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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: 30,333
    09-30-2005, 09:44 AM Go to last post
  1. Sensitivity and specificity calculation seems too low.

    Hi, Just working through this sensitivity and specificity problem and the answer I obtain seems incredibly low. Might one show where my error is?...

    Started by S-C-3-1-3‎, 12-06-2012 11:00 PM
    • Replies: 4
    • Views: 1,870
    12-07-2012, 10:02 AM Go to last post
  2. How do I figure out the E[X]?

    Consider a game called “Money Bags”. The game consists of drawing from a bag filled with (25) twenty five chips with different values: • (1) One...

    Started by Dazed‎, 12-07-2012 02:52 AM
    • Replies: 1
    • Views: 2,610
    12-07-2012, 03:40 AM Go to last post
  3. Calculating moment generation function: Set up correctly, need help with integral!

    Hi, I’ve reached a dead end in calculating this moment generating function. f(x) = 2e^{2-2x}, x > 1 ...

    Started by S-C-3-1-3‎, 12-05-2012 11:05 PM
    • Replies: 1
    • Views: 1,468
    12-05-2012, 11:16 PM Go to last post
  4. Probability that a person responds~ Please help!!!

    Hey everyone! let me first say this forum has been a great help to me. I'm having trouble with this question. I have the answer but I'm not...

    Started by esmile‎, 12-05-2012 09:06 PM
    • Replies: 2
    • Views: 1,635
    12-05-2012, 09:37 PM Go to last post
  5. Find distribution function of Y given density function of X and Y as a function of X.

    Hello! Let X have the density function f(x)=2x, 0 < x < 1 and Y = 2X + 1 Find the distribution function of Y, F_Y . I solved X =...

    Started by Slime‎, 12-04-2012 11:00 PM
    • Replies: 7
    • Views: 2,951
    12-05-2012, 01:20 PM Go to last post
  6. Exclamation Joint distributions

    Don't suppose anyone can help me with this question? Suppose that birds have each time a random number X of eggs uniformly distributed in...

    Started by rozza‎, 12-05-2012 08:53 AM
    • Replies: 1
    • Views: 1,737
    12-05-2012, 09:03 AM Go to last post
  7. Answer to Simple Prob Assignment

    This problem concerns MGB Problem 1 of Chapter 1: "One urn contains one black ball and one gold ball. A second urn contains one white and one gold...

    Started by statisticsnewbie‎, 12-05-2012 06:53 AM
    assignment, omega, probability, sample space
    • Replies: 3
    • Views: 2,560
    12-05-2012, 07:27 AM Go to last post
  8. Probability of waiting time

    Hi, I am trying to solve these problems. I did the first one correctly, but when I do the others in a similar fashion, I get the incorrect answer....

    Started by S-C-3-1-3‎, 12-05-2012 02:00 AM
    • Replies: 1
    • Views: 1,499
    12-05-2012, 02:58 AM Go to last post
  9. Find P.D.F of U and V.

    Hey, I have this problem for a review sheet and am not completely sure how to proceed. The joint density function of X nd Y is given by ...

    Started by Slime‎, 12-04-2012 12:33 AM
    • Replies: 4
    • Views: 2,795
    12-04-2012, 09:28 PM Go to last post
  10. Q-Q plot equivalent for discrete variable?

    Hello, You can use a Q-Q plot to visually test if 2 continuous variables are from the same distribution and you get a straight line. Is there...

    Started by bradyj2‎, 12-04-2012 08:05 AM
    • Replies: 0
    • Views: 2,351
    12-04-2012, 08:05 AM Go to last post
  11. Wine tasting - random selection

    Can you tell me if my reasoning is correct, please. If I'm mistaken, please explain why. If I am correct, can you tell me another way to look at...

    Started by mrmac‎, 12-02-2012 06:26 PM
    • Replies: 1
    • Views: 925
    12-02-2012, 06:27 PM Go to last post
  12. Same grade assigned by 3 Professors - highly subjective assessment (M.Sc. interview)

    UPDATE: sorry, there is a name for the issue, "Inter-rater reliability" of which I was unaware of. I found it in a book by Hughes, A., Testing for...

    Started by terrenobosque‎, 12-01-2012 03:48 PM
    • Replies: 0
    • Views: 1,328
    12-01-2012, 03:48 PM Go to last post
  13. Probability of demand?

    Hi all, demand table is given below(Note: Period is 12 years). So according to the data, I understand that the yearly demand will be between...

    Started by fomenter‎, 11-30-2012 10:42 PM
    • Replies: 3
    • Views: 2,629
    11-30-2012, 11:01 PM Go to last post
  14. Arrow Probability/chance question

    CREA puts the average price at which a house was sold in Canada in 2010 at $339,100. Let us assume that the standard deviation of the house prices is...

    Started by yelloo‎, 11-28-2012 03:22 PM
    • Replies: 2
    • Views: 2,779
    11-30-2012, 08:59 PM Go to last post
  15. Deriving posterior probability from frequencies

    I'm working through an introductory Bayesian stats text: Doing Bayesian Analysis. Having been away from stats for a while and having never working...

    Started by davidbgonzalez‎, 03-02-2011 07:13 PM
    bayesian, probability question
    • Replies: 5
    • Views: 3,592
    11-29-2012, 01:15 PM Go to last post
  16. Defining a problem with random variables.

    I am studying the following problem. Take n random normal distributions each with a common standard deviation of s. Call these d(1), d(2)...d(n)....

    Started by Steve Tilley‎, 11-29-2012 12:24 PM
    • Replies: 0
    • Views: 1,776
    11-29-2012, 12:24 PM Go to last post
  17. Roulette probability

    I am really struggling with this.... any help will be greatly appreciated Consider the following three methods of betting reds on a roulette...

    Started by coolgirl2004‎, 11-28-2012 08:59 PM
    probability, roulette
    • Replies: 1
    • Views: 1,935
    11-28-2012, 09:08 PM Go to last post
  18. chances of going first in.. pokemon??!

    ha did the title draw you in? good, cause this is a tricky one. you don't need to know much of anything about Pokemon cards to solve this problem. ...

    Started by trickyhao‎, 11-28-2012 02:18 PM
    • Replies: 3
    • Views: 1,857
    11-28-2012, 05:46 PM Go to last post
  19. Arrow Tax question help!

    When the BC Government introduced a carbon tax in 2008, it did not want to lose votes as might easily happen with a new tax. They therefore...

    Started by yelloo‎, 11-28-2012 03:23 PM
    • Replies: 1
    • Views: 1,576
    11-28-2012, 04:38 PM Go to last post
  20. Duplicate sample probability

    I have a population of N unique items, and I take n random samples (with replacement, so some items may be sampled more than once). If I then take...

    Started by emmental‎, 11-26-2012 06:46 PM
    duplication, sample
    • Replies: 8
    • Views: 4,483
    11-28-2012, 07:37 AM Go to last post
  21. PLEASE Help

    Hi, I tried to solve this question, but i could not understand it .If you know how to solve it, i will appreciate your help. Here is the...

    Started by james12‎, 11-27-2012 11:24 PM
    • Replies: 1
    • Views: 1,653
    11-27-2012, 11:30 PM Go to last post
  22. Simple but convoluted probability help

    For my assignment, I'm working on producing a predictive model of probability based on "historic performance", for want of a better description. I...

    Started by cambleu‎, 11-27-2012 07:57 AM
    • Replies: 3
    • Views: 1,706
    11-27-2012, 10:10 AM Go to last post
  23. GLS estimation in SAS or SHAZAM Econometrics

    I've spent a long time looking for this so I thought I'd post for some help. C1i = β1+β2Q1i+β3(Q1i)^2+β4(Q1i)^3+εi, Var(εi) = σ^2*Q1i there are 28...

    Started by alias‎, 11-26-2012 01:47 PM
    • Replies: 9
    • Views: 6,721
    11-27-2012, 09:08 AM Go to last post
  24. Red face Normal Approximation probability question

    Consider a four-sided die loaded so that 1 shows 40% of the time. If we roll this die 50,1000,2000,4000,8000 times, find the probability in each...

    Started by devimon‎, 11-26-2012 07:51 PM
    four-sided loaded die, normal approximation, probability
    • Replies: 1
    • Views: 2,137
    11-27-2012, 02:52 AM Go to last post
  25. Markov chain: probability of visiting all states before absorption

    Hi all, I have the following Markov chain \begin{tabular}{cccc} 0 &0.5 &0 &0.5\\ 0.5 &0 &0.5 &0\\ 0 &0 ...

    Started by tekkenlord‎, 11-25-2012 05:04 PM
    • Replies: 1
    • Views: 2,640
    11-26-2012, 01:45 PM Go to last post
  26. Sampling Distributions help

    Hi, I'm teaching myself stats but have no idea on how to solve these, any help would be appreciated. When a pizza restaurant’s delivery process is...

    Started by franklinexpress‎, 11-25-2012 03:34 PM
    distribution, sampling
    • Replies: 12
    • Views: 1,736
    11-26-2012, 11:07 AM Go to last post
  27. probability of control with and withour replacement

    The control desk for a spare part examines a sample of 5 units of each batch and reject if it finds more than 2 defective. A vendor delivers a...

    Started by mkreder‎, 11-25-2012 12:08 PM
    • Replies: 2
    • Views: 1,068
    11-26-2012, 09:38 AM Go to last post
  28. I'm confused on probability density functions - please help!!

    These questions are from a sample test, I don't know how to do them. Obviously there's a lot of questions so I'm not expecting people to do them for...

    Started by nnikkiiiiii‎, 11-26-2012 04:26 AM
    probability, probability distribution, probability function
    • Replies: 1
    • Views: 1,796
    11-26-2012, 05:01 AM Go to last post
  29. Lightbulb Normal Approximation question

    1) A fair coin is tossed 600 times. What is the probability that the number of heads will be between 290 and 310? (I have the answer, but I need...

    Started by devimon‎, 11-26-2012 02:24 AM
    coin toss, heads, normal approximation, probability
    • Replies: 1
    • Views: 1,203
    11-26-2012, 04:01 AM Go to last post
  30. Continuous distribution function

    I have a problem (actually two of them) where i am confused on what it requires. It states: Y is a continuous random variable on the interval...

    Started by tsamocki‎, 11-24-2012 05:40 PM
    • Replies: 1
    • Views: 1,139
    11-25-2012, 02:51 PM Go to last post
  31. Help with probability, sample mean & standard deviation

    Can anyone help me on how to do this problem? I'm so confused

    Started by Laura123‎, 11-23-2012 11:02 PM
    probability, sample size, standard deviation
    • Replies: 1
    • Views: 1,419
    11-24-2012, 04:47 AM Go to last post
  32. Markov chain hitting time

    Hi, I am trying to compute the hitting time of Markov chain. The way I formulated the problem is, what is the time to to hit state j (j in E) for...

    Started by adnaniut‎, 11-24-2012 03:02 AM
    hitting time, markov chain
    • Replies: 2
    • Views: 1,557
    11-24-2012, 04:14 AM Go to last post
  33. 1 out 101

    Hi, I am hoping that someone can help me out with this? If I have 54 numbers on a roulette table, and there is a random generator picking the...

    Started by simon check‎, 11-22-2012 03:07 PM
    • Replies: 2
    • Views: 1,394
    11-23-2012, 05:28 AM Go to last post
  34. Variance of Marginal effects

    I am trying to find Var(β3+xβ4+xβ5) where the x's are ages (20,30,40,50,55) The Marginal Function is: 14.09616 - 0.47037AGE + 0.0042AGE^2 I just...

    Started by alias‎, 11-22-2012 02:36 PM
    • Replies: 4
    • Views: 2,737
    11-22-2012, 11:17 PM Go to last post
  35. What is the probability for the second half of the question posted?

    I ran into this blog posting about russian roulette http://bayesianthink.blogspot.com/2012/11/winning-at-russian-roulette.html Curious to know...

    Started by matrix_testing_ans‎, 11-22-2012 01:50 PM
    probabilty, puzzles
    • Replies: 1
    • Views: 1,165
    11-22-2012, 05:33 PM Go to last post
  36. how to compare different normal distributions: chance of winning in a popular game

    A, B, C, and D play a game, in which scores follow a normal distribution A's mean score is 34 (sd 3), B mean 33 (sd 3.5), C mean 32 (sd 4), D mean...

    Started by caralee‎, 11-20-2012 12:35 PM
    • Replies: 9
    • Views: 2,168
    11-22-2012, 05:09 PM Go to last post
  37. Standard Deviation and Mean

    The question is: In order to test a theory about the development of a disease, suppose that we have to nd patients with Blood Group B, which...

    Started by masamoah23‎, 11-19-2012 04:39 PM
    • Replies: 2
    • Views: 1,429
    11-22-2012, 12:54 PM Go to last post
  38. simple random walk

    Hi all, I've a question for u... the mathematical model that explains the experiment of tossing a fair coin is the simple random walk,...

    Started by ang‎, 11-21-2012 10:54 AM
    • Replies: 1
    • Views: 872
    11-21-2012, 11:37 AM Go to last post
  39. How do you solve this probability question?

    Suppose you wish to estimate the difference between the mean acidity for rainfalls at two different locations, one in a relatively unpolluted area...

    Started by jessicasamide‎, 11-19-2012 09:01 PM
    • Replies: 1
    • Views: 3,302
    11-19-2012, 09:29 PM Go to last post
  40. Regresssion to the mean + independant events = confusion

    From my limited understanding of probability, I see fair coin tosses to be independent events. Each time I flip a fair coin the odds are 50% for...

    Started by joeshmo‎, 11-19-2012 04:34 PM
    • Replies: 2
    • Views: 1,182
    11-19-2012, 05:04 PM Go to last post
  41. Continuous probability problem

    Hello I have a probability problem, which I have solved, but I am not sure. I have a circle with radius r. I want to know what is the...

    Started by Yankel‎, 11-19-2012 03:03 PM
    • Replies: 4
    • Views: 1,113
    11-19-2012, 04:09 PM Go to last post
  42. Question About example in Probability!

    The waiter in charge of the Mechelsestraat pizzeria systematically under-reports the amount of tips he receives from customers: in fact, for every n...

    Started by gatto‎, 11-18-2012 09:43 PM
    • Replies: 2
    • Views: 1,007
    11-19-2012, 12:25 PM Go to last post
  43. probability of damaging vs. fixing a device by random operations

    Hello all, It is obviously easier to damage than to fix a device. But how can I express these two different probabilities by random operation? ...

    Started by jaked‎, 11-18-2012 02:20 AM
    • Replies: 0
    • Views: 1,060
    11-18-2012, 02:20 AM Go to last post
  44. Covariance question without using integrals

    Hello, I am trying to figure out a way to do the following question without using integrals. X is distributed as Unif with Y=-log(X). Find...

    Started by GTaiko‎, 11-17-2012 10:42 PM
    • Replies: 4
    • Views: 2,457
    11-18-2012, 01:51 AM Go to last post
  45. Probability hw!

    I really really need some help! A federal agent is deciding which of the two waste dump projects to investigate. A top administrator estimates that...

    Started by sea1893‎, 11-17-2012 01:47 PM
    probability
    • Replies: 1
    • Views: 1,091
    11-17-2012, 04:41 PM Go to last post
  46. Question Basic Standard Deviation question

    Main information: Studies of the term birth weight (>37 weeks) of babies born in NZ show that the weight of European ethnicity babies is normally...

    Started by successfulfailure‎, 11-15-2012 07:50 PM
    • Replies: 1
    • Views: 1,396
    11-17-2012, 12:13 AM Go to last post
  47. Cool Odds of a certain 5 character string occurring in a random string of 512.

    I work in security and recently had a false positive happen where a certain word that was being tested occurred in the session id. Matching is not...

    Started by johnebgood‎, 11-15-2012 02:55 PM
    occurrence, odds, security, string, substring
    • Replies: 13
    • Views: 2,986
    11-16-2012, 09:51 PM Go to last post
  48. Not sure of the limits of integration in this problem!

    Hi, The question is as follows: If X and Y are independent and f(x) = 1/2 when 0<X<2 and f(y) = 2Y when 0<Y<1, find P(X<2Y). My attempt: ...

    Started by S-C-3-1-3‎, 11-15-2012 09:01 PM
    • Replies: 3
    • Views: 1,391
    11-16-2012, 12:26 PM Go to last post
  49. Combining standard deviation/normal distribution (do I have this right?)

    I have a variable with a mean of 52% and a standard deviation of 2.5%. However, the 52% mean was derived from an opinion poll which itself has a 3%...

    Started by provocateur‎, 11-16-2012 11:28 AM
    margin of error, normal distribution, standard deviation
    • Replies: 0
    • Views: 1,429
    11-16-2012, 11:28 AM Go to last post
  50. Probability of journey times

    Hello, If you assume that the average speed of car will be 30km/hr when making a journey. A journey distance is 10 km. You therefore...

    Started by bradyj2‎, 11-16-2012 08:29 AM
    • Replies: 3
    • Views: 1,661
    11-16-2012, 11:17 AM Go to last post
  51. What are our chances of winning the prize draw?!

    Hi, I have a problem that we are having trouble solving There are 3000 entries that are put into a prize draw. Our team has 30 of those...

    Started by Pronenebula‎, 11-16-2012 05:56 AM
    • Replies: 1
    • Views: 1,248
    11-16-2012, 07:17 AM Go to last post
  52. Conditional Probability Questions

    Hey guys, pretty simple question here (for yall I hope).... I'm trying to calculate a conditional probability, but I'm drawing the probabilities...

    Started by Mark G‎, 11-15-2012 05:32 PM
    • Replies: 2
    • Views: 1,480
    11-15-2012, 09:40 PM Go to last post
  53. Pseudo-observations

    Hi, I need help in understand what pseudo-observations actually are, (what transformation have they taken) and I need to know about the...

    Started by gino492‎, 11-15-2012 09:07 AM
    • Replies: 0
    • Views: 2,880
    11-15-2012, 09:07 AM Go to last post
  54. Interpret odds ratio between 0 and 1 in plain english

    Dear all, I am looking to the relationship between a credit rating downgrade (for example from AA- to A+) and Acquisitions. my independent...

    Started by oseroser‎, 11-14-2012 10:35 AM
    • Replies: 2
    • Views: 3,824
    11-15-2012, 07:04 AM Go to last post
  55. help with a problem

    If P(AUB)=.76 and P(AUB')=.87 Find P(A). I have tried to work this problem and got an answer of .065 but the proper one is .063. Can someone please...

    Started by mickser‎, 11-14-2012 10:54 PM
    • Replies: 1
    • Views: 2,263
    11-15-2012, 02:36 AM Go to last post
  56. Hypergeometric distribution shortcut?

    Hello, First of all, I am not taking a class on probability. I have been studying it on my own due to its relevance in certain areas of personal...

    Started by JohannineLogos‎, 11-12-2012 09:42 PM
    • Replies: 2
    • Views: 1,811
    11-13-2012, 10:56 AM Go to last post
  57. General Probability Question

    Hi, I was wondering why one of the solutions to my answers says P(t>=2) = 1-P(t<=1), and another solution for a different problem says...

    Started by S-C-3-1-3‎, 11-12-2012 03:37 PM
    • Replies: 6
    • Views: 1,164
    11-13-2012, 12:05 AM Go to last post
  58. Probability Brain Teaser

    You have 6 pairs of socks - 2 white, 2 black, 2 green You need a matching pair in either white or black - but the lights are out, so you have to...

    Started by atldevilz‎, 11-12-2012 08:42 PM
    brain teaser, probability help
    • Replies: 3
    • Views: 1,457
    11-12-2012, 10:00 PM Go to last post
  59. Proving of probability

    Hello! I'm new to this site, so I hope this is the right category to post my question. So here's the deal: in class we get almost only theory, very...

    Started by depressor‎, 11-12-2012 02:06 PM
    • Replies: 4
    • Views: 1,466
    11-12-2012, 04:25 PM Go to last post
  60. Help with probablility distribution.

    Probability 1.* Suppose that the mean of the annual return for common stocks from 1950 to 2012 was 10.4%, and the standard deviation of the annual...

    Started by SHOUCK‎, 11-12-2012 03:16 PM
    • Replies: 1
    • Views: 1,809
    11-12-2012, 03:39 PM Go to last post

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