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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: 30,208
    09-30-2005, 09:44 AM Go to last post
  1. Probability Question

    Question 1: Suppose that in a weekly lottery you have probability .02 of winning a prize with a single ticket and that you buy 1 ticket per week...

    Started by jenn.sf‎, 10-19-2011 10:56 AM
    • Replies: 5
    • Views: 3,388
    10-19-2011, 03:46 PM Go to last post
  2. Probabilty Question

    I am looking at 6 events. The probabilities of each occuring independantly are as follows: Event 1- 7% Event 2- 4% Event 3- 7% Event 4- 4%...

    Started by rhhudson‎, 10-18-2011 02:41 PM
    • Replies: 5
    • Views: 3,312
    10-19-2011, 03:46 AM Go to last post
  3. statistics

    if T follows a t7 distribution, find t0 such that P(|T|<t0)=.9 and P(T>t0)= .05

    Started by sonpham‎, 10-17-2011 08:36 PM
    • Replies: 2
    • Views: 5,109
    10-18-2011, 08:07 AM Go to last post
  4. Probability, University, Married, Car Insurance, Help!

    Haha, I thought I'd be creative with my title.... let's get some facts straight, this has to do with probability and University but I'm not married...

    Started by agent2421‎, 10-18-2011 01:52 AM
    • Replies: 1
    • Views: 2,587
    10-18-2011, 06:07 AM Go to last post
  5. Multinomial Distribution shortcut?

    I'm wondering is there any kind of shortcut with the Multinomial Distribution. Suppose i have 6 balls:{3R,2B,1G} and i make 3 draws (with...

    Started by hughesne‎, 10-17-2011 01:10 PM
    • Replies: 4
    • Views: 3,299
    10-17-2011, 03:05 PM Go to last post
  6. Dice and Don't Cares

    Hi. I'm working on deriving a probability formula to help in some research I'm doing, but I've hit a wall. I've managed to reduce my problem down...

    Started by zogg‎, 10-13-2011 07:26 AM
    dice
    • Replies: 3
    • Views: 1,947
    10-17-2011, 08:19 AM Go to last post
  7. Conditional Probability Venn Diagram

    I am having a very difficult time trying to determine how they got the probabilities shown in the Venn Diagram from the above information. I'm...

    Started by JoeO15‎, 10-16-2011 03:16 PM
    • Replies: 3
    • Views: 5,514
    10-17-2011, 03:09 AM Go to last post
  8. Using Bayes Theorem, need help.

    I have been trying to solve this problem using Bayes theorem but know I have gone wrong somewhere. Question breaks down to this. defect occurs...

    Started by tapciv‎, 10-17-2011 12:29 AM
    • Replies: 3
    • Views: 3,103
    10-17-2011, 01:23 AM Go to last post
  9. Third Moment about the mean

    Let E=μ4 S=/σ^3, where E(X-μ)^3=E(X^3)-3+2^3 How can I rewrite the right hand side of the above expression in terms of μ, σ^2, S and μ4. ...

    Started by alias‎, 10-16-2011 06:06 AM
    • Replies: 11
    • Views: 8,713
    10-17-2011, 12:06 AM Go to last post
  10. Expected value of Yi^2

    Yi is i.i.d. N(0,σ^2) for i=1 to n. E=0, var=σ^2 Show that E = 1 if E = 0, how does the the sum of squared Yi's equal 1?

    Started by alias‎, 10-16-2011 07:28 PM
    • Replies: 3
    • Views: 5,550
    10-16-2011, 11:48 PM Go to last post
  11. Express E[X-μ]^4 in terms of....

    X is a random variable with moments E, E, E. Suppose var(X)= σ^2, skewness is given as S=/(σ^3). Express the right side of the following as in...

    Started by alias‎, 10-16-2011 10:52 PM
    • Replies: 0
    • Views: 132,799
    10-16-2011, 10:52 PM Go to last post
  12. Question. Non parametric analysis in SAS

    I have a question perhaps someone can easily answer. I used a random block design and couldn't get normal distribution on the data. I then switched...

    Started by Tyler Brannon‎, 10-16-2011 09:38 PM
    • Replies: 4
    • Views: 3,133
    10-16-2011, 09:56 PM Go to last post
  13. Question Binomial Probability, Real Limits, X=0

    Can someone have guessed on quiz and got all 50 questions wrong, but still get 100%? Thanks in advance! :D

    Started by jimbrowsky‎, 10-16-2011 01:22 AM
    binomial, binomial distribution, binomials, continuous, real limits
    • Replies: 7
    • Views: 4,428
    10-16-2011, 04:36 PM Go to last post
  14. Μarginal Distributions of f(x,y)

    f(x,y) = e^(-x), 0<=x<inf, 0<=y<=1 To find the marginal PDFs here is what I did so far: Marginal Distribution of x: f(x) = integral...

    Started by alias‎, 10-16-2011 06:28 AM
    • Replies: 2
    • Views: 123,163
    10-16-2011, 12:42 PM Go to last post
  15. need help on Conditional Probability problems...

    Can anybody please help me to work out on following problems? 1. The probability Pk that a family has k children is given by p0 = p1 = a, Pk =...

    Started by Dipti Ranjan Biswal‎, 10-15-2011 09:13 PM
    • Replies: 1
    • Views: 2,706
    10-16-2011, 01:01 AM Go to last post
  16. linearly independent

    prove that if A= <------(it should to be a column not row, cuz i couldnt make it into a column form ) and the columns of B are independent ,...

    Started by qootie‎, 10-15-2011 11:32 PM
    • Replies: 1
    • Views: 2,061
    10-15-2011, 11:47 PM Go to last post
  17. Basic probability question

    f(x) = x/4 for 0<x<2 = 1- x/4 for 2<x<4 = 0 otherwise Find c1 and c2 such that probability of (c1<x<c2)=0.6 So I tried to plot the...

    Started by ahoy‎, 10-14-2011 04:58 PM
    • Replies: 3
    • Views: 1,797
    10-15-2011, 03:27 AM Go to last post
  18. probability given p=.10

    Question: A manufacturer of power meters, which are used to regulate energy thresholds of a data-communications system, claims that when its...

    Started by MikeM‎, 10-13-2011 07:21 PM
    • Replies: 4
    • Views: 3,341
    10-14-2011, 05:30 AM Go to last post
  19. Poisson Distribution and binomial distribution

    Can somebody explain the practical meaning of the mean (np, or lambda) and variance (np) of the Poisson Distribution with a real example? I am...

    Started by yifang‎, 10-13-2011 11:13 PM
    poisson mean/variance
    • Replies: 3
    • Views: 3,429
    10-14-2011, 01:44 AM Go to last post
  20. central limit theorem

    The central limit theorem can be used to analyze round-off error. Suppose that the round-off error on one number is represented as a uniform random...

    Started by sonpham‎, 10-12-2011 07:32 PM
    • Replies: 0
    • Views: 1,915
    10-12-2011, 07:32 PM Go to last post
  21. Smile Uniform and Independent Probability (Simple Problem)

    Hey there, I have a quick question. The problem: 3 numbers, say X, Y, and Z are chosen from a set of numbers (1 to n) where n is greater or...

    Started by blackrobe89‎, 10-11-2011 11:05 PM
    distribution, independent, probability, uniform
    • Replies: 7
    • Views: 3,297
    10-12-2011, 08:17 AM Go to last post
  22. Need help with what is probably a simple EMV problem concerning demand

    Hi all, I am becoming quite frustrated with this problem, and I KNOW it's simple, I just don't feel comfortable with either answer I come up with....

    Started by Drosius‎, 10-12-2011 05:12 AM
    • Replies: 0
    • Views: 1,398
    10-12-2011, 05:12 AM Go to last post
  23. Random Variables with not degenerated distribution

    Hi How do i proof the following: Consider (, B|, lebesgue measure) Show that there exists no family of iid rv {X_t:t \in } with not degenerated...

    Started by lheiner75‎, 10-11-2011 03:00 PM
    • Replies: 0
    • Views: 1,675
    10-11-2011, 03:00 PM Go to last post
  24. geometrical distribution question

    x has a geometrical distribution with parameter p 1.show that P( X= m+k| X>m) = P(X=k) 2. also explain the means of this equality please...

    Started by qootie‎, 10-09-2011 05:41 PM
    • Replies: 3
    • Views: 2,717
    10-11-2011, 05:09 AM Go to last post
  25. probability, independent or dependent

    Hello. I roll a dice twice. Let's say that A = odd number on first, B = even number on second, C = sum is odd. Now, I need to calculate P(A),...

    Started by 8Julio‎, 10-08-2011 02:11 AM
    • Replies: 7
    • Views: 3,166
    10-10-2011, 09:56 AM Go to last post
  26. Basic Probability Homework

    We just stated to have about probability at the ongoing course. We have this Exercise which I, apparently, cannot figure out how to calculate. "...

    Started by hotjer‎, 10-10-2011 06:11 AM
    • Replies: 4
    • Views: 3,271
    10-10-2011, 08:13 AM Go to last post
  27. Random Result of an experiment

    Hello, I am analyzing some data in order to classify between two groups. My test set is rather small, let's say n1 people from group 1 and n2...

    Started by NN_STAT‎, 10-10-2011 04:20 AM
    • Replies: 2
    • Views: 2,198
    10-10-2011, 07:27 AM Go to last post
  28. I need some help with Probability Problem.

    The local barber shop is home to three barbers, 1, 2, and 3. The barbers appear identical but vary in their ability to provide good haircuts. The...

    Started by no1stu‎, 10-08-2011 11:29 AM
    • Replies: 5
    • Views: 3,789
    10-09-2011, 01:53 AM Go to last post
  29. Poisson or binomial or something completely different?

    I need to calculate the probability of a Y/N type issue, with varying probabilities of success. For example, I need to know the probability of...

    Started by jcm4ccc‎, 10-07-2011 08:49 AM
    • Replies: 1
    • Views: 2,311
    10-07-2011, 09:35 AM Go to last post
  30. Hypergeometric?

    I read online an erasure analysis by a well-respected independent company. An erasure analysis is used in educational testing for a paper-and-pencil...

    Started by jcm4ccc‎, 10-07-2011 09:04 AM
    • Replies: 0
    • Views: 1,794
    10-07-2011, 09:04 AM Go to last post
  31. Classical Probability

    Greetings from new comer! Here is my question I could not figure it out by myself: There are two types of bags H and R in a single box (black box...

    Started by yifang‎, 10-06-2011 03:59 PM
    classical bayesian, probability estimate
    • Replies: 5
    • Views: 2,404
    10-06-2011, 08:09 PM Go to last post
  32. More education = less income?

    Years ago a guy from ESA told me that at his 50 year high school reunion the only millionaire was the only guy who didn't go to college. ...

    Started by Outlier‎, 10-06-2011 09:15 AM
    • Replies: 9
    • Views: 2,539
    10-06-2011, 05:58 PM Go to last post
  33. Exclamation How to find the cummulative distribution function from a probability density function

    Hi, The pdf is here: Uploaded with ImageShack.us This is what I have done, but the answer is wrong. May I know how should i do this?

    Started by Stupid Idiot‎, 10-06-2011 10:42 AM
    • Replies: 1
    • Views: 2,866
    10-06-2011, 12:32 PM Go to last post
  34. exponential distribution light bulbs hypothesis testing

    Two companies make a similar light bulb. Suppose random samples of light bulbs from both companies are obtained and the lifetimes for these light...

    Started by whiteboard‎, 10-01-2011 08:59 AM
    • Replies: 3
    • Views: 4,771
    10-06-2011, 12:05 PM Go to last post
  35. need help with stats

    a games is played on a board marked off into a line of four squares. a player starts on the square numbered 2. on each turn, a six-sided die is...

    Started by sonpham‎, 10-05-2011 10:10 PM
    • Replies: 1
    • Views: 2,631
    10-06-2011, 08:36 AM Go to last post
  36. Find the constant that makes f(x,y) a probability density function

    Let X and Y have a joint density function given by f(x,y) =e^(-kX), 0<=X<inf, 0<=Y<=1, k is a constant, and 0 elsewhere Find the value...

    Started by alias‎, 10-05-2011 04:25 PM
    • Replies: 12
    • Views: 7,856
    10-05-2011, 09:36 PM Go to last post
  37. Distributions and Percentages

    HW problem here. Suppose that when the Slease company overcharges a customer, the distribution of the amount overcharged (expressed as a...

    Started by adumau‎, 10-04-2011 02:47 PM
    • Replies: 1
    • Views: 3,645
    10-04-2011, 05:22 PM Go to last post
  38. 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: 8,191
    10-04-2011, 01:58 PM Go to last post
  39. Thumbs down Stochastic Problem, any help greatly appreciated

    Admittedly I am a bit rusty with my stochastic modelling, but here is the question I have been given. I am just looking for a bit of a guide as to...

    Started by OToole‎, 09-25-2011 01:57 PM
    • Replies: 9
    • Views: 3,407
    10-04-2011, 12:27 PM Go to last post
  40. HW: Exponential random variable

    Hi, I've been a asked question that I am unable to deal with. For part (a), how do I find b? How do I approach this question as a whole?...

    Started by Peytonator‎, 10-03-2011 07:35 AM
    • Replies: 6
    • Views: 2,373
    10-04-2011, 11:08 AM Go to last post
  41. First post, stuck on question.

    Hi all, got stuck on a problem and after googling for calculators for hours, finally asked myself, hmm there must be a statistics/probability...

    Started by rjbjr‎, 09-30-2011 08:28 AM
    • Replies: 2
    • Views: 2,515
    10-04-2011, 04:39 AM Go to last post
  42. HW: Probability of baby gender given ultrasound results

    Given the data on 1000 births, determine if an ultrasound is a reliable method for predicting unborn gender: Ultrasound predicted female/Actual...

    Started by Kyle Patnode‎, 10-02-2011 08:36 PM
    • Replies: 1
    • Views: 7,065
    10-02-2011, 09:02 PM Go to last post
  43. 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: 6,661
    10-02-2011, 05:12 PM Go to last post
  44. Probability assignment

    Let Y be binary variable P(Y = 1) = P(Y = 0) = 0.5 and X a random variable uniform on when Y = 0 and uniform when Y = 1. Draw mean of X and P(Y =...

    Started by Luksdoc‎, 10-02-2011 09:42 AM
    conditional probability, uniform pdf
    • Replies: 0
    • Views: 1,655
    10-02-2011, 09:42 AM Go to last post
  45. A challenge problem (for me at least)

    Hello everyone, this is my first post on this forum. My name is Ryan and I am a first year grad student in electrical engineering at a college in...

    Started by RyanM‎, 10-01-2011 05:47 PM
    • Replies: 1
    • Views: 3,613
    10-02-2011, 01:28 AM Go to last post
  46. Hi, i'm new to probability and to this site and I need help ^^

    Hi, it would be very appreciated if someone can help me figure out how to find part b) and c) please. Problem: A work crew for a building...

    Started by william‎, 10-01-2011 10:38 AM
    • Replies: 3
    • Views: 2,359
    10-01-2011, 05:01 PM Go to last post
  47. Probability of new lottery

    Hi everyone, I come from the Czech Republic and I received a business case at work. I am supposed to come up with a new lottery which would be a...

    Started by bananow‎, 10-01-2011 12:01 PM
    • Replies: 3
    • Views: 2,518
    10-01-2011, 03:07 PM Go to last post
  48. Need some tips for a couple of proofs.

    Hi there. I have been working on these problems but I'm not sure if what I'm doing is right. 1) I'm trying to prove that two R.V.s X & Y are...

    Started by c2q‎, 09-28-2011 11:08 PM
    • Replies: 1
    • Views: 1,712
    10-01-2011, 01:14 AM Go to last post
  49. i need help with this please!!!!

    Angus reid conducted a survey of adult canadians finding that over all 56% supported the legalization of marijuana. the percenatage of support was...

    Started by geezy‎, 09-30-2011 09:11 PM
    business statistic, help needed, stats
    • Replies: 1
    • Views: 2,088
    09-30-2011, 11:50 PM Go to last post
  50. conditional variance problem

    hi there, not sure on how to approach this problem. I'm a bit lost. how can I show that a rv y which can be expressed a function of rv x, say...

    Started by c2q‎, 09-30-2011 06:51 PM
    • Replies: 0
    • Views: 1,648
    09-30-2011, 06:51 PM Go to last post
  51. how to evaluate this expected value?

    hi I've been stuck on trying to understand a part of this proof I am reading. I want to know how they got from this step to the next = ...

    Started by c2q‎, 09-30-2011 05:06 PM
    • Replies: 0
    • Views: 2,307
    09-30-2011, 05:06 PM Go to last post
  52. Question Finding the max and min P-value from an F-tets

    There is a following task in my econometrics HW: 1) I have 25 values of the {X} random value. First I find the variation, then the estimation for...

    Started by Artemy Piskarev‎, 09-28-2011 03:54 AM
    • Replies: 7
    • Views: 8,916
    09-30-2011, 07:28 AM Go to last post
  53. New to stats, stuck on a probability problem

    Hi there, I'm new to stats, stuck on how to get any further with this question. Not to sure on how to read the tables... Mean= 1250 Std = 120...

    Started by mia111‎, 09-29-2011 03:43 AM
    • Replies: 1
    • Views: 2,448
    09-29-2011, 06:29 AM Go to last post
  54. Yet (another) derivation from linear mixed effects regression...

    hello there... first of all, thank you very much to everyone who has replied to my questions and has helped me understand these things a little bit...

    Started by will22‎, 09-26-2011 09:37 AM
    • Replies: 3
    • Views: 2,028
    09-28-2011, 08:07 PM Go to last post
  55. General question on a likelihood result

    In my stat inference class, we've been covering likelihood a bit. We were shown a result that is identical to the one posted here:...

    Started by jamesmartinn‎, 09-27-2011 10:35 PM
    • Replies: 2
    • Views: 2,875
    09-28-2011, 07:05 PM Go to last post
  56. Cool Card Problem

    Hi everyone, My problem is something like this: I have a deck of cards, without jokers (52 cards total). 30 cards are dealt. What is the...

    Started by ttactics‎, 09-28-2011 04:11 PM
    card
    • Replies: 1
    • Views: 1,561
    09-28-2011, 04:27 PM Go to last post
  57. Coin toss question

    How about a hint about how to approach the following problem. If you toss a fair coin X number of times, what would be the probability that the...

    Started by Mike H.‎, 09-21-2011 07:35 AM
    • Replies: 10
    • Views: 3,426
    09-28-2011, 03:45 PM Go to last post
  58. Determine how close a real distribution is to an ideal one.

    My apologies if this is an insultingly easy question: I'm trying to determine how close a real distribution is to an ideal one. Example: a...

    Started by CECampbell‎, 09-28-2011 08:36 AM
    • Replies: 1
    • Views: 1,566
    09-28-2011, 11:28 AM Go to last post
  59. Please helpp!! Probability estimation!! : (

    City A has a population of 4 million, and city B has 6 million. Both cities have the same proportion of women. A random sample (with replacement)...

    Started by mariawashere‎, 09-27-2011 05:18 PM
    probability estimate
    • Replies: 1
    • Views: 3,407
    09-28-2011, 04:23 AM Go to last post
  60. 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: 3,430
    09-26-2011, 10:25 PM Go to last post

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