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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: 30,206
    09-30-2005, 09:44 AM Go to last post
  1. Lightbulb Can you really solve for an MLE given a fictitious distributi

    to estimate MLE, you need more than one observation, right? What if you don't have a density function? (It's a fictitious disitrubtion)

    Started by idejstark‎, 03-25-2010 09:01 PM
    • Replies: 3
    • Views: 2,446
    04-09-2010, 09:09 AM Go to last post
  2. probability space

    hi, I need some help with this one.... Let \Omega be a finite set. Show that the set of all subsets of \Omega (2^omega), is also finite and...

    Started by WeeG‎, 04-08-2010 03:23 AM
    • Replies: 1
    • Views: 2,552
    04-08-2010, 12:41 PM Go to last post
  3. Please help. This is impossible. Please!

    Please help me answer these. They are due by midnight and I am totally lost. Please. I need to pass this class. Thanks in advance. You can see...

    Started by BGAndrea‎, 03-06-2010 08:41 AM
    • Replies: 3
    • Views: 3,387
    04-07-2010, 01:02 AM Go to last post
  4. disctrete or cumulative ??

    0 if x <2 0.7 if 2 <= x < 2.5 F(x) = 0.8 if 2.5 <= x < 3 1 if x => 3 from first sight i think that this is a...

    Started by pure_zero‎, 04-06-2010 07:40 PM
    • Replies: 2
    • Views: 2,252
    04-07-2010, 12:50 AM Go to last post
  5. help with 2 r.v. normal distribution problem

    Hi all, so my question has to do with 2 r.v. and normal distribution. X: mean = 5000, standard deviation = 100 Y: mean = 5200, standard...

    Started by pww‎, 03-08-2010 04:15 PM
    • Replies: 8
    • Views: 5,548
    04-06-2010, 08:54 PM Go to last post
  6. what is a log normal?

    Hi there, I have a question regarding the log normal and normal distribution. What I think is that if Y has a normal distribution then X=log(Y)...

    Started by leo nidas‎, 04-06-2010 04:29 AM
    • Replies: 2
    • Views: 4,610
    04-06-2010, 09:11 AM Go to last post
  7. Calculatng an event

    Find the probability that contains the event A but not event B. P(A) = 0.15, P(B) = 0.05, P(A or B) = 0.17 I thought I could use P(A or B) - P(B)...

    Started by SmileAli‎, 04-02-2010 04:49 PM
    • Replies: 1
    • Views: 2,322
    04-05-2010, 03:40 AM Go to last post
  8. Question How to show that this is chi-square distribution?

    I have something like 2 Sum from i=1 to n {X^2 / Theta^2} where X is Wei(Theta,2) it is distributed chi-square 2n but I do not know where to start....

    Started by grl‎, 04-03-2010 05:45 PM
    • Replies: 1
    • Views: 4,862
    04-05-2010, 03:21 AM Go to last post
  9. Finding the Probability

    Hi I just have a quick question, and just want to know if I did the question right :) A organization contains 2 events, E and T. The organization...

    Started by SmileAli‎, 04-02-2010 02:01 PM
    • Replies: 1
    • Views: 4,132
    04-02-2010, 02:09 PM Go to last post
  10. short question measurable function?

    Hi there, All numbers, "N", "n" and "t-1" are subscripts: Let the data Z0, Z1, ..., ZN be the data we have. Let Fn=σ(Ζ0, Ζ1, ... Ζn). θ is...

    Started by leo nidas‎, 04-02-2010 05:08 AM
    • Replies: 0
    • Views: 2,243
    04-02-2010, 05:08 AM Go to last post
  11. Probability

    An object has probability 0.10 of being defective. i) If a sample of 100 objects is drawn, exactly 10 will be defective. True, because its 100 X...

    Started by SmileAli‎, 03-31-2010 03:00 PM
    • Replies: 1
    • Views: 2,848
    04-01-2010, 10:44 AM Go to last post
  12. Direction please

    What statisics to I need to use work out the probability of seeing a dolphin given that it has been seen before? i.e. If it was seen once, will it...

    Started by Carolinew77‎, 03-27-2010 10:12 PM
    • Replies: 1
    • Views: 2,472
    03-28-2010, 06:25 PM Go to last post
  13. HELP PLEASE! Normal Probability Question.

    So I have a quick question. I was able to figure part A out (i think) but I don't think my answer for part B is correct... The daily dinner bills...

    Started by will023‎, 03-27-2010 04:12 PM
    • Replies: 2
    • Views: 7,603
    03-27-2010, 05:13 PM Go to last post
  14. Question about 68-95-99.7 rule

    Suppose that 60% of all students at a large University access course information using the internet. There is a 68% chance that the sample...

    Started by JasonStats‎, 03-24-2010 06:06 PM
    • Replies: 1
    • Views: 5,352
    03-25-2010, 09:18 AM Go to last post
  15. Probability problem

    An airline has 500 places for a flight. However, due to only 95% of reservations being taken the airline usually overbooks by 20 places. When the...

    Started by ryan90‎, 03-23-2010 09:15 AM
    • Replies: 4
    • Views: 3,104
    03-23-2010, 01:25 PM Go to last post
  16. Please recommend a book that blends research methodology and statistics

    Hi, Over the past few months, I've went over an introductory statistics text along with some multivariate stuff. I'd like to now design...

    Started by Kovacs‎, 03-20-2010 04:46 PM
    • Replies: 3
    • Views: 3,950
    03-22-2010, 10:56 AM Go to last post
  17. product of sequences converging in probability

    Hi, I'm stuck on the following problem: Show that if X_n -> X in probability and Y_n -> Y in probability then (X_n)(Y_n) -> XY in probability. ...

    Started by mnt‎, 03-21-2010 09:53 PM
    • Replies: 1
    • Views: 4,284
    03-22-2010, 10:40 AM Go to last post
  18. Question Terribly confused-binomial distribution & profit

    Would someone kindly take a look at this problem? The link is to the book page in google books. (it is a long problem). I seem to have parts 1 and 2...

    Started by debsbaby‎, 03-22-2010 08:19 AM
    • Replies: 0
    • Views: 2,180
    03-22-2010, 08:19 AM Go to last post
  19. Prove finite expectation value

    Hallo, I've got a problem with a proof: I should prove that a r.v. X (>=0) has a finite expectation value iff sum_{i>=1}P(X>i) is finite. I...

    Started by someone‎, 03-20-2010 11:31 AM
    • Replies: 1
    • Views: 5,620
    03-20-2010, 12:48 PM Go to last post
  20. Gaming Problem

    This is probably a trivial problem -- but it has me stumped. I'm doing a simulation of a roulette game and trying to calculate probability (no...

    Started by SWATS‎, 03-20-2010 12:45 PM
    • Replies: 0
    • Views: 2,494
    03-20-2010, 12:45 PM Go to last post
  21. Expected value of ratio: please help!

    Hello, I am trying to find an unbiased estimator for E(X/Y), where X is Normal(mu_1,sigma_1) and Y is Normal (mu_2,sigma_2). Does anyone happen...

    Started by jmill40000‎, 03-19-2010 02:49 PM
    • Replies: 1
    • Views: 5,799
    03-19-2010, 04:38 PM Go to last post
  22. conditional probability

    hi, well i've just started to mess around the probabilities and the problem i don't understand is : if a probability for a person to finish his...

    Started by cro77‎, 03-03-2010 02:21 PM
    • Replies: 2
    • Views: 2,242
    03-19-2010, 02:40 AM Go to last post
  23. Probability density function

    I'm having trouble with the continuous distribution. I can verify that f(x) satisfies the requirements for the uniform random variable X and find...

    Started by jonny‎, 03-17-2010 03:40 PM
    • Replies: 2
    • Views: 3,583
    03-17-2010, 04:11 PM Go to last post
  24. Need some guidance!!!

    I just need my work verified for the problem below. Any help/guidance is much appreciated. A faculty member can be either an assistant professor,...

    Started by canon14‎, 03-16-2010 12:08 PM
    • Replies: 0
    • Views: 3,611
    03-16-2010, 12:08 PM Go to last post
  25. zero inflated poisson distribution

    I am new and I hope I'm abiding to the rules. I just wanted to know what exactly a zero inflated Poisson distribution is? How is it related to the...

    Started by mekhi‎, 03-16-2010 05:32 AM
    • Replies: 2
    • Views: 6,382
    03-16-2010, 09:21 AM Go to last post
  26. Do you recognize this distribution?

    I'm pondering the probabilities involved in playing a certain fantasy wargame. For the most part, this game works on a dice pool mechanic can be...

    Started by Bargle‎, 03-15-2010 11:17 PM
    • Replies: 0
    • Views: 2,038
    03-15-2010, 11:17 PM Go to last post
  27. stage 1 probability question

    hey i know that this might seem like a really easy question for you guys :( but here goes: well there are 10 six sided dice, all independent. what...

    Started by pure_zero‎, 03-13-2010 01:59 AM
    • Replies: 3
    • Views: 3,394
    03-15-2010, 07:44 PM Go to last post
  28. Machines fail randomly once a month on average.

    With one machine how long do I have to wait, on average, for a failure? I don't know when the last failure was. How long for the first failure...

    Started by Outlier‎, 03-14-2010 04:46 PM
    • Replies: 4
    • Views: 2,437
    03-15-2010, 09:55 AM Go to last post
  29. correlated binary variables

    I have the following problem: let X = {x_i}, and Y = {y_i} be two vectors of binary variables with n elements (taking the value 0 or 1 with some...

    Started by torkel‎, 03-11-2010 02:01 PM
    • Replies: 2
    • Views: 4,137
    03-12-2010, 03:56 AM Go to last post
  30. weighted averages and binomials(i think)

    consider a multiple choice exam with 50 questions. a student who has gone to class and done homework has a 75% probability of answering any...

    Started by grizzle‎, 03-11-2010 06:30 PM
    • Replies: 0
    • Views: 1,882
    03-11-2010, 06:30 PM Go to last post
  31. Combining random variables, squared

    Been sitting with this for a while, and hoping wome of you can assist me. I'm given a pdf f(y) = 6y(1-y) for 0<y<1, and I want to calculate the pdf...

    Started by Chub‎, 03-11-2010 07:00 AM
    • Replies: 2
    • Views: 6,225
    03-11-2010, 12:45 PM Go to last post
  32. Question How to calculate the number of samples?

    Our company receives wires which are manufactured to our spec in lot sizes that range between 2000 to 20000 wires at a time. These wires should be...

    Started by ffn884‎, 03-08-2010 11:24 AM
    • Replies: 4
    • Views: 9,564
    03-09-2010, 05:11 AM Go to last post
  33. exact probability, two random variables, normal distribution

    Hi, I've been stuck on this problem for awhile: The problem asks to find the exact probability that X will last longer than Y. It says that on...

    Started by pww‎, 03-08-2010 04:29 PM
    • Replies: 3
    • Views: 6,489
    03-08-2010, 10:30 PM Go to last post
  34. Post About the definition of random correspondence

    I have a question:"Is there a concepte and a definition on random correspondence in the current Probability Theory?" If there is, how is it...

    Started by LigongKarlChen‎, 03-08-2010 11:17 AM
    • Replies: 0
    • Views: 2,583
    03-08-2010, 11:17 AM Go to last post
  35. Numerical frequency analysis query

    Hi, I heard about this on radio 4 (UK) back in 2007. A statistical method whereby the frequency of integers in a dataset is calculated, then...

    Started by bamie9l‎, 03-08-2010 07:52 AM
    • Replies: 0
    • Views: 2,420
    03-08-2010, 07:52 AM Go to last post
  36. How to draw tree diagram

    I have the following problem from my home problem. An oil-prospecting firm hits oil or gas on 10% of its drillings. If the firm drills two wells,...

    Started by Angel_lis‎, 03-07-2010 02:39 PM
    • Replies: 1
    • Views: 6,481
    03-07-2010, 05:53 PM Go to last post
  37. Upper bound for the probability one random variable will be greater than another

    Hi Everyone! Just came across this forum a few weeks ago and have already gotten some great use out of it. Just want to say thanks to all the really...

    Started by reddavies‎, 03-07-2010 05:55 AM
    • Replies: 2
    • Views: 6,726
    03-07-2010, 11:33 AM Go to last post
  38. Probability Problem Set

    1. It takes five people working on different tasks to produce a new product. A small workplace has five different workers and the plant manager...

    Started by ilovepsycho‎, 03-07-2010 09:08 AM
    • Replies: 0
    • Views: 2,170
    03-07-2010, 09:08 AM Go to last post
  39. Need help with probability questions

    Democrat Republican Independent Total Male 346 125 24 495 Female 404 ...

    Started by Angel_lis‎, 03-06-2010 11:45 AM
    • Replies: 2
    • Views: 2,759
    03-06-2010, 02:44 PM Go to last post
  40. Conditional expectation question

    Hey, I would really appreciate your help with the following question: X and Y each has a uniform distribution on and the two are independent....

    Started by busstud123‎, 03-01-2010 12:10 PM
    • Replies: 8
    • Views: 5,394
    03-06-2010, 02:46 AM Go to last post
  41. Power large Sample Standardized?

    This is probably staring me in the face, but my face has been staring at it for many hours ... ;) In basic power analysis of a mean, using the...

    Started by B_Miner‎, 03-03-2010 08:50 PM
    • Replies: 1
    • Views: 2,215
    03-03-2010, 10:11 PM Go to last post
  42. ball game

    sorry I got it now, thanks, can someone delete this for me?

    Started by initialize‎, 03-02-2010 09:11 PM
    • Replies: 0
    • Views: 2,993
    03-02-2010, 09:11 PM Go to last post
  43. Can't seem to figure this one out...

    This question must be trickier than I thought: A statistics professor and his wife are planning to take a 2-week vacation in Hawaii, but they...

    Started by furcal201‎, 03-02-2010 11:12 AM
    • Replies: 1
    • Views: 5,114
    03-02-2010, 02:35 PM Go to last post
  44. is this a truncated normal?

    Hi there, After some algebra on a problem I have I derived the following distribution concering let's say the r.v. X. ...

    Started by leo nidas‎, 03-01-2010 03:12 PM
    • Replies: 1
    • Views: 2,982
    03-02-2010, 07:38 AM Go to last post
  45. PhD student after an equation

    Hi all, I am looking at a statistics problem at the moment and I can't figure out the analytical expression for a curve that I get with my...

    Started by tremebundo‎, 02-22-2010 07:56 PM
    • Replies: 10
    • Views: 3,681
    03-01-2010, 11:06 PM Go to last post
  46. Unhappy Urgent help needed :(

    Hey guys, its my first time in this forum and I am quite desperate. This task is totally confusing me: It is believed that as many as 25% of...

    Started by wannabe‎, 02-28-2010 03:49 PM
    • Replies: 1
    • Views: 4,320
    02-28-2010, 06:12 PM Go to last post
  47. Probability difficulties and Z scores

    I am currently grappling with this question: In a certain study the average age was 34.79 years. The SD of age was 14.78. What probability do...

    Started by Deganveran‎, 02-27-2010 05:36 PM
    • Replies: 4
    • Views: 3,799
    02-28-2010, 04:52 PM Go to last post
  48. Convolutions

    Can anyone explain convolutions to me? I've been staring at page 302 of this book (sum of 2 uniform random variables):...

    Started by sweetpotatofry‎, 02-25-2010 10:04 PM
    • Replies: 1
    • Views: 3,136
    02-27-2010, 11:14 AM Go to last post
  49. Probability Problem related to Actuarial Sceince P1

    An insurer o ers a health plan to the employees of a large company. As part of this plan, the individual employees may choose exactly two of the...

    Started by akki‎, 02-26-2010 09:18 AM
    • Replies: 0
    • Views: 4,736
    02-26-2010, 09:18 AM Go to last post
  50. count of integers in sliding window

    Hi all, I'm looking to generate a series of integers in the range , that start off with a large spacing, like 2 50 101, etc. At a peak of some...

    Started by discoross‎, 12-18-2009 03:45 AM
    • Replies: 11
    • Views: 5,631
    02-26-2010, 06:29 AM Go to last post
  51. probability question with percentage of sales

    (I accidentally posted this in the statistics forum so I am moving it over here.) I have worked on solving the problem below for over an hour and...

    Started by ealeql‎, 02-25-2010 02:56 PM
    • Replies: 3
    • Views: 10,141
    02-25-2010, 08:50 PM Go to last post
  52. Interpretation of ratios Cp

    Hi to everyone!! I have solved one exercise in statistics and I have a problem in the interpretation of these ratios: I calculated the following for...

    Started by gedoris‎, 02-24-2010 05:51 PM
    • Replies: 3
    • Views: 5,445
    02-25-2010, 08:27 PM Go to last post
  53. Normal distribution? Probability? What?! Help, please! D:

    I'm doing a sample test for a Stats quiz I have on Tuesday and I've run into a question that I just cannot get. :confused: I'm sure the method to use...

    Started by BrandiMR‎, 02-25-2010 01:38 PM
    • Replies: 2
    • Views: 3,769
    02-25-2010, 04:36 PM Go to last post
  54. Probability Concepts Homework Help!!

    Hi, I have been struggling with this question for the past few days now and still can't seem to figure it out. If anyone can help me and show me...

    Started by will023‎, 02-23-2010 03:09 PM
    • Replies: 7
    • Views: 12,441
    02-24-2010, 12:51 PM Go to last post
  55. Random Variables and CDF

    The problem: A transmission channel is noisy and a binary bit (assume it is a 0 or a 1) has probability of .11 of being incorrectly transmitted. ...

    Started by swuster‎, 02-24-2010 12:49 AM
    • Replies: 4
    • Views: 4,318
    02-24-2010, 11:16 AM Go to last post
  56. Help!!!!

    the demand for a magazine is thought to be modelled by a Gamma distribution with mean 10,000 and variance 1,000,000. A publisher prints and...

    Started by MillyMay‎, 02-24-2010 07:15 AM
    • Replies: 2
    • Views: 2,410
    02-24-2010, 08:03 AM Go to last post
  57. stochastic dominance, stochastic monotonicity

    Can someone point me out on the right direction? I need some theorems, or references or something... There's a random amount, for example, demand...

    Started by lucecita‎, 02-23-2010 06:56 PM
    • Replies: 0
    • Views: 2,953
    02-23-2010, 06:56 PM Go to last post
  58. Probability question

    Hello I am hoping that someone with a good understanding of probability theory could answer a question I have. I am trying to understand how...

    Started by maxascent‎, 02-23-2010 08:43 AM
    • Replies: 0
    • Views: 2,237
    02-23-2010, 08:43 AM Go to last post
  59. finding p-value from chi square freedom

    For example, estimated p-value from chi-square table with 1 d.f is 0.1 < p < 0.9. Can anyone tell me how we get this range? aka. can anyone help me...

    Started by hanelliot‎, 02-22-2010 11:23 PM
    • Replies: 1
    • Views: 9,003
    02-23-2010, 02:42 AM Go to last post
  60. Cup and ball game: what are the odds of that?

    OK we are having an intelectual discussion (no, really) about the change in odds during the classic cup and ball game. To explain: a dealer has...

    Started by bonedoctor‎, 02-22-2010 06:27 PM
    • Replies: 2
    • Views: 12,536
    02-22-2010, 08:00 PM Go to last post

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