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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: 31,138
    09-30-2005, 09:44 AM Go to last post
  1. Continuity correction, poisson

    Hi There is something that puzzles me. I tried calculating a Poisson probability. Exactly, and with the normal distribution, using both the...

    Started by Tarly‎, 03-09-2014 10:08 AM
    • Replies: 3
    • Views: 2,994
    03-09-2014, 11:27 AM Go to last post
  2. Mmsee

    If I am given a random vector X with mean ' and a covariance matrix C= how do I find the MMSEE of x1 given x2 = 0 x3 = 0 x4 = 0

    Started by stephanie‎, 03-07-2014 06:32 PM
    math stats, variance
    • Replies: 4
    • Views: 2,868
    03-08-2014, 01:51 AM Go to last post
  3. Binomial formula - solve for N help ...

    Hi, I'm not a student and this is not for a test. I'm a programmer and this is related to the markets. This is a link for the common formula:...

    Started by brooksr‎, 03-07-2014 11:45 PM
    basic probability, binomial
    • Replies: 1
    • Views: 1,452
    03-08-2014, 01:42 AM Go to last post
  4. Post Poisson Distribution

    On average, every six minutes a car passes by a sector in which it plans to build a tunnel. The passage of many vehicles indicate risk of congestion...

    Started by luis0426‎, 03-05-2014 08:42 PM
    • Replies: 1
    • Views: 2,486
    03-06-2014, 10:50 PM Go to last post
  5. Homework Help! Axioms of Probability

    Hi, so I've been stuck on three problems after multiple submissions and still cannot get it right! Can someone help and mind explaining? The bolded...

    Started by _xoxochip_‎, 03-05-2014 08:05 PM
    • Replies: 0
    • Views: 3,469
    03-05-2014, 08:05 PM Go to last post
  6. Post Need help with this problem

    On average, every six minutes a car passes by a sector in which it plans to build a tunnel. The passage of many vehicles indicate risk of congestion...

    Started by luis0426‎, 03-05-2014 04:53 PM
    • Replies: 2
    • Views: 2,828
    03-05-2014, 07:24 PM Go to last post
  7. Apparent contradiction with the definition of probability

    Hi everyone, here is my doubt: according to the definition of probability the probability that in a coin tossing the result be heads is 0.5 because...

    Started by ivhenao‎, 03-05-2014 05:39 PM
    • Replies: 1
    • Views: 1,755
    03-05-2014, 05:58 PM Go to last post
  8. Question calculating expected cell frequency multivariate normal distribution

    How would I go about calculating the expected cell frequency of a discrete distribution (say, multivariate normal)? The 1-D analog would be the...

    Started by studentofstudent‎, 03-04-2014 08:52 PM
    • Replies: 3
    • Views: 1,079
    03-05-2014, 07:48 AM Go to last post
  9. Cool Care to place a bet? (probability guru needed)

    I consider myself pretty good when it comes to math and probabilities, but this has me stumped. It's your lucky day! A man offers you a fair coin...

    Started by meridian‎, 03-04-2014 01:24 PM
    • Replies: 1
    • Views: 2,293
    03-04-2014, 10:14 PM Go to last post
  10. Probablity

    The probability that in a fair a person will hit the balloon is 0.25. What is the probability that a person will hit 2 balloons using binomial...

    Started by siddharthvithlani‎, 03-03-2014 11:40 PM
    probability
    • Replies: 1
    • Views: 1,432
    03-03-2014, 11:42 PM Go to last post
  11. Multivariate normal distribution, not full rank, probability density function

    If X has a multivariate distribution of full rank and Y is the sum of the elements of X. Then (X,Y) is a multivariate normal distribution but not...

    Started by JJstar‎, 03-03-2014 11:08 AM
    density function, multivariate normal
    • Replies: 1
    • Views: 1,769
    03-03-2014, 12:06 PM Go to last post
  12. Probability question

    I need a probability question answering as soon as possible and i though this might be the place to come. There are 13 balls in a hat being...

    Started by ab1234‎, 03-02-2014 07:33 PM
    hypergeometric, urn
    • Replies: 5
    • Views: 2,041
    03-02-2014, 11:36 PM Go to last post
  13. Deriving the sampling (or asymptotic) distribution

    Assume we have the following function: f(p) = \frac{1}{(1-p)d}\ln\left(\frac{1}{T}\sum_{t=1}^{T}\left^{1-p} \right) where d is a constant ...

    Started by TrueTears‎, 02-19-2014 01:41 AM
    • Replies: 3
    • Views: 3,000
    03-02-2014, 01:18 AM Go to last post
  14. Events following Poisson Distribution including a fixed dead time

    Hi, Im trying to describe some events with the Poisson distribution and overall its a really good fit. There is however a slight error in the...

    Started by honestlyno‎, 03-01-2014 09:40 AM
    person-time, poisson
    • Replies: 1
    • Views: 2,194
    03-01-2014, 10:08 PM Go to last post
  15. Multiple Criteria, non-binary outcomes

    So, I'm trying to predict outcomes using baseball data. What I want to do is predict the outcome of batted balls based on the following criteria: ...

    Started by agutts6‎, 02-26-2014 12:51 PM
    baseball, conditional probability
    • Replies: 2
    • Views: 1,186
    02-28-2014, 11:47 AM Go to last post
  16. Poker Club Probability of Winning Question

    I need some help. I'm looking for how to calculate the odds\probability of a person winning in a poker club based on events that have already...

    Started by scalfdn‎, 02-20-2014 01:06 AM
    • Replies: 2
    • Views: 1,577
    02-27-2014, 11:34 PM Go to last post
  17. Probability of coincidence ?

    Probability of coincidence ? (WARNING... resolving this problem may force upon you world fame and extreme wealth) I basically don't know where to...

    Started by RobAbility‎, 02-19-2014 05:06 PM
    3 Pages
    1 2 3
    • Replies: 40
    • Views: 13,593
    02-27-2014, 09:21 PM Go to last post
  18. Probability question - Cards

    Hello everyone! I just started to study statistics by myself because I spent a semester abroad and there are no more lectures at the University, if...

    Started by katabate‎, 02-26-2014 05:17 AM
    cards problem, probability
    • Replies: 0
    • Views: 1,511
    02-26-2014, 05:17 AM Go to last post
  19. Same flat tire

    Hello, I am unsure about how to solve this one: It's Friday afternoon and six fraternity brothers at UNC have just attended their last class of the...

    Started by dina786‎, 10-01-2012 06:08 PM
    • Replies: 7
    • Views: 4,773
    02-26-2014, 12:24 AM Go to last post
  20. Probability of selecting two different colored balls

    Given an urn with x red balls, and y green balls, thoroughly mixed, what is the probability of choosing two colors in the first two picks, when the...

    Started by Daddii‎, 02-23-2014 01:45 PM
    probability, replacement, selection
    • Replies: 12
    • Views: 3,187
    02-25-2014, 10:20 PM Go to last post
  21. probability & time series

    hi I'm a physician and really need help from somebody who is good at probability. I calculated time series of tidal stresses. It turned out that...

    Started by sthoriginal‎, 02-25-2014 11:44 AM
    • Replies: 1
    • Views: 1,749
    02-25-2014, 02:59 PM Go to last post
  22. Need help- formulating difference equation

    there is a square with 4 equal blocks. if a mosquito set to fly starting at block 1, it is equally likely to fly to other blocks 2,3,4. what is the...

    Started by saandy‎, 02-24-2014 08:00 PM
    • Replies: 0
    • Views: 1,120
    02-24-2014, 08:00 PM Go to last post
  23. Weiner Hopf method cross-correlation confusion

    u(n) = .4s(n) +.7s(n-1)-.1s(n-1) +v(n) where variance of v(n) = .003 I want to find the cross correlation matrix against the optimal delay of 6...

    Started by nikki101‎, 02-24-2014 12:07 AM
    • Replies: 0
    • Views: 1,175
    02-24-2014, 12:07 AM Go to last post
  24. New at this

    If I offer a 90% satisfaction rate. and 3 people call me what is the probabilty that they will satisfied?

    Started by kkdd‎, 02-23-2014 08:25 PM
    • Replies: 1
    • Views: 1,125
    02-23-2014, 08:56 PM Go to last post
  25. Basic correlation matrix question

    I am new to statistics. I have a signal u(n) = .4s(n)+.7s(n-1)-.1s(n-2) +v(n) where v(n) has variance .003 E yields .4^2 +.7^2 +(-.1)^2...

    Started by nikki101‎, 02-23-2014 08:35 PM
    • Replies: 1
    • Views: 1,087
    02-23-2014, 08:45 PM Go to last post
  26. Stats

    The time to failure for a TV is modeled by this equation f(t) = 0.02e -0.02t. Should I start this problem off by looking at the T table getting the...

    Started by helpless in stats‎, 02-23-2014 04:06 PM
    • Replies: 4
    • Views: 1,714
    02-23-2014, 04:32 PM Go to last post
  27. Sufficent statistics and unbiased

    If I find the (unique) sufficient statistic of a parameter and say I also found the MLE of the parameter. If the MLE of the parameter is not...

    Started by stephanie‎, 02-22-2014 05:28 PM
    • Replies: 2
    • Views: 1,399
    02-23-2014, 08:58 AM Go to last post
  28. Independence versus conditional indenpendce

    Independence versus conditional independence. Consider x and y independent Gaussian random variables with zero mean and unity variance. 1. For an...

    Started by squr‎, 02-21-2014 07:58 AM
    • Replies: 2
    • Views: 1,581
    02-22-2014, 11:59 AM Go to last post
  29. Cool Adjusting Fantasy Sports Projections Using Z-Scores

    Hi! Stats newbie here so be nice! :wave: I'm currently working on a projection model for fantasy basketball. I am trying to adjust a player's...

    Started by moonshine‎, 02-21-2014 01:28 PM
    • Replies: 2
    • Views: 3,026
    02-21-2014, 02:02 PM Go to last post
  30. Some questions

    1. Suppose you are calculating an Analysis of Variance for a completely randomized design. You are testing the hypotheses: H0: 1 = 2 = 3 = H1:...

    Started by bigbob‎, 02-18-2014 01:21 PM
    • Replies: 0
    • Views: 1,271
    02-18-2014, 01:21 PM Go to last post
  31. Poisson probability question

    1. An enemy force is known to be hiding in one of twenty possible locations. General Staff orders a search to be made by picking a site at random,...

    Started by nj2014‎, 02-12-2014 08:17 PM
    • Replies: 1
    • Views: 1,717
    02-17-2014, 07:08 PM Go to last post
  32. Probability Question

    Hello! :wave: I was hoping such a forum existed, and with the magic of Google, I found it :) I'm very interested in understanding this as much as...

    Started by Owl Salesman‎, 02-16-2014 05:09 PM
    • Replies: 4
    • Views: 1,496
    02-16-2014, 06:07 PM Go to last post
  33. Help with an algorithm

    Say I have many conditions (C1...n), and one event E. I know the basic probability of both E and C1..n occurring. I'm not too good with this stuff......

    Started by jwilliams‎, 02-14-2014 02:01 PM
    • Replies: 0
    • Views: 1,256
    02-14-2014, 02:01 PM Go to last post
  34. Probability

    this is my question Suppose 20% of the items produced by a factory are defective. Suppose 12 items are chosen at random. Find the probability that...

    Started by lakindu‎, 02-14-2014 10:24 AM
    binomial distribution, probability
    • Replies: 1
    • Views: 1,252
    02-14-2014, 12:20 PM Go to last post
  35. Binomial Distribution - Help

    Solved! Thanks for your feedback!

    Started by skittles‎, 02-12-2014 02:02 PM
    • Replies: 2
    • Views: 988
    02-14-2014, 01:10 AM Go to last post
  36. Binomial Probability (Elementary Statistics)

    Hi, I was hoping someone could explain this to me. I've tried online tutoring, and honestly it doesn't seem like they know what their doing. My...

    Started by NotaMathGuy88‎, 02-13-2014 11:10 PM
    • Replies: 0
    • Views: 1,129
    02-13-2014, 11:10 PM Go to last post
  37. Need Help with Model

    I need help with the following... I am using @Risk and am trying to set up a model. I finished an MBA level stats course, and am fairly familiar...

    Started by rsimpson71‎, 02-11-2014 07:03 PM
    • Replies: 3
    • Views: 1,637
    02-12-2014, 09:23 AM Go to last post
  38. statistic help me please "probability"

    1. Data on the 30 largest stock and balanced funds provided one-year and five year percentage returns for the period ending ending March 31, 2000...

    Started by trongboy16‎, 02-11-2014 10:59 AM
    • Replies: 0
    • Views: 2,411
    02-11-2014, 10:59 AM Go to last post
  39. Post Conditional Probability question???? Help me ,please

    1. Data on the 30 largest stock and balanced funds provided one-year and five year percentage returns for the period ending ending March 31, 2000...

    Started by trongboy16‎, 02-11-2014 07:22 AM
    • Replies: 1
    • Views: 3,119
    02-11-2014, 07:29 AM Go to last post
  40. Post Conditional Probability question???? Help me ,please

    1. Data on the 30 largest stock and balanced funds provided one-year and five year percentage returns for the period ending ending March 31, 2000...

    Started by trongboy16‎, 02-11-2014 02:21 AM
    • Replies: 0
    • Views: 1,819
    02-11-2014, 02:21 AM Go to last post
  41. Homework Question

    P(high-quality oil)= .50 P(medium-quality oil) = .20 P(no oil) = .30 a) what is the probability of finding oil? I know the answer to this, it is...

    Started by Grimreapersaint‎, 02-10-2014 12:22 AM
    • Replies: 1
    • Views: 3,018
    02-10-2014, 12:35 PM Go to last post
  42. Gambling odds probability

    2. A gambler offers you to pay even odds if you get 9, 10 or 11 heads in 20 tosses. Should you take the bet? Assume it is a fair coin. X=number of...

    Started by nj2014‎, 02-09-2014 10:30 PM
    • Replies: 1
    • Views: 1,718
    02-09-2014, 10:46 PM Go to last post
  43. Generateing a random variable

    Hi, I have a problem on how to start the following problem: Suppose that X and Y are discrete random variables with a joint probability mass...

    Started by ricolinka‎, 02-09-2014 10:36 AM
    • Replies: 1
    • Views: 1,392
    02-09-2014, 10:46 AM Go to last post
  44. Application of the unconscious statistician

    A random variable Y is normal with mean u and variance s^2. Given that g(y) =exp(2y) , using a taylor series expansion around u to approximate E and...

    Started by darkdream‎, 02-07-2014 11:09 PM
    • Replies: 1
    • Views: 1,976
    02-08-2014, 10:18 PM Go to last post
  45. Exclamation Binomial Distribution

    A company starts a fund of M dollars from which it pays $1000 to each employee who achieves high performance during the year. The probability of...

    Started by Takumi‎, 02-08-2014 02:08 AM
    binomial distriubtion, probability, statistics
    • Replies: 3
    • Views: 6,031
    02-08-2014, 02:10 PM Go to last post
  46. random vectors covariance

    If a random vector X = ^T where T is the transpose has mean u and covariance R. Find the average and covariance of Y = b1x1+b2x2+...+bnxn where bi...

    Started by stephanie‎, 02-06-2014 11:50 PM
    • Replies: 2
    • Views: 1,090
    02-07-2014, 12:54 PM Go to last post
  47. Monty Hall Probability Question- with what i have done so far

    In a game show, there are 3 doors. Behind one of the doors is a car, behind the other two are goats. A contestant chooses door number 1, but...

    Started by verygreen‎, 02-04-2014 09:39 PM
    • Replies: 1
    • Views: 1,112
    02-06-2014, 04:07 PM Go to last post
  48. (Simple) proof for the arithmetic mean?

    Hello. I am having trouble trying to figure out a way to answer this homework exercise: "Prove that the arithmetic mean cannot be greater than the...

    Started by will22‎, 02-05-2014 11:27 AM
    • Replies: 5
    • Views: 2,283
    02-05-2014, 03:48 PM Go to last post
  49. Comparison of variability of synthetic and real data

    Hello, I'm trying to compare a real dataset with a random (synthetic) distribution to determine whether a pattern I see in the data is real or the...

    Started by Dafrst‎, 02-05-2014 03:36 PM
    bootstrap, random sampling, variability
    • Replies: 0
    • Views: 1,339
    02-05-2014, 03:36 PM Go to last post
  50. Probability in Hidden Markov Model

    Hello, I'm considering a Hidden Markov Model as follows: X_{n + 1} = F_n(X_n,\Theta,\eta_n) (that's X_{n+1} here, I don't know why the + is...

    Started by PlpPlp‎, 02-05-2014 08:24 AM
    • Replies: 0
    • Views: 1,250
    02-05-2014, 08:24 AM Go to last post
  51. Probability question with percentages

    - You are given a number of transmission switches that are unreliable in the following sense: when triggered by a sudden voltage pulse, they will...

    Started by nj2014‎, 02-03-2014 04:54 PM
    • Replies: 2
    • Views: 1,736
    02-03-2014, 06:09 PM Go to last post
  52. Payoff table probabilities

    Hello guys, I have an assignment and I am royally stuck and don't have a clue how to begin. Any sort of help would be greatly appreciated (no need to...

    Started by 441631‎, 01-31-2014 09:09 PM
    • Replies: 0
    • Views: 2,581
    01-31-2014, 09:09 PM Go to last post
  53. Binomial Probability

    I am trying to figure out how many possible combinations there are for a 10 question survey that has yes or no answers. I tried writing out a sample...

    Started by Ker‎, 01-30-2014 10:30 AM
    • Replies: 1
    • Views: 1,247
    01-30-2014, 10:46 AM Go to last post
  54. Question about the basic limit theorem of Markov-chains.

    Hi, I have two questions about the theorem. 1. If a Markov-chain is irreducible, aperiodic and and positive recurrent we can use the theorem to...

    Started by Tarly‎, 01-26-2014 09:39 PM
    • Replies: 0
    • Views: 2,354
    01-26-2014, 09:39 PM Go to last post
  55. Closed form formula for the non central moments of normal distribution?

    What is the formula for the nth non-central moments of the normal distribution.

    Started by stephanie‎, 01-25-2014 08:05 PM
    • Replies: 1
    • Views: 4,462
    01-25-2014, 08:50 PM Go to last post
  56. Probability for Denver and Seattle reaching the Super Bowl

    There are 16 teams in the American Football Conference, the Denver, Colorado Broncos being one. There are 16 teams in the National Football...

    Started by Georgeo57‎, 01-20-2014 06:39 AM
    2014 super bowl, denver broncos, marijuana, seattle seahawks
    • Replies: 3
    • Views: 3,137
    01-25-2014, 05:03 AM Go to last post
  57. Pdf of peak-to-peak value given n trials from a normal distribution

    Im trying to find the pdf for the peak-to-peak value of n events from a normal distribution. I was hoping to use this to help me compare some...

    Started by mcantre‎, 01-23-2014 02:07 PM
    • Replies: 4
    • Views: 3,717
    01-24-2014, 11:55 AM Go to last post
  58. proof on expected value inequality

    Suppose f(x) symmetric. Prove E^2 <= variance(x) = E-E^2. Attempt: E^2 +E^2 <= E^2 +E^2 = 2E^2 (?) <= E I do not know how to show...

    Started by stephanie‎, 01-23-2014 01:58 PM
    • Replies: 1
    • Views: 2,257
    01-24-2014, 04:55 AM Go to last post
  59. Red face Filter combinations

    1.In football matches,3 teams are played,one is home team and another one is away team,draw team matches is one of them,each team have 15 matches,the...

    Started by saran‎, 01-23-2014 07:52 AM
    • Replies: 0
    • Views: 1,370
    01-23-2014, 07:52 AM Go to last post
  60. Probability GIVEN I already know some event has occurred

    I ask 14 people to buy something, 2 say yes, 12 say no. Given this happened, what is the probability that the next person I ask will buy...

    Started by jnscollier‎, 01-21-2014 09:44 PM
    conditional probability
    • Replies: 8
    • Views: 1,966
    01-23-2014, 02:23 AM Go to last post

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