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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: 31,052
    09-30-2005, 09:44 AM Go to last post
  1. counting problem?

    A closet contains 6 different pairs of shoes. Five shoes are drawn at random. What is the probability that at least one pair of shoes is obtained?

    Started by anyavacy‎, 10-22-2013 06:14 PM
    • Replies: 2
    • Views: 1,312
    11-11-2013, 05:48 PM Go to last post
  2. probability problem that's been messing with my head. Please at least look at it

    I'm taking a liberal arts math at my college and the teacher gave us a take home test. There is one probability problem that's just not clicking....

    Started by sergio1er‎, 11-07-2013 05:02 PM
    drawn at random, percent, probability
    • Replies: 2
    • Views: 2,531
    11-09-2013, 06:17 PM Go to last post
  3. Help on confidence interval

    A random sample of 35 undergraduates from Spring 2013 had a mean grade on these small point value assignments of 69.49 and a standard deviation of...

    Started by ted160‎, 11-09-2013 12:34 AM
    • Replies: 0
    • Views: 1,176
    11-09-2013, 12:34 AM Go to last post
  4. Probability of Being Displaced

    Hi all, I'm trying to work out the probability of an animal being displaced from a resource at different life stages. For example there are five...

    Started by killbot2000‎, 11-08-2013 06:52 AM
    • Replies: 0
    • Views: 1,192
    11-08-2013, 06:52 AM Go to last post
  5. Probability with replacement

    Hello, I have the following question which I'm really struggling with. The data come from the records of an estate agent and relate to sales of...

    Started by watp‎, 11-06-2013 05:10 PM
    • Replies: 3
    • Views: 3,730
    11-07-2013, 02:21 PM Go to last post
  6. Plinko Poker Promotion

    We are going to start a Plinko Poker Promotion at my local card room and the board is set up as follows: 9 spots at the bottom, 1 ace, 2 kings, 2...

    Started by stdrdm22‎, 11-05-2013 11:07 PM
    • Replies: 0
    • Views: 1,642
    11-05-2013, 11:07 PM Go to last post
  7. Consistent estimator proof. plz help me out in this proof?

    I dont know how to prove this one: Let h(x) ia an even function, nondecreasing and non negative for x. Then, E goes to zero, for all θ implies that...

    Started by Hadeel_h‎, 11-05-2013 05:21 AM
    • Replies: 3
    • Views: 2,197
    11-05-2013, 01:10 PM Go to last post
  8. Probability of Yahtzee game

    Hi, i am new to this forum. Sorry if i post in wrong place. Have anyone played Yahtzee game? It's a popular game with 5 dice and you can roll up...

    Started by Bruce Kally‎, 11-03-2013 08:45 AM
    • Replies: 3
    • Views: 2,066
    11-03-2013, 09:59 PM Go to last post
  9. Probabilty of picking a card in a deck

    I've never been very good in probability but I want to know how to calculate this. This is not a homework assignment or anything I am just curious....

    Started by tralli‎, 11-02-2013 02:17 PM
    • Replies: 6
    • Views: 1,973
    11-03-2013, 07:37 AM Go to last post
  10. Comparing and balancing two outcome-production methods

    Hi, I've a question. :) I have a soccer videogame where teams have different strengths (16 to 621). The result of a match between two teams can be...

    Started by milivella‎, 11-02-2013 06:32 PM
    • Replies: 1
    • Views: 1,670
    11-03-2013, 04:06 AM Go to last post
  11. Amateur has a question please

    My wife and I have been married for 30 years. During all this time neither my wife, nor her father (my father-in-law), have had an auto accident. We...

    Started by Forensics1‎, 10-30-2013 08:36 PM
    • Replies: 5
    • Views: 1,998
    11-02-2013, 08:54 PM Go to last post
  12. Geometric Distribution problem

    Hi, I have a quick question: 1. I have a universe that has 40% of it with a condition Z (Success). 2. Of those 40%, 15% of them have condition...

    Started by eli.toohey‎, 10-31-2013 10:14 PM
    • Replies: 0
    • Views: 1,138
    10-31-2013, 10:14 PM Go to last post
  13. Error bars for unknown distribution

    I recently made a graph where I show the error bars for a certain number of "experiment". In another way, in my algorithm I'm minimizing the...

    Started by gmeroni‎, 10-30-2013 03:35 AM
    confidence interval, unknown distribution
    • Replies: 0
    • Views: 1,289
    10-30-2013, 03:35 AM Go to last post
  14. Looking for terms/formuals to use.

    I am seeking a way to express a problem (and know very little). I have a 60 card deck (MTG) that can contain up to 4 of the same cards. What is...

    Started by irons‎, 10-29-2013 03:37 PM
    • Replies: 1
    • Views: 1,971
    10-29-2013, 07:51 PM Go to last post
  15. Who can solve this probability problem?

    Hi all, We have a population of people (denoted by S=30000). Assume that we want to divide this population into groups (denoted by D) consisting...

    Started by zFADwww7‎, 10-29-2013 04:26 PM
    • Replies: 0
    • Views: 1,363
    10-29-2013, 04:26 PM Go to last post
  16. cross term

    The book says that the following cross term can be shown to be zero by iterating the expectation: E. What does it mean "to iterate the...

    Started by Kiuhnm‎, 10-28-2013 07:40 AM
    expectation
    • Replies: 1
    • Views: 1,092
    10-28-2013, 09:52 AM Go to last post
  17. Poisson Distribution Question: Probability, Mean and Variance

    Just Slow Down is a public awareness campaign in Winnipeg to help drivers understand the relationship of excessive speed to traffic collisions,...

    Started by Trae88‎, 10-27-2013 07:57 PM
    • Replies: 7
    • Views: 2,540
    10-27-2013, 10:37 PM Go to last post
  18. Poisson question

    Can anyone shed some light on this one? When cycling home at night, I notice that sometimes my rear light is switched off when I arrive home....

    Started by Youler‎, 06-05-2012 08:55 AM
    • Replies: 1
    • Views: 5,023
    10-27-2013, 07:25 PM Go to last post
  19. Random variables and probability distributions

    The question i need help to is below: Laboratory tests on a large shipment of radios revealed that 6.5% are defective. On arrival of the...

    Started by Undergrad1‎, 10-27-2013 06:57 PM
    probability, random, statistics, urgent, variables
    • Replies: 1
    • Views: 1,774
    10-27-2013, 07:13 PM Go to last post
  20. Please help me with stastictical test in R...

    Hello! Please help me! I have data set like following table: group x1 x2 ... xn 0 * * ... * 0 * * ... * 1 * ...

    Started by Nastasya‎, 10-27-2013 05:27 PM
    • Replies: 0
    • Views: 1,233
    10-27-2013, 05:27 PM Go to last post
  21. Possible Outcomes and their Corresponding Probabilities

    I have this question here that is confusing me a lot. I think it may be the wording. But here it is: ``Inability to get along with others`` is the...

    Started by Trae88‎, 10-27-2013 02:40 PM
    • Replies: 4
    • Views: 2,141
    10-27-2013, 04:47 PM Go to last post
  22. Compuite P{X < Y} conditioned on the value of Y; intuition behind it.

    Dear people, I have a question concerning the following steps to compute P{X < Y}. The steps shown are the following: P{X < Y} = \int P(X <...

    Started by Mkkl‎, 10-27-2013 04:26 AM
    • Replies: 1
    • Views: 1,540
    10-27-2013, 07:54 AM Go to last post
  23. Lebesgue Measure (Please help)

    Could you please help me how to solve this question any hint will be appreciated. Thanks in advance.

    Started by MKL56‎, 10-25-2013 10:23 AM
    • Replies: 4
    • Views: 1,566
    10-25-2013, 02:51 PM Go to last post
  24. Red face Probability Question (Ambiguous)

    SOLVED BY MYSELF, YOU CAN CLOSE THE THREAD :) Hi guys, I'm new to this forum, and some of you might find it annoying that I post a question...

    Started by cluborange‎, 10-24-2013 04:28 PM
    conditional probability, homework, probability, question
    • Replies: 1
    • Views: 1,555
    10-24-2013, 05:02 PM Go to last post
  25. MLE of a weirdly split lambda in a Poisson distribution

    Hi everyone! :) I'm new here. I have been looking everywhere for the solution to this problem so here's to hoping some of you can help me. :) ...

    Started by L1meta‎, 10-22-2013 07:35 AM
    mle, poisson distribution
    • Replies: 6
    • Views: 2,791
    10-24-2013, 06:39 AM Go to last post
  26. Finding probability of unknown distribution

    The problem states: Given the following soil water content data and making no distributional assumptions, what is the probability that the next...

    Started by KokoGoose‎, 10-23-2013 02:05 PM
    • Replies: 1
    • Views: 1,560
    10-23-2013, 02:25 PM Go to last post
  27. Calculating probability that a business will find a buyer and sell

    Bare with me whilst I try and explain this one. I work for a business that finds companies to buy a client business that's signed up with us. I have...

    Started by sallwright‎, 10-23-2013 02:56 AM
    business, economics, multi-variable, probability
    • Replies: 0
    • Views: 1,160
    10-23-2013, 02:56 AM Go to last post
  28. Need help with basic probability scenario (not hw)

    Rephrasing the scenario into a word problem for the sake of simplicity. I hope it doesn't get convoluted, but then again explaining the actual...

    Started by rw90‎, 05-11-2013 04:29 PM
    • Replies: 9
    • Views: 1,904
    10-23-2013, 01:12 AM Go to last post
  29. string counting problem

    We consider permutations of the string ĒABACADAFAGĒ. How many permutations are there? How many of them donít have any A next to other A? How many...

    Started by anyavacy‎, 10-22-2013 06:15 PM
    • Replies: 0
    • Views: 1,402
    10-22-2013, 06:15 PM Go to last post
  30. conditional probability

    The table below displays data the First Bank of Silverhaven (FBS) has collected on the personal savings accounts of its job-holding customers. The...

    Started by likewhat22‎, 07-04-2012 09:45 PM
    probability
    • Replies: 3
    • Views: 11,200
    10-22-2013, 12:40 PM Go to last post
  31. NEED HELP URGENT! Probability Question

    How can we arrange 10 boys and 15 girls in such way that no two boys are adjacent to each other? Please help math geniuses.

    Started by tenzdorj‎, 10-22-2013 10:27 AM
    permutation, probability question
    • Replies: 4
    • Views: 1,785
    10-22-2013, 11:29 AM Go to last post
  32. Normal Probability and finding standard deviation

    "The weekly earnings of fastfood restaurant employees are normally distributed with a mean of $395. If only 1.1% of the employees have a weekly...

    Started by Lorelei7‎, 10-21-2013 10:11 PM
    • Replies: 4
    • Views: 3,635
    10-22-2013, 09:58 AM Go to last post
  33. proportion of a sample

    Hi. Could someone help me answer the last 3 blank boxes? I got 0.2, 0.05 and sqrt(0.2*0.8/150) for the first 3 boxes. A researcher in Food...

    Started by willy0625‎, 10-21-2013 06:44 PM
    probabilty, sample
    • Replies: 0
    • Views: 1,477
    10-21-2013, 06:44 PM Go to last post
  34. Probability Question related to GMAT

    There are a total of 60 white and red balls in the box. A ball in picked randomly. If the probability of picking a white ball is 2/5. How many red...

    Started by kamranlatif‎, 10-21-2013 03:47 PM
    • Replies: 1
    • Views: 1,261
    10-21-2013, 05:56 PM Go to last post
  35. Groups of dice probability

    I am new to Statistics and this was a homework that was given to us. I was able to come up with the answer during the class last week, but my...

    Started by rollypolly14‎, 10-21-2013 12:10 PM
    • Replies: 2
    • Views: 1,464
    10-21-2013, 01:08 PM Go to last post
  36. Probability question

    An Mechanical part has an average life expectancy of 10,500 hours of operation. A Six Sigma team has incorporated some design changes to improve the...

    Started by naveensangisetty‎, 10-21-2013 02:21 AM
    • Replies: 4
    • Views: 1,205
    10-21-2013, 12:59 PM Go to last post
  37. Value that increases the Standard Deviation

    Hello, I am puzzled by the following statement " In order to increase the standard deviation of a set of numbers, you must add a value that...

    Started by JohnK‎, 10-20-2013 07:08 AM
    • Replies: 2
    • Views: 1,855
    10-20-2013, 05:30 PM Go to last post
  38. Probability of deviation in sample proportion

    Hi! Iím very new to statistics and Iím stuck on what formula to use for an assignment. I have the information that 32.19 % of my population is...

    Started by Krapula‎, 10-18-2013 06:31 AM
    • Replies: 5
    • Views: 1,916
    10-19-2013, 01:49 PM Go to last post
  39. Proof the sum of two CDF's is a CDF.

    This is a question my instructor asked in the last midterm exam but nobody was able to solve and he's suggesting it may come out again in the finals:...

    Started by adejames2000‎, 10-18-2013 05:24 PM
    cdf, mathematical statistics, probabilities, probability distribution, proof
    • Replies: 4
    • Views: 3,300
    10-18-2013, 10:02 PM Go to last post
  40. integrating joint probability distribution

    Hi, could you help me in compute the integral with respect to x of f(x,y)d(x,y) where f(x,y) is a joint probability distribution? I know that the...

    Started by stellina‎, 10-18-2013 12:43 PM
    integration, joint density, joint distribution, joint probabilities, joint probability
    • Replies: 3
    • Views: 1,396
    10-18-2013, 02:52 PM Go to last post
  41. Geometrci random walk

    Hi! I need help! l I need simulate process - geometric random walk for modeling the behavior of the price of a stock over time. state space is...

    Started by sunny45‎, 10-18-2013 10:15 AM
    • Replies: 1
    • Views: 1,404
    10-18-2013, 12:57 PM Go to last post
  42. Probability Help

    I'm having some trouble trying to figure this out: James is going to write an exam Suppose that if he hadn't passed in previous attempts, each...

    Started by asdfman‎, 10-17-2013 08:00 PM
    • Replies: 3
    • Views: 2,303
    10-18-2013, 01:16 AM Go to last post
  43. How to calculate the probability of a node failing in a network

    Hello all, I am trying to understand networks etc and put some maths in it. Of course, real networks dont have a simple tree structure in order to...

    Started by vresv‎, 10-17-2013 08:01 AM
    • Replies: 0
    • Views: 2,296
    10-17-2013, 08:01 AM Go to last post
  44. I need to work out probability of getting a medical condition

    Hi folks I need to work out the probability of a medical side effect arising and I am not sure how to do it. Background: I have three known...

    Started by whaley‎, 10-16-2013 07:14 AM
    • Replies: 0
    • Views: 1,546
    10-16-2013, 07:14 AM Go to last post
  45. Variance of two deterministic distributions

    I would like to know the variance of two deterministic distributions when putting them together. Of course the variance of the two seperate...

    Started by people‎, 10-12-2013 05:21 AM
    • Replies: 4
    • Views: 3,696
    10-15-2013, 01:22 AM Go to last post
  46. Question Investing in funds

    Hello, maybe someone can help me here? That would be awesome. I have an exam coming up and need to understand this... Linda invests her money in...

    Started by Camana‎, 10-14-2013 01:33 PM
    • Replies: 0
    • Views: 3,870
    10-14-2013, 01:33 PM Go to last post
  47. Dice Roll Game Probabilities

    Hello everyone, I have a bit of a probability question for you as it has been quite awhile since I have been in school, and I canít remember the...

    Started by BillMisc‎, 10-13-2013 10:50 AM
    • Replies: 3
    • Views: 2,134
    10-13-2013, 01:36 PM Go to last post
  48. Post Whats its the probability of the mentioned two scenarios ?

    Hi fellas I am new to this forum . Can you help it with this The Smallville Daily wants the number of pages of its paper that are really...

    Started by supercool‎, 10-13-2013 05:19 AM
    • Replies: 1
    • Views: 1,380
    10-13-2013, 10:33 AM Go to last post
  49. the set of all possible nXn covariance matrices....

    ....is infinite countable or uncountable?

    Started by spunky‎, 10-12-2013 06:31 PM
    • Replies: 2
    • Views: 1,236
    10-12-2013, 08:09 PM Go to last post
  50. Thumbs up Linear Probability Model problem (Binary dependent variables)

    y i =a+bD i +u i ,i=1,…,n (LPM equation) Always thank you for your helps! I have a question about Linear Probability Model. You can see the...

    Started by androman‎, 10-12-2013 11:34 AM
    binary dependent variable, linear probability model
    • Replies: 0
    • Views: 2,231
    10-12-2013, 11:34 AM Go to last post
  51. mean and variance of a beta distribution

    I'm trying to do point (b) of exercise 3.30 of the book "Statistical Inference" (Casella & Berger). The exercise says: "Use the identities of...

    Started by Kiuhnm‎, 10-11-2013 11:02 AM
    beta distribution, exponential family
    • Replies: 2
    • Views: 5,094
    10-12-2013, 09:53 AM Go to last post
  52. Difference between probability of an individual and of a population?

    Im a little confused as to finding the probability of an individual to a population. My answers don't look correct. Could anyone help me out? A...

    Started by mahouyuki‎, 10-11-2013 10:45 PM
    • Replies: 1
    • Views: 2,281
    10-12-2013, 12:27 AM Go to last post
  53. Probability

    The Honolulu Advertiser stated that in Honolulu there was an average of 659 burglaries per 300,000 households in a given year. In the Kohola Drive...

    Started by amywhitfield‎, 10-10-2013 09:18 PM
    • Replies: 1
    • Views: 4,210
    10-10-2013, 09:27 PM Go to last post
  54. Transformations and Distribution Function

    Hey guys, Consider the following short example of transformations. Let the joint density of x\ \text{and}\ y be given by the unit square, i.e....

    Started by JohnK‎, 10-10-2013 01:20 PM
    • Replies: 2
    • Views: 2,146
    10-10-2013, 04:34 PM Go to last post
  55. The Gamblers Fallacy and Regression to the Mean

    Hi, so first time posting and all. I'm not a statistician by degree or trade (actually an engineer), so a little confused by something, and was...

    Started by Mr Ben‎, 11-16-2011 05:17 PM
    • Replies: 5
    • Views: 9,645
    10-10-2013, 02:27 PM Go to last post
  56. Distribution of variance

    Hello, I need help on a particular issue: I have performed a number of replicate experiments to determine the variance of my setup. None of the...

    Started by elpollodiablo‎, 10-09-2013 06:41 AM
    • Replies: 1
    • Views: 1,585
    10-10-2013, 05:12 AM Go to last post
  57. Moments of Burr Distribution(tricky)

    Hi all, consider the following problem: For the Burr Distribution given by: \displaystyle g(y)=\frac{abty^{t-1}}{(1+by^t )^{a+1}}\ \text{for}\...

    Started by JohnK‎, 10-09-2013 03:14 PM
    • Replies: 2
    • Views: 2,529
    10-10-2013, 04:49 AM Go to last post
  58. Resultant distribution

    HI, H is a random variable with distribution of CN(0,1) , and X is (+or-) a with probability of 0.5 each. I need the distribution of HX,...

    Started by Srik‎, 10-09-2013 01:12 AM
    • Replies: 0
    • Views: 1,921
    10-09-2013, 01:12 AM Go to last post
  59. How to find the probability of a podium finish

    Say in a race there are 22 competitors and say that the probability of driver A of winning the race is 55%. How can one calculate the probability of...

    Started by christian.falzom‎, 10-08-2013 03:43 PM
    • Replies: 5
    • Views: 2,381
    10-08-2013, 10:57 PM Go to last post
  60. Expected Value and Fair Value clarification (work already done)

    4. In the lottery game FANTASY 5 you have to select 5 numbers from the numbers {1,2,3,... ,38,39} for a jackpot of $40,000. Each ticket costs $1. In...

    Started by JohnWayne‎, 10-08-2013 04:54 PM
    • Replies: 2
    • Views: 2,575
    10-08-2013, 10:10 PM Go to last post

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