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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: 30,210
    09-30-2005, 09:44 AM Go to last post
  1. Question problem on gamma distribution

    let X_1,X_2,......,X_n be 'n' i.i.d random variables, each following gamma (1,3) distribution. show that P(X_1+X_2+.....X_n > 3(n-\sqrt{n}) ) >...

    Started by Sambit‎, 10-31-2010 08:45 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 7,755
    11-01-2010, 07:15 AM Go to last post
  2. Indicated probability

    Assume that X has a normal distribution, and find the indicated probability. The mean is μ = 15.2 and the standard deviation is σ = 0.9. Find the...

    Started by Katze‎, 12-12-2010 01:58 PM
    • Replies: 1
    • Views: 7,745
    12-12-2010, 03:16 PM Go to last post
  3. Please HELP ME

    Hello everyone... I really need ur help in solving these questions.. 1) Two cards are randomly drawn from a deck of 52 playing cards. Find the...

    Started by i_like_maths‎, 02-19-2009 09:33 AM
    • Replies: 3
    • Views: 7,734
    02-20-2009, 10:46 AM Go to last post
  4. Help! - Probability Problem

    I need some help with this one: A company is considering implementing one of two quality control plans for monitoring the weights of automobile...

    Started by webcrawler‎, 04-17-2006 03:55 PM
    • Replies: 1
    • Views: 7,723
    04-18-2006, 06:48 AM Go to last post
  5. Expected value and confidence interval for non-normally distributed discrete variable

    Greetings, Say I pull 11 random independent samples from a population and they take on the following values (assume that these are the only values...

    Started by John Reed‎, 07-04-2011 02:29 AM
    • Replies: 3
    • Views: 7,704
    07-04-2011, 02:35 PM Go to last post
  6. Expected value, variance, standard deviation

    I am kind of stuck :confused: Problem: A random variable X has the distribution: px = ( 0 1 2 4 ) ...

    Started by i97supratti‎, 12-04-2006 05:14 PM
    • Replies: 3
    • Views: 7,681
    12-04-2006, 11:02 PM Go to last post
  7. How do I get pmf from a table of cdf?

    If I have a cdf table looks like this. How do I calculate the respect pdf? cdf X,Y 1 2 3 1 a b c 2 d e f...

    Started by iamsevenup‎, 01-11-2009 09:10 PM
    • Replies: 1
    • Views: 7,641
    01-11-2009, 10:06 PM Go to last post
  8. Sampling Probability

    Hi, Can anyone help with this problem: If i have a given volume (v) that contains a number of discrete particles (p) randomly distributed...

    Started by PresterJohn‎, 06-22-2010 07:18 AM
    • Replies: 10
    • Views: 7,640
    06-29-2010, 07:29 AM Go to last post
  9. probability question

    Hello, I am having trouble with my stat homework. Maybe someone can give me some guidance? I would really appreciate it! A woman is fishing for...

    Started by letsstophere‎, 10-21-2008 09:51 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 7,637
    10-28-2008, 04:23 PM Go to last post
  10. total demands in the next two weeks (normal distribution)

    Hi guys. Problem: The weekly demand for a product approximately has a normal distribution with mean 1,000 and standard deviation 200. The...

    Started by jwxie518‎, 06-29-2011 05:07 PM
    • Replies: 2
    • Views: 7,635
    06-30-2011, 01:14 AM Go to last post
  11. 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: 7,606
    03-27-2010, 05:13 PM Go to last post
  12. Question Homework Question Need Help ASAP

    I have a homework problem that I am really stuck on and unfortunately it is due by wednesday so I am hoping someone can help me out. Here it goes: ...

    Started by Jessicamaher‎, 11-27-2006 10:47 PM
    • Replies: 1
    • Views: 7,605
    11-28-2006, 09:11 AM Go to last post
  13. Proving some axioms about sigma algebra.

    I have the following to prove: Given a sigma field/sigma algebra B on a set S. Prove: i) 0 E B ii) if B1,..,Bk E B then UBi E B for i = 1 to n...

    Started by c2q‎, 02-04-2012 01:13 PM
    • Replies: 9
    • Views: 7,590
    02-05-2012, 10:32 PM Go to last post
  14. Conditional probability with Binomial distribution

    Hello all I am trying to make a calculation here, and the result doesn't make sense to me, I don't know what I am doing wrong... I have a...

    Started by NN_STAT‎, 08-15-2013 02:51 AM
    • Replies: 4
    • Views: 7,588
    08-15-2013, 03:27 PM Go to last post
  15. Confidence interval for binary data

    Hi, I've got binary data (0 & 1's) which I represent as a average along a variable "speed". E.g. when speed is 5, the data is and I present that by...

    Started by jhnienhuis‎, 07-14-2009 12:03 PM
    • Replies: 0
    • Views: 7,558
    07-14-2009, 12:03 PM Go to last post
  16. Unbiased Estimator Question

    Suppose that Y has a Poisson distribution with parameter lambda. How can I show that (-2)^lambda is an unbiased estimator of e^(-3*lambda)?

    Started by mada2009‎, 01-22-2012 04:48 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,542
    01-26-2012, 11:32 AM Go to last post
  17. Consequences of choosing the wrong likelihood function...

    hey everyone! just a quicky-quick question here. i think i remember reading somewhere that some of the nice properties of parameter estimates...

    Started by spunky‎, 09-20-2012 02:49 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 7,532
    09-23-2012, 12:17 PM Go to last post
  18. Moment Generating Function of a Chi-Squared distribution

    Hey guys, need help with this question. Random Variables V and U are independent with N~(0,4). Let W = U^2 + V^2 . Calculate P(W>24). Is the...

    Started by saternal‎, 05-07-2012 09:02 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 7,529
    05-09-2012, 01:54 AM Go to last post
  19. Transition Probability Matrix

    The 6 faces of a fair die are marked with the numbers 1,2,3,4,5,6. We roll the die repeatedly and independently, noting the numbers that come up. We...

    Started by welch4369‎, 10-27-2010 02:17 PM
    • Replies: 3
    • Views: 7,528
    10-27-2010, 09:32 PM Go to last post
  20. [SOLVED] Sensitivity/Specificity

    Here is my question: The sensitivity of a screening test is 0.95 and it's specificity is 0.85. The rate of the disease for which the test is used...

    Started by kelly g‎, 01-28-2012 03:17 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 7,519
    01-29-2012, 11:08 PM Go to last post
  21. Joint density function

    This is from Exercise 5.26 from Mathematical Statistics with Applications v6. f (y1, y2) = {2, 0 <= y1 <= 1, 0 <= y2 <= 1, 0 <= y1 + y2 <= 1 ...

    Started by statsdud‎, 04-22-2008 05:43 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 7,514
    04-22-2008, 05:15 PM Go to last post
  22. Conditional Probability

    To reduce theft, the ABCD Company screens all its employees with a lie detector test that is known to be correct 90 percent of the time (for both...

    Started by quark‎, 10-30-2005 11:59 PM
    • Replies: 0
    • Views: 7,509
    10-30-2005, 11:59 PM Go to last post
  23. Bayes theory interview question.

    This question is a typical interview question at a job I am currently seeking. The reason I am posting it is I have had different answers from...

    Started by ntyris9‎, 09-12-2012 05:22 PM
    • Replies: 3
    • Views: 7,493
    09-12-2012, 08:45 PM Go to last post
  24. Gamma Distribution parameters

    Hi, I'm trying to understand the theory behind the probability distributions specifically what do the shape and scale parameters for gamma...

    Started by panbalag‎, 09-19-2010 11:06 AM
    • Replies: 4
    • Views: 7,492
    09-28-2010, 01:14 AM Go to last post
  25. Raffle with many entries per person, many prizes, limit one prize per person

    Consider a raffle for which each person may buy any number of tickets. There are many prizes but each each person may only win one prize. What is the...

    Started by clint.t.graham‎, 01-17-2012 06:03 PM
    contest, multiple, prize, raffle
    • Replies: 2
    • Views: 7,491
    01-19-2012, 01:55 PM Go to last post
  26. probability

    This is a part of a problem. I decided to ask it here after hours of trying to solve it... Two tennis players make a match composed of 5 sets....

    Started by demolay‎, 11-25-2005 12:34 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 7,476
    11-30-2005, 04:49 PM Go to last post
  27. Prove or Dispprove Independence Statement

    Hey, "If A is independent of B and B is independent of C, then A is independent of C. Prove this statement or give a counterexample if it is...

    Started by Slime‎, 01-16-2013 07:14 PM
    • Replies: 1
    • Views: 7,462
    01-16-2013, 07:35 PM Go to last post
  28. Gamma Probability (really an area of a circle question)

    The question reads: Explosive Devices used in mining operations produce nearly circular craters when detonated. The radii of these craters are...

    Started by OToole‎, 02-18-2010 07:43 AM
    • Replies: 1
    • Views: 7,460
    02-18-2010, 09:20 AM Go to last post
  29. 97th percentile

    "suppose the moisture content per pound of a dehydrated protein concentrate is normally distributed with a mean of 3.5 and standard deviation of 0.5....

    Started by kelly g‎, 03-26-2012 08:36 PM
    • Replies: 5
    • Views: 7,444
    03-26-2012, 10:34 PM Go to last post
  30. Probability of getting 3 out 5

    I am driving myself up the wall. I am trying to figure out the probability of getting 3 out of 5 questions right. At first my thougt was 1/5 x 1/5 x...

    Started by pjkaraffa‎, 09-11-2009 09:27 AM
    • Replies: 1
    • Views: 7,442
    09-11-2009, 10:48 AM Go to last post
  31. Question I had 100 question and I am stuck with the following 7 questions! Help

    Suppose the fill amount of bottles of soft drink has been found to be normally distributed with a mean of 2.0 liters and a standard deviation of...

    Started by gdefne‎, 11-07-2005 02:15 PM
    • Replies: 1
    • Views: 7,439
    11-07-2005, 02:46 PM Go to last post
  32. distribution of the range of N independent standard normal variables

    Let x1, x2, ... xn be independent standard normal variables. (standard normal: normal with 0 mean and variance 1). Let the range R be defined as...

    Started by AndyMC‎, 02-19-2010 08:49 AM
    • Replies: 4
    • Views: 7,428
    02-20-2010, 01:07 AM Go to last post
  33. Probability Problem - Please help

    Hi, I've got a probability problem that has had me stumped all weekend. Can anybody please help? Suppose that two balanced dice are tossed...

    Started by Nicholas‎, 07-02-2007 05:07 AM
    • Replies: 1
    • Views: 7,426
    07-03-2007, 12:20 PM Go to last post
  34. Joint Density Function Question

    So (fy1,fy2) = e^-(y1 + y2) ) , for y1>0, y2>0 and 0 elsewhere. What is P(Y1 + Y2 < 3) The answer is .8009 I just can't work out how to get...

    Started by OToole‎, 02-21-2010 04:48 AM
    • Replies: 4
    • Views: 7,397
    02-21-2010, 08:52 AM Go to last post
  35. Conditional probability calculation

    Please can someone help me with the following question: An urn contains 3 white, 6 red and 5 black balls. Six of these balls are randomly selected...

    Started by Angela_o‎, 07-29-2011 02:55 AM
    • Replies: 1
    • Views: 7,397
    08-08-2011, 11:16 AM Go to last post
  36. Fairly Easy Question - Poisson Distribution

    My first post! Anyway I just need a bit of help with a question that I've come across in a textbook which is as follows: Cars arrive at a toll...

    Started by OToole‎, 02-11-2010 02:50 AM
    • Replies: 5
    • Views: 7,391
    02-11-2010, 10:48 PM Go to last post
  37. Type II error

    I'm currently doing a statistics assigment. In one of the questions, i've been asked to "discuss" what the probability of a Type II error, what i...

    Started by resonance‎, 10-09-2008 07:00 PM
    • Replies: 10
    • Views: 7,387
    10-12-2008, 10:47 AM Go to last post
  38. Binary Bootstrap

    Is it valid to use a bootstrap technique for estimating variance in a binary (yes/no or 1/0) data set? My motivation for doing so is to perform...

    Started by cmonke‎, 08-15-2009 02:57 PM
    • Replies: 5
    • Views: 7,384
    09-29-2009, 04:01 AM Go to last post
  39. Please Help - Probability Question

    A statistical analysis of 1,000 long-distance telephone calls made from the headquarters of the Bricks and Clicks Computer-corporation indicates that...

    Started by shortmikeshortt‎, 04-26-2009 01:29 AM
    • Replies: 1
    • Views: 7,377
    04-26-2009, 04:21 AM Go to last post
  40. Can I calculate a p-value here?

    Hey everyone! Ok so I ran a biochemistry experiment the other day and I wanted to calculate a p-value for my data. The experiment is pretty...

    Started by chemnerd1‎, 04-02-2009 03:19 AM
    • Replies: 2
    • Views: 7,369
    04-02-2009, 04:47 PM Go to last post
  41. CDF - Cauchy distribution

    Suppose that a particle is fired from the origin in the (x, y)-plane in a straight line in a direction at a random angle theta(the symbol with the...

    Started by StatStudent3‎, 11-01-2010 04:04 PM
    • Replies: 3
    • Views: 7,363
    11-01-2010, 05:59 PM Go to last post
  42. 19 lowercase letters + 1 single digit number = possible combinations ?

    Hi everybody and happy new year too all :tup: I've just discovered this forum today and I have one thing to say : AWESOME ! :) I have trouble...

    Started by frederic1‎, 01-17-2011 01:23 PM
    • Replies: 10
    • Views: 7,362
    01-20-2011, 03:42 AM Go to last post
  43. 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: 7,359
    11-07-2010, 10:39 PM Go to last post
  44. Poisson process, payment, standard deviation

    We have an insurance company that pays out claims at times of a Poisson process, with rate 4 per week. Suppose that the mean payment is 10K dollar...

    Started by Ego7894612‎, 08-31-2010 08:59 AM
    • Replies: 6
    • Views: 7,350
    09-01-2010, 09:06 PM Go to last post
  45. Process capability without variability in data?

    My company uses Cpk to judge process capability, with a 1.33 Cpk being the acceptable minimum for most processes. In some cases, we do not have...

    Started by Dannyboy175‎, 09-09-2009 01:34 PM
    • Replies: 5
    • Views: 7,348
    09-11-2009, 06:41 AM Go to last post
  46. Normal Approx problem(u, Var)

    This is a homework problem from last week - I had it figured out last week before I turned it in(and the answer in the back of the book confirmed...

    Started by StatStudent3‎, 10-23-2010 01:02 PM
    • Replies: 3
    • Views: 7,337
    10-23-2010, 02:31 PM Go to last post
  47. why should the I use a t distribution? (theory question)

    Hello I would like some help with the theory behind the t-test. I know how to technically perform a t-test but something in the logic doesn't add...

    Started by gargy‎, 05-19-2010 05:44 AM
    • Replies: 5
    • Views: 7,325
    05-19-2010, 01:15 PM Go to last post
  48. discrete approximation of a normal distribution

    Hi, i have a normal distribution \mu=10, \sigma=1 and need a discrete approximation of it in order to calculate e.g. P(X=8). How can i...

    Started by knild‎, 04-16-2012 09:33 AM
    • Replies: 5
    • Views: 7,319
    04-16-2012, 11:05 AM Go to last post
  49. Help me please

    Hi all, please i have only one question and I can finish my qestions exam which isdue to morrow,Please , I beg you to help me. Q: The P - value in...

    Started by keith‎, 09-29-2005 01:58 PM
    • Replies: 1
    • Views: 7,316
    09-29-2005, 07:20 PM Go to last post
  50. Poisson Distribution Question

    I am using the Poisson distribution model the determine the probability of an event occurring. I know that the mean of the event occurring is 7. ...

    Started by Relentless‎, 10-31-2005 11:11 PM
    • Replies: 10
    • Views: 7,307
    11-01-2005, 12:17 PM Go to last post
  51. Probabilities and variable Z

    The question was asked... For standard normal random variable Z, find the following probability P(Z=0.74). I looked in my book's table and found...

    Started by jessica1983‎, 06-09-2012 09:07 PM
    • Replies: 4
    • Views: 7,299
    06-10-2012, 05:31 PM Go to last post
  52. Distribution and Laplace Transform

    Consider a game in which a fair coin is tossed indefinitely. Every time heads appears you move 1 metre to the right, and if tails you stay where you...

    Started by woody198403‎, 08-15-2009 09:18 PM
    • Replies: 5
    • Views: 7,289
    08-16-2009, 05:43 AM Go to last post
  53. Scaling covariance and variance

    I have the variance and covariances for a number of assets(stocks), and i need to scale them from 1 month to a year. Would it be correct to think...

    Started by thedreamshaper‎, 10-13-2010 04:59 PM
    • Replies: 1
    • Views: 7,272
    10-14-2010, 12:16 AM Go to last post
  54. Poisson distribution and p-value

    Does anyone know how to find a general p-value for the poisson distribution. All I have is the expected number of occurrences, given by the poisson...

    Started by Raynor5000‎, 03-18-2008 01:09 PM
    • Replies: 0
    • Views: 7,267
    03-18-2008, 01:09 PM Go to last post
  55. HELP! using continuity correction factor

    Hi, I have been having issues with this question: An airline company knows that 8% of its passengers will not show up for their flight. A plane...

    Started by katherine1‎, 02-15-2008 03:51 PM
    • Replies: 4
    • Views: 7,256
    03-26-2008, 08:26 AM Go to last post
  56. Question A simple problem about normal distribution

    At supermarkets in a Midwestern city the sales of canned tuna varies from week to week. Marketing researchers have determined that there is a...

    Started by jazzpasta‎, 02-07-2012 10:59 AM
    • Replies: 2
    • Views: 7,242
    02-07-2012, 06:01 PM Go to last post
  57. Exclamation Please help! ***

    I'm having a difficult time figuring this out... confused on how to go about solving, & which formula/steps to use.... A population has a mean...

    Started by ecohelp‎, 10-05-2005 11:43 PM
    • Replies: 1
    • Views: 7,209
    10-06-2005, 08:03 AM Go to last post
  58. 15 people (including you) apply for 7 jobs. What are your chances of getting the job?

    Hi :wave: Allow me to extend my thanks to you all for taking the time to visit this thread. I came across this seemingly simple probability...

    Started by cridex‎, 12-29-2011 12:08 PM
    2 Pages
    1 2
    probability question
    • Replies: 16
    • Views: 7,206
    12-30-2011, 02:39 PM Go to last post
  59. density function

    I have a problem that says: If U is uniform on , find the density function of U^2. So far I have that F(y)=sqrt(y) Where do I go from there?? I...

    Started by vicky‎, 02-17-2009 04:00 PM
    • Replies: 2
    • Views: 7,179
    02-19-2009, 05:18 PM Go to last post
  60. Properties of discrete random variables

    Hello, would some one with more experience mind to confirm or correct me: For discrete random variables I know: E = aE+b and...

    Started by jocali‎, 11-23-2010 08:05 PM
    • Replies: 4
    • Views: 7,144
    11-28-2010, 12:37 PM Go to last post

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