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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: 30,349
    09-30-2005, 09:44 AM Go to last post
  1. 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: 1,964
    03-17-2012, 05:21 PM Go to last post
  2. 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: 1,712
    02-07-2012, 01:34 PM Go to last post
  3. 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: 2,781
    01-09-2017, 08:22 PM Go to last post
  4. 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: 1,165
    07-22-2012, 08:21 PM Go to last post
  5. 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: 3,671
    05-06-2013, 07:37 AM Go to last post
  6. 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: 2,392
    07-18-2011, 11:48 AM Go to last post
  7. 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: 3,779
    12-04-2008, 01:44 PM Go to last post
  8. 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: 2,757
    11-27-2006, 01:20 AM Go to last post
  9. 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: 1,845
    08-02-2016, 05:58 PM Go to last post
  10. 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: 1,908
    01-25-2013, 11:17 PM Go to last post
  11. 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: 1,609
    01-03-2014, 03:16 PM Go to last post
  12. 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: 2,928
    11-28-2011, 12:35 PM Go to last post
  13. 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: 4,549
    09-28-2010, 11:39 PM Go to last post
  14. 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: 7,035
    10-07-2010, 10:42 AM Go to last post
  15. 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: 6,860
    01-18-2008, 03:59 PM Go to last post
  16. 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: 4,581
    01-18-2008, 02:40 PM Go to last post
  17. 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: 1,223
    12-29-2014, 10:12 AM Go to last post
  18. 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: 1,301
    10-29-2013, 04:26 PM Go to last post
  19. 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: 3,417
    06-21-2011, 09:07 AM Go to last post
  20. 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: 2,374
    12-30-2009, 04:16 AM Go to last post
  21. 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: 2,751
    01-01-2010, 07:28 PM Go to last post
  22. 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: 11,334
    01-08-2010, 08:36 AM Go to last post
  23. 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: 2,810
    01-24-2010, 04:19 AM Go to last post
  24. 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: 3,242
    01-27-2010, 08:53 AM Go to last post
  25. 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: 2,444
    01-24-2010, 04:32 AM Go to last post
  26. 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: 2,838
    01-24-2010, 02:07 PM Go to last post
  27. 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: 5,324
    01-24-2010, 08:02 AM Go to last post
  28. 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: 5,346
    01-24-2010, 07:49 AM Go to last post
  29. 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: 1,762
    10-07-2013, 12:13 AM Go to last post
  30. 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: 3,552
    05-17-2011, 12:56 PM Go to last post
  31. 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: 1,895
    12-21-2006, 06:33 PM Go to last post
  32. 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: 2,479
    12-22-2010, 12:24 PM Go to last post
  33. 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: 12,519
    01-03-2011, 11:10 AM Go to last post
  34. 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: 2,580
    06-13-2008, 09:34 PM Go to last post
  35. 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: 1,973
    10-17-2011, 08:19 AM Go to last post
  36. 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: 3,102
    02-24-2008, 10:01 PM Go to last post
  37. 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: 3,119
    07-07-2008, 09:42 AM Go to last post
  38. 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: 1,854
    03-23-2012, 01:52 PM Go to last post
  39. 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: 2,121
    10-04-2009, 04:37 AM Go to last post
  40. 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: 3,190
    10-05-2009, 04:09 PM Go to last post
  41. 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: 3,678
    10-05-2009, 02:59 AM Go to last post
  42. Question Probability problem help

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

    Started by zupanii‎, 02-05-2017 12:31 PM
    • Replies: 1
    • Views: 1,904
    02-05-2017, 12:59 PM Go to last post
  43. 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: 1,686
    05-01-2012, 09:36 PM Go to last post
  44. 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: 2,262
    11-07-2008, 07:03 AM Go to last post
  45. 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: 2,099
    07-28-2013, 09:27 AM Go to last post
  46. 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: 2,638
    04-09-2008, 01:09 AM Go to last post
  47. 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: 2,896
    10-08-2010, 12:21 AM Go to last post
  48. 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: 6,394
    12-05-2010, 05:27 PM Go to last post
  49. 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: 3,477
    02-04-2011, 03:09 PM Go to last post
  50. 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: 2,460
    02-04-2011, 03:03 PM Go to last post
  51. 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: 3,295
    03-05-2014, 08:05 PM Go to last post

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