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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: 30,224
    09-30-2005, 09:44 AM Go to last post
  1. standard deviation of a ratio of dependent variables

    Hi- I have a function (ratio essentially) r= x / (1-x) I need some way of expressing the error of r ... I've experimentally measured x and...

    Started by tronsister‎, 11-26-2008 04:28 PM
    • Replies: 2
    • Views: 11,877
    11-27-2008, 04:54 AM Go to last post
  2. MLE of a Gamma Distribution

    Hello everyone, I'm having quite some trouble with a question about the maximum likelihood estimator of a gamma distribution. The question is as...

    Started by Halfpixel‎, 11-26-2008 04:44 AM
    • Replies: 2
    • Views: 28,466
    11-26-2008, 01:24 PM Go to last post
  3. uniform distribution

    A bus travels between Glasgow and Edinburgh, which we suppose are 78km apart. If the bus has a breakdown, the distance from breakdown to Glasgow has...

    Started by xixihaha‎, 11-25-2008 06:00 PM
    • Replies: 5
    • Views: 4,891
    11-26-2008, 09:27 AM Go to last post
  4. Probability Question

    I was given 10 problems is my stats class and is having an issue with one. Can someone help me? Suppose n men throw their hats into a pile and...

    Started by tc11‎, 11-05-2008 08:54 PM
    • Replies: 4
    • Views: 2,584
    11-26-2008, 09:02 AM Go to last post
  5. random variables and variance

    if we let X be a (continous or discrete) random variable with range Rx how can we find Var(X)?? i dont have any clue plz help me. thx

    Started by xixihaha‎, 11-25-2008 03:08 PM
    • Replies: 4
    • Views: 3,600
    11-26-2008, 07:00 AM Go to last post
  6. Calculating probability of multiple events

    This is my first post so I hope I can get my question across reasonably intelligently. I have calculated the probability of an event occurring for...

    Started by Bear47‎, 11-18-2008 10:12 AM
    • Replies: 3
    • Views: 13,414
    11-26-2008, 05:24 AM Go to last post
  7. Random Variables

    Haven't a clue where to start with this problem: Leona and Fed are friendly competitors in high school. Both are about to take the ACT college...

    Started by Xiomay‎, 11-25-2008 09:22 PM
    • Replies: 1
    • Views: 6,275
    11-26-2008, 12:49 AM Go to last post
  8. Unhappy test of significance with Poisson Distribution...

    Hello guys, well my problem is the following: I have some data that I have proved that follow the Poisson distribution using chi-squared test. Then...

    Started by nwg‎, 11-24-2008 05:25 AM
    • Replies: 2
    • Views: 6,104
    11-25-2008, 03:46 PM Go to last post
  9. Distribution Probabilities

    Here's my question with what I have done so far.. Guess I'm looking to know if I am on the right track - thanks in advance A completely confuses...

    Started by s2008‎, 11-24-2008 09:55 AM
    • Replies: 2
    • Views: 2,567
    11-24-2008, 10:18 PM Go to last post
  10. Normal distribution

    Hey guys, was wondering if you guys could help me out with this, been ok so far with my Stats at Uni but not sure what to do with these examples, can...

    Started by StatsUniStudent‎, 11-20-2008 06:20 PM
    • Replies: 2
    • Views: 2,242
    11-23-2008, 10:01 PM Go to last post
  11. looking for algorithm for weighted random choice

    The subject line probably doesn't quite call it what it's supposed to be called but, anyway, here's the problem: Just for the sake of argument,...

    Started by m3p‎, 11-22-2008 03:33 PM
    • Replies: 1
    • Views: 4,801
    11-23-2008, 01:02 PM Go to last post
  12. k-sided dice

    Hi everyone, Looking for a bit of help. If i throw a k-sided dice twice, what is the expected value of their sums. I'm looking for a formula for...

    Started by waxandshine‎, 11-22-2008 06:39 AM
    • Replies: 2
    • Views: 2,713
    11-22-2008, 08:40 PM Go to last post
  13. Probability of exactly one?

    Hello, I have a question that I am stuck on. Given: the probability of passing a Photography class is 75% and the probability of passing a...

    Started by vit_mar‎, 11-19-2008 06:40 PM
    • Replies: 9
    • Views: 8,083
    11-21-2008, 07:29 AM Go to last post
  14. Please help me reach the end!

    Before ya slam me let me explain. I foolishly took an online statistics course. I will be failing this class... there is nothing I can do to avoid it...

    Started by MotherBear1975‎, 11-20-2008 02:52 PM
    • Replies: 3
    • Views: 5,665
    11-20-2008, 03:37 PM Go to last post
  15. Angry Statistic & Probability

    I am having problems completing assignment of 8 problems. I do not know what I am doing and I need this course to graduate in the spring. I would be...

    Started by annharris‎, 11-18-2008 02:50 PM
    • Replies: 1
    • Views: 2,946
    11-20-2008, 03:00 PM Go to last post
  16. Probability question- Are my answers correct

    Question: You are given the probabilities given below: P(A)=0.30 P(B)=0.40 P(C)=0.10 P(A or D)=0.50 P(A and D)=0.04 P(A and C)=0.03...

    Started by sweetx‎, 11-19-2008 11:32 PM
    • Replies: 0
    • Views: 2,555
    11-19-2008, 11:32 PM Go to last post
  17. I really need some small help here please.

    Hey everybody I am new here one of my friends refered me to these forums as help. SO i have 2 small problems that i will write down right now. I...

    Started by odessa101‎, 11-18-2008 08:16 PM
    • Replies: 1
    • Views: 2,894
    11-19-2008, 09:28 AM Go to last post
  18. Question Question: generalization for negative binomial random variable

    Hello, I wonder if there is a know random variable which is a generalization of the negative binomial random variable. The generalization I search...

    Started by twy‎, 11-16-2008 05:48 PM
    • Replies: 0
    • Views: 2,353
    11-16-2008, 05:48 PM Go to last post
  19. Probability model on common cold

    Here is a probabilistic model for the spread of the common cold. We have two people in a room, one of them healthy, and immune, the other sick....

    Started by bakakage‎, 11-13-2008 10:33 PM
    • Replies: 0
    • Views: 2,322
    11-13-2008, 10:33 PM Go to last post
  20. Squared Normal Dist

    Hello All- My problem is: Find the distribution of W=X^2 when X is N(0,4) I know that this problem is related to the fact that Z^2 =...

    Started by B_Miner‎, 11-07-2008 09:30 PM
    • Replies: 2
    • Views: 3,234
    11-13-2008, 07:40 PM Go to last post
  21. Exclamation DeMorgans Law

    I NEED DESPRETE HELP! I'M GONNA FAIL MY CLASS IF I DON'T GET THE ANSWERS RIGHT! PLEASEEE! Heres the problem: A local TV station predicts a 80%...

    Started by bettyboop1991‎, 11-13-2008 06:31 PM
    • Replies: 0
    • Views: 2,063
    11-13-2008, 06:31 PM Go to last post
  22. Somebody please verify the solution i have posted, am not 100% sure

    A telecom produces telephone sets in two plants: New York, and Buffalo. Daily production volumes of a certain model are : 500 and 2000 units...

    Started by messanger123434‎, 11-13-2008 12:39 PM
    • Replies: 1
    • Views: 2,079
    11-13-2008, 04:39 PM Go to last post
  23. Please help with computing expectation!

    I have trouble with the following two questions concerning expectations, can anyone give me a hint? Question 1) Suppose there are k=10 types of...

    Started by yellowrose2011‎, 11-11-2008 01:43 PM
    • Replies: 5
    • Views: 3,898
    11-13-2008, 03:15 PM Go to last post
  24. Estimation problem, please help

    Here is my problem. I need to estimate a ramdom variable h with a chi-square distribution, that is, h= x^2+y^2 with x and y gaussian. The observed...

    Started by Jorge‎, 11-13-2008 01:25 PM
    • Replies: 0
    • Views: 2,336
    11-13-2008, 01:25 PM Go to last post
  25. Complicated STATs problem

    Say I have five variables A, B, C, D and E that range anywhere from -11 to 11. Given that A,B,C and D occur before E and there is correlation,...

    Started by senthil196‎, 11-13-2008 12:58 PM
    • Replies: 0
    • Views: 2,681
    11-13-2008, 12:58 PM Go to last post
  26. Unidentified Distribution

    I am working on a project and need help identifying a distribution. My work is attached. Any help in identification would be appreciated....

    Started by statsmom‎, 11-12-2008 01:24 PM
    • Replies: 0
    • Views: 1,643
    11-12-2008, 01:24 PM Go to last post
  27. Parametric Test on Ordinal Data

    Hi to everybody, can I used a parametric test to compare, for example, two independent samples when these samples contain ordinal data and are...

    Started by Canyon75‎, 11-12-2008 11:17 AM
    • Replies: 0
    • Views: 3,202
    11-12-2008, 11:17 AM Go to last post
  28. Question Cereal Prizes

    Hi, I'm stumped on a probability question. Here's the situation...a cereal company gives away 3 different prizes in its boxes of cereal, with...

    Started by M_Brando‎, 11-10-2008 04:17 PM
    • Replies: 7
    • Views: 3,804
    11-11-2008, 07:39 PM Go to last post
  29. Please help me on a really easy probability question -_-

    I dont know why I cant get this, i know its not hard. Id really appreciate it if someone could clear this up for me =( If there are 72 multiple...

    Started by dvm‎, 11-10-2008 10:05 PM
    • Replies: 7
    • Views: 2,406
    11-11-2008, 12:16 PM Go to last post
  30. HElp

    3. (15 points / 3 points each) Wait time for a taxi outside Penn Station in New York City is uniformly distributed on the interval (0, 420) where...

    Started by steward@comcast.net‎, 11-09-2008 03:03 PM
    • Replies: 1
    • Views: 1,623
    11-09-2008, 03:31 PM Go to last post
  31. Probability question -- T Distribution

    You are the head of the Amex card group. Nationally, the credit card default rate is at 12% A random sample of 25 Amex card holders shows a default...

    Started by messanger123434‎, 11-06-2008 06:08 PM
    • Replies: 3
    • Views: 2,641
    11-08-2008, 08:54 AM Go to last post
  32. Random Thoughts?

    This is a question I am thinking through and just need some input as to whether I am reasoning correctly. I have never thought of the sample mean as...

    Started by statsmom‎, 11-07-2008 01:13 PM
    • Replies: 3
    • Views: 1,882
    11-08-2008, 12:10 AM Go to last post
  33. Questions need help!!

    Weekly demand for packs of a certain make of chocolate trifle at a major supermarket store has a Normal distribution with mean of 200 and standard...

    Started by zxadriano‎, 11-07-2008 07:03 AM
    • Replies: 0
    • Views: 2,249
    11-07-2008, 07:03 AM Go to last post
  34. Transformation of Y = 1/X

    X ~ U(2,4). Find the density of Y = 1/x f(x) = (1/2, 2<x<4) (0,elsewhere) G(Y) = P(Y<y) = P(1/X<y) = P(X>1/Y) = 1 -...

    Started by jamesmartinn‎, 11-06-2008 08:56 PM
    • Replies: 3
    • Views: 6,580
    11-07-2008, 06:45 AM Go to last post
  35. Sampling marbles

    I have an urn containing N marbles: M white marbles and N-M black marbles. From this urn, I need to grab a handful of marbles (n) and figure out...

    Started by Rothko‎, 11-06-2008 06:51 PM
    • Replies: 0
    • Views: 2,547
    11-06-2008, 06:51 PM Go to last post
  36. 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: 5,487
    11-06-2008, 06:03 PM Go to last post
  37. uniform dist. parameter est.

    Here is the problem: Use MLE to estimate the parameters of the two parameter uniform pdf f_Y_(y;theta1,theta2)=1/(theta2-theta1);...

    Started by anna_s‎, 11-05-2008 09:32 PM
    • Replies: 1
    • Views: 2,571
    11-06-2008, 02:08 PM Go to last post
  38. zmoggggg -- Continuation of Poisson question, please verify and advise

    ok so lambada value here =4 (Average of 240 planes in 1 hr) and for the following question a) atleast 1 plane arrives during the 10-minute...

    Started by sahilkthr‎, 11-06-2008 11:37 AM
    • Replies: 2
    • Views: 2,165
    11-06-2008, 01:50 PM Go to last post
  39. Help please! The sum of two rolling die

    hey! Does anyone know how to do this question: "You keep rolling a die until either: 1. The sum of the two die is equal to 7, twice 2. A 6...

    Started by michelle1010‎, 10-01-2008 11:01 PM
    • Replies: 3
    • Views: 2,993
    11-06-2008, 11:24 AM Go to last post
  40. Help! First time taking Stats and soooo confused!

    I'm taking Statistics online and every week I can barely get through the assigned problems. I'm not sure how to even begin figuring out this...

    Started by Midnightedge21‎, 10-19-2008 01:05 PM
    • Replies: 12
    • Views: 5,439
    11-06-2008, 09:53 AM Go to last post
  41. Please help me i need help

    have a couple of questions on my hw that I cannot figure out please help me A) Find P(Z=0) B) Find the z-score that separates the bottom...

    Started by steward@comcast.net‎, 11-05-2008 09:58 PM
    • Replies: 2
    • Views: 2,688
    11-06-2008, 09:23 AM Go to last post
  42. Can anybody help me with this probability question?

    helpneeeded

    Started by sahilkthr‎, 11-05-2008 03:42 PM
    • Replies: 4
    • Views: 2,290
    11-06-2008, 02:24 AM Go to last post
  43. Help

    I have a couple of questions on my hw that I cannot figure out please help me A) Find P(Z=0) B) Find the z-score that separates the bottom...

    Started by steward@comcast.net‎, 11-05-2008 09:09 PM
    • Replies: 0
    • Views: 1,781
    11-05-2008, 09:09 PM Go to last post
  44. Regression Control Chart

    I have a project that needs to plot to regression control chart. Can anyone tell me which statistical software I can use for this purpose? Thanks a...

    Started by hollybuddy‎, 11-05-2008 08:51 PM
    • Replies: 0
    • Views: 2,678
    11-05-2008, 08:51 PM Go to last post
  45. 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: 2,869
    11-05-2008, 04:19 PM Go to last post
  46. Please help with stats problem

    I need help with part of a problem in my Stats book. There are four parts to the problem, and I understand how to do the other three parts, I'm just...

    Started by lizard_14256‎, 11-05-2008 06:54 AM
    • Replies: 2
    • Views: 4,376
    11-05-2008, 10:41 AM Go to last post
  47. Poisson Process

    Hello, Have a task I cant solve; incomming calls to a central follows a poisson process with λ > 0, infinity capasity, and all calls are taken...

    Started by RicoQQ‎, 11-03-2008 04:14 AM
    • Replies: 3
    • Views: 3,952
    11-05-2008, 04:45 AM Go to last post
  48. random variables

    Question: The number of littly, teeny raisins (x) in a box of a popular brand of raisin bran cereal has a distribution with mean 280 and s.d. 25....

    Started by letsstophere‎, 11-04-2008 12:32 PM
    • Replies: 3
    • Views: 3,808
    11-04-2008, 10:41 PM Go to last post
  49. Percentile of a Poisson variable

    Hi, How can I find the 90th percentile of a Poisson random variable with lamba = 0.4 ? I tried: e-0.4 (0.4^.90) / 0.9! but this gives...

    Started by Silvanus‎, 11-03-2008 12:17 AM
    • Replies: 3
    • Views: 5,083
    11-03-2008, 04:16 PM Go to last post
  50. generalized gamma distribution random numbers

    Hi there, Does anyone know how to generate random numbers from the generalized gamma distribution?? If you want to check the density take a look...

    Started by leo nidas‎, 11-03-2008 07:26 AM
    • Replies: 1
    • Views: 4,438
    11-03-2008, 07:38 AM Go to last post
  51. Reliability of a system with parallel components

    Hi, Consider this q.: If all 3 components in a parallel system function independently of one another, and the reliability at time t of the ith...

    Started by Silvanus‎, 11-03-2008 12:22 AM
    • Replies: 2
    • Views: 6,058
    11-03-2008, 03:02 AM Go to last post
  52. Derivative help

    I am having a problem completing a problem because of derivatives. I complete the work down to the part where I get lnL(theta) =nln(theta)- sum...

    Started by statsmom‎, 11-02-2008 12:01 AM
    • Replies: 7
    • Views: 2,683
    11-02-2008, 03:59 PM Go to last post
  53. 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: 9,290
    11-02-2008, 03:56 PM Go to last post
  54. probability of a machine failure at a certain hour of the day

    Hello folks. I look after some servers at work, one of which is intermittently failing. In the 38 days since I set up monitoring, there have been ten...

    Started by oregano‎, 11-01-2008 02:37 PM
    • Replies: 2
    • Views: 4,605
    11-02-2008, 12:49 PM Go to last post
  55. goodness of fit , 1 sided or 2 sided?

    Hello everyone, I am reading about " accuracy " of the Chi squared test. Now we have the following : - P( X=i ) = 1/6 for all i = 1(1)n ...

    Started by ashim‎, 11-02-2008 10:14 AM
    • Replies: 1
    • Views: 3,451
    11-02-2008, 11:24 AM Go to last post
  56. Is this 2 sided or a 1 sided test

    Hello everyone! I am new to Hyposthesis Testing. Suppose my H_0 ( Null Hypothesis ) is : mu =1 I understand that H_1 : mu >1 or H_1 mu<1 are...

    Started by ashim‎, 11-01-2008 10:27 PM
    • Replies: 2
    • Views: 4,019
    11-01-2008, 11:44 PM Go to last post
  57. Weird Probability Problem

    Hi, I'm having trouble with a problem assigned by my teacher that reads: "Assume that you are boarding a flight in which there are five seats and...

    Started by Addlift‎, 10-28-2008 10:14 PM
    • Replies: 5
    • Views: 6,408
    11-01-2008, 03:49 PM Go to last post
  58. Not a problem, but an opinion about a book

    I am currently taking a class called Probability/Math Statistics I. We are using a book called Probability and Statistics with Applications. It is...

    Started by pensfan10‎, 10-30-2008 04:22 PM
    • Replies: 4
    • Views: 2,095
    11-01-2008, 10:39 AM Go to last post
  59. Selecting K numbers from N=10^L where group of same prefix exists

    Hello all, I cannot solve following problem. Lets have a phone numbers of the length L. Number of phone numbers is N=10^L. What is the...

    Started by ieee‎, 10-29-2008 07:59 AM
    • Replies: 5
    • Views: 2,758
    10-30-2008, 01:04 PM Go to last post
  60. Tough probability question...

    We are supposing that the proportion of all adults who think that two children is ideal is p = 0.49. What is the probability that a sample proportion...

    Started by PunPride‎, 10-29-2008 02:48 AM
    • Replies: 2
    • Views: 2,512
    10-29-2008, 01:14 PM Go to last post

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