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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: 30,331
    09-30-2005, 09:44 AM Go to last post
  1. Basketball probability

    a basketball player has a 40% chance of making a 3 point shot. if the player tries n=12 three pintshots, what is the probability that he makes...

    Started by yoleven‎, 02-05-2011 12:16 AM
    • Replies: 1
    • Views: 4,346
    02-05-2011, 01:59 AM Go to last post
  2. Computing a difficult expectation of a Gaussian r.v.

    I'd really appreciate any ideas that anyone could offer. Let X be a non-standard Gaussian random variable with mean a, variance b. Compute the...

    Started by sven svenson‎, 01-28-2011 03:18 PM
    • Replies: 2
    • Views: 2,942
    02-04-2011, 04:15 PM Go to last post
  3. empirical distribution

    Let (x1, …, xn) be iid random variables with the common cdf F(x). The empirical distribution is defined as F_n(x) = P_{Fn}(X<x) = \frac{1}{n}...

    Started by zzzc‎, 01-25-2011 09:39 PM
    • Replies: 1
    • Views: 3,476
    02-04-2011, 03:09 PM Go to last post
  4. red/white balls, distinct values X1,...,Xn

    There are (2n-1) choose (n-1) ways that n-1 red balls can be put in a line with n white balls. Can someone explain why? Thanks.

    Started by zzzc‎, 01-28-2011 09:12 PM
    • Replies: 1
    • Views: 2,456
    02-04-2011, 03:03 PM Go to last post
  5. Equity Trading Probability Question

    Hi Talk Stats, I'm an equity trader who is testing a new strategy. So far, we have succeeded on 72 of 103 trades, or a success rate of 69.90%. ...

    Started by cmarkos111‎, 02-03-2011 03:34 PM
    • Replies: 2
    • Views: 2,285
    02-03-2011, 04:06 PM Go to last post
  6. Probability of Victory

    Say I was looking at how all 14-seeds performed against 3-seeds over several years of the NCAA Basketball Tournament. And say I had several stats at...

    Started by haz33‎, 01-14-2011 05:16 PM
    • Replies: 4
    • Views: 3,426
    02-03-2011, 01:14 AM Go to last post
  7. Bivariate Normal + Max Transformation

    Hi guys, This exercise is driving me crazy. That is: (X,Y) follows a normal bivariate distribution E = E = 0 E = E = 1 E = r I have to...

    Started by caiohm‎, 02-01-2011 03:10 PM
    • Replies: 3
    • Views: 4,082
    02-02-2011, 05:25 PM Go to last post
  8. 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: 2,727
    02-01-2011, 12:14 PM Go to last post
  9. Joint density. Help!

    Let x and y have the joint density: f(x,y) = 6/7(x+y)^2 for 0<=x<=1 and 0<=y<=1 a.Find the marginal densities of X and Y. . b.By integrating...

    Started by Actuarial_Deepika‎, 01-30-2011 11:56 PM
    joint density, marginal density
    • Replies: 1
    • Views: 6,790
    01-31-2011, 03:01 AM Go to last post
  10. A question on probability

    Let X_1, X_2, \ldots, X_{10} be a random sample from N(80, 3^2) distribution. Define S = \sum_{i=1}^{10} U_i T = \sum_{i=1}^{10}\left(...

    Started by kamekaze‎, 01-29-2011 10:25 AM
    • Replies: 9
    • Views: 2,898
    01-30-2011, 11:56 PM Go to last post
  11. Unhappy Independence of Bivariate Continuos RV's.

    By the two definitions of independence for bivariate continuous RVs: (1) F(x,y)=F_X(x)F_Y(y) and (2) f(x,y)=f_X(x)f_Y(y). Prove that these two are...

    Started by Actuarial_Deepika‎, 01-30-2011 03:01 AM
    bivariate random variable, continuous, independent
    • Replies: 8
    • Views: 3,570
    01-30-2011, 11:44 PM Go to last post
  12. Question Joint cdf/pmf- Multinomial Distribution.

    I'll really appreciate if somebody could take time to explain the following question's answer. Suppose that (N1, N2) is multinomial with n=2,...

    Started by Actuarial_Deepika‎, 01-30-2011 02:53 AM
    • Replies: 4
    • Views: 6,970
    01-30-2011, 11:41 PM Go to last post
  13. Exclamation log-normal distribution and financial derivatives

    Please, help. Tis problem has almost taken all of my living forces away. The problem touches upon the pricing the structured product. The data given...

    Started by ketushka‎, 01-30-2011 04:31 PM
    • Replies: 0
    • Views: 2,974
    01-30-2011, 04:31 PM Go to last post
  14. Open courseware?

    Hello all, I am in need of practice probability/stats questions (at the introductory-intermediate level). Does anybody know of any links (perhaps...

    Started by Salohcin‎, 01-30-2011 01:37 PM
    • Replies: 1
    • Views: 2,227
    01-30-2011, 03:45 PM Go to last post
  15. Unhappy Discrete Functions and pmf/cdf.

    Suppose that X is discrete with pmf p(0)=p(1)=2p(2) (and zero otherwise). Find the pmf and cdf of X. How would you simulate the random variable X...

    Started by Actuarial_Deepika‎, 01-30-2011 02:48 AM
    • Replies: 0
    • Views: 3,330
    01-30-2011, 02:48 AM Go to last post
  16. Joint and Marginal Densities.

    I am having some problems grasping the concept of these joint and marginal densities. It would really help if someone could provide me with an answer...

    Started by Actuarial_Deepika‎, 01-30-2011 01:38 AM
    cdf, data analysis, joint density, marginal density, probability
    • Replies: 1
    • Views: 6,071
    01-30-2011, 02:28 AM Go to last post
  17. Inquiry

    Q. A certain gene is necessary for certain protein synthesis in human beings. A new kind of test can detect the gene in people who have the gene...

    Started by JMM_Stats‎, 01-20-2011 12:48 AM
    • Replies: 2
    • Views: 2,318
    01-28-2011, 09:44 PM Go to last post
  18. Probability of being removed

    Hi, There are 5 balls in a bag. 4 white and 1 Red. Assume that each color is equally likely to be removed. Now 4 balls are removed. What is the...

    Started by panbalag‎, 01-27-2011 10:33 AM
    • Replies: 1
    • Views: 2,832
    01-27-2011, 12:29 PM Go to last post
  19. Question CLT problem

    Let X_1,X_2,...X_n be a sequence of independent random variables. Suppose for k=1,2,3,.... P(X_{2k-1}=1)=P(X_{2k-1}=-1)=\frac{1}{2} and the pdf of...

    Started by Sambit‎, 01-25-2011 02:19 AM
    • Replies: 2
    • Views: 3,057
    01-26-2011, 01:59 AM Go to last post
  20. Post Help with stats assignment

    An airline knows that 5 percent of the people making reservations on a certain flight will not show up. Consequently, their policy is to sell 52...

    Started by lvpfan‎, 01-25-2011 06:49 PM
    • Replies: 2
    • Views: 5,334
    01-26-2011, 12:13 AM Go to last post
  21. Quantiles for the Wishart distribution

    1234567890

    Started by jessica01‎, 01-25-2011 01:48 PM
    • Replies: 1
    • Views: 4,167
    01-25-2011, 02:26 PM Go to last post
  22. Question Binomial and exponential distribution?

    Hi everyone. Could you help me with these two following problems: 1. A machine normally makes items of which 4% are defective. Every hour, the...

    Started by koala‎, 12-06-2010 10:30 PM
    • Replies: 1
    • Views: 5,255
    01-25-2011, 04:32 AM Go to last post
  23. Matching sets on Dice

    For those of you who know dice, I have this question: You roll multiple dice (with the same number of sides), what are the chances of getting...

    Started by ArmoredThirteen‎, 01-08-2011 05:43 PM
    dice
    • Replies: 6
    • Views: 5,080
    01-25-2011, 01:05 AM Go to last post
  24. 99% Confidence Interval

    Hi Guys, I'm stuck and need a little help on this one. I have calculated mean: 74.40 and Std Dev: 12.251 from Population 262, Sample 103. I...

    Started by Baseball Furies‎, 01-23-2011 04:40 PM
    • Replies: 3
    • Views: 5,522
    01-23-2011, 05:15 PM Go to last post
  25. Help with stats assignment?

    hi brainy people , i have a stat assignment due tomorrow and im stuck on a question: The gambling game Crown and Anchor uses special dice with...

    Started by izzy_isabel‎, 01-22-2011 09:12 PM
    • Replies: 0
    • Views: 2,332
    01-22-2011, 09:12 PM Go to last post
  26. Question Mgf

    Let X and Y have the following joint probability distribution:- P(X=x,Y=y) = \frac{e^{-2}}{x!(y-x)!} , x=0,1,2,...,y ; ...

    Started by Sambit‎, 01-17-2011 12:00 PM
    • Replies: 4
    • Views: 2,282
    01-21-2011, 08:43 AM Go to last post
  27. Question Confused About Probability?

    Hey all, I'm currently a stats student and i have run into confusion about some questions pertaining to probability. I have attempted the following...

    Started by Jeff_McD18‎, 01-19-2011 10:26 PM
    probability question
    • Replies: 14
    • Views: 4,689
    01-20-2011, 12:06 PM Go to last post
  28. 19 lowercase letters + 1 single digit number = possible combinations ?

    Hi everybody and happy new year too all :tup: I've just discovered this forum today and I have one thing to say : AWESOME ! :) I have trouble...

    Started by frederic1‎, 01-17-2011 01:23 PM
    • Replies: 10
    • Views: 7,383
    01-20-2011, 03:42 AM Go to last post
  29. Distribution and modeling of TV ad views

    An advertiser can show his ad in several different time windows on TV. For each time window the number of viewers who have their TV turned on...

    Started by kenasto‎, 01-20-2011 01:59 AM
    binomial distribution, poisson distribution, probability question
    • Replies: 0
    • Views: 2,399
    01-20-2011, 01:59 AM Go to last post
  30. hypothesis testing difference in means between simulated values

    Hi all, I am working with a demographic data set that consists of three separate transition matrices. I have simulated growth from an initial...

    Started by mrwawa‎, 01-19-2011 02:45 PM
    • Replies: 0
    • Views: 2,652
    01-19-2011, 02:45 PM Go to last post
  31. Simple Probability

    “ Dr. Brown and Dr. Chen each have 2 patients. At least one of Dr. Brown’s patients is male, and Dr. Chen’s first patient is male. Assume that the...

    Started by Helgi‎, 01-17-2011 01:39 PM
    • Replies: 3
    • Views: 2,427
    01-19-2011, 02:44 PM Go to last post
  32. Why can't I use the transformation...

    Why can't I use the transformation equation fy(y)=fx(x(y))AbsoluteValue to solve this problem: An actuary is reviewing a study she performed on...

    Started by jw9wz‎, 01-18-2011 11:49 PM
    • Replies: 4
    • Views: 2,676
    01-19-2011, 01:39 AM Go to last post
  33. MAGIC- random playing card at random position- other tricks as well

    I'm a magician- I'd like to be able to tell the spectators the chances of the outcomes that occur in some routines that I do. here is the...

    Started by jefflogg‎, 01-18-2011 02:01 AM
    • Replies: 0
    • Views: 3,347
    01-18-2011, 02:01 AM Go to last post
  34. how many degrees of freedom do I need to make a Root Sum Square valid?

    If I have two errors, that seems on the low end for using RSS. If I have a hundred, I feel pretty comfortable. I'm having trouble finding math...

    Started by cloughna‎, 01-17-2011 03:43 PM
    • Replies: 0
    • Views: 4,613
    01-17-2011, 03:43 PM Go to last post
  35. Chess probability of winning

    I've gotten into Chess recently with this app on my iphone and its gotten me thinking...has anyone worked with statistical algorithms for chess...

    Started by Link‎, 01-14-2011 07:12 PM
    • Replies: 3
    • Views: 6,897
    01-17-2011, 03:11 PM Go to last post
  36. Joint Distribution, where is my mistake ?

    Hi Guys, I was solving a question and getting the wrong answer, I don't know where my mistake is.... The question is: A second year student in...

    Started by WeeG‎, 01-16-2011 12:20 PM
    • Replies: 4
    • Views: 3,160
    01-16-2011, 04:36 PM Go to last post
  37. classical probability question...

    Hello to all experts, I need help with this, I am lost... A manager of an IT company gives randomly 8 projects to 4 teams, with equal...

    Started by Yankel‎, 01-16-2011 02:45 PM
    • Replies: 1
    • Views: 2,625
    01-16-2011, 02:51 PM Go to last post
  38. Negative Binomial ?

    Hi Guys, I need a little bit of guidance with this one... 2 balls are being drawn randomly from an urn containing 7 black balls, 3 white balls...

    Started by WeeG‎, 01-16-2011 10:49 AM
    • Replies: 1
    • Views: 2,763
    01-16-2011, 12:13 PM Go to last post
  39. Another Negative Binomial ?

    I am afraid I have another one from the same kind... 20% of the forms being submitted in a government office contain a mistake in them. Someone...

    Started by WeeG‎, 01-16-2011 10:59 AM
    • Replies: 0
    • Views: 1,955
    01-16-2011, 10:59 AM Go to last post
  40. Probability that a set of numbers is non-random?

    Hello, I'm wondering if anyone knows the answer to this: For a set of X numbers with a median of Y and a standard deviation of Z, where a set...

    Started by shiningbird‎, 01-16-2011 01:17 AM
    gaussian distribution, non-random, probability, random numbers, randomness
    • Replies: 1
    • Views: 4,104
    01-16-2011, 07:21 AM Go to last post
  41. Probability Question

    Hi Guys, I'm a novice at probability and would be very appreciative of some assistance with this question: If Company A (car manufacturer)...

    Started by Baseball Furies‎, 01-13-2011 06:01 PM
    • Replies: 5
    • Views: 3,946
    01-14-2011, 04:21 AM Go to last post
  42. confidence interval calculator

    Hello good people. I have a number of websites and would like to know how confident I can be with my click through rate. (clicks/ impressions) ...

    Started by sawa0018‎, 01-13-2011 10:58 AM
    • Replies: 1
    • Views: 4,812
    01-13-2011, 01:18 PM Go to last post
  43. Conditional Probability

    Hello, I have a question in probabilty. 100 Individuals. 40 with work experience, 30 with certificates and 20 with both work ex and...

    Started by tryinghard‎, 01-12-2011 11:01 PM
    • Replies: 1
    • Views: 3,346
    01-12-2011, 11:29 PM Go to last post
  44. Problem with binomial distribution

    Hi. I have a problem concerning binomial distribution that I don't quite understand how to solve. The problem is this: X ~ Bin(5, 0.1) and I...

    Started by everlost‎, 01-12-2011 01:37 PM
    • Replies: 2
    • Views: 3,744
    01-12-2011, 05:19 PM Go to last post
  45. Normal distribution question

    X is normally distributed with mean 100 and variance 81. What is the probability that X will lie between 88 and 112? Here is my approach:...

    Started by ohgallen‎, 01-10-2011 06:40 AM
    • Replies: 7
    • Views: 4,477
    01-12-2011, 05:28 AM Go to last post
  46. 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: 10,450
    01-11-2011, 09:28 PM Go to last post
  47. Need help for interpreting the simulation results...

    Hi all, I performed a simulation study on R for bootstrap, permutation and classic version of hotelling T^2 test, Goodall F , and James T test ...

    Started by avataravatar‎, 01-11-2011 08:24 AM
    • Replies: 0
    • Views: 2,174
    01-11-2011, 08:24 AM Go to last post
  48. P value interpretation

    I'm reviewing a report where two populations were compared using a two-tailed T test. I am wondering if this sentence is true: For example, a P...

    Started by RichardT‎, 01-10-2011 01:34 PM
    • Replies: 3
    • Views: 5,971
    01-10-2011, 05:02 PM Go to last post
  49. Urn with balls

    Hi guys, I have a question, I have also the answer, just don't understand it... In an urn there are 2 red balls numbers 1,2, and also 2 blue...

    Started by WeeG‎, 01-09-2011 01:29 PM
    • Replies: 1
    • Views: 2,938
    01-09-2011, 01:58 PM Go to last post
  50. Can you check my answers please?

    Hi, Can you please check my answers? Thanks 1) In examining borrower characteristics versus loan delinquency, a bank has collected the following...

    Started by SadieKhan‎, 01-09-2011 06:27 AM
    • Replies: 0
    • Views: 4,376
    01-09-2011, 06:27 AM Go to last post
  51. 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: 33,630
    01-07-2011, 01:55 PM Go to last post
  52. Stochastic process, empirical CDF, probability for bound

    From what I understand, a stochastic process is a family of random variables, each of which follows some probability distribution. Now, let's...

    Started by luismarques‎, 12-25-2010 12:59 PM
    • Replies: 2
    • Views: 4,653
    01-07-2011, 12:56 PM Go to last post
  53. Normal Probability Distribution

    In 2010, the population of SAT scores were normally distributed with a mean of 1020 (reading and math only) and a standard deviation of 200. The NCAA...

    Started by the_chemist‎, 01-06-2011 05:51 PM
    distribution, excel, normal
    • Replies: 2
    • Views: 5,453
    01-06-2011, 07:49 PM Go to last post
  54. Conditional Probability

    Let A and B be events such that P(A)=0.2, P(B)=0.3, and P(A|B)=0.1. What is P(A|B^c)? (i.e. what is B complement?) Answer is 0.243, but I have no...

    Started by the_chemist‎, 01-06-2011 04:54 PM
    conditional, probability
    • Replies: 1
    • Views: 2,406
    01-06-2011, 05:08 PM Go to last post
  55. Problem of ball & buckets (# balls, # buckets and # max. capacity per bucket)

    I need to resolve the following problem: There are 6 buckets and each bucket can hold a maximum of 16 balls (it could be 0 to 16 balls with equal...

    Started by bagheera‎, 01-05-2011 11:54 PM
    • Replies: 0
    • Views: 3,751
    01-05-2011, 11:54 PM Go to last post
  56. Looking for a sequence of functions that satisfies Fatou's lemma strictly

    Can anyone suggest a sequence of functions that satisfies the inequality in Fatou's lemma strictly?

    Started by seeker101‎, 01-05-2011 03:17 AM
    • Replies: 1
    • Views: 3,597
    01-05-2011, 05:09 AM Go to last post
  57. Prove if normal distribution is compact using characteristic function and moments

    Hi everybody, I have this question about "Prove if normal distribution is compact using characteristic function and moments". First of all...

    Started by LaNuit‎, 01-04-2011 05:57 PM
    • Replies: 0
    • Views: 3,361
    01-04-2011, 05:57 PM Go to last post
  58. Multivariate conditional probability

    Hello all, I'm having a difficult time finding an equation that will give me the conditional probability of a specific scenario occurring. To...

    Started by oreo0313‎, 01-03-2011 10:18 PM
    • Replies: 6
    • Views: 5,592
    01-04-2011, 11:16 AM Go to last post
  59. percentile for (1 - cumulative distribution function)

    Hi, Before addressing my question, please let me define the context: The percentile is usually defined as the value of a variable BELOW which a...

    Started by athos‎, 11-20-2010 07:26 PM
    • Replies: 4
    • Views: 13,008
    01-04-2011, 10:09 AM Go to last post
  60. Question problems with MGF

    Here are 2 similar kind of problems regarding MGF. So I'm posting on the same thread. Hope there is no problem. 1)MGF of a rv is given by...

    Started by Sambit‎, 01-04-2011 09:08 AM
    • Replies: 1
    • Views: 4,422
    01-04-2011, 10:08 AM Go to last post

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