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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: 30,357
    09-30-2005, 09:44 AM Go to last post
  1. Football Betting Method

    Say I have 3 betting methods on football games. Each system is able to predict the winner with 60% accuracy. Method1: 60% Method2: 60% Method3:...

    Started by shrek‎, 10-02-2008 03:20 AM
    • Replies: 1
    • Views: 4,169
    10-04-2008, 05:00 PM Go to last post
  2. How can I determine the accuracy of some predictions?

    How can I determine the accuracy of some predictions? Take the example of weather forecasts. Each day weather.com has a predicted probability it will...

    Started by TheAndruu‎, 05-17-2010 12:18 PM
    • Replies: 2
    • Views: 4,165
    05-18-2010, 11:47 AM Go to last post
  3. probalility question

    The duration of Alzheirmer's disease from the onset of symptoms until death rangers from 3 to 20 years. The average is 8 years with a population...

    Started by shaz‎, 12-06-2008 09:12 PM
    • Replies: 1
    • Views: 4,162
    12-06-2008, 11:03 PM Go to last post
  4. Exclamation Proof question

    Using the identity: (^θ -θ) = + = + B(^θ) , Show that

    Started by sigma.g19‎, 07-20-2011 05:15 PM
    • Replies: 1
    • Views: 4,162
    07-20-2011, 05:39 PM Go to last post
  5. 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: 4,162
    03-10-2012, 06:57 PM Go to last post
  6. Question regarding Z Scale - Is my answer correct?

    Here is the question. A company markets salmon in cans. It claims that the net mean weight of the cans is 8 and the standard deviation is .04. ...

    Started by bej0520‎, 10-12-2010 08:43 AM
    • Replies: 2
    • Views: 4,161
    10-12-2010, 09:41 AM Go to last post
  7. Finding the Probability

    Hi I just have a quick question, and just want to know if I did the question right :) A organization contains 2 events, E and T. The organization...

    Started by SmileAli‎, 04-02-2010 02:01 PM
    • Replies: 1
    • Views: 4,157
    04-02-2010, 02:09 PM Go to last post
  8. Order statistics, sample median

    Hi! Can you help me with this: we have X=(X1, X2, ... Xn) - iid, Xi ~ N(m,1), I need to prove that distribution of med(X)-X(j) is the same as...

    Started by anja‎, 04-08-2012 04:29 PM
    median, order statistics
    • Replies: 4
    • Views: 4,156
    04-08-2012, 04:59 PM Go to last post
  9. Assesing normality - Amateur question

    Hi everybody, (First of all, excuse my poor english : It's not my native tong). I'm working for myself on a computer programm which will deal...

    Started by OlivierT‎, 11-04-2006 10:34 AM
    • Replies: 4
    • Views: 4,154
    01-21-2008, 11:11 AM Go to last post
  10. normal distribution problem

    I'm in intro. stats. Help please. Question is: Test scores normally distributed with mean=68.2 and standard deviation=10.4. Estimate probability...

    Started by stgolf‎, 03-22-2008 03:18 PM
    • Replies: 0
    • Views: 4,153
    03-22-2008, 03:18 PM Go to last post
  11. Expectation of iid variables

    Hello I hope to get some help with this one. Let X_1,X_2 be iid random variables, both concentrated on I\subset\mathbb{R}_+. Define ...

    Started by cauchy‎, 12-16-2012 11:22 AM
    • Replies: 7
    • Views: 4,151
    12-17-2012, 12:18 PM Go to last post
  12. overlap integrals for empirical data

    Hi, I have two sets of data each originating from a different probability density function for a continuous stochastic variable (I do not know how...

    Started by choschech‎, 04-13-2010 11:27 AM
    • Replies: 2
    • Views: 4,150
    04-13-2010, 08:13 PM Go to last post
  13. Layperson with a question

    Hello! A friend of mine recently asked me for help with this, and while we kicked around a few ideas, we weren't really satisfied. That, and the fact...

    Started by Phi618‎, 07-20-2015 07:11 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 4,146
    08-06-2015, 09:10 PM Go to last post
  14. Mutual information of two vectors

    As with another poster on this section, I understand the ideas behind mutual information but am having trouble with finding information necessary for...

    Started by mishery‎, 01-02-2008 09:11 AM
    • Replies: 0
    • Views: 4,144
    01-02-2008, 09:11 AM Go to last post
  15. Discrete random variable

    Here is a problem given : Let X equal the number of flips of a fair coin that are required to observe heads-tails on consecutive flips. Need to...

    Started by B_Miner‎, 10-17-2008 07:25 AM
    • Replies: 1
    • Views: 4,144
    10-23-2008, 10:27 AM Go to last post
  16. Total Probability with Multiple Events

    I assume this is a simple question to answer, but it has been a long time since running through probability questions. I am basically looking for...

    Started by dmurphy48‎, 07-07-2009 07:50 PM
    • Replies: 1
    • Views: 4,141
    07-07-2009, 08:33 PM Go to last post
  17. z-test for a proportion

    Please help... Lets say that I have developed a new method and software prototype that aims to significantly reduce the ambiguity inherent in...

    Started by Steve‎, 05-29-2008 06:59 AM
    • Replies: 1
    • Views: 4,139
    05-29-2008, 07:40 AM Go to last post
  18. Student's t-Test -- just looking for confirmation

    For this particular t-Test, I'm comparing a sample with 16 values, mean 5.34, stdev .28 to a population whose mean is 5.27, stdev .08. I'm certain...

    Started by JoynerCN‎, 06-21-2010 10:39 PM
    • Replies: 2
    • Views: 4,137
    06-21-2010, 11:55 PM Go to last post
  19. Probability of getting your umbrella back

    This problem took me a while to figure out. Thought I'd post it up to see if other members would get it quicker than I did. A party has n guests,...

    Started by Link‎, 12-07-2010 11:07 PM
    • Replies: 1
    • Views: 4,137
    12-09-2010, 12:08 PM Go to last post
  20. Gelman Hierarchical Bayesian Beta Binomial model

    Hi folks: Am new to the board and hoping to post something that might be useful to someone. I'm currently trying to learn Bayesian modeling on my...

    Started by lostsoul‎, 03-17-2009 05:50 PM
    • Replies: 1
    • Views: 4,132
    03-18-2009, 03:52 PM Go to last post
  21. Wink Probability

    Question: Melissa must finish two courses, statistics and economics, in order to complete requirements for a degree. All along she has mainttaned an...

    Started by edwim12‎, 09-06-2005 08:32 PM
    • Replies: 2
    • Views: 4,130
    09-07-2005, 01:21 PM Go to last post
  22. Probablity of the ceiling falling?

    My friend asked me a question. "What is the probability of this ceiling falling?" I was puzzled. Then he replied that the probability is 1/2. Here is...

    Started by Jigar Gosar‎, 09-20-2007 03:10 PM
    • Replies: 9
    • Views: 4,130
    09-22-2007, 08:56 AM Go to last post
  23. About convergence of a monotonic sequence

    If {X_n} is a monotonically increasing sequence, such that X_1 <= X_2 <= X_3 <= ... and there's some subsequence of {X_nk} of {X_n} such that ...

    Started by evalover1987‎, 10-03-2010 03:26 AM
    • Replies: 0
    • Views: 4,127
    10-03-2010, 03:26 AM Go to last post
  24. density function

    hi, i'm working on a problem that goes like: A fire-detection device uses two temperature-sensitive cells (cell A and cell B) acting independent...

    Started by yon‎, 06-03-2009 07:39 PM
    • Replies: 3
    • Views: 4,122
    06-04-2009, 03:25 AM Go to last post
  25. Please Help HW.

    A study undertaken by the Miami-Dade Supervisor of Elections in 2002 revealed that 44% of registered voters are Democrats, 37% are Republicans, and...

    Started by joshbb‎, 09-25-2014 04:19 PM
    • Replies: 2
    • Views: 4,122
    09-26-2014, 04:20 AM Go to last post
  26. 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: 4,117
    01-16-2011, 07:21 AM Go to last post
  27. Continuous Random Variance

    Assume that x is a binomial random variable with n=1000 and p=0.5 Find the following probabilities: P(x >500) So mu=np=1000x0.5= 500 ...

    Started by n77ler‎, 10-19-2008 09:44 AM
    • Replies: 1
    • Views: 4,116
    10-19-2008, 01:02 PM Go to last post
  28. Probability of simply "guessing" in a Blind Triangle taste test

    Hi, I am a new member to these forums and I have a problem thatís been bugging me. A huge thank you for any help with this one. Itís an odd one. I...

    Started by AnRyan‎, 03-25-2013 10:57 AM
    • Replies: 3
    • Views: 4,116
    03-27-2013, 10:19 AM Go to last post
  29. Challenging Probability Question

    An analyst is presented with lists of four stocks and five bonds. He is asked to predict, in order, the two stocks that will yield the highest return...

    Started by anthonys‎, 03-02-2006 05:15 PM
    • Replies: 2
    • Views: 4,113
    03-03-2006, 01:37 AM Go to last post
  30. question about binomial distribution

    If the probability distribution of Y is defined by a binomial distribution, what would be the limiting distribution of Y/n as n approaches infinity?...

    Started by messianic‎, 07-13-2010 07:47 PM
    • Replies: 3
    • Views: 4,111
    07-13-2010, 09:26 PM Go to last post
  31. Not sure if I did this right! Please help!

    An oil drilling company ventures into various locations, and their success or failure is independent from one location to another. Suppose that the...

    Started by ankitj‎, 08-11-2009 12:19 PM
    • Replies: 6
    • Views: 4,106
    08-12-2009, 07:44 AM Go to last post
  32. Genetics Probability Question

    There is a genetic completely recessive trait. Neither mother or father display the trait but they may be heterozygous carriers. The...

    Started by Giacomo‎, 09-21-2010 03:51 PM
    • Replies: 1
    • Views: 4,105
    09-21-2010, 04:17 PM Go to last post
  33. Corrected significance level in Tukey HSD post-hocs?

    Dear all, I have a question that is really bugging me: I'm testing if seed set in one plant species is impacted by the deposition of pollen...

    Started by crazy_man‎, 10-24-2007 08:33 AM
    • Replies: 1
    • Views: 4,104
    10-28-2007, 06:31 PM Go to last post
  34. cost estimating with probability

    i'm trying to do a quick cost estimation using this monte carlo program to see how it works but i'm also trying to factor in different types of risk...

    Started by gummibear‎, 08-19-2008 05:14 PM
    • Replies: 0
    • Views: 4,101
    08-19-2008, 05:14 PM Go to last post
  35. 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: 4,101
    03-17-2013, 11:07 AM Go to last post
  36. Probability?

    Find the total number of outcomes when choosing the last three digits in a five-digit zip code if the first digit is 6 and the second digit is 1,...

    Started by mattc‎, 08-29-2005 09:46 PM
    • Replies: 1
    • Views: 4,100
    08-31-2005, 10:40 PM Go to last post
  37. Need help random variables

    Question 1) A hung jury is one that is unable to reach a unanimous decision. Suppose that a pool of 25 potential jurors are assigned to a murder case...

    Started by penguin22‎, 06-19-2007 10:45 AM
    • Replies: 2
    • Views: 4,099
    06-19-2007, 06:10 PM Go to last post
  38. Statistics question help! Stuck!

    I have a question regarding statiscs. Here is some information: A case of 600 past negligence cases showed 80% of the plantiffs were awarded...

    Started by inphluence‎, 11-08-2007 05:58 PM
    • Replies: 0
    • Views: 4,096
    11-08-2007, 05:58 PM Go to last post
  39. Question Probability Distribution

    The time (in hours) it takes before belts X and Y need replacing in a high use machine follows the joint probability distribution: integral y/100*...

    Started by SadieKhan‎, 09-21-2010 02:28 PM
    • Replies: 8
    • Views: 4,094
    09-22-2010, 01:01 PM Go to last post
  40. 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: 4,093
    02-02-2011, 05:25 PM Go to last post
  41. Some questions on Hypothesis, poissson and normal dist...try it

    Question 1 Millions of suburban commuters are finding railroads to be a convenient, time-saving, less stressful alternative to the automobile. While...

    Started by Shekhar‎, 10-22-2007 06:45 AM
    • Replies: 4
    • Views: 4,091
    03-03-2008, 01:53 PM Go to last post
  42. Limiting Distribution question

    Let X1,......,Xn ~ Uniform (0,1). Let Yn = X bar n ^2. Find the limiting distribution of Yn. We know that whenever a random variable has a...

    Started by greg6363‎, 10-07-2016 07:05 PM
    • Replies: 2
    • Views: 4,089
    10-11-2016, 03:38 PM Go to last post
  43. Game Probability

    Hi All - I have not looked at statistics or probability for a number of years but am wondering if someone can provide me with a formula for figuring...

    Started by acas‎, 07-14-2010 08:58 AM
    • Replies: 4
    • Views: 4,088
    07-14-2010, 12:26 PM Go to last post
  44. Smile Moment generating function

    I have a random variable V with density function: f(v) = (2/3)v, for 1<=v<=2 what is the moment generating function? My answer came out to...

    Started by thenumber5‎, 12-06-2010 03:03 PM
    • Replies: 2
    • Views: 4,088
    12-06-2010, 03:21 PM Go to last post
  45. Ratio of two Cauchy random variables.

    Hello. I'm trying to find the probability density function (pdf) of the random variable U = X/Y where X and Y are both iid Cauchy random...

    Started by univariate‎, 06-18-2010 09:54 PM
    • Replies: 2
    • Views: 4,087
    07-09-2012, 02:29 PM Go to last post
  46. Probability of complements.. is it that simple?

    P(A) = 1/4 P(B) = 2/3 P(A|B) = 1/4 Question: What is P(A^c|B^c) ? I don't think it's just 1 - 1/4 = 3/4 ... Would it be P(A^c) * P(B^c) =...

    Started by exitus‎, 02-13-2011 08:19 PM
    • Replies: 2
    • Views: 4,082
    02-14-2011, 01:19 AM Go to last post
  47. difference of two independent Poisson random variables

    Why the difference of two independent Poisson random variables doesn't have Poisson distribution? Demonstrate it.

    Started by LIPI‎, 02-10-2015 07:57 PM
    • Replies: 6
    • Views: 4,082
    02-13-2015, 11:50 AM Go to last post
  48. Cool Probability Distribution

    I have no clue. I need help solving this problem: About 71% of the student generally pass the psych. class. This semester 88 students took the...

    Started by youngfye‎, 11-11-2007 08:18 PM
    • Replies: 2
    • Views: 4,080
    12-11-2007, 04:39 PM Go to last post
  49. Smile Lottery combinations?

    Someones invented a bet and put it on beluckytote.com. I'm thinking of putting 20p on it but I'm not sure what the odds for the different options...

    Started by sid‎, 12-16-2009 04:32 PM
    • Replies: 3
    • Views: 4,080
    12-17-2009, 05:18 PM Go to last post
  50. Bejeweled Combos

    Hi all, Many of you I assume are familiar with Bejeweled, a puzzle game in which the player swaps neighboring, colored gems in an 8 x 8 grid to...

    Started by ajile‎, 07-16-2010 10:41 AM
    • Replies: 2
    • Views: 4,080
    07-16-2010, 12:08 PM Go to last post
  51. word problems

    Here are a few more questions that I got wrong and need help figuring out if anyone could help. Question 1: The length of time for students to...

    Started by orangeb‎, 02-08-2006 07:57 AM
    • Replies: 3
    • Views: 4,077
    05-19-2006, 12:21 PM Go to last post
  52. Random walk and Central limit theorem

    (Random Walk) A stock has the value of 100 on day 0. Each day, the value changes randomly either one unit upwards with probability 2/3 or two units...

    Started by JackSwan‎, 02-08-2010 04:16 AM
    • Replies: 2
    • Views: 4,077
    02-08-2010, 06:30 AM Go to last post
  53. Mean and var of maximum of n RVs from uniform dist.

    I am doing a problem that focuses on the maximum of n iid discrete RVs (Ymax) of Y1,...,Yn, each having the same probability distribution with common...

    Started by mada2009‎, 01-29-2012 10:52 AM
    • Replies: 2
    • Views: 4,076
    01-29-2012, 03:44 PM Go to last post
  54. Probability Distribution question

    Homework question involving number of defects found in a randomly selected factory item. if X is the number of defects found, and the probability...

    Started by jakedowdy‎, 02-21-2010 11:36 PM
    • Replies: 1
    • Views: 4,070
    02-22-2010, 01:32 PM Go to last post
  55. Binominal vs Geometric.....confused!!!!

    Hi there, I am currently working on these questions but I don't really get how to work them out. Is it wrong to use the binomial distribution for a)...

    Started by mmmmxx‎, 10-23-2011 01:13 PM
    binominal
    • Replies: 0
    • Views: 4,070
    10-23-2011, 01:13 PM Go to last post
  56. Probability that one random variable is greater than another

    I need to find the probability that a normally-distributed random variable is greater than a uniformly-distributed random variable. That is: X...

    Started by b_d‎, 07-19-2012 11:03 AM
    greater, normal, probability, uniform
    • Replies: 2
    • Views: 4,070
    07-20-2012, 12:52 PM Go to last post
  57. Probablilty binomial distribution

    Keeping in mind that this is an excerpt from a novel, let us examine the probability, 0.7980, of a successful jump. If you were one of the l2-member...

    Started by jammy006‎, 02-01-2010 09:13 AM
    • Replies: 7
    • Views: 4,068
    02-01-2010, 03:40 PM Go to last post
  58. Arrow Basic Probability

    6 Boys and 6 Girls sit in a row at random. Find the probability that the boys and girls sit alternately. Please help me with steps to calculate in...

    Started by sukumartenth‎, 10-29-2010 03:28 AM
    • Replies: 9
    • Views: 4,068
    10-29-2010, 03:58 PM Go to last post
  59. Probability that 53% of College Students graduate in 5 years or less

    Good Afternoon, I am working on a problem and got stuck. The problem is below: It is estimated that approximatly 53% of College Students graduate...

    Started by pjkaraffa‎, 08-05-2008 01:58 PM
    • Replies: 2
    • Views: 4,067
    08-05-2008, 06:46 PM Go to last post
  60. Help on Expected Value

    Thanks everyone! Now I understand it, the keyword is independent! :) My Answer: If I understand it right, since there are 3 dice, the...

    Started by juantamad‎, 07-01-2010 03:48 AM
    • Replies: 2
    • Views: 4,066
    07-01-2010, 01:28 PM Go to last post

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