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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: 30,175
    09-30-2005, 09:44 AM Go to last post
  1. probability of a random sample without replacement

    I'm having problems on how to approach the following question: Suppose that we have a very large collection of marbles, 30% of which are red, 20%...

    Started by thenumber5‎, 12-03-2010 05:36 PM
    • Replies: 1
    • Views: 4,478
    12-03-2010, 06:28 PM Go to last post
  2. Random number generation - Use Bernoulli for tennis match series?

    Q. The probability of A winning a game of tennis against B is 0.74 Simulate a best of 5 sets (first to win 3) between A and B. Use the following...

    Started by languagelearner23‎, 04-15-2011 05:57 PM
    • Replies: 3
    • Views: 4,475
    04-18-2011, 03:34 AM Go to last post
  3. Need help with this problem asap

    1. The average number of calls received by a switchboard in a 30-minute period is 15. What is the probability that between 10:00 and 10:30 the...

    Started by brigog‎, 03-30-2008 08:44 PM
    • Replies: 0
    • Views: 4,474
    03-30-2008, 08:44 PM Go to last post
  4. Probability

    Hi I am wondering how to find the probability of a number if only given the standard deviation and the mean. The question states the following: ...

    Started by Oreding‎, 04-06-2011 07:24 PM
    • Replies: 1
    • Views: 4,473
    04-06-2011, 08:19 PM Go to last post
  5. Is it possible to calculate a binomial distribution with a non-constant p?

    Here's the actual problem I'm faced with. Suppose a segment of dna with 100 mutations (SNPs) which occur at different frequencies from each other and...

    Started by jonnybgood‎, 08-25-2010 11:05 AM
    • Replies: 4
    • Views: 4,469
    08-26-2010, 12:04 AM Go to last post
  6. Poisson process, last arrival in interval

    Consider a Poisson process with rate lambda. Let L be the following r.v.: if there is an arrival in , then L is the time of the last arrival in ; if...

    Started by Ego7894612‎, 09-01-2010 09:24 PM
    • Replies: 1
    • Views: 4,463
    09-02-2010, 08:48 AM Go to last post
  7. Urgent Help Please

    :( I have this statistics problem that i must solve as soon as possible. You have 5 oil paints and 6 water paints. The director of the museum...

    Started by tik‎, 10-06-2005 01:52 AM
    • Replies: 3
    • Views: 4,461
    10-06-2005, 08:46 AM Go to last post
  8. question involving standard cauchy distribution

    nvm solved it. - X1, X2, X3, ... are independent random variables with a standard Cauchy distribution. Prove or disprove the following. ...

    Started by evalover1987‎, 09-25-2010 07:07 PM
    • Replies: 1
    • Views: 4,461
    09-25-2010, 07:24 PM Go to last post
  9. random question about non-Guassian multivariate distributions...

    today in my seminar we were talking about all these interesting ways people can start with random uniform distributions and through doing and...

    Started by spunky‎, 03-07-2012 07:19 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 4,459
    03-09-2012, 07:55 PM Go to last post
  10. Question question about a normal distribution probability homework

    hello everyone ; glad to be here with you :D i hope you'll help me to resolve this problem exercise : we inform you that's 84,13% of the...

    Started by Moorish‎, 12-11-2010 08:49 AM
    • Replies: 8
    • Views: 4,458
    12-12-2010, 06:14 PM Go to last post
  11. Help with 3D Gaussian Distribution Formula in Excel?

    Hi Everyone, I am looking for some help! I am not a statistician but use 3 Gaussian distributions in my work which is all Excel based. I...

    Started by Felix‎, 12-21-2013 06:48 PM
    • Replies: 2
    • Views: 4,454
    12-23-2013, 11:22 AM Go to last post
  12. Need Extreme Help!!!

    Here is the problem I am having trouble with. A tire company finds the lifespan for one brand of its tires is normally distributed with a mean of...

    Started by ryanl‎, 04-26-2008 12:40 PM
    • Replies: 2
    • Views: 4,450
    04-26-2008, 07:44 PM Go to last post
  13. Hypergeometric distribution - expected value derivation

    Hello, I just had a question regarding deriving the expected value of the Hypergeometric(N,M,n) distribution. I know that the expected value is...

    Started by GTaiko‎, 05-22-2012 06:40 PM
    • Replies: 3
    • Views: 4,449
    06-16-2012, 01:30 AM Go to last post
  14. Duplicate sample probability

    I have a population of N unique items, and I take n random samples (with replacement, so some items may be sampled more than once). If I then take...

    Started by emmental‎, 11-26-2012 06:46 PM
    duplication, sample
    • Replies: 8
    • Views: 4,448
    11-28-2012, 07:37 AM Go to last post
  15. Bayesian vs. Frequentist

    Hi, I am a college student who has taken a course in frequentist probility learned a little bit of Bayesian probability. I don't know enough to...

    Started by whomp‎, 05-06-2012 04:01 PM
    • Replies: 8
    • Views: 4,446
    07-03-2012, 03:43 PM Go to last post
  16. probability tree

    Suppose 1 in 25 adults is afflicted with a disease for which a new diagnostic test has been developed. Given that an individual actually has the...

    Started by agclifto‎, 10-05-2007 05:51 PM
    • Replies: 0
    • Views: 4,445
    10-05-2007, 05:51 PM Go to last post
  17. Empirical Rule of 68-95-99.7 vs. Corresponsing probability from Z-table

    The Empirical Rule states that "Assuming the population exhibit a normal (bell-curved) distribution, about 68.27% of the values lie within 1 standard...

    Started by suewitch‎, 02-27-2012 11:52 AM
    • Replies: 2
    • Views: 4,445
    02-27-2012, 01:17 PM Go to last post
  18. Gamma Difference Distribution

    What is the distribution of the difference of two gamma distributions with same scale parameter, and shape parameter of the first one is k(1+e), e ->...

    Started by ashish1789hota‎, 09-19-2011 09:19 AM
    gamma distribution
    • Replies: 1
    • Views: 4,443
    09-19-2011, 10:43 AM Go to last post
  19. sigma algebra and expectation

    Are the following true or false ? Explain your answers. (If it is false, giving a counter example will do.) 1) If \displaystyle A_j \in ...

    Started by madara123‎, 06-18-2011 05:44 AM
    • Replies: 6
    • Views: 4,442
    06-18-2011, 02:25 PM Go to last post
  20. 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: 4,438
    03-12-2009, 04:47 PM Go to last post
  21. Exclamation Prob of happening by chance

    Say I have 1000 balls. 50% are blue, 50% are red. Someone trys to convince me they can pick red balls from the bag without looking at the balls. ...

    Started by Adam‎, 04-08-2008 07:02 PM
    • Replies: 9
    • Views: 4,437
    04-22-2008, 09:16 PM Go to last post
  22. A probability/stat elementary problem

    Hi, I am currently reviewing probabilities on my own and encountered problems which i can't seem to do. Hopefully someone here will be kind enough to...

    Started by gavinwkc‎, 01-29-2007 11:42 AM
    • Replies: 2
    • Views: 4,436
    01-31-2007, 01:54 PM Go to last post
  23. circuit failure

    A message is transmitted using a binary code of 0's and 1's. Each transmitted bit (0 or 1) must pass through three relays before reaching a receiver....

    Started by roldy‎, 09-10-2007 11:26 PM
    • Replies: 1
    • Views: 4,432
    09-11-2007, 12:17 AM Go to last post
  24. Confidence Interval homework check if correct

    1. 68.6 I did this by solving for x with this equation .004=1.96(.14/sqroot of x) 2.84.72% I found this by finding zscore for 1.43 which was...

    Started by schoolboy29‎, 10-19-2010 02:11 PM
    • Replies: 5
    • Views: 4,432
    10-19-2010, 04:56 PM Go to last post
  25. Binomial MLE

    Hello, I need some clarification on the following problem. Suppose Y ~ Bin (189, 59/189) Graphically show the likelihood function and...

    Started by jamesmartinn‎, 10-03-2010 02:02 PM
    • Replies: 1
    • Views: 4,428
    10-04-2010, 02:25 AM Go to last post
  26. Binomial distributions

    A total of 16 mice are sent down a maze, one by one. From previous experience, it is believed that the probability a mouse turns right is .38 a)...

    Started by klsybrns‎, 10-12-2012 01:33 PM
    • Replies: 1
    • Views: 4,425
    10-12-2012, 09:25 PM Go to last post
  27. generalized gamma distribution random numbers

    Hi there, Does anyone know how to generate random numbers from the generalized gamma distribution?? If you want to check the density take a look...

    Started by leo nidas‎, 11-03-2008 07:26 AM
    • Replies: 1
    • Views: 4,424
    11-03-2008, 07:38 AM Go to last post
  28. Smile Probability

    Question : Jane wants to do her MSc in statistics. She appliesa to two universities. Assume the acceptance rate at University A is 25% and at...

    Started by edwim12‎, 09-06-2005 08:49 PM
    • Replies: 4
    • Views: 4,421
    10-15-2006, 05:57 AM Go to last post
  29. Bartels: Cycles test of signifcance

    I have this pdf doc that explains the formula of Bartels , the test of a cycle significance on a time series. I am trying to put it into excel .....

    Started by icm63‎, 08-21-2010 08:02 PM
    • Replies: 1
    • Views: 4,421
    01-22-2013, 04:03 AM Go to last post
  30. Normal distribution question

    X is normally distributed with mean 100 and variance 81. What is the probability that X will lie between 88 and 112? Here is my approach:...

    Started by ohgallen‎, 01-10-2011 06:40 AM
    • Replies: 7
    • Views: 4,411
    01-12-2011, 05:28 AM Go to last post
  31. Question Binomial Probability, Real Limits, X=0

    Can someone have guessed on quiz and got all 50 questions wrong, but still get 100%? Thanks in advance! :D

    Started by jimbrowsky‎, 10-16-2011 01:22 AM
    binomial, binomial distribution, binomials, continuous, real limits
    • Replies: 7
    • Views: 4,411
    10-16-2011, 04:36 PM Go to last post
  32. System of 5 independent components

    I have done problems similar to this one with 4 components but im getting stumped with this one. The probability of FAILURE for each components is...

    Started by gator78‎, 10-11-2010 05:42 PM
    • Replies: 8
    • Views: 4,409
    10-12-2010, 09:25 AM Go to last post
  33. A probability question

    A spider eats 3 flies a day. Until the spider fills his quota a fly has a 50% chance of survival if he attempts to pass the web. Assuming 5 flies...

    Started by tennis89‎, 06-28-2010 10:28 PM
    • Replies: 1
    • Views: 4,403
    06-29-2010, 12:59 AM Go to last post
  34. Probability with sampling question

    i have been having problems with what should be a trivial probability problem Suppose there are 130 patients. Each patient was administered one of...

    Started by hyperion111‎, 08-05-2012 10:39 PM
    2 Pages
    1 2
    conditional probability, probability
    • Replies: 17
    • Views: 4,398
    08-06-2012, 12:18 AM Go to last post
  35. The famous cereal box prizes puzzle

    One version says that a cereal company puts four different prizes one in each of all their boxes. The prizes are evenly distributed. How many...

    Started by arkane‎, 10-01-2010 02:33 AM
    • Replies: 0
    • Views: 4,397
    10-01-2010, 02:33 AM Go to last post
  36. Transition Probability

    Hi. I have a question about transition probability. Q) Markov chain on states {0,1,2,3,4,5} has transition probability matrix (which is 6 by 6...

    Started by jjangub‎, 10-31-2010 01:23 PM
    • Replies: 7
    • Views: 4,395
    11-03-2010, 05:46 PM Go to last post
  37. Question problems with MGF

    Here are 2 similar kind of problems regarding MGF. So I'm posting on the same thread. Hope there is no problem. 1)MGF of a rv is given by...

    Started by Sambit‎, 01-04-2011 09:08 AM
    • Replies: 1
    • Views: 4,395
    01-04-2011, 10:08 AM Go to last post
  38. Question Help with A HOMEWORK PROBLEM

    Hello to all Daryl shuffles a standard deck of cards (13 cards in each of four suits) and draws one card. Then Daryl replaces the card, shuffles...

    Started by Lyly‎, 01-09-2009 08:38 PM
    • Replies: 14
    • Views: 4,393
    01-12-2009, 10:36 AM Go to last post
  39. Problem with bayesian updating example

    Hi everybody, I have an example in bayesian statistics which I've worked on for some hours now, without significant success. The problem is the...

    Started by Bayesianski‎, 11-24-2010 09:57 AM
    • Replies: 2
    • Views: 4,392
    11-26-2010, 01:43 AM Go to last post
  40. Probability

    Hello to everyone... I'm very new to stats and have worked through my assignments but am not sure I'm on the right track. The question is: Two...

    Started by ShannonL‎, 10-24-2005 09:44 PM
    • Replies: 5
    • Views: 4,386
    10-24-2005, 10:36 PM Go to last post
  41. 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: 4,385
    12-28-2009, 12:30 AM Go to last post
  42. 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: 4,385
    12-26-2009, 11:04 PM Go to last post
  43. I have questions ??

    Hi I have 3 questions. Let x1, . . . , xn be independent observations of a chi-square(k) random variable, with p.d.f. f(x)= 1/(2^k/Γ(k/2)) ...

    Started by Dodi‎, 11-24-2010 07:47 PM
    • Replies: 1
    • Views: 4,385
    11-25-2010, 03:08 AM Go to last post
  44. "Six nines" reliability vs. safety factor

    Aircraft are supposed to have a 99.9999 % chance that they will work over some specified time interval. If a picture weighs 25# and you want the...

    Started by Outlier‎, 05-20-2011 10:41 AM
    • Replies: 3
    • Views: 4,385
    05-20-2011, 06:05 PM Go to last post
  45. probability question please help

    need help understanding this question please? the number of lightning strikes on a square kilometer of open ground in a year has mean 6 and standard...

    Started by dsnyder1‎, 10-24-2011 02:38 PM
    • Replies: 1
    • Views: 4,384
    10-25-2011, 02:35 AM Go to last post
  46. Probability for 20 people

    Hi, I'm not a stats student, I'm a university student reviewing some literature and I'm interested in some of the statistics related to it and how...

    Started by ae5‎, 12-16-2010 04:09 PM
    • Replies: 5
    • Views: 4,377
    12-16-2010, 06:55 PM Go to last post
  47. Credit Card Probability

    Last year 75% of Kmart Department Stores credit card purchases were for less than $150. In a random sample of 200 credit card companies, what is the...

    Started by TI30‎, 12-05-2010 01:54 PM
    • Replies: 2
    • Views: 4,374
    12-05-2010, 08:03 PM Go to last post
  48. circular permutation

    Hello: I have a probability problem I would like some takes on, please. "There are 5 boys and 3 girls sitting around a circular table. What is...

    Started by galactus‎, 08-10-2006 10:29 AM
    • Replies: 5
    • Views: 4,373
    08-17-2006, 09:41 AM Go to last post
  49. What is meant by mod

    X(i,j)=k mod 4, Where (i,j=1,...6) & k=i+j Everything is clear, but what is meant by mod 4 here?

    Started by sajee3a‎, 09-18-2010 02:05 AM
    • Replies: 2
    • Views: 4,371
    09-21-2010, 02:27 AM Go to last post
  50. Exclamation Normal Distribution Problem

    Hi, I've been working on this problem for a while now and keep getting stuck. The problem says, The length of time before a cell phone using a...

    Started by Cinny_72‎, 04-25-2007 04:24 PM
    • Replies: 1
    • Views: 4,368
    07-03-2007, 01:37 PM Go to last post
  51. defective parts

    The ABC manufacturing company purchases a certain part from two suppliers (A supplier & B supplier). The parts received from the suppliers are used...

    Started by psu2007‎, 07-10-2009 01:29 PM
    • Replies: 0
    • Views: 4,368
    07-10-2009, 01:29 PM Go to last post
  52. 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: 4,368
    11-13-2009, 04:13 PM Go to last post
  53. A Problem on Joint Probability Distribution

    Hello people, I found this problem in an exam but i could not go very far on this. Problem: Let X and Y be jointly distributed random variables...

    Started by kamekaze‎, 12-10-2010 12:52 PM
    • Replies: 4
    • Views: 4,368
    07-12-2013, 10:20 PM Go to last post
  54. fizz fizz away

    okay one more for you that i think I know the answer. i apologize if these must seem easy and I may seem :confused: but hey i am not the brightest...

    Started by hilarysears77‎, 10-07-2005 08:13 PM
    • Replies: 1
    • Views: 4,362
    10-07-2005, 08:57 PM Go to last post
  55. sealed bid problem

    Your company is making a sealed bid for a construction project. If your firm has the lowest bid, you will pay another firm (a subcontractor) 140...

    Started by trbbls‎, 02-26-2008 03:15 PM
    • Replies: 1
    • Views: 4,362
    02-26-2008, 05:27 PM Go to last post
  56. expectation of conditional probability

    Hi there, I have two questions which I found answers to slightly different version of them in books but not to those that I have in mind so please...

    Started by sangiobbe‎, 08-24-2011 11:56 AM
    conditional probability
    • Replies: 12
    • Views: 4,362
    08-25-2011, 02:09 PM Go to last post
  57. Question finding MLE

    f(x,y)=\frac{\theta}{4}, if (x,y)=(0,0),(1,1) =\frac{2-\theta}{4}, if (x,y)=(0,1),(1,0) Find MLE of \theta where 0\leq\theta\leq 2

    Started by Sambit‎, 05-11-2011 12:15 PM
    • Replies: 8
    • Views: 4,361
    05-13-2011, 08:05 AM Go to last post
  58. Stats Homework

    I am getting ready for my test in a couple of hours actually, but I have a practice test I am attempting now. Their are 2 problems I can't seem to...

    Started by Lysolchip‎, 03-21-2006 05:59 PM
    • Replies: 1
    • Views: 4,357
    03-21-2006, 09:01 PM Go to last post
  59. Question Chi Squared : Explaining the numbers

    Hello! Thank you in advance for your help and I hope I have posted this in the correct section. My question involves verbally explaining chi...

    Started by Noah41‎, 04-10-2012 06:50 AM
    • Replies: 2
    • Views: 4,357
    04-11-2012, 02:49 AM Go to last post
  60. How to determine data has Poisson Distribution

    Hi there Can some one suggest me how i can determine data has poisson distribution? Actually i want to analyze the relationship between these...

    Started by Mandeep‎, 05-08-2009 10:52 PM
    • Replies: 0
    • Views: 4,352
    05-08-2009, 10:52 PM Go to last post

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