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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: 30,353
    09-30-2005, 09:44 AM Go to last post
  1. Help Whith this problem.. probability

    Hey my name is george... im Colombian... anyway if you guys can help me with this one i will try to translate this the better i can A box of 50...

    Started by GeorgeVergel‎, 03-11-2011 01:34 PM
    • Replies: 6
    • Views: 2,572
    03-11-2011, 04:54 PM Go to last post
  2. plotting a CDF from PDF

    I am trying to plot the CDF from the pdf given: f(x) = 1 + x , -1 <x ≤ 0 f(x) = 1 - x , 0 < x < 1 f(x) = 0 , otherwise So I...

    Started by maybe‎, 03-09-2011 07:19 PM
    • Replies: 11
    • Views: 11,016
    03-10-2011, 04:21 PM Go to last post
  3. Given Joint Density Function

    f(x) { x(1+3y^2)/4 0<x<2, 0<y<1 0 otherwise 1. Find g(x), h(y) 2. Find f(x|y) 3.Evaluate P(1/4<x<1/2 | Y=1/3) in getting g(x) is this...

    Started by ARCHCOS‎, 03-09-2011 04:29 PM
    • Replies: 5
    • Views: 4,681
    03-10-2011, 04:10 PM Go to last post
  4. Looking for help with a question :)

    Hi folks, I'm trying to help a friend with some statistics but since I study engineering it's not something I have covered. If anyone could assist me...

    Started by Mearsy‎, 03-09-2011 05:34 AM
    • Replies: 1
    • Views: 2,677
    03-10-2011, 10:07 AM Go to last post
  5. Question probability problem

    For detecting a disease, a test gives correct diagnosis with probability 0.99. It is known that 1% of the population suffers from this disease. If a...

    Started by Sambit‎, 02-21-2011 11:36 AM
    • Replies: 5
    • Views: 5,890
    03-10-2011, 08:19 AM Go to last post
  6. MLE Question - Bernoulli Distribution

    Q. A and B are playing a tennis match. A is serving for the entire game. Let p_A be the probability that A wins when A serves. In this game, A wins...

    Started by languagelearner23‎, 03-10-2011 06:35 AM
    • Replies: 1
    • Views: 3,260
    03-10-2011, 06:40 AM Go to last post
  7. Joint Probability Distribution

    Joint Probability Distribution for Random Variable X and Y? Three cards are drawn without replacement from 12 face cards (Jacks, Queens, and Kings)...

    Started by ARCHCOS‎, 03-09-2011 02:26 PM
    • Replies: 3
    • Views: 5,849
    03-10-2011, 04:56 AM Go to last post
  8. Joint density function question

    let X and Y be a continuous random variables having joint density function of f(x,y)=c(x^2 + y^2), 0<=x<=1, 0<=y<=1 1) Determine the constant c.

    Started by ARCHCOS‎, 03-09-2011 02:34 PM
    • Replies: 10
    • Views: 4,010
    03-09-2011, 04:52 PM Go to last post
  9. Probability/Stats help

    I wasn't sure what forum to post this is in, its for stats class but it ask for probabilities. A survey measured numbers of hours per month spend...

    Started by denimchicken‎, 03-09-2011 12:13 AM
    • Replies: 1
    • Views: 2,223
    03-09-2011, 01:32 AM Go to last post
  10. E(X) and variance of i.i.d without integration

    How would you calculate the Expected value of a independent identically distributed seq. of continuous RVs without using integration? i don't know...

    Started by maybe‎, 03-08-2011 07:06 PM
    • Replies: 3
    • Views: 4,207
    03-08-2011, 11:50 PM Go to last post
  11. What type of sampling is this....`

    First of all sorry if this is in the wrong section but i think is the section that applies most! I want to distrubute questionaires to five groups...

    Started by 98107‎, 03-04-2011 03:35 PM
    • Replies: 5
    • Views: 2,946
    03-08-2011, 11:23 PM Go to last post
  12. Lightbulb Probability of event

    Hello Friends I'll try to ask in very simple way I will have multiple choice test next month and i have 240 questions every question has 3...

    Started by banebt‎, 03-07-2011 09:03 AM
    multiple choice questions, probability
    • Replies: 7
    • Views: 3,564
    03-08-2011, 02:06 PM Go to last post
  13. Joint Probability

    X and Y below are independent: How am I going to solve the joint probability? Am I correct if I solve it this way:

    Started by dEconomist‎, 03-08-2011 10:46 AM
    • Replies: 1
    • Views: 2,973
    03-08-2011, 11:10 AM Go to last post
  14. Likelihood Ratio Test Statistic

    Hi guys, Heres my problem: ********** Data X1,X2,....,Xn, n = 20, are available of numbers of flaws per 10 metres of bales of a manufactured...

    Started by starlet‎, 03-07-2011 07:57 AM
    likelihood ratio test, poisson distribution, simple hypotheses
    • Replies: 5
    • Views: 10,581
    03-08-2011, 01:43 AM Go to last post
  15. on the probability density function

    Good morning to all. I have a question: I have a data set X={x_1, x_2, ... , x_N} with probability density function P(x) (suppose continuous); if I...

    Started by StatLinux‎, 03-07-2011 06:02 AM
    dataset operation, density function
    • Replies: 5
    • Views: 4,039
    03-07-2011, 04:35 PM Go to last post
  16. looking for some help with my highschool homework

    hey everyone, sorry for the english i'm not a native. i'm was hoping to you could help me a little bit with a few homework assignments i have ...

    Started by dodovra‎, 03-07-2011 12:05 PM
    • Replies: 5
    • Views: 3,320
    03-07-2011, 03:05 PM Go to last post
  17. MLE question

    Q. The proportion of metal in an ore sample has the pdf: f(u) = c.u^(c-1) 0≤u≤1 (a) The parameter c>0 is a measure of the quality...

    Started by languagelearner23‎, 03-06-2011 01:37 PM
    • Replies: 6
    • Views: 2,381
    03-07-2011, 09:08 AM Go to last post
  18. MLE Question using binomial distribution

    Q. There are N fish in a lake. Six fishermen fished for 3 hours and caught 8 fish between them. They fished for another 3 hours and caught 3 more...

    Started by languagelearner23‎, 03-06-2011 07:41 PM
    • Replies: 2
    • Views: 3,600
    03-07-2011, 07:14 AM Go to last post
  19. Binomial/geometric distributions

    Which of the following are true statements? I. The histogram of a binomial distribution with p=0.5 is always symmetric II. The histogram of a...

    Started by fireman144‎, 03-06-2011 10:54 PM
    • Replies: 6
    • Views: 5,638
    03-07-2011, 03:21 AM Go to last post
  20. f-divergences

    Hi, Is there a 'natural' way to extend f-divergences to multiple distributions? For instance, JS-Divergence for three distributions? Tx, Omri.

    Started by omrit‎, 02-22-2011 08:58 AM
    • Replies: 2
    • Views: 2,955
    03-06-2011, 05:20 PM Go to last post
  21. Maximum Likelihood Estimator question with binomial distribution

    Q. Lifetimes of components are Gamma distributed. The parameters of the Gamma are shape = a scale = λ The pdf is: f(x) =...

    Started by languagelearner23‎, 03-06-2011 07:43 AM
    • Replies: 3
    • Views: 5,626
    03-06-2011, 01:21 PM Go to last post
  22. Maximum likelihood estimator question with discrete uniform distribution

    Q. A bag contains sequentially numbered lots (1,2...N). Lots are drawn at random (each lot has the same probability of being drawn). Two lots are...

    Started by languagelearner23‎, 03-06-2011 07:40 AM
    • Replies: 9
    • Views: 12,774
    03-06-2011, 01:15 PM Go to last post
  23. cumulative distribution function for error

    Hi, I need help regarding the generation of cumulative distribution function (CDF) for distance error. I have a system which calculates...

    Started by hammid1981‎, 03-03-2011 10:15 AM
    • Replies: 9
    • Views: 6,295
    03-04-2011, 12:06 AM Go to last post
  24. Lottery probability. What if a friend wins?

    As a programmer I've worked a little bit with statistics, but not much with probability. An interesting question has come to mind this week, and it...

    Started by donkeyhotay‎, 03-01-2011 09:35 AM
    • Replies: 8
    • Views: 5,708
    03-03-2011, 04:53 PM Go to last post
  25. probability of rocket launch failure

    hi everyone. My statistics/probability knowledge is unfortunately striving towards zero, therefore I would greatly appreciate any kind of input on...

    Started by julia_w‎, 03-03-2011 07:38 AM
    consecutive, probability
    • Replies: 4
    • Views: 6,917
    03-03-2011, 10:24 AM Go to last post
  26. calculation of distance using Kullback–Leibler divergence

    Hi, Basically I'm from biology back ground. So it may be a basic question for you. I have two plots for example plot1: X - axis values: ...

    Started by asd123‎, 03-03-2011 05:39 AM
    • Replies: 2
    • Views: 121,610
    03-03-2011, 09:39 AM Go to last post
  27. Question Novice Question (not a stats student)

    I have a set of 6000 I can pull 300 random unique records at a time How many times will I need to pull to have a 95% chance of having all...

    Started by EricIsGood‎, 02-28-2011 05:21 PM
    • Replies: 2
    • Views: 2,737
    03-01-2011, 02:34 AM Go to last post
  28. kindly explain this solution of reyleigh distribution

    I m attaching the question and solution. kindly explain this to me or if u can give some other solution, it will be great help

    Started by moonnightingale‎, 02-25-2011 07:58 AM
    • Replies: 3
    • Views: 3,822
    02-27-2011, 11:02 AM Go to last post
  29. Binomial, did I solve correctly ?

    Hi guys, can you please tell me if I am anyway right with this ? The price of a cake of kind A is 15$. The price of a cake of kind B is 10$. The...

    Started by WeeG‎, 02-26-2011 12:17 PM
    • Replies: 3
    • Views: 2,384
    02-26-2011, 11:18 PM Go to last post
  30. Arithmetic proof of predicted values

    Maybe the title of this thread should be: Arithmetic proof of predicted values or Why you shouldn't let stats lie dormant in your life for 7...

    Started by davidbgonzalez‎, 02-25-2011 12:26 PM
    discrete response models, probability question, proof
    • Replies: 2
    • Views: 2,412
    02-25-2011, 01:08 PM Go to last post
  31. Help with Binomial & Poisson Distribution!!

    Hello forum! I am trying to do complete my homework however I am unsure if I did what was asked correctly for one question and I am having issues...

    Started by FcNo‎, 02-24-2011 01:39 PM
    • Replies: 4
    • Views: 5,056
    02-25-2011, 12:13 PM Go to last post
  32. Probability of an event occuring

    Hi there, I was hoping someone could give me some help on the best way to investigate a problem. I really don´t know much about probability but here...

    Started by mateo2011‎, 02-24-2011 05:43 PM
    • Replies: 0
    • Views: 3,182
    02-24-2011, 05:43 PM Go to last post
  33. Is this possible?

    Hello, I've been pondering this question for a while but I don't think I have what it takes to come up with the answer. I'd really appreciate some...

    Started by TheNewbie‎, 02-24-2011 04:22 PM
    • Replies: 4
    • Views: 2,667
    02-24-2011, 05:12 PM Go to last post
  34. Poisson Distribution

    Here's the question: The number of calls that come into a small mail-order company follows a Poisson distribution. Currently, these calls are...

    Started by melaniemarieg‎, 02-21-2011 08:18 PM
    • Replies: 1
    • Views: 5,432
    02-24-2011, 04:17 AM Go to last post
  35. Discrete Probability

    Hello all. I recently became a member on this forum. Hope to learn many new things from here and in my statistics course in college. I am still...

    Started by discgolfer87‎, 02-23-2011 07:43 PM
    • Replies: 1
    • Views: 12,426
    02-24-2011, 12:06 AM Go to last post
  36. 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: 8,603
    02-23-2011, 09:10 AM Go to last post
  37. The Old Coin Toss Question

    Helppppp meeee! AH. :wave: John flips a fair, two-sided coin 5 times. a. What is the probability that he flips 4 heads? ...

    Started by aab11786‎, 02-06-2011 07:25 PM
    • Replies: 2
    • Views: 3,439
    02-23-2011, 06:18 AM Go to last post
    • Replies: 0
    • Views: 3,047
    02-22-2011, 02:33 PM Go to last post
  38. Sample size influence on the mean for non-normal distributions?

    Hi, I'm not a statistician so sorry if this is dumb. I am making non-linear (neural networks) models and my errors are not supposed to be normal,...

    Started by darfunkel‎, 02-20-2011 03:49 PM
    • Replies: 1
    • Views: 4,039
    02-22-2011, 03:56 AM Go to last post
  39. Sample mean Question

    Research indicates that, in general, women in United States earn $0.77 for each $1.00 earned by a man in an equivalent job. A sample of 100 women...

    Started by chahn20‎, 02-21-2011 03:00 AM
    • Replies: 0
    • Views: 2,340
    02-21-2011, 03:00 AM Go to last post
  40. Question Marble Question

    Hey guys, This is my first posting on here. I am a beginner in Prob/Stat and will be starting a class this summer. I want to learn as much as I...

    Started by eternalsummer247‎, 02-20-2011 11:36 PM
    • Replies: 1
    • Views: 3,124
    02-21-2011, 12:20 AM Go to last post
  41. Question How would I calculate triple coin flipping in sets?

    Say you have three pennies. You throw them all in the air and record the way they land. Then you do this five more times for a total of six throws: ...

    Started by pennyman‎, 02-19-2011 06:15 PM
    • Replies: 4
    • Views: 4,846
    02-19-2011, 08:33 PM Go to last post
  42. The Generator and Compensator of Stochastic Processes

    What is, intuitively, the difference between the generator and compensator of a stochastic process? tks

    Started by psalgado‎, 02-19-2011 11:20 AM
    • Replies: 0
    • Views: 3,210
    02-19-2011, 11:20 AM Go to last post
  43. Many urns, two color marbles = distribution?

    Not homework here, actually trying to estimate the success rate of an algorithm against a random strategy... 25 white marbles 25 red marbles...

    Started by westand‎, 02-18-2011 12:42 PM
    • Replies: 0
    • Views: 2,039
    02-18-2011, 12:42 PM Go to last post
  44. Poisson RV

    Hi Guys, I just need you to check if I solved correctly... The number of power problems a day in some city, is a poisson random variable. it is...

    Started by WeeG‎, 02-18-2011 07:58 AM
    • Replies: 0
    • Views: 2,003
    02-18-2011, 07:58 AM Go to last post
  45. Conditional multivariate

    Strangely, I am not sure about something very simple... I know that by definition, P(X1 | X2,X3) = P(X1,X2,X3) / P(X2,X3) But is this also...

    Started by omrit‎, 02-15-2011 05:09 AM
    • Replies: 1
    • Views: 3,234
    02-15-2011, 10:18 AM Go to last post
  46. Probability Theory

    An automobile insurance company classifies drivers into 3 classes: class A, class B, and class C. The percentage of drivers in each class is: class...

    Started by stat_student001‎, 02-14-2011 01:35 PM
    • Replies: 2
    • Views: 2,922
    02-14-2011, 07:43 PM Go to last post
  47. Hidden State Modeling

    The disease state is continuously changing in patients and I want to be able to predict this change (slope) ahead of time using 3 variables measured...

    Started by psurana‎, 02-05-2011 03:27 AM
    • Replies: 1
    • Views: 2,723
    02-14-2011, 01:02 PM Go to last post
  48. 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: 8,664
    02-14-2011, 04:09 AM Go to last post
  49. Probability of complements.. is it that simple?

    P(A) = 1/4 P(B) = 2/3 P(A|B) = 1/4 Question: What is P(A^c|B^c) ? I don't think it's just 1 - 1/4 = 3/4 ... Would it be P(A^c) * P(B^c) =...

    Started by exitus‎, 02-13-2011 08:19 PM
    • Replies: 2
    • Views: 4,081
    02-14-2011, 01:19 AM Go to last post
  50. Lightbulb Weighted Die

    Hello I have a question about weighted die and binomal distribution the question goes like this Someone rolls one die 5 times. The die is...

    Started by quackquack‎, 02-13-2011 02:00 AM
    • Replies: 3
    • Views: 5,678
    02-13-2011, 03:25 PM Go to last post
  51. Sampling Distribution Question

    I have a couple questions here that I think I am doing correctly, just want some confirmation? Thanks! 1. Suppose that the final exam scores of a...

    Started by jz722‎, 02-09-2011 11:17 PM
    • Replies: 4
    • Views: 5,387
    02-12-2011, 12:22 AM Go to last post
  52. Very very low arrival rate and fitted distribution

    I am attempting to fit a distribution to a process with a low arrival rate. The unit measurement is 1 day and I have an average arrival rate of 0.02...

    Started by rayuk‎, 02-10-2011 04:57 PM
    • Replies: 2
    • Views: 3,225
    02-11-2011, 09:50 AM Go to last post
  53. Post Unit Root

    What's this about? I'm new to econometrics and i'm trying to understand this conceptually. I know it has to do with nonstationarity (mean, variance...

    Started by Demgo‎, 02-09-2011 06:14 PM
    nonstationarity, random walk, stationarity, unit root, white noise
    • Replies: 0
    • Views: 3,526
    02-09-2011, 06:14 PM Go to last post
  54. Review this Probability math

    Hi, I'm a new user looking for assistance in a single probability equation: So to try to help convey my problem as clear as possible I'll list my...

    Started by nbccc12‎, 02-09-2011 02:08 AM
    • Replies: 1
    • Views: 4,939
    02-09-2011, 05:21 AM Go to last post
  55. Roulette & interesting binomial question

    Hi everyone, Since I have some mathematical knowledge my friend asked me to help him out with a question with which I'm struggling: "On a...

    Started by steve695‎, 02-07-2011 10:19 AM
    • Replies: 5
    • Views: 5,387
    02-08-2011, 06:07 AM Go to last post
  56. probability channels

    We have a weather station somewhere in the country, with the aid of satelitte information and it gives us the probability of rain every day. Suppose...

    Started by kajamix‎, 07-11-2010 11:38 AM
    • Replies: 3
    • Views: 2,719
    02-07-2011, 10:00 PM Go to last post
  57. 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: 6,604
    02-07-2011, 08:36 AM Go to last post
  58. Smile Please help me! binomial probability

    Hi everyone, I m new to stats and I m stuck with this two question for 2 hours now...I ll be really appreciate if someone here could show me how to...

    Started by baisha‎, 02-06-2011 06:48 AM
    • Replies: 2
    • Views: 6,947
    02-06-2011, 02:17 PM Go to last post
  59. Trinomial Joint Density

    The Question: An unbiased six-sided die is cast 30 independent times. Let X be the number of 1's and Y be the number of 2's. a) What is the...

    Started by Guthrie‎, 02-05-2011 09:44 PM
    • Replies: 1
    • Views: 3,715
    02-05-2011, 10:28 PM Go to last post

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