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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: 30,309
    09-30-2005, 09:44 AM Go to last post
  1. Help with probability, please! I've already done some work, just need some extra help

    I need to calculate the probability of at LEAST five shoppers entering the mall between 11 and 11:05, with them entering at an average of 120/hr I...

    Started by KristenG614‎, 03-25-2009 10:03 PM
    • Replies: 0
    • Views: 1,898
    03-25-2009, 10:03 PM Go to last post
  2. Type of Distribution, Central Limit Theorem?

    Question: a roulette wheel has 38 slots, numbered 0, 00, and 1 through 36. if you bet 1 on a specified number you either win 35 or lose 1 if it...

    Started by jjs2168‎, 03-25-2009 09:33 PM
    • Replies: 0
    • Views: 2,349
    03-25-2009, 09:33 PM Go to last post
  3. probability question

    i decided to erase my question. I found it posted elsewhere on this forum. Thank you!!

    Started by sheuer82‎, 03-25-2009 04:56 PM
    • Replies: 0
    • Views: 1,965
    03-25-2009, 04:56 PM Go to last post
  4. normal distribution ...help?

    Can Someone please help me solve this?:confused: The credit score of a 35 year old applying for a mortgage at Ulysses Mortgage Associates is...

    Started by staffordsc‎, 03-25-2009 02:11 PM
    • Replies: 0
    • Views: 2,241
    03-25-2009, 02:11 PM Go to last post
  5. MLE for iid sample

    I am trying to find the MLE of theta where the pdf is f(x;theta)=theta.x^(n-1) and then show that its variance-->0 as n-->inf I have found the...

    Started by irateelf‎, 03-22-2009 03:57 AM
    • Replies: 4
    • Views: 3,626
    03-25-2009, 02:20 AM Go to last post
  6. Random sample from a gamma distribution, several questions about same problem

    Consider a random sample X1, X2, ... ,Xn from a Γ(α=3, λ=1/θ) distribution. So far i have figured the following out: p.d.f = /3Γ] x^2 e^(-x/θ)...

    Started by primomontesi‎, 03-23-2009 10:04 PM
    • Replies: 1
    • Views: 4,679
    03-24-2009, 11:50 AM Go to last post
  7. need help with constant failure rates

    Hi, I understood the concept of constant failure rates, but how do I go about a problem with identical components being tested. For eg: Suppose...

    Started by harper86‎, 03-22-2009 03:57 PM
    • Replies: 1
    • Views: 3,336
    03-23-2009, 12:37 PM Go to last post
  8. What kind of stats do I use to work this out?

    Hi guys, Just signed up so I can post this, but I lurk here quite often. I hope this is the right section. I need help finding out what kind of...

    Started by TinBane‎, 03-14-2009 06:20 PM
    • Replies: 2
    • Views: 2,907
    03-22-2009, 05:25 PM Go to last post
  9. Beauty Shop problem

    Alice and Betty enter a beauty parlor simultaneously, Alice to get a manicure and Betty to get a haircut. Suppose the time for a manicure(haircut) is...

    Started by freebird2008‎, 03-22-2009 02:13 PM
    • Replies: 0
    • Views: 3,972
    03-22-2009, 02:13 PM Go to last post
  10. Combinatorics + Statistics Question

    I have a homework question to find the probability that a permutation of 1000 symbols has between 432 and 789 cycles. X is a random variable denoting...

    Started by hgrin123‎, 03-22-2009 11:49 AM
    • Replies: 0
    • Views: 2,087
    03-22-2009, 11:49 AM Go to last post
  11. First differencing a nonstationary process

    This is something that I can't quite understand about using first differences to turn a nonstationary process into a stationary one. If we regress dY...

    Started by Tenhik‎, 03-22-2009 10:50 AM
    • Replies: 0
    • Views: 3,023
    03-22-2009, 10:50 AM Go to last post
  12. mutually exclusive events

    Hi guys, please help. I have to check whether the following events are mutually exclusive: (a) P(X) = 0.2, P(Y) = 0.3, P(Z) =...

    Started by SylviaS‎, 03-20-2009 03:33 PM
    • Replies: 6
    • Views: 2,888
    03-21-2009, 04:46 PM Go to last post
  13. Exclamation montecarlo simulation

    I wish to simulate negative binomial numbers by montecarlo method. Negative binomial (NB) is obtained by considering that the poisson parameter...

    Started by negative binomial‎, 03-21-2009 06:51 AM
    • Replies: 0
    • Views: 2,009
    03-21-2009, 06:51 AM Go to last post
  14. Venn diagram - please help

    Hi there, I need to calculate probabilities using a venn diagram... anybody has a good link or attachment on that? it would really help. thank...

    Started by SylviaS‎, 03-20-2009 03:59 PM
    • Replies: 0
    • Views: 2,605
    03-20-2009, 03:59 PM Go to last post
  15. hey guys im new and i got a question to boot =)

    hey guys im new to this forum and i got a couple of problems i cant wrap my head around ill list them here if a product has a 80% success rate....

    Started by rsantama‎, 03-16-2009 10:06 AM
    • Replies: 1
    • Views: 2,338
    03-19-2009, 02:07 PM Go to last post
  16. Exclamation help with hw problem plz!!!

    given X~Bin(400, .01) find : P(X>5) This is what I did I just want to check if I did it right. since n is so large I found the expected...

    Started by nana14‎, 03-16-2009 02:13 PM
    • Replies: 1
    • Views: 2,716
    03-19-2009, 02:04 PM Go to last post
  17. Joint Probability Question

    I was wondering if anyone knows how to do this: Five balls are drawn without replacement from an urn that contains 7 blue balls, 4 green balls and...

    Started by blues360‎, 03-17-2009 12:14 AM
    • Replies: 1
    • Views: 2,924
    03-19-2009, 02:01 PM Go to last post
  18. A problem related to Poisson process

    Hi all, I have a probability problem. Can you help me? Thank you! Here is the problem: Consider the queueing system, there are n customers 1,...

    Started by quacam09‎, 03-19-2009 12:28 PM
    • Replies: 0
    • Views: 1,990
    03-19-2009, 12:28 PM Go to last post
  19. Gelman Hierarchical Bayesian Beta Binomial model

    Hi folks: Am new to the board and hoping to post something that might be useful to someone. I'm currently trying to learn Bayesian modeling on my...

    Started by lostsoul‎, 03-17-2009 05:50 PM
    • Replies: 1
    • Views: 4,121
    03-18-2009, 03:52 PM Go to last post
  20. Simulate truncated exponential

    Hi, I have to simulate from Exp(1) which is truncated below by 0.5 using the method of inversion. That is simulate a random variable X~Exp(1)...

    Started by PeterVincent‎, 03-18-2009 11:32 AM
    • Replies: 1
    • Views: 5,705
    03-18-2009, 12:43 PM Go to last post
  21. Probability Question

    In a trivia game, there are five questions, of which I can wager 1, 2, 3, 4, or 5 points on each. (I get the points for a correct answer, but no...

    Started by dmmx3‎, 03-16-2009 03:07 PM
    • Replies: 0
    • Views: 2,188
    03-16-2009, 03:07 PM Go to last post
  22. Cumulative distribution function help!

    Hey, I'm new here. I'm stuck with this problem. Will post what I've tried to do. Hopefully someone can provide hints to help me out. Thanks. If Z...

    Started by knighty‎, 03-16-2009 12:42 PM
    • Replies: 1
    • Views: 3,680
    03-16-2009, 12:58 PM Go to last post
  23. Central Limit Theorem

    I have been trying for 3 hours and can not figure out what to do. My teacher included this section and it was not in the textbook. I do not know what...

    Started by whiteyfrom773‎, 03-15-2009 01:16 PM
    • Replies: 1
    • Views: 3,049
    03-15-2009, 01:27 PM Go to last post
  24. Binomial distribution help plz..

    A multiple-choice test has 6 questions each with 4 responses, one of which is correct. The lowest number of correct answers a student must obtain in...

    Started by salmanwashere‎, 03-14-2009 01:27 PM
    • Replies: 2
    • Views: 3,999
    03-14-2009, 04:15 PM Go to last post
  25. 13 card straight - Calculation correct?

    Hello! I am trying to compute the Pr. of being dealt a 13 card straight out of a standard 52 card deck. (ie. 23456789TJQKA) Here's my...

    Started by datune‎, 03-05-2009 10:55 AM
    • Replies: 1
    • Views: 5,338
    03-14-2009, 01:38 PM Go to last post
  26. probability excel lab

    The following lab assignment is really confusing regarding where to begin. I'm not sure if I need to use a formula or if I need to just plug the...

    Started by townerc‎, 03-12-2009 12:55 AM
    • Replies: 1
    • Views: 4,470
    03-12-2009, 04:47 PM Go to last post
  27. picking 50 yellow marbles

    If there's a jar with 663 yellow marbles out of 849 total marbles, what is probability that i will extract 50 yellow marbles in 50 tries?

    Started by medc‎, 03-09-2009 10:32 AM
    • Replies: 6
    • Views: 3,322
    03-10-2009, 11:02 AM Go to last post
  28. functions of two random variables

    Let X,Y have joint probability density function fxy(x,y)=2 and joint range space Rxy={(x,y):x>0,y>o and x+y<1} Set U=X/(1-Y) and V=Y Questions:...

    Started by xixihaha‎, 03-08-2009 09:46 AM
    • Replies: 2
    • Views: 2,798
    03-09-2009, 06:46 PM Go to last post
  29. joint distributions, marginals, conditional

    I am trying to teach myself joint distributions. I've been struggling with how to know what limits of integration to use when finding the marginal...

    Started by NicolaR‎, 03-09-2009 12:11 PM
    • Replies: 0
    • Views: 6,568
    03-09-2009, 12:11 PM Go to last post
  30. Urgent help with Home work - Please help me to understand it :)

    I have no idea how to start or how to do it. Can someone be extremely helpful ? Question 3 (Unit 1) – 10 marks (a) The random variables V...

    Started by Wallace‎, 03-08-2009 07:20 AM
    • Replies: 3
    • Views: 3,149
    03-08-2009, 02:38 PM Go to last post
  31. Using probability for pen and paper RPGs...

    A character in the game can study from concentrated magic in physical form called "vis". The amount of experience points "xp" is derived from the...

    Started by IronMan‎, 03-06-2009 07:50 PM
    • Replies: 1
    • Views: 1,997
    03-07-2009, 06:01 PM Go to last post
  32. Normality of predictors - negative binomial regression

    Hi guys, As a part of my current research project I'm conducting a sequence of negative binomial regressions with counts of crime offences from...

    Started by CowboyBear‎, 03-03-2009 08:10 PM
    • Replies: 2
    • Views: 5,020
    03-06-2009, 09:02 PM Go to last post
  33. Question Flip a coin probability problem

    Hi, I have homework problem at which I'm looking for a couple of hours now and I'm not able to solve it: Two people flip a coin (head, tail):...

    Started by lespaul‎, 03-04-2009 07:59 AM
    • Replies: 2
    • Views: 3,570
    03-05-2009, 03:12 AM Go to last post
  34. probability density function under softmax transformation.

    Hi all, Given that random vectors X and Y are related by Y = softmax(X), and X has a normal distribution with mean m and covariance matrix C. ...

    Started by superuser84‎, 03-04-2009 06:19 PM
    • Replies: 0
    • Views: 3,905
    03-04-2009, 06:19 PM Go to last post
  35. Stationary Probability for a Markov Chain problem

    I have been given a problem like this: Find the limit of p^2n as n --> infinity. Our matrix p = | 0 0 1/4 1/2 | | 0 0 3/4...

    Started by freebird2008‎, 03-04-2009 01:51 PM
    • Replies: 0
    • Views: 3,481
    03-04-2009, 01:51 PM Go to last post
  36. Need Help, how to interpret the goodness of fit, bivariate probit model

    I ran proc qlim in SAS, bivariate probit model, but dont know how to interpret the results. Could anyone please help me out of this problem.... ...

    Started by Chopin‎, 03-04-2009 04:01 AM
    • Replies: 0
    • Views: 5,501
    03-04-2009, 04:01 AM Go to last post
  37. Generate random number using Inverse Transformation Method

    Hi, I am looking for guidance on the proof of the Inverse Transformation Method to simulate a random variable having a continuous distribution. ...

    Started by PeterVincent‎, 02-03-2009 11:51 AM
    • Replies: 2
    • Views: 6,111
    03-03-2009, 12:01 PM Go to last post
  38. conditional expectation behaviour

    Hi, I had an exam the other day and I had to prove if some function was a martingale or not. I don´t remember it accurately, but I do remember I got...

    Started by stoch.Prozesse‎, 03-02-2009 09:45 AM
    • Replies: 0
    • Views: 2,575
    03-02-2009, 09:45 AM Go to last post
  39. Probability of faulty part

    Hi, The question that i am currently working on is; A company uses three machines (A,B and C) to produce electronic components. Machine A...

    Started by gisler‎, 02-24-2009 06:23 AM
    • Replies: 6
    • Views: 4,326
    03-02-2009, 09:41 AM Go to last post
  40. homework help

    I Figured out the answer...thanks for viewing... I've been staring at this problem most of the weekend and for some reason just can't seem to get...

    Started by Storminyte‎, 03-02-2009 07:56 AM
    • Replies: 0
    • Views: 1,964
    03-02-2009, 07:56 AM Go to last post
  41. Probability of sample

    How do I calculate the probability of 25 women having a mean height between 66" and 70.5". How do I find a new standard deviation?

    Started by statsgirl‎, 03-01-2009 10:14 PM
    • Replies: 3
    • Views: 3,070
    03-01-2009, 11:49 PM Go to last post
  42. "Lifetime risk"

    I need a bit of help understanding this concept. I have a paper published in Lancet that show data on the short-term and lifetime risks for...

    Started by Silvanus‎, 03-01-2009 06:21 PM
    • Replies: 2
    • Views: 2,211
    03-01-2009, 09:49 PM Go to last post
  43. something ANOVA-like?

    I apologize for re-posting this question. I posted it a month ago in the probability forum, and after more than 100 views, there was no response...

    Started by alterisis‎, 02-17-2009 02:50 AM
    • Replies: 1
    • Views: 2,061
    03-01-2009, 09:42 PM Go to last post
  44. Distribution

    Figured it out on my own :o)

    Started by statsgirl‎, 03-01-2009 07:13 PM
    • Replies: 0
    • Views: 1,783
    03-01-2009, 07:13 PM Go to last post
  45. probability,variance,moment generating function

    1. Let X denote the mean of a random sample of size 75 from the distribution that has the pdf f (x)=1, 0 <=x<=1. Calculate P (0.45 <X< 0.55). 2....

    Started by thandu3‎, 03-01-2009 12:10 PM
    • Replies: 1
    • Views: 4,268
    03-01-2009, 01:58 PM Go to last post
  46. normal distribution problem

    Question..?? I cant seem to get this right. Do I find the z-score then do the problem or... please help.. question The life span of oil-drilling...

    Started by SUNSHINE09‎, 02-28-2009 09:48 AM
    • Replies: 4
    • Views: 5,523
    03-01-2009, 11:28 AM Go to last post
  47. Confirmation: Urgent!

    Hey all, I just wrote my final exam and there were a set of questions I'm not sure I answered correctly: A deck of 52 cards is shuffled, then we...

    Started by jamesmartinn‎, 02-28-2009 07:43 PM
    • Replies: 6
    • Views: 3,023
    02-28-2009, 11:02 PM Go to last post
  48. Advanced Lotto statistics

    Hi, I posted a similar thread in the "R" posting but thought I'd may as well post here as it is generic as well. To calculate lotto probability...

    Started by richacm‎, 02-25-2009 08:55 PM
    • Replies: 3
    • Views: 2,773
    02-28-2009, 08:21 PM Go to last post
  49. Hypothesis test

    Hello, I have the following problem and I have no idea how to answer. Suppose that you are performing a one-tailed hypothesis test. " Assuming...

    Started by newuser2009‎, 02-28-2009 12:59 AM
    • Replies: 3
    • Views: 3,575
    02-28-2009, 02:06 AM Go to last post
  50. Joint Probability Distribution

    Hello all! Having a bit of problems here with making the table for a joint distribution: Question: 3 Fair coins are tossed. Let X = #of heads in...

    Started by jamesmartinn‎, 02-27-2009 05:49 PM
    • Replies: 6
    • Views: 10,313
    02-27-2009, 07:51 PM Go to last post
  51. Student Enrollment Probability

    Hey everyone, back again with another problem giving me problems. A local university reports that 3% of their students take their general...

    Started by hackman2007‎, 02-23-2009 06:30 PM
    • Replies: 6
    • Views: 8,293
    02-27-2009, 07:44 PM Go to last post
  52. Poisson Random Variables

    Hey all, I have a very difficult statistics problem and it would be awesome if someone could help out. Full credit to whomever figures this, lots of...

    Started by firesail‎, 02-27-2009 02:54 AM
    • Replies: 2
    • Views: 3,371
    02-27-2009, 09:20 AM Go to last post
  53. probability distribution

    A dealer sells 3 different models of a freezer having 12,14, and 16 cubit feet of storage respectively. Let x= the amount of storage pace purchased...

    Started by th3plan‎, 02-26-2009 09:55 PM
    • Replies: 2
    • Views: 3,400
    02-27-2009, 06:56 AM Go to last post
  54. Question Homework help

    Hello. I have a minor set back on my homework. So I have a homework problem which states find the probability of the indicated event if...

    Started by LeslieF‎, 02-26-2009 11:14 AM
    • Replies: 5
    • Views: 19,422
    02-26-2009, 11:15 PM Go to last post
  55. help with problem

    Basic probablity question , someone help? A 2-out-of-3 system is one that will function properly if at least 2 of the 3 individual components in the...

    Started by th3plan‎, 02-26-2009 02:19 PM
    • Replies: 1
    • Views: 2,734
    02-26-2009, 03:02 PM Go to last post
  56. study guide problem..having trouble

    a mail order firm uses a parcel service 60% of the time with the order being late 2% of the time. The other 40% is used by local transportaion and is...

    Started by laneswilets‎, 02-26-2009 02:54 PM
    • Replies: 0
    • Views: 2,134
    02-26-2009, 02:54 PM Go to last post
  57. Binomial Expectation

    I'm having a little problem following this Y~Bin(5,1/3) Find: E = E = 4E - 4E - 1

    Started by jamesmartinn‎, 02-25-2009 11:18 PM
    • Replies: 3
    • Views: 2,738
    02-26-2009, 09:36 AM Go to last post
  58. Random Variable Transforms help

    1) Suppose X is an Exponential random variable with parameter λ: f(x) = λe-λx, for x > 0, where λ satisfies λ > 0 (a) Let U be a Uniform...

    Started by nine4fours‎, 02-25-2009 12:20 PM
    • Replies: 1
    • Views: 3,193
    02-25-2009, 02:52 PM Go to last post
  59. Probabilistic Independence

    Hi, First time poster. Hopefully I won't break any rules. I'm sure you will let me know if I did. Question: Suppose that two dice are tossed....

    Started by urfriend‎, 02-24-2009 10:34 PM
    • Replies: 5
    • Views: 2,597
    02-25-2009, 06:35 AM Go to last post
  60. normal distribution probability problem

    ive got a problem that i have already solved and i am looking for verification it is right: eggs produced have an unknown distribution with a mean...

    Started by subopolois‎, 02-24-2009 05:16 PM
    • Replies: 3
    • Views: 2,831
    02-24-2009, 07:52 PM Go to last post

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