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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: 30,222
    09-30-2005, 09:44 AM Go to last post
  1. 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: 3,546
    11-09-2011, 07:00 AM Go to last post
  2. 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
  3. 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: 3,419
    11-08-2011, 01:43 AM Go to last post
  4. 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: 1,822
    11-07-2011, 12:47 PM Go to last post
  5. maximum of parabola

    Hi who determine maximum of parabola? thanks

    Started by asangari‎, 11-07-2011 11:20 AM
    • Replies: 5
    • Views: 3,436
    11-07-2011, 12:14 PM Go to last post
  6. 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
  7. formula of parabola

    Hi what is formula of parabola? thanks

    Started by asangari‎, 11-07-2011 11:16 AM
    • Replies: 1
    • Views: 2,529
    11-07-2011, 11:19 AM Go to last post
  8. 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: 2,635
    11-06-2011, 11:37 PM Go to last post
  9. 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: 2,827
    11-06-2011, 04:02 PM Go to last post
  10. 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: 4,997
    11-06-2011, 03:27 PM Go to last post
  11. 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: 2,914
    11-06-2011, 03:10 PM Go to last post
  12. 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: 15,720
    11-05-2011, 04:07 PM Go to last post
  13. 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: 2,951
    11-04-2011, 12:46 PM Go to last post
  14. 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: 4,587
    11-04-2011, 12:17 PM Go to last post
  15. 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: 4,301
    11-04-2011, 08:29 AM Go to last post
  16. 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: 3,381
    11-04-2011, 07:29 AM Go to last post
  17. 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: 5,790
    11-03-2011, 11:57 PM Go to last post
  18. 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: 1,756
    11-03-2011, 09:41 PM Go to last post
  19. 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
  20. 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
  21. 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: 3,001
    11-03-2011, 02:04 AM Go to last post
  22. Multiple Regression Question

    ..........

    Started by UCFstudent‎, 11-02-2011 03:57 PM
    • Replies: 1
    • Views: 1,792
    11-02-2011, 04:52 PM Go to last post
  23. 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: 3,532
    11-02-2011, 03:13 PM Go to last post
  24. 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: 2,192
    11-01-2011, 09:45 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: 2,261
    11-01-2011, 05:32 PM Go to last post
  26. 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: 2,854
    11-01-2011, 01:36 PM Go to last post
  27. 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: 2,176
    11-01-2011, 01:30 PM Go to last post
  28. 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: 2,125
    10-31-2011, 04:16 PM Go to last post
  29. 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: 5,624
    10-29-2011, 08:48 PM Go to last post
  30. 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: 2,365
    10-29-2011, 05:39 PM Go to last post
  31. 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: 3,846
    10-29-2011, 03:23 PM Go to last post
  32. 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: 3,475
    10-28-2011, 03:18 PM Go to last post
  33. 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: 1,738
    10-28-2011, 03:08 PM Go to last post
  34. 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: 1,921
    10-28-2011, 02:30 PM Go to last post
  35. 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: 1,653
    10-28-2011, 11:48 AM Go to last post
  36. 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: 3,268
    10-28-2011, 11:42 AM Go to last post
  37. 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: 3,438
    10-28-2011, 07:42 AM Go to last post
  38. 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: 1,747
    10-27-2011, 08:02 AM Go to last post
  39. 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: 2,632
    10-27-2011, 04:52 AM Go to last post
  40. 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: 3,612
    10-27-2011, 04:48 AM Go to last post
  41. 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
  42. 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: 6,178
    10-26-2011, 09:10 PM Go to last post
  43. 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: 2,438
    10-26-2011, 12:04 PM Go to last post
  44. 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: 2,233
    10-26-2011, 11:23 AM Go to last post
  45. 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: 3,523
    10-25-2011, 11:49 PM Go to last post
  46. 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
  47. 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: 2,664
    10-25-2011, 02:57 PM Go to last post
  48. 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: 4,394
    10-25-2011, 02:35 AM Go to last post
  49. 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
  50. 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: 5,855
    10-24-2011, 03:01 PM Go to last post
  51. Three shooters, probability that two of them hits

    I have a little problem. There are three shooters ( i= 1,2,3) and they hit the target with probabilities P(A1) = 1/2, P(B1) = 2/3, P(A3) = 3/4....

    Started by 8Julio‎, 10-20-2011 01:26 PM
    • Replies: 14
    • Views: 5,217
    10-24-2011, 01:18 AM Go to last post
  52. Factorials

    How would I solve this problem? If I roll a fair die 4 times. X is the number of times 1 or 2 are observed in 4 rolls. What is the minimum number...

    Started by Caggy9702‎, 10-23-2011 07:06 PM
    math, probability, statistics
    • Replies: 6
    • Views: 2,012
    10-23-2011, 08:33 PM Go to last post
  53. Independent Event if A is a subset of B ???

    I have a questions regarding Conditional Probability. Two events A and B are independent if: P(AnB)=P(A)*P(B) Is this always the case or are...

    Started by Mats Marquardt‎, 10-23-2011 12:27 PM
    independent events
    • Replies: 5
    • Views: 15,766
    10-23-2011, 04:55 PM Go to last post
  54. Binominal vs Geometric.....confused!!!!

    Hi there, I am currently working on these questions but I don't really get how to work them out. Is it wrong to use the binomial distribution for a)...

    Started by mmmmxx‎, 10-23-2011 01:13 PM
    binominal
    • Replies: 0
    • Views: 3,804
    10-23-2011, 01:13 PM Go to last post
  55. At least n of

    Consider a genetic mutation. For anyone that has this mutation, there is a 50% probability their child(ren) will also have it. If the child has the...

    Started by jonathannah‎, 10-21-2011 12:25 AM
    • Replies: 3
    • Views: 2,015
    10-21-2011, 12:14 PM Go to last post
  56. Sample Space of Beta Distribution.

    I was wondering something about the Sample Space of the Beta Distribution. this holds for 0 < x < 1 and a,B > 0. And the Sample Space would be...

    Started by Mkkl‎, 10-21-2011 07:20 AM
    • Replies: 3
    • Views: 3,099
    10-21-2011, 10:59 AM Go to last post
  57. normal approx / continuity correction

    One statistic used to assess professional golfers is driving accuracy, the percent of drives that land in the fairway. Driving accuracy for PGA...

    Started by tahiti323‎, 10-20-2011 10:27 PM
    • Replies: 2
    • Views: 4,219
    10-21-2011, 10:37 AM Go to last post
  58. Chi Square Test-Who's correct? Me or Prof

    You are instructed to prepare 3 different types of pastry, all containing 16 blueberries per pastry. 6 customers approach you to complain that there...

    Started by jnorm2005‎, 10-20-2011 04:58 PM
    • Replies: 1
    • Views: 3,188
    10-20-2011, 05:25 PM Go to last post
  59. Likelihood Function.

    Hi guys, i have this problems and I need some help to solve it: Optional problem : 1. Let Y be a Bernoulli random variable with parameter p. You...

    Started by Jim85‎, 10-20-2011 12:54 PM
    • Replies: 2
    • Views: 3,854
    10-20-2011, 01:40 PM Go to last post
  60. Homework Help with continuous probability distributions

    Hi if anyone can help me on these two problems, i would really appreciate it. i'm looking at my notes and txtbook, but still don't understand it. ...

    Started by Linda Yang‎, 10-19-2011 11:17 PM
    exponential continous
    • Replies: 1
    • Views: 7,941
    10-19-2011, 11:52 PM Go to last post

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