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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: 30,210
    09-30-2005, 09:44 AM Go to last post
  1. Question [Question] "Supermatch" cards problem

    Dear everyone, I have a question that i couldn't figure out clearly. Here is it. Here will i write down what i have been done, and please...

    Started by ilhamdoank‎, 10-24-2011 05:44 PM
    exclusion, inclusion, probability
    • Replies: 1
    • Views: 2,318
    10-25-2011, 02:07 AM Go to last post
  2. probability question please help

    need help understanding this question please? the number of lightning strikes on a square kilometer of open ground in a year has mean 6 and standard...

    Started by dsnyder1‎, 10-24-2011 02:38 PM
    • Replies: 1
    • Views: 4,393
    10-25-2011, 02:35 AM Go to last post
  3. Smile Help with greater than and less than problems

    I am looking for help that basically lets me know if I am on the right track with my methods of solving these problems. I have to use Excel. Please...

    Started by Wildcat‎, 10-25-2011 12:31 PM
    • Replies: 2
    • Views: 2,659
    10-25-2011, 02:57 PM Go to last post
  4. Confused with the Sampling Distribution of p

    Hello all, I really hope that I can get an answer. I've worked the problem out, but I keep going back and forth in my head about the answers....

    Started by kevinoc0‎, 10-25-2011 08:43 PM
    • Replies: 1
    • Views: 2,028
    10-25-2011, 11:29 PM Go to last post
  5. Sampling and Estimation (From STPM)

    A random sample X1,X2,X3,...,Xn is taken from a normal population with mean "u" and variance 1. Determine the smallest sample size which is required...

    Started by Euclidzz‎, 10-25-2011 09:48 PM
    • Replies: 4
    • Views: 3,514
    10-25-2011, 11:49 PM Go to last post
  6. Question Wheel of lucky problem

    Dear everyone, Here is the problem I tried by defining the functions S(a) and C(a), where S(a) denotes the probability of player A winning if...

    Started by ilhamdoank‎, 10-25-2011 05:07 PM
    probability question
    • Replies: 4
    • Views: 2,229
    10-26-2011, 11:23 AM Go to last post
  7. Question [Question] Birthday Problem

    Here is the problem, I already get the answer, \frac{r}{365 -365(\frac{364}{365})^s} What do you think?

    Started by ilhamdoank‎, 10-26-2011 11:33 AM
    birthday problem, probability
    • Replies: 1
    • Views: 2,436
    10-26-2011, 12:04 PM Go to last post
  8. Can someone explain how to solve this simple problem?

    Your favorite team is in the World Series. You have assigned a probability of 63% that they will win the championship. Past records indicate that...

    Started by ekkakub‎, 10-26-2011 07:39 PM
    • Replies: 5
    • Views: 6,168
    10-26-2011, 09:10 PM Go to last post
  9. Probability question.

    suppose i have a population n=90386 where: typeA=46362, typeB=22012, typeC=22012 if i choose 145 items from the population (without returning...

    Started by screamingforanewday‎, 10-26-2011 07:34 PM
    • Replies: 9
    • Views: 2,369
    10-26-2011, 09:58 PM Go to last post
  10. Expected Value Question

    Plz help me with this question. I tried but couldn't get the correct answer (Q) A school class of 120 students are driven in 3 buses to a dance...

    Started by MTE-11‎, 10-27-2011 04:48 AM
    • Replies: 0
    • Views: 3,609
    10-27-2011, 04:48 AM Go to last post
  11. conditional probability mass function

    Is my solution correct (Q) Suppose that p(x, y), the joint probability mass function of X and Y, is given by p(0, 0) = 0.4 p(0, 1) = 0.2 p(1, 0)...

    Started by MTE-11‎, 10-27-2011 04:52 AM
    • Replies: 0
    • Views: 2,630
    10-27-2011, 04:52 AM Go to last post
  12. Random Variable

    (Q) Suppose that it is known that the number of item produced in a factory during a week is a random variable with mean 50. i) What can be said...

    Started by MTE-11‎, 10-27-2011 05:17 AM
    • Replies: 1
    • Views: 1,745
    10-27-2011, 08:02 AM Go to last post
  13. hypergeometric? mean and variance

    Consider a group of T persons and let a_1, \ \ldots \ , a_T denote the heights of these T persons. Suppose that n persons are selected from...

    Started by joestevens‎, 10-26-2011 06:55 PM
    solved
    • Replies: 3
    • Views: 3,435
    10-28-2011, 07:42 AM Go to last post
  14. Difficult probability question

    Hi - I'm really stuck with this question. I can't find any example quite like it anywhere: Two friends, Ben and Jerry, agree to a random swap of...

    Started by Dojo‎, 10-28-2011 10:59 AM
    • Replies: 5
    • Views: 3,267
    10-28-2011, 11:42 AM Go to last post
  15. Conditional prob question - Is my answer correct

    I wondered if someone could confirm my workings... In a certain sports club, 32 % of members play football, 31 % of members play baseball, and 23...

    Started by Dojo‎, 10-28-2011 11:48 AM
    • Replies: 0
    • Views: 1,649
    10-28-2011, 11:48 AM Go to last post
  16. CDF of difference of two independent non-central chi square RVs each 1 d.o.f.

    Hi Everyone. I'm glad to have found this forum. This is my first post. I'm interested in obtaining a simple expression (exact or approximate)...

    Started by rhz‎, 10-28-2011 02:30 PM
    • Replies: 0
    • Views: 1,918
    10-28-2011, 02:30 PM Go to last post
  17. I have a real world problem and need some guidance in solving it.

    Hi, I was hoping someone more knowledgeable than myself might be able to help me out with this. I'd be happy just to be pointed in the right...

    Started by caseym‎, 10-28-2011 03:08 PM
    • Replies: 0
    • Views: 1,735
    10-28-2011, 03:08 PM Go to last post
  18. Bus Paradox

    Please tell me how to solve this question correctly (Q) Buses arrive at a specified stop at 15-minutes intervals starting at 7 a.m. That is, they...

    Started by MTE-11‎, 10-27-2011 04:55 AM
    • Replies: 1
    • Views: 3,470
    10-28-2011, 03:18 PM Go to last post
  19. marginal and conditional density and probability

    Dear all, I really need your help in solving these questions. If X is the amount of money (in dollars) that a salesperson spends on gasoline and...

    Started by sheila‎, 10-22-2011 06:44 AM
    • Replies: 4
    • Views: 3,845
    10-29-2011, 03:23 PM Go to last post
  20. Help with Excell and 1 2 and 3 Standar Deviations

    I was given the following data: 45, 89, 78, 85, 47, 25, 56, 99, 100, 98, 65, 65, 65, 56, 35, 53, 58, 57, 54, 89, 78, 75, 75, 72, 83, 84, 75, 82,...

    Started by Andres0286‎, 10-29-2011 02:42 PM
    • Replies: 1
    • Views: 2,363
    10-29-2011, 05:39 PM Go to last post
  21. method of moments and MLE question

    Hello all, I have a question regarding a problem asking to obtain an estimator for theta using MLE and method of moments and then to compute the...

    Started by romanha1‎, 10-29-2011 06:47 PM
    • Replies: 7
    • Views: 5,618
    10-29-2011, 08:48 PM Go to last post
  22. Probability 101

    Hi from Melbourne. I have a rudimentary probability question that you will probably find amusing but hopefully you can also help me! I am...

    Started by tom‎, 10-30-2011 05:26 PM
    • Replies: 2
    • Views: 2,119
    10-31-2011, 04:16 PM Go to last post
  23. please help with this question related to independence random variable and covariance

    a point is selected at random from the bounded region in the plane between the curves y=x^2 and y=2-x^2. let X be the x-coordinate, and Y be the...

    Started by sonpham‎, 11-01-2011 01:10 PM
    • Replies: 1
    • Views: 2,170
    11-01-2011, 01:30 PM Go to last post
  24. probability of winning with every failed attempt

    Hello, I am trying to figure out what the probability of "losing" on a task is after every failed attempt, where each time there is no evidence of...

    Started by capn‎, 11-01-2011 10:59 AM
    • Replies: 14
    • Views: 2,851
    11-01-2011, 01:36 PM Go to last post
  25. Indicated probability

    What are the steps to arrive at the answer? A bag contains 6 red chips and 11 blue chips. Two chips are selected randomly without replacement from...

    Started by stats_rocks‎, 11-01-2011 03:56 PM
    • Replies: 1
    • Views: 2,259
    11-01-2011, 05:32 PM Go to last post
  26. Sandbagger

    What is the probability of a golfer winning 3 out of 4 golf tournaments? 5 out of 7? 40 players in each tournament, players have USGA handicaps.

    Started by hoppergrass‎, 10-31-2011 04:19 PM
    probability question
    • Replies: 4
    • Views: 2,190
    11-01-2011, 09:45 PM Go to last post
  27. Probability model for random variable

    I'm stumped on this one! You roll a pair of fair dice. If you get a sum greater than 10 you win $50. If you get a double you win $30. If you get a...

    Started by i_am_the_stats_man‎, 11-01-2011 04:00 PM
    • Replies: 1
    • Views: 3,529
    11-02-2011, 03:13 PM Go to last post
  28. Multiple Regression Question

    ..........

    Started by UCFstudent‎, 11-02-2011 03:57 PM
    • Replies: 1
    • Views: 1,785
    11-02-2011, 04:52 PM Go to last post
  29. Probability Help

    Here is the problem: Let X denote the number on a chip drawn at random from an urn containing three chips, numbered 1,2, and 3. Let Y be the...

    Started by gbrunner12‎, 11-02-2011 09:12 PM
    • Replies: 1
    • Views: 2,999
    11-03-2011, 02:04 AM Go to last post
  30. Question Discrete Random Variable Joint Distribution Problem?

    Hello, I am really, really stuck on something that probably should be obnoxiously simple. So I have this problem: Suppose X and Y are...

    Started by infoalisaa‎, 10-30-2011 01:33 PM
    • Replies: 3
    • Views: 3,857
    11-03-2011, 04:01 AM Go to last post
  31. need help with chebyshev, please

    a random variable X has pdf f(x)=(3/2)e^-|3x| -∞ < x < ∞ a. find the mean and variance of X b. use the chebyshev inequality to find a...

    Started by sonpham‎, 11-03-2011 10:55 AM
    • Replies: 1
    • Views: 1,732
    11-03-2011, 10:57 AM Go to last post
  32. stochastic annual survival rate

    Hi all, I want to simulate the trajectories over time of animal populations for which I know the annual survival rate, S, estimated in the field...

    Started by FrogWave‎, 11-03-2011 09:41 PM
    population modeling, stochasticity
    • Replies: 0
    • Views: 1,753
    11-03-2011, 09:41 PM Go to last post
  33. Random Variable/Expected Value Problem (Profit)

    I thought I'd gotten the hang of these, but then the newer problems had different value types that needed to be used. This particular question asks:...

    Started by TR-FIN‎, 11-03-2011 08:47 PM
    • Replies: 2
    • Views: 5,786
    11-03-2011, 11:57 PM Go to last post
  34. Gamma Distribution

    This is my question Suppose that X  Ga(n, L). Show that E = (n(n + 1) . . . (n + k − 1))/(L^k) k , for k a positive integer. I know how to...

    Started by jonnyl‎, 11-04-2011 06:53 AM
    • Replies: 2
    • Views: 3,365
    11-04-2011, 07:29 AM Go to last post
  35. Exponential Family

    Hi! I'm trying to demonstrate that the following distribution is a member of the exponential family. Theta * x^(Theta-1) * exp (-x^Theta) ...

    Started by jamesmartinn‎, 11-03-2011 05:55 PM
    • Replies: 4
    • Views: 4,296
    11-04-2011, 08:29 AM Go to last post
  36. How do I calculate probability using excel?

    I have 8 weeks worth of fantasy football scores from 12 different teams in a MS excel spreadsheet. Each team plays a different team every week. Is it...

    Started by rocky980‎, 11-04-2011 11:56 AM
    • Replies: 3
    • Views: 4,580
    11-04-2011, 12:17 PM Go to last post
  37. Probability mass function for binomial random variable

    I know that the Probability mass function for binomial random variable includes the "combination" formula as opposed to the "permutation formula". ...

    Started by stevedas‎, 10-31-2011 09:04 PM
    • Replies: 1
    • Views: 2,948
    11-04-2011, 12:46 PM Go to last post
  38. Distributive Law P[A u (B n C)]

    I am trying to find a synonymous formula formula for: P = P Can anybody help me? I found somewhere that said it was equal to P but I...

    Started by lancearmstrong1313‎, 11-05-2011 03:27 PM
    • Replies: 4
    • Views: 15,705
    11-05-2011, 04:07 PM Go to last post
  39. Help with an expectation.

    How do i determine: E(Y'Xb|X). I think this is the estimated variance covariance matrix but I'm not sure.

    Started by c2q‎, 11-05-2011 05:03 PM
    • Replies: 3
    • Views: 2,909
    11-06-2011, 03:10 PM Go to last post
  40. Expectation of random vectors.

    Hi there. I'm trying to prove: Cov(X,Y) = E(XY') - E(X)(E(Y))' So i know the cov of 2 random vectors is written by Cov(X,Y) = E can...

    Started by c2q‎, 11-06-2011 02:25 PM
    • Replies: 9
    • Views: 4,996
    11-06-2011, 03:27 PM Go to last post
  41. 2 questions: Finding the optimal value of the mean of a standard normal distribution.

    I have two questions involving the Standard Normal Distribution. The first one involves finding the optimal mean, the second one involves proving...

    Started by APOCooter‎, 11-06-2011 03:27 PM
    • Replies: 1
    • Views: 2,820
    11-06-2011, 04:02 PM Go to last post
  42. Two quick problems:

    Hey guys, having a bit of trouble and can't find anyone to double check my work: Mean failure rate of a communication is 1 error per 10 000 000...

    Started by johnstamos‎, 11-06-2011 06:28 PM
    • Replies: 12
    • Views: 2,632
    11-06-2011, 11:37 PM Go to last post
  43. formula of parabola

    Hi what is formula of parabola? thanks

    Started by asangari‎, 11-07-2011 11:16 AM
    • Replies: 1
    • Views: 2,527
    11-07-2011, 11:19 AM Go to last post
  44. maximum of function?

    Hi who determine maximum of function? thanks

    Started by asangari‎, 11-07-2011 11:22 AM
    • Replies: 1
    • Views: 2,517
    11-07-2011, 11:36 AM Go to last post
  45. maximum of parabola

    Hi who determine maximum of parabola? thanks

    Started by asangari‎, 11-07-2011 11:20 AM
    • Replies: 5
    • Views: 3,433
    11-07-2011, 12:14 PM Go to last post
  46. Beating the odds

    The mortality tables give person 'A' 5 more years to live. He/she dies after 7. The tables give a person more years to live the longer that...

    Started by Outlier‎, 11-07-2011 12:47 PM
    • Replies: 0
    • Views: 1,818
    11-07-2011, 12:47 PM Go to last post
  47. Sample distribution help!!!

    I'm studying for my upcoming stats test and i can't seem to figure out this problem its been bugging me for over an hour now. I thought that i would...

    Started by hray93‎, 11-08-2011 12:51 AM
    central limit theorm, sample distribution
    • Replies: 1
    • Views: 3,417
    11-08-2011, 01:43 AM Go to last post
  48. Confusion with distributions..

    I have the following question and I have no idea how to solve it. 3) The population variance of the distribution for X is 100. Two random samples...

    Started by mmmmxx‎, 11-08-2011 12:37 PM
    • Replies: 6
    • Views: 3,293
    11-09-2011, 02:38 AM Go to last post
  49. expectation value(s) and gaussian stochastic process

    Hi all. I do some calculations including noise described by a random variable \eta\left(t\right) which is gaussian distributed at all instants t ...

    Started by samesheeshdiffday‎, 11-08-2011 03:37 PM
    • Replies: 3
    • Views: 3,545
    11-09-2011, 07:00 AM Go to last post
  50. Consistent Estimator

    I'm new here so i'm not sure what is wrong with my tex (i cant get +)so I will write the correct information under my tex lines A balanced one way...

    Started by alf‎, 11-06-2011 07:10 PM
    • Replies: 4
    • Views: 6,215
    11-09-2011, 11:41 AM Go to last post
  51. What is the meaning of kurtosis?

    I found in Wikipedia that kurtosis is measurement of peakiness of the famous bell curve. If kurtosis is more than 3, it is kind of peaky, if kurtosis...

    Started by insight‎, 12-04-2007 05:30 AM
    • Replies: 10
    • Views: 25,175
    11-09-2011, 12:39 PM Go to last post
  52. probability question

    I have a probability question. It also relates to computer networks but I figured I would try posting it here. The question deals with packets...

    Started by redhawk87‎, 11-09-2011 10:43 PM
    probability
    • Replies: 1
    • Views: 3,257
    11-10-2011, 12:55 AM Go to last post
  53. statistics of sinc function with normal argument

    Hi, Can anyone point me to the pdf, cdf, moments, etc of y = sinc(x) = sin(pi*x)/(pi*x) where x ~ N(0,s^2)? Thanks!

    Started by rhz‎, 11-10-2011 01:21 PM
    • Replies: 0
    • Views: 3,077
    11-10-2011, 01:21 PM Go to last post
  54. CDF of difference of chi squared random variables

    Hi, I posted this question under "Probability Theory" and got no response. Maybe I'd have better luck here? I'm interested in obtaining a...

    Started by rhz‎, 11-10-2011 01:15 PM
    • Replies: 1
    • Views: 8,611
    11-10-2011, 03:50 PM Go to last post
  55. 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: 2,414
    11-11-2011, 05:27 AM Go to last post
  56. A two-outcome game on a limited budget: the probability of being busted over n tries

    Hello, My question does not regard a piece of homework, but I have become stuck trying to solve a statistical problem and I would really...

    Started by smart_mask‎, 11-12-2011 02:43 PM
    binomial distribution, limited budget, two-outcome bet
    • Replies: 2
    • Views: 2,195
    11-13-2011, 03:37 AM Go to last post
  57. A probability confusion

    There are two packs of cards. pack A and pack B. A = {11, 12, 13, 15, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32} B = {11. 13. 15. 21. 22, 35}...

    Started by lihinii‎, 11-13-2011 07:25 PM
    • Replies: 1
    • Views: 2,850
    11-14-2011, 12:03 AM Go to last post
  58. A problem using Bayes Inference

    This is our Master Qualify Exam problem, please help! Thanks! In a large national park, the number of raccoons in a randomly-picked acre is a...

    Started by carfield‎, 11-13-2011 07:30 PM
    • Replies: 1
    • Views: 2,484
    11-14-2011, 12:27 AM Go to last post
  59. 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: 14,490
    11-14-2011, 02:40 AM Go to last post
  60. joint distribution of f(x,y)

    joint distribution f(x,y) = (1/4)xy if 0<x<2, 0<y<2 = 0 otherwise how to find P(XY<2)? I wrote it out as ∫(from 2...

    Started by hphsu‎, 11-14-2011 08:48 PM
    • Replies: 4
    • Views: 3,030
    11-15-2011, 02:21 AM Go to last post

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