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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: 30,331
    09-30-2005, 09:44 AM Go to last post
  1. finding p-value from chi square freedom

    For example, estimated p-value from chi-square table with 1 d.f is 0.1 < p < 0.9. Can anyone tell me how we get this range? aka. can anyone help me...

    Started by hanelliot‎, 02-22-2010 11:23 PM
    • Replies: 1
    • Views: 9,039
    02-23-2010, 02:42 AM Go to last post
  2. Cup and ball game: what are the odds of that?

    OK we are having an intelectual discussion (no, really) about the change in odds during the classic cup and ball game. To explain: a dealer has...

    Started by bonedoctor‎, 02-22-2010 06:27 PM
    • Replies: 2
    • Views: 12,605
    02-22-2010, 08:00 PM Go to last post
  3. More issues with probability distribution

    Now I have to construct a probability distribution table from the following information: There are six pencils for sale and two are defective. If...

    Started by jakedowdy‎, 02-21-2010 11:48 PM
    • Replies: 2
    • Views: 3,112
    02-22-2010, 03:19 PM Go to last post
  4. Probability Distribution question

    Homework question involving number of defects found in a randomly selected factory item. if X is the number of defects found, and the probability...

    Started by jakedowdy‎, 02-21-2010 11:36 PM
    • Replies: 1
    • Views: 4,067
    02-22-2010, 01:32 PM Go to last post
  5. probability, joint density

    Hi - I'm stuck on a step in the following example taken from a textbook (survival analysis by Klein): I'm familiar with evaluating...

    Started by winds‎, 02-21-2010 01:01 AM
    • Replies: 2
    • Views: 2,792
    02-21-2010, 05:24 PM Go to last post
  6. Joint Density Function Question

    So (fy1,fy2) = e^-(y1 + y2) ) , for y1>0, y2>0 and 0 elsewhere. What is P(Y1 + Y2 < 3) The answer is .8009 I just can't work out how to get...

    Started by OToole‎, 02-21-2010 04:48 AM
    • Replies: 4
    • Views: 7,443
    02-21-2010, 08:52 AM Go to last post
  7. This is kind of embarrassing

    QUESTION What is the probability TODAY that over the next ten years that "EVENT X" will occur based on the following criteria. *There is a 50%...

    Started by jamestampa‎, 02-19-2010 04:00 PM
    • Replies: 3
    • Views: 2,418
    02-21-2010, 12:05 AM Go to last post
  8. probability question independence

    Hi there, Everything is positive: Let the r.v. T=min(X,C), and the r.v. Y. Let also D=1, if X<C, 0 otherwise. (X,C,Y,T continuous). I.e. the...

    Started by leo nidas‎, 02-20-2010 10:52 AM
    • Replies: 1
    • Views: 2,480
    02-20-2010, 11:56 AM Go to last post
  9. distribution of the range of N independent standard normal variables

    Let x1, x2, ... xn be independent standard normal variables. (standard normal: normal with 0 mean and variance 1). Let the range R be defined as...

    Started by AndyMC‎, 02-19-2010 08:49 AM
    • Replies: 4
    • Views: 7,445
    02-20-2010, 01:07 AM Go to last post
  10. Considerations in taking on a one-time gamble

    Assuming I'm risk-neutral, how are they different from taking on repeated gambles?

    Started by Outlier‎, 02-18-2010 04:10 PM
    • Replies: 0
    • Views: 2,958
    02-18-2010, 04:10 PM Go to last post
  11. Odds of birthday on same day

    I'm confused about the following... Two people have their birthday on a specific day of the year. Are the odds 1:365 or 1:730 ? :confused: ...

    Started by MrConfused‎, 02-17-2010 06:08 PM
    • Replies: 7
    • Views: 12,508
    02-18-2010, 04:09 PM Go to last post
  12. Random Samples

    I cannot figure out how we come to the answer of 3,921,225 for this question. Out of a 100 numbers I need to take a random sample of four numbers. ...

    Started by roda‎, 02-18-2010 10:44 AM
    • Replies: 1
    • Views: 3,830
    02-18-2010, 02:02 PM Go to last post
  13. Poisson tricky problem

    Suppose that N individuals have a certain gain "a" at t0 and that each of them at any point in time participate to an independent lottery which...

    Started by alamorge‎, 02-18-2010 01:14 PM
    • Replies: 0
    • Views: 2,644
    02-18-2010, 01:14 PM Go to last post
  14. Gamma Probability (really an area of a circle question)

    The question reads: Explosive Devices used in mining operations produce nearly circular craters when detonated. The radii of these craters are...

    Started by OToole‎, 02-18-2010 07:43 AM
    • Replies: 1
    • Views: 7,472
    02-18-2010, 09:20 AM Go to last post
  15. Poisson distribution question

    hi guys, I seem to forgot how it's done, a little help will be appreciated ! the number of accidents in a factory have the Poisson distribution...

    Started by WeeG‎, 02-17-2010 11:03 AM
    • Replies: 2
    • Views: 3,546
    02-17-2010, 04:04 PM Go to last post
  16. Ratio of uniforms is Cauchy

    Hi all! I have U is uniform(0,1) and V is uniform(-1,1) such that U^2 + V^2 <= 1. Furthermore, let X=V/U. Show that X is Cauchy. I tried to...

    Started by JennySton‎, 02-16-2010 07:40 PM
    • Replies: 4
    • Views: 4,298
    02-17-2010, 02:21 PM Go to last post
  17. Quick question on marginal distributions

    Hi, I'm trying to figure out a marginal distribution for a joint probability function. My question is - what do I use as my limits of integration? ...

    Started by mrzpn1‎, 02-16-2010 06:41 PM
    • Replies: 2
    • Views: 2,946
    02-16-2010, 08:58 PM Go to last post
  18. how many times would you expect to see a sequence "the" in a text

    If every letter in an English text would have equal probability to occur, and if every combination of letters would be equally likely, how many times...

    Started by xiaoc10‎, 02-15-2010 11:53 PM
    • Replies: 1
    • Views: 2,815
    02-16-2010, 05:27 AM Go to last post
  19. Simulated Annealing (Cooling Too Fast)

    How do you prove something cools "too fast"? Here is the full question: For simulated annealing, some temperature schedules decrease...

    Started by sweetpotatofry‎, 02-16-2010 02:26 AM
    • Replies: 0
    • Views: 3,305
    02-16-2010, 02:26 AM Go to last post
  20. prob question

    There are 9 people in group A, 4 people in group B and 2 people in group C. 6 of them will win a ticket. 1. what is the probability that all the...

    Started by WeeG‎, 02-15-2010 10:21 AM
    • Replies: 1
    • Views: 2,341
    02-15-2010, 01:29 PM Go to last post
  21. Benford's Law and U.S. States

    Can Benford's law apply to the population of the 50 U.S. states? Is the sample size adequate to make this work? If so, what does it show? Curious...

    Started by jerseydan‎, 02-12-2010 11:16 PM
    • Replies: 1
    • Views: 2,955
    02-13-2010, 12:00 AM Go to last post
  22. Odds question

    A newspaper article preceeding the 1994 World Cup semifinal match between Italy and Bulgaria stated that "Itality is favored 10-11 to beat Bulgaria,...

    Started by jamesmartinn‎, 02-12-2010 01:05 AM
    • Replies: 2
    • Views: 4,387
    02-12-2010, 06:05 PM Go to last post
  23. Fairly Easy Question - Poisson Distribution

    My first post! Anyway I just need a bit of help with a question that I've come across in a textbook which is as follows: Cars arrive at a toll...

    Started by OToole‎, 02-11-2010 02:50 AM
    • Replies: 5
    • Views: 7,456
    02-11-2010, 10:48 PM Go to last post
  24. Markov Chains & Flux

    Hi, I have a question about Markov Chains: Consider a partition of the state space S of a Markov chain into two complementary subsets A and Ac....

    Started by sweetpotatofry‎, 02-11-2010 04:50 PM
    • Replies: 1
    • Views: 2,833
    02-11-2010, 07:36 PM Go to last post
  25. Poker probability question

    This is probably a simple enough problem, however its been 10 years since I was in a statistics class, so I am clueless. Any help is appreciated. ...

    Started by GetScrilla‎, 02-10-2010 03:49 PM
    • Replies: 1
    • Views: 2,256
    02-11-2010, 12:20 AM Go to last post
  26. Question about probability - roulette wheel

    Hi there, Have a question about the topic above. I spin a roulette wheel and wait until 31 of the 37 numbers have come up. I then cover the...

    Started by dhanwell‎, 02-09-2010 10:49 AM
    • Replies: 6
    • Views: 5,200
    02-09-2010, 01:23 PM Go to last post
  27. Forgot how to calculate!

    1. CNAE, an all-news AM radio station, finds that the distribution of the lengths of time listeners are tuned to the station follows normal...

    Started by statstobegin‎, 02-08-2010 07:52 PM
    • Replies: 0
    • Views: 1,946
    02-08-2010, 07:52 PM Go to last post
  28. A conditional Pobability Problem

    Please see the attached plot to understand clearly the problem I am struggling with a conditional probability problem, i would appreciate if...

    Started by TIMO‎, 02-05-2010 01:54 PM
    • Replies: 2
    • Views: 2,927
    02-08-2010, 09:16 AM Go to last post
  29. Transformation of univariate random variables

    Hi all, I need help with two problems: Problem1: Let U and V be iid Uniform(-1,1). Furthermore, let W=U^2 + V^2 and Z = U / sqrt(W). What is...

    Started by JennySton‎, 02-07-2010 07:38 PM
    • Replies: 3
    • Views: 6,375
    02-08-2010, 08:42 AM Go to last post
  30. Random walk and Central limit theorem

    (Random Walk) A stock has the value of 100 on day 0. Each day, the value changes randomly either one unit upwards with probability 2/3 or two units...

    Started by JackSwan‎, 02-08-2010 04:16 AM
    • Replies: 2
    • Views: 4,076
    02-08-2010, 06:30 AM Go to last post
  31. Method of Moments, MLEs, and Standard Errors

    Hi, I have a question about standard errors in the context of this problem. Any help would be greatly appreciated: Suppose X is a discrete random...

    Started by sweetpotatofry‎, 02-05-2010 01:13 PM
    • Replies: 13
    • Views: 14,034
    02-07-2010, 04:13 PM Go to last post
  32. Bayes Problem

    A diagnostic test is designed to detect whether subjects have a certain disease. A positive test outcome predicts that a subject has the disease....

    Started by jamesmartinn‎, 02-04-2010 10:19 PM
    • Replies: 2
    • Views: 3,865
    02-06-2010, 11:08 AM Go to last post
  33. Facebook Probability Question

    This seems like a straightforward problem, but I can’t seem to wrap my head around it. Maybe tomorrow after a little more sleep! In short, I’m...

    Started by bigjohn1947‎, 02-05-2010 04:54 PM
    • Replies: 0
    • Views: 2,198
    02-05-2010, 04:54 PM Go to last post
  34. probability problem

    can anyone help me with this problem? a boy finds that he can climb to a height of at least 1.85m once in five attempts, and to a height of at...

    Started by gorilla17‎, 02-03-2010 02:55 PM
    • Replies: 8
    • Views: 3,256
    02-03-2010, 09:54 PM Go to last post
  35. Probability of an Event

    There is probably a very simple answer to this, but please help a stats novice. I am trying to determine the probability of an event occurring in...

    Started by jwindebank‎, 02-02-2010 08:52 PM
    • Replies: 12
    • Views: 9,329
    02-03-2010, 09:00 PM Go to last post
  36. Statistics newb with poker questions

    Let's say I have a dozen variables for tens of thousands of players and I'm trying to figure out the formula using a symbolic regression program for...

    Started by barbiedoll‎, 02-02-2010 07:19 PM
    • Replies: 8
    • Views: 4,007
    02-03-2010, 04:59 PM Go to last post
  37. Probability, binominal distribution

    A hotel manager knows that approximately 5 % of the reservations are so called “no-shows” – people who have made a reservation, but do not arrive...

    Started by JackSwan‎, 02-02-2010 12:15 PM
    • Replies: 6
    • Views: 8,031
    02-03-2010, 03:22 AM Go to last post
  38. Question Yes/No Survey mean?

    This is the questions I know how to do it but I dont know how I would figure out the mean for this, which is needed to find the confidence level. ...

    Started by rajuthan‎, 11-04-2009 12:03 AM
    • Replies: 5
    • Views: 11,830
    02-03-2010, 12:44 AM Go to last post
  39. Expected value and Standard deviation of 2 alternatives

    Hi! I'm glad I found this great forum! I really hope to be of use myself and help answer some easier questions. In the meantime, could somebody...

    Started by Jeremy87‎, 02-02-2010 05:02 PM
    • Replies: 1
    • Views: 9,528
    02-02-2010, 06:22 PM Go to last post
  40. Exploratory Factor Analysis

    Hi All: I'm doing an EFA study. Here are the specifics: - A battery of 9 questionnaires - Using iterated principal axis factoring as my...

    Started by jamesmartinn‎, 02-01-2010 07:06 PM
    • Replies: 0
    • Views: 2,911
    02-01-2010, 07:06 PM Go to last post
  41. Probablilty binomial distribution

    Keeping in mind that this is an excerpt from a novel, let us examine the probability, 0.7980, of a successful jump. If you were one of the l2-member...

    Started by jammy006‎, 02-01-2010 09:13 AM
    • Replies: 7
    • Views: 4,063
    02-01-2010, 03:40 PM Go to last post
  42. Normal R.V. (z) multiplied by a function of z

    it is found in one of the papers I've read recently and written: z ~ N(m,v) and f(z) is just any function of z then E(exp(z)*f(z)) =...

    Started by loooooo‎, 01-29-2010 08:39 AM
    • Replies: 6
    • Views: 3,340
    02-01-2010, 06:09 AM Go to last post
  43. Smile Probablilty binomial distribution

    Keeping in mind that this is an excerpt from a novel, let us examine the probability, 0.7980, of a successful jump. If you were one of the l2-member...

    Started by jammy006‎, 02-01-2010 01:18 AM
    • Replies: 1
    • Views: 2,858
    02-01-2010, 01:20 AM Go to last post
  44. Correlating time series data between sources

    I have data from a remote environmental station, collected hourly over a period of months. Extreme outliers indicated periodic bad data and so the...

    Started by SlideRule‎, 01-31-2010 03:00 PM
    • Replies: 1
    • Views: 2,855
    01-31-2010, 09:37 PM Go to last post
  45. Unhappy Probability distribution of independent variable

    Hello people, i m stuck at this question:(:(: Two players A and B are playing in the final of a table-tennis tournament in which the player who...

    Started by etjh‎, 01-30-2010 02:17 AM
    • Replies: 1
    • Views: 2,854
    01-30-2010, 09:09 AM Go to last post
  46. Number in a group having birthday coincidence probability<0.5

    Hello, Considering 365 days in a year and uniform distribution of birthdays throughout the year, I want to find out the number of people (among N)...

    Started by mnhuda‎, 01-29-2010 10:11 PM
    • Replies: 2
    • Views: 3,884
    01-30-2010, 12:07 AM Go to last post
  47. cluster

    Hi there, Suppose I have some variables (among others of several types) measured in likert scale and need to cluster my data according to these...

    Started by leo nidas‎, 01-29-2010 08:15 PM
    • Replies: 1
    • Views: 2,925
    01-29-2010, 10:17 PM Go to last post
  48. Question probability problem

    Let, X is a random variable with MGF = exp{ 3t + 8t^2}. then P ( -4.84 < X < 9.6) = ? (A) equal to 0.700 (B) equal to 0.925 (C) equal to 0.975...

    Started by Sambit‎, 01-26-2010 10:48 AM
    • Replies: 7
    • Views: 3,219
    01-27-2010, 07:51 PM Go to last post
  49. best forecast

    hi, i have been solving this question and my result is different than the results i have been given to compare to. can u please tell me if i am...

    Started by zhenyazh‎, 01-24-2010 04:26 AM
    • Replies: 1
    • Views: 3,238
    01-27-2010, 08:53 AM Go to last post
  50. Probability of a Sample Mean between two numbers

    I am having troubles with a problem that requires me to find the probability of a sample mean between two numbers. I am given the mean and the SD,...

    Started by jtingle‎, 01-25-2010 09:46 PM
    • Replies: 0
    • Views: 8,989
    01-25-2010, 09:46 PM Go to last post
  51. Can't reconcile probability information

    Hello there! I'm doing a review course in probability that I thought would be trivial. By and large, I'm not having any difficulty, but one...

    Started by alexandicity‎, 01-23-2010 08:30 PM
    • Replies: 2
    • Views: 2,413
    01-25-2010, 02:41 PM Go to last post
  52. forecast and fine

    hi, am i solving it right? a coin is flipped twice with probability of 2/3 for heads. you are supposed to forecast the number of heads with fine...

    Started by zhenyazh‎, 01-24-2010 04:48 AM
    • Replies: 1
    • Views: 2,832
    01-24-2010, 02:07 PM Go to last post
  53. even and odd probability of coin

    hi, i am preparing for an exam and i wondered if some one could show me explicitly how to calculate the probability of getting an even number of...

    Started by zhenyazh‎, 01-24-2010 06:51 AM
    • Replies: 1
    • Views: 5,322
    01-24-2010, 08:02 AM Go to last post
  54. correlation coefficient

    hi another exam preparation question: let x1..xn be random varibale independent and with same dist. they have exp. u and variance v. let m be a...

    Started by zhenyazh‎, 01-24-2010 07:12 AM
    • Replies: 2
    • Views: 5,340
    01-24-2010, 07:49 AM Go to last post
  55. variable dependency check

    hi, i am a bit confused. i know how to check if two variables are not correlated. but how do i check they are independent? for instance i have...

    Started by zhenyazh‎, 01-24-2010 04:32 AM
    • Replies: 0
    • Views: 2,437
    01-24-2010, 04:32 AM Go to last post
  56. problem with convergance of probability

    hi, this is a simple on but some how i get a result different from what the professor got. i guess i am wrong but i dont know why. i need to find...

    Started by zhenyazh‎, 01-23-2010 03:20 AM
    • Replies: 3
    • Views: 2,807
    01-24-2010, 04:19 AM Go to last post
  57. Question Help

    Pregnant women are screened for brith defect for Down syndrome. probability of baby has down syndrome are listed AGE Probability of down...

    Started by pride90‎, 01-21-2010 06:02 PM
    • Replies: 0
    • Views: 2,073
    01-21-2010, 06:02 PM Go to last post
  58. How do you multiply a probability times a probability?

    Just a non-math guy needing help from some math guys so I can finish an article for a magazine! I know it's easy to do, I just don't know how. ...

    Started by cpaavola‎, 01-19-2010 09:38 PM
    • Replies: 10
    • Views: 5,347
    01-20-2010, 01:05 PM Go to last post
  59. Symmetric distribution

    Hi everyone! I am trying to understand the solution of a problem. "It says that x has a symmetric distribution, so that E=0, where mu=E". Now,...

    Started by rravina‎, 01-19-2010 03:10 PM
    • Replies: 2
    • Views: 5,103
    01-19-2010, 09:33 PM Go to last post
  60. probability of failure in a multi-component system

    I want to calculate the failure rate of a system that has multiple independent points of failure. If any one of these intermediate points fail then...

    Started by sbarefoo‎, 01-15-2010 08:44 AM
    • Replies: 2
    • Views: 16,642
    01-19-2010, 10:09 AM Go to last post

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