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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: 30,170
    09-30-2005, 09:44 AM Go to last post
  1. Random walk on a clock

    Consider the numbers 1, 2,..., 12 written around a ring as they usually are on a clock. Consider a Markov chain that at any point jumps with equal...

    Started by Ego7894612‎, 09-05-2010 12:13 PM
    • Replies: 5
    • Views: 9,579
    09-05-2010, 10:22 PM Go to last post
  2. Unhappy Probability Question..urgent

    Can somebody help me by solving the below mentioned proble? A survey reports that 62% of callers to a help desk complain about the service if...

    Started by arun_899‎, 08-27-2010 05:08 AM
    • Replies: 5
    • Views: 3,488
    08-27-2010, 10:00 AM Go to last post
  3. these problems are due today..HELP

    a penny is tossed from a distance onto a large table ruled in 1 inch sqaures.the penny is 3/4 inch in diam.find: 1)probability that it will fall...

    Started by sajee3a‎, 09-14-2010 01:58 AM
    • Replies: 5
    • Views: 3,259
    09-14-2010, 01:30 PM Go to last post
  4. Need some help understanding probability theory.

    Hello, My probability course has just started and I have a little trouble in preparation for my first quiz tomorrow, understanding some concepts....

    Started by c2q‎, 09-19-2010 04:41 PM
    • Replies: 5
    • Views: 4,906
    09-19-2010, 10:02 PM Go to last post
  5. Probability Density Function and Cumulative Distribution Function

    Hi everybody, If anyone has experience working with probability density functions (pdf), please look these sample problems over and if you could,...

    Started by kookie‎, 09-26-2010 03:47 PM
    • Replies: 5
    • Views: 13,288
    09-27-2010, 06:34 AM Go to last post
  6. Help with probability..asap plz

    An entomologist is studying the effect of a chemical sex attractant (pheromone) on insects. Several insects are released at a site equidistant from...

    Started by ena‎, 09-27-2010 06:22 PM
    • Replies: 5
    • Views: 6,502
    10-01-2010, 05:30 AM Go to last post
  7. Probability Mass Function

    I am given that X follows the geometric distribution and asked to give the probability mass function for X^2. I know that the probability mass...

    Started by math_guy314‎, 10-07-2010 08:38 AM
    • Replies: 5
    • Views: 4,943
    10-08-2010, 11:23 AM Go to last post
  8. NEED HELP with joint density problem

    Two RVs X & Y have the jiont density: f(x,y)=a, x^2+y^2<=1 Find the constant a. >>> HOW CAN I SOLVE THIS ???can i say that z=x^2+y^2

    Started by sajee3a‎, 10-07-2010 12:05 AM
    • Replies: 5
    • Views: 3,300
    10-08-2010, 12:48 AM Go to last post
  9. Probability density function

    I have a problem on one part of the four parts of this question. Here it is: The probability density function of the time customers arrive at a...

    Started by statsec‎, 10-08-2010 09:19 AM
    • Replies: 5
    • Views: 11,743
    10-08-2010, 03:00 PM Go to last post
  10. probability , confusing table

    I am really confused with the table , I am not sure if I am doing it right, Can you have a look at my answers? 3. In smoking related research,...

    Started by SadieKhan‎, 10-12-2010 12:51 PM
    • Replies: 5
    • Views: 2,654
    10-12-2010, 07:23 PM Go to last post
  11. Pretty Basic probability question

    Thanks guys. Figured it out!

    Started by TampaBuff‎, 10-14-2010 10:08 AM
    • Replies: 5
    • Views: 3,152
    10-14-2010, 11:09 AM Go to last post
  12. 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
  13. Question prob. questions

    Let we have 3 urns with a white, b black balls in each urn. We choose one ball from urn 1 and transform it to urn 2. Then, choose one ball from urn 2...

    Started by yuki‎, 10-20-2010 04:01 AM
    • Replies: 5
    • Views: 2,912
    10-20-2010, 05:01 PM Go to last post
  14. Angry help with beta distribution

    for this question How do i show that X1~Beta(a1,a2+a3) whats a hint to show this?

    Started by omega‎, 11-01-2010 09:20 PM
    • Replies: 5
    • Views: 4,230
    11-02-2010, 06:35 PM Go to last post
  15. Wink Propability with variable

    Hi , I need help with my statistics homework. I'm not realy good at statistics :shakehead more green. So will be very great to get some help.;)

    Started by Aauusteja‎, 11-02-2010 03:59 PM
    • Replies: 5
    • Views: 2,757
    11-03-2010, 03:09 PM Go to last post
  16. How can we prove a text is written by a human beign?

    A computer prints two papers, on the first paper is written, "ASDDSF DFGDF ERSDKUF DFD RRVFDSDA" on the second paper is written, "HOW ARE YOU...

    Started by dorood‎, 11-17-2010 11:24 PM
    • Replies: 5
    • Views: 4,594
    11-18-2010, 06:15 PM Go to last post
  17. help with chi square freedom sums

    How do i show that the a + is a ? How can i use moment generating functions to do this?

    Started by omega‎, 11-25-2010 02:43 PM
    • Replies: 5
    • Views: 5,197
    11-25-2010, 10:12 PM Go to last post
  18. Finding pdf of Quotient

    Let X ~ Uniform(0, 1) and Y ~ Exponential(1) be independent. Find pdf of X/Y For Y/X case, I understand that the pdf of this is integral of...

    Started by StatStudent3‎, 11-29-2010 08:58 PM
    • Replies: 5
    • Views: 3,036
    11-30-2010, 05:04 PM Go to last post
  19. Need a formula for a one of these gamma densities

    For the integral from for x^(s-1) * e^(-lambda * x) You have s and lambda, so is the final answer for this (s-1)! / lambda^(s) ? Or is it (s-1)!...

    Started by StatStudent3‎, 11-29-2010 10:10 PM
    • Replies: 5
    • Views: 3,673
    11-30-2010, 12:26 AM Go to last post
  20. Help with a hw question

    I am taking my first probability course and need some help. I am working on some homework. The question I am on now asks... Consider...

    Started by donkey‎, 12-01-2010 07:29 PM
    • Replies: 5
    • Views: 5,169
    12-04-2010, 12:51 PM Go to last post
  21. Moment Generate function

    Suppose we were to play a game with the following rules. We pay seven dollars to play the game. We then flip a (possibly biased, probability of heads...

    Started by thenumber5‎, 12-06-2010 03:18 PM
    • Replies: 5
    • Views: 4,615
    12-06-2010, 04:27 PM Go to last post
  22. Help with Probability!

    Hi. I came across a few questions tht i came across while studyin for a probability chapter. Just a little request, im very new to probability so u...

    Started by aisha00‎, 12-08-2010 06:02 AM
    • Replies: 5
    • Views: 18,835
    12-09-2010, 10:41 AM Go to last post
  23. Possion question

    Hey guys, i have my final next week and i been studying for it. i been doing the question in the book, but i there is a questions that i really do...

    Started by emland89‎, 12-10-2010 09:55 AM
    • Replies: 5
    • Views: 3,212
    12-10-2010, 10:13 PM Go to last post
  24. probability help

    Hi I am new to statistics and have been given the following question: Suppose X~B(16, 0.75) How do I calculate E(X) and V(X)? All the...

    Started by ccs‎, 12-13-2010 01:08 PM
    • Replies: 5
    • Views: 2,517
    12-13-2010, 01:59 PM Go to last post
  25. Geometric RV

    So i have a question... If X is a geometric RV with parameter p (the geometric definition where x=0,1,2,3...) 1. compute the distribution of...

    Started by ladyluck‎, 12-14-2010 01:04 AM
    • Replies: 5
    • Views: 6,664
    12-14-2010, 09:08 PM Go to last post
  26. Uniform Disk Help Grovel

    Let (x,y) be uniformly distributed over x^2+y^2\leq1, the unit disk. 1. Work out an expression for E{X^mY^n} I have found that the marginal...

    Started by donkey‎, 12-15-2010 01:54 AM
    • Replies: 5
    • Views: 3,550
    12-16-2010, 02:44 PM Go to last post
  27. 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
  28. Probability Question

    Hi Guys, I'm a novice at probability and would be very appreciative of some assistance with this question: If Company A (car manufacturer)...

    Started by Baseball Furies‎, 01-13-2011 06:01 PM
    • Replies: 5
    • Views: 3,883
    01-14-2011, 04:21 AM Go to last post
  29. What type of sampling is this....`

    First of all sorry if this is in the wrong section but i think is the section that applies most! I want to distrubute questionaires to five groups...

    Started by 98107‎, 03-04-2011 03:35 PM
    • Replies: 5
    • Views: 2,914
    03-08-2011, 11:23 PM Go to last post
  30. Roulette & interesting binomial question

    Hi everyone, Since I have some mathematical knowledge my friend asked me to help him out with a question with which I'm struggling: "On a...

    Started by steve695‎, 02-07-2011 10:19 AM
    • Replies: 5
    • Views: 5,335
    02-08-2011, 06:07 AM Go to last post
  31. Question probability problem

    For detecting a disease, a test gives correct diagnosis with probability 0.99. It is known that 1% of the population suffers from this disease. If a...

    Started by Sambit‎, 02-21-2011 11:36 AM
    • Replies: 5
    • Views: 5,849
    03-10-2011, 08:19 AM Go to last post
  32. Binomial Distribution Problem - How to interpret the given information

    Your company is running an audit on the Sleaze Company. Because Sleaze has a bad habit of issuing incorrect invoices, the focus of your audit is on...

    Started by raamaak‎, 02-27-2011 10:50 PM
    • Replies: 5
    • Views: 8,175
    10-04-2011, 01:58 PM Go to last post
  33. on the probability density function

    Good morning to all. I have a question: I have a data set X={x_1, x_2, ... , x_N} with probability density function P(x) (suppose continuous); if I...

    Started by StatLinux‎, 03-07-2011 06:02 AM
    dataset operation, density function
    • Replies: 5
    • Views: 3,973
    03-07-2011, 04:35 PM Go to last post
  34. Likelihood Ratio Test Statistic

    Hi guys, Heres my problem: ********** Data X1,X2,....,Xn, n = 20, are available of numbers of flaws per 10 metres of bales of a manufactured...

    Started by starlet‎, 03-07-2011 07:57 AM
    likelihood ratio test, poisson distribution, simple hypotheses
    • Replies: 5
    • Views: 10,529
    03-08-2011, 01:43 AM Go to last post
  35. looking for some help with my highschool homework

    hey everyone, sorry for the english i'm not a native. i'm was hoping to you could help me a little bit with a few homework assignments i have ...

    Started by dodovra‎, 03-07-2011 12:05 PM
    • Replies: 5
    • Views: 3,283
    03-07-2011, 03:05 PM Go to last post
  36. Given Joint Density Function

    f(x) { x(1+3y^2)/4 0<x<2, 0<y<1 0 otherwise 1. Find g(x), h(y) 2. Find f(x|y) 3.Evaluate P(1/4<x<1/2 | Y=1/3) in getting g(x) is this...

    Started by ARCHCOS‎, 03-09-2011 04:29 PM
    • Replies: 5
    • Views: 4,625
    03-10-2011, 04:10 PM Go to last post
  37. Probabilty : Round permutation problem

    A garland is to be formed with five roses and five dahlias. If they are arranged randomly, find the probability of roses and dahlias being arranged...

    Started by ak4su‎, 03-10-2011 07:51 AM
    • Replies: 5
    • Views: 4,811
    03-14-2011, 09:53 AM Go to last post
  38. normal approximation to binomial

    Hi Guys, I was solving a question and got wrong answer, don't know why... X~Bin(100,0.2) P(15<X<22) = ? I used the normal approximation: ...

    Started by WeeG‎, 03-12-2011 01:45 PM
    • Replies: 5
    • Views: 5,080
    03-13-2011, 04:54 AM Go to last post
  39. Conditional Probability

    Hello!!! Can anyone help me with this problem??...please!!! In relation to Equation P(A│B)=P(AB) / P(B) Show that: P(A│B)P(B)=P(B│A)P(A)

    Started by af_231‎, 03-14-2011 10:37 PM
    • Replies: 5
    • Views: 2,666
    03-20-2011, 09:12 PM Go to last post
  40. Conditional Expectation Problem

    Hi all I need to solve the following problem: If E(X|Y)=Y and E(Y|X)=X, prove that X=Y almost surely. Seems like I'll need to use the...

    Started by symmetry‎, 03-25-2011 10:18 PM
    • Replies: 5
    • Views: 4,697
    03-26-2011, 12:36 PM Go to last post
  41. Equation involving uniformly distributed variable

    Let U be a random variable uniformly distributed on , and let X be a dependent variable such that X^U = a for some number a (X^U means X to the power...

    Started by 1stone‎, 03-30-2011 08:30 PM
    • Replies: 5
    • Views: 3,059
    03-31-2011, 02:29 PM Go to last post
  42. Sum of uniform distribution

    I would be very grateful if anyone could help me with this problem! In a market simulation I have multiple shouts i.e. bids and asks for which I...

    Started by daniel23‎, 04-07-2011 11:28 AM
    • Replies: 5
    • Views: 5,946
    04-07-2011, 01:07 PM Go to last post
  43. Alternative to chi-squared test needed

    Hi all. I need a goodness of fit test for a situation in which a chi-squared test isn't appropriate - where the sum of the expected values does...

    Started by jdrbaldwin‎, 04-09-2011 05:23 AM
    alternative, bernoulli, chi-square, goodness of fit, sampling
    • Replies: 5
    • Views: 8,037
    04-15-2011, 05:23 PM Go to last post
  44. Uniform Probability Distribution

    The driving distance for the top 100 golfers on the PGA tour is between 284.7and 310.6 yards (Golfweek, March 29, 2003). Assume that the driving...

    Started by USMstudent85‎, 04-11-2011 09:51 AM
    • Replies: 5
    • Views: 19,829
    04-11-2011, 01:53 PM Go to last post
  45. Probability - Expectation of multiple exponentials

    Hi everybody, Your forum has been helpfull for some problems that I had in the past (they were already asked here), but now I have a question that...

    Started by BEX‎, 08-14-2011 02:41 PM
    • Replies: 5
    • Views: 3,628
    08-16-2011, 03:22 PM Go to last post
  46. 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: 4,627
    04-29-2011, 10:18 AM Go to last post
  47. Probability Help Please!

    A coin is tossed n times, where n is an odd number. Let X be the number of times heads show up in the n tosses. Define Y in terms of X as follows: if...

    Started by amazedmango‎, 05-07-2011 05:05 AM
    • Replies: 5
    • Views: 2,658
    05-09-2011, 11:55 AM Go to last post
  48. Question Conditional covariance

    X_i\sim Ber(\frac{1}{4}) and Y_i\sim Ber(\frac{3}{4}). Find Cov(\sum_{i=1}^{N} X_i,\sum_{i=1}^{N} Y_i) where P(N=k)=\frac{1}{2^k} for k=1,2,3,.... ...

    Started by Sambit‎, 05-13-2011 09:45 AM
    • Replies: 5
    • Views: 8,142
    05-15-2011, 10:09 AM Go to last post
  49. Probably of success for 3 mutually exclusive events

    I have been removed from the details of this since college over 20 years ago... Here is my question... For event A, probability of success is 30%...

    Started by zinzah‎, 05-17-2011 10:52 AM
    • Replies: 5
    • Views: 3,503
    05-17-2011, 12:56 PM Go to last post
  50. hi

    Let (X_n)_{n \geq 1} be a sequence of random variables such that E(X_n)>0 for all n. Is it straightforward for one to say that the series \sum_{n...

    Started by tzelios‎, 05-18-2011 08:26 AM
    • Replies: 5
    • Views: 2,515
    05-21-2011, 04:59 AM Go to last post
  51. Weighted coin probability

    The problem: A coin is weighted to show heads 60% of the time. How many coin tosses are needed to have 90% confidence of getting more heads than...

    Started by bob3690‎, 06-06-2011 06:05 AM
    • Replies: 5
    • Views: 5,422
    06-06-2011, 03:18 PM Go to last post
  52. Exclamation Tricky Poisson Formula Rearrangement

    Hello, I am currently doing some bus stop designs. I have not done statistics for a while but remember once doing poisson distributions at Uni. ...

    Started by PeterRose‎, 06-08-2011 01:13 AM
    poisson, probability, random
    • Replies: 5
    • Views: 3,801
    06-10-2011, 12:44 PM Go to last post
  53. Stuck on this

    The probability of an event happening is 20%. How many times would you have to do this to get an 80% chance of it happening at least 3 times?

    Started by ZachyT‎, 06-24-2011 12:22 PM
    • Replies: 5
    • Views: 2,262
    06-26-2011, 09:03 PM Go to last post
  54. A large and powerful corporation is extorting money from the public.

    When confronted with ****ing evidence the corporate CEO says these were rogue employees, these were anomalous cases, etc., etc., etc.. . . . ...

    Started by Outlier‎, 08-06-2011 04:00 PM
    • Replies: 5
    • Views: 2,403
    08-07-2011, 09:47 AM Go to last post
  55. Markov Chain

    A Markov chain X_{n},n\geq 0 with states 0, 1, 2 has the transition probability matrix If P(X_{0}=0)=P(X_{0}=1)=\frac{1}{4}, find E How do...

    Started by downthesun01‎, 08-08-2011 03:10 AM
    • Replies: 5
    • Views: 3,845
    08-09-2011, 12:58 AM Go to last post
  56. Same player winning the jackpot twice

    Hi Here in Sweden a scratch card buyer managed to buy two scratch cards with the top prize. The top prize is very rare so this caused some...

    Started by petersweden‎, 08-22-2011 02:09 PM
    • Replies: 5
    • Views: 2,973
    08-31-2011, 11:18 AM Go to last post
  57. Assessing goodness of fit across many variables in R in one session.

    Hi all I'm just getting started in R and would like some help with the following problem which could make life easier I hope! I have data set...

    Started by troot‎, 09-05-2011 01:18 AM
    • Replies: 5
    • Views: 1,946
    09-06-2011, 05:54 PM Go to last post
  58. Need some help with basic probability!

    Hey, I need some help with two probability question, and I would really appriciate all the help I can get! QUESTION 1: (a) A quality inspector...

    Started by madni‎, 09-14-2011 04:40 PM
    • Replies: 5
    • Views: 4,715
    09-16-2011, 03:43 AM Go to last post
  59. Gambling system significance

    I have a gambling system that I've been using on NFL games since November of 2009. So far there have been 128 plays and the record is 80 wins and 48...

    Started by Michael Isosceles‎, 09-14-2011 12:02 AM
    • Replies: 5
    • Views: 3,740
    09-14-2011, 03:42 PM Go to last post
  60. Probability problem

    Find the conditional probalilities of the indicated events when two fair dice (one red and one green) are rolled: The sum is 6, given that the...

    Started by Coral.ys‎, 10-02-2011 03:59 PM
    help me!, plese
    • Replies: 5
    • Views: 6,619
    10-02-2011, 05:12 PM Go to last post

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