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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: 31,047
    09-30-2005, 09:44 AM Go to last post
  1. Immortality & Bayesian Statistics

    - I seem to have written an 8 page paper virtually proving -- through Bayesian statistics -- that we are immortal (or something similar). Obviously,...

    Started by Jabba‎, 03-16-2015 10:12 AM
    6 Pages
    1 2 3 ... 6
    • Replies: 81
    • Views: 17,689
    04-06-2015, 05:11 PM Go to last post
  2. Probability Problem

    Pls help...........:wave: My problem exercise goes like this - An employee of the records office at a certain school currently has 10 forms on...

    Started by leo‎, 04-10-2008 08:31 AM
    5 Pages
    1 2 3 ... 5
    • Replies: 74
    • Views: 64,397
    06-04-2008, 07:00 PM Go to last post
  3. Immortality and Conditional Probability

    - Hopefully, I won't aggravate readers so much with this approach. - Here, my claim is simply that the likelihood of my current existence is...

    Started by Jabba‎, 04-13-2015 10:20 AM
    5 Pages
    1 2 3 ... 5
    • Replies: 71
    • Views: 15,614
    04-22-2015, 06:50 AM Go to last post
  4. Help with Bayesian question please

    Just got a question with Bayes problem, I always struggle to understand the actual question in Bayes problems so that could be why I'm stuck, but...

    Started by jamessuh36‎, 07-22-2015 08:31 PM
    4 Pages
    1 2 3 ... 4
    • Replies: 48
    • Views: 6,822
    07-27-2015, 09:48 AM Go to last post
  5. Probability of coincidence ?

    Probability of coincidence ? (WARNING... resolving this problem may force upon you world fame and extreme wealth) I basically don't know where to...

    Started by RobAbility‎, 02-19-2014 05:06 PM
    3 Pages
    1 2 3
    • Replies: 40
    • Views: 13,476
    02-27-2014, 09:21 PM Go to last post
  6. Game probability problem

    Two armies of n attackers and m defenders do battle. If n=1, then there is 1 attacking die; if n=2 there are 2 attacking dice; if n \geq 3 there are...

    Started by GameGod‎, 05-28-2013 06:39 PM
    3 Pages
    1 2 3
    • Replies: 34
    • Views: 7,001
    07-08-2013, 12:43 AM Go to last post
  7. A question about the distribution of random numbers

    Suppose I have two independent random variables A, and B, which are distributed Normally as follows: A: N~(MA,VA) B: N~(MB,VB) Now consider...

    Started by BigBugBuzzz‎, 09-18-2012 09:06 AM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 6,051
    09-20-2012, 08:35 AM Go to last post
  8. Probability System, discrete dist.

    here is the system we're dealing with here Component 1 is the key one while an identical backup component is 2 and is in an "off" state until...

    Started by gator78‎, 11-08-2010 10:47 PM
    2 Pages
    1 2
    • Replies: 28
    • Views: 10,182
    11-16-2010, 12:10 AM Go to last post
  9. I need some help, please

    Hi, I have found some difficulty in solving this exercise. HINT: Use the fact that T/σ^2~chi-squared (n-1) and the moments of the chi-squared...

    Started by Fahad Alqahtani‎, 11-13-2010 04:19 PM
    2 Pages
    1 2
    • Replies: 28
    • Views: 13,574
    11-13-2013, 04:10 PM Go to last post
  10. The probability of seeing 13 minutes past the hour at least once every day?

    Each day, there are 24 opportunities in a 24 hour period to see 13 minutes past the hour. There are 60 x 24 possible times that can be reported in...

    Started by Petros‎, 10-30-2014 09:35 AM
    2 Pages
    1 2
    • Replies: 28
    • Views: 8,420
    11-08-2014, 03:40 PM Go to last post
  11. Please can you check my answers

    Q1) A Newspaper dealer sells 1 newspaper every 6 mins on average. You can assume it follows a Poisson Distribution. a) Whats the probability that...

    Started by zkm1223‎, 12-27-2010 08:06 AM
    2 Pages
    1 2
    • Replies: 27
    • Views: 13,265
    01-03-2011, 11:10 AM Go to last post
  12. Consequences of choosing the wrong likelihood function...

    hey everyone! just a quicky-quick question here. i think i remember reading somewhere that some of the nice properties of parameter estimates...

    Started by spunky‎, 09-20-2012 02:49 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 7,952
    09-23-2012, 12:17 PM Go to last post
  13. Simple problem

    Hey there, I have a question that probably has a simple answer. It's about coin flipping. If you flip a (normal) coin 10 ten times, and it...

    Started by djarvis‎, 04-21-2009 09:33 AM
    2 Pages
    1 2
    • Replies: 24
    • Views: 8,245
    06-02-2009, 11:20 AM Go to last post
  14. Joint Density f(X,Y) integration when there is no Y in the eqn

    Hi I'm having difficulties with integration by parts when the main function of a joint distribution doesn't contain the Y. Here it is: Let X and Y...

    Started by crusoe‎, 02-12-2011 06:35 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 8,983
    02-14-2011, 04:09 AM Go to last post
  15. [SOLVED] Sensitivity/Specificity

    Here is my question: The sensitivity of a screening test is 0.95 and it's specificity is 0.85. The rate of the disease for which the test is used...

    Started by kelly g‎, 01-28-2012 03:17 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 7,891
    01-29-2012, 11:08 PM Go to last post
  16. Lightbulb mann whitney test or Kolmogorov smirnov test?

    I'm working with non parametric methods to compare two samples and detect diferences between them. I used the mann-whitney test and obtained, for all...

    Started by Marga‎, 11-02-2006 06:46 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 27,926
    05-09-2010, 02:28 PM Go to last post
  17. Please help Its urgent --Probability question

    Robert is a

    Started by sahilkthr‎, 11-05-2008 01:51 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 5,802
    11-06-2008, 06:03 PM Go to last post
  18. Need help to prove professor may have altered grades at our university

    We had a class of 15 students who took an exam: test scores were: 56, 65, 65, 54, 28, 65, 55, 47, 68, 41, 71, 86, 65, 67, 65 respectively on a non...

    Started by swamifez‎, 10-04-2014 04:36 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,955
    10-05-2014, 07:45 PM Go to last post
  19. What is the difference between classical and bayesian understanding of probability?

    I am reading a book on monte carlo analysis and the author stresses in passing that the definition of probability used in an example in the book is...

    Started by noetsi‎, 02-07-2017 05:47 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,328
    02-08-2017, 10:28 PM Go to last post
  20. Keno or LOTTO style

    So, here is how the game goes. suppose that the game uses the numbers 1 through 50 and suppose that the operator selects eight of these. If the...

    Started by panz‎, 02-06-2006 05:41 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 11,057
    09-27-2006, 04:41 PM Go to last post
  21. Angry Please help!! Basic Probability.

    Hi im having trouble with this question. If anyone could help me out thatd be great , Im not sure where to start! Heres info: The cost of...

    Started by el1‎, 03-30-2008 08:56 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 6,991
    03-30-2008, 10:38 PM Go to last post
  22. Joint PDF problem

    Hey folks, I've got a problem with a joint probability density function question. Given f(x, y) = 6(x^2)y for 0 <= x <= y, x + y <= 2 and 0...

    Started by Halfpixel‎, 10-21-2008 10:27 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 14,414
    10-13-2010, 05:20 PM Go to last post
  23. Combination or Permutation

    Please see the attached file. I obtained the answer by writing down the outcome sets. I wondered if they were correct. May I ask, how do we compute...

    Started by dEconomist‎, 12-29-2011 12:41 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,906
    12-31-2011, 08:56 AM Go to last post
  24. need help understanding interview question

    Hello folks, I had a weird question which I am confused about. I was wondering if you anyone could help me or point me in the right direction (ie....

    Started by r4qx‎, 06-22-2013 06:38 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,850
    06-24-2013, 12:41 PM Go to last post
  25. Discrete Random Variable

    Hey all, I have a Discrete Random Variable taking on values x= 1,3,3^2,3^3,...3^m and f(x)=P(X=x)=c/x for some constant c, find value of c. How...

    Started by ITman95‎, 11-20-2013 01:42 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 3,909
    11-27-2013, 09:12 AM Go to last post
  26. simulating correlated, non-normal data: WHY DOES THIS HAPPEN!?

    i have been experimenting with different methods to generate correlated, non-normal data for comprehensive-exam purposes and i'm finding something i...

    Started by spunky‎, 09-21-2014 04:53 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,760
    09-21-2014, 08:59 PM Go to last post
  27. comparing two Poissonians

    What is the proper statistical test for the following: I know A1 and A2 to be Poisson distributed with (unknown) means x1 and x2. I have a single...

    Started by ee00‎, 06-21-2010 11:05 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 6,254
    06-23-2010, 12:36 PM Go to last post
  28. Maximum of a set of independent normal random variables

    Consider a set of random variables X_1, X_2, X_3, \ldots, X_n with unit varience but different means: \mu_1, \mu_2, \mu_3, \ldots, \mu_n . What...

    Started by mightymergz‎, 07-08-2010 02:50 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 21,353
    07-12-2010, 03:45 PM Go to last post
  29. Moment Generating Function of a Chi-Squared distribution

    Hey guys, need help with this question. Random Variables V and U are independent with N~(0,4). Let W = U^2 + V^2 . Calculate P(W>24). Is the...

    Started by saternal‎, 05-07-2012 09:02 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 8,033
    05-09-2012, 01:54 AM Go to last post
  30. Smile The sign of COV( f(x,y) , g(x,y) )

    I am a PhD student in Economics, I am reading a paper on statistics, and the author states the following proposition without proof. My question is is...

    Started by Stole‎, 11-01-2008 02:00 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 9,802
    11-02-2008, 03:56 PM Go to last post
  31. Settle an Argument

    A social club has a daily contest where they draw a name from a list of all of the club members. A name is drawn each day. In order to win, you must...

    Started by ScottWH‎, 07-23-2010 06:32 AM
    2 Pages
    1 2
    • Replies: 19
    • Views: 5,823
    07-27-2010, 07:22 PM Go to last post
  32. Unbiased Estimator Question

    Suppose that Y has a Poisson distribution with parameter lambda. How can I show that (-2)^lambda is an unbiased estimator of e^(-3*lambda)?

    Started by mada2009‎, 01-22-2012 04:48 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,912
    01-26-2012, 11:32 AM Go to last post
  33. random question about non-Guassian multivariate distributions...

    today in my seminar we were talking about all these interesting ways people can start with random uniform distributions and through doing and...

    Started by spunky‎, 03-07-2012 07:19 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 4,757
    03-09-2012, 07:55 PM Go to last post
  34. Martingale

    I must find an appropriate value so that the sequence constitutes a martingale wrt {X_n}. I have attached the problem so it is easier to read...

    Started by LED2127‎, 04-01-2012 01:34 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 4,181
    04-03-2012, 08:41 AM Go to last post
  35. Distribution of Data

    Hello forum members, I wonder if someone can kindly help. I have a dataset which I've uploaded and I'm trying to work out a sensible distribution....

    Started by jazzfish‎, 09-19-2017 05:33 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 849
    09-24-2017, 11:59 AM Go to last post
  36. Probability practise

    An electrical system is set up such that power can get from the source to the switch if both parts A and B are working, if part C is working or if...

    Started by SadieKhan‎, 09-18-2010 05:29 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 6,976
    09-21-2010, 04:41 PM Go to last post
  37. Probability on a Multiple Choice exam

    Hello, I am not very good at this type of stuff. I thought up something and I was wondering if someone can look over it and tell me if my...

    Started by Paradox‎, 11-27-2010 04:01 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 23,937
    12-25-2011, 07:07 AM Go to last post
  38. Normal Distribution & possible Standard Deviation error

    I have collected final sales data for over 12,000 sales of a single particular item. The prices range from $0.01 to a little over $4.00. I calculate...

    Started by derreckn‎, 02-18-2011 04:19 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 8,972
    02-23-2011, 09:10 AM Go to last post
  39. Time scaling a geometric random variable

    Hello, When one performs bernoulli trials at discrete times t = 1, 2, 3, ....., with the probability of a success at an arbitrary trial given by...

    Started by mathRookie2013‎, 09-01-2013 11:29 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 4,221
    09-01-2013, 03:44 PM Go to last post
  40. Layperson with a question

    Hello! A friend of mine recently asked me for help with this, and while we kicked around a few ideas, we weren't really satisfied. That, and the fact...

    Started by Phi618‎, 07-20-2015 07:11 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 4,569
    08-06-2015, 09:10 PM Go to last post
  41. Not Statistically Significant.... or is it?

    I am comparing 2 groups to see if there are differences in GPA across 4 years of high school. Group A has a higher mean for all 4 years, BUT... the...

    Started by Stinky‎, 08-31-2017 05:06 PM
    2 Pages
    1 2
    sum of means
    • Replies: 18
    • Views: 1,216
    09-02-2017, 10:52 AM Go to last post
  42. probability

    This is a part of a problem. I decided to ask it here after hours of trying to solve it... Two tennis players make a match composed of 5 sets....

    Started by demolay‎, 11-25-2005 12:34 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 7,935
    11-30-2005, 04:49 PM Go to last post
  43. Joint density function

    This is from Exercise 5.26 from Mathematical Statistics with Applications v6. f (y1, y2) = {2, 0 <= y1 <= 1, 0 <= y2 <= 1, 0 <= y1 + y2 <= 1 ...

    Started by statsdud‎, 04-22-2008 05:43 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 7,853
    04-22-2008, 05:15 PM Go to last post
  44. probability question

    Hello, I am having trouble with my stat homework. Maybe someone can give me some guidance? I would really appreciate it! A woman is fishing for...

    Started by letsstophere‎, 10-21-2008 09:51 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 7,962
    10-28-2008, 04:23 PM Go to last post
  45. probability homework

    Hello, I am having difficulty figuring out my homework. I made attempts and could someone check my answers and see if I'm right or make suggestions?...

    Started by letsstophere‎, 10-28-2008 08:07 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 7,008
    10-28-2008, 04:41 PM Go to last post
  46. Difficult Integral standard normal pdf/cdf

    I would like to get an explicit analytical form for the integral (below)...or something close to it with an associated (small) error term. (Note that...

    Started by Dragan‎, 05-28-2010 11:37 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 14,539
    05-31-2010, 09:35 AM Go to last post
  47. Probability in my exam

    Here is the scenario for my practice exam: "You have been hired by a firm which produces customised engineering machinery to provide some...

    Started by newbiestats‎, 11-13-2011 09:10 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 23,222
    05-30-2012, 01:34 AM Go to last post
  48. 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: 15,776
    06-29-2012, 09:43 AM Go to last post
  49. [SOLVED] Correlation between two normal variables ...

    Suppose A ~ N (0,a), B ~ N (0,b-a), C = A + B what is the expression for the correlation between A and C?

    Started by BigBugBuzzz‎, 02-03-2012 12:37 PM
    2 Pages
    1 2
    correlation, normal random variables
    • Replies: 17
    • Views: 7,163
    02-04-2012, 11:48 AM Go to last post
  50. Thinking Fast and Slow - Probability question

    In his book (Thinking Fast and Slow) Kahneman states: For example, if you believe that 3% of graduate students are enrolled in computer science (the...

    Started by wardjames‎, 02-06-2012 12:01 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 8,805
    02-08-2012, 04:30 PM Go to last post
  51. I have a real stumper here

    I have a question that has stumped everyone I have asked. I wonder if anyone can help. Here is the scenario. Every time that team A plays on...

    Started by HoldenRg‎, 02-09-2012 06:13 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 4,241
    03-30-2012, 11:47 PM Go to last post
  52. Probability with sampling question

    i have been having problems with what should be a trivial probability problem Suppose there are 130 patients. Each patient was administered one of...

    Started by hyperion111‎, 08-05-2012 10:39 PM
    2 Pages
    1 2
    conditional probability, probability
    • Replies: 17
    • Views: 4,981
    08-06-2012, 12:18 AM Go to last post
  53. Card draw and joint probability

    I wonder if I'm overthinking this and want confirmation... I'm in thought about how to apply (1) to find the probability of 2 not independent...

    Started by Lunaticfringe‎, 08-04-2013 06:09 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 5,698
    08-12-2013, 03:34 PM Go to last post
  54. Probability question

    I recently stumbled up on this question. Need help in solving this. N balls thrown at N baskets, what is the chance that a random basket will have...

    Started by sunragav‎, 04-27-2016 02:07 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 3,584
    05-02-2016, 06:58 AM Go to last post
  55. probability

    a pharmaceutical firm claims that a certain medication is 92% effective in relieving arthric pain. if ten people who suffer from arthritis are...

    Started by sweetlady‎, 09-01-2006 08:47 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,160
    09-21-2006, 08:28 AM Go to last post
  56. simple coin flip problem

    hi, I recently discovered this forum and I think this could help me with my stats courses... I havent received the text book yet, so my first...

    Started by Logman‎, 09-30-2006 11:52 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 11,689
    10-23-2006, 09:09 AM Go to last post
  57. Probability Simulation Software Recommendation

    I am looking for software recommendations that will allow me to define a known multi-level game for the purposes of running simulations to determine...

    Started by bpbenda‎, 08-14-2010 08:10 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 9,272
    08-19-2010, 10:59 AM Go to last post
  58. Probability of radar detection

    Aircraft is in certain area, radar correctly registers its presence with prob. of 0.95. If it is not present, radar falsely registers its presence...

    Started by gator78‎, 10-09-2010 10:47 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 12,141
    10-11-2010, 02:39 PM Go to last post
  59. Question transformation problem

    If f_X(x)=6(x-x^2) , 0<x<1, find the distribution of Y=3X^2-2X^3

    Started by Sambit‎, 02-05-2011 01:52 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,949
    02-07-2011, 08:36 AM Go to last post
  60. show that the sum of e(i) = 0 and the sum of e(i)*Yhat(i) = 0

    Consider a usual multiple linear regression model: Y = X β + ε where Y is a (n x 1) response vector, X is a (n x p) matrix with its first column...

    Started by alias‎, 11-13-2011 03:34 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 15,165
    11-14-2011, 02:40 AM Go to last post

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