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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: 30,315
    09-30-2005, 09:44 AM Go to last post
  1. Uniform distribution on a triangle

    Hi All! So happy to find this site! If (x,y) is the value of the random vector (X,Y) and is uniformly distributed over the triangle with vertices...

    Started by ladyluck‎, 12-01-2010 07:50 PM
    • Replies: 10
    • Views: 12,079
    12-03-2010, 03:38 PM Go to last post
  2. differences between one-tailed and two-tailed P-value

    I am doing hypothesis testing using t-test and p-value. I calculate my p-value based on the degrees of freedom and the t-test value. The p-value is a...

    Started by lgarcia‎, 04-11-2010 01:33 PM
    • Replies: 9
    • Views: 12,063
    04-12-2010, 09:51 PM Go to last post
  3. approximating binomial distribution w/ normal distribution

    Hi all, I'm stuck on the following problem: The percentage of fat in the bodies of American men is an approximately normal random variable with...

    Started by fiddlestix327‎, 06-24-2008 02:11 PM
    • Replies: 2
    • Views: 11,988
    06-25-2008, 06:45 PM Go to last post
  4. Binomial Distribution

    I really need help with this homework. I've been on one question for over an hour. The Question is The rates of on-time flights for commercial...

    Started by PitaTheGreat‎, 03-05-2012 06:33 PM
    binomial distribution, probability
    • Replies: 9
    • Views: 11,972
    03-05-2012, 07:24 PM Go to last post
  5. Expected Value of pmf

    I am currently preparing for my upcoming actuary p/1 exam. The following question was in an book I am using:...

    Started by lovinash‎, 06-26-2009 02:15 AM
    • Replies: 4
    • Views: 11,958
    06-26-2009, 04:09 PM Go to last post
  6. standard deviation of a ratio of dependent variables

    Hi- I have a function (ratio essentially) r= x / (1-x) I need some way of expressing the error of r ... I've experimentally measured x and...

    Started by tronsister‎, 11-26-2008 04:28 PM
    • Replies: 2
    • Views: 11,908
    11-27-2008, 04:54 AM Go to last post
  7. http://en.wikipedia.org/wiki/27_Club

    There does seem to be a causal relationship between occupation and death, but why at 27? Does it mean anything?

    Started by Outlier‎, 07-23-2011 05:48 PM
    • Replies: 11
    • Views: 11,903
    07-29-2011, 09:20 AM Go to last post
  8. Anderson-Darling test appropriate?

    Hi, I have a large (>2500) number of z-scores and I want to test if the distribution of these deviates from a unit normal distribution. I have...

    Started by rhayman‎, 09-14-2010 03:17 AM
    • Replies: 6
    • Views: 11,851
    10-17-2010, 10:04 PM Go to last post
  9. If X ≤ Y, then E(X) ≤ E(Y)

    There is a theorem that says: "Let X and Y be random variables. If X ≤ Y, then E(X) ≤ E(Y)." But I don't really understand the meaning of "X ≤...

    Started by kingwinner‎, 07-08-2009 06:20 PM
    • Replies: 3
    • Views: 11,831
    07-08-2009, 09:09 PM Go to last post
  10. 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: 11,823
    02-03-2010, 12:44 AM Go to last post
  11. What is the process spread ?

    Here's the question: Fifty measurements were taken to determine the weights of filled ice cream containers. The average of these measurements is...

    Started by greyghost‎, 07-23-2008 06:47 AM
    • Replies: 2
    • Views: 11,819
    07-23-2008, 07:12 AM Go to last post
  12. 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: 11,809
    10-08-2010, 03:00 PM Go to last post
  13. Dirichlet distribution - moments (mean and variance)

    For a Dirichlet variable, I know the means and covariances, that is, E = \alpha_i/\alpha_0 Cov =\frac{ \alpha_i (\alpha_0 I -...

    Started by boot20‎, 10-28-2011 05:29 PM
    • Replies: 12
    • Views: 11,806
    02-14-2012, 10:56 AM Go to last post
  14. Is it binomial probability?

    Affirmative action commitments by industrial organizations have led to an increase in the number of women in executive positions. Satellite Office...

    Started by dannygina‎, 10-30-2009 08:11 AM
    • Replies: 1
    • Views: 11,771
    10-30-2009, 08:36 PM Go to last post
  15. deriving expected value of negative binomial distribution

    Hey all, I've derived the expected value of the binomial distribution, but I can't seem to figure it out for the negative binomial distribution....

    Started by vince‎, 05-13-2007 07:50 PM
    • Replies: 0
    • Views: 11,759
    05-13-2007, 07:50 PM Go to last post
  16. Integrating a probability out

    I really do not know & understand about integrating out a probability, in fact I really do not understand the phrase integrate something out. The...

    Started by PeterVincent‎, 05-09-2010 08:59 AM
    • Replies: 2
    • Views: 11,735
    09-25-2010, 01:47 PM Go to last post
  17. Beginning Bayes problem

    I'm getting about every other question right, and since the back of the book only has answers, not whole solutions, I can't tell what I'm doing...

    Started by Turbowaffle‎, 09-27-2006 12:18 PM
    • Replies: 1
    • Views: 11,687
    09-27-2006, 06:24 PM Go to last post
  18. Probability question

    I read the sticky in this section about trying the problem before posting the question but I don't know where to begin on this problem. Any help...

    Started by USMstudent85‎, 04-03-2011 12:47 PM
    • Replies: 14
    • Views: 11,658
    04-03-2011, 04:15 PM Go to last post
  19. Figure out if there is any statistical significance

    Hi - I have some data on the internal temperature of cooked meat. The meat patty is a failure if the temperature obtained is below a certain...

    Started by mulamootil‎, 05-19-2010 07:13 PM
    • Replies: 8
    • Views: 11,646
    06-10-2010, 01:27 PM Go to last post
  20. 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: 11,622
    07-07-2012, 12:07 PM Go to last post
  21. Probability of radar detection

    Aircraft is in certain area, radar correctly registers its presence with prob. of 0.95. If it is not present, radar falsely registers its presence...

    Started by gator78‎, 10-09-2010 10:47 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 11,460
    10-11-2010, 02:39 PM Go to last post
  22. Math Symbols - R1 --> R2

    What does the symbol R mean in the following description: "Let X be a discrete random variable, and let g : R^1 -> R^1 be some function ... " ...

    Started by simplemts‎, 10-07-2012 12:11 AM
    • Replies: 4
    • Views: 11,448
    10-07-2012, 12:34 AM Go to last post
  23. 2 four sided dice, probability of 1 dice = 3, sum = even

    2 four tetrahedral dice with sides, 1,2,3,4. the two dice are thrown, what is the probability that given the first dice is a 3, the sum of the 2...

    Started by Hans Rudel‎, 04-24-2012 04:19 AM
    2 dice, conditional probability
    • Replies: 1
    • Views: 11,341
    04-24-2012, 08:56 AM Go to last post
  24. ex(xy)

    Hi, i can't figure out how do i calculate e(xy) in cases they are not independent and lets say they have the same distribution, for instant...

    Started by zhenyazh‎, 01-06-2010 01:47 AM
    • Replies: 1
    • Views: 11,322
    01-08-2010, 08:36 AM Go to last post
  25. simple coin flip problem

    hi, I recently discovered this forum and I think this could help me with my stats courses... I havent received the text book yet, so my first...

    Started by Logman‎, 09-30-2006 11:52 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 11,286
    10-23-2006, 09:09 AM Go to last post
  26. How to find std. dev. of Probability Distribution using Excel? Help please.

    Hello, I can find the Population std. dev. using the formula and my BAII plus calc, but would like to know how to find the same using an Excel...

    Started by pcampin‎, 12-15-2011 02:10 PM
    • Replies: 1
    • Views: 11,162
    12-15-2011, 02:26 PM Go to last post
  27. Using Taylor expansion for calculating Expected Value

    Hello, This question is motivated by a very helpful approach suggested by BGM for solving an expected value estimation problem recently posted on...

    Started by 1stone‎, 04-04-2011 01:10 PM
    • Replies: 1
    • Views: 11,097
    04-04-2011, 02:15 PM Go to last post
  28. Chebyshev's theorem and empirical rule

    can someone please explain how to do this problem? I am so confused! Assume the distribution of weights of US adults are normally distributed...

    Started by vintageglam09‎, 12-09-2008 02:20 AM
    • Replies: 5
    • Views: 11,073
    12-10-2008, 02:04 PM Go to last post
  29. Lickert scale mean median mode?

    How do we find a 5 point lickert scale data`s mean median mode? is it possibl? I am not familiar with lickert scale data analysis, and yet I have to...

    Started by SadieKhan‎, 08-12-2010 04:52 PM
    • Replies: 6
    • Views: 11,046
    08-13-2010, 03:36 AM Go to last post
  30. Performing a blood analysis

    To perform a certain type of blood analysis the lab tech must perform two procedures. First procedures requires either 1 or 2 steps and the secound...

    Started by NikNice‎, 10-09-2005 04:32 PM
    • Replies: 1
    • Views: 10,993
    10-09-2005, 04:41 PM Go to last post
  31. plotting a CDF from PDF

    I am trying to plot the CDF from the pdf given: f(x) = 1 + x , -1 <x ≤ 0 f(x) = 1 - x , 0 < x < 1 f(x) = 0 , otherwise So I...

    Started by maybe‎, 03-09-2011 07:19 PM
    • Replies: 11
    • Views: 10,988
    03-10-2011, 04:21 PM Go to last post
  32. Normal Distribution

    An individuals’ heights are normally distributed with mean 70 and standard deviation 3 (inches). a) What proportion of the population is...

    Started by SmileAli‎, 04-23-2010 05:16 PM
    • Replies: 4
    • Views: 10,981
    04-24-2010, 01:34 AM Go to last post
  33. Post Symbols in statistics

    x^n x to the power of n, x^2 is x squared nPr Permutation, nPr = n!/(n-r)! nCr Combination, nCr = n!/(r!(n-r)!) P(A|B)

    Started by quark‎, 11-07-2005 04:11 PM
    • Replies: 0
    • Views: 10,958
    11-07-2005, 04:11 PM Go to last post
  34. Question MLE of range of Uniform(a,b)

    So, I want an MLE for (b - a). log L(a,b|x) = -n log (b - a) given a < x_(1) and b > x_(n) but d/da log L gives me n/(b-a) >, and in fact =/=...

    Started by conundrum‎, 03-16-2011 06:47 PM
    mle, mvue, uniform
    • Replies: 9
    • Views: 10,902
    03-17-2011, 12:13 PM Go to last post
  35. conditional probability

    The table below displays data the First Bank of Silverhaven (FBS) has collected on the personal savings accounts of its job-holding customers. The...

    Started by likewhat22‎, 07-04-2012 09:45 PM
    probability
    • Replies: 3
    • Views: 10,891
    10-22-2013, 12:40 PM Go to last post
  36. Joint probability distribution

    1. An instructor has given a short test consisting of two parts. For a randomly selected student, let X = the number of points earned on the rst part...

    Started by boydale1‎, 10-11-2009 05:05 PM
    • Replies: 1
    • Views: 10,820
    10-11-2009, 07:28 PM Go to last post
  37. Prob: Normal probability distribution

    The mean cost of domestic airfares in the United States rose to an all-time high of $385 per ticket (Bureau of Transportation Statistics website,...

    Started by kp2‎, 10-07-2014 07:12 PM
    • Replies: 1
    • Views: 10,757
    10-07-2014, 07:39 PM Go to last post
  38. 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: 10,569
    03-08-2011, 01:43 AM Go to last post
  39. 'Shifted' Poisson Processes?

    Hi all. I’m a graduate student in ops research, but my research is in the optimization side of things more so than the stochastic processes. I...

    Started by TeoNichelli‎, 05-17-2013 03:22 PM
    • Replies: 2
    • Views: 10,562
    05-18-2013, 03:05 PM Go to last post
  40. Find the value of x

    I am having trouble finding the value of x with this problem, because my teacher's example problems are a lot different! The question is A new...

    Started by tiffnnie01‎, 10-15-2008 03:06 PM
    • Replies: 1
    • Views: 10,555
    10-15-2008, 10:18 PM Go to last post
  41. Keno or LOTTO style

    So, here is how the game goes. suppose that the game uses the numbers 1 through 50 and suppose that the operator selects eight of these. If the...

    Started by panz‎, 02-06-2006 05:41 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 10,553
    09-27-2006, 04:41 PM Go to last post
  42. Probability Help.

    Im not sure why I can't figure out these 2 problems. I got the first one right, and I'm using the same thought process to do the other 2, I just...

    Started by weedy1990‎, 06-15-2012 01:23 PM
    • Replies: 8
    • Views: 10,552
    06-15-2012, 06:22 PM Go to last post
  43. Difference of two Gaussian RV's

    Haven't done stats in awhile and now im stuck in a class and im the only undergrad. :confused: If I could get some guidance I could probrabaly...

    Started by HHB‎, 01-11-2011 06:18 PM
    • Replies: 8
    • Views: 10,443
    01-11-2011, 09:28 PM Go to last post
  44. Prob w/Combination of At Least AND Combination

    I'm stuck on this. I've had similar probs, but none that combine the At Least with this type of selection. I really hate to ask for help on a...

    Started by ckbeme‎, 04-21-2006 05:40 PM
    • Replies: 5
    • Views: 10,441
    04-23-2006, 08:38 AM Go to last post
  45. Joint probability distribution functions

    So a joint pdf is of the form P(X,Y) = SS f(x,y) dx dy, where 'S' is the integral symbol. I've got to cook up the pdf for f(x,y), where X and Y...

    Started by Aegis‎, 10-23-2006 11:24 PM
    • Replies: 3
    • Views: 10,395
    10-25-2006, 07:34 PM Go to last post
  46. Poisson. Calculate expected frequency problem.

    I've decided to brush up on my statistics recently by jumping right in the middle of it, and I landed on the normal distribution. I have this...

    Started by Cronos‎, 06-12-2009 07:06 AM
    • Replies: 4
    • Views: 10,353
    06-15-2009, 09:07 AM Go to last post
  47. Is a subset of a normal distribution normal?

    An easy one for some of you guys here I suspect. Thanks to anyone who can help me with it. I have an application which adds a normally...

    Started by bordonbert‎, 10-27-2009 10:39 AM
    • Replies: 4
    • Views: 10,322
    10-29-2009, 03:54 AM Go to last post
  48. Joint Probability Distribution

    Hello all! Having a bit of problems here with making the table for a joint distribution: Question: 3 Fair coins are tossed. Let X = #of heads in...

    Started by jamesmartinn‎, 02-27-2009 05:49 PM
    • Replies: 6
    • Views: 10,313
    02-27-2009, 07:51 PM Go to last post
  49. Match odds versus overall odds of winning in horse racing

    The problem I have is as follows. Take a horse race with multiple entrants. Assume that I can accurately assess the probability of horse X...

    Started by Onionman‎, 12-04-2008 11:29 AM
    • Replies: 5
    • Views: 10,310
    12-10-2008, 02:44 PM Go to last post
  50. Dice probability - at least 2 's out of ten

    Hi If I roll a fair dice 10 times, what is the probability of getting at least two 6's? edit: Which method shall I use? Say, it's at least 3...

    Started by lorenzo‎, 12-17-2008 07:09 AM
    • Replies: 1
    • Views: 10,279
    12-17-2008, 09:23 PM Go to last post
  51. Random probability distribution for demand

    Hi All, I have a sample of 100 items with a specific daily expected demand probability. Average demand for a day is 4 (without repetition). I have...

    Started by sach_83‎, 12-28-2010 07:43 AM
    • Replies: 10
    • Views: 10,278
    12-29-2010, 12:22 PM Go to last post
  52. Finding probability with given mean and standard deviation

    Hi, I have tried to do this using the z value method but I'm not even sure if I'm right. The question is: "The recommended total blood cholesterol...

    Started by k1mpossible‎, 03-19-2013 05:14 AM
    probability help, statistics course
    • Replies: 4
    • Views: 10,264
    03-23-2013, 12:42 PM Go to last post
  53. Finding E[X] and Var[X] of exponential distribution

    Transistors produced by one machine have a lifetime which is exponentially distributed with mean 100 hours. Those produced by a 2nd machine have an...

    Started by StatStudent3‎, 10-18-2010 09:23 AM
    • Replies: 7
    • Views: 10,212
    10-19-2010, 12:23 PM Go to last post
  54. The Minimum of n Independent Normal Distributions

    This is a very good article, on the subject of the distribution of the minimum of several random variables, by Joshua Hill: ...

    Started by kajamix‎, 07-09-2010 02:15 PM
    • Replies: 2
    • Views: 10,207
    07-10-2010, 03:47 AM Go to last post
  55. Question Cumulative Distribution Function

    Please help me, I have 2 cases: 1. n is positive constant and defined by function f(x)=1/2.n.e^(-n.x) if x>=0 and f(x)=1/2.n.e^(-n.x) if x<0....

    Started by statjunior‎, 10-19-2010 10:59 PM
    • Replies: 8
    • Views: 10,203
    10-26-2010, 01:37 AM Go to last post
  56. probability question with percentage of sales

    (I accidentally posted this in the statistics forum so I am moving it over here.) I have worked on solving the problem below for over an hour and...

    Started by ealeql‎, 02-25-2010 02:56 PM
    • Replies: 3
    • Views: 10,202
    02-25-2010, 08:50 PM Go to last post
  57. Intercept variable in Excel regression test

    Hi, I am running a regression test to see the relationship between free cash flow (FFO) and Stock Price of a few companies, using Excel. (Stock...

    Started by musicgold‎, 12-12-2008 01:25 PM
    • Replies: 3
    • Views: 10,195
    12-12-2008, 09:20 PM Go to last post
  58. Smile Probability question making my brain hurt :p

    "suppose you know that a friend of yours has two children and that at least one of them is a boy. One day, you visit your friend's house and his son...

    Started by clairethackray‎, 03-17-2014 11:14 PM
    • Replies: 1
    • Views: 10,145
    03-18-2014, 03:22 AM Go to last post
  59. Help to find the joint density function.

    Hi, Can someone please help me find the joint density function f(y1,y2) for the given problem. Suppose that Y1 and Y2 are uniformly distributed...

    Started by MonitorStats‎, 04-04-2009 06:32 AM
    • Replies: 3
    • Views: 10,058
    04-04-2009, 11:59 PM Go to last post
  60. independent and disjoint

    If C and D be independent events which are disjoint. What can we said about their probabilities?? i know C, D are independent so P(C n D)=P(C)...

    Started by xixihaha‎, 11-28-2008 03:33 PM
    • Replies: 6
    • Views: 10,047
    11-29-2008, 02:10 PM Go to last post

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