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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: 30,330
    09-30-2005, 09:44 AM Go to last post
  1. The Gamblers Fallacy and Regression to the Mean

    Hi, so first time posting and all. I'm not a statistician by degree or trade (actually an engineer), so a little confused by something, and was...

    Started by Mr Ben‎, 11-16-2011 05:17 PM
    • Replies: 5
    • Views: 9,347
    10-10-2013, 02:27 PM Go to last post
  2. Complex probability relating to NYC taxi cabs

    There are 13,000 taxi cabs in New York City. Let's say I have taken 600 rides (each one in a random cab). What are the chances that I have...

    Started by mattcaps‎, 06-04-2013 09:57 PM
    • Replies: 5
    • Views: 2,322
    12-30-2013, 10:21 AM Go to last post
  3. Probability of deviation in sample proportion

    Hi! Iím very new to statistics and Iím stuck on what formula to use for an assignment. I have the information that 32.19 % of my population is...

    Started by Krapula‎, 10-18-2013 06:31 AM
    • Replies: 5
    • Views: 1,819
    10-19-2013, 01:49 PM Go to last post
  4. How to find the probability of a podium finish

    Say in a race there are 22 competitors and say that the probability of driver A of winning the race is 55%. How can one calculate the probability of...

    Started by christian.falzom‎, 10-08-2013 03:43 PM
    • Replies: 5
    • Views: 2,190
    10-08-2013, 10:57 PM Go to last post
  5. Probability and standard deviation

    Dear Members, I am struggling with this particular problem and I am not sure about my answers. If anybody could verify them that would be of great...

    Started by krspatgaon‎, 10-25-2013 01:11 AM
    • Replies: 5
    • Views: 4,234
    11-25-2013, 12:10 AM Go to last post
  6. Coin Toss

    Hi, There are three people, A, B ,C, tossing a coin. The first one to get heads wins, they toss in succession in the order ABC, show the...

    Started by plm‎, 11-17-2013 10:06 AM
    • Replies: 5
    • Views: 2,339
    11-17-2013, 11:54 AM Go to last post
  7. Amateur has a question please

    My wife and I have been married for 30 years. During all this time neither my wife, nor her father (my father-in-law), have had an auto accident. We...

    Started by Forensics1‎, 10-30-2013 08:36 PM
    • Replies: 5
    • Views: 1,929
    11-02-2013, 08:54 PM Go to last post
  8. (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: 2,129
    02-05-2014, 03:48 PM Go to last post
  9. Number of trials in zero-sum game

    Hi all, this is my first post here! Forgive me if it's not in the right place. I have a question that's been bugging me because I tend to be...

    Started by SR_87‎, 02-11-2014 05:46 AM
    • Replies: 5
    • Views: 2,029
    03-14-2014, 08:20 AM Go to last post
  10. Probability question

    I need a probability question answering as soon as possible and i though this might be the place to come. There are 13 balls in a hat being...

    Started by ab1234‎, 03-02-2014 07:33 PM
    hypergeometric, urn
    • Replies: 5
    • Views: 1,894
    03-02-2014, 11:36 PM Go to last post
  11. Coin Flip and calling randomly

    If there is a coin flip contest and there is a coin flipper continuously flipping the coin and there are three contestants 1. Always Calls Heads...

    Started by codenamenikky‎, 03-07-2014 05:06 PM
    basic probability, coin flips
    • Replies: 5
    • Views: 1,605
    03-10-2014, 08:47 AM Go to last post
  12. First stats course. need help with this problem

    a tree stand has 12 douglas firs, 10 maples, 3 hemlocks, and 7 cedars. if you randomly select 6 trees, what is the probability that at least 2 of...

    Started by pearza‎, 03-10-2014 11:08 PM
    • Replies: 5
    • Views: 2,268
    03-11-2014, 02:10 PM Go to last post
  13. 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: 1,599
    04-09-2014, 07:50 AM Go to last post
  14. Conditional Probability?

    What is the probability on a single roll of a pair of dice, that the sum is 6, given that at least one die came up 1? I'm thinking that there are...

    Started by mathprof‎, 04-12-2014 07:45 PM
    conditional probability, dice
    • Replies: 5
    • Views: 1,680
    04-12-2014, 11:20 PM Go to last post
  15. Probability of a sequence....

    HI Folks, New to the forum. It's nice to find a forum in this area. I hope someone can help me out. My goal is to determine if it is possible to...

    Started by MikCss‎, 05-29-2014 07:44 AM
    • Replies: 5
    • Views: 2,488
    07-12-2014, 06:41 PM Go to last post
  16. Question Logistic Regression Problem

    Hi! My collegue is developing a logistic regression to predict the probability of a customer taking up a particular credit card. Let's call...

    Started by rbenzoj‎, 07-22-2014 01:19 PM
    correlation, logistic regression
    • Replies: 5
    • Views: 2,233
    07-28-2014, 09:57 AM Go to last post
  17. Question Probability that Bernoulli p-parameter is greater than some value, given N samples?

    Hello everybody, I have the following question. Assume I observe N outcomes from a Bernoulli random variable with unknown success parameter p....

    Started by hansel‎, 08-11-2014 05:18 PM
    bernoulli, confidence intervals, parameter estimation
    • Replies: 5
    • Views: 2,348
    08-14-2014, 01:52 PM Go to last post
  18. changing the frequency distribution with out the changing the shape of the disti

    i have frequency table of wind speeds from a measurement site and now i want to use that wind speed frequency table to find out wind speed at a...

    Started by codenamenikky‎, 08-15-2014 01:24 PM
    • Replies: 5
    • Views: 2,165
    08-25-2014, 05:28 PM Go to last post
  19. probability poisson distributed

    hi can somebody help me with this question please.

    Started by arkeed178‎, 08-29-2014 06:52 AM
    • Replies: 5
    • Views: 2,161
    09-01-2014, 10:25 AM Go to last post
  20. Question Binominal Distribution (urgent)

    kindly help (or provide hints) on below question: Suppose that you pay $1024 to enter a coin tossing game. A biased coin with head probability...

    Started by lkwokchu‎, 10-12-2014 06:11 AM
    • Replies: 5
    • Views: 2,397
    10-16-2014, 12:48 AM Go to last post
  21. Secret santa problem

    Hi everybody At my work we just started a secret santa game. We are 6 and we ended up getting an outsider to mix 6 pieces of paper, each with one...

    Started by Hugosson‎, 11-27-2014 11:06 AM
    • Replies: 5
    • Views: 2,253
    11-28-2014, 06:26 PM Go to last post
  22. 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: 2,195
    01-06-2015, 01:17 PM Go to last post
  23. Question Confidence Intervals

    Hi I am new to stats and really spending lots of time on concepts which I can build on, I thought I was fairly comfortable with confidence...

    Started by Golf39‎, 12-16-2014 05:53 AM
    • Replies: 5
    • Views: 2,559
    12-19-2014, 03:12 AM Go to last post
  24. 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: 1,554
    02-03-2015, 09:35 AM Go to last post
  25. 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: 1,855
    02-05-2015, 01:39 PM Go to last post
  26. Post Binomial Distribution Question

    Hey guys, I have a bit of trouble understanding this binomial distribution question According to the call center statistics of a company, on...

    Started by Bill_McCoy‎, 03-05-2015 05:27 AM
    • Replies: 5
    • Views: 1,879
    03-05-2015, 10:43 AM Go to last post
  27. Question Thumbs Up or Down on my logic

    Very rusty on my statistics and will appreciate validation or correction on my thinking. "Fair" playing field - 88 players (18 in red shirts, 70...

    Started by hAltonJones‎, 03-21-2015 12:12 PM
    basic probability, newbie, probability
    • Replies: 5
    • Views: 1,547
    03-21-2015, 02:30 PM Go to last post
  28. Exercises with answers

    Hello probabilitygeniuses I am very new to probabilities and would like to ask if there are online resources with loads of probability...

    Started by molly‎, 04-15-2015 09:29 AM
    • Replies: 5
    • Views: 2,416
    04-26-2015, 09:29 AM Go to last post
  29. probability of 8 successes out of 256 events

    Hi all hope you are well, i was trying to calculate what the probability of getting exactly 8 successes in 256 events. I used a Binomial on line...

    Started by censura‎, 05-21-2015 02:44 AM
    • Replies: 5
    • Views: 1,511
    05-25-2015, 06:12 AM Go to last post
  30. Newbie here, would appreciate some help.

    Hey guys. First post here and it's a bit basic so sorry about that. I have created an analogy to the problem I have. Say I have 8 balls, 4 of...

    Started by Everybody's fool‎, 08-26-2015 02:05 PM
    • Replies: 5
    • Views: 1,991
    08-27-2015, 02:15 PM Go to last post
  31. Determine distribution and parameters

    I have a question but maybe it's the wrong question so I'll state the task first... I want to make data that looks like the data I'm working with...

    Started by trinker‎, 09-21-2015 03:02 PM
    data generation, distribution
    • Replies: 5
    • Views: 1,598
    09-21-2015, 09:13 PM Go to last post
  32. Conditional Probability

    http://i.imgur.com/9UELFY5.png Here is the problem in question. I have the answers for both of these already,but I am not sure I have 2b correct. ...

    Started by StatScareMe‎, 12-14-2015 04:09 PM
    • Replies: 5
    • Views: 1,198
    12-14-2015, 05:18 PM Go to last post
  33. Assistance with Monte Carlo Method for Board GAme

    Outcomes 16 cards. The cards have up to four values. I need assistance building a data set I can analyze. Simulating a starting hand, and...

    Started by Butlertom‎, 01-25-2016 08:18 PM
    • Replies: 5
    • Views: 1,898
    01-27-2016, 06:58 PM Go to last post
  34. Best To Draw First Or Last?

    Hi, newbie non mathematician looking for an answer to a long debated question in angling. When fishing a competition we draw a random number (say...

    Started by Neil of the Nene‎, 01-19-2016 05:47 AM
    • Replies: 5
    • Views: 2,006
    01-20-2016, 01:46 PM Go to last post
  35. How to calculate the odds that Team A will beat Team B given their records to date?

    I would like to find a formula to calculate the probability that Team A will beat Team B taking into account just their records to date. For...

    Started by Jennifer Murphy‎, 02-20-2016 01:05 AM
    • Replies: 5
    • Views: 3,511
    02-23-2016, 02:16 PM Go to last post
  36. Probability question

    Let's say we have 60 balls of which 17 are red and the rest black. If I pick 7 balls at random, what is the probability that i picked at least 3 red...

    Started by spisi‎, 02-23-2016 07:03 PM
    • Replies: 5
    • Views: 1,394
    02-25-2016, 02:32 PM Go to last post
  37. Probability of opposite of mean

    I am trying to calculate the probability of reverse preferences for an outcome. I have the mean and standard deviation of the predicted outcome, how...

    Started by Puffin‎, 03-02-2016 08:52 AM
    • Replies: 5
    • Views: 1,889
    03-03-2016, 07:12 AM Go to last post
  38. Question Manufacturing machine probability problem

    There are three possible environment conditions: normal, rainy and hot. Rainy and hot days may be risky to a system that has been deployed, but...

    Started by deathlives‎, 03-04-2016 10:36 PM
    exam, probability, random
    • Replies: 5
    • Views: 3,262
    03-06-2016, 02:29 AM Go to last post
  39. Show, by calculation, that the mean of y doesn't exist

    This is one of my questions for my homework, I have attached a copy of the function and also my attempt, I'm not sure if I've done it right. And if I...

    Started by k.dot‎, 03-20-2016 07:08 AM
    • Replies: 5
    • Views: 1,557
    03-21-2016, 07:35 PM Go to last post
  40. Probability Problem - Random variable

    A company wants to improve waste management in its premises . We put a yellow bin for recovering recyclable materials , a brown to recover...

    Started by lalous‎, 05-25-2016 01:03 AM
    • Replies: 5
    • Views: 1,437
    05-26-2016, 01:41 AM Go to last post
  41. Paper Notes in a Bag

    Hello all, I have this problem, which I am not fully sure how to solve: In a bag there are 18 paper notes. On five of them there is the digit...

    Started by Yankel‎, 06-15-2016 12:31 AM
    • Replies: 5
    • Views: 1,347
    06-15-2016, 06:47 AM Go to last post
  42. Calculating Probabilities

    If a mechanical fault in a car occurs once in every 120 days, and I drive the car 260 days per year, what is the probability of a mechanical fault...

    Started by Rab1‎, 07-09-2016 06:23 AM
    • Replies: 5
    • Views: 1,120
    07-20-2016, 12:59 PM Go to last post
  43. Probability of an attribute in one member of a population

    Wondering whether the following can be calculated (or whether more info is needed). Here's the population: A - 224,000,000 (72.5%) B - ...

    Started by hazelvision‎, 09-27-2016 10:21 PM
    • Replies: 5
    • Views: 2,231
    09-28-2016, 04:03 PM Go to last post
  44. Help please on calculating probabilities of certain coin-flip outcomes

    Hi all, (Note: this is not a request for help with "homework"; I'm 51 years old and am trying to learn on my own, through my own "assignments" to...

    Started by lingyai‎, 04-26-2017 12:19 PM
    • Replies: 5
    • Views: 1,185
    04-28-2017, 06:10 PM Go to last post
  45. Union and intersection

    43% of adults are stockholders. 75% of adult stockholders have some college education. 37% of adults have some college education. An adult is...

    Started by Regulus‎, 03-14-2017 10:06 PM
    • Replies: 5
    • Views: 1,950
    03-18-2017, 06:05 PM Go to last post
  46. Exclamation Probability of developing a lung cancer disease

    I need to solve this problem: A cohort study is done to assess the impact of smoking on lung cancer. In this study, a large representative sample...

    Started by aptremblay‎, 03-01-2017 03:46 PM
    probability, probability homework help, statistics, statistics problems
    • Replies: 5
    • Views: 2,073
    03-01-2017, 06:30 PM Go to last post
  47. Card drawing probability

    Hey all, I have been pondering about a problem in excel and cant seem to figure it out :/ Lets assume I have a card deck of 50 cards. My opening...

    Started by CameronNY‎, 02-20-2017 03:29 PM
    • Replies: 5
    • Views: 1,500
    02-21-2017, 02:47 AM Go to last post
  48. Gambler's ruin problem - modified

    Hi there, I'm a probability newbie. Can anyone help me with the following problem? A player begins with £1 and each round they can wager £1 on...

    Started by federico.zampini‎, 02-01-2017 12:01 PM
    • Replies: 5
    • Views: 2,875
    02-02-2017, 11:48 AM Go to last post
  49. Bayesian exercise

    -2 down vote favorite I cant get my head round the following exercise: You are testing dice for a casino to make sure that sixes do not come up...

    Started by randomrun‎, 01-18-2017 09:00 AM
    bayes, bayesian inference, probability
    • Replies: 5
    • Views: 3,175
    01-18-2017, 01:56 PM Go to last post
  50. MGF of sample mean of IID poisson RVs

    I am given the MGF of IID RVs as e^{\lambda(e^t-1)} and am supposed to find the MGF of their sample mean of n such RVs. I have am arriving at ...

    Started by nsus‎, 02-12-2017 11:02 AM
    mgf, sample mean
    • Replies: 5
    • Views: 2,752
    02-14-2017, 08:26 PM Go to last post
  51. Help with Confidence Intervals

    The questions regarding confidence intervals and population means are hard to understand: Please help me set them up in a formula and solve. #3 ...

    Started by Rugrats3‎, 09-25-2005 04:12 PM
    • Replies: 4
    • Views: 6,327
    09-26-2005, 10:01 AM Go to last post
  52. Exclamation I need help please!!!

    A mail order company receives an average of five orders per 500 solicitations. If it sends out 100 advertisements, find the probability of receiving...

    Started by carebear70417‎, 10-09-2005 08:33 PM
    • Replies: 4
    • Views: 9,978
    10-09-2005, 08:51 PM Go to last post
  53. can you help with this as well!?

    Suppose that 20% of all subscribers to a business magazine earn an income greater than $100,000. If the magazine takes a random sample of 20...

    Started by statsdud‎, 11-02-2005 05:01 PM
    • Replies: 4
    • Views: 3,230
    11-03-2005, 03:15 PM Go to last post
  54. in the movies

    can someone help me!!!!! i've been stuck in this problem for hours now!!! ack!!!! heeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeelp meeeeeeeeeeeeeeeeeeeeeeee...

    Started by HemlyFan‎, 11-09-2005 07:05 PM
    • Replies: 4
    • Views: 3,806
    11-11-2005, 04:53 PM Go to last post
  55. Hi I need help w/ sampling distribution.

    HI, I'm taking statistics and i was trying to solve a problem, but I couldn't solve it. I was wondering if you could help me out. Here's the...

    Started by Michelle‎, 11-11-2005 05:19 PM
    • Replies: 4
    • Views: 4,605
    11-11-2005, 07:49 PM Go to last post
  56. Unhappy Help!

    I'm working on this problem and I am completely lost. There there anyone out there that can help me. I see the problem worked out in the book, but...

    Started by Stacy Jones‎, 12-02-2005 01:18 PM
    • Replies: 4
    • Views: 3,582
    12-02-2005, 03:49 PM Go to last post
  57. Help with normal distribution! (please!)

    Hi, I'm looking through some past papers for an exam I have this weekend and have come across this strange binomial distribution question, that's...

    Started by StevenX‎, 12-06-2005 11:27 AM
    • Replies: 4
    • Views: 3,620
    12-06-2005, 03:00 PM Go to last post
  58. Probability question

    Here is the problem: To get to work, a commuter must cross train tracks. The time the train arrives varies slightly from day to day , but the...

    Started by AlexKom‎, 12-13-2005 09:09 PM
    • Replies: 4
    • Views: 9,633
    12-15-2005, 11:13 AM Go to last post
  59. Am I on the right track for this one?

    The height of people in a certain population is approx. normally distributed with a mean of 67 inches and a standard deviation of 3.4 inches....

    Started by karen c‎, 02-07-2006 11:56 PM
    • Replies: 4
    • Views: 2,741
    02-08-2006, 12:59 AM Go to last post
  60. Question Bidding question - (Uniform Probability Distribution)

    Suppose you are interested in bidding on a piece of land and we know one other bidder is interested. The seller announced that the highest bid in...

    Started by Parillamaster‎, 02-14-2006 10:40 AM
    • Replies: 4
    • Views: 19,074
    02-14-2006, 12:26 PM Go to last post

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