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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: 30,184
    09-30-2005, 09:44 AM Go to last post
  1. Cominatorics Question ~ How many equations can be written with n variables?

    Hi everyone, currently I am doing a thesis paper. I have currently 7 variables I need to write in terms of the others to satisfy some homogeneity...

    Started by dannylimstata‎, 04-20-2012 02:56 PM
    • Replies: 2
    • Views: 1,715
    04-20-2012, 03:21 PM Go to last post
  2. gambling probability

    Hi guys, hope someone can help... I would like to find out what the probability is of recieving a 2 or a 3 card '21' score from a single deck of...

    Started by Danson‎, 01-16-2012 06:02 AM
    • Replies: 1
    • Views: 1,967
    01-16-2012, 06:57 AM Go to last post
  3. Exercise, Poisson process

    This is an exercise from the book, Introduction to Probability Models by Sheldon M. Ross. Problem: A scientific theory supposes that mistakes in...

    Started by dante‎, 04-06-2013 12:05 PM
    • Replies: 0
    • Views: 2,904
    04-06-2013, 12:05 PM Go to last post
  4. Two part PMF for a Joint Distribution problem

    Suppose X and Y have the following joint distribution p(x, y) = c(x^2 + y^2). For x = -1, 0, 1, 3 and y = -1, 2, 4: A) Find the value of c that...

    Started by Dantevus‎, 12-08-2010 09:12 AM
    • Replies: 2
    • Views: 5,788
    12-08-2010, 10:26 AM Go to last post
  5. exponential distribution probability help

    This is a modified version of one of my homework questions. Please help me out, and show your work so I know how to calculate it myself. The only...

    Started by danthegolfer‎, 10-25-2009 06:45 PM
    • Replies: 3
    • Views: 5,137
    10-26-2009, 11:21 PM Go to last post
  6. probability of payouts

    Hi and thanks for looking at this. We have a client who is donating 10% of pet ecommerce profits to shelters. We are building an online slot...

    Started by darbo‎, 09-15-2009 11:13 AM
    • Replies: 0
    • Views: 2,220
    09-15-2009, 11:13 AM Go to last post
  7. Sample size influence on the mean for non-normal distributions?

    Hi, I'm not a statistician so sorry if this is dumb. I am making non-linear (neural networks) models and my errors are not supposed to be normal,...

    Started by darfunkel‎, 02-20-2011 03:49 PM
    • Replies: 1
    • Views: 4,004
    02-22-2011, 03:56 AM Go to last post
  8. Example of PDF with correlation of a specific value

    For example example of a pdf or pmf with correlation . It is obviously easy to find ones with 0,1,-1. But what would be a good general way to...

    Started by darkdream‎, 11-11-2013 05:21 PM
    • Replies: 2
    • Views: 2,361
    11-11-2013, 10:56 PM Go to last post
  9. pdf minimum of two r.v

    Suppose we have a pdf f(x,y) = (1/15) for 0 < x < 3 and 0 < y < 5 we want to calculate the pdf of K = min(x,y) for 3<k< 5, => either x or y =...

    Started by darkdream‎, 11-11-2013 05:31 PM
    • Replies: 1
    • Views: 1,139
    11-11-2013, 05:52 PM Go to last post
  10. Application of the unconscious statistician

    A random variable Y is normal with mean u and variance s^2. Given that g(y) =exp(2y) , using a taylor series expansion around u to approximate E and...

    Started by darkdream‎, 02-07-2014 11:09 PM
    • Replies: 1
    • Views: 1,750
    02-08-2014, 10:18 PM Go to last post
  11. Thumbs up finding e10 need help lost

    Given the sample space S={e1, e2, e3, …, e10}, where P(e1)=P(e3)=P(e5)=P(e7)=P(e8)=P(e9)=0.1 and P(e2)=0.05, P(e4)=0.12, p(e6)=0.14. Consider the...

    Started by darktek‎, 02-11-2008 01:16 AM
    • Replies: 0
    • Views: 2,299
    02-11-2008, 01:16 AM Go to last post
  12. Probabilty question

    I am trying to figure this problem out. I know it seems simple, but for some reason I am having a hard time with this. Can someone show me how to...

    Started by darktiger‎, 09-18-2006 08:15 PM
    • Replies: 1
    • Views: 3,025
    09-18-2006, 08:40 PM Go to last post
  13. Probability Density Function

    Hello guys I just want my work to be reviewed on this exercise please :) Consider X a random variable with pdf f X (x) = (3/8) * (1-x)^2 if...

    Started by Darktranquillity‎, 12-04-2011 06:30 PM
    • Replies: 4
    • Views: 2,650
    12-05-2011, 11:04 AM Go to last post
  14. Probability Distribution Function

    Hello guys hope you are good, I have a final question. Suppose that the r.v X represents the radius of a ball and that X has probability...

    Started by Darktranquillity‎, 12-05-2011 11:21 AM
    • Replies: 6
    • Views: 2,276
    12-05-2011, 12:28 PM Go to last post
  15. Moment Generating Function

    If the joint moment generating function of X and Y is M X,Y (t1, t2) = 6 / (1-t1) * and X,Y are the times that required for two tasks to be...

    Started by Darktranquillity‎, 02-22-2012 02:26 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 5,678
    02-23-2012, 01:13 PM Go to last post
  16. Branching Process

    I attach the following question about branching processes. Any hints/help on how to proceed with my proof would be greatly appreciated! Regards

    Started by Darktranquillity‎, 03-26-2012 07:03 AM
    • Replies: 0
    • Views: 1,388
    03-26-2012, 07:03 AM Go to last post
  17. I'm very confused...(Normal Distribution)

    Hi people...I really should of come here sooner to try and ask for help, but I just kept letting myself sink deeper and deeper... Now I have some...

    Started by DarrenCax‎, 11-20-2006 02:30 AM
    • Replies: 4
    • Views: 3,149
    11-21-2006, 11:14 PM Go to last post
  18. How to do cumulative confidences from child objects to a parent object?

    Hi I need some help with cumulative confidences. For example. I have 5 shops, each forecasting to sell x number of TABLET PCs by the end of the...

    Started by Darshik‎, 02-28-2013 08:05 AM
    aggregating confidences, cumulative confidences
    • Replies: 4
    • Views: 1,239
    03-01-2013, 12:17 AM Go to last post
  19. Mann-Whitney U Test

    Hello everyone, Thank you all for providing and maintaining this forum. I'm currently working with two data sets collected ten months apart,...

    Started by Dash‎, 02-02-2016 07:59 AM
    • Replies: 3
    • Views: 1,102
    02-02-2016, 04:27 PM Go to last post
  20. Interesting ways to generate a random normal deviate

    I was thinking of ways to generate a random normal observation from a single random uniform(0,1) observation. I have at least 3 interesting ways in...

    Started by Dason‎, 02-03-2012 02:04 AM
    • Replies: 1
    • Views: 2,128
    09-15-2012, 02:41 AM Go to last post
  21. Is this right?

    I'm doing a research paper in international relations and I need some help describing the data. For example, in 13 interventions in civil wars, I...

    Started by datorres85‎, 06-28-2016 08:38 PM
    • Replies: 1
    • Views: 1,221
    06-30-2016, 02:31 PM Go to last post
  22. 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: 5,288
    03-14-2009, 01:38 PM Go to last post
  23. Probabilities associated with simple events

    An experiment can result in one of five equally likely simple events, E1, E2..... E5. Events A, B and C are defined as follows. A: E1, E3 ...

    Started by dave08‎, 10-05-2013 08:50 AM
    • Replies: 0
    • Views: 1,622
    10-05-2013, 08:50 AM Go to last post
  24. correct update of bayesian posteriors

    the question looks a bit artificial but I simply tried to get rid of useless details. There are two persons, A, and B. they each got a number, a...

    Started by David Pekker‎, 11-12-2015 12:29 PM
    • Replies: 1
    • Views: 1,260
    11-12-2015, 11:58 PM Go to last post
  25. question regarding distribution mean (app Crystal Ball)

    Hi everyone, I have a question that I have come across running some Crystal Ball simulations however, I think the problem is rather a generic...

    Started by david.‎, 11-11-2011 04:39 AM
    • Replies: 1
    • Views: 2,411
    11-11-2011, 05:27 AM Go to last post
  26. Definition of (objective) Probability

    There are two definition as far as I know (not including subjective probability), and each one has its problems: 1. If O is the set of all equally...

    Started by David1‎, 01-21-2012 06:32 AM
    definition, probability
    • Replies: 1
    • Views: 2,588
    01-21-2012, 09:54 AM Go to last post
  27. Request for help developing a commercial solution

    Firstly, I apologise if I am in the wrong place. In a business context we need to produce a model to help planning tasks. We are a small commercial...

    Started by DAvidA1‎, 02-28-2012 12:02 PM
    • Replies: 0
    • Views: 1,327
    02-28-2012, 12:02 PM Go to last post
  28. Arithmetic proof of predicted values

    Maybe the title of this thread should be: Arithmetic proof of predicted values or Why you shouldn't let stats lie dormant in your life for 7...

    Started by davidbgonzalez‎, 02-25-2011 12:26 PM
    discrete response models, probability question, proof
    • Replies: 2
    • Views: 2,376
    02-25-2011, 01:08 PM Go to last post
  29. Deriving posterior probability from frequencies

    I'm working through an introductory Bayesian stats text: Doing Bayesian Analysis. Having been away from stats for a while and having never working...

    Started by davidbgonzalez‎, 03-02-2011 07:13 PM
    bayesian, probability question
    • Replies: 5
    • Views: 3,561
    11-29-2012, 01:15 PM Go to last post
  30. Question approximating density function for a non-normal distribution

    Hello, My question is actually quite short, but I'll have to start by describing the context since I am not sure how to directly ask it. ...

    Started by davidbr‎, 07-31-2010 01:26 PM
    • Replies: 1
    • Views: 3,971
    08-01-2010, 11:18 PM Go to last post
  31. Explanation counting principle problem

    If a travel agency o ers special weekend trips to 12 di erent cities, by air, rail, bus, or sea, in how many di erent ways can such a trip be...

    Started by davidchung2004‎, 06-17-2014 02:27 PM
    • Replies: 4
    • Views: 3,589
    06-18-2014, 12:50 AM Go to last post
  32. Game probability query

    I'm trying to develop a game idea - a kind of passport bingo. 200 people each have passports. Each passport has a 9 digit number. If I read out a...

    Started by davidehc‎, 02-27-2015 07:05 AM
    • Replies: 0
    • Views: 1,203
    02-27-2015, 07:05 AM Go to last post
  33. basic probability question

    Probability of 12 defects in one batch = 0.3060 If two more batches are produced, find the probability that all 3 batches will contain at least 12...

    Started by davidfsmith‎, 04-02-2006 03:14 PM
    • Replies: 2
    • Views: 2,636
    04-03-2006, 03:00 PM Go to last post
  34. Help on probability

    Probability of 12 defects in one batch = 0.3060 If two more batches are produced, find the probability that all 3 batches will contain at least 12...

    Started by davidfsmith‎, 04-04-2006 08:23 AM
    • Replies: 4
    • Views: 2,681
    04-05-2006, 10:01 AM Go to last post
  35. Please help me with this problem

    The random variable x represents the number of boys in a family of three children. Assuming that boys and girls are equally likely, find the mean and...

    Started by davidmav19‎, 10-27-2010 06:21 PM
    • Replies: 13
    • Views: 6,275
    10-27-2010, 09:12 PM Go to last post
  36. Please assist with issue

    Decide whether the experiment is a binomial experiment. If it is not, explain why. Each week, a man plays a game in which he has a 41% chance of...

    Started by davidmav19‎, 10-31-2010 03:32 PM
    • Replies: 2
    • Views: 3,012
    10-31-2010, 03:45 PM Go to last post
  37. please help

    1. The following data represent the pulse rates of females: Pulse Rate Frequency 60 - 69 12 70 - 79 14 80 - 89 11 90- 99 1 ...

    Started by davidmav19‎, 12-07-2010 08:40 PM
    • Replies: 3
    • Views: 3,241
    12-07-2010, 09:06 PM Go to last post
  38. problem with a Combination rule word problem

    I am having a little trouble finding the answer to this word problem If you drew three cards form a standard deck without replacement, what would...

    Started by David_langstaff‎, 11-02-2009 01:22 PM
    • Replies: 1
    • Views: 6,649
    11-02-2009, 02:13 PM Go to last post
  39. Probability distribution

    hi everyone, I am unable to solve this exercice can you help me please ? Exercice : Starbucks has entered into an agreement with a...

    Started by Davina64‎, 05-15-2013 12:35 PM
    • Replies: 4
    • Views: 1,823
    05-15-2013, 01:30 PM Go to last post
  40. Poisson Distribution

    Hai everyone, I am stuck with this exercise Arrivals to a bank automated teller machine (ATM) are distributed according to a poisson...

    Started by Davina64‎, 05-16-2013 01:18 PM
    • Replies: 4
    • Views: 2,923
    05-16-2013, 02:29 PM Go to last post
  41. Probability

    According to a survey done by a dealership company, they have 40% of customer who enters the shop that are woman and it says that there are 37% of...

    Started by Davina64‎, 06-10-2013 12:33 PM
    • Replies: 3
    • Views: 1,739
    06-11-2013, 08:03 AM Go to last post
  42. Easy Probability Question

    Hi ppl, Im trying to solve to following simple problem but I'm finding it harder than expected. This problem has to be eventually be generalized...

    Started by davmt‎, 07-26-2010 07:08 PM
    • Replies: 6
    • Views: 2,864
    08-09-2010, 08:46 PM Go to last post
  43. Am I right?

    :confused: Here is the Question. The probablity that one of your new batch of printers will break down has been an unacceptable 0.2 each day. You...

    Started by daxiusa‎, 11-13-2007 04:33 PM
    • Replies: 1
    • Views: 2,360
    11-15-2007, 10:09 PM Go to last post
  44. Probability of the sample Mean

    The weight (x) of an adult salmon in Lake Michigan is a normally distributed variable with the mean 5.5 lbs and a standard deviation of 0.5 lbs. An...

    Started by dayday404‎, 12-07-2010 06:11 PM
    • Replies: 0
    • Views: 2,422
    12-07-2010, 06:11 PM Go to last post
  45. Conditional probability problem

    Hi, So here's the problem I've been working on for several hours now: "Deer ticks can be carriers of either Lyme disease or HGE. Based on a...

    Started by daydreamset‎, 02-05-2012 07:29 AM
    • Replies: 7
    • Views: 5,954
    02-06-2012, 09:27 PM Go to last post
  46. How do I figure out the E[X]?

    Consider a game called “Money Bags”. The game consists of drawing from a bag filled with (25) twenty five chips with different values: • (1) One...

    Started by Dazed‎, 12-07-2012 02:52 AM
    • Replies: 1
    • Views: 2,565
    12-07-2012, 03:40 AM Go to last post
  47. Probability question!!

    How do we use z-scores to compute the probability of normally distributed, continuous variables? Does it have to do with the pearson r...

    Started by db451‎, 11-07-2007 06:11 PM
    • Replies: 0
    • Views: 2,589
    11-07-2007, 06:11 PM Go to last post
  48. Simulation problem

    Hi guys I am having problems calculation the theoretical mean in excel. I was told to do this by my teacher using expected value formula. Please see...

    Started by dbadboy‎, 10-30-2010 07:52 PM
    • Replies: 2
    • Views: 2,626
    10-31-2010, 05:40 AM Go to last post
  49. Hypergeometric Random Variable help!

    Here's the question, I've tried all the formulas given to me in the chapter, and none are working. I'm guessing to use the mean and...

    Started by dbm4891‎, 10-24-2011 02:30 PM
    • Replies: 4
    • Views: 5,826
    10-24-2011, 03:01 PM Go to last post
  50. Combined probabilities

    Hi all! I have a pretty interesting problem that I was hoping someone here could help me with. I am designing an application where a given user...

    Started by dbnelson2403‎, 07-24-2009 11:59 PM
    • Replies: 0
    • Views: 2,764
    07-24-2009, 11:59 PM Go to last post
  51. Angry Probability of Drivinf while intoxicated

    On New Year's Eve, the probability of a person having a car accident is 0.09. The probability of a person driving wh)le intoxicated is 0.32 and...

    Started by Dchaser‎, 02-04-2013 01:15 AM
    • Replies: 2
    • Views: 3,676
    02-05-2013, 08:32 AM Go to last post
  52. Probability of multiple tags on a sea turtles pinging within an hour

    There are 7 sea turtles each with a pinging tag on it. Turtle 1: 52% of an hour tag is pinging Turtle 2: 52% of an hour tag is pinging Turtle 3:...

    Started by dcrear‎, 09-06-2012 11:41 PM
    • Replies: 2
    • Views: 1,704
    09-18-2012, 02:39 PM Go to last post
  53. Probability Problems! Help! Thanks

    Recently bar codes put on retail products were changed so that they would represent 14 digits instead of 12. How many different products can now be...

    Started by dctan12‎, 07-01-2008 12:45 AM
    • Replies: 1
    • Views: 3,474
    07-01-2008, 07:44 AM Go to last post
  54. Calculation of Frequency

    Hi, I am trying to calculate the probability of randomly picking a card (A through 2) from a standard deck of 52 + 1 joker if 5 cards are dealt. ...

    Started by DCtheplace2b‎, 07-16-2009 04:04 PM
    • Replies: 0
    • Views: 1,748
    07-16-2009, 04:04 PM Go to last post
  55. Can ANYONE solve this??????

    I am trying to figure out the method I should use to find the probability of picking any rank of cards (Ace through Deuce) from a standard deck of 52...

    Started by DCtheplace2b‎, 07-18-2009 12:14 PM
    • Replies: 5
    • Views: 3,027
    07-20-2009, 01:15 PM Go to last post
  56. New Approach

    :confused::confused: I am still unable to find the probability of drawing only ONE queen if 5 cards are dealt from a standard deck of 52. I think I...

    Started by DCtheplace2b‎, 07-18-2009 09:20 PM
    • Replies: 2
    • Views: 2,083
    07-19-2009, 01:24 PM Go to last post
  57. Probability of getting a certain card game hand combo

    Trying to figure out the chance of getting a certain combination of cards in a card game. This is related to Magic: The Gathering if that matters. ...

    Started by dctrombly‎, 04-13-2016 11:31 PM
    • Replies: 0
    • Views: 882
    04-13-2016, 11:31 PM Go to last post
  58. Comparing conditional probabilities?

    I have 250 respondents. They’ve reported their participation in three different kinds of political activities: reading about politics on line,...

    Started by DDN1972‎, 07-17-2008 07:08 PM
    • Replies: 2
    • Views: 2,858
    07-17-2008, 08:22 PM Go to last post
  59. Question Type I and Type II error

    Does anyone know the formula for getting Type I and II error? I found examples around the web but i didnt understand though i need to have the std,...

    Started by ddtankerz‎, 05-26-2013 07:16 AM
    • Replies: 4
    • Views: 979
    05-27-2013, 11:09 AM Go to last post
  60. 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: 3,239
    03-06-2016, 02:29 AM Go to last post

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