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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: 30,345
    09-30-2005, 09:44 AM Go to last post
  1. Exclamation Almost sure convergence

    Let Y_n be a simple symmetric random walk on the integers Z, starting in state 0. Define X_n to be 1 if Y_n=0 and 0 otherwise. I have already...

    Started by Amelia‎, 11-22-2009 10:31 AM
    • Replies: 1
    • Views: 4,306
    11-22-2009, 11:05 AM Go to last post
  2. Var(X) where X = 0 80% of the time and X ~ Uniform(1,b) 20% of the time

    Suppose X: S --> is a continuous random var defined on sample space S with pdf = Pr(X = 0) = 0.8 Pr(X) = (1-p(0))/(b - a) = 0.2/10 for all X...

    Started by ltdanp21‎, 11-18-2009 09:53 AM
    • Replies: 1
    • Views: 3,031
    11-22-2009, 08:03 AM Go to last post
  3. Normal approximation and also a problem with hypothesis testing

    I need a little help with the formulas here. Im not sure if I am doing this right. Records show that 29% of all payments to a mail-order company...

    Started by theevilp0ptart‎, 11-21-2009 09:47 PM
    • Replies: 0
    • Views: 5,770
    11-21-2009, 09:47 PM Go to last post
  4. law of total expectation (VECTOR case)

    " The law of total expectation is: E(Y) = E. It can be generalized to the vector case: E(Y) = E. Further extension: (i) E(Y|X1) = E (ii)...

    Started by kingwinner‎, 11-18-2009 02:53 AM
    • Replies: 4
    • Views: 5,612
    11-21-2009, 12:35 PM Go to last post
  5. expected value and variance derivation (kernel)

    Hi there, I am studying kernel smoothing from the book of Mand. I will appreciate any help because I am stuck all day. (p15) I am stuck at the...

    Started by leo nidas‎, 11-20-2009 04:59 PM
    • Replies: 0
    • Views: 4,254
    11-20-2009, 04:59 PM Go to last post
  6. find the expected value of continuous random vaiable

    Hi, To find the expected value of a continous random variable I normally integrate the pdf multiplied by the random variable over the range of the...

    Started by PeterVincent‎, 11-17-2009 04:13 PM
    • Replies: 10
    • Views: 14,177
    11-20-2009, 07:05 AM Go to last post
  7. Should I be using Conditional probability here?

    Hi, Last Friday - which was the 13th - I gave myself this problem: Find the probabilty of a day being FRIDAY the 13th I used the following...

    Started by RajeshS‎, 11-19-2009 10:58 AM
    • Replies: 0
    • Views: 2,166
    11-19-2009, 10:58 AM Go to last post
  8. Thumbs up Probability Questions help please

    The finishing process on new furniture leaves slight blemishes. The table shown below displays a manager’s probability assessment of the number of...

    Started by sgk1979‎, 11-18-2009 05:05 PM
    • Replies: 2
    • Views: 5,634
    11-18-2009, 09:37 PM Go to last post
  9. Law of Total Expectation

    The law of total expectation states that: E(X) = E and E = Eg(X)|Y)] 1) Now, is it correct to say that E(XY)=EXY|Y)] ? I don't think the above...

    Started by kingwinner‎, 11-16-2009 02:09 AM
    • Replies: 10
    • Views: 12,806
    11-18-2009, 02:28 AM Go to last post
  10. Conditioning on Random Variables?

    Let T be a constant, and let N be a random variable. Suppose {X_1,X_2,...} are independent, and each X_i follows continuous uniform(0,T)...

    Started by kingwinner‎, 11-15-2009 10:38 PM
    • Replies: 5
    • Views: 3,361
    11-17-2009, 10:50 PM Go to last post
  11. Please help with Binomial Distribution probabilities

    a fair six sided die is rolled 5 times and the number of 6's are counted. find n and p. Find the probability of exactly two 6's. I know that n=5...

    Started by coolbeans‎, 11-17-2009 04:36 PM
    • Replies: 2
    • Views: 3,617
    11-17-2009, 09:49 PM Go to last post
  12. statistics problem dealing with minimum occurrences

    Don cherry says on average of 4 outrageous things per week. Don mclean claims that cherry rarely says fewer than 16 outrageous things per week. If...

    Started by matt1101‎, 11-17-2009 02:07 AM
    • Replies: 0
    • Views: 1,803
    11-17-2009, 02:07 AM Go to last post
  13. probability problem help!

    X and Y are independent with a common distribution... f(x) = 1 if 0 less than or equal to x less than or equal to 1 f(x) = 0 elsewhere a....

    Started by fromku‎, 11-16-2009 06:17 PM
    • Replies: 1
    • Views: 2,048
    11-16-2009, 10:33 PM Go to last post
  14. loss probabilities

    trying to figure out this problem: insurance company estimates of loss probabilities for the next year. $500 deductible. Total loss: 0.001 50%...

    Started by jnage‎, 11-15-2009 10:56 PM
    • Replies: 1
    • Views: 2,571
    11-15-2009, 11:21 PM Go to last post
  15. Exponential Distribution

    I am having trouble with this question. In my notes from class and the texbook i can only find examples/equations for if P(x>k) or P(x<k). Would I...

    Started by Rus111‎, 11-15-2009 06:16 PM
    • Replies: 1
    • Views: 6,258
    11-15-2009, 10:27 PM Go to last post
  16. Deconvolution of gamma distribution

    Notation: g(x,a,b) is the gamma distribution with shape a and scale b. The distribution g(x,1,1) is the standard exponential distribution. ...

    Started by trsny‎, 11-15-2009 09:58 AM
    • Replies: 0
    • Views: 3,652
    11-15-2009, 09:58 AM Go to last post
  17. Help with conditional probabilty

    I've been struggling for a good couple hours on the below, and I was hoping someone might be able to push me in the right direction... "A"...

    Started by BlueScreenOD‎, 09-14-2009 06:54 PM
    • Replies: 2
    • Views: 2,687
    11-14-2009, 03:55 PM Go to last post
  18. Probablity Challenge

    can anyone solve this??? Assume 2 gamblers, Max and John, bet $1 on successive tosses of a fair coin, and each has $6 to start with. a) what is...

    Started by shangian_ng‎, 11-13-2009 12:58 PM
    • Replies: 3
    • Views: 4,431
    11-13-2009, 04:13 PM Go to last post
  19. Basketball Question

    Assuming defense has no effect... Team A shoots 100 2pt shots a game, and each shot has a 50% chance of going in. Team B shoots 100 3pt shots a...

    Started by YaoPau‎, 11-13-2009 12:53 PM
    • Replies: 1
    • Views: 2,219
    11-13-2009, 02:09 PM Go to last post
  20. Probability Distributions

    Hi all, I've got a question here, and i'm not sure if it's how it's written or what, but I'm not quite getting it. Consider an insurance policy...

    Started by c5load‎, 11-12-2009 12:33 PM
    • Replies: 1
    • Views: 4,576
    11-12-2009, 08:11 PM Go to last post
  21. Moved:Histogram Question

    This is a follow up to my other post here. I have decided to put the data into a histogram for myself. I weighted the days of the week with how...

    Started by gatorpower‎, 11-11-2009 02:49 PM
    • Replies: 1
    • Views: 2,550
    11-12-2009, 04:39 PM Go to last post
  22. problem about almost sure and L1 convergence

    Can anyone give me some advice about this problem? Thanks. http://www.physicsforums.com/printthread.php?t=353805

    Started by yavanna‎, 11-11-2009 02:41 PM
    • Replies: 0
    • Views: 2,690
    11-11-2009, 02:41 PM Go to last post
  23. Post Question Normal Distribution

    Question: A person mustswcore in the upper 2% of the population on an IQ test to qualify for membership in Mensa. If IQ scores are normally...

    Started by kubotahandyman‎, 11-11-2009 11:51 AM
    • Replies: 1
    • Views: 2,681
    11-11-2009, 01:13 PM Go to last post
  24. Post Probability Question

    Once again can someone please help me start and point me in the right direction to help solve this problem. A university found that 20% of its...

    Started by kubotahandyman‎, 11-11-2009 11:55 AM
    • Replies: 1
    • Views: 3,420
    11-11-2009, 12:59 PM Go to last post
  25. Post Please Help with This question

    A machine fills containers with a particular product. The standard deviation of fillign weights is known from past data to be .6 once. if only 2% of...

    Started by kubotahandyman‎, 11-11-2009 09:43 AM
    • Replies: 1
    • Views: 5,713
    11-11-2009, 11:27 AM Go to last post
  26. stupid probability question

    Hi there, Here is a stupid question, am I doing something wrong, the result just don't seem right to me. Let X,Y continuous random variables...

    Started by leo nidas‎, 11-09-2009 01:52 PM
    • Replies: 1
    • Views: 3,426
    11-10-2009, 03:25 AM Go to last post
  27. Exclamation Simple birth-death process

    Hello, I am working on a simple birth-death process problem, I have been asked to find the distribution function for the extinction time T. So T...

    Started by Amelia‎, 11-08-2009 05:27 AM
    • Replies: 0
    • Views: 4,199
    11-08-2009, 05:27 AM Go to last post
  28. Question Fitting distribution to dependent bivariate dataset

    Hello, We have a dataset that consists of two variables, X and Y (see attached Excel file) that have some dependence. For a given X we can...

    Started by a9192shark‎, 11-05-2009 08:32 AM
    • Replies: 0
    • Views: 2,819
    11-05-2009, 08:32 AM Go to last post
  29. Probability WTF??

    I am really having trouble with this problem. I need to know what the probability is if a number lies between two numbers. Using the Z-score table. ...

    Started by deflp4‎, 11-04-2009 08:06 PM
    • Replies: 2
    • Views: 3,080
    11-04-2009, 08:18 PM Go to last post
  30. Probability

    Approximately 23% of Canadians aged 25-64 have a university degree (and many more have some other form of post-secondary education, such as a college...

    Started by Missblackrose‎, 11-04-2009 05:30 PM
    • Replies: 3
    • Views: 2,511
    11-04-2009, 07:03 PM Go to last post
  31. Question Confidence Intervals

    A survey of 64 random sports viewers revealed that 32 of them watched the football game. Construct a 99% confidence interval estimate for the true...

    Started by lvgirle‎, 11-02-2009 01:13 PM
    • Replies: 1
    • Views: 2,698
    11-02-2009, 08:19 PM Go to last post
  32. Identify values for Binom Dist prob

    This is my problem; A city law enforcement official has stated that 20% of the items sold by pawn shops within the city have been stolen. Ralph has...

    Started by Jadelady50‎, 11-02-2009 05:01 PM
    • Replies: 1
    • Views: 2,346
    11-02-2009, 05:40 PM Go to last post
  33. problem with a Combination rule word problem

    I am having a little trouble finding the answer to this word problem If you drew three cards form a standard deck without replacement, what would...

    Started by David_langstaff‎, 11-02-2009 01:22 PM
    • Replies: 1
    • Views: 6,712
    11-02-2009, 02:13 PM Go to last post
  34. Probability Question Involving a Cumulative Total

    Hello, I am working on a probability formula for Open Office Calc that needs to determine the following, given: Events: A.) eight 30&#37; chance of...

    Started by Milgar‎, 11-01-2009 07:13 PM
    • Replies: 0
    • Views: 3,355
    11-01-2009, 07:13 PM Go to last post
  35. Question conditional probability problem

    Here's the question: The voters in a large city are 50% white, 40% black, and 10% Hispanic. Candidate Smith wins 40% of the white vote, 80% of...

    Started by dumbcollegestudent‎, 11-01-2009 01:04 PM
    • Replies: 2
    • Views: 4,532
    11-01-2009, 05:32 PM Go to last post
  36. Arrow Kurtosis and Skewness Risk

    Hi I was wondering if anyone knew how to adjust for non-zero skewness and kurtosis so that the standard deviation measure becomes an adequate...

    Started by qwe789123‎, 10-31-2009 08:31 PM
    • Replies: 0
    • Views: 4,848
    10-31-2009, 08:31 PM Go to last post
  37. Is it binomial probability?

    Affirmative action commitments by industrial organizations have led to an increase in the number of women in executive positions. Satellite Office...

    Started by dannygina‎, 10-30-2009 08:11 AM
    • Replies: 1
    • Views: 11,786
    10-30-2009, 08:36 PM Go to last post
  38. About the definition of probability

    We know the measurable space of probability is a continuous space of . Then, if a random measure is valued (or defined) on the continuous space , is...

    Started by LigongKarlChen‎, 09-18-2009 09:26 AM
    • Replies: 2
    • Views: 2,852
    10-29-2009, 03:41 PM Go to last post
  39. confused by normal distributions with variance smaller than 1

    Hello, I am currently working with some normal distributions, and got confused by some specific situation where the density function does not look...

    Started by nightlordtw‎, 10-27-2009 10:56 AM
    • Replies: 5
    • Views: 6,727
    10-29-2009, 05:30 AM Go to last post
  40. Is a subset of a normal distribution normal?

    An easy one for some of you guys here I suspect. Thanks to anyone who can help me with it. I have an application which adds a normally...

    Started by bordonbert‎, 10-27-2009 10:39 AM
    • Replies: 4
    • Views: 10,349
    10-29-2009, 03:54 AM Go to last post
  41. joint pdf question

    I'm not quite sure if I'm approaching this question right... If the joint probability density of X and Y is given by f(x, y) = 24y(1 - x - y)...

    Started by statgirl11‎, 10-28-2009 05:18 PM
    • Replies: 1
    • Views: 6,596
    10-28-2009, 09:30 PM Go to last post
  42. please help me

    fx(x) = k(1-x^2) on (-1,1) find k, and P(lXl>1/2)

    Started by manalive04‎, 10-28-2009 07:58 AM
    • Replies: 1
    • Views: 2,774
    10-28-2009, 07:59 PM Go to last post
  43. This probability problem is all over the internet...

    This seems to be a common statistics homework question, as it is all over the internet. Because of this, I know the answer (0.2904), but that is not...

    Started by Haikuseasmoke‎, 10-28-2009 01:33 PM
    • Replies: 3
    • Views: 17,280
    10-28-2009, 05:02 PM Go to last post
  44. exponential distribution probability help

    This is a modified version of one of my homework questions. Please help me out, and show your work so I know how to calculate it myself. The only...

    Started by danthegolfer‎, 10-25-2009 06:45 PM
    • Replies: 3
    • Views: 5,192
    10-26-2009, 11:21 PM Go to last post
  45. Somebody help me please :(

    I am unsure how to do this problem. Can somebody please help me. I was shown on my TI-83 how to do problems similar, (binobpdf) so I don't know if I...

    Started by kr_wynn‎, 10-26-2009 11:28 AM
    • Replies: 1
    • Views: 6,942
    10-26-2009, 11:39 AM Go to last post
  46. Poisson Counting Process

    Started by kingwinner‎, 10-13-2009 04:26 AM
    • Replies: 1
    • Views: 3,051
    10-25-2009, 08:24 PM Go to last post
  47. Joint Density Function Help!

    For some reason I lost all of my mathematical abilities on this one.

    Started by Porter1‎, 10-21-2009 12:12 AM
    • Replies: 1
    • Views: 3,771
    10-25-2009, 08:09 PM Go to last post
  48. Pollutants in auto exhausts.

    Hello all - I am in need of some assistance with a probability problem. I am thoroughly confused and I don't know what to do. Any help is...

    Started by crosby87‎, 10-24-2009 03:01 PM
    • Replies: 2
    • Views: 16,534
    10-25-2009, 11:26 AM Go to last post
  49. Normal approximation to the Binomial probability

    Having a hard time figuring this out... can someone help me? Suppose that there is a 1 in 10000 (0.0001) chance that a randomly chosen star is...

    Started by mr_milano‎, 10-22-2009 12:14 AM
    • Replies: 1
    • Views: 4,355
    10-23-2009, 01:26 PM Go to last post
  50. Discrete distribution

    need help! You are interested in investing in sub-prime mortgages. Suppose that there is a 25&#37; chance that a subprime mortgage defaults. If the...

    Started by mr_milano‎, 10-22-2009 12:15 AM
    • Replies: 1
    • Views: 2,505
    10-23-2009, 01:15 PM Go to last post
  51. Magician

    A magician has cards 1-10 and a person picks two numbers. What is the probability that Sebastian will correctly name the 2 cards, if he is just...

    Started by boardinfanatic89‎, 10-22-2009 08:21 PM
    • Replies: 1
    • Views: 1,756
    10-23-2009, 10:31 AM Go to last post
  52. 3 Norm Dists (correlated), prob co-occurence of 1% right tail

    Hi, hoping someone can lead me in the right direction.. I'm looking at three normal distributions, specifically looking at the 1% extreme in each...

    Started by CStats‎, 10-20-2009 10:33 PM
    • Replies: 2
    • Views: 2,303
    10-21-2009, 05:15 PM Go to last post
  53. Cant figure out this question

    What are moments?

    Started by Porter1‎, 10-20-2009 11:39 PM
    • Replies: 0
    • Views: 2,310
    10-20-2009, 11:39 PM Go to last post
  54. Need Help on Gamma Probability Distribution Question

    What is moments if you are solving for m(0)?

    Started by Porter1‎, 10-20-2009 11:27 PM
    • Replies: 0
    • Views: 3,215
    10-20-2009, 11:27 PM Go to last post
  55. Can't figure out probability question...

    Ok, so I'm completely lost in my Statistics class and I really need help on this problem. I think if I figure this one out, it will help with the...

    Started by statshelp31‎, 10-19-2009 09:00 PM
    • Replies: 1
    • Views: 14,208
    10-20-2009, 10:52 AM Go to last post
  56. Probability! HELP!

    for the fiscal year 2007, a tax authority audited 1.53% of individual tax returns with income of 100,000 or more. What is the probability that two...

    Started by mgonyer‎, 10-19-2009 12:21 PM
    • Replies: 1
    • Views: 2,582
    10-20-2009, 10:47 AM Go to last post
  57. Tough Markov process question

    Hello, Im am having trouble with Markov processes and Kolmogorov equations and was hoping someone could walk me through the following question. A...

    Started by woody198403‎, 10-18-2009 11:46 AM
    • Replies: 1
    • Views: 2,265
    10-19-2009, 05:56 AM Go to last post
  58. Poisson counting process problem (not easy)

    Started by kingwinner‎, 10-13-2009 05:18 AM
    • Replies: 7
    • Views: 3,657
    10-18-2009, 10:32 PM Go to last post
  59. basic probability questions (pictures inside) Help!

    i wish i could say i knew somewhat of where to start for these problems but i dont. My teacher is not the best and the homeworks are always...

    Started by yopy‎, 10-13-2009 09:26 PM
    • Replies: 1
    • Views: 3,859
    10-16-2009, 12:07 PM Go to last post
  60. Quick Question

    Hello to all, I was directed here by my older brother for help with some questions because he's currently away at school (or just sleeping). So...

    Started by jamesmartinn‎, 10-16-2009 01:28 AM
    • Replies: 2
    • Views: 3,704
    10-16-2009, 08:58 AM Go to last post

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