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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: 22,681
    09-30-2005, 09:44 AM Go to last post
  1. φ Distribution Table

    Hi, I'm currently looking for the φ distribution table, to calcuate marginal effects in a probit model. Unfortunatly there isn't one in my...

    Started by PaulDaniel‎, 04-15-2011 05:59 AM
    • Replies: 0
    • Views: 179,137
    04-15-2011, 05:59 AM Go to last post
  2. π-system and monotone class

    Assume P is a π-system (that is, P is closed under finite intersections) and M is monotone class (that is M is a non-empty collection of subsets of Ω...

    Started by hadiSanji‎, 12-17-2011 05:50 AM
    probability theory
    • Replies: 3
    • Views: 125,538
    12-17-2011, 10:54 AM Go to last post
  3. 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: 122,311
    10-16-2011, 10:52 PM Go to last post
  4. 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: 112,104
    10-16-2011, 12:42 PM Go to last post
  5. calculation of distance using Kullback–Leibler divergence

    Hi, Basically I'm from biology back ground. So it may be a basic question for you. I have two plots for example plot1: X - axis values: ...

    Started by asd123‎, 03-03-2011 05:39 AM
    • Replies: 2
    • Views: 106,025
    03-03-2011, 09:39 AM Go to last post
  6. Significance Test: Ho & Ha

    Me again :) This is a long assingment I'm working on, and I have another question that I'm doubting my answer on.... This is the question: Q: ...

    Started by mackerbuddy‎, 11-13-2005 06:46 AM
    • Replies: 1
    • Views: 70,888
    11-13-2005, 09:40 AM Go to last post
  7. Finding Mean and Variance for X^2 Given Mean and Variance for X

    I am working on a question that has me stumped. X1, X2, ... Xn are normally distributed and independent. Each has a mean of 0 and variance sigma^2....

    Started by math_guy314‎, 11-05-2010 05:56 PM
    • Replies: 4
    • Views: 59,527
    11-08-2010, 06:47 PM Go to last post
  8. probability with mean and standard deviation

    The local hardware store sells screws in 1lb bags. Because the screws aren't identical, the number of screws per bag, although distributed...

    Started by i need a brain‎, 06-04-2008 05:46 PM
    • Replies: 4
    • Views: 59,189
    03-06-2012, 05:20 PM Go to last post
  9. Help about Isserlis’ theorem

    The Isserlis theorem states that if is a zero mean multivariate normal random vector, then : E = EE + EE + EE Now, in the case x,y,z,t are...

    Started by DejanM‎, 01-30-2012 12:38 PM
    • Replies: 0
    • Views: 57,196
    01-30-2012, 12:38 PM Go to last post
  10. Var(X+Y+Z)

    What is the formula for the variance of 3 dependent variables? For 2 dependent variables, the formula is Var(X)+Var(Y)+2*Cov(X,Y) What is...

    Started by shrek‎, 07-08-2008 02:20 PM
    • Replies: 6
    • Views: 56,928
    02-09-2015, 02:15 AM Go to last post
  11. Help! I’m baffled with a probability problem…..

    Hi, Newby here. I am hoping someone on here can assist with a probability question that’s troubling me. I have three ‘events’, in each event...

    Started by RobD‎, 01-09-2012 09:32 AM
    • Replies: 4
    • Views: 53,686
    01-09-2012, 11:39 AM Go to last post
  12. Probability Problem

    Pls help...........:wave: My problem exercise goes like this - An employee of the records office at a certain school currently has 10 forms on...

    Started by leo‎, 04-10-2008 08:31 AM
    5 Pages
    1 2 3 ... 5
    • Replies: 74
    • Views: 47,493
    06-04-2008, 07:00 PM Go to last post
  13. α = 0.05 vs p-value?

    So I've got a couple questions on my stats homework as follows: E. Canis infection is a tick-bone disease of dogs that is sometimes contracted by...

    Started by ryant‎, 09-29-2012 07:09 PM
    • Replies: 4
    • Views: 42,963
    09-30-2012, 04:51 AM Go to last post
  14. Binomial Probabilities

    These kinds of questions can be answered using the binomial probability distribution: 1. If I flip a coin 20 times, what is the probability of...

    Started by JohnM‎, 11-01-2005 02:50 PM
    • Replies: 0
    • Views: 41,150
    11-01-2005, 02:50 PM Go to last post
  15. 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: 37,925
    01-07-2006, 10:22 PM Go to last post
  16. need assistance

    I am taking a course in safety and now have one class left, but ran into a big problem. This class has statistics and I don't have a clue. The text...

    Started by double‎, 03-01-2006 11:35 AM
    • Replies: 5
    • Views: 34,894
    03-05-2006, 06:23 PM Go to last post
  17. E[MSE] simple linear regression

    Hi All- I am trying to figure out how to prove that MSE = SSE/n-2 is an unbiased estimator of sigma^2 in simple linear regression. I have that...

    Started by B_Miner‎, 10-01-2009 07:42 PM
    sigma^2, unbiased estimator
    • Replies: 14
    • Views: 34,478
    02-02-2013, 03:44 AM Go to last post
  18. Standard Deviation from Percentiles and Mean

    Hello to all and thank you in advance for the help with this. I am working with a lognormal distribution and am given Percentiles - P10, P50, P90,...

    Started by rpmc‎, 06-08-2009 05:07 AM
    • Replies: 7
    • Views: 29,309
    12-23-2010, 02:14 PM Go to last post
  19. Removing an outlier DECREASES correlation??

    Here's my data. Note the "outlier" X LN(X) Y 4 1.386294361 0.107543212 6 1.791759469 3.289563593 7 1.945910149 2.058949066...

    Started by MrGibbage‎, 04-19-2010 01:38 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 28,772
    04-24-2010, 07:17 PM Go to last post
  20. Doesn't "At least" mean greater than

    Thank you for taking the time to read my question :) I was given a question that reads: We would like to test whether the percentage of students...

    Started by ealeql‎, 09-26-2010 05:31 PM
    • Replies: 7
    • Views: 28,533
    09-27-2010, 10:35 AM Go to last post
  21. P-value from test statistic

    I'm given a test-statistic of 2.4 in one of those H0 type problem with a 0.05 significance level. In the z-table, if you look up 2.4, it says 0.0082....

    Started by robbiesqp‎, 12-11-2009 07:02 PM
    • Replies: 8
    • Views: 28,245
    01-01-2015, 10:33 PM Go to last post
  22. M.g.f for Poisson distribution

    Hello, I am having trouble understanding the maths between E(e^{tx}) where I get a summation from 0 to \infty and the m.g.f for Poisson...

    Started by Trillian‎, 01-07-2011 07:26 AM
    mgf, poisson distribution, probability
    • Replies: 2
    • Views: 27,160
    01-07-2011, 01:55 PM Go to last post
  23. show P(N>n)=P(X_(n:n)−X_(1:n)<α)

    suppose X1,X2,… is sequence of independent random variables of U(0,1) if N=min{n>0:X_(n:n)−X_(1:n)>α,0<α<1} that X_(1:n) is smallest order statistic...

    Started by hadiSanji‎, 08-01-2012 08:58 AM
    probability
    • Replies: 0
    • Views: 25,421
    08-01-2012, 08:58 AM Go to last post
  24. The Probability of a Flush

    Hiya :) Im back for some more assistance.... Q: THE PROBABILITY OF A FLUSH A poker player holds a flush when all 5 cards in the hand belong to...

    Started by mackerbuddy‎, 11-14-2005 03:10 AM
    • Replies: 1
    • Views: 25,138
    11-14-2005, 09:45 AM Go to last post
  25. Exponential (θ ) distribution question

    Xsub1 and Xsub2 are independent Exponential ( θ ), θ >0, random variables. Let S= Xsub1 +Xsub2 Write the PDF of S stating any standard...

    Started by april_gsu2007‎, 11-08-2012 10:58 AM
    • Replies: 1
    • Views: 24,661
    11-08-2012, 11:41 AM Go to last post
  26. Unhappy Conditional Probability - Exam

    Someone can help me please, I need to understand them for my exam on Monday in next week. Today is Saturday.....Thanks a lot..... USING AND...

    Started by begacon‎, 07-28-2007 07:10 PM
    • Replies: 2
    • Views: 24,480
    07-13-2016, 01:00 AM Go to last post
  27. Normal Distribution times constant

    I can't seem to find anything about this on the web. If I have a random variable distributed Normally: x ~ Normal(mean,variance) is the...

    Started by BigBugBuzzz‎, 09-30-2012 09:45 AM
    normal distribution
    • Replies: 4
    • Views: 24,405
    02-18-2015, 09:45 PM Go to last post
  28. Geometric Distribution

    A geometric Distribution is a discrete probability distribution of a random variable x that satisifies: 1. A trial is repeated unitl a success...

    Started by galactus‎, 09-14-2006 05:48 PM
    • Replies: 0
    • Views: 23,170
    09-14-2006, 05:48 PM Go to last post
  29. Question Help with finding indicated probability

    I have worked on this problem now for the whole entire day, and still don't understand what I am doing wrong. Can someone help me? The problem...

    Started by teneclady201‎, 07-10-2008 05:40 PM
    • Replies: 4
    • Views: 23,124
    07-13-2008, 06:04 PM Go to last post
  30. MLE of a Gamma Distribution

    Hello everyone, I'm having quite some trouble with a question about the maximum likelihood estimator of a gamma distribution. The question is as...

    Started by Halfpixel‎, 11-26-2008 04:44 AM
    • Replies: 2
    • Views: 23,099
    11-26-2008, 01:24 PM Go to last post
  31. probability of one random variable being greater than another

    I took statistics many moons ago, and remember performing these calculations, but for the life of me I can't remember what this process is called, or...

    Started by manzell‎, 03-07-2008 04:19 PM
    • Replies: 3
    • Views: 23,073
    04-22-2012, 12:38 PM Go to last post
  32. Expected Value of Exponential Distribution

    I've almost completed this problem, but I'm stuck on the last part. The first two parts that I've already shown are also given: a) For a whole...

    Started by moberle‎, 05-23-2007 04:27 PM
    • Replies: 1
    • Views: 22,538
    07-03-2007, 01:24 PM Go to last post
  33. Lightbulb mann whitney test or Kolmogorov smirnov test?

    I'm working with non parametric methods to compare two samples and detect diferences between them. I used the mann-whitney test and obtained, for all...

    Started by Marga‎, 11-02-2006 06:46 AM
    2 Pages
    1 2
    • Replies: 23
    • Views: 22,313
    05-09-2010, 02:28 PM Go to last post
  34. What is the meaning of kurtosis?

    I found in Wikipedia that kurtosis is measurement of peakiness of the famous bell curve. If kurtosis is more than 3, it is kind of peaky, if kurtosis...

    Started by insight‎, 12-04-2007 05:30 AM
    • Replies: 10
    • Views: 22,293
    11-09-2011, 12:39 PM Go to last post
  35. I still need help please

    Ok, so I am still working on this freaking problem. Can someone help me please. It states that the scenario is normally distributed with a mean price...

    Started by BestNurse‎, 12-12-2009 08:42 PM
    • Replies: 12
    • Views: 21,755
    12-14-2009, 09:10 PM Go to last post
  36. Z-scores for probability in tails

    I haven't done any stats in years and now I am in a course for my grad program and I am so lost. My teacher is very confusing and I am trying my best...

    Started by rmbr2‎, 10-02-2008 01:18 PM
    • Replies: 3
    • Views: 21,731
    10-16-2008, 06:45 AM Go to last post
  37. Probability in my exam

    Here is the scenario for my practice exam: "You have been hired by a firm which produces customised engineering machinery to provide some...

    Started by newbiestats‎, 11-13-2011 09:10 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 21,000
    05-30-2012, 01:34 AM Go to last post
  38. 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: 20,332
    09-21-2011, 10:25 PM Go to last post
  39. Question Discrete Probability Distributions - Shoot me now!

    I spent three hours at a basketball tournament trying to figure these out. Please help. Using the Poisson Probability Distribution I have the...

    Started by Parillamaster‎, 02-13-2006 09:08 AM
    • Replies: 2
    • Views: 20,315
    02-13-2006, 09:58 AM Go to last post
  40. Find E(X) and VAR (X)

    Question is: There is one error in one of five blocks of program. To find the error, we test three randomly selected blocks. Let X be the number of...

    Started by smske‎, 01-15-2012 08:21 AM
    • Replies: 10
    • Views: 20,138
    04-10-2016, 03:54 AM Go to last post
  41. Post Dependent Event Vs Independent Event Vs Mutually Exclusive Events

    While reading probability book I come across with above terms. Following questions raised in my mind. 1)Are Dependent events always Mutually...

    Started by sachinner‎, 01-14-2013 12:51 PM
    • Replies: 3
    • Views: 20,038
    01-15-2013, 10:04 AM Go to last post
  42. Can't understand some probability symbols.

    For two events, A and B, P(A) =1/2, P(B) =1/3, and P(A �� B) =1/4. Find P(B | A). The symbol where is shows a box here is an upsidedown U. Does...

    Started by jsundsmo‎, 06-16-2007 02:58 PM
    • Replies: 2
    • Views: 19,981
    06-17-2007, 01:00 AM Go to last post
  43. conditional binomial is a poisson distribution

    Hi, I'm fighting with this problem for a while. There is something important I'm missing So the problem goes like this X~Poisson(lambda) and Y|X=k...

    Started by exuberant‎, 12-24-2010 09:28 AM
    • Replies: 13
    • Views: 18,134
    10-21-2015, 04:01 PM Go to last post
  44. 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: 17,827
    01-26-2013, 12:51 AM Go to last post
  45. 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: 17,806
    10-30-2006, 03:34 PM Go to last post
  46. probability

    I just posted another question and figured it out by myself but now i'm really stuck. Any suggestions to help me through it? Any input would be...

    Started by USMstudent85‎, 04-11-2011 10:03 AM
    • Replies: 3
    • Views: 17,762
    04-14-2011, 06:19 AM Go to last post
  47. Joint distribution, find P(X^2 + Y^2 <=1)

    I am trying to teach myself (without a tutor) some degree level Statistics. I think I've answered parts a-c of this question, but would like...

    Started by NicolaR‎, 01-16-2009 03:49 PM
    • Replies: 6
    • Views: 17,588
    01-17-2009, 02:42 PM Go to last post
  48. probability of consumption

    could someone let me know what i'm doing wrong? A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet...

    Started by rzum‎, 06-08-2007 02:13 PM
    • Replies: 4
    • Views: 17,560
    06-13-2007, 11:06 AM Go to last post
  49. Standard Normal Variable Z ... I do not understand

    :confused: Hi, This is not a homework question as I have the answer, just trying to figure out the method; I have a "Normal Distribution...

    Started by thedealer‎, 04-23-2006 02:25 PM
    • Replies: 2
    • Views: 17,078
    04-23-2006, 02:33 PM Go to last post
  50. Sum of Poisson Distribution

    Hi everyone. Let X and Y be independent, with X~Poi(lambda) and Y~Poi(mu). Put Z = X + Y as their sum. Find the distribution X | Z = z.

    Started by woody198403‎, 08-18-2009 07:07 AM
    • Replies: 8
    • Views: 16,922
    02-13-2012, 07:50 PM Go to last post
  51. Uniform Probability Distribution

    The driving distance for the top 100 golfers on the PGA tour is between 284.7and 310.6 yards (Golfweek, March 29, 2003). Assume that the driving...

    Started by USMstudent85‎, 04-11-2011 09:51 AM
    • Replies: 5
    • Views: 16,828
    04-11-2011, 01:53 PM Go to last post
  52. sample percentage contained within symmetric limits

    Hi! Thank you in advance for assisting with my question. I am working on a probability question and am able to answer almost all of it except one...

    Started by ealeql‎, 09-07-2010 10:44 PM
    • Replies: 3
    • Views: 16,719
    09-08-2010, 10:57 AM Go to last post
  53. Probability on a Multiple Choice exam

    Hello, I am not very good at this type of stuff. I thought up something and I was wondering if someone can look over it and tell me if my...

    Started by Paradox‎, 11-27-2010 04:01 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 16,191
    12-25-2011, 07:07 AM Go to last post
  54. Events A and B with complements

    Hi all, I will show the quest first and my work after. Given: P(A) = 0.3, P(B) = 0.8, P(AUB) = 0.9 A) Find P(A|B), P(A'nB), P(B'UA') B)...

    Started by Tjvelcro‎, 10-24-2010 12:48 PM
    • Replies: 1
    • Views: 15,855
    10-24-2010, 01:39 PM Go to last post
  55. Maximum of a set of independent normal random variables

    Consider a set of random variables X_1, X_2, X_3, \ldots, X_n with unit varience but different means: \mu_1, \mu_2, \mu_3, \ldots, \mu_n . What...

    Started by mightymergz‎, 07-08-2010 02:50 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 15,802
    07-12-2010, 03:45 PM Go to last post
  56. finding value of z0

    P(|z| > z0) = 0.10 Find z0. I think the answer is z0 = 1.28, however I'm not sure how to get that. The first time I did it, I got 1.645,...

    Started by toronto416‎, 08-04-2008 11:39 AM
    • Replies: 1
    • Views: 15,652
    08-04-2008, 11:55 AM Go to last post
  57. Creating a joint probability table

    I need help figuring out how to create this joint probability table 43 million people in the United States go without health insurance. Sample...

    Started by elementarystat‎, 09-03-2009 02:17 PM
    • Replies: 3
    • Views: 15,431
    09-03-2009, 09:58 PM Go to last post
  58. Poisson distribution

    The Poisson Distribution is often used as a model for the number of events occuring within a specific time period. The Poisson probability mass...

    Started by quark‎, 11-17-2005 12:25 PM
    • Replies: 0
    • Views: 15,396
    11-17-2005, 12:25 PM Go to last post
  59. Cauchy-Schwarz inequality: cov(X,Y)]^2 ≤ var(X) var(Y)

    Suppose that X andy Y are (scalar) random variables. Show that ^2 ≤ var(X) var(Y). (Cauchy-Schwarz inequality) Sow that equality holds if and...

    Started by kingwinner‎, 10-10-2009 06:03 PM
    • Replies: 0
    • Views: 15,188
    10-10-2009, 06:03 PM Go to last post
  60. This probability problem is all over the internet...

    This seems to be a common statistics homework question, as it is all over the internet. Because of this, I know the answer (0.2904), but that is not...

    Started by Haikuseasmoke‎, 10-28-2009 01:33 PM
    • Replies: 3
    • Views: 14,677
    10-28-2009, 05:02 PM Go to last post

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