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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: 30,333
    09-30-2005, 09:44 AM Go to last post
  1. An event and its complement

    My wife was overdue clearing customs so I thought the probability of her showing up any minute was increasing. But then I thought, suppose -there...

    Started by Outlier‎, 10-23-2014 08:27 PM
    complement, event
    • Replies: 6
    • Views: 1,846
    10-28-2014, 03:22 PM Go to last post
  2. an interesting Bayesian stat question

    Suppose a random sample of size n is from uniform distribution U(0, exp(gamma)), suppose the prior distribution of gamma is N(a, b), how to find the...

    Started by sweetie‎, 05-02-2007 12:07 AM
    • Replies: 1
    • Views: 1,964
    05-02-2007, 11:21 AM Go to last post
  3. An interesting probability calculation problem

    Hello all! I'll be really glad if you respond to this question. I am working with an interesting probability calculation problem. In my problem...

    Started by Blain Waan‎, 01-17-2013 01:51 PM
    • Replies: 2
    • Views: 1,464
    01-17-2013, 02:20 PM Go to last post
  4. An odd payout question...Please Help!

    I have a problem that I am trying to solve. I think my answer is correct, but I am not 100% sure. Any help you could provide would be greatly...

    Started by NCSUStudent‎, 11-03-2015 07:16 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,741
    11-05-2015, 01:16 AM Go to last post
  5. An Unusual Probability Question

    Hello everyone, I wonder if anyone would be willing to help me in deciding whether an unusual array of numbers I've found within the NIV Bible is...

    Started by thebluetriangle‎, 07-24-2008 09:44 AM
    • Replies: 0
    • Views: 2,954
    07-24-2008, 09:44 AM Go to last post
  6. Analysis of Squash Match

    I've been stuck on this problem for days. Any help, solutions or just pointers would be very welcome. A squash match is composed of a number of...

    Started by pvm‎, 06-25-2015 07:32 AM
    • Replies: 0
    • Views: 1,779
    06-25-2015, 07:32 AM Go to last post
  7. Analytic form for the quadrant probability of a (standard) bivariate t distribution?

    hellows! i may need this further along my manuscript and quick google searches aren't really being helpful, so maybe someone around here knows. ...

    Started by spunky‎, 02-22-2016 03:06 PM
    • Replies: 4
    • Views: 2,204
    03-01-2016, 11:01 PM Go to last post
  8. Question Analyzing a difference in conditional probabilities

    Hi all, I would like to compare the conditional probabilities of an animal behaving in a certain way at two different treatment types. Say the...

    Started by jhunter‎, 08-04-2008 07:03 PM
    • Replies: 4
    • Views: 2,650
    08-14-2008, 12:33 PM Go to last post
  9. Analyzing a sample list of numbers (median, quartiles, box plot)

    If you have a sample of 36 numbers (and some of these numbers are repeated more than once), how do you find the median, upper quartile, and lower...

    Started by Hco417‎, 10-24-2012 02:24 PM
    box plot, median, probability, sample
    • Replies: 2
    • Views: 1,903
    10-24-2012, 02:52 PM Go to last post
  10. Analyzing averages with different number of trials

    Hi everyone, I am having trouble with figuring out the workings of the following problem: If you have two drivers A and B. Driver A wins 100...

    Started by JB007‎, 08-17-2006 06:56 AM
    • Replies: 1
    • Views: 2,283
    08-29-2006, 01:24 PM Go to last post
  11. Analyzing test results- Normal Distribution

    Im 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: 5,739
    06-20-2006, 10:02 AM Go to last post
  12. analyzing the PDF or the CDF ??

    Hi, I'm recently grappling with the following problem: For my thesis i had to fit my data with two theoretical distribution (gamma and...

    Started by aledanda‎, 08-27-2009 07:22 AM
    • Replies: 0
    • Views: 2,364
    08-27-2009, 07:22 AM Go to last post
  13. Anderson-Darling test appropriate?

    Hi, I have a large (>2500) number of z-scores and I want to test if the distribution of these deviates from a unit normal distribution. I have...

    Started by rhayman‎, 09-14-2010 03:17 AM
    • Replies: 6
    • Views: 11,856
    10-17-2010, 10:04 PM Go to last post
  14. another baseball question

    Player will bat 4 times in this game. He is expected to get a single .15 of the time he goes to bat for 1 total base, he will get a double .05 a...

    Started by buddyreno‎, 08-22-2011 04:27 PM
    • Replies: 0
    • Views: 1,907
    08-22-2011, 04:27 PM Go to last post
  15. Another Bayes Problem

    Hello, thanks for taking the time to look at my question. I'm a first year student at a university in VA and I'm taking an entry level statistics...

    Started by WillNjmu‎, 09-23-2006 10:13 PM
    • Replies: 6
    • Views: 3,486
    09-25-2006, 08:45 AM Go to last post
  16. Another binomial problem....tell me if I'm heading in the right direction

    38% of people in the US have type A+ blood. If you randomly select 5 Americans & ask them their blood type, what is the probability that exactly 3...

    Started by disgurl‎, 06-17-2009 11:35 AM
    • Replies: 3
    • Views: 2,154
    06-17-2009, 11:54 AM Go to last post
  17. Another Die question

    If one was to roll a fair day and if the outcome is 2 then select a number at random in and other wise select a number at random in . if the number...

    Started by ITman95‎, 11-21-2013 04:39 PM
    • Replies: 10
    • Views: 2,067
    11-27-2013, 08:37 AM Go to last post
  18. Another difficult Gaussian integral

    Hello all, This time, I'm trying to compute \int^{\infty}_{-\infty} \frac{1}{c} \Phi\left(\frac{x}{a}\right)\phi\left(\frac{x-b}{c}\right) dx ...

    Started by sven svenson‎, 02-04-2011 04:12 PM
    • Replies: 3
    • Views: 4,297
    04-07-2011, 11:28 AM Go to last post
  19. Another game designer dice question...

    Firstly I want to introduce myself. My name is Daniel and I am a game designer (http://www.hazardgaming.com) when I'm not teaching mathematics. I can...

    Started by hazard‎, 03-08-2016 10:20 PM
    • Replies: 9
    • Views: 2,756
    04-09-2016, 09:53 AM Go to last post
  20. Another joint density problem

    it seems that i cant understand the boundaries... the joint density function: f(u,v)= a , u^2 <= v <= 1 0 , else find a i...

    Started by wuid‎, 06-20-2012 02:57 AM
    • Replies: 2
    • Views: 1,380
    06-20-2012, 04:21 AM Go to last post
  21. Another martingale question

    I have another martingale question. Let {X_n; n>=0} be a martingale with respect to {Y_n}. Prove for any set of integers k<=l<m that the...

    Started by LED2127‎, 04-02-2012 09:58 AM
    • Replies: 2
    • Views: 2,057
    04-02-2012, 10:10 AM Go to last post
  22. Another Negative Binomial ?

    I am afraid I have another one from the same kind... 20% of the forms being submitted in a government office contain a mistake in them. Someone...

    Started by WeeG‎, 01-16-2011 10:59 AM
    • Replies: 0
    • Views: 1,955
    01-16-2011, 10:59 AM Go to last post
  23. Another one!

    I think this is correct. I would appreciate any input. Question: The potential buyer of a particular engine requires that the engine start...

    Started by ankitj‎, 08-12-2009 01:38 PM
    • Replies: 2
    • Views: 3,050
    08-17-2009, 10:17 AM Go to last post
  24. another probability

    this question has three parts and once again I was able to answer part A and B by drawing the tree diagram but I cant seem to figure out part C ...

    Started by aptiva‎, 05-23-2006 12:26 PM
    • Replies: 2
    • Views: 2,660
    05-25-2006, 09:05 PM Go to last post
  25. Another probability...

    My question: An advisory committee on prison reform consists of 15 members. 9 favor, 4 oppose and 2 are indifferent about a certain program. If we...

    Started by kelly g‎, 03-07-2012 02:17 PM
    • Replies: 2
    • Views: 2,034
    03-07-2012, 03:33 PM Go to last post
  26. another Probabilty distribution :)

    Hi, okay here is another probabitly question that I was having trouble with. Q1: A company services home air conditioners. It is knwon that time...

    Started by Michelle‎, 06-01-2006 08:46 PM
    • Replies: 0
    • Views: 4,717
    06-01-2006, 08:46 PM Go to last post
  27. another problem :(

    Below are the distributions of blood types in the US and China: Blood type A B AB O US probability .1 .2 .3 .4 China prob. .2 .2 .2 .4 Choose an...

    Started by dumbcollegestudent‎, 10-11-2009 11:12 PM
    • Replies: 1
    • Views: 1,987
    10-12-2009, 03:55 AM Go to last post
  28. Another problem for maximizing profit...

    Consider a store owner who buys items one day for $1.00 and sells them the same day for $1.50. Assume the item has no value the next day and that...

    Started by turd112‎, 10-15-2008 04:55 PM
    • Replies: 0
    • Views: 2,701
    10-15-2008, 04:55 PM Go to last post
  29. Another question

    To ascertain the effectiveness of the advertising campaign for the Red Cross Annual Appeal on donations, a telephone survey of 309 Brisbane residents...

    Started by SadieKhan‎, 09-03-2010 07:19 AM
    • Replies: 3
    • Views: 2,214
    09-03-2010, 07:34 AM Go to last post
  30. another question....

    In order for a device to work properly, part A should work, AND, at least one of parts B,D and F (see diagram). All parts are independent, and the...

    Started by Yankel‎, 06-23-2011 09:58 AM
    • Replies: 10
    • Views: 2,723
    06-24-2011, 08:01 AM Go to last post
  31. another stats

    an experiment consists of choosing a point (x,y) at random from the interior of the circle disk x^2+y^2= 4 a/ find P(X>or = 1/2) b/ find the...

    Started by sonpham‎, 09-22-2011 04:33 PM
    • Replies: 0
    • Views: 1,698
    09-22-2011, 04:33 PM Go to last post
  32. another transformation

    Let X be a continuous random variable with p.d.f. f (x) = k(1 − x^2 ), |x| ≤ 1 0,otherwise Show that k = 3/4. I'm not sure...

    Started by jamesmartinn‎, 11-05-2008 12:05 PM
    • Replies: 2
    • Views: 2,895
    11-05-2008, 04:19 PM Go to last post
  33. Answer to Simple Prob Assignment

    This problem concerns MGB Problem 1 of Chapter 1: "One urn contains one black ball and one gold ball. A second urn contains one white and one gold...

    Started by statisticsnewbie‎, 12-05-2012 06:53 AM
    assignment, omega, probability, sample space
    • Replies: 3
    • Views: 2,560
    12-05-2012, 07:27 AM Go to last post
  34. any body help me please !!! tomorrow i ave exam but now I don't understand

    any body help me Two stocks, A and B, are known to be related. The probability that stock A will go up tomorrow is 0.20 and the probability that...

    Started by venis1010‎, 10-28-2007 08:09 AM
    • Replies: 0
    • Views: 2,889
    10-28-2007, 08:09 AM Go to last post
  35. any help?

    Okay, so I have a problem that I'm experiencing difficulty with and I'm curious if anyone can help me set up the equation for this problem: The...

    Started by gettingheadaches‎, 06-09-2008 07:00 PM
    • Replies: 3
    • Views: 2,045
    06-09-2008, 08:46 PM Go to last post
  36. Any suggestions on how to figure out these two problems????

    Im getting frustrated because....I have been looking through my textbooks and notes trying to figure out how to set these two problems up...Can...

    Started by cdwhitak‎, 02-19-2012 05:44 PM
    • Replies: 1
    • Views: 4,659
    02-19-2012, 05:47 PM Go to last post
  37. Cool Anyone can help me?

    I have a question asking about how to calculate the probability when the number of outcomes is not finite. Two points L and M are placed...

    Started by okblackwhite‎, 09-27-2006 06:29 AM
    • Replies: 0
    • Views: 1,784
    09-27-2006, 06:29 AM Go to last post
  38. Apartment vacancy question

    My friend is in this exact situation and we are having trouble figuring out the probability - please help! She is looking for a top-floor...

    Started by Colryk‎, 12-18-2013 11:16 PM
    probability help
    • Replies: 2
    • Views: 1,288
    12-19-2013, 05:52 PM Go to last post
  39. Apparent contradiction with the definition of probability

    Hi everyone, here is my doubt: according to the definition of probability the probability that in a coin tossing the result be heads is 0.5 because...

    Started by ivhenao‎, 03-05-2014 05:39 PM
    • Replies: 1
    • Views: 1,614
    03-05-2014, 05:58 PM Go to last post
  40. Application of binomial distribution

    Hello all, this is my first post. I am a practicing engineer facing a dilemma. Our resident statistician is out for the MONTH, and I have a deadline...

    Started by amf08006‎, 05-16-2014 08:53 AM
    • Replies: 0
    • Views: 2,191
    05-16-2014, 08:53 AM Go to last post
  41. Application of conditional probability with three variables

    I have a question concerning the following problem: A hunter has a double-barrelled shotgun. The probability that at least one shot hits the...

    Started by desy‎, 05-09-2014 04:45 PM
    bayesian formula, conditional probabilty
    • Replies: 0
    • Views: 2,158
    05-09-2014, 04:45 PM Go to last post
  42. Application of Probability in Maintenance

    Good Day to everyone Can anyone please help me, i'm a maintenance personnel (machines or engines). We had a machine it could have two (2)...

    Started by kulafo‎, 08-24-2013 06:16 PM
    • Replies: 2
    • Views: 1,559
    08-25-2013, 07:38 AM Go to last post
  43. 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: 1,783
    02-08-2014, 10:18 PM Go to last post
  44. Applying distribution theory to scoring events in a sports match

    Hi! Sorry for the long message - but I think it's an interesting problem in the sports world and is meant for practical, real-world use - so...

    Started by iambasil‎, 03-12-2012 09:04 PM
    • Replies: 0
    • Views: 1,543
    03-12-2012, 09:04 PM Go to last post
  45. Exclamation Appropriate Hypothesis

    A company with a large fleet of cars hopes to keep gasoline costs down, and sets a goal of attaining a fleet average of at least 26 miles per gallon....

    Started by dmicevski‎, 06-01-2011 10:58 PM
    • Replies: 2
    • Views: 8,190
    06-07-2011, 10:26 PM Go to last post
  46. Approximately chi-quadrat distributed

    Hi all, the definition of the chi-quadrat distribution is \chi^2_n \sim Z_1^2 + \dots + Z_n^2 with Z_i \sim N(0,1) My question: Are...

    Started by Jacov‎, 04-09-2012 09:10 AM
    • Replies: 6
    • Views: 1,988
    04-10-2012, 01:13 AM Go to last post
  47. Approximately normal distribution

    I am trying to figure out how to calculate QU and QL (Quarter 3 and Quarter 4). On some problems, the book tells me what Q3 and Q4 is, and on...

    Started by ricketstar‎, 10-19-2006 11:12 PM
    • Replies: 1
    • Views: 3,060
    10-20-2006, 08:40 AM Go to last post
  48. approximating a density by using a mixture density

    Is there any journal article discussing approximating a density by having a mixture density? Or even an exact conversion? I plotted a mixture...

    Started by ltleung‎, 07-08-2012 09:01 AM
    • Replies: 1
    • Views: 1,164
    07-08-2012, 02:57 PM Go to last post
  49. approximating binomial distribution w/ normal distribution

    Hi all, I'm stuck on the following problem: The percentage of fat in the bodies of American men is an approximately normal random variable with...

    Started by fiddlestix327‎, 06-24-2008 02:11 PM
    • Replies: 2
    • Views: 11,997
    06-25-2008, 06:45 PM Go to last post
  50. 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: 4,042
    08-01-2010, 11:18 PM Go to last post
  51. Approximation to Normal Distribution

    here's a question i'm working on: The times of the finishers in a local 10 km run are normally distributed with mean 61 minutes and variance 81...

    Started by yon‎, 07-06-2009 07:28 PM
    • Replies: 2
    • Views: 3,034
    07-07-2009, 12:54 PM Go to last post
  52. Aproximate inference about a population/distribution

    Hello, I am sorry for how confusing this will be. I was reading a while back about making a determination about the probability of a variable in a...

    Started by joseclar‎, 10-01-2012 12:06 PM
    • Replies: 3
    • Views: 1,443
    10-01-2012, 03:41 PM Go to last post
  53. Are (sample) correlation matrices covariance matrices?

    All my life I had been under the impression that the correlation matrix was a type of covariance matrix. They share similar features: they are...

    Started by will22‎, 05-07-2013 01:32 PM
    • Replies: 2
    • Views: 1,341
    05-07-2013, 03:21 PM Go to last post
  54. Are distributions the "same" in their extreme values?

    Hello, I have two independent datasets which are measurements of the height of ocean waves. I would like to tell if these datasets have the same...

    Started by KE2‎, 01-29-2009 10:06 AM
    • Replies: 3
    • Views: 3,647
    01-29-2009, 02:23 PM Go to last post
  55. are mixture of Gaussian distributions still elliptical distributions?

    basically what the title of the thread says, lol. most of my google searches point towards a 'yes' (which is good) but i just wanted to run it...

    Started by spunky‎, 07-01-2013 03:39 AM
    • Replies: 10
    • Views: 2,320
    07-01-2013, 03:07 PM Go to last post
  56. Are the following events independent or dependent?

    I asked the following question in an exam. I can argue both ways, but I am very interested in any further thoughts. ---------------- Are the...

    Started by jgaleach‎, 02-18-2016 11:31 AM
    dependent, independent, probability
    • Replies: 2
    • Views: 2,077
    02-18-2016, 11:54 AM Go to last post
  57. Area Probability comparison

    It's been a while since I have studied statistics, but it seems I need it for my work. I have found and area of intersection between two others...

    Started by Mrkeri‎, 09-05-2013 07:05 AM
    probability
    • Replies: 2
    • Views: 1,490
    09-06-2013, 04:49 AM Go to last post
  58. area under curve normal distribution

    Two issues, that I am confused about after reading statistics books. Example: weight of an adult is normally distributed with mean of 180 lbs...

    Started by billmt‎, 12-08-2012 01:38 PM
    conditional expectation, normal distribution
    • Replies: 3
    • Views: 1,935
    12-08-2012, 04:35 PM Go to last post
  59. Post Area under PDF for Normal, beta, gamma, and weibull distribution

    Dear Stata user/Professional! I have a problem of integral function estimation for the Normal, Beta, Gamma, and Weibull density function in stata. ...

    Started by Mahadeb‎, 08-30-2012 12:24 AM
    • Replies: 0
    • Views: 3,752
    08-30-2012, 12:24 AM Go to last post
  60. Area under the sampling distribution curve

    Hi, Given a random sample size of n=10 (from a normal population) and a standard deviation of 5, how can I calculate the area under the sampling...

    Started by Silvanus‎, 08-24-2008 08:22 PM
    • Replies: 2
    • Views: 4,640
    08-25-2008, 04:11 PM Go to last post

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