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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: 30,311
    09-30-2005, 09:44 AM Go to last post
  1. is causal & invertible Gaussian ARMA(p,q) process strictly stationary?

    I have the definition of strict stationary, and causal/invertible ARMA(p,q) process. However, I'm having trouble connecting the dots. We know that...

    Started by hanelliot‎, 08-12-2010 03:57 PM
    • Replies: 0
    • Views: 4,284
    08-12-2010, 03:57 PM Go to last post
  2. Maximum Likelihood estimator question

    Hi, I'm stuck on this question... I think I've got part a) and part b) I'm just struggling on how to justify it... It's mainly parts c) and d)...

    Started by neild‎, 08-12-2010 07:25 AM
    • Replies: 1
    • Views: 3,246
    08-12-2010, 12:35 PM Go to last post
  3. Probability of FTSE 250

    My Quantitative Methods exam is tomorrow and I really need help with this question, in case this question comes up in the exam. The question is...

    Started by ap183‎, 08-11-2010 01:56 PM
    • Replies: 1
    • Views: 2,167
    08-11-2010, 02:58 PM Go to last post
  4. Joint Probability question

    Hi, I am stuck on this question. I can do part (a) (I think!) by just multiplying the two pdfs to give: f(x,y)= 8xy if 0<y<x<1 or 0 otherwise....

    Started by neild‎, 08-10-2010 09:08 AM
    • Replies: 3
    • Views: 4,359
    08-11-2010, 09:34 AM Go to last post
  5. Mutually Exclusive

    I can't seem to remember how to determine what P(A|B) is if the two events are determined to be mutually exclusive with probabilities P(A)= 0.3 and...

    Started by badatstats‎, 08-10-2010 04:16 PM
    • Replies: 2
    • Views: 2,507
    08-10-2010, 04:41 PM Go to last post
  6. Interesting Problem

    Anyone know how to do PART II ? PART I. A plant produces bearings with a specified 1-inch mean diameter. The standard deviation for all bearings...

    Started by questionstats30‎, 08-10-2010 01:42 PM
    • Replies: 2
    • Views: 3,252
    08-10-2010, 03:11 PM Go to last post
  7. Chance level binomial, not 1/n

    I have some data which I am going to performed a mixed ANOVA on, however, I think I might need to transform the raw data, but am not sure how to. ...

    Started by thisisnic‎, 08-07-2010 11:24 AM
    • Replies: 5
    • Views: 3,967
    08-10-2010, 09:43 AM Go to last post
  8. Easy Probability Question

    Hi ppl, Im trying to solve to following simple problem but I'm finding it harder than expected. This problem has to be eventually be generalized...

    Started by davmt‎, 07-26-2010 07:08 PM
    • Replies: 6
    • Views: 2,876
    08-09-2010, 08:46 PM Go to last post
  9. Game Entry Statistics

    I am trying to figure out the method of calculating the number of times that a certain game must be entered in order to advance to a specific level...

    Started by bpbenda‎, 08-02-2010 02:57 PM
    • Replies: 3
    • Views: 3,188
    08-09-2010, 01:54 AM Go to last post
  10. null hypothesis questions

    A manufacturer of computer memory chips produces chips in lots of 1000. If nothing has gone wrong in the manufacturing process, at most 7 chips each...

    Started by steve456‎, 08-07-2010 05:37 PM
    • Replies: 6
    • Views: 6,409
    08-08-2010, 04:44 PM Go to last post
  11. EM Algorithm Clustering Nominals

    I am trying to derive the EM algorithm (applied to clustering) for the case where there is a numeric variable assumed to be Gaussian distributed (x1)...

    Started by B_Miner‎, 08-07-2010 08:49 PM
    • Replies: 0
    • Views: 2,155
    08-07-2010, 08:49 PM Go to last post
  12. Probability of catching a chicken

    I have changed this question a bit to make this more interesting, but if I can answer this then I can answer my actual one! I have a net that I...

    Started by farmerdave‎, 08-06-2010 03:13 AM
    • Replies: 2
    • Views: 2,610
    08-06-2010, 10:59 PM Go to last post
  13. question about likelihood function/MLE

    If a random variable Y has the following probability distribution: P (Y = 1) = p, P (Y = 2) = q, and P (Y = 3) = 1−p−q. A random sample of size n...

    Started by messianic‎, 08-04-2010 09:05 PM
    • Replies: 6
    • Views: 4,527
    08-06-2010, 10:25 AM Go to last post
  14. Probability Question

    A question in a tutorial I had was: A bank manager is presented with the details of ten accounts of which two are overdrawn. If he selects three...

    Started by ap183‎, 08-04-2010 12:32 PM
    • Replies: 9
    • Views: 3,029
    08-05-2010, 05:29 PM Go to last post
  15. Expectation Operator

    I understand the Expectation (and the expectation operator) in a very crude sense. For example, when applied to both discrete or continuous...

    Started by jamesmartinn‎, 08-04-2010 09:06 PM
    • Replies: 2
    • Views: 7,118
    08-05-2010, 11:49 AM Go to last post
  16. Writing a book - need help!

    I am writing a book on double deck pinochle and need to get accurate percentages. I am hoping this forum is willing and able to help me! If I am in...

    Started by rakbeater‎, 08-01-2010 08:31 PM
    • Replies: 8
    • Views: 3,977
    08-05-2010, 12:21 AM Go to last post
  17. probability ques.

    a publishing company holds a sales contest in which the top 6 performers out of 97 sales reps receive prizes ranging from a trip to ireland for the...

    Started by yohy20‎, 07-27-2010 10:05 PM
    • Replies: 5
    • Views: 2,494
    08-04-2010, 01:32 PM Go to last post
  18. Probability Question

    Hello, I need a wee help with this question... "A company that repair computers go with the next sale: If the waiting time of a customer for...

    Started by WeeG‎, 08-02-2010 01:44 AM
    • Replies: 7
    • Views: 2,606
    08-04-2010, 11:11 AM Go to last post
  19. Binomial probability problem

    I have a problem working out the answer to this problem using the binomial formula. Assume an airline operates a short haul flight form Edinburgh...

    Started by ap183‎, 08-04-2010 08:12 AM
    • Replies: 4
    • Views: 3,285
    08-04-2010, 10:57 AM Go to last post
  20. Question Likert Scale Data

    To all you statistics geniuses, I have some Likert scale data that I need to analyze. From research, I understand the controversy of using methods...

    Started by Gemini‎, 07-28-2010 03:07 PM
    • Replies: 6
    • Views: 10,029
    08-04-2010, 09:59 AM Go to last post
  21. Probability Function

    Good afternoon people, May I ask for a little assistance solving this exercise ? Thank you... A factory produce pens, with black ink and blue...

    Started by Yankel‎, 08-03-2010 06:45 AM
    • Replies: 3
    • Views: 2,458
    08-04-2010, 02:52 AM Go to last post
  22. Questions (hopefully easy?)

    Itís been a while since Iíve done much probability stuff, but Iíve come across a problem in some auction theory work that Iím doing and was hoping...

    Started by jrfawkes‎, 08-03-2010 07:58 PM
    • Replies: 1
    • Views: 2,171
    08-03-2010, 10:31 PM Go to last post
  23. Probability Problem

    I am not sure where how to do this problem. This is what is says Suppose someone passes you a six sided die and bets £100 that you will through...

    Started by ap183‎, 08-03-2010 04:55 PM
    • Replies: 1
    • Views: 2,064
    08-03-2010, 06:52 PM Go to last post
  24. An abstract mortality question

    A few days ago a 48 year old man died and a 65 year old man did not die. I'm familiar with the mortality tables and the likelihood of, in the US,...

    Started by Outlier‎, 07-29-2010 03:05 PM
    • Replies: 2
    • Views: 3,018
    08-03-2010, 02:09 PM Go to last post
  25. Simple question but cant figure it out

    A = a random number between x and 100 B = a random number between y and 100 What is the chance that A has a higher number than B? Solution...

    Started by DnDiene‎, 08-02-2010 05:23 AM
    • Replies: 1
    • Views: 3,338
    08-03-2010, 12:48 PM Go to last post
  26. Determining number of samples to collect

    Hi, I am doing a project in determining if there is a statistically significant difference between conducting a particular type of cleaning process...

    Started by mulamootil‎, 07-30-2010 02:15 PM
    • Replies: 1
    • Views: 3,518
    08-03-2010, 12:11 PM Go to last post
  27. Poisson distribution

    The number of cars that pass Bill's house between 8.00am and 9.00am on a normal week day follows a poisson process with rate 6 cars every 5 minutes....

    Started by Cookie‎, 08-03-2010 06:06 AM
    • Replies: 2
    • Views: 3,417
    08-03-2010, 10:13 AM Go to last post
  28. Hard Probability Question

    Hello, I have another probability question, harder this time (I think). I am attaching 2 pictures, one of the question and 1 of my attempt to...

    Started by WeeG‎, 08-03-2010 04:04 AM
    • Replies: 2
    • Views: 2,326
    08-03-2010, 05:29 AM Go to last post
  29. Statistics question for algorithm development

    Hi, This isn't a homework help question. I'm actually trying to figure out some formulas for algorithm programming. I'm trying to calculate...

    Started by mcmurphy510‎, 08-02-2010 04:33 PM
    • Replies: 0
    • Views: 2,286
    08-02-2010, 04:33 PM Go to last post
  30. Joint Distribution

    Hello, I got this question plus a solution and I think the solution is wrong, I would like to see your solution.... The CD's produced by a company...

    Started by WeeG‎, 08-02-2010 03:49 PM
    • Replies: 0
    • Views: 2,101
    08-02-2010, 03:49 PM Go to last post
  31. Testing statistical signifigance

    I have a problem that I'm totally stumped on. I have a test tonight and I need to know how to do this problem because one like it will be on the...

    Started by ih8stats‎, 08-02-2010 12:53 PM
    • Replies: 0
    • Views: 2,252
    08-02-2010, 12:53 PM Go to last post
  32. Question approximating density function for a non-normal distribution

    Hello, My question is actually quite short, but I'll have to start by describing the context since I am not sure how to directly ask it. ...

    Started by davidbr‎, 07-31-2010 01:26 PM
    • Replies: 1
    • Views: 4,028
    08-01-2010, 11:18 PM Go to last post
  33. Bound on the difference of two normal cds

    Let Xi be univariate normal variables with means mi and standard deviations di, with i = 1,2. Suppose |m1-m2| < e1 and |d1 - d2| < e2. I need an...

    Started by amsb‎, 07-31-2010 03:09 PM
    • Replies: 2
    • Views: 2,922
    08-01-2010, 04:30 PM Go to last post
  34. Rotated Ellipses

    Hi all, I've been thinking about this problem for a while, and I haven't been able to find a good starting point. This may be more of a...

    Started by ajm12‎, 07-28-2010 09:49 AM
    • Replies: 0
    • Views: 2,490
    07-28-2010, 09:49 AM Go to last post
  35. prob.

    how many different 10-letter words (real or imaginary) can be formed from the letters in the word MONOCHROME? okay, so I did this by doing...

    Started by yohy20‎, 07-27-2010 10:00 PM
    • Replies: 6
    • Views: 2,772
    07-27-2010, 11:02 PM Go to last post
  36. Settle an Argument

    A social club has a daily contest where they draw a name from a list of all of the club members. A name is drawn each day. In order to win, you must...

    Started by ScottWH‎, 07-23-2010 06:32 AM
    2 Pages
    1 2
    • Replies: 19
    • Views: 5,571
    07-27-2010, 07:22 PM Go to last post
  37. Binomial distribution confusion.

    Hello all. I am having a bit of confusion taking the conditional expectation of a binomial cumulative distribution. Lets say the probability of a...

    Started by Salohcin‎, 07-26-2010 01:31 PM
    • Replies: 1
    • Views: 3,023
    07-27-2010, 03:03 AM Go to last post
  38. Multinomial Distribution - difficult question - SOS

    This has to do with statistics,but the question I don't know the answer to is in probability. I don't know how to solve (b) Please help...

    Started by andrea_lansberg‎, 07-25-2010 04:59 AM
    • Replies: 0
    • Views: 3,089
    07-25-2010, 04:59 AM Go to last post
  39. equip. failure

    A widget fails each month for six months. A fix is then installed. How many months of no failures would need to go by before I can be 95%...

    Started by Outlier‎, 07-22-2010 12:39 PM
    • Replies: 5
    • Views: 3,154
    07-23-2010, 10:52 AM Go to last post
  40. help -probablity problem

    Hello every one , i just registered to this forum .Currently i am studying stats , Can you please help me on how to solve bellow problem : ...

    Started by newp‎, 07-23-2010 04:12 AM
    • Replies: 2
    • Views: 2,804
    07-23-2010, 10:12 AM Go to last post
  41. what's the probability that x^2+bx+c=0 has real root?

    can any one answer this one?

    Started by tennis89‎, 07-19-2010 09:10 PM
    • Replies: 3
    • Views: 4,581
    07-20-2010, 05:47 AM Go to last post
  42. Uniform Continuous Probability

    Hi all, The question i have has these givens: t = years f(t) = 10(1-5t) for 0=< t =< 1/5 a) What is probability that a machine will last...

    Started by c2q‎, 07-19-2010 09:02 PM
    • Replies: 5
    • Views: 5,204
    07-19-2010, 11:18 PM Go to last post
  43. This is probably easy for you

    I am not a statistics person. A friend of mine and I were chatting over a beer and were trying to figure the following problem out. Given our lack...

    Started by Sailr‎, 07-18-2010 10:10 PM
    • Replies: 2
    • Views: 3,452
    07-19-2010, 02:32 PM Go to last post
  44. technical VS biological replicates (compare means)

    Hi, I have conducted an experiment with an assay for 2 biological classes, each consisting of 10 unique members. I did the assay 3 times for a...

    Started by endocardium‎, 07-17-2010 11:54 PM
    • Replies: 4
    • Views: 14,044
    07-18-2010, 05:49 PM Go to last post
  45. Distribution Fitting Question

    Hi Math Experts, I have a two part question: Let's say I have a set of data and I want to fit a distribution to it, but I have to get rid of all...

    Started by lagfish‎, 07-18-2010 06:53 AM
    • Replies: 2
    • Views: 3,582
    07-18-2010, 04:28 PM Go to last post
  46. Percentiles question

    Hi, I'm a novice at probability theory and am hoping for some help on a betting question. If I place a losing bet then the loss will always be...

    Started by redart‎, 07-12-2010 09:26 PM
    • Replies: 1
    • Views: 3,226
    07-16-2010, 08:10 PM Go to last post
  47. introduction to stochastic process by by Hoel, Port and Stone.

    those any one have this text. i have gone through all the questions in chapter 1 except for two prove questions. no 27 and 26 i am lost

    Started by colltie‎, 01-26-2009 11:40 AM
    • Replies: 6
    • Views: 13,144
    07-16-2010, 02:05 PM Go to last post
  48. Bejeweled Combos

    Hi all, Many of you I assume are familiar with Bejeweled, a puzzle game in which the player swaps neighboring, colored gems in an 8 x 8 grid to...

    Started by ajile‎, 07-16-2010 10:41 AM
    • Replies: 2
    • Views: 4,065
    07-16-2010, 12:08 PM Go to last post
  49. A probability question

    a stick of length 1 is cut twice randomly, probability that 3 segments can form a triangle? x,y, 1-x-y x+y>1-x-y ==> x+y>1/2 1-x-y+x>y ==>...

    Started by tennis89‎, 07-09-2010 02:17 PM
    • Replies: 5
    • Views: 3,301
    07-16-2010, 12:01 PM Go to last post
  50. Binomial Distribution as N goes to Infinity

    I know that the Central Limit Theorem says that all types of distributions go to normal distribution as N goes to infinity. However, is there some...

    Started by messianic‎, 07-15-2010 04:38 PM
    • Replies: 6
    • Views: 9,184
    07-15-2010, 07:36 PM Go to last post
  51. Normal distributions

    I have been using my TI 84 Plus Silver Edition calculator to try and figure this out with no luck :-( Can anyone help? Assume that the heights of...

    Started by jerttehcamper‎, 07-14-2010 07:22 PM
    • Replies: 7
    • Views: 5,873
    07-15-2010, 01:58 PM Go to last post
  52. testing hypotheses

    Out of an i.i.d sample, with N = 200, and a sample mean of 7000 and sample variance of 700, how would you answer the following question, At 5%...

    Started by messianic‎, 07-14-2010 01:14 PM
    • Replies: 5
    • Views: 3,305
    07-14-2010, 05:20 PM Go to last post
  53. Game Probability

    Hi All - I have not looked at statistics or probability for a number of years but am wondering if someone can provide me with a formula for figuring...

    Started by acas‎, 07-14-2010 08:58 AM
    • Replies: 4
    • Views: 4,067
    07-14-2010, 12:26 PM Go to last post
  54. question about binomial distribution

    If the probability distribution of Y is defined by a binomial distribution, what would be the limiting distribution of Y/n as n approaches infinity?...

    Started by messianic‎, 07-13-2010 07:47 PM
    • Replies: 3
    • Views: 4,099
    07-13-2010, 09:26 PM Go to last post
  55. Discrete Random Variables

    Its asking to complete the chart. Since its probability I added it up to have a one but the other chart has a negative does that mean that it can't...

    Started by badatstats‎, 07-12-2010 08:30 PM
    • Replies: 4
    • Views: 3,284
    07-12-2010, 09:10 PM Go to last post
  56. simple chi-squared problem

    This is probably a very simple problem Y is distributed by the chi-squared distribution with 5 degrees of freedom. Calculate the probability that...

    Started by messianic‎, 07-12-2010 08:24 PM
    • Replies: 2
    • Views: 2,937
    07-12-2010, 09:00 PM Go to last post
  57. Maximum of a set of independent normal random variables

    Consider a set of random variables X_1, X_2, X_3, \ldots, X_n with unit varience but different means: \mu_1, \mu_2, \mu_3, \ldots, \mu_n . What...

    Started by mightymergz‎, 07-08-2010 02:50 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 20,571
    07-12-2010, 03:45 PM Go to last post
  58. Transformations

    Hi! Suppose X ~ U(0,1). If we let Y = -ln (x) and then find the density of Y, we get the exponential distribution (with rate parameter = 1). ...

    Started by jamesmartinn‎, 07-12-2010 12:01 AM
    • Replies: 4
    • Views: 4,619
    07-12-2010, 03:28 PM Go to last post
  59. Gambler's fallacy

    Hi everybody. I have a question about the gambler's fallacy application. I have this board game called "Talisman", where each player has an attribute...

    Started by joseph0000‎, 07-11-2010 11:45 AM
    • Replies: 10
    • Views: 3,866
    07-11-2010, 11:44 PM Go to last post
  60. Conditional Probability

    What is the chance that the seventh card from the top of the deck will be a heart? This question really stumped me. I thought and then divided by...

    Started by Luis Felipe‎, 07-11-2010 10:31 AM
    • Replies: 5
    • Views: 4,633
    07-11-2010, 02:49 PM Go to last post

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