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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: 30,322
    09-30-2005, 09:44 AM Go to last post
  1. Question UK Sports Sweepstake Question

    Hi, my friends have been having many conversations on the following subject and can't seem to find an answer anywhere and now we have a little...

    Started by colonelvern‎, 01-12-2010 02:04 PM
    • Replies: 2
    • Views: 3,780
    01-17-2010, 10:39 AM Go to last post
  2. Some more Poisson type questions

    Hi! I would greatly appreciate if someone could look these over for me: Suppose Oils spills off the coast of BC in any given year has a Poisson...

    Started by jamesmartinn‎, 01-15-2010 04:16 PM
    • Replies: 1
    • Views: 2,378
    01-15-2010, 07:07 PM Go to last post
  3. Verify type question

    Verify that if X ~ Poisson (mu1) independently of Y ~ Poisson (mu2), then the conditional distribution of X given that X + Y = n is Binomial on n...

    Started by jamesmartinn‎, 01-14-2010 05:10 PM
    • Replies: 4
    • Views: 3,009
    01-15-2010, 03:16 PM Go to last post
  4. Smile Restaurant Grand Opening probability question

    Hi, i was wondering if anyone could help me figure out something. Here is the situation: There is a chain restaurant that has grand openings in new...

    Started by johnmichael‎, 01-10-2010 11:40 AM
    • Replies: 6
    • Views: 3,206
    01-15-2010, 01:42 PM Go to last post
  5. Help Please!

    Hi, I have a probability question for my Uni Stats course, and I'm having a bit of trouble figuring out what to do. If someone could help, that...

    Started by Caitlin‎, 01-10-2010 06:32 PM
    • Replies: 0
    • Views: 1,880
    01-10-2010, 06:32 PM Go to last post
  6. Poisson Question

    Got a question here about an antenna designed to withstand 50mph wind ( 20m abover ground) the 50mph wind occurs once every 30 years on average. What...

    Started by Yvonne M‎, 01-10-2010 11:40 AM
    • Replies: 5
    • Views: 2,698
    01-10-2010, 03:50 PM Go to last post
  7. binomial distribution

    If every person tossed a coin 5 times, what is the probability of observing 5 tails if there are 1000 people? i can work out the answer if only...

    Started by Yvonne M‎, 01-10-2010 03:16 PM
    • Replies: 1
    • Views: 2,913
    01-10-2010, 03:49 PM Go to last post
  8. Trouble with diagnosis probability

    Having an absolute nightmare as part of my Nautical Science Honours course... I'm no statistician! Need to find a solution for this problem, can...

    Started by Adam_D‎, 01-10-2010 09:17 AM
    • Replies: 2
    • Views: 2,686
    01-10-2010, 12:34 PM Go to last post
  9. Poisson Distribution

    Hi: I was wondering if there is a proof (or reference) for the following property of the Poisson distribution: Go here, ...

    Started by jamesmartinn‎, 01-07-2010 08:26 PM
    • Replies: 2
    • Views: 6,339
    01-08-2010, 09:54 AM Go to last post
  10. ex(xy)

    Hi, i can't figure out how do i calculate e(xy) in cases they are not independent and lets say they have the same distribution, for instant...

    Started by zhenyazh‎, 01-06-2010 01:47 AM
    • Replies: 1
    • Views: 11,324
    01-08-2010, 08:36 AM Go to last post
  11. Question Need HEEEELP!!! with historical corpus analysis

    Hei cracks out there! Though I am a great fan of statistics - and statisticians :tup: - I have so far only made it to an introductory course. So I...

    Started by luckyjoe‎, 01-07-2010 08:54 AM
    • Replies: 0
    • Views: 3,012
    01-07-2010, 08:54 AM Go to last post
  12. Z scores .. please help

    there is two problems that i can answer .. 1) Processing of the ceramic alloy involves a sintering ( firing ) process which produces a dense hard...

    Started by paul2009‎, 01-03-2010 02:10 PM
    • Replies: 4
    • Views: 3,090
    01-06-2010, 02:00 PM Go to last post
  13. Quantifying response with variable length history

    I have what I hope is a common a statistics problem. In our non-profit organization we occasionally send people direct mail appeals. The goal is to...

    Started by andrewz‎, 01-05-2010 08:05 PM
    • Replies: 0
    • Views: 2,152
    01-05-2010, 08:05 PM Go to last post
  14. predictions

    hi, when i am asked to give a prediction about X in which cases i use what: 1. most probable x 2. e(x) 3.e(x|y) 4. x=ay+b thanks

    Started by zhenyazh‎, 01-01-2010 07:21 AM
    • Replies: 1
    • Views: 2,747
    01-01-2010, 07:28 PM Go to last post
  15. help with some question

    hi there are some questions i was unable to solve. i will describe them and say where exactly my problem is. 1. a fair cube (with six surfaces) is...

    Started by zhenyazh‎, 12-29-2009 04:13 AM
    • Replies: 2
    • Views: 2,373
    12-30-2009, 04:16 AM Go to last post
  16. random numbers vs dice

    Hi my stats knowledge is sufficient to think of this problem but insufficient to get the answer, and its annoying me! Assume I have 46656 base 6...

    Started by nick37‎, 12-26-2009 04:55 PM
    • Replies: 4
    • Views: 4,467
    12-28-2009, 12:30 AM Go to last post
  17. Question Statistics Research Process - Please help

    :confused: Hello Stat-helpers, I am currently taking a Statistics course online, which I am learning solo and need your assistance. I am a quick...

    Started by Bella Love‎, 12-27-2009 05:06 AM
    • Replies: 0
    • Views: 7,084
    12-27-2009, 05:06 AM Go to last post
  18. Pearson 5 (inverse Gamma) and Apha/Beta

    Hi everyone !! I'm a newby actually, so I hope you'll understand my problem here :) I have a serie of data (the times spent by a car at a...

    Started by TheSwiss‎, 12-05-2009 04:15 PM
    • Replies: 1
    • Views: 4,411
    12-26-2009, 11:04 PM Go to last post
  19. HELP! P with percentages...3 problems

    :) 1. A researcher wishes to conduct a study of the color preferences of new car buyers. Suppose that 40% of this populatin prefers the color red....

    Started by mathmoron‎, 12-14-2009 08:23 AM
    • Replies: 2
    • Views: 10,029
    12-26-2009, 10:45 PM Go to last post
  20. Bowling - determining the probability of beating the other guy...

    Let's say bowler A and bowler B are going to face off in one match (string) in a single-elimination tournament. The higher score moves on. Over...

    Started by pfisch77‎, 12-17-2009 10:49 PM
    • Replies: 2
    • Views: 3,597
    12-26-2009, 02:34 PM Go to last post
  21. Basic Combination problem

    Hey guys i am really stuck on this problem: At a recent gathering there were 7 musicians, 10 teachers, and 3 accountants, all noted for their love...

    Started by fred_720‎, 12-14-2009 01:14 PM
    • Replies: 1
    • Views: 2,562
    12-26-2009, 02:17 PM Go to last post
  22. E(X) Vaiance SD and P

    Consider the following data - x =3, P(X) is .2 x=4, P(X) is .1 x=5, P(X) is .2 x=6, P(X) is .2 x=7, P(X) is .1 x=8,P(X) is .2 Find the...

    Started by mathmoron‎, 12-14-2009 08:38 AM
    • Replies: 1
    • Views: 2,073
    12-26-2009, 01:40 PM Go to last post
  23. Few questions

    Hey guys, Im doin a subject called Statistics for Business at university, and I need some help..I will post the question and how I work it out, and...

    Started by Skyline_man‎, 12-21-2009 10:03 PM
    • Replies: 2
    • Views: 1,912
    12-21-2009, 10:24 PM Go to last post
  24. Joint Pdf

    Hi all! Someone can help me with this simple problem? The duration of a certain type of bulbs has a exponential distribution with known parameter...

    Started by Gp7417‎, 12-19-2009 08:18 PM
    • Replies: 1
    • Views: 2,456
    12-20-2009, 11:18 AM Go to last post
  25. Smile Lottery combinations?

    Someones invented a bet and put it on beluckytote.com. I'm thinking of putting 20p on it but I'm not sure what the odds for the different options...

    Started by sid‎, 12-16-2009 04:32 PM
    • Replies: 3
    • Views: 4,063
    12-17-2009, 05:18 PM Go to last post
  26. n-dimensional normal distribution

    Hi. My question is about the theory. For example we have two independent normal distributed variates. Then their joint distribution is also...

    Started by kobylkinks‎, 12-17-2009 08:12 AM
    • Replies: 3
    • Views: 6,506
    12-17-2009, 11:39 AM Go to last post
  27. I still need help please

    Ok, so I am still working on this freaking problem. Can someone help me please. It states that the scenario is normally distributed with a mean price...

    Started by BestNurse‎, 12-12-2009 08:42 PM
    • Replies: 12
    • Views: 22,997
    12-14-2009, 09:10 PM Go to last post
  28. Tricky Poisson probability

    Hi: I have a Poisson probability I am having a rough time wrapping my head around. "The number of planes flying overhead averages 40 per hour....

    Started by galactus‎, 12-12-2009 06:14 PM
    • Replies: 1
    • Views: 2,394
    12-13-2009, 06:09 AM Go to last post
  29. Poisson process: compute E[N(3) |N(2),N(1)]

    note: N(t) is the number of points in and N(t1,t2] is the number of points in (t1,t2]. Let {N(t): t≥0} be a Poisson process of rate 1. Evaluate...

    Started by kingwinner‎, 12-11-2009 08:04 AM
    • Replies: 7
    • Views: 3,696
    12-13-2009, 01:32 AM Go to last post
  30. Need help with a question please!

    Hey everyone. I am having difficulty with one of my questions and would appreciate any help. It deals with normal distribution. The mean price is $36...

    Started by BestNurse‎, 12-12-2009 10:57 AM
    • Replies: 2
    • Views: 2,171
    12-12-2009, 11:19 AM Go to last post
  31. Need help with Review for final

    Hi, so i have been having a lot of trouble placing the null and alternative hypotheses. I had thought that i was doing it right, but the mark always...

    Started by marcelgluch‎, 12-11-2009 11:59 PM
    • Replies: 1
    • Views: 2,970
    12-12-2009, 01:17 AM Go to last post
  32. Specific set number generator

    Hi, I`m totally newbie in statistic and i would like to ask for help. I need to write a program for generating a list of numbers from a specific...

    Started by eyej‎, 12-11-2009 10:48 PM
    • Replies: 1
    • Views: 5,795
    12-11-2009, 11:19 PM Go to last post
  33. Probability using z-table

    I'm studying for a final and working on some practice problems. I'm stumped on this one and would appreciate any and all help you can provide. The...

    Started by robbiesqp‎, 12-11-2009 05:20 PM
    • Replies: 4
    • Views: 6,096
    12-11-2009, 07:42 PM Go to last post
  34. probability help, related to moment generating function

    X and Y are two independent random variables having mgfs Mx(t)=exp{et-1}and MY(t)=et/(2-et). et=>exp{t} How to find a closed expression for P...

    Started by ruyifeng‎, 12-07-2009 04:50 PM
    • Replies: 1
    • Views: 2,565
    12-11-2009, 03:28 PM Go to last post
  35. Kernel density estimation for non-I.I.D. data

    Hi - This is my first post here, so let me know if I'm out of order in any way. I am wondering if Kernel Density Estimation (KDE) is appropriate...

    Started by belliott4488‎, 12-11-2009 01:34 PM
    • Replies: 0
    • Views: 3,253
    12-11-2009, 01:34 PM Go to last post
  36. Probablitiy question

    I have a feeling this is tougher than it sounds... Two individuals receive an envelope filled with dollar bills. The number of dollars is greater...

    Started by william142‎, 12-10-2009 10:45 PM
    • Replies: 2
    • Views: 2,465
    12-11-2009, 01:30 AM Go to last post
  37. Calculating a new probability based on a scenario

    I have a number of assets, that I own a portion of, attached. Each asset has an individual annual probability of loss. However, the whole group is...

    Started by prr‎, 12-10-2009 07:35 AM
    • Replies: 0
    • Views: 2,436
    12-10-2009, 07:35 AM Go to last post
  38. Poisson!PLEASE HELP!

    I am preparing for my test which is on Friday. There is this problem which is killing me and I don't have any idea how to solve it! It is in...

    Started by olivera787878‎, 12-09-2009 09:35 PM
    • Replies: 0
    • Views: 2,509
    12-09-2009, 09:35 PM Go to last post
  39. Poisson process on R^2

    Consider a Poisson process of rate λ on R^2. Let N(r) be the number of points in a circle of radius r centered at the origin and Y2 be the distance...

    Started by kingwinner‎, 12-09-2009 09:07 PM
    • Replies: 0
    • Views: 3,215
    12-09-2009, 09:07 PM Go to last post
  40. Probability question on finding condtional density

    Find f(x|y) of f(x,y)=24y(1-x-y) if x>0, y>0, x+y<1? My understanding is that fy(y) is the integral from 1-y to 0 for function f(x,y)with respect...

    Started by rohitbothra‎, 12-08-2009 12:54 PM
    • Replies: 0
    • Views: 2,192
    12-08-2009, 12:54 PM Go to last post
  41. Probability Please Help

    I cannot figure out this problem for the life of me. Can someone please help me. I have the answer. .58. However, I cannot figure out the solution. I...

    Started by hyperlite‎, 12-05-2009 12:16 AM
    • Replies: 2
    • Views: 5,525
    12-05-2009, 02:05 AM Go to last post
  42. Estimating proportion

    A processor of carrots cuts the green top off each carrot, washes the carrots, and inserts six into a package. Twenty packages are inserted in a box...

    Started by bbrown79‎, 12-02-2009 09:43 PM
    • Replies: 0
    • Views: 4,361
    12-02-2009, 09:43 PM Go to last post
  43. Problem with MLE with Bernoulli and Gamma distribution

    Hi, Can any body help with the following problem: a medical practitioner is interested in measuring the success of a drug on n = 100 patients....

    Started by marsuconn‎, 12-02-2009 08:16 PM
    • Replies: 0
    • Views: 3,088
    12-02-2009, 08:16 PM Go to last post
  44. Binomial Question

    Current medical studies indicate that 30% of the population will suffer from the flu each winter. A group of 12 people is randomly selected. a....

    Started by bbrown79‎, 12-02-2009 05:50 PM
    • Replies: 3
    • Views: 2,418
    12-02-2009, 08:08 PM Go to last post
  45. simple probability question

    Hey guys, great forum! I've got a problem: I own 3 tools, which have average time of life 4, 6 and 8 days (exponential distribution). How can I...

    Started by giankar‎, 12-01-2009 04:17 PM
    • Replies: 2
    • Views: 2,641
    12-01-2009, 06:19 PM Go to last post
  46. Need Help With Joint Density Problem Please!

    I got the problem

    Started by Porter1‎, 11-25-2009 09:15 PM
    • Replies: 5
    • Views: 4,304
    11-26-2009, 10:35 AM Go to last post
  47. Almost sure convergence & convergence in probability

    "Almost sure convergence" always implies "convergence in probability", but the converse is NOT true. Thus, there exists a sequence of random...

    Started by kingwinner‎, 11-23-2009 08:37 PM
    • Replies: 6
    • Views: 9,678
    11-26-2009, 10:23 AM Go to last post
  48. Convergence of random variables

    I was reading some proofs about the convergence of random variables, and here are the little bits that I couldn't figure out... 1) Let X_n be a...

    Started by kingwinner‎, 11-24-2009 12:56 PM
    • Replies: 2
    • Views: 2,660
    11-26-2009, 09:19 AM Go to last post
  49. I have another question please!!

    I need help with how I figure out the solution to a question I am working on. I seem to be having a difficult time with probability and it does not...

    Started by BestNurse‎, 11-25-2009 09:32 PM
    • Replies: 1
    • Views: 2,019
    11-25-2009, 11:40 PM Go to last post
  50. Need Help please!!

    I seem to be really stuck on the whole probability concept. I am trying to work through my assignment but it seems like I keep getting stuck. Can...

    Started by BestNurse‎, 11-25-2009 12:09 PM
    • Replies: 3
    • Views: 2,192
    11-25-2009, 10:47 PM Go to last post
  51. Confusing Problem and Need Help!

    ...........................

    Started by Porter1‎, 11-25-2009 09:27 PM
    • Replies: 0
    • Views: 2,570
    11-25-2009, 09:27 PM Go to last post
  52. Tough and Really Need Your Help!

    ....................

    Started by Porter1‎, 11-24-2009 01:58 AM
    • Replies: 1
    • Views: 1,926
    11-24-2009, 04:45 AM Go to last post
  53. Poisson and Binomial Random Variable question

    no help needed

    Started by Porter1‎, 11-23-2009 02:08 AM
    • Replies: 2
    • Views: 3,461
    11-24-2009, 01:17 AM Go to last post
  54. Need Help With This Question!

    No help needed

    Started by Porter1‎, 11-23-2009 02:28 AM
    • Replies: 2
    • Views: 2,315
    11-24-2009, 12:48 AM Go to last post
  55. Question Maxent of Joint from Conditionals

    I have a problem where I have three random variables, x, y and z, that each take on nonnegative real values. I know the three conditionals p(x,y|z),...

    Started by simianly‎, 11-23-2009 08:12 PM
    • Replies: 0
    • Views: 1,861
    11-23-2009, 08:12 PM Go to last post
  56. Question random selection probability problem

    Hi all, I have about 150 factors, of which 25 turns out be present in particular dataset. I want to prove that probability of finding 25 out of 150...

    Started by jacks45‎, 11-23-2009 09:54 AM
    • Replies: 0
    • Views: 2,276
    11-23-2009, 09:54 AM Go to last post
  57. Joint Density Help

    What is joint density?

    Started by Porter1‎, 11-23-2009 02:22 AM
    • Replies: 0
    • Views: 2,426
    11-23-2009, 02:22 AM Go to last post
  58. Need Help On This One

    ................

    Started by Porter1‎, 11-23-2009 02:15 AM
    • Replies: 0
    • Views: 1,652
    11-23-2009, 02:15 AM Go to last post
  59. Unhappy significance/confidence interval help?

    A 90% confidence interval for μ is (0.65, 0.70). Performing a two-sided test, you would _____ H0: μ = 0.69 at the 10% significance level. ...

    Started by dumbcollegestudent‎, 11-22-2009 09:39 PM
    • Replies: 1
    • Views: 2,578
    11-22-2009, 10:06 PM Go to last post
  60. P-Value help

    If John and Joel are both salesmen and their p-values are .9972 and .9332 respectively, would John be considered a better salesman? It appears to me...

    Started by theevilp0ptart‎, 11-22-2009 07:58 PM
    • Replies: 0
    • Views: 1,944
    11-22-2009, 07:58 PM Go to last post

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