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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: 30,320
    09-30-2005, 09:44 AM Go to last post
  1. sum of normal distribution help

    X~N(3,5) Y~N(-7,2) What is the distribution of Z=4X-Y/3 ? is it just =- Y/3 + 4X =- Y~N(-7/3,2/3) + X~N(-7/3 + 3,2/3 + 5) = X~N(-7/3 + 3,2/3...

    Started by omega‎, 11-21-2010 12:35 PM
    • Replies: 2
    • Views: 4,290
    11-21-2010, 02:01 PM Go to last post
  2. Angry central limit theorm help

    Z1,Z2,.... are identically independently distributed with uniform distribution . How do i use the central limit theorem to estimate the the...

    Started by omega‎, 11-20-2010 08:27 PM
    • Replies: 1
    • Views: 2,027
    11-21-2010, 01:51 PM Go to last post
  3. help with convergence of random variables

    Suppose P(Yn<=y)=1-e^(-2ny/(n+1)) for all y>0. Prove that Yn converges in distribution to Y where Y has the exponential distribution for some lambda...

    Started by omega‎, 11-21-2010 12:07 PM
    • Replies: 1
    • Views: 2,493
    11-21-2010, 01:35 PM Go to last post
  4. Help with some homework

    I got the following question for homework, We know that 27% of the homes in Cleanville have a central vacuum system. We are going to randomly...

    Started by 101stats101‎, 11-20-2010 12:52 PM
    • Replies: 1
    • Views: 1,602
    11-20-2010, 06:53 PM Go to last post
  5. random variable convergence

    Wn has density / for 0<x<1, and 0 otherwise. The random variable W has a uniform distribution on . Prove that {Wn} converges in distribution to W. ...

    Started by omega‎, 11-20-2010 01:15 AM
    • Replies: 4
    • Views: 3,174
    11-20-2010, 03:00 PM Go to last post
  6. help with random variable convergence

    P(Yn=k)= ( (1-2^(-n-1))^(-1) )/ 2^(k+1) for k=0,1,2,...,n. The random variable Y has the geometric distribution where lambda is 1/2. How can I prove...

    Started by omega‎, 11-19-2010 10:39 PM
    • Replies: 2
    • Views: 2,210
    11-19-2010, 11:31 PM Go to last post
  7. Conditional Distribution Expectation of E[Y^2]

    I understand that with the Conditional Distribution Expectation of E, it's E(E). How about E? Is the correct formula E(E)?

    Started by StatStudent3‎, 11-18-2010 11:34 PM
    • Replies: 1
    • Views: 4,155
    11-18-2010, 11:38 PM Go to last post
  8. How can we prove a text is written by a human beign?

    A computer prints two papers, on the first paper is written, "ASDDSF DFGDF ERSDKUF DFD RRVFDSDA" on the second paper is written, "HOW ARE YOU...

    Started by dorood‎, 11-17-2010 11:24 PM
    • Replies: 5
    • Views: 4,659
    11-18-2010, 06:15 PM Go to last post
  9. joint density problem

    I am having difficulty understanding a homework problem. I've attached what was given as the joint density of x & y (1 in the shaded area, 0...

    Started by shespuzzling‎, 11-17-2010 04:25 PM
    • Replies: 2
    • Views: 3,279
    11-18-2010, 09:28 AM Go to last post
  10. Normal Distribution question

    Can someone help me out with this, Based on a population that is normally distributed, with a population mean of $470 and a population standard...

    Started by 101stats101‎, 11-17-2010 06:41 PM
    • Replies: 2
    • Views: 3,306
    11-17-2010, 08:05 PM Go to last post
  11. Help with problem

    I am studying a non-symmetric binary memoryless transmission channel. Where the probability to receive a logical 0 when we send a 1 I have named it...

    Started by stu114‎, 11-17-2010 03:35 AM
    • Replies: 1
    • Views: 2,438
    11-17-2010, 11:38 AM Go to last post
  12. Bernoulli / Geometric Distribution Question

    This is a question that is on a study-guide for a test I have coming up, and I'm completely lost. I was sick when we covered Bernoulli's experiments...

    Started by porcelain.parachutes‎, 11-17-2010 12:15 AM
    • Replies: 1
    • Views: 4,587
    11-17-2010, 01:15 AM Go to last post
  13. Confusd on procedure

    I have a problem with only the this as a given Find P(Z> -.95). How do I find p...I don't know any other values to plug in or do I just make...

    Started by Kenny101516‎, 11-16-2010 07:47 PM
    • Replies: 1
    • Views: 3,922
    11-16-2010, 08:37 PM Go to last post
  14. Easy Question For Smarter People Than Me

    Hi I am new here and not that good at maths,statistics or probability but would like some help to prove a friend wrong and win a bet. Last week I was...

    Started by Peeledseal‎, 11-16-2010 07:00 PM
    • Replies: 2
    • Views: 2,091
    11-16-2010, 08:33 PM Go to last post
  15. Question about a wording/context of a problem

    I won't give the problem in its entirety here, because my only question is the wording/context of it. But I will only give a summary. Both X and Y...

    Started by StatStudent3‎, 11-16-2010 02:23 PM
    • Replies: 4
    • Views: 2,644
    11-16-2010, 04:40 PM Go to last post
  16. Need Help

    Hi I have a problem where in i need to generate a sequence for a variable which has a probability of 1/3. But length of the sequence is unknown....

    Started by Lostkid‎, 11-16-2010 03:41 AM
    • Replies: 1
    • Views: 2,326
    11-16-2010, 02:25 PM Go to last post
  17. Just starting with probability

    Hi I am just starting with probability. I have a basic question. There are three rows R1, R2, R3, and a target can appear in any of the...

    Started by Lostkid‎, 11-16-2010 04:35 AM
    • Replies: 4
    • Views: 2,544
    11-16-2010, 01:00 PM Go to last post
  18. Question my answer and Q

    Hi, can someone please have a look at my answer and Q? Thanks In advance:). Q:Let Pi represents the probability that the ith decision appears...

    Started by ms&ms‎, 10-26-2010 10:21 PM
    • Replies: 4
    • Views: 3,105
    11-16-2010, 11:13 AM Go to last post
  19. Probability System, discrete dist.

    here is the system we're dealing with here Component 1 is the key one while an identical backup component is 2 and is in an "off" state until...

    Started by gator78‎, 11-08-2010 10:47 PM
    2 Pages
    1 2
    • Replies: 28
    • Views: 9,740
    11-16-2010, 12:10 AM Go to last post
  20. Gene probability question!!

    have no idea where to go with this question so your help would be grately received. My probability is fairly basic... Three naturally occuring...

    Started by Dojo‎, 11-15-2010 07:22 PM
    • Replies: 0
    • Views: 3,230
    11-15-2010, 07:22 PM Go to last post
  21. small question in LTI system and autocorrelation

    given an LTI system: y'(t)+2y(t)=x(t) the system processes an WSS random signal X(t); E{X(t)}=0 ; Rxx(T)=delta(T). Find average power of the...

    Started by sajee3a‎, 11-15-2010 06:23 PM
    • Replies: 0
    • Views: 2,749
    11-15-2010, 06:23 PM Go to last post
  22. question in autocorrelation of WSS process

    X(t) is WSS process with E{X^2(t)}=1 what is the autocorrelation function of this process? >>R(t,t+T)=E{X(t)X(t+T)}.......?

    Started by sajee3a‎, 11-15-2010 03:02 AM
    • Replies: 2
    • Views: 3,238
    11-15-2010, 05:20 PM Go to last post
  23. Decision theory

    I came across this question and I could attempt part one , but part two is very confusing though I am not sure if the part 1 that I attempted is even...

    Started by SadieKhan‎, 11-15-2010 02:21 AM
    • Replies: 1
    • Views: 2,688
    11-15-2010, 04:02 PM Go to last post
  24. I need guidance on my probability question

    hello, Im trying to learn and not copy some one else's hard work. My question, If I have a sentence consisting of x letters (which I do not...

    Started by scripty‎, 11-15-2010 12:14 PM
    • Replies: 1
    • Views: 2,885
    11-15-2010, 12:23 PM Go to last post
  25. Help!!

    Q1. X and Y are two random variables that are independent and each one is uniform in the interval . The joint density is just 1 in the square 0 ≤ x ≤...

    Started by rk2599‎, 11-14-2010 04:43 PM
    • Replies: 0
    • Views: 1,550
    11-14-2010, 04:43 PM Go to last post
  26. need help with 2 small probability generating function questions please

    1. Let X be the number showing on a fair rolled 6 sided die. What bound does chebychevs inequality give for P(X>=5 or X<=2)? I get its <= 31/80...

    Started by omega‎, 11-14-2010 02:08 PM
    • Replies: 0
    • Views: 1,927
    11-14-2010, 02:08 PM Go to last post
  27. CJD problem

    In a large corporation, people over age 30 have an annual income whose distribution can be approximated normally ~ ($60K, $100,000,000) with SD =...

    Started by StatStudent3‎, 11-13-2010 02:47 PM
    • Replies: 7
    • Views: 3,218
    11-14-2010, 08:19 AM Go to last post
  28. probability generating function

    Let Y=x+4. Compute rY(t) in terms of rX is the answer just r 3X+4 (t) ? also

    Started by omega‎, 11-13-2010 10:04 PM
    • Replies: 3
    • Views: 3,844
    11-14-2010, 08:04 AM Go to last post
  29. very confused

    if P( Z > x ) = 0.99 2.33 = x is it correct ? very confused= =!:o

    Started by ho168‎, 11-12-2010 11:08 AM
    • Replies: 4
    • Views: 3,352
    11-14-2010, 12:58 AM Go to last post
  30. Indy Random Variables, using a Quotient

    Edit: ***SOLVED*** You have X and Y random variables, and let Z = Y/X at the end, when you want to compute the quotient probability, if they're...

    Started by StatStudent3‎, 11-12-2010 04:43 PM
    • Replies: 0
    • Views: 2,823
    11-12-2010, 04:43 PM Go to last post
  31. Joint Independent Normal Random Variable question

    This is not a HW problem, however, there are other parts to this problem(I'm giving part (a), but only parts (b) and (c) are assigned), and I'm...

    Started by StatStudent3‎, 11-11-2010 06:13 PM
    • Replies: 3
    • Views: 4,858
    11-11-2010, 09:57 PM Go to last post
  32. event within an interval

    hi all, this is my problem: - i have 2 experimental condition - the same support for both experimental condition - the support i divided i many...

    Started by laupl‎, 11-11-2010 11:47 AM
    • Replies: 0
    • Views: 3,513
    11-11-2010, 11:47 AM Go to last post
  33. kth sample moment

    Show that the kth sample moment about the origin, based on a sample of size n, is an unbiased estimate of the kth theoretical moment of a random...

    Started by welch4369‎, 11-10-2010 04:16 PM
    • Replies: 1
    • Views: 6,093
    11-11-2010, 03:55 AM Go to last post
  34. Urgent - how do i find joint density?

    If i have 2 individual probability distributions given for 2 different variables. So i have 2 variables x1 and x2. the distribution of x1 is the...

    Started by c2q‎, 11-11-2010 12:56 AM
    • Replies: 1
    • Views: 3,722
    11-11-2010, 03:35 AM Go to last post
  35. Joint Density Problem - one with a Circle

    nomessage..

    Started by StatStudent3‎, 11-10-2010 07:53 PM
    • Replies: 3
    • Views: 3,803
    11-10-2010, 10:20 PM Go to last post
  36. Higher Order Statistics

    Hi all. I am a little bit confused with the theory of the polyspectra. As stated (Mendel, Nikias, etc), the higher order spectrum of a gaussian...

    Started by strantis‎, 11-10-2010 04:48 PM
    • Replies: 0
    • Views: 2,689
    11-10-2010, 04:48 PM Go to last post
  37. [URGENT] TrickY problem about conditional probability

    1) Consumer in a supermarket, 20% buy 10 items or less, 70% spend more than $ 10, and 68% spend less than 10 dollars and buy more than 10 items. what...

    Started by JorgeMC‎, 11-01-2010 08:12 PM
    • Replies: 2
    • Views: 3,650
    11-09-2010, 04:34 PM Go to last post
  38. simple proof of expected value...

    CV are random variables. Whats a hint to show if C<=V, then E(C)<=E(V)? my bad attempt if C<=V then P(C=s)<=p(V=s) for all s so summation of...

    Started by omega‎, 11-08-2010 06:17 PM
    • Replies: 6
    • Views: 5,214
    11-09-2010, 03:47 PM Go to last post
  39. Point (X,Y) is picked inside square

    I saw this problem and we have gone over joint probability but I searched all over my textbook and could not find a problem similar. A point (X,Y)...

    Started by gator78‎, 11-03-2010 11:37 AM
    • Replies: 9
    • Views: 6,534
    11-09-2010, 12:26 PM Go to last post
  40. Help PLz.

    I'm doing my college statistics homework and i have a number of problems that i cant seem to figure out at all.. i was hoping to get someones help by...

    Started by xReTry‎, 11-08-2010 06:35 PM
    • Replies: 6
    • Views: 2,842
    11-09-2010, 12:24 PM Go to last post
  41. pls help me ok^^?

    hi all, who can give me hint to finish the question below? many thanks^^:yup: ----------------------------------------------------------------- A...

    Started by ho168‎, 11-08-2010 12:46 PM
    • Replies: 6
    • Views: 3,016
    11-09-2010, 10:50 AM Go to last post
  42. Question Small question in stochastic processes

    fair coin toss: X(t,H)=cos(t) if heads shows X(t,T)=sin(t) if tails shows Introduce a Bernoulli random variable B and express X(t) in terms of...

    Started by sajee3a‎, 11-09-2010 01:59 AM
    • Replies: 1
    • Views: 4,625
    11-09-2010, 03:26 AM Go to last post
  43. Finding Mean and Variance for X^2 Given Mean and Variance for X

    I am working on a question that has me stumped. X1, X2, ... Xn are normally distributed and independent. Each has a mean of 0 and variance sigma^2....

    Started by math_guy314‎, 11-05-2010 05:56 PM
    • Replies: 4
    • Views: 72,341
    11-08-2010, 06:47 PM Go to last post
  44. Poisson Distribution Conditional Probability

    Hello, My name is Chris and I would greatly appreciate some help concerning the folowing Probability problem. Suppose that the number of...

    Started by Swift Freeze‎, 11-08-2010 05:22 AM
    • Replies: 4
    • Views: 15,248
    11-08-2010, 10:53 AM Go to last post
  45. joint probability density function, using the Jacobian

    X1 and X2 are independent random variables from a standard normal distribution so the joint p.d.f of X1, X2 = p.d.f X1 x p.d.f X2 = ( 1/(2pi)^1/2)...

    Started by nicklt‎, 11-05-2010 02:31 PM
    • Replies: 4
    • Views: 7,412
    11-07-2010, 10:39 PM Go to last post
  46. What does this mean?

    If a question asks us to find (X,Y) or show that (X,Y) ~ something X = something Y = something does that mean it is asking us to find/show the...

    Started by c2q‎, 11-07-2010 07:19 PM
    • Replies: 1
    • Views: 2,269
    11-07-2010, 10:35 PM Go to last post
  47. expected value question

    Whats a hint to solve E(min(X,100)), when X~Geometric(theta)?

    Started by omega‎, 11-07-2010 03:01 PM
    • Replies: 3
    • Views: 4,036
    11-07-2010, 10:31 PM Go to last post
  48. variance help

    How is it possible that a variance can equal to infinity?

    Started by omega‎, 11-07-2010 08:49 PM
    • Replies: 1
    • Views: 2,412
    11-07-2010, 09:51 PM Go to last post
  49. Exclamation help with expected value

    1. Let X,Y and Z be 3 random variables, and X and Z are independent. Prove that Cov(X+Y,Z)=Cov(Y,Z). For this i expanded into E(Z(X+Y)) -...

    Started by omega‎, 11-06-2010 08:43 PM
    • Replies: 6
    • Views: 4,729
    11-07-2010, 01:09 PM Go to last post
  50. Joint Density Function - Exponentials

    please delete, I overthunk myself on this one.

    Started by StatStudent3‎, 11-06-2010 05:43 PM
    • Replies: 4
    • Views: 3,112
    11-06-2010, 10:52 PM Go to last post
  51. How to prove that an unbiased estimator does NOT exist for a parameter?

    Hello all, How can I prove that an unbiased estimator does not exist for a particular parameter? What are the methods usually used to do this? ...

    Started by Guillaume‎, 11-06-2010 07:00 PM
    • Replies: 0
    • Views: 4,269
    11-06-2010, 07:00 PM Go to last post
  52. Minimum of 2 Random Variables question

    R(1) and R(2) are 2 independent random variables with same density function f(x) = x*(e^(-.5 * x^2)) for x >= 0. Find the density of Y = min{R(1),...

    Started by StatStudent3‎, 11-04-2010 05:27 PM
    • Replies: 7
    • Views: 13,844
    11-05-2010, 11:13 PM Go to last post
  53. Exclamation Z-scores & Central Limit Theory

    I have been trying to work on my stats for a right long time now. I can't figue out this one question in my textbook. I don't understand or even know...

    Started by nursing101‎, 11-05-2010 07:03 PM
    • Replies: 1
    • Views: 6,765
    11-05-2010, 08:04 PM Go to last post
  54. Question Normal distribution probability

    Hi, :wave: I have problem to solve this question. A certain brand of cattle feed comes in bags marked 40 kg. The grain company claims that the...

    Started by minagile‎, 11-05-2010 10:58 AM
    • Replies: 2
    • Views: 3,114
    11-05-2010, 01:00 PM Go to last post
  55. Calculate the probability of collisions in an RF system?

    Dear Sirs, I have a question in probability which i hope you can help me with: In a building there are N number of transmitters. Each such...

    Started by dvash‎, 11-04-2010 11:03 PM
    • Replies: 2
    • Views: 3,951
    11-05-2010, 08:34 AM Go to last post
  56. Order Statistics Min/Max problem

    4 people agree to meet at a cafe shop at noon. The mean is noon, with SD of 5 minutes. What is the chance that some of the 4 don't arrive by 12:15? ...

    Started by StatStudent3‎, 11-04-2010 06:48 PM
    • Replies: 1
    • Views: 4,932
    11-04-2010, 08:45 PM Go to last post
  57. Easy Probability Question

    Hi. I have an easy probability question. If you flip a coin 50 times, what is the probability of getting 70% heads? Sorry this is so easy,...

    Started by cmarkos111‎, 11-04-2010 01:54 PM
    • Replies: 7
    • Views: 2,894
    11-04-2010, 05:05 PM Go to last post
  58. Markov chain

    There are two states, A and B; A is initial state from where Markov chain starts. If 5 out of 8 samples have probabilities P1, we move from A to B....

    Started by adnaniut‎, 11-04-2010 02:47 PM
    • Replies: 4
    • Views: 3,240
    11-04-2010, 04:36 PM Go to last post
  59. Special Continuous Distributions

    I am NOT asking for answers!! Let me make that clear... I'm only asking for help in the method as to solving problems such as these. I missed my...

    Started by dgbula‎, 11-03-2010 03:31 PM
    • Replies: 3
    • Views: 5,462
    11-03-2010, 06:55 PM Go to last post
  60. Transition Probability

    Hi. I have a question about transition probability. Q) Markov chain on states {0,1,2,3,4,5} has transition probability matrix (which is 6 by 6...

    Started by jjangub‎, 10-31-2010 01:23 PM
    • Replies: 7
    • Views: 4,431
    11-03-2010, 05:46 PM Go to last post

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