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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: 30,307
    09-30-2005, 09:44 AM Go to last post
  1. Quick Probability Increase Logic Question

    I have 2 events, each increase the overall probability by 20%, events are independent of each other: Original probability 10/100 1st event...

    Started by chorn‎, 06-19-2013 07:23 AM
    • Replies: 1
    • Views: 2,004
    06-21-2013, 11:25 AM Go to last post
  2. overlap integrals for empirical data

    Hi, I have two sets of data each originating from a different probability density function for a continuous stochastic variable (I do not know how...

    Started by choschech‎, 04-13-2010 11:27 AM
    • Replies: 2
    • Views: 4,138
    04-13-2010, 08:13 PM Go to last post
  3. probability & trees

    I have been doing really well in my statistics class but i am stumped with this current problem. He wants us to draw a tree and solve for a few...

    Started by chr1ssy711‎, 10-01-2006 02:10 PM
    • Replies: 7
    • Views: 3,120
    10-01-2006, 03:38 PM Go to last post
  4. family game: how many combinations are possible?

    Hi guys I'm almost getting crazy. We are playing a game in our family and i wanted to demonstrate my son for what probability is useful. Now i am...

    Started by chrigii77‎, 04-06-2015 06:29 AM
    • Replies: 1
    • Views: 1,144
    04-06-2015, 06:44 AM Go to last post
  5. Suggested Book on Probability

    -------------------------------------------------------------------------------- I have never taken a course in probability. My teacher recommended...

    Started by chris ball‎, 05-25-2011 06:07 AM
    • Replies: 2
    • Views: 2,454
    06-06-2011, 03:16 AM Go to last post
  6. Probability exam questions with worked-out solutions

    Students can download from http://personal.vu.nl/h.c.tijms/ExamQuestionsUP.pdf a collection of more than 150 probability exam questions with fully...

    Started by chris ball‎, 04-26-2013 03:53 AM
    • Replies: 0
    • Views: 5,767
    04-26-2013, 03:53 AM Go to last post
  7. Question Probability of a string containing a specific substring

    So I've been getting into concepts like the Library of Babel and infinite monkey theorem, and have been trying to work out how to calculate the...

    Started by Chris Morrow‎, 10-14-2011 07:39 PM
    infinite monkeys, library of babel, recursive functions, substrings
    • Replies: 1
    • Views: 6,677
    01-18-2012, 11:22 AM Go to last post
  8. Question Estimating Conversion Rate When Data is Sparse

    I'm a co-founder of a startup, and am seeking help with a statistical problem. I've been wracking my brains over this, and wondered if any of you...

    Started by chris.b‎, 08-06-2011 08:10 PM
    • Replies: 0
    • Views: 1,963
    08-06-2011, 08:10 PM Go to last post
  9. Frequency of Exceedance, Paired Data, and Cumulative Frequency

    Hello, I am working on an analysis problem that I was hoping folks could provide feedback on. I have a paired timeseries dataset (groups A and...

    Started by Chris009‎, 12-23-2015 05:00 PM
    • Replies: 0
    • Views: 1,117
    12-23-2015, 05:00 PM Go to last post
  10. trading system problem

    if you have a trading system that is right 80% of the time and the risk/reward is 0.8/1 what is the probability of getting to breakeven in 50 trades?...

    Started by chris2006‎, 08-07-2011 03:55 PM
    • Replies: 0
    • Views: 1,515
    08-07-2011, 03:55 PM Go to last post
  11. Normal Distribution

    I am currently working on this problem: Tire compnay produces tires whose diameters are normally distributed, with mean =36 inches and standard...

    Started by chris900‎, 06-03-2008 11:11 AM
    • Replies: 2
    • Views: 1,769
    06-03-2008, 11:48 AM Go to last post
  12. question on standard deviation?

    hi i missed this on the text. does anyone know how to work this problem on a multiple choice test with 11 question each question has 4...

    Started by chrischemma‎, 06-24-2009 07:05 PM
    • Replies: 2
    • Views: 3,760
    06-25-2009, 12:29 AM Go to last post
  13. random variable?

    A graduating senior seeking a job has interviews with two companies. After the interview, he estimates that his chance of getting an offer from the...

    Started by chrischin478‎, 09-03-2008 11:08 PM
    • Replies: 3
    • Views: 3,751
    09-04-2008, 07:10 AM Go to last post
  14. Video game equipment

    Hello everyone, My friend has been playing this game called Tabula Rasa, and is trying to make the perfect armor for his character. In order to do...

    Started by chriscj‎, 05-14-2008 03:15 AM
    • Replies: 5
    • Views: 4,638
    05-30-2008, 12:00 AM Go to last post
  15. 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: 2,967
    10-30-2006, 03:23 PM Go to last post
  16. World Cup - a simple probability question

    Hi All I hope this is not considered too far outside the purpose or spirit of this site! I haven't touched statistics since doing A level...

    Started by chrishayes‎, 06-08-2006 07:07 AM
    • Replies: 2
    • Views: 2,566
    06-21-2006, 10:50 AM Go to last post
  17. Help combining probabilities

    I am a relative novice concerning statistics and probability, and was hoping for some assistance with this problem. I have a substantial database...

    Started by Chrishb‎, 12-22-2010 03:47 AM
    • Replies: 0
    • Views: 2,096
    12-22-2010, 03:47 AM Go to last post
  18. Possion Process Question

    Uploaded with ImageShack.us I attempted this question and I was wondering two things 1) whether the answer is correct 2) and whether the hand...

    Started by chrishello‎, 05-15-2013 12:04 PM
    • Replies: 0
    • Views: 1,062
    05-15-2013, 12:04 PM Go to last post
  19. Stochastic Processes - Probability of r heads in a row before s tails in a row?

    A biased coin is tossed repeatedly, with p the probability of heads on any single toss. Find the probability that there is a run of r heads in a row...

    Started by chrishello‎, 04-17-2013 05:25 AM
    • Replies: 2
    • Views: 2,735
    04-17-2013, 07:57 PM Go to last post
  20. Poisson Process Question (Last)

    Could someone kindly check whether or not my answer is correct to part a of the question. Ive listed the solutionts to part b) which I found on the...

    Started by chrishello‎, 05-15-2013 12:14 PM
    • Replies: 0
    • Views: 1,073
    05-15-2013, 12:14 PM Go to last post
  21. Continuous Local Martingale Question

    I have attempted the following local martingale question. I'm not sure if the proof is correct. If M is in the space of continuous local...

    Started by chrishello‎, 03-25-2014 05:53 PM
    • Replies: 2
    • Views: 1,215
    03-26-2014, 08:30 AM Go to last post
  22. Mice in a maze probability puzzle

    Iíve got a probability puzzle I am trying to solve and was hoping somebody could help. It comes from some chemistry experiments Iím doing, and not...

    Started by chrisj‎, 08-08-2008 11:43 AM
    • Replies: 2
    • Views: 4,960
    08-13-2008, 10:51 AM Go to last post
  23. Binomial question?

    I have this question that I think is binomial probability. Bananas that are almost ripe to pick carry the chance of being 15% rotten. What would be...

    Started by chrismyers1‎, 04-23-2015 09:42 AM
    • Replies: 4
    • Views: 1,627
    07-21-2015, 12:32 PM Go to last post
  24. quest.

    Hi! Not looking for answers, just direction -- don't know what type of probability model to use to se up Q: Quality control inspector for company...

    Started by chrisn‎, 11-01-2005 05:29 PM
    • Replies: 2
    • Views: 3,250
    11-04-2005, 01:49 AM Go to last post
  25. 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: 2,186
    10-08-2013, 10:57 PM Go to last post
  26. Hi, please help me this one Statistic question for test tomorrow?

    1. Subway Sandwiches wishes to introduce a new condiment, carrot, to its sandwiches. To test whether "carrots" will be well-received by its...

    Started by christianivan‎, 12-11-2013 02:07 PM
    • Replies: 1
    • Views: 1,224
    12-12-2013, 02:17 AM Go to last post
  27. I'm curious...

    I was just looking over an old exam, and I came across a problem with T scores. I know how to work with z scores, but I'm confused with T scores. I...

    Started by Christy‎, 09-13-2006 08:23 PM
    • Replies: 1
    • Views: 2,291
    09-13-2006, 08:35 PM Go to last post
  28. Combining random variables, squared

    Been sitting with this for a while, and hoping wome of you can assist me. I'm given a pdf f(y) = 6y(1-y) for 0<y<1, and I want to calculate the pdf...

    Started by Chub‎, 03-11-2010 07:00 AM
    • Replies: 2
    • Views: 6,284
    03-11-2010, 12:45 PM Go to last post
  29. positions of letters in texts (coincidence?)

    Hi everyone. Please excuse this stupid question but here it is anyway: What are the chances of the following occourring in a book? On page...

    Started by chukabuka‎, 01-23-2009 06:44 PM
    • Replies: 2
    • Views: 2,523
    01-28-2009, 07:39 AM Go to last post
  30. Probability of hitting a certain number

    Random numbers between 5 and 18 are continually added to increase a sum, starting at zero, what is the probability that you will hit the number 72?

    Started by cid902‎, 10-21-2007 12:22 AM
    • Replies: 5
    • Views: 2,421
    10-21-2007, 09:55 PM Go to last post
  31. Analyzing test results- Normal Distribution

    Iím trying to compare my grade on my Algebra exam to my fellow students using the normal distribution. Here are the results of the exam: ...

    Started by ciddis‎, 06-20-2006 10:02 AM
    • Replies: 0
    • Views: 5,729
    06-20-2006, 10:02 AM Go to last post
  32. Test Score Probability

    Iím trying to compare my grade on my Algebra exam to my fellow students using the normal distribution. Here are the results of the exam: ...

    Started by ciddis‎, 09-14-2006 09:12 AM
    • Replies: 1
    • Views: 6,107
    09-14-2006, 01:00 PM Go to last post
  33. Poisson Mean

    Hello Everyone, Im not sure if i posted at the right section if not im extending my apologies in advance. Ive been reading this network...

    Started by cincity‎, 05-19-2008 12:24 AM
    • Replies: 0
    • Views: 2,204
    05-19-2008, 12:24 AM Go to last post
  34. Exclamation Normal Distribution Problem

    Hi, I've been working on this problem for a while now and keep getting stuck. The problem says, The length of time before a cell phone using a...

    Started by Cinny_72‎, 04-25-2007 04:24 PM
    • Replies: 1
    • Views: 4,449
    07-03-2007, 01:37 PM Go to last post
  35. Generate Random Correlated Variable

    I have established a correlation between independent X and dependent Y. Is there a formula for generating a random Y from a particular X? For...

    Started by cisaak‎, 01-15-2012 11:18 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 15,284
    06-29-2012, 09:43 AM Go to last post
  36. Confidence Help

    I am trying to make some observations from a data set of independent and dependent variables. Using its S and AD Test statistic, the set of natural...

    Started by cisaak‎, 07-25-2012 01:40 PM
    • Replies: 0
    • Views: 1,098
    07-25-2012, 01:40 PM Go to last post
  37. Prediction & Autocorrelation

    I have a set of dependent variables which are serially correlated. I understand the confidence and prediction intervals are actually much broader...

    Started by cisaak‎, 08-07-2012 11:18 AM
    • Replies: 0
    • Views: 1,631
    08-07-2012, 11:18 AM Go to last post
  38. z standard normal

    First part of the question asks..if X is normal with mean = 8.48 and sd = 1.6, what are the 2 values of X which include central 80% of probability? ...

    Started by citibankak‎, 04-11-2008 12:21 AM
    • Replies: 1
    • Views: 5,491
    04-11-2008, 07:18 AM Go to last post
  39. probability help!

    mean = $1530 sd = $120 Bookstore must sell at least $1200 in sales to break even. What is the probabily that on a given day the bookstore will...

    Started by citibankak‎, 04-11-2008 12:22 AM
    • Replies: 1
    • Views: 2,107
    04-11-2008, 07:12 AM Go to last post
  40. Will someone please help a lost Engineer?

    I am trying to finish my thesis for my Masters in Civil Engineering and have run into a statistics/ probability question which my one Engineering...

    Started by Civil Eng.‎, 02-05-2009 12:20 AM
    • Replies: 6
    • Views: 2,768
    02-05-2009, 06:45 PM Go to last post
  41. Post Probability Homework

    I have a probability question that I have no idea where to start. It is probably simple but I don't have any idea where to start. I was thinking it...

    Started by cjb‎, 09-13-2009 10:52 PM
    • Replies: 0
    • Views: 2,797
    09-13-2009, 10:52 PM Go to last post
  42. Branching process question

    Hi I have attached my question, I needed help on part ii). I don't know how compute P(N=n) Thanks

    Started by cjones‎, 05-17-2012 09:34 AM
    • Replies: 1
    • Views: 2,018
    05-18-2012, 12:52 AM Go to last post
  43. Permutation or Combination? Who knows? How to know?

    I think I have a decent understanding of the difference btwn permuation and combination. But occasionally a word problem comes up that throws me a...

    Started by ckbeme‎, 04-16-2006 04:51 AM
    • Replies: 2
    • Views: 6,127
    04-18-2006, 04:35 PM Go to last post
  44. Prob w/Combination of At Least AND Combination

    I'm stuck on this. I've had similar probs, but none that combine the At Least with this type of selection. I really hate to ask for help on a...

    Started by ckbeme‎, 04-21-2006 05:40 PM
    • Replies: 5
    • Views: 10,436
    04-23-2006, 08:38 AM Go to last post
  45. Smile Probability question making my brain hurt :p

    "suppose you know that a friend of yours has two children and that at least one of them is a boy. One day, you visit your friend's house and his son...

    Started by clairethackray‎, 03-17-2014 11:14 PM
    • Replies: 1
    • Views: 10,144
    03-18-2014, 03:22 AM Go to last post
  46. Probability and coincidences help

    Can someone please help in the breakdown of how I do this question I am completely lost and I am not sure how to even word the answers ...

    Started by clarence85‎, 03-22-2014 01:51 AM
    coincidences, probability help, probability homework help
    • Replies: 0
    • Views: 935
    03-22-2014, 01:51 AM Go to last post
  47. 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: 2,826
    01-29-2013, 12:45 PM Go to last post
  48. Raffle with many entries per person, many prizes, limit one prize per person

    Consider a raffle for which each person may buy any number of tickets. There are many prizes but each each person may only win one prize. What is the...

    Started by clint.t.graham‎, 01-17-2012 06:03 PM
    contest, multiple, prize, raffle
    • Replies: 2
    • Views: 7,563
    01-19-2012, 01:55 PM Go to last post
  49. how many degrees of freedom do I need to make a Root Sum Square valid?

    If I have two errors, that seems on the low end for using RSS. If I have a hundred, I feel pretty comfortable. I'm having trouble finding math...

    Started by cloughna‎, 01-17-2011 03:43 PM
    • Replies: 0
    • Views: 4,606
    01-17-2011, 03:43 PM Go to last post
  50. Expectation of truncated normal X conditional on truncated normal Y

    I am trying to derive: E(X|a \leq Y \leq b) where c \leq X \leq d , X and Y are (doubly truncated) Gaussians with the same mean and different...

    Started by CLP_PS‎, 07-27-2015 06:35 PM
    • Replies: 2
    • Views: 2,126
    07-28-2015, 10:37 AM Go to last post
  51. Red face Probability Question (Ambiguous)

    SOLVED BY MYSELF, YOU CAN CLOSE THE THREAD :) Hi guys, I'm new to this forum, and some of you might find it annoying that I post a question...

    Started by cluborange‎, 10-24-2013 04:28 PM
    conditional probability, homework, probability, question
    • Replies: 1
    • Views: 1,510
    10-24-2013, 05:02 PM Go to last post
  52. Smile Bayesian Approach To Combine Multiple Weighted Inputs

    I'm beginning to learn about Bayesian theory but I'm stumped on the ideal approach for combining multiple weighted inputs. Here's an example to make...

    Started by cmarin‎, 05-07-2016 06:16 PM
    bayesian inference
    • Replies: 2
    • Views: 1,196
    05-08-2016, 10:59 AM Go to last post
  53. r-value > Probability

    I have two wrestlers who are going to arm-wrestle. I want to try to predict who will win based on their previous fights against other opponents....

    Started by cmarkc‎, 08-19-2011 08:37 AM
    • Replies: 14
    • Views: 7,047
    08-24-2011, 06:14 AM Go to last post
  54. Easy Probability Question

    Hi. I have an easy probability question. If you flip a coin 50 times, what is the probability of getting 70% heads? Sorry this is so easy,...

    Started by cmarkos111‎, 11-04-2010 01:54 PM
    • Replies: 7
    • Views: 2,890
    11-04-2010, 05:05 PM Go to last post
  55. Simple Probability Question

    Hi. I have a simple probability question: Not counting the greens, what are the odds of getting 19 of the same color in a row in roulette? ...

    Started by cmarkos111‎, 12-01-2010 06:21 PM
    • Replies: 7
    • Views: 3,414
    12-02-2010, 12:44 PM Go to last post
  56. Equity Trading Probability Question

    Hi Talk Stats, I'm an equity trader who is testing a new strategy. So far, we have succeeded on 72 of 103 trades, or a success rate of 69.90%. ...

    Started by cmarkos111‎, 02-03-2011 03:34 PM
    • Replies: 2
    • Views: 2,282
    02-03-2011, 04:06 PM Go to last post
  57. What minimum sample size should relfect the distribution of the overall population

    If I have exam grades for a large population (2500), what is the minimum sample/class size for which I can expect the distribution of grades for the...

    Started by cmccandless‎, 02-16-2009 01:05 PM
    • Replies: 0
    • Views: 3,556
    02-16-2009, 01:05 PM Go to last post
  58. Ztable probability, Please Help

    Im looking back over an old assignment and I cant figure out how to get the correct probability Question: what is the probability of encountering...

    Started by cmf0106‎, 10-26-2008 02:14 PM
    • Replies: 3
    • Views: 2,256
    10-26-2008, 02:37 PM Go to last post
  59. binomial distribution

    A "thinking" question I need help with regarding binomial distributions and I have no clue what they mean. Please help!! I can do the problems O.K....

    Started by cmojito‎, 12-29-2007 10:36 PM
    • Replies: 0
    • Views: 3,812
    12-29-2007, 10:36 PM Go to last post
  60. Binary Bootstrap

    Is it valid to use a bootstrap technique for estimating variance in a binary (yes/no or 1/0) data set? My motivation for doing so is to perform...

    Started by cmonke‎, 08-15-2009 02:57 PM
    • Replies: 5
    • Views: 7,406
    09-29-2009, 04:01 AM Go to last post

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