1. Announcement:
    Want access to a chatbox?
    Dason ‎(Devorador de queso)
    05-10-2017
    Views:
    1,959
+ Post New Thread
Page 4 of 91 FirstFirst 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 54 ... LastLast
Threads 181 to 240 of 5454

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: 30,397
    09-30-2005, 09:44 AM Go to last post
  1. Finding joint density

    Let Y1 ~ N(1,3) & Y2~N(2,5) be independent random variables. Find the joint density of W1 and W2 if W1 = Y1 +2Y2 and W2=4Y1-Y2. How should I...

    Started by AlexSmith‎, 01-31-2011 11:45 PM
    • Replies: 2
    • Views: 2,738
    02-01-2011, 12:14 PM Go to last post
  2. If a RV is a function of another RV, then they are dependent?

    Hello all! This is my first post on this forum. I just have a simple question. If a rv Z is a function of another rv X, then is it guaranteed that...

    Started by alext9036‎, 02-23-2013 12:26 AM
    • Replies: 6
    • Views: 1,943
    02-26-2013, 04:43 AM Go to last post
  3. Simple Probability Question

    Hello everyone, I am having problem with a question: A manufacturer has 100 memory chips in stock, 4% of which are likely to be defective based on...

    Started by alext9036‎, 02-25-2013 09:10 PM
    • Replies: 1
    • Views: 2,549
    02-26-2013, 12:27 AM Go to last post
  4. Average Probablities over a quarter

    Hi all, I have the following probability data for a medical event, I need to find what was the overall probability for these three month? 1-...

    Started by alex_a‎, 10-31-2016 10:10 AM
    • Replies: 1
    • Views: 2,464
    10-31-2016, 01:48 PM Go to last post
  5. Decisions: probabilities and preferences

    Hello everybody. I was wondering if anyone could help me with the following problem. I need to decide between three options: a) spend my holiday...

    Started by Alex_Bham‎, 12-24-2012 10:29 AM
    preferences, probabilities
    • Replies: 2
    • Views: 1,692
    12-24-2012, 06:27 PM Go to last post
  6. Consistent Estimator

    I'm new here so i'm not sure what is wrong with my tex (i cant get +)so I will write the correct information under my tex lines A balanced one way...

    Started by alf‎, 11-06-2011 07:10 PM
    • Replies: 4
    • Views: 6,263
    11-09-2011, 11:41 AM Go to last post
  7. Monte carlo conditioning

    I am trying to learn how to reduce variance with conditioning. page 15 in these lecture notes: http://www.columbia.edu/~mh2078/MCS_Var_Red1.pdf ...

    Started by alf‎, 11-23-2011 04:02 PM
    • Replies: 13
    • Views: 3,061
    11-26-2011, 10:43 AM Go to last post
  8. Negativ Binomial distribution

    I am trying to count number of occurrence for variable X. I have considered X as Poisson distributed since this sounds like a Poisson process. But...

    Started by Alfa‎, 02-14-2015 02:57 AM
    • Replies: 2
    • Views: 2,095
    02-15-2015, 06:15 AM Go to last post
  9. Collect answers and determine probability

    Hello! I'm trying to figure out a method to predict the most probable answer taking into account previous answers collected in a database. ...

    Started by alfred‎, 03-22-2012 12:10 PM
    prediction, probability
    • Replies: 0
    • Views: 1,305
    03-22-2012, 12:10 PM Go to last post
  10. Can anyone explain me the solution of this exercise please?

    Hi i've found this exercise but I do not understand the solution: _________________________________________________________________ In a party c...

    Started by alfred_oh‎, 04-30-2013 04:15 AM
    • Replies: 2
    • Views: 1,578
    04-30-2013, 05:52 AM Go to last post
  11. Can anyone help me with this exercise?

    Hi! I have to do this exercise: Define a finite probabilistic Space (Ω; Pr) and 2 events A,B⊆ Ω and Pr ≠ Pr so that we can verify that ...

    Started by alfred_oh‎, 04-30-2013 06:53 AM
    • Replies: 1
    • Views: 1,907
    04-30-2013, 09:10 AM Go to last post
  12. Use a tree diagram to calculate the probability

    Hi everybody! I have to solve this exercise. We observe a tournament of 2 ^ n players, which consists of n rounds. In each round every 2 players...

    Started by alfred_oh‎, 05-03-2013 09:41 AM
    • Replies: 0
    • Views: 2,097
    05-03-2013, 09:41 AM Go to last post
  13. Density of a random variable

    Professor Roberto has to take an oral examination. The grading scale is as follows: 5: = best and 1: = worst. At most he only gives the note 4. Each...

    Started by alfred_oh‎, 04-30-2013 08:53 AM
    • Replies: 2
    • Views: 1,686
    04-30-2013, 09:22 AM Go to last post
  14. Calculate the Expected value,Variance,density and 2nd moment

    I have to solve this exercise. Here are also my solutions but I don't know if they're correct. Let Ω ⊆ R ^ 2 a finite set of points in R ^ 2....

    Started by alfred_oh‎, 05-03-2013 07:13 AM
    • Replies: 3
    • Views: 1,595
    05-04-2013, 08:04 AM Go to last post
  15. Property of independent random variables

    hello! I'm trying to understand the following property: Let X and Y be independent random variables z: = X + Y. Then where fZ (z) is the...

    Started by alfred_oh‎, 06-16-2013 12:20 PM
    • Replies: 3
    • Views: 1,720
    06-21-2013, 11:36 AM Go to last post
  16. Multiplication Theorem on Probability and proof

    Hi Everyone! I'm with Conditional Probability and I don't understan this theorem. Theorem: If then Proof:

    Started by alfred_oh‎, 06-15-2013 03:18 PM
    • Replies: 1
    • Views: 6,132
    06-22-2013, 11:22 AM Go to last post
  17. Binomial Distribution Analysis Question

    Hi everyone. I have a couple of questions and would greatly appreciate it if you could help me out! First, I'll provide some information: ...

    Started by Algebrah‎, 10-12-2011 04:51 PM
    • Replies: 4
    • Views: 11,653
    07-07-2012, 12:07 PM Go to last post
  18. 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: 7,881
    10-05-2011, 09:36 PM Go to last post
  19. 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: 8,777
    10-17-2011, 12:06 AM Go to last post
  20. 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: 123,216
    10-16-2011, 12:42 PM Go to last post
  21. 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: 5,622
    10-16-2011, 11:48 PM Go to last post
  22. 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: 132,874
    10-16-2011, 10:52 PM Go to last post
  23. show that the sum of e(i) = 0 and the sum of e(i)*Yhat(i) = 0

    Consider a usual multiple linear regression model: Y = X β + ε where Y is a (n x 1) response vector, X is a (n x p) matrix with its first column...

    Started by alias‎, 11-13-2011 03:34 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 14,616
    11-14-2011, 02:40 AM Go to last post
  24. Find the sample size

    Given info: cost1=$4, σ1=10, W1=N1/N=0.4 cost2=$9, σ2=20, W2=N2/N=0.6 The first part of this question asks for the values of n1/n and n2/n that...

    Started by alias‎, 02-05-2012 05:08 PM
    • Replies: 0
    • Views: 1,408
    02-05-2012, 05:08 PM Go to last post
  25. Bias of ratio estimator of pop.mean, DOUBLE POST

    I need to explain why the ratio estimator of the population mean is biased or unbiased. I am fairly certain that it is a biased estimator but I don't...

    Started by alias‎, 03-05-2012 12:29 AM
    • Replies: 0
    • Views: 2,312
    03-05-2012, 12:29 AM Go to last post
  26. Regression through origin, R^2=0

    A 2-variable regresssion with no intercept is given as: Yi=β1Xi +ui, show that r-squared for this model is equal to zero. I know that R^2...

    Started by alias‎, 10-21-2012 04:28 PM
    • Replies: 1
    • Views: 1,512
    10-21-2012, 09:59 PM Go to last post
  27. Linear Estimators help

    Let x1, x2, x3, x4, x5 be a random sample where each of these observations are independent, E=...=E = μ; Var(x1)=...=Var(x5) = σ^2. μ1hat = x1 -...

    Started by alias‎, 10-25-2012 07:58 AM
    • Replies: 1
    • Views: 1,820
    10-25-2012, 12:31 PM Go to last post
  28. Covariance of a linear comb. of independent variables

    U = y1 - 2y2 + y3 W = 3y1 + y2 E = 1, E = 2, E = -1, Var = 1, Var = 3, Var = 5 Var(U) = 12, Var(W) = 12 ;I hope y1, y2, y3 are Independent RV's...

    Started by alias‎, 10-18-2012 07:05 PM
    • Replies: 2
    • Views: 1,759
    10-18-2012, 10:48 PM Go to last post
  29. R^2=0

    How can I show that R^2 can be equal to or less than zero? I can't find an example.

    Started by alias‎, 11-01-2012 10:17 PM
    • Replies: 8
    • Views: 2,198
    11-02-2012, 12:48 AM Go to last post
  30. GLS estimation in SAS or SHAZAM Econometrics

    I've spent a long time looking for this so I thought I'd post for some help. C1i = β1+β2Q1i+β3(Q1i)^2+β4(Q1i)^3+εi, Var(εi) = σ^2*Q1i there are 28...

    Started by alias‎, 11-26-2012 01:47 PM
    • Replies: 9
    • Views: 6,758
    11-27-2012, 09:08 AM Go to last post
  31. Variance of Marginal effects

    I am trying to find Var(β3+xβ4+xβ5) where the x's are ages (20,30,40,50,55) The Marginal Function is: 14.09616 - 0.47037AGE + 0.0042AGE^2 I just...

    Started by alias‎, 11-22-2012 02:36 PM
    • Replies: 4
    • Views: 2,745
    11-22-2012, 11:17 PM Go to last post
  32. Having trouble with an expected value manipulation

    I'm having a little trouble with part a. Okay, okay, I'm having trouble with all of it, but I'm guessing that solving a will help with the rest....

    Started by alice9725‎, 01-31-2013 03:25 AM
    • Replies: 5
    • Views: 2,753
    01-31-2013, 10:54 PM Go to last post
  33. On Correlation Matrices

    Hi. This is a question from a question bank. I am self-studying for upcoming MS exam. a)Random vector X, elements are independent and zero mean....

    Started by alidemedi‎, 03-01-2012 11:13 PM
    • Replies: 6
    • Views: 2,225
    03-02-2012, 12:16 AM Go to last post
  34. Convergence in probability

    Hi, Can you please help me with the following question? Any hints, ideas would be much appreciated. Suppose that the sequence Xn converges to...

    Started by alien‎, 09-24-2007 05:50 PM
    • Replies: 4
    • Views: 4,974
    09-26-2007, 09:29 AM Go to last post
  35. identifying the distribution of a data set

    Dear all I am creating a software that is reading tcp packets from a link. I have the following information available: size of the packet: ...

    Started by alinaqvi90‎, 08-10-2006 09:47 PM
    • Replies: 4
    • Views: 5,279
    08-16-2006, 10:58 PM Go to last post
  36. Probability problem

    I am stuck, kindly help. There are two men V1 and V2. Each man has two buckets A and B. Bucket A contains numbered blocks from 7 to 14. Bucket B...

    Started by aliraja‎, 03-20-2015 06:30 AM
    • Replies: 3
    • Views: 1,446
    03-20-2015, 08:33 AM Go to last post
  37. Smile Please help with hard (well for me at least) probability question!!

    Just can't get my head around this question and it's killing me. Any bit of help would be amazing! thank you :) In a Jackpot Lottery, 1500 numbers...

    Started by alisha‎, 03-29-2012 07:33 PM
    • Replies: 0
    • Views: 1,346
    03-29-2012, 07:33 PM Go to last post
  38. Bayesian inference -(unknown mean and variance | and a proof)

    hello, i take a bayes lesson. there are 3 questions as my homework, i did one of them. i am new to statistics, so instructor said i can get help as...

    Started by aliyilmaz‎, 10-22-2010 09:47 AM
    • Replies: 4
    • Views: 5,105
    10-22-2010, 05:07 PM Go to last post
  39. Help...

    I'm not sure how to set up this binomial probability problem. I hope there is a good probability that someone can point me in the right direction. ...

    Started by allan‎, 10-09-2012 02:54 AM
    • Replies: 4
    • Views: 6,157
    10-09-2012, 09:55 PM Go to last post
  40. probability

    I'm very confused on where to start on my statistics project. I need help please. It says: "a woman has her purse stolen in LA by a young blonde...

    Started by allison‎, 12-04-2006 10:22 PM
    • Replies: 1
    • Views: 2,915
    12-05-2006, 09:25 AM Go to last post
  41. condition expectation and variance

    Let X, Y be independent exponential random variables with means 1 and 2 respectively. Let Z = 1, if X < Y Z = 0, otherwise Find E(X|Z) and...

    Started by allrighty128‎, 01-25-2008 11:10 PM
    • Replies: 0
    • Views: 2,675
    01-25-2008, 11:10 PM Go to last post
  42. Homework help?

    Hi... So I'm taking statistics as an independent study this summer... Having troubles. I'm on my last question for the night. Can someone walk me...

    Started by AlmostdsntCount‎, 06-13-2014 10:59 PM
    • Replies: 6
    • Views: 3,064
    06-18-2014, 01:45 PM Go to last post
  43. pdf for a statistic describing N independent normal variates

    I apologize in advance if this question has been asked before. One problem I have is in phrasing the question. Once I know the right language to...

    Started by alterisis‎, 01-19-2009 03:07 AM
    • Replies: 0
    • Views: 1,837
    01-19-2009, 03:07 AM Go to last post
  44. something ANOVA-like?

    I apologize for re-posting this question. I posted it a month ago in the probability forum, and after more than 100 views, there was no response...

    Started by alterisis‎, 02-17-2009 02:50 AM
    • Replies: 1
    • Views: 2,070
    03-01-2009, 09:42 PM Go to last post
  45. Comparing probability distributions over discrete random variables

    Hi guys Sorry if the post is not in the right place but I am new here. I am comparing the performance of two monte carlo methods. The results I...

    Started by altober‎, 05-08-2011 07:38 AM
    compare, discrete random variables, kl divergence, monte carlo, probability distributions
    • Replies: 0
    • Views: 2,998
    05-08-2011, 07:38 AM Go to last post
  46. Lightbulb Higher standard deviation than the mean

    HI ! Excuse me for my english, my writing is not very good. I want to know what implies or what explains in an excercise when the standard deviation...

    Started by alvaroiv‎, 06-22-2015 06:55 PM
    • Replies: 3
    • Views: 1,823
    06-23-2015, 07:42 AM Go to last post
  47. Multi-choice, out of time

    Hi In a multi-choice test with four answers each, I answer the first 75% but run out of time for the rest. In the few minutes left which is the best...

    Started by Alven99‎, 03-14-2013 11:55 AM
    • Replies: 4
    • Views: 1,892
    03-14-2013, 09:20 PM Go to last post
  48. random walk

    maybe you can help me... i've a theoretical problem: let X_n be a random walk over Z defined by For l,m in Z let

    Started by Alvin‎, 12-18-2006 08:34 PM
    • Replies: 1
    • Views: 3,884
    12-19-2006, 05:01 AM Go to last post
  49. Question Bayes Theorem - JohnM vs my textbook

    To JohnM or anyone who knows... I am struggling with positive and negative predictive values (PPV and NPV) homework problems. My textbook...

    Started by ALvr‎, 09-10-2006 05:19 PM
    • Replies: 2
    • Views: 3,003
    09-10-2006, 08:27 PM Go to last post
  50. Exclamation Help!!

    I have been trying to figure this problem out...I know it is probably the easiest thing, but I just can't put my finger on it.... If anyone could...

    Started by alysa ann‎, 10-10-2006 11:50 AM
    • Replies: 1
    • Views: 1,722
    10-11-2006, 08:40 AM Go to last post
  51. incremental Mutual information

    I computed Mutual information between two variables X and Y from data D at time t. I(X,Y) from D. Now at time t+1 new data arrived so, how i...

    Started by aman‎, 03-15-2012 05:53 PM
    entropy, mutual information, probability theory
    • Replies: 0
    • Views: 1,683
    03-15-2012, 05:53 PM Go to last post
  52. Assistance Please

    I'm having a tough time with my online stat course. Very limited feedback from instructor and I feel somewhat on my own. Can someone assist with...

    Started by amanda145‎, 11-04-2014 10:26 AM
    homework
    • Replies: 1
    • Views: 1,255
    11-04-2014, 12:56 PM Go to last post
  53. Probability that a number in a group of numbers to be less than the average of group

    Hi, I am new to probability and would like to know how to find the probability that a number in a group of numbers is less than the average of that...

    Started by amanjsingh‎, 05-19-2008 06:05 PM
    • Replies: 2
    • Views: 4,832
    05-19-2008, 07:12 PM Go to last post
  54. sample size for a probit analysis

    Hi there, I am conducting a hydrocarbon toxicity research using mosquito larvae as target. The idea of this research is to estimate the relative...

    Started by amaoago‎, 07-07-2010 06:08 PM
    • Replies: 0
    • Views: 4,547
    07-07-2010, 06:08 PM Go to last post
  55. Question finding non-randomness in binomial successes?

    Hi, I've only had one semester of Stats, so this is probably a real newbie question. I'm having problems on deciding how to approach a specific...

    Started by amarkb‎, 01-02-2006 03:10 PM
    • Replies: 7
    • Views: 3,309
    01-04-2006, 08:04 AM Go to last post
  56. URGENT help needed

    A company are searching for 5 oil wells in a landscape the sucess rate of finding a hole is 10% (0.1) for each hole therefore failure must be 90%...

    Started by amavadia‎, 05-02-2007 08:26 AM
    • Replies: 1
    • Views: 2,050
    05-02-2007, 09:50 AM Go to last post
  57. 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: 2,709
    05-09-2011, 11:55 AM Go to last post
  58. Expected Value of (1/N)

    Someone rolls a pair of dice repeatedly until the first time a sum of eleven shows. Let N be the number of rolls required. Find E(1/N). So N is a...

    Started by amazedmango‎, 05-08-2011 06:17 PM
    • Replies: 2
    • Views: 5,544
    05-10-2011, 04:26 AM Go to last post
  59. A box contains 5 tickets

    A box contains fives tickets, each with a letter on it: Box : S T A R T Once a day, for n days, a ticket will be drawn at random, with...

    Started by amazedmango‎, 05-08-2011 07:08 PM
    • Replies: 1
    • Views: 3,002
    05-10-2011, 04:35 AM Go to last post
  60. Question Uniform Distribution/Probability Density Function

    I'm experiencing a mental block with this concept. If anyone could help me out, I'd be most appreciative. I understand the formula for the...

    Started by ambiguous325‎, 11-29-2005 02:00 PM
    • Replies: 3
    • Views: 9,956
    11-29-2005, 09:29 PM Go to last post

+ Post New Thread
Page 4 of 91 FirstFirst 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 54 ... LastLast

Thread Display Options

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Order threads in...

Note: when sorting by date, 'descending order' will show the newest results first.

Icon Legend

Contains unread posts
Contains unread posts
Contains no unread posts
Contains no unread posts
More than 15 replies or 300 views
Hot thread with unread posts
More than 15 replies or 300 views
Hot thread with no unread posts
Closed Thread
Thread is closed
Thread Contains a Message Written By You
You have posted in this thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts






Advertise on Talk Stats