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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: 31,130
    09-30-2005, 09:44 AM Go to last post
  1. Angry !!!URGENT!! convolution problem

    a signal x(t)=delta(t) is filtered by the filter f(t)=u(t)-u(t-1) multiple times. *compute and plot the result of the first and second application...

    Started by sajee3a‎, 11-02-2010 12:42 AM
    • Replies: 0
    • Views: 2,755
    11-02-2010, 12:42 AM Go to last post
  2. !HELP! in PROBABILITY Question! Please!

    A Level Statistics Question (Probability) Q. In a class, 25% of students are British and 55% are American. If 15% are both British & American,...

    Started by omercheema‎, 11-25-2007 10:06 AM
    • Replies: 1
    • Views: 3,350
    12-11-2007, 04:49 PM Go to last post
  3. #s out of a bag!

    Hello, I am new to the forum, and have joined because the following question has stumped me. There are 11 balls in a bag numbered 0-11. You...

    Started by moose8500‎, 11-13-2015 06:01 PM
    • Replies: 0
    • Views: 1,368
    11-13-2015, 06:01 PM Go to last post
  4. Μarginal Distributions of f(x,y)

    f(x,y) = e^(-x), 0<=x<inf, 0<=y<=1 To find the marginal PDFs here is what I did so far: Marginal Distribution of x: f(x) = integral...

    Started by alias‎, 10-16-2011 06:28 AM
    • Replies: 2
    • Views: 123,421
    10-16-2011, 12:42 PM Go to last post
  5. α = 0.05 vs p-value?

    So I've got a couple questions on my stats homework as follows: E. Canis infection is a tick-bone disease of dogs that is sometimes contracted by...

    Started by ryant‎, 09-29-2012 07:09 PM
    • Replies: 4
    • Views: 52,793
    09-30-2012, 04:51 AM Go to last post
  6. π-system and monotone class

    Assume P is a π-system (that is, P is closed under finite intersections) and M is monotone class (that is M is a non-empty collection of subsets of Ω...

    Started by hadiSanji‎, 12-17-2011 05:50 AM
    probability theory
    • Replies: 3
    • Views: 132,150
    12-17-2011, 10:54 AM Go to last post
  7. φ Distribution Table

    Hi, I'm currently looking for the φ distribution table, to calcuate marginal effects in a probit model. Unfortunatly there isn't one in my...

    Started by PaulDaniel‎, 04-15-2011 05:59 AM
    • Replies: 0
    • Views: 189,174
    04-15-2011, 05:59 AM Go to last post
  8. "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: 2,301
    04-26-2011, 11:22 AM Go to last post
  9. "either but not both" ??

    Hi, I was trying to complete this question, but I'm confused about where either but not both comes in: "certain chickens on a large farm have...

    Started by rlm‎, 09-10-2012 03:32 PM
    • Replies: 2
    • Views: 4,316
    09-10-2012, 04:43 PM Go to last post
  10. "Exploding" Dice Probability (Talk to me like I'm an idiot)

    Hi All, First off, let me just start by saying that my mathematical savvy leaves a lot to be desired. I didn't take a lot of math in school, and...

    Started by RWinnie‎, 10-05-2016 09:01 PM
    • Replies: 1
    • Views: 2,014
    10-06-2016, 01:04 AM Go to last post
  11. "Fair Game" problem

    Hello, I'm new here. I joined in the hope that someone would be able to help me with this problem: --- Players A and B play a fair game for $20:...

    Started by testyou‎, 05-15-2007 03:17 PM
    • Replies: 1
    • Views: 3,731
    05-18-2007, 12:54 PM Go to last post
  12. "Hepatitis" and "Golf" probabilities.

    I'm having some trouble with these... A test for Hepatitis A is 98% accurate: if a person has Hepatitis, the test will come out "positive" with...

    Started by DAI&DF‎, 05-31-2008 11:29 PM
    • Replies: 7
    • Views: 7,229
    06-01-2008, 06:51 PM Go to last post
  13. "Lifetime risk"

    I need a bit of help understanding this concept. I have a paper published in Lancet that show data on the short-term and lifetime risks for...

    Started by Silvanus‎, 03-01-2009 06:21 PM
    • Replies: 2
    • Views: 2,374
    03-01-2009, 09:49 PM Go to last post
  14. "Naturally occurring" left-skewed distributions?

    hello there. for thesis purposes i'm finding myself with the need to simulate left-skewed distributions with a level of skewness i can determine...

    Started by spunky‎, 07-22-2012 08:10 PM
    • Replies: 2
    • Views: 3,893
    07-30-2012, 12:04 PM Go to last post
  15. "Show that fY|X(y) is a density function of a true probability distribution"

    Where do I begin?? The course I'm taking is focusing heavily on proofs like this, and I'm studying it at a distance so my opportunity to ask...

    Started by xandalorian‎, 11-11-2014 12:20 AM
    • Replies: 3
    • Views: 1,944
    11-12-2014, 05:37 AM Go to last post
  16. "Six nines" reliability vs. safety factor

    Aircraft are supposed to have a 99.9999 % chance that they will work over some specified time interval. If a picture weighs 25# and you want the...

    Started by Outlier‎, 05-20-2011 10:41 AM
    • Replies: 3
    • Views: 4,704
    05-20-2011, 06:05 PM Go to last post
  17. "with and without replacement" question

    hi, thanks for taking a look. im stumbling on trying to understand one question. the problem is: a box of nine gloves contains two left handed...

    Started by skrib09‎, 09-10-2009 02:26 PM
    • Replies: 1
    • Views: 5,932
    09-15-2009, 12:39 PM Go to last post
  18. 'Bayesian version' of the Cramer-Rao lower bound?

    just wondering if there is some sort of "Bayesian version" of that very useful and popular result that people use in maximum likelihood, the...

    Started by spunky‎, 07-30-2012 09:31 PM
    • Replies: 3
    • Views: 2,953
    07-30-2012, 10:00 PM Go to last post
  19. 'Shifted' Poisson Processes?

    Hi all. Im a graduate student in ops research, but my research is in the optimization side of things more so than the stochastic processes. I...

    Started by TeoNichelli‎, 05-17-2013 03:22 PM
    • Replies: 2
    • Views: 10,912
    05-18-2013, 03:05 PM Go to last post
  20. (Bayesian) Frequency and Likelihood Ratio Substitution

    I've been trying to learn Bayesian statistics "on my own" and part of how I study is by reading on its application in Court. Recently I've been...

    Started by Sakurabe‎, 12-26-2015 04:15 AM
    • Replies: 1
    • Views: 1,895
    12-26-2015, 05:54 AM Go to last post
  21. (Simple) proof for the arithmetic mean?

    Hello. I am having trouble trying to figure out a way to answer this homework exercise: "Prove that the arithmetic mean cannot be greater than the...

    Started by will22‎, 02-05-2014 11:27 AM
    • Replies: 5
    • Views: 2,283
    02-05-2014, 03:48 PM Go to last post
  22. (Simple?) probability question...

    Three coins. One is fair; one is two-headed; one is two-tailed. We pick a coin at random, flip it, and it comes out heads. The probability that...

    Started by jesse2‎, 12-15-2011 11:14 AM
    • Replies: 7
    • Views: 2,507
    12-15-2011, 12:05 PM Go to last post
  23. (What may be) A beginner problem!

    Just as a disclaimer, I have never taken a probability or stats course, so please excuse me for not being up to snuff around here. Anyhow, for my CS...

    Started by coogan‎, 04-25-2013 11:08 AM
    • Replies: 0
    • Views: 1,610
    04-25-2013, 11:08 AM Go to last post
  24. *Rate of Ruin & Optimal N

    For a fair coin toss game, both prob(ruin) & prob(consecutive losses) increases with no. of trials. Is the Rate of ruin .i.e.where prob(ruin)...

    Started by coolcat‎, 11-26-2011 02:53 AM
    • Replies: 13
    • Views: 4,053
    11-28-2011, 12:21 PM Go to last post
  25. 1 out 101

    Hi, I am hoping that someone can help me out with this? If I have 54 numbers on a roulette table, and there is a random generator picking the...

    Started by simon check‎, 11-22-2012 03:07 PM
    • Replies: 2
    • Views: 1,489
    11-23-2012, 05:28 AM Go to last post
  26. 1-bimoncdf vs binomcdf

    Hey, everyone. I'm new here, and I was just wondering what the difference is between 1-Binomcdf and Binomcdf?

    Started by hergreenatrocity‎, 05-14-2013 11:10 AM
    1-binomcdf, binomcdf, binomial, binomial probability, probability
    • Replies: 2
    • Views: 4,055
    05-14-2013, 12:33 PM Go to last post
  27. 10 books are arranged on a shelf randomly...

    10 books are arranged on a shelf randomly. A) What's the probability that between the books "Cinderella" and "The Hobbit" 3 books exactly will...

    Started by nerd_girl‎, 12-24-2008 07:36 AM
    • Replies: 3
    • Views: 3,270
    12-26-2008, 02:48 PM Go to last post
  28. Unhappy 1000 points Game

    Hi Guys, I got this problem from one of my friend. The problem is: A player starts of with 10 points. If he reaches 1000 points he wins. ...

    Started by vinux‎, 09-05-2008 06:32 AM
    • Replies: 1
    • Views: 4,028
    09-09-2008, 03:51 AM Go to last post
  29. 10x 1/100

    Hi all, Apologizes for the easy question: Imagine a dangerous mountain where the chance of dying is 1%. If a group of 10 hikes the moutain,...

    Started by STAlexis‎, 09-30-2017 08:58 PM
    • Replies: 1
    • Views: 240
    10-01-2017, 02:07 AM Go to last post
  30. 12-sided dice probability

    How would you give a sample space of rolling a pair of 12-sided dice?

    Started by myra619‎, 10-19-2007 10:02 PM
    • Replies: 2
    • Views: 9,846
    10-20-2007, 06:53 PM Go to last post
  31. 13 card straight - Calculation correct?

    Hello! I am trying to compute the Pr. of being dealt a 13 card straight out of a standard 52 card deck. (ie. 23456789TJQKA) Here's my...

    Started by datune‎, 03-05-2009 10:55 AM
    • Replies: 1
    • Views: 5,624
    03-14-2009, 01:38 PM Go to last post
  32. 15 people (including you) apply for 7 jobs. What are your chances of getting the job?

    Hi :wave: Allow me to extend my thanks to you all for taking the time to visit this thread. I came across this seemingly simple probability...

    Started by cridex‎, 12-29-2011 12:08 PM
    2 Pages
    1 2
    probability question
    • Replies: 16
    • Views: 7,541
    12-30-2011, 02:39 PM Go to last post
  33. 19 lowercase letters + 1 single digit number = possible combinations ?

    Hi everybody and happy new year too all :tup: I've just discovered this forum today and I have one thing to say : AWESOME ! :) I have trouble...

    Started by frederic1‎, 01-17-2011 01:23 PM
    • Replies: 10
    • Views: 7,576
    01-20-2011, 03:42 AM Go to last post
  34. 1st order or 2nd order distribution

    Hi, I'm fitting a distribution to the starting times of the first car journey in the day. I have a sample of 3,000 journey starting times. I am...

    Started by bradyj2‎, 11-03-2012 08:55 AM
    • Replies: 0
    • Views: 2,211
    11-03-2012, 08:55 AM Go to last post
  35. [SOLVED] 1st year Biostats student very lost!!! Please help...

    I have this question that I believe I have the correct answer for, however, I am unsure as to exactly what the proper formula is (and obviously...

    Started by kelly g‎, 01-27-2012 07:32 PM
    • Replies: 6
    • Views: 2,582
    01-27-2012, 09:01 PM Go to last post
  36. 2 four sided dice, probability of 1 dice = 3, sum = even

    2 four tetrahedral dice with sides, 1,2,3,4. the two dice are thrown, what is the probability that given the first dice is a 3, the sum of the 2...

    Started by Hans Rudel‎, 04-24-2012 04:19 AM
    2 dice, conditional probability
    • Replies: 1
    • Views: 12,093
    04-24-2012, 08:56 AM Go to last post
  37. 2 Probability problems

    I am taking statistics at my local community college and am ONLY doing it because it is required for a BSN degree. I am a 4.0 student, but most of my...

    Started by notamathwiz‎, 06-16-2008 11:10 AM
    • Replies: 2
    • Views: 6,608
    06-16-2008, 03:14 PM Go to last post
  38. 2 probability question

    I have just recently been learning probability and I have been having troubles with some questions. If someone can help me on these two question, I...

    Started by munkeyb0i‎, 04-10-2006 07:49 PM
    • Replies: 1
    • Views: 3,804
    04-11-2006, 07:54 AM Go to last post
  39. 2 questions: Finding the optimal value of the mean of a standard normal distribution.

    I have two questions involving the Standard Normal Distribution. The first one involves finding the optimal mean, the second one involves proving...

    Started by APOCooter‎, 11-06-2011 03:27 PM
    • Replies: 1
    • Views: 3,069
    11-06-2011, 04:02 PM Go to last post
  40. 2 randomly selected have same birthday

    Please help to answer the following question with detailed steps: What is the probability that two randomly selected people have the same...

    Started by Thakur‎, 01-24-2009 02:32 PM
    • Replies: 2
    • Views: 6,799
    01-24-2009, 06:51 PM Go to last post
  41. 2 statistical bioresearch problems

    Hello guys, I require your help in my research project. Problem 1: We are filtering a suspension of 1ml containing 1250 cells, through a...

    Started by Mandokir‎, 09-21-2012 03:28 AM
    • Replies: 11
    • Views: 2,863
    09-25-2012, 02:54 PM Go to last post
  42. 2012 Presidential Election Probability Calculator

    I'm trying to create a calculator to determine odds of Democrats winning the 2012 US Presidential election. I take the electoral college map from...

    Started by tjc23‎, 07-30-2011 09:44 AM
    • Replies: 2
    • Views: 4,412
    07-31-2011, 02:25 AM Go to last post
  43. 3 Coin Bet

    Please help me with this problem A man has 3 coins as followings: Coin 1: Head Head Coin 2: Tail Tail Coin 3: Head Tail He selects one...

    Started by shangwuvn‎, 03-11-2006 07:11 PM
    • Replies: 3
    • Views: 3,847
    03-11-2006, 09:56 PM Go to last post
  44. 3 Norm Dists (correlated), prob co-occurence of 1% right tail

    Hi, hoping someone can lead me in the right direction.. I'm looking at three normal distributions, specifically looking at the 1% extreme in each...

    Started by CStats‎, 10-20-2009 10:33 PM
    • Replies: 2
    • Views: 2,385
    10-21-2009, 05:15 PM Go to last post
  45. 3D Random Walk

    Okay, so I've got this random walk problem here: (a) Using an appropriate Dirac-delta function, find the probability density w(s) for...

    Started by Callmesomething‎, 04-11-2008 07:54 PM
    • Replies: 1
    • Views: 4,891
    04-12-2008, 11:32 PM Go to last post
  46. 4-alternative forced choice problem

    Hi there, I have the following problem: Participants in my experiment were presented with 4 objects and 4 categories and asked to map each of...

    Started by ClementFerrand‎, 01-29-2013 12:29 PM
    4afc, combinatorics, probability
    • Replies: 2
    • Views: 3,031
    01-29-2013, 12:45 PM Go to last post
  47. 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: 2,422
    03-05-2008, 02:06 PM Go to last post
  48. 5 letter palindrome

    Hello, I need help with these two questions. In a 5 letter word (out of 26): 1) What is the probability that L,E and D won't appear? 2) What...

    Started by Tuvia‎, 11-27-2016 11:00 AM
    palindrome
    • Replies: 1
    • Views: 3,374
    11-27-2016, 01:10 PM Go to last post
  49. 5% uniform random noise

    Can someone describe what 5% uniform random noise is?

    Started by freebird2008‎, 04-06-2009 10:01 AM
    • Replies: 0
    • Views: 2,897
    04-06-2009, 10:01 AM Go to last post
  50. 50-50 or just abusing the game?

    Hi my name is Oscar and I had a question that has been bugging me and some other friends. We cannot wrap our heads around something and we have our...

    Started by otterman‎, 09-22-2012 12:56 AM
    gambling
    • Replies: 9
    • Views: 2,325
    09-25-2012, 02:12 PM Go to last post
  51. 52 card deck

    Ok, I have been trying to solve part d) in my homework for the past hour and then I turned to the web and still couldn't find an answer. This is an...

    Started by madenew‎, 01-27-2013 01:55 AM
    conditional probability, standard deck
    • Replies: 4
    • Views: 2,649
    01-27-2013, 11:52 PM Go to last post
  52. 6 digits number

    we want to create a 6 digits number from the digits 1-5, and to keep the condition that each of the 5 digits, appear at least once. what is the...

    Started by WeeG‎, 05-10-2009 08:54 AM
    • Replies: 0
    • Views: 2,284
    05-10-2009, 08:54 AM Go to last post
  53. 600 hotdogs. homework help

    Not quite sure how to do B or C. Thanks for the help! Jake runs the concession stand for a Chicago area minor league baseball team. He knows that...

    Started by Jhawk‎, 10-21-2014 08:56 PM
    • Replies: 0
    • Views: 1,511
    10-21-2014, 08:56 PM Go to last post
  54. 7 Balls in 7 Buckets

    Hi, Say I have 7 balls I can put in 7 different buckets. Define Xn to be the number of buckets with n balls. For instance X3 = 1 is the number of...

    Started by badmax‎, 07-24-2013 11:10 PM
    • Replies: 0
    • Views: 1,207
    07-24-2013, 11:10 PM Go to last post
  55. 725 Facebook Friends, 6 Birthdays

    I logged into Facebook today to find that 6 of my 725 friends had their birthday today. This number seemed quite high to me. What are the odds of...

    Started by KLaw Squared‎, 08-27-2012 03:29 PM
    • Replies: 1
    • Views: 1,359
    08-27-2012, 03:46 PM Go to last post
  56. 818 Facebook Friends, 0 Birthdays

    Hi all, first time poster here. I am an avid facebooker and like to wish people happy birthdays when they come up. Today, for the first time, I...

    Started by kmac1112‎, 08-21-2012 12:47 PM
    • Replies: 6
    • Views: 2,285
    08-21-2012, 02:09 PM Go to last post
  57. 90 Ball Bingo

    In the traditional game of bingo there are 90 balls and each player gets a card with 15 of those 90 balls on arrange in 3 lines of 5. To match any...

    Started by mwm103‎, 08-15-2011 09:54 AM
    • Replies: 0
    • Views: 2,970
    08-15-2011, 09:54 AM Go to last post
  58. 95% CI is Insignificant, P-Value is Significant

    Suppose you're performing a 2x2 contingency table analysis. You do your Chi Square or Fisher Exact test, as appropriate, then you calculate an odds...

    Started by StatNinja‎, 09-02-2010 01:54 PM
    • Replies: 2
    • Views: 10,513
    09-02-2010, 10:21 PM Go to last post
  59. 97th percentile

    "suppose the moisture content per pound of a dehydrated protein concentrate is normally distributed with a mean of 3.5 and standard deviation of 0.5....

    Started by kelly g‎, 03-26-2012 08:36 PM
    • Replies: 5
    • Views: 8,047
    03-26-2012, 10:34 PM Go to last post
  60. 99% CI for failure proportions

    Hi, Is this working correct for a 99% CI for the difference between two proportions: p(A) = 11 failures out of 200 p(B) = 6 failures out of...

    Started by Silvanus‎, 09-14-2008 08:15 PM
    • Replies: 1
    • Views: 2,703
    09-15-2008, 04:13 AM Go to last post

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