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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: 30,315
    09-30-2005, 09:44 AM Go to last post
  1. Any suggestions on how to figure out these two problems????

    Im getting frustrated because....I have been looking through my textbooks and notes trying to figure out how to set these two problems up...Can...

    Started by cdwhitak‎, 02-19-2012 05:44 PM
    • Replies: 1
    • Views: 4,656
    02-19-2012, 05:47 PM Go to last post
  2. Exclamation HELP! Please! Test on Monday!

    :eek: Need help with these two. Have tried and tried and tried. Q1 Recent developments appear to make it possible for couples to dramatically...

    Started by Gia0614‎, 04-02-2006 12:08 AM
    • Replies: 1
    • Views: 4,652
    04-03-2006, 09:01 AM Go to last post
  3. Homework Help - Balls in Urn problem (hypergeometric distribution?)

    Hi all, I need help with the following problem: The urn contains 5 black and 8 red balls. You close your eyes and remove balls from the urn...

    Started by dizzle1518‎, 04-26-2011 03:07 PM
    • Replies: 5
    • Views: 4,652
    04-29-2011, 10:18 AM Go to last post
  4. Combination or Permutation

    Please see the attached file. I obtained the answer by writing down the outcome sets. I wondered if they were correct. May I ask, how do we compute...

    Started by dEconomist‎, 12-29-2011 12:41 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,652
    12-31-2011, 08:56 AM Go to last post
  5. probability

    A congested computer network has a 0.002 probability of losinga data packet and packet losses are independent events. Alost packet must be resent....

    Started by amoeba88‎, 09-22-2013 01:21 AM
    • Replies: 1
    • Views: 4,652
    09-22-2013, 04:30 AM Go to last post
  6. probability of a machine failure at a certain hour of the day

    Hello folks. I look after some servers at work, one of which is intermittently failing. In the 38 days since I set up monitoring, there have been ten...

    Started by oregano‎, 11-01-2008 02:37 PM
    • Replies: 2
    • Views: 4,651
    11-02-2008, 12:49 PM Go to last post
  7. Selection w/o replacement, prob. of nth selected being mth of a set

    Here's the problem, and the solutions I've attempted and come up with: In a string of 12 christmas tree lights bulbs, 3 are defective. The bulbs...

    Started by omdown‎, 01-25-2009 09:02 PM
    • Replies: 1
    • Views: 4,648
    01-26-2009, 10:31 PM Go to last post
  8. Stochastic process, empirical CDF, probability for bound

    From what I understand, a stochastic process is a family of random variables, each of which follows some probability distribution. Now, let's...

    Started by luismarques‎, 12-25-2010 12:59 PM
    • Replies: 2
    • Views: 4,647
    01-07-2011, 12:56 PM Go to last post
  9. A combinations problem

    Hello everyone! Im only beginning to study statistics. The problem is easy, yet I need help :o A shelf contains 6 separate compartments. In how...

    Started by Olga‎, 12-26-2006 03:35 AM
    • Replies: 1
    • Views: 4,644
    01-11-2007, 05:58 PM Go to last post
  10. Homework problem, help me!

    Circuit boards are produced by a machine. Each board may turn out to be defective (Outcome D) with probability 0.1, good (Outcome D') with...

    Started by aimanR‎, 09-27-2010 06:10 PM
    • Replies: 4
    • Views: 4,641
    06-20-2012, 06:10 AM Go to last post
  11. Poll Poll: Let's Make a Deal....

    Monty Hall presents you with 3 doors. Behind one of the doors is a new car. Behind the other 2 doors, there's nothing. You make your choice of...

    Started by JohnM‎, 10-05-2005 02:51 PM
    • Replies: 2
    • Views: 4,639
    10-17-2005, 10:14 AM Go to last post
  12. Video game equipment

    Hello everyone, My friend has been playing this game called Tabula Rasa, and is trying to make the perfect armor for his character. In order to do...

    Started by chriscj‎, 05-14-2008 03:15 AM
    • Replies: 5
    • Views: 4,639
    05-30-2008, 12:00 AM Go to last post
  13. painted cubes

    How many different ways can 3 cubes be painted if each cube is painted one color and only the 3 colors red, blue, and green are available? (Order is...

    Started by dknight237‎, 07-30-2009 09:45 AM
    • Replies: 3
    • Views: 4,635
    07-30-2009, 02:49 PM Go to last post
  14. Difference between mean and expected value

    Could someone please explain as simply as possible the difference between mean and expected value? Here is my problem: This is for my math stats...

    Started by defrost‎, 12-06-2013 09:58 PM
    • Replies: 2
    • Views: 4,635
    12-07-2013, 11:06 AM Go to last post
  15. Credit Card Roulette - Expected Value

    4 people just finished dinner and the bill arrives. The total tab is $100. When paying for the bill what is better (for the individual): (1) split...

    Started by jmmcd‎, 06-16-2008 10:09 AM
    • Replies: 1
    • Views: 4,633
    06-16-2008, 04:08 PM Go to last post
  16. Conditional Probability

    What is the chance that the seventh card from the top of the deck will be a heart? This question really stumped me. I thought and then divided by...

    Started by Luis Felipe‎, 07-11-2010 10:31 AM
    • Replies: 5
    • Views: 4,633
    07-11-2010, 02:49 PM Go to last post
  17. Time Independent Poisson Regression

    Hi there, I'm new to all this and am looking for an explanation in Layman's Terms Level 1 (level 1 being your average primate.....level 10 being a...

    Started by CardiffCasual‎, 11-02-2012 12:02 PM
    • Replies: 5
    • Views: 4,633
    11-03-2012, 02:30 PM Go to last post
  18. Comparing CDFs using Chi squared?

    HI, I have a set of data from which I can construct the cumulative distribution function. I then compare this contructed CDF with the CDFs of a...

    Started by aler‎, 07-09-2008 11:45 AM
    • Replies: 3
    • Views: 4,632
    07-10-2008, 07:44 AM Go to last post
  19. Bayes' Theory

    Hi i'm currently working on a horse race prediction project and trying to include bayes' theory in my project. The thoery is new to me I am trying to...

    Started by flag3k‎, 04-17-2010 11:45 AM
    • Replies: 2
    • Views: 4,628
    04-19-2010, 03:21 AM Go to last post
  20. what is a log normal?

    Hi there, I have a question regarding the log normal and normal distribution. What I think is that if Y has a normal distribution then X=log(Y)...

    Started by leo nidas‎, 04-06-2010 04:29 AM
    • Replies: 2
    • Views: 4,627
    04-06-2010, 09:11 AM Go to last post
  21. Area under the sampling distribution curve

    Hi, Given a random sample size of n=10 (from a normal population) and a standard deviation of 5, how can I calculate the area under the sampling...

    Started by Silvanus‎, 08-24-2008 08:22 PM
    • Replies: 2
    • Views: 4,626
    08-25-2008, 04:11 PM Go to last post
  22. Question Small question in stochastic processes

    fair coin toss: X(t,H)=cos(t) if heads shows X(t,T)=sin(t) if tails shows Introduce a Bernoulli random variable B and express X(t) in terms of...

    Started by sajee3a‎, 11-09-2010 01:59 AM
    • Replies: 1
    • Views: 4,625
    11-09-2010, 03:26 AM Go to last post
  23. How do I calculate probability using excel?

    I have 8 weeks worth of fantasy football scores from 12 different teams in a MS excel spreadsheet. Each team plays a different team every week. Is it...

    Started by rocky980‎, 11-04-2011 11:56 AM
    • Replies: 3
    • Views: 4,624
    11-04-2011, 12:17 PM Go to last post
  24. Help!!

    In a recent survey about appliance ownership, 58% of the respondents indicated that they own Maytag appliances, while 24% indicated they own GE...

    Started by lonerider‎, 10-20-2012 11:30 PM
    • Replies: 5
    • Views: 4,623
    10-21-2012, 10:34 PM Go to last post
  25. Transformations

    Hi! Suppose X ~ U(0,1). If we let Y = -ln (x) and then find the density of Y, we get the exponential distribution (with rate parameter = 1). ...

    Started by jamesmartinn‎, 07-12-2010 12:01 AM
    • Replies: 4
    • Views: 4,621
    07-12-2010, 03:28 PM Go to last post
  26. Two Random Variables Normal Distribution

    X1 ~ N(3,2^2), X2 ~ N(-8, 5^2) Let U = X1 - 5X2 Let V = -6X1 + CX2, where C is constant. (a) What are the distributions of U and V? I know U ~...

    Started by simplemts‎, 10-19-2012 03:37 PM
    • Replies: 13
    • Views: 4,615
    10-19-2012, 11:00 PM Go to last post
  27. 3D Random Walk

    Okay, so I've got this random walk problem here: (a) Using an appropriate Dirac-delta function, find the probability density w(s) for...

    Started by Callmesomething‎, 04-11-2008 07:54 PM
    • Replies: 1
    • Views: 4,614
    04-12-2008, 11:32 PM Go to last post
  28. how many degrees of freedom do I need to make a Root Sum Square valid?

    If I have two errors, that seems on the low end for using RSS. If I have a hundred, I feel pretty comfortable. I'm having trouble finding math...

    Started by cloughna‎, 01-17-2011 03:43 PM
    • Replies: 0
    • Views: 4,606
    01-17-2011, 03:43 PM Go to last post
  29. independence proof

    Hi, I got this problem about event independence, Let A, B, C are independent, prove or disprove that A U B and C are indepent. I tried to...

    Started by xguo‎, 07-01-2009 10:46 PM
    • Replies: 2
    • Views: 4,605
    07-01-2009, 11:34 PM Go to last post
  30. 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: 4,604
    02-26-2014, 12:24 AM Go to last post
  31. Hi I need help w/ sampling distribution.

    HI, I'm taking statistics and i was trying to solve a problem, but I couldn't solve it. I was wondering if you could help me out. Here's the...

    Started by Michelle‎, 11-11-2005 05:19 PM
    • Replies: 4
    • Views: 4,599
    11-11-2005, 07:49 PM Go to last post
  32. Probability Question- Positive/Negative Disease

    One percent of all individuals in a certain population are carriers of a particular disease. A diagnostic test for this disease has a 97 % detection...

    Started by Lley‎, 10-10-2012 08:18 PM
    • Replies: 4
    • Views: 4,591
    10-10-2012, 11:58 PM Go to last post
  33. Indicated probability

    I need help with this. I have tried this every way I know possible. I know the answer, but can't find out how I actually get it. An airline...

    Started by Michimom0405‎, 07-05-2009 09:28 AM
    • Replies: 1
    • Views: 4,586
    07-05-2009, 10:47 AM Go to last post
  34. Bernoulli / Geometric Distribution Question

    This is a question that is on a study-guide for a test I have coming up, and I'm completely lost. I was sick when we covered Bernoulli's experiments...

    Started by porcelain.parachutes‎, 11-17-2010 12:15 AM
    • Replies: 1
    • Views: 4,586
    11-17-2010, 01:15 AM Go to last post
  35. Confused on total probability formula

    I am very confused on how to apply the total probability formula. If X and Y are two independent continuous random variables with pdfs g(x) and...

    Started by Troopers04‎, 09-10-2009 09:19 AM
    • Replies: 2
    • Views: 4,584
    09-10-2009, 12:08 PM Go to last post
  36. what's the probability that x^2+bx+c=0 has real root?

    can any one answer this one?

    Started by tennis89‎, 07-19-2010 09:10 PM
    • Replies: 3
    • Views: 4,582
    07-20-2010, 05:47 AM Go to last post
  37. binomial distribuion problem

    Estimate the indicted probability by using the normal distribution as an approximation to the binomial distribution. In one county, the conviction...

    Started by jewsvideo‎, 05-14-2009 04:53 AM
    • Replies: 0
    • Views: 4,578
    05-14-2009, 04:53 AM Go to last post
  38. help with this problem

    someone explain the answer of this question ...i have the answers but i want to know the formulas ... An assembly consists of three mechanical...

    Started by zerofreeze‎, 01-18-2008 02:40 PM
    • Replies: 0
    • Views: 4,575
    01-18-2008, 02:40 PM Go to last post
  39. need help understanding interview question

    Hello folks, I had a weird question which I am confused about. I was wondering if you anyone could help me or point me in the right direction (ie....

    Started by r4qx‎, 06-22-2013 06:38 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,575
    06-24-2013, 12:41 PM Go to last post
  40. P value probabilites by hand/T chart

    Thank you for taking the time to read my query. I appreciate it. I moved my query from statistics to probability because I really didn't get an...

    Started by ealeql‎, 11-02-2010 01:59 PM
    • Replies: 0
    • Views: 4,571
    11-02-2010, 01:59 PM Go to last post
  41. Probability dealing with sample proportion

    I know how to compute the sample mean but I have a problem dealing with sample proportion. The problem is compute the probability that another...

    Started by tiffnnie01‎, 10-16-2008 11:49 AM
    • Replies: 1
    • Views: 4,569
    10-16-2008, 01:06 PM Go to last post
  42. Axioms of probability and sigma additivity

    The third axiom of probability states that given an infinite sequence of mutually exclusive events A1, A2, .... we have P(A1 U A2 U ...) = P(A1) +...

    Started by Weiss‎, 01-27-2017 10:05 PM
    additivity, axiom, measure
    • Replies: 6
    • Views: 4,565
    02-03-2017, 04:06 PM Go to last post
  43. Some Help

    Please. I think I am having a mental cramp right now. I want to know when are the times you subtract 1-so and so? The examples are below. Mean...

    Started by PSG‎, 10-02-2012 11:34 PM
    • Replies: 1
    • Views: 4,563
    10-03-2012, 09:14 PM Go to last post
  44. 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: 4,562
    11-12-2009, 08:11 PM Go to last post
  45. Cumulative combinations

    I wish to determine the probability of a team winning AT LEAST eight of its next ten games. I understand that 10C8 will tell me the probability of...

    Started by johnnic‎, 07-04-2010 04:55 AM
    • Replies: 5
    • Views: 4,562
    07-04-2010, 10:12 AM Go to last post
  46. PDF & CDF Integration! Please help!!

    Hi everyone, I haven't done integration in a long time, so I just need someone to verify if my calculation is right. The question is: ...

    Started by ankitj‎, 08-10-2009 06:52 AM
    • Replies: 2
    • Views: 4,557
    08-10-2009, 09:31 AM Go to last post
  47. help

    I am having a difficult time understanding probability. Here are some questions I am trying to figure out. 1.) Several students are unprepared for...

    Started by JELEWIS01‎, 08-16-2007 05:50 PM
    • Replies: 1
    • Views: 4,550
    08-17-2007, 08:06 AM Go to last post
  48. simulating correlated, non-normal data: WHY DOES THIS HAPPEN!?

    i have been experimenting with different methods to generate correlated, non-normal data for comprehensive-exam purposes and i'm finding something i...

    Started by spunky‎, 09-21-2014 04:53 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,548
    09-21-2014, 08:59 PM Go to last post
  49. Statistics HEEELLPPP!!

    A lot of 1000 components contains 250 that are defective. Two components are drawn at random and tested. Let A be the event that the first component...

    Started by Kcgiggles‎, 02-24-2015 10:02 PM
    • Replies: 1
    • Views: 4,548
    02-24-2015, 11:14 PM Go to last post
  50. Exclamation Please Help! I am really stuck on some problems....

    During the past forty years, the monthly rate of return of stocks has been approximately normally distrubuted, with u=0.75 percent and sigma=4.2...

    Started by Fashion7‎, 11-11-2005 10:47 PM
    • Replies: 10
    • Views: 4,546
    11-14-2005, 11:34 AM Go to last post
  51. Probability of Word within Word

    Hello! I'm in dire need of help as I've been working on this for a couple days now. I've been to the help center around school and have had three...

    Started by Abbott54‎, 04-16-2008 11:20 AM
    • Replies: 2
    • Views: 4,545
    04-16-2008, 11:04 PM Go to last post
  52. 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: 4,545
    09-02-2010, 08:48 AM Go to last post
  53. X=0 almost surely => E(X)=0

    Axioms of expectation: 1. X>0 => E(X)>0 2. E(1)=1 3. E(aX+bY) = aE(X) + bE(Y) 4. If X_n is a nondecreasing sequence of numbers and lim(X_n) = X,...

    Started by kingwinner‎, 07-07-2009 10:05 PM
    • Replies: 14
    • Views: 4,541
    07-20-2009, 12:59 AM Go to last post
  54. Probability help needed

    Each state of the 50 in the US has two senators. What is the probability that in a random committee of 50 senators (a) Maryland is represented (b)...

    Started by Zennie‎, 09-28-2010 09:55 PM
    • Replies: 1
    • Views: 4,540
    09-28-2010, 11:39 PM Go to last post
  55. 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: 4,534
    12-23-2013, 11:22 AM Go to last post
  56. how to get probability from a normal distribution?

    If I had Z=Y^3 where Y is a standard normal distribution. How would I approx. calculate the probability of Z<=1 ?, I would understand it if it was...

    Started by omega‎, 11-25-2010 01:52 PM
    • Replies: 4
    • Views: 4,532
    11-25-2010, 09:18 PM Go to last post
  57. 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: 4,530
    12-03-2010, 06:28 PM Go to last post
  58. Probability integral transformation

    Hey I've got a probably simple question concerning time series analysis but I don't know what I should do::( I did a in-sample estimation of...

    Started by riddy‎, 05-09-2009 08:58 AM
    • Replies: 0
    • Views: 4,529
    05-09-2009, 08:58 AM Go to last post
  59. Simplified Inventory Problem

    Hello, I'm having trouble with the following problem. Suppose that it costs c dollars to stock an item and that the item sells for s dollars....

    Started by TheDaezy‎, 10-31-2012 07:58 PM
    • Replies: 1
    • Views: 4,529
    11-01-2012, 02:57 AM Go to last post
  60. question about likelihood function/MLE

    If a random variable Y has the following probability distribution: P (Y = 1) = p, P (Y = 2) = q, and P (Y = 3) = 1−p−q. A random sample of size n...

    Started by messianic‎, 08-04-2010 09:05 PM
    • Replies: 6
    • Views: 4,527
    08-06-2010, 10:25 AM Go to last post

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