic

    Given U~Unif(0,1) and X=s*ln(U/(1-U)), where s>0 is a parameter, I am hoping to get F(x), where F(x) would turn out to be a logistic cdf F(x) =...

    Started by zzzc‎, 10-07-2010 10:25 PM
    • Replies: 4
    • Views: 2,868
    10-08-2010, 12:21 AM Go to last post
  3. y follows a Poisson distribution with rate lambda*x

    Assume that the number of faults in the roll, say y, follows a Poisson distribution with rate lambda*x, where x is the length of the roll. Does this...

    Started by zzzc‎, 11-10-2010 03:07 PM
    • Replies: 4
    • Views: 6,339
    12-05-2010, 05:27 PM Go to last post
  4. empirical distribution

    Let (x1, , xn) be iid random variables with the common cdf F(x). The empirical distribution is defined as F_n(x) = P_{Fn}(X<x) = \frac{1}{n}...

    Started by zzzc‎, 01-25-2011 09:39 PM
    • Replies: 1
    • Views: 3,443
    02-04-2011, 03:09 PM Go to last post
  5. red/white balls, distinct values X1,...,Xn

    There are (2n-1) choose (n-1) ways that n-1 red balls can be put in a line with n white balls. Can someone explain why? Thanks.

    Started by zzzc‎, 01-28-2011 09:12 PM
    • Replies: 1
    • Views: 2,428
    02-04-2011, 03:03 PM Go to last post
  6. Question Quads over Quads hhmmmmm

    I was wondering if anyone new how to calculate the odds of Quads beating Quads in a texas holdem game. Assuming their were no bets to make folders. ...

    Started by ZZ0QYMZZ‎, 04-09-2008 01:09 AM
    • Replies: 0
    • Views: 2,608
    04-09-2008, 01:09 AM Go to last post
  7. counting probability

    i need some help counting probability using Bayes theorem given that 1/10 of message is a spam message. spam detector will correct identify a...

    Started by zxcvbnm123‎, 07-24-2013 03:03 PM
    • Replies: 5
    • Views: 2,081
    07-28-2013, 09:27 AM Go to last post
  8. Questions need help!!

    Weekly demand for packs of a certain make of chocolate trifle at a major supermarket store has a Normal distribution with mean of 200 and standard...

    Started by zxadriano‎, 11-07-2008 07:03 AM
    • Replies: 0
    • Views: 2,242
    11-07-2008, 07:03 AM Go to last post
  9. Which sampling type to use?

    What kind of sampling do researchers use to estimate population parameters on individual data? a. population sampling b.nonprobability sampling...

    Started by zwardla‎, 05-01-2012 08:22 PM
    • Replies: 1
    • Views: 1,660
    05-01-2012, 09:36 PM Go to last post
  10. Question Probability problem help

    I need help with 2 quizes: first: ...

    Started by zupanii‎, 02-05-2017 12:31 PM
    • Replies: 1
    • Views: 1,865
    02-05-2017, 12:59 PM Go to last post
  11. Density function?

    Please can you help me solve this the pdf of continues r.v. X where f(x) {(2x 0≤x≤1 0 elsewhere} 1)...

    Started by zulkfal_1981‎, 10-04-2009 06:49 PM
    • Replies: 4
    • Views: 3,158
    10-05-2009, 04:09 PM Go to last post
  12. Joint density

    Am a software engineer, and not know much about statsitics but have to explain my younger brother, please help me with this, thanks X1 and X2 have...

    Started by zulkfal_1981‎, 10-04-2009 07:55 PM
    • Replies: 2
    • Views: 3,630
    10-05-2009, 02:59 AM Go to last post
  13. Exclamation Plz help on this question?

    My younger brother asked me and am stuck? Question: Find the probability that exactly four observations of a random sample of size 5 from the...

    Started by zulkfal‎, 10-04-2009 02:37 AM
    • Replies: 1
    • Views: 2,096
    10-04-2009, 04:37 AM Go to last post
  14. Rick Durrett definition of markov property

    Dear forumers This is my first post - I hope this is the right place for the post and that this forum covers these kind of questions. I have...

    Started by zuki‎, 03-23-2012 01:52 PM
    • Replies: 0
    • Views: 1,842
    03-23-2012, 01:52 PM Go to last post
  15. probability of exceedence

    Hi all, I'm new here, but I have a problem I can't figure out. I have wave height data from the past 13 years and I fitted the data with a...

    Started by zuid‎, 07-07-2008 09:42 AM
    • Replies: 0
    • Views: 3,088
    07-07-2008, 09:42 AM Go to last post
  16. Help with problem on expected value, covariance, and mean of linear function

    I attached a picture of the problem I am having trouble with. I know how to do a (just add the rows and columns). I'm a little confused on b,...

    Started by zswanson17‎, 02-24-2008 09:34 PM
    • Replies: 2
    • Views: 3,073
    02-24-2008, 10:01 PM Go to last post
  17. Dice and Don't Cares

    Hi. I'm working on deriving a probability formula to help in some research I'm doing, but I've hit a wall. I've managed to reduce my problem down...

    Started by zogg‎, 10-13-2011 07:26 AM
    dice
    • Replies: 3
    • Views: 1,940
    10-17-2011, 08:19 AM Go to last post
  18. Estimate P(F and M) by P(F), P(M)

    Hi guys: I need help from stats experts. First of all I'm working in market research and no longer a student anymore. What I have are projects...

    Started by zli034‎, 06-13-2008 05:09 PM
    • Replies: 2
    • Views: 2,539
    06-13-2008, 09:34 PM Go to last post
  19. Normal Distribution Help Please

    Hi, in my homework, I am stuck on a three part question. I have managed to do the first part of the question but can't understand how to do the...

    Started by zkm1223‎, 12-21-2010 11:42 AM
    • Replies: 3
    • Views: 2,454
    12-22-2010, 12:24 PM Go to last post
  20. Please can you check my answers

    Q1) A Newspaper dealer sells 1 newspaper every 6 mins on average. You can assume it follows a Poisson Distribution. a) Whats the probability that...

    Started by zkm1223‎, 12-27-2010 08:06 AM
    2 Pages
    1 2
    • Replies: 27
    • Views: 12,331
    01-03-2011, 11:10 AM Go to last post
  21. probability for "identity"

    In a new show on tv, a contestant has to guess the identity of 12 strangers. To win the grand prize the contestant has to guess all twelve. I...

    Started by zipzapzop‎, 12-20-2006 06:05 PM
    • Replies: 2
    • Views: 1,876
    12-21-2006, 06:33 PM Go to last post
  22. Probably of success for 3 mutually exclusive events

    I have been removed from the details of this since college over 20 years ago... Here is my question... For event A, probability of success is 30%...

    Started by zinzah‎, 05-17-2011 10:52 AM
    • Replies: 5
    • Views: 3,504
    05-17-2011, 12:56 PM Go to last post
  23. Gamma Distribution and data fitting

    I have a problem with data fitting to gamma distribution. I have rainfall occurrences (calculated using 1st order 2 states Markov Chain analysis) for...

    Started by zhouy‎, 10-07-2013 12:13 AM
    gamma distribution, markov chain, maximum likelihood, rainfall probability
    • Replies: 0
    • Views: 1,736
    10-07-2013, 12:13 AM Go to last post
  24. help with some question

    hi there are some questions i was unable to solve. i will describe them and say where exactly my problem is. 1. a fair cube (with six surfaces) is...

    Started by zhenyazh‎, 12-29-2009 04:13 AM
    • Replies: 2
    • Views: 2,357
    12-30-2009, 04:16 AM Go to last post
  25. predictions

    hi, when i am asked to give a prediction about X in which cases i use what: 1. most probable x 2. e(x) 3.e(x|y) 4. x=ay+b thanks

    Started by zhenyazh‎, 01-01-2010 07:21 AM
    • Replies: 1
    • Views: 2,727
    01-01-2010, 07:28 PM Go to last post
  26. ex(xy)

    Hi, i can't figure out how do i calculate e(xy) in cases they are not independent and lets say they have the same distribution, for instant...

    Started by zhenyazh‎, 01-06-2010 01:47 AM
    • Replies: 1
    • Views: 11,265
    01-08-2010, 08:36 AM Go to last post
  27. problem with convergance of probability

    hi, this is a simple on but some how i get a result different from what the professor got. i guess i am wrong but i dont know why. i need to find...

    Started by zhenyazh‎, 01-23-2010 03:20 AM
    • Replies: 3
    • Views: 2,764
    01-24-2010, 04:19 AM Go to last post
  28. best forecast

    hi, i have been solving this question and my result is different than the results i have been given to compare to. can u please tell me if i am...

    Started by zhenyazh‎, 01-24-2010 04:26 AM
    • Replies: 1
    • Views: 3,208
    01-27-2010, 08:53 AM Go to last post
  29. variable dependency check

    hi, i am a bit confused. i know how to check if two variables are not correlated. but how do i check they are independent? for instance i have...

    Started by zhenyazh‎, 01-24-2010 04:32 AM
    • Replies: 0
    • Views: 2,411
    01-24-2010, 04:32 AM Go to last post
  30. forecast and fine

    hi, am i solving it right? a coin is flipped twice with probability of 2/3 for heads. you are supposed to forecast the number of heads with fine...

    Started by zhenyazh‎, 01-24-2010 04:48 AM
    • Replies: 1
    • Views: 2,810
    01-24-2010, 02:07 PM Go to last post
  31. even and odd probability of coin

    hi, i am preparing for an exam and i wondered if some one could show me explicitly how to calculate the probability of getting an even number of...

    Started by zhenyazh‎, 01-24-2010 06:51 AM
    • Replies: 1
    • Views: 5,272
    01-24-2010, 08:02 AM Go to last post
  32. correlation coefficient

    hi another exam preparation question: let x1..xn be random varibale independent and with same dist. they have exp. u and variance v. let m be a...

    Started by zhenyazh‎, 01-24-2010 07:12 AM
    • Replies: 2
    • Views: 5,294
    01-24-2010, 07:49 AM Go to last post
  33. Problem of a biased coin

    Hi! I am having problems to solve the subsequent probability problem: A person has a biased coin. It was fabricated in a way that there is more...

    Started by zgz‎, 06-21-2011 08:27 AM
    • Replies: 1
    • Views: 3,383
    06-21-2011, 09:07 AM Go to last post
  34. Who can solve this probability problem?

    Hi all, We have a population of people (denoted by S=30000). Assume that we want to divide this population into groups (denoted by D) consisting...

    Started by zFADwww7‎, 10-29-2013 04:26 PM
    • Replies: 0
    • Views: 1,284
    10-29-2013, 04:26 PM Go to last post
  35. 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: 1,207
    12-29-2014, 10:12 AM Go to last post
  36. i need help with normal distribution please

    i can't answer this example...can anyone help me asap please.. The diameter of the dot produced by a printer is normally distributed with a mean...

    Started by zerofreeze‎, 01-18-2008 02:49 AM
    • Replies: 5
    • Views: 6,796
    01-18-2008, 03:59 PM Go to last post
  37. help with this problem

    someone explain the answer of this question ...i have the answers but i want to know the formulas ... An assembly consists of three mechanical...

    Started by zerofreeze‎, 01-18-2008 02:40 PM
    • Replies: 0
    • Views: 4,554
    01-18-2008, 02:40 PM Go to last post
  38. Probability help needed

    Each state of the 50 in the US has two senators. What is the probability that in a random committee of 50 senators (a) Maryland is represented (b)...

    Started by Zennie‎, 09-28-2010 09:55 PM
    • Replies: 1
    • Views: 4,512
    09-28-2010, 11:39 PM Go to last post
  39. Probability question in section involving conditonal probability

    With probability of 1/6 there are i defective fuses among 1000 fuses (i = 0, 1, 2, 3, 4, 5). If among 100 fuses selected at random, none was...

    Started by Zennie‎, 10-07-2010 12:24 AM
    • Replies: 1
    • Views: 6,973
    10-07-2010, 10:42 AM Go to last post
  40. help for task in R programming language

    This is my task. I don't know how to solve it in R studio. Please help me!!! Simulate: a) 15 values from N(0,1) distribution b) 50 values from...

    Started by zemzela‎, 11-27-2011 05:24 AM
    density function, means, plot, r programming help, standard deviation
    • Replies: 4
    • Views: 2,876
    11-28-2011, 12:35 PM Go to last post
  41. Need help

    hey guys, I found this forum using google. and I really hope you guys can help me. This is the question: Every box of a smartphone has a coupon...

    Started by zekit‎, 01-03-2014 08:37 AM
    • Replies: 4
    • Views: 1,575
    01-03-2014, 03:16 PM Go to last post
  42. Networking probability theory; packet length, time of transmission, etc; need help

    Assume that an application sends packets over a communication link with a capacity of C bits per second, i.e. when the packet is l0 bits long, then...

    Started by zeion‎, 01-25-2013 03:07 PM
    • Replies: 2
    • Views: 1,880
    01-25-2013, 11:17 PM Go to last post
  43. Post Vehicles accident probability

    Hi, I would like to know the probability of Vehicles accident in a street. Which kind of probability distribution should I use? Please Help me :)...

    Started by zeezoo‎, 08-01-2016 03:10 PM
    • Replies: 2
    • Views: 1,823
    08-02-2016, 05:58 PM Go to last post
  44. Probability Question

    Hello there!!! I wonder if anyone familiar with the probability theory can help me to clarify the following. There is trading system which...

    Started by zealot‎, 11-26-2006 02:39 PM
    • Replies: 5
    • Views: 2,727
    11-27-2006, 01:20 AM Go to last post
  45. Equal probability in each direction

    "A drunk is standing on the sidewalk 40 steps from home and 30 steps from the nearest bar. He takes a step towards home or a step towards the bar...

    Started by zbirdie‎, 11-23-2008 01:07 PM
    • Replies: 3
    • Views: 3,726
    12-04-2008, 01:44 PM Go to last post
  46. Basic probability

    Whilst I've done pg stats (like 30+ years ago) and still use them a bit, I'm now wishing to look more closely at the basis of probability. With that...

    Started by Zarathrustra‎, 07-18-2011 11:48 AM
    • Replies: 0
    • Views: 2,370
    07-18-2011, 11:48 AM Go to last post
  47. Probability distribution of active calls at a telephone exchange

    Please, could someone help me with this exercise from this book: Suppose that calls arrive at a telephone exchange according to a Poisson process...

    Started by zakmck‎, 05-05-2013 12:35 PM
    • Replies: 6
    • Views: 3,633
    05-06-2013, 07:37 AM Go to last post
  48. Probability Question. Help!

    I have two questions that I'm stuck on: Question #1: Assume you have applied for two scholarships, scholarship A and scholarship B. The...

    Started by zain.j92‎, 07-22-2012 09:35 AM
    • Replies: 1
    • Views: 1,146
    07-22-2012, 08:21 PM Go to last post
  49. Exclamation Bayes Rule!

    Hi, My question is: A company wishes to evaluate the effectiveness of a marketing campaign. Seventy-five percent of all customers using the...

    Started by Zahra98‎, 01-09-2017 07:43 PM
    • Replies: 1
    • Views: 2,730
    01-09-2017, 08:22 PM Go to last post
  50. Help - Normal Distribution Problem

    Dear readers, I am puzzled by the following Normal Distribution equation:- f(x) = 1/sqrt(2*pi*variance) * e^ (-/(2*variance)) Correct me if...

    Started by zahg‎, 02-05-2012 05:11 AM
    • Replies: 2
    • Views: 1,683
    02-07-2012, 01:34 PM Go to last post
  51. Mann Whitney vs Kolmogrov-Smirnov Z ?

    Hi forum, I'm brand new here. :wave: I'm working on my master's thesis in behavioral finance. I'm trying to ascertain whether temperature has an...

    Started by zaghloul‎, 03-17-2012 04:48 PM
    • Replies: 2
    • Views: 1,947
    03-17-2012, 05:21 PM Go to last post
  52. Calculating probability of the expected number of runs needed

    Hello, I'm working on a personal project but I've hit a bit of a wall in working out an equation. I'd like to find the probability of a result given...

    Started by Zackley‎, 09-28-2015 01:03 AM
    • Replies: 6
    • Views: 1,823
    09-28-2015, 02:25 PM Go to last post
  53. Stuck on this

    The probability of an event happening is 20%. How many times would you have to do this to get an 80% chance of it happening at least 3 times?

    Started by ZachyT‎, 06-24-2011 12:22 PM
    • Replies: 5
    • Views: 2,265
    06-26-2011, 09:03 PM Go to last post
  54. Probability of Independent Events

    Hi, If hypothetical events A and B are independent, with P(B/A)=.4, and P(A)=.3 What is the P(B)? What formula would you use to figure this...

    Started by yzhao5‎, 08-02-2012 04:17 PM
    • Replies: 9
    • Views: 2,375
    08-05-2012, 12:39 PM Go to last post
  55. Poisson Question

    Got a question here about an antenna designed to withstand 50mph wind ( 20m abover ground) the 50mph wind occurs once every 30 years on average. What...

    Started by Yvonne M‎, 01-10-2010 11:40 AM
    • Replies: 5
    • Views: 2,678
    01-10-2010, 03:50 PM Go to last post
  56. binomial distribution

    If every person tossed a coin 5 times, what is the probability of observing 5 tails if there are 1000 people? i can work out the answer if only...

    Started by Yvonne M‎, 01-10-2010 03:16 PM
    • Replies: 1
    • Views: 2,899
    01-10-2010, 03:49 PM Go to last post
  57. Kruskal Walis & Wilcoxon test

    Hi all, it would be so kind if someone could explain to me as to why both equations, Kruskal Walis and Wilcoxon, consists of the number 12? The...

    Started by yuyanc‎, 08-11-2017 01:19 PM
    • Replies: 1
    • Views: 545
    08-11-2017, 02:01 PM Go to last post
  58. Help with these probability problems

    1. Conditional Prob: Approximately 1/125 of all births are fraternal twins and 1/300 of births are identical twins. Elvis Presley had a twin brother...

    Started by yupeh‎, 12-30-2006 06:59 AM
    • Replies: 1
    • Views: 6,299
    01-13-2007, 12:58 PM Go to last post
  59. regression choice

    I made survey for my master tesis. And it is a problem now to choose the method to analyse the model. I can use buying probability after event or...

    Started by yulia‎, 02-19-2013 03:12 PM
    • Replies: 3
    • Views: 1,672
    02-19-2013, 04:39 PM Go to last post
  60. Question prob. questions

    Let we have 3 urns with a white, b black balls in each urn. We choose one ball from urn 1 and transform it to urn 2. Then, choose one ball from urn 2...

    Started by yuki‎, 10-20-2010 04:01 AM
    • Replies: 5
    • Views: 2,914
    10-20-2010, 05:01 PM Go to last post

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