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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: 30,322
    09-30-2005, 09:44 AM Go to last post
  1. 99% Confidence Interval

    Hi Guys, I'm stuck and need a little help on this one. I have calculated mean: 74.40 and Std Dev: 12.251 from Population 262, Sample 103. I...

    Started by Baseball Furies‎, 01-23-2011 04:40 PM
    • Replies: 3
    • Views: 5,517
    01-23-2011, 05:15 PM Go to last post
  2. ????HOW to decide Independance of 2 RVs thru joint density without calculation????

    given the joint density:f(x,y)=(x+1)(y+1)/8, |x+y|<=1, |x-y|<=1 Find the boundries of the domain of these RVs before any calculations. Are...

    Started by sajee3a‎, 10-09-2010 12:07 AM
    • Replies: 0
    • Views: 2,019
    10-09-2010, 12:07 AM Go to last post
  3. A bet between a buddy and I regarding the lottery

    Hello all, My coworker is convinced that the Powerball lottery is rigged against those players purchasing more than one game (set of 6 randomly...

    Started by metamologist‎, 09-02-2015 07:48 PM
    • Replies: 8
    • Views: 1,893
    09-08-2015, 11:23 AM Go to last post
  4. Cool a binomial probability question

    please help... Steele Electronics, Inc. sells expensive brands of stereo equipment in several shopping malls throghout the northwest section of...

    Started by mllgk‎, 12-17-2006 04:18 PM
    • Replies: 3
    • Views: 4,884
    12-20-2006, 05:25 PM Go to last post
  5. A bouncing ball is giving me fits.

    Hi. Thank-you for reading this. My name's Philip Ripper. I'm not a student. I'm a curious person with a fairly poor math education. This is...

    Started by Tethers‎, 04-11-2014 12:00 PM
    • Replies: 6
    • Views: 1,610
    04-11-2014, 08:53 PM Go to last post
  6. A Box containing coins question

    If a box contains 4 pennies, 4 nickels, 4 dimes and 2 coins are selected at random WITH replacement and D (>=0) is the numerical difference between...

    Started by ITman95‎, 11-22-2013 03:31 PM
    • Replies: 8
    • Views: 2,163
    11-25-2013, 04:37 PM Go to last post
  7. A box contains 5 tickets

    A box contains fives tickets, each with a letter on it: Box : S T A R T Once a day, for n days, a ticket will be drawn at random, with...

    Started by amazedmango‎, 05-08-2011 07:08 PM
    • Replies: 1
    • Views: 2,984
    05-10-2011, 04:35 AM Go to last post
  8. A challenge problem (for me at least)

    Hello everyone, this is my first post on this forum. My name is Ryan and I am a first year grad student in electrical engineering at a college in...

    Started by RyanM‎, 10-01-2011 05:47 PM
    • Replies: 1
    • Views: 3,645
    10-02-2011, 01:28 AM Go to last post
  9. A coin thrown probability question

    Hi all I could not explain this question by using "the product rule for independent events" - A coin is thrown four times. What is the probility...

    Started by bryanevil‎, 12-27-2011 08:57 AM
    • Replies: 2
    • Views: 1,936
    12-27-2011, 11:03 AM Go to last post
  10. A combinations problem

    Hello everyone! Im only beginning to study statistics. The problem is easy, yet I need help :o A shelf contains 6 separate compartments. In how...

    Started by Olga‎, 12-26-2006 03:35 AM
    • Replies: 1
    • Views: 4,648
    01-11-2007, 05:58 PM Go to last post
  11. A complex cards off the top of a deck problem

    My question is what is the probability of drawing at least one ace and at least one king from the top of a standard deck of cards. This question...

    Started by MrMonday‎, 07-04-2011 05:19 PM
    • Replies: 3
    • Views: 3,153
    07-05-2011, 11:47 AM Go to last post
  12. A conditional Pobability Problem

    Please see the attached plot to understand clearly the problem I am struggling with a conditional probability problem, i would appreciate if...

    Started by TIMO‎, 02-05-2010 01:54 PM
    • Replies: 2
    • Views: 2,927
    02-08-2010, 09:16 AM Go to last post
  13. A conditional prob. question

    Hi, I need some help regarding the following question. Given three random vectors- A, B,C where A and B are presumably statistically independent....

    Started by Dror‎, 05-25-2007 03:05 PM
    • Replies: 3
    • Views: 3,209
    05-27-2007, 01:25 AM Go to last post
  14. A contradiction in standard deviation.

    Hi there. When calculating the SD of a single spin on a European roulette wheel on a single number one gets: SD = 5.84 when using SD = sqrt...

    Started by TheDuck‎, 04-05-2011 08:17 PM
    • Replies: 1
    • Views: 2,299
    04-05-2011, 10:08 PM Go to last post
  15. A couple Normal Distribution Probability problems

    I've been trying to figure out the answer to these two problems for weeks, but I can't seem to figure out how to do them. Please let me know if you...

    Started by meaght12‎, 12-11-2014 02:19 PM
    • Replies: 7
    • Views: 2,161
    12-11-2014, 04:58 PM Go to last post
  16. A Couple of Questions Re: Birth and Death Processes

    Hello, I have a few homework questions regarding birth & death processes (CTMCs) that I'm having trouble solving: 1) Suppose a CTMC has a death...

    Started by jli‎, 12-06-2014 04:18 AM
    • Replies: 0
    • Views: 2,323
    12-06-2014, 04:18 AM Go to last post
  17. A Darts Problem

    In a game of darts the person that throws first in a leg has an advantage. The players take it in turns to go first. So if we assume Player A has a...

    Started by SPritchard‎, 04-25-2010 03:47 AM
    • Replies: 3
    • Views: 3,122
    04-25-2010, 02:23 PM Go to last post
  18. a defective probability problem

    I am trying real hard on solving this problem: A sample of 4 different cell phones is randomly selected from a group containing 15 that are...

    Started by carsont89‎, 10-27-2008 03:34 PM
    • Replies: 5
    • Views: 3,104
    10-28-2008, 08:47 AM Go to last post
  19. a discrete RV pdf

    The pdf of a discrete random variable is the following: f(x) = 36/(49x^2), for x = 1,2,3 What is the cdf of x? I'm not sure but I think...

    Started by Shaq's Left Nut‎, 10-03-2012 10:43 PM
    • Replies: 1
    • Views: 898
    10-03-2012, 10:58 PM Go to last post
  20. a doctor promises a 90% chance of a cure for your illness

    for $1000. For him to share the risk equally with you how much money should he put in escrow for you? Suppose you want him to share half the...

    Started by Outlier‎, 11-24-2010 08:49 PM
    • Replies: 2
    • Views: 2,780
    11-26-2010, 10:06 AM Go to last post
  21. A Drunkard's Random Walk

    Here's a homework problem that I need a hint to get started. D drunkard is taking a random walk. he canstep north or shouth with probability .5...

    Started by statsmom‎, 10-25-2008 11:24 PM
    • Replies: 3
    • Views: 4,823
    10-26-2008, 10:04 PM Go to last post
  22. a fair gambling game

    You want to invent a gambling game in which a person rolls two (unbiased) dice and is paid some money if the sum is 7, but otherwise he loses his...

    Started by majda‎, 08-06-2017 05:22 AM
    • Replies: 1
    • Views: 367
    08-06-2017, 05:37 AM Go to last post
  23. A Few More Questions...

    My study group and I are struggling.... 1) A certain lottery has 49 numbers, 6 of which are the winning numbers for a particular game. To play...

    Started by mlampingbhhs‎, 02-21-2006 01:21 PM
    • Replies: 2
    • Views: 2,374
    02-21-2006, 02:06 PM Go to last post
  24. A game with two dices

    Imagine a game with two players and referee. The referee rolls two unbiased dices: one of the dices outcome is a score and the other dice outcome...

    Started by lgon‎, 01-11-2014 09:06 AM
    dices, game
    • Replies: 3
    • Views: 1,258
    01-11-2014, 10:38 AM Go to last post
  25. A large and powerful corporation is extorting money from the public.

    When confronted with ****ing evidence the corporate CEO says these were rogue employees, these were anomalous cases, etc., etc., etc.. . . . ...

    Started by Outlier‎, 08-06-2011 04:00 PM
    • Replies: 5
    • Views: 2,424
    08-07-2011, 09:47 AM Go to last post
  26. A little confused

    I am doing these problems and I am looking at the shading, why is the 2 all the way on the right? Shouldn't it be on the left? And should the X and Z...

    Started by PSG‎, 03-25-2013 12:09 AM
    • Replies: 6
    • Views: 1,882
    03-31-2013, 03:57 AM Go to last post
  27. A little help

    I know that a event with two outcomes such as making a three throw in basketball doesn't necessarily have a probability of 0.50, it could range...

    Started by misterx‎, 05-16-2015 08:41 AM
    • Replies: 1
    • Views: 1,194
    05-18-2015, 07:42 AM Go to last post
  28. A little help please?

    This is the final question from my homework and I have been laboring over it for over an hour without much luck. "A certain type of seed has a...

    Started by schnakees‎, 06-11-2009 09:31 AM
    • Replies: 1
    • Views: 1,769
    06-11-2009, 10:28 AM Go to last post
  29. A little help with choosing tests?

    Hello, I am new here. A little background, I am a Masters of Forensic Science student with a little statistics knowledge. I am currently working...

    Started by blpierce76‎, 07-15-2015 09:39 AM
    • Replies: 9
    • Views: 1,988
    07-21-2015, 09:32 AM Go to last post
  30. A little help with distributions

    I have been assigned a project that involves statistics and i have no idea about it. I was suppose to capture online game traffi and then using the...

    Started by saeen‎, 10-13-2010 12:39 AM
    • Replies: 8
    • Views: 3,435
    10-18-2010, 01:07 PM Go to last post
  31. Lightbulb A little help with what seems to be conditional probability

    Hey guys, I want to make sure that I'm working this question correctly. Here goes: A jar has 5 white balls. A ball is taken out randomly - if it's...

    Started by fiffette‎, 08-24-2013 08:25 AM
    • Replies: 3
    • Views: 1,906
    08-26-2013, 04:56 PM Go to last post
  32. a little probability question

    An elevator goes from the ground floor up to the 8th floor (8 floors in total). In the elevator 10 people. Each one of them choose randomly and...

    Started by WeeG‎, 06-21-2010 09:53 AM
    • Replies: 2
    • Views: 2,412
    06-21-2010, 05:24 PM Go to last post
  33. A lottery question.

    So, I'm trying to help out a Euromillions syndicate to understand the probabilities of their different play options. The basic Euromillions lottery...

    Started by EricJ‎, 07-11-2012 01:55 PM
    • Replies: 1
    • Views: 1,502
    07-11-2012, 03:21 PM Go to last post
  34. Post a low correlation and a strong significance = can the null hypothesis be rejected?

    I have found that there is a very low negative correlation (r= - 0.17) with strong significance (p<0.0001) between A test and B test. The null...

    Started by emma13‎, 04-21-2016 10:42 AM
    pseudo-replication
    • Replies: 7
    • Views: 1,443
    04-22-2016, 09:07 AM Go to last post
  35. A probability confusion

    There are two packs of cards. pack A and pack B. A = {11, 12, 13, 15, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32} B = {11. 13. 15. 21. 22, 35}...

    Started by lihinii‎, 11-13-2011 07:25 PM
    • Replies: 1
    • Views: 2,858
    11-14-2011, 12:03 AM Go to last post
  36. a probability problem

    there are 1000 coins in a bag of which 999 are normal coins (with a head and a tail), and 1 is a ``freak'' coin which has two heads. if one coin is...

    Started by mithrandil‎, 09-19-2006 05:30 PM
    • Replies: 1
    • Views: 2,526
    09-19-2006, 08:17 PM Go to last post
  37. Poll Poll: A probability problem

    Hi all, I would like to solve the problem bellow. To some it might seem to eassy. However i would appreciate some hints. Thanks in advance ... ...

    Started by marius15‎, 04-26-2015 08:49 AM
    • Replies: 7
    • Views: 2,738
    04-26-2015, 04:51 PM Go to last post
  38. A probability question

    52 cards, 13 values (A to K) and 4 suits. what's the probability of getting 5 cards with a four-of-a-kind (same value)? My solution: first card...

    Started by tennis89‎, 06-28-2010 12:08 PM
    • Replies: 4
    • Views: 2,670
    06-28-2010, 01:25 PM Go to last post
  39. A probability question

    A spider eats 3 flies a day. Until the spider fills his quota a fly has a 50% chance of survival if he attempts to pass the web. Assuming 5 flies...

    Started by tennis89‎, 06-28-2010 10:28 PM
    • Replies: 1
    • Views: 4,467
    06-29-2010, 12:59 AM Go to last post
  40. A probability question

    a stick of length 1 is cut twice randomly, probability that 3 segments can form a triangle? x,y, 1-x-y x+y>1-x-y ==> x+y>1/2 1-x-y+x>y ==>...

    Started by tennis89‎, 07-09-2010 02:17 PM
    • Replies: 5
    • Views: 3,303
    07-16-2010, 12:01 PM Go to last post
  41. A probability question

    I am trying to revise for a test, and am working through some prep questions. I am struggling on this one, could anyone help? Suppose there is a...

    Started by bryce09‎, 08-22-2012 05:26 PM
    bayes, bayesian, probability
    • Replies: 4
    • Views: 1,213
    08-22-2012, 08:53 PM Go to last post
  42. 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: 1,598
    04-09-2014, 07:50 AM Go to last post
  43. A probability/stat elementary problem

    Hi, I am currently reviewing probabilities on my own and encountered problems which i can't seem to do. Hopefully someone here will be kind enough to...

    Started by gavinwkc‎, 01-29-2007 11:42 AM
    • Replies: 2
    • Views: 4,486
    01-31-2007, 01:54 PM Go to last post
  44. A problem about expected value

    given two variables satisfying uniformly distribution as p1~U(0,a1),p2~U(0,a2), there is a random variable defined as s=(a1*p2-a2*p1)/(p1+p2). ...

    Started by csulazybug‎, 11-24-2006 08:00 AM
    • Replies: 0
    • Views: 1,916
    11-24-2006, 08:00 AM Go to last post
  45. A problem about large deviation theory

    In a large deviation principle, a closed set can be found its upper bound while an open set can be obtained its lower bound. Why?

    Started by osuanle‎, 12-05-2006 03:44 PM
    • Replies: 0
    • Views: 2,318
    12-05-2006, 03:44 PM Go to last post
  46. Unhappy A problem about poisson process

    Hi all, I have a question about the poisson process. Below is the queston: Consider each transition of the poisson process as an event, for...

    Started by Laiton‎, 04-26-2009 04:56 PM
    • Replies: 0
    • Views: 2,441
    04-26-2009, 04:56 PM Go to last post
  47. Question A problem for the statistically inclined

    On the desk, you have 40 envelopes. Each contain a cash prize (unknown until opened): 5 - contain $10,000 6 - contain $5,000 9 - contain $1,000...

    Started by ChrisDoyle‎, 10-24-2006 07:39 PM
    • Replies: 3
    • Views: 2,972
    10-30-2006, 03:23 PM Go to last post
  48. A Problem on Joint Probability Distribution

    Hello people, I found this problem in an exam but i could not go very far on this. Problem: Let X and Y be jointly distributed random variables...

    Started by kamekaze‎, 12-10-2010 12:52 PM
    • Replies: 4
    • Views: 4,415
    07-12-2013, 10:20 PM Go to last post
  49. A problem related to Poisson process

    Hi all, I have a probability problem. Can you help me? Thank you! Here is the problem: Consider the queueing system, there are n customers 1,...

    Started by quacam09‎, 03-19-2009 12:28 PM
    • Replies: 0
    • Views: 1,991
    03-19-2009, 12:28 PM Go to last post
  50. A problem using Bayes Inference

    This is our Master Qualify Exam problem, please help! Thanks! In a large national park, the number of raccoons in a randomly-picked acre is a...

    Started by carfield‎, 11-13-2011 07:30 PM
    • Replies: 1
    • Views: 2,507
    11-14-2011, 12:27 AM Go to last post
  51. A Puzzling Probability Problem

    Hello everyone. I have encountered these problems. I tried to answer them, but I'm not sure if they are correct.:: I would be very grateful if...

    Started by Gelo‎, 07-08-2017 12:13 PM
    • Replies: 4
    • Views: 758
    07-09-2017, 04:15 AM Go to last post
  52. A puzzling problem

    Hello all, I am posting here looking for help on solving a probability problem I have been struggling with for 2 days. It has been several years...

    Started by Jheath9131‎, 04-14-2017 07:33 AM
    • Replies: 3
    • Views: 1,282
    04-18-2017, 02:38 PM Go to last post
  53. a question

    Hi I need an answer Consider N variables uniform distributed over the set 0 and 1. What is the highest expected value among them? Thx, Ori

    Started by ori‎, 03-21-2011 01:36 AM
    • Replies: 1
    • Views: 2,026
    03-21-2011, 08:57 AM Go to last post
  54. a question about discrete RV

    hello, I have a question about discrete RV. Five fair coins are tossed. The coins that fall on "Head" are removed and the rest of them are tossed...

    Started by avsha43‎, 08-07-2014 03:56 PM
    • Replies: 11
    • Views: 1,695
    08-08-2014, 07:38 AM Go to last post
  55. a question about normal distribution

    Hi, there, Since I can not edit equation, please see the attachment for it. I can not understand this equation. If it's a normal...

    Started by bobwm‎, 06-21-2009 04:59 PM
    • Replies: 0
    • Views: 2,428
    06-21-2009, 04:59 PM Go to last post
  56. A question about sampling

    Consider two probability distributions, A and B. A has greater variance than B, but A and B have equal means. We are not told anything about their...

    Started by BigBugBuzzz‎, 11-11-2011 10:51 PM
    sampling, variance
    • Replies: 13
    • Views: 3,740
    04-27-2012, 09:52 AM Go to last post
  57. A question about the distribution of random numbers

    Suppose I have two independent random variables A, and B, which are distributed Normally as follows: A: N~(MA,VA) B: N~(MB,VB) Now consider...

    Started by BigBugBuzzz‎, 09-18-2012 09:06 AM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 5,763
    09-20-2012, 08:35 AM Go to last post
  58. A question about the distribution of random numbers - PART II

    Thanks to BGM and Dragan, my problem posted under the thread " A question about the distribution of random numbers" now appears to be solved! The...

    Started by BigBugBuzzz‎, 09-20-2012 08:59 AM
    • Replies: 7
    • Views: 1,546
    09-20-2012, 05:12 PM Go to last post
  59. a question for Makov inequality

    Given 0<\lambda<1, can we show \mathrm{P}\le \sum _{i=1}^{n} E/\epsilon^{\lambda}? I think we can get the result by Markov inequality if we know...

    Started by JoeW‎, 11-14-2011 06:43 PM
    • Replies: 3
    • Views: 3,554
    11-15-2011, 05:49 PM Go to last post
  60. A question in order statistics of continuous type distribution

    Let X1,X2, be a sequence of random variables from a continuous type distribution and m and n be two integers such that m<n, and 2≤n−m. How can I...

    Started by hadiSanji‎, 03-30-2014 08:32 PM
    probability
    • Replies: 1
    • Views: 1,510
    03-30-2014, 11:02 PM Go to last post

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