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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: 30,195
    09-30-2005, 09:44 AM Go to last post
  1. I have a probability question!

    help please.. I don't know how to find P(x) The BREAKOUT OF FACULTY MEMBERS FROM THE MS&E Divison Suppose that three faculty members are chosen...

    Started by ptrrr‎, 10-13-2010 03:10 PM
    • Replies: 12
    • Views: 4,058
    03-17-2013, 11:07 AM Go to last post
  2. Combine Normal Distributions

    How do you combine multiple normal distributions with different standard deviations and means, to produce one representative normal distribution? ...

    Started by x46949‎, 05-01-2011 03:23 PM
    • Replies: 12
    • Views: 20,711
    01-26-2013, 12:51 AM Go to last post
  3. 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: 4,371
    08-25-2011, 02:09 PM Go to last post
  4. 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: 7,854
    10-05-2011, 09:36 PM Go to last post
  5. 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: 11,746
    02-14-2012, 10:56 AM Go to last post
  6. Two quick problems:

    Hey guys, having a bit of trouble and can't find anyone to double check my work: Mean failure rate of a communication is 1 error per 10 000 000...

    Started by johnstamos‎, 11-06-2011 06:28 PM
    • Replies: 12
    • Views: 2,628
    11-06-2011, 11:37 PM Go to last post
  7. [SOLVED] Need help with a problem that I THINK requires Bayes Theorem....

    For the combined ELISA-Western blot blood test for HIV positive status, the sensitivity is about 0.999 and the specificity os about 0.9999. Consider...

    Started by kelly g‎, 01-27-2012 09:07 PM
    • Replies: 12
    • Views: 6,917
    01-28-2012, 03:33 PM Go to last post
  8. Exclamation Probability for functional combination of normal distributed random variable

    Hey folks, i am searching for a method to get the probability of a functional combination of normal distributed random variables, here is an...

    Started by Greyman‎, 02-25-2012 04:41 PM
    • Replies: 12
    • Views: 3,583
    02-27-2012, 12:43 PM Go to last post
  9. Probability (compound event)

    Question: the event A&B are such that P(A)= x+.2 P(B)= 2x + .1 P(AnB)=x a) Given that P(AuB)= .7 find the value of x OK I DON'T EXPECT ANYONE...

    Started by cushane‎, 02-27-2012 06:07 PM
    • Replies: 12
    • Views: 2,682
    02-27-2012, 07:56 PM Go to last post
  10. Could someone please help? Probability of sampling error?

    This is one concept I cannot understand. I'm studying for a test and loathe the probability chapter. Here is the problem and I following all of the...

    Started by mnb124‎, 04-14-2012 05:56 PM
    • Replies: 12
    • Views: 5,510
    04-15-2012, 06:45 AM Go to last post
  11. E(X) , Cov(aX,bY)

    Let X and Y be random variables with the density f(x) such that f(X)=1 for 0<x<1 and f(x)=0 for x<0 and x>1. We have that Var(x) = Var(Y). 1)...

    Started by saternal‎, 04-23-2012 10:14 AM
    • Replies: 12
    • Views: 14,119
    04-24-2012, 08:52 PM Go to last post
  12. Polyp probability

    some help would be greatly appreciated, this should be easy for people here, but unfortunately i am bad with this stuff. 15 polyps are discovered...

    Started by intric8‎, 06-25-2012 09:17 AM
    • Replies: 12
    • Views: 2,431
    06-27-2012, 12:15 AM Go to last post
  13. Sampling Distributions help

    Hi, I'm teaching myself stats but have no idea on how to solve these, any help would be appreciated. When a pizza restaurantís delivery process is...

    Started by franklinexpress‎, 11-25-2012 03:34 PM
    distribution, sampling
    • Replies: 12
    • Views: 1,722
    11-26-2012, 11:07 AM Go to last post
  14. Radio Competition - HELP NEEDED!

    Hi, I'm a producer on a big (US) Radio station. I'm developing a new competition, but I need help with the probability... The game is simple...

    Started by ProducerGeoff‎, 05-30-2013 05:58 AM
    simulate
    • Replies: 12
    • Views: 2,024
    05-30-2013, 04:12 PM Go to last post
  15. Balls in a jar

    I wonder if my approach to this is correct- Say I have a jar with 10 balls, 9 of which are green and 1 that is red. I start taking out a ball at a...

    Started by fiffette‎, 08-26-2013 12:06 PM
    • Replies: 12
    • Views: 3,018
    08-27-2013, 11:14 AM Go to last post
  16. Probability of selecting two different colored balls

    Given an urn with x red balls, and y green balls, thoroughly mixed, what is the probability of choosing two colors in the first two picks, when the...

    Started by Daddii‎, 02-23-2014 01:45 PM
    probability, replacement, selection
    • Replies: 12
    • Views: 2,823
    02-25-2014, 10:20 PM Go to last post
  17. Number serviceable at given time

    If I have 50 systems each operating 400 hours per year with an MTBF of 900 hours how do I calculate how many would be serviceable at one time?...

    Started by brif‎, 07-24-2014 07:46 AM
    • Replies: 12
    • Views: 2,548
    07-28-2014, 08:40 AM Go to last post
  18. Convergence

    If Z_n = \frac{1}{n}*\sum_{i=1}^nX_i^2 where X_i=N(\mu,\sigma^2) 1) Show that Z_n \rightarrow^p \mu^2+\sigma^2(convergence in probability) I...

    Started by askazy‎, 12-03-2014 04:50 PM
    • Replies: 12
    • Views: 2,198
    12-06-2014, 10:46 AM Go to last post
  19. Help solving probability scenario

    I play in a pool league and 4 of my teammates and I were busy practicing when we happened across an interesting scenario: Between 5 of us we...

    Started by FordLaz‎, 03-13-2015 11:11 AM
    • Replies: 12
    • Views: 2,261
    03-17-2015, 06:29 AM Go to last post
  20. Random numbers

    Hello, let me go direct to point: Let's say i have a total of 60 numbers (1-60) and i can generate 6 random numbers among them, in this case: 5,...

    Started by msw‎, 06-01-2015 01:28 AM
    • Replies: 12
    • Views: 2,229
    07-22-2015, 08:00 AM Go to last post
  21. False positives

    Hi everyone, This is my first post and had a basic (I think) question. Are false positives by definition a conditional probability? I was...

    Started by JFish‎, 08-11-2016 07:05 PM
    • Replies: 12
    • Views: 2,045
    08-14-2016, 01:38 AM Go to last post
  22. Generating a dataset with normal distribution acc. to K-S-test and S-W-test in SPSS

    Iím writing a paper on regression analysis in SPSS, and the data set of the outcome variable is assumed to be normally distributed. Itís a...

    Started by Morten67‎, 12-01-2016 01:22 PM
    • Replies: 12
    • Views: 3,273
    12-02-2016, 12:44 PM Go to last post
  23. Unhappy Calculating z value/mean and standard deviation

    Hi...have completed my assignment (and have come a long way with some helpful tips on this forum) but am stuck on one problem: In grading apples...

    Started by ShannonL‎, 11-05-2005 11:25 PM
    • Replies: 11
    • Views: 42,517
    01-07-2006, 10:22 PM Go to last post
  24. Normal distribution probability density function returning values > 1

    i am trying to draw a normal curve over a histogram of some data of mine and i just can't get it to come out right! Mean =1.002327404 Standard...

    Started by method‎, 10-02-2008 11:27 AM
    • Replies: 11
    • Views: 6,356
    10-03-2008, 04:50 PM Go to last post
  25. Cossing Toins-Probability

    If I toss 10 coins, how do I find the probability that 8 of them will land on heads? Could someone help me out?

    Started by pc678‎, 10-07-2008 08:02 PM
    • Replies: 11
    • Views: 2,972
    10-08-2008, 10:14 AM Go to last post
  26. Question Samples from uniform distributions

    L.S. For an internship I'm stuck with a nasty, statistical problem, so I decided to join this forum and let you guys have a go at it. Evidentily...

    Started by maartmeester‎, 08-17-2009 04:01 AM
    • Replies: 11
    • Views: 3,030
    09-08-2009, 12:14 PM Go to last post
  27. I'm a pure mathematician. HELP!

    Hi, As the title says I'm a pure mathematician. Sorry for the non specific title of the thread, I don't know what the following problem should be...

    Started by gccd‎, 09-10-2009 06:45 PM
    • Replies: 11
    • Views: 3,760
    09-18-2009, 12:30 PM Go to last post
  28. count of integers in sliding window

    Hi all, I'm looking to generate a series of integers in the range , that start off with a large spacing, like 2 50 101, etc. At a peak of some...

    Started by discoross‎, 12-18-2009 03:45 AM
    • Replies: 11
    • Views: 5,629
    02-26-2010, 06:29 AM Go to last post
  29. Angry Bayesian kills me

    I have been practicing this Bayesian thing as you can tell.. so here I have made another attempt to get my concepts clear, If the pre-test...

    Started by SadieKhan‎, 09-22-2010 04:12 PM
    • Replies: 11
    • Views: 3,858
    09-23-2010, 12:54 AM Go to last post
  30. Cumulative distribution help.

    Okay so I've got this question: Let X be a random variable with a cumulative distribution function Fx. Prove that P(x=a) = 0 if and only if Fx is...

    Started by c2q‎, 10-10-2010 08:10 PM
    • Replies: 11
    • Views: 5,977
    10-11-2010, 06:25 PM Go to last post
  31. Unhappy help me please

    Hello, I would like to know if someone can help for the question as below? Suppose that P(E) is 0 or 1, show that E is independent of all...

    Started by ms&ms‎, 10-24-2010 04:30 PM
    • Replies: 11
    • Views: 3,844
    11-01-2010, 12:25 PM Go to last post
  32. Angry help with dirichlet distribution

    I am stuck on this problem I have to prove its a density I can do it by show it by integrating it twice with respect to X2 and X1 and it...

    Started by omega‎, 10-31-2010 01:22 PM
    • Replies: 11
    • Views: 3,911
    10-31-2010, 06:15 PM Go to last post
  33. Dependent or Independent

    Hello, I am asked the following in an assignment: Let A be the event that a letter picked at random from a piece of English text is T and let B...

    Started by jocali‎, 11-01-2010 05:41 PM
    • Replies: 11
    • Views: 4,655
    11-03-2010, 12:57 PM Go to last post
  34. 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: 10,894
    03-10-2011, 04:21 PM Go to last post
  35. 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: 11,854
    07-29-2011, 09:20 AM Go to last post
  36. Simple Question

    Hi all, I got stuck with a simple question. Thanks in advance for your response. The question is: X_i 's follow i.i.d standard normal rvs. ...

    Started by vinux‎, 07-25-2011 08:22 AM
    • Replies: 11
    • Views: 2,861
    07-26-2011, 11:36 AM Go to last post
  37. 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: 9,620
    09-15-2011, 03:08 AM Go to last post
  38. 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: 8,710
    10-17-2011, 12:06 AM Go to last post
  39. Joint Probability Issues

    I'm trying to prepare for a test and going over some practice problems I just found with no solutions, and they've basically led me to believe I'm...

    Started by sumpmeh‎, 11-21-2011 12:40 PM
    dice, exponential distribution, joint probabilities, joint probability
    • Replies: 11
    • Views: 3,013
    12-02-2011, 09:53 AM Go to last post
  40. Binomial probability

    Hello!! My question is: Only 30% of the people in a large city feel that mass transit system is adequate. If 20 different persons are selected at...

    Started by kelly g‎, 03-10-2012 03:42 PM
    • Replies: 11
    • Views: 4,142
    03-10-2012, 06:57 PM Go to last post
  41. Hopefully Simple Question

    I've been out of school too long to remember how to do this but, my friend, a principal had brought up an interesting convo about some of his...

    Started by kmind‎, 05-01-2012 02:10 PM
    • Replies: 11
    • Views: 3,692
    05-02-2012, 03:11 PM Go to last post
  42. Stuck on Algebraic Proof

    Hi, I am trying to algebraically prove the following statement: (n-k+1) ((n) c (k-1)) = k ((n) c (k)). The following are the steps I have down on...

    Started by S-C-3-1-3‎, 09-10-2012 04:46 PM
    • Replies: 11
    • Views: 2,676
    09-10-2012, 07:00 PM Go to last post
  43. Question Involving Both a Die and Coin

    Hi, I am having difficulties with this probability question and would love some feedback to see if I am thinking this through correctly: ďA die...

    Started by S-C-3-1-3‎, 09-09-2012 12:24 AM
    • Replies: 11
    • Views: 2,605
    09-12-2012, 08:41 AM Go to last post
  44. 2 statistical bioresearch problems

    Hello guys, I require your help in my research project. Problem 1: We are filtering a suspension of 1ml containing 1250 cells, through a...

    Started by Mandokir‎, 09-21-2012 03:28 AM
    • Replies: 11
    • Views: 2,762
    09-25-2012, 02:54 PM Go to last post
  45. Finding probability of left and right handed people

    Hello, I am lost on these problems: Assume that 13% of people are left-handed. If we select 10 people at random, answer the following questions: ...

    Started by dina786‎, 10-01-2012 06:14 PM
    • Replies: 11
    • Views: 8,977
    10-02-2012, 10:29 AM Go to last post
  46. Proving an assertion on sigma-algebras

    Hi there :) I have a problem with solving this question: If \mathcal{A} is a \sigma-algebra defined on \Omega and B \subset \Omega is an...

    Started by andiii‎, 11-04-2012 04:58 PM
    • Replies: 11
    • Views: 1,773
    11-04-2012, 11:35 PM Go to last post
  47. Poisson Distribution Help

    Hey, I need some help with the following exercise (big test on Sunday). Q: A lab researching cancer cells found that transformed epithelial...

    Started by HadasL‎, 10-01-2013 10:00 AM
    • Replies: 11
    • Views: 2,239
    10-01-2013, 11:33 AM Go to last post
  48. Odds & Probabilities

    My 8 year old grandson is fascinated by the NFL playoffs. We were looking at a website that showed the odds of winning the Super Bowl for each of 12...

    Started by Jennifer Murphy‎, 01-07-2014 01:18 PM
    • Replies: 11
    • Views: 1,953
    01-08-2014, 04:29 AM Go to last post
  49. a question about discrete RV

    hello, I have a question about discrete RV. Five fair coins are tossed. The coins that fall on "Head" are removed and the rest of them are tossed...

    Started by avsha43‎, 08-07-2014 03:56 PM
    • Replies: 11
    • Views: 1,687
    08-08-2014, 07:38 AM Go to last post
  50. Brain Teaser

    It's here:http://www.braingle.com/palm/teaser.php?id=29228&comm=1 I thought that surely the answer must be 0.5 until I considered writing a test...

    Started by ArtK‎, 09-06-2014 08:47 AM
    • Replies: 11
    • Views: 3,243
    09-08-2014, 11:43 PM Go to last post
  51. Probability of k pairs of birthdays in a group of n people

    Could somebody please tell me the formula for computing the probability that exactly k pairs will have the same birthday out of a group of n people? ...

    Started by Leo Simon‎, 11-30-2014 05:50 PM
    birthday problem
    • Replies: 11
    • Views: 3,460
    12-02-2014, 10:24 AM Go to last post
  52. Please help calculate the odds of this

    First off, let me say I know very little about math and even less about probabilities. I am a father of two teenage boys. One of them gave me a...

    Started by acofgb‎, 12-22-2014 12:55 PM
    • Replies: 11
    • Views: 2,159
    12-23-2014, 05:42 PM Go to last post
  53. Probability to win

    Hello, I would like to calculate the probability to win 3 times in a lottery considering the following: 1 - the chance to win 1 time is 1 in...

    Started by Marcus5800‎, 05-24-2015 07:21 PM
    lottery
    • Replies: 11
    • Views: 1,604
    05-25-2015, 01:54 PM Go to last post
  54. Help Settle and Argument re: Chance of Failure in Fantasy Football

    Hi, all! I'm new, so please accept my apologies in advance for... whatever. So here's the question. In a fantasy football league, there are...

    Started by nieltown‎, 08-25-2015 09:57 AM
    independent, probability, stupid
    • Replies: 11
    • Views: 1,691
    08-25-2015, 12:16 PM Go to last post
  55. Why doesent MLE equal in normal distribution when mean = variance?

    Sadly Iīm not familiar with LaTex so I have attached my question as a picture. I have tried the best I can, but now Iīm stuck :(

    Started by pmle‎, 03-10-2016 11:47 AM
    • Replies: 11
    • Views: 1,853
    03-12-2016, 01:24 AM Go to last post
  56. Poisson Distribution Question

    I am using the Poisson distribution model the determine the probability of an event occurring. I know that the mean of the event occurring is 7. ...

    Started by Relentless‎, 10-31-2005 11:11 PM
    • Replies: 10
    • Views: 7,303
    11-01-2005, 12:17 PM Go to last post
  57. stuck on probability

    I'm just about done my 2nd assignment and find when I stay at it too long I start to space-out on some of even the more seemingly easier items. I...

    Started by greenatstats‎, 11-06-2005 10:13 PM
    • Replies: 10
    • Views: 4,787
    11-07-2005, 05:48 PM Go to last post
  58. Exclamation Please Help! I am really stuck on some problems....

    During the past forty years, the monthly rate of return of stocks has been approximately normally distrubuted, with u=0.75 percent and sigma=4.2...

    Started by Fashion7‎, 11-11-2005 10:47 PM
    • Replies: 10
    • Views: 4,522
    11-14-2005, 11:34 AM Go to last post
  59. Unhappy help with probability questions

    HELPPPPPPPPPPPPPPPPPPPPPPPPPP I am struggling with a introductory stats course, and am in need of some free help on some of my questions plse plse...

    Started by stressed with stats‎, 02-01-2006 11:51 PM
    • Replies: 10
    • Views: 6,922
    02-05-2006, 10:12 AM Go to last post
  60. Permutations with Duplicates

    I have been trying to find information about calculating permutations that include multiple duplicate items, but have only found programming source...

    Started by Peelman‎, 10-18-2006 03:38 AM
    • Replies: 10
    • Views: 21,999
    10-30-2006, 03:34 PM Go to last post

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