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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: 30,265
    09-30-2005, 09:44 AM Go to last post
  1. Likelihood Theory

    Hi. I'm working with the exponential density f(x;theta) = theta * exp (-x*theta). I'm asked to verify the Var = -E. I've worked out the right...

    Started by jamesmartinn‎, 09-26-2011 09:52 PM
    • Replies: 3
    • Views: 3,447
    09-26-2011, 10:25 PM Go to last post
  2. Please help with this Hypothesis

    the annual profit for your organisation last year was $1203, per employee. The average for the sector was $1228 per employee. You need to know if...

    Started by S Adenrele Aderogba‎, 09-26-2011 02:35 PM
    • Replies: 0
    • Views: 2,494
    09-26-2011, 02:35 PM Go to last post
  3. Stuck on a (trivial) derivation for mixed effects linear models...

    i know this is horribly basic, but for some reason i'm not on top of my game now and cant work something very easy out. the general...

    Started by will22‎, 09-21-2011 02:30 PM
    • Replies: 4
    • Views: 2,726
    09-26-2011, 09:44 AM Go to last post
  4. Help with understanding this expected value proof

    can someone please explain this. My instructor did this but I don't really understand how. I have E(Y*E(YlX)) from theorem of total...

    Started by c2q‎, 09-25-2011 10:07 PM
    • Replies: 3
    • Views: 3,397
    09-26-2011, 04:06 AM Go to last post
  5. Hypergeometric distribution

    Sorry I could not delete it

    Started by Telet Ted‎, 09-25-2011 06:52 AM
    • Replies: 1
    • Views: 1,518
    09-25-2011, 08:16 AM Go to last post
  6. Darts probabilty

    when we throw a dart at a target, we have a probability of 1/4 of hitting the target . what is the probability of obtaining at least one hit if three...

    Started by Sajid Zaman‎, 09-25-2011 04:43 AM
    • Replies: 1
    • Views: 1,622
    09-25-2011, 07:49 AM Go to last post
  7. Exclamation Distribution Doubts !

    For this question, Find the probability that the 5th toss is a head. The answer is 1/2 because it's independent. Previous 4 tosses will not...

    Started by Stupid Idiot‎, 09-24-2011 12:17 PM
    • Replies: 1
    • Views: 1,714
    09-24-2011, 01:04 PM Go to last post
  8. Unhappy Conditional Probability (Please help me, I don't know how to continue from here.)

    Find the probabilities of getting (a) three 3's and then a 4 or 5 in four rolls of a balanced die. P(three 3's) = P(3rd is a three | 2nd is a...

    Started by Stupid Idiot‎, 09-24-2011 11:09 AM
    • Replies: 2
    • Views: 2,627
    09-24-2011, 12:02 PM Go to last post
  9. Card Probability Problem

    I seem to have a brain cramp and need some help. A card is chosen randomly from a standard deck of 52 cards and replaced. On average, how many...

    Started by robozak‎, 09-22-2011 05:49 PM
    • Replies: 2
    • Views: 2,136
    09-23-2011, 05:04 PM Go to last post
  10. another stats

    an experiment consists of choosing a point (x,y) at random from the interior of the circle disk x^2+y^2= 4 a/ find P(X>or = 1/2) b/ find the...

    Started by sonpham‎, 09-22-2011 04:33 PM
    • Replies: 0
    • Views: 1,693
    09-22-2011, 04:33 PM Go to last post
  11. need help with stats

    hurricanes hit florida independently of each other, at an average rate of once every four years. what is the probability that florida will be hit by...

    Started by sonpham‎, 09-22-2011 01:05 PM
    • Replies: 1
    • Views: 1,895
    09-22-2011, 01:36 PM Go to last post
  12. stats uniform distribution

    suppose the random variable Q is uniformly distributed on the interval . find the probability that the roots of the equation 4t^2 +...

    Started by sonpham‎, 09-22-2011 01:10 PM
    • Replies: 1
    • Views: 3,666
    09-22-2011, 01:23 PM Go to last post
  13. Different between "X % more likely" vs. "X times more likely"

    I often see something like "smokers are 10% more likely to get cancer than non-smokers." Is this equivalent to saying smokers are "10 times more...

    Started by grreee12‎, 09-21-2011 10:25 PM
    odds ratios, probability
    • Replies: 0
    • Views: 28,773
    09-21-2011, 10:25 PM Go to last post
  14. need help to calculate variance of sales

    Hi, I'm trying to calculate numerical value of the variance of sales, and the probability of a sale greater than 6300 cans. but it seems wrong...

    Started by meriksso‎, 09-19-2011 10:46 PM
    probability question, variance, z-table
    • Replies: 14
    • Views: 6,763
    09-21-2011, 07:18 PM Go to last post
  15. Pattern Recognition (Bayesian Statistics) :D Perhaps someone could help!

    :D Greetings everyone! The question is: A) Its on bayesian statistics, specifically error. So the question first states that Total error = the...

    Started by Ser Davos Seaworth‎, 09-21-2011 12:24 PM
    • Replies: 0
    • Views: 2,180
    09-21-2011, 12:24 PM Go to last post
  16. Bayes Rule Headache

    1. Say we are interested in the effect of a new medication that may help people with an illness. 40% of all people in our population of interest have...

    Started by gradstud‎, 09-21-2011 10:39 AM
    • Replies: 0
    • Views: 2,771
    09-21-2011, 10:39 AM Go to last post
  17. expected standard deviation and confidence interval

    Hi, I have a problem with scoring an ipsative questionnaire. In this questionnaire people get 7 different statements in which they divide balls...

    Started by fraatsr‎, 09-21-2011 04:48 AM
    • Replies: 0
    • Views: 1,930
    09-21-2011, 04:48 AM Go to last post
  18. Red face Probability and percentiles

    An airline has found from past experience that the weight of checked-in baggage items is Normally distributed with mean 13 kg and standard deviation...

    Started by andy35‎, 09-20-2011 11:50 PM
    • Replies: 0
    • Views: 3,362
    09-20-2011, 11:50 PM Go to last post
  19. Cool Please help me with Poisson Distribution

    :shakehead The class had calculated that 80% of Statistics and Modelling lessons, are interrupted by one or more notices. Find a) the average...

    Started by tosucceed999‎, 09-19-2011 09:32 PM
    • Replies: 4
    • Views: 3,079
    09-20-2011, 02:19 AM Go to last post
  20. 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: 4,459
    09-19-2011, 10:43 AM Go to last post
  21. Neat Problem w/Time Dependence (Bayesian?)

    Assume a finite set of N probability distributions with shapes that change in time. The shapes change in a known fashion with time, and are...

    Started by peejay21‎, 09-16-2011 07:14 PM
    • Replies: 3
    • Views: 3,021
    09-17-2011, 10:01 AM Go to last post
  22. I need Probability help

    hey folks! I've been given two probability questions for my home assignment. I've been trying to solve these problems but having difficulty...can...

    Started by silentcore‎, 12-19-2010 10:03 AM
    • Replies: 4
    • Views: 3,848
    09-17-2011, 04:40 AM Go to last post
  23. 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: 4,742
    09-16-2011, 03:43 AM Go to last post
  24. Why can't t/(1-t) be a moment generating function for a R.V?

    Hi there, having a bit of trouble with this one: Explain/show why there can be no random variable for which Mx(t) (moment generating function) = t...

    Started by rpcas‎, 09-12-2011 06:49 AM
    • Replies: 11
    • Views: 9,645
    09-15-2011, 03:08 AM Go to last post
  25. joint probability questions help?

    You were given the following joint probability function for Y1 = { 0, if the child survived, 1, if not, and Y2 = { 0 if no belt used, 1 if adult...

    Started by demarkus‎, 09-14-2011 07:14 PM
    • Replies: 0
    • Views: 3,304
    09-14-2011, 07:14 PM Go to last post
  26. 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: 3,756
    09-14-2011, 03:42 PM Go to last post
  27. Thumbs up Proabability

    Hi I've Some Question like this, Employees of a local university have been classified according to gender and job type. If an employee is...

    Started by jilani919‎, 09-14-2011 01:51 PM
    • Replies: 0
    • Views: 3,386
    09-14-2011, 01:51 PM Go to last post
  28. Probabilities: "Drunk is 10 steps away form falling in the dock"

    A drunk is 10 steps away from falling in the dock. Every step he takes is either directly towards or away from the dock and he is equally likely to...

    Started by Taylor Truett‎, 09-14-2011 11:26 AM
    • Replies: 4
    • Views: 3,215
    09-14-2011, 12:28 PM Go to last post
  29. Unhappy really urgent probability problem - is it bayesian?

    Hi, I have an urgent problem but I'm a little lost. Is this probability question referring to the use of Bayes' theorem? Firstly, I don't...

    Started by anony‎, 09-14-2011 05:46 AM
    bayes, prior, probability, sample text
    • Replies: 4
    • Views: 2,818
    09-14-2011, 08:48 AM Go to last post
  30. Probability Question

    I have been trying to work though this problem and have gotten stuck; I am trying to set up a table to help me calculate the probabilities...

    Started by DKRbella0814‎, 09-10-2011 02:33 PM
    • Replies: 1
    • Views: 6,146
    09-12-2011, 03:27 PM Go to last post
  31. Drawing more than 1 marble

    Hi, My answer doesnt tally with the answer provided, can someone please have a look and figure out where I am mistaken? Thank u so much If four...

    Started by SadieKhan‎, 09-11-2011 04:07 PM
    • Replies: 2
    • Views: 2,419
    09-12-2011, 01:14 PM Go to last post
  32. Solve this??

    There are w cakes and n people. The cakes are distributed to people randomly. Find the expected number of cakes a 'i' person can receive. The...

    Started by ackr1201‎, 09-11-2011 11:46 PM
    • Replies: 1
    • Views: 1,863
    09-12-2011, 07:10 AM Go to last post
  33. Standard deviation and mean, find probabilities.

    Hi guys, the question is this, (it's a first year stats course online quiz question) Tourism Queensland monitored the duration of calls to...

    Started by Michael Chen‎, 09-11-2011 07:41 AM
    • Replies: 1
    • Views: 3,918
    09-11-2011, 08:11 AM Go to last post
  34. Bayesian inference - or maybe i'm doing that wrong?

    So first of all - hello! Now, my problem: So I started baye's theorem, and tutor said, that mostly i will need that formula: In denominator...

    Started by Lode‎, 09-09-2011 11:36 AM
    • Replies: 3
    • Views: 2,498
    09-10-2011, 10:54 AM Go to last post
  35. converting a frequency matrix to a transition probability matrix

    Hi there, I have speed and power in two columns. Each speed, power point is a referred to as a state. I've created a frequency matrix showing...

    Started by bradyj2‎, 09-09-2011 05:38 AM
    • Replies: 0
    • Views: 3,979
    09-09-2011, 05:38 AM Go to last post
  36. Dice probability

    Hello people, I have a very simple probability question that I need to solve a problem (recreational mathematics). Anyway, I would like to know how...

    Started by DanFran‎, 09-08-2011 09:55 AM
    • Replies: 3
    • Views: 2,004
    09-08-2011, 11:52 AM Go to last post
  37. 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: 1,957
    09-06-2011, 05:54 PM Go to last post
  38. I need solution for this problem ASAP. Probability problem with two arrays of holes.

    Given two arrays of holes, Each hole can be filled in by a white ball or a black ball. 1. Each array has n holes, and can be filled in by r black...

    Started by dnmrao‎, 09-06-2011 05:26 AM
    arrays, holes
    • Replies: 2
    • Views: 2,122
    09-06-2011, 07:10 AM Go to last post
  39. Basic (or maybe not so) probability problem/experiment/question.

    I came upon an interesting probabilistic assertion in a book I'm reading. Here's the quote: "Once in a while we find co-occurrences, and we're...

    Started by bfotk‎, 09-05-2011 05:23 PM
    probability question
    • Replies: 6
    • Views: 2,737
    09-06-2011, 03:20 AM Go to last post
  40. Joint Probability

    Hi everyone, For any generic continuous joint CDF, what is the probability of Pr(X=z,Y=z) where X and Y are two random variables on the support of...

    Started by sangiobbe‎, 09-03-2011 11:18 AM
    • Replies: 10
    • Views: 3,188
    09-05-2011, 12:36 PM Go to last post
  41. Bayes Theorem Question for Probability Newbie

    Hi, I'm trying to brush on probability for a graduate class. I've been reading about bayes theorem, which my book states as: P(A | B) = P(B |...

    Started by prob_question‎, 09-05-2011 08:25 AM
    • Replies: 2
    • Views: 2,480
    09-05-2011, 10:42 AM Go to last post
  42. Probability question.... refresher

    Hey all, I'm trying to remember some basic combination stuff. Here's the question. There are 8 seats in a line. If 4 boys and 4 girls are seated...

    Started by Dresden‎, 09-01-2011 07:12 PM
    • Replies: 2
    • Views: 1,953
    09-04-2011, 04:43 PM Go to last post
  43. Lightbulb What is the chance to have a mutual friend with a random person ?

    We have a social network say facebook. We know that it is composed by 500 milion of users. We know that each user have an average of 135 friend. ...

    Started by giudf‎, 03-14-2011 04:11 AM
    mutual friend, six degree, social network
    • Replies: 8
    • Views: 9,951
    09-02-2011, 06:35 PM Go to last post
  44. probability question about composing a song

    i have 450 numbers and i want to know which group of numbers have more probability lower of the average or higher and why :i dont know statistics...

    Started by memas‎, 09-01-2011 01:01 PM
    • Replies: 0
    • Views: 1,425
    09-01-2011, 01:01 PM Go to last post
  45. Comparing Gaussian curves

    Hi, I have two points A(30.333,100) and B(30.333151665,80) I need to draw Gaussian for each point separately and need to check their overlap...

    Started by asd123‎, 03-04-2011 04:28 AM
    • Replies: 7
    • Views: 9,140
    08-31-2011, 05:35 PM Go to last post
  46. Chi-squared and T distribution, just need a check

    These problems where review from a prior class, i think they are correct but not positive. Q1. Using the T distribution, find the following and...

    Started by MikeM‎, 08-27-2011 07:45 PM
    • Replies: 1
    • Views: 2,025
    08-31-2011, 12:03 PM Go to last post
  47. Choice probability

    I need to calculate the binary choice probabilty of 2 alternatives i and j- Each of the alternative is charectarised with a part of measurable and...

    Started by Arefe‎, 08-29-2011 03:56 PM
    choice probability
    • Replies: 1
    • Views: 2,425
    08-31-2011, 11:59 AM Go to last post
  48. 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: 3,011
    08-31-2011, 11:18 AM Go to last post
  49. product of N normal distributions

    We are given N normal functions, with means \mu_i, and variances \sigma_i^2, i in 1...N. I need to find a formula for the product of the N...

    Started by Camilo‎, 08-25-2011 12:26 AM
    gaussian, gaussian distribution, normal curve
    • Replies: 2
    • Views: 4,986
    08-26-2011, 05:06 PM Go to last post
  50. 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: 4,396
    08-25-2011, 02:09 PM Go to last post
  51. multivariate mutual information

    Hello everyone :wave:, I wonder if the equation concernat multivariate mutual information MI (X, Y, Z) = MI (X, Y) - MI (X, Y | Z) is the same...

    Started by cyrine‎, 07-30-2010 04:51 AM
    • Replies: 1
    • Views: 2,599
    08-25-2011, 07:01 AM Go to last post
  52. Probability a Selection wins the most races

    I have 12 races with 6 participants (Sel'n 1 - Sel'n 6) and below is the probablities on how many wins each selection would get... Sel'n 1 Sel'n...

    Started by adam2308‎, 08-24-2011 03:05 PM
    • Replies: 2
    • Views: 2,415
    08-24-2011, 03:55 PM Go to last post
  53. Probability Density function table

    given the pdf table for function pxy(x,y) for 2 discrete random variables X and Y which take values 0,1. What do E and Cov(X,Y) equal and what is the...

    Started by marley.grace‎, 08-24-2011 07:17 AM
    • Replies: 4
    • Views: 4,331
    08-24-2011, 09:45 AM Go to last post
  54. r-value > Probability

    I have two wrestlers who are going to arm-wrestle. I want to try to predict who will win based on their previous fights against other opponents....

    Started by cmarkc‎, 08-19-2011 08:37 AM
    • Replies: 14
    • Views: 7,035
    08-24-2011, 06:14 AM Go to last post
  55. Probability Table Question

    Hi, I have been working on part (d) of the following question for so many days and I just can't carry on anymore because I'm too confused. ...

    Started by msda‎, 08-24-2011 01:12 AM
    probability
    • Replies: 0
    • Views: 1,714
    08-24-2011, 01:12 AM Go to last post
  56. showing estimator is the minimum variance estimator for a

    Let X_1, X_2,...,X_n be a random sample from a geometric distribution, with probability function given by. ...

    Started by whiteboard‎, 08-22-2011 08:35 PM
    • Replies: 3
    • Views: 3,072
    08-23-2011, 03:17 AM Go to last post
  57. another baseball question

    Player will bat 4 times in this game. He is expected to get a single .15 of the time he goes to bat for 1 total base, he will get a double .05 a...

    Started by buddyreno‎, 08-22-2011 04:27 PM
    • Replies: 0
    • Views: 1,902
    08-22-2011, 04:27 PM Go to last post
  58. Convolution and conditionning: S=X+Y X=two point distribution Y=Normal

    Hello, can anyone help to find the conditional distribution of X given S if S=X+Y X is a r.v. {0,1} 0 with probability p and 1 with probability...

    Started by cactusenok‎, 08-22-2011 09:39 AM
    • Replies: 1
    • Views: 3,032
    08-22-2011, 10:46 AM Go to last post
  59. drawing more than one marble at random

    Hi, Can you please check my solutions? I guess, I have got them right.Thanks Probability 1) If four marbles are drawn at random from a bag that...

    Started by SadieKhan‎, 08-21-2011 10:35 PM
    • Replies: 4
    • Views: 4,832
    08-22-2011, 08:30 AM Go to last post
  60. Cool okay need insight on this...

    I have attempted to work this out twice use 2 different formulas (1.interval estimation of a population mean (small-sample case) 2. interval...

    Started by ecohelp‎, 10-15-2005 12:04 PM
    • Replies: 4
    • Views: 3,525
    08-22-2011, 06:56 AM Go to last post

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