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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: 30,181
    09-30-2005, 09:44 AM Go to last post
  1. Help with probability question

    I have been trying to figure out the answer to this one for a while now. An airplane has four engines. On a flight from New York to Paris, each...

    Started by kesh‎, 11-11-2012 08:14 AM
    • Replies: 3
    • Views: 3,477
    11-11-2012, 12:25 PM Go to last post
  2. Challenging probability question (expectation of iterative uniform integer)

    " You start with a number x_0. Let R(x_s) be a random integer drawn uniformly from {0,...,x_s-1}. We now play a game where we draw x_1=R(x_0). If...

    Started by AAAssswww‎, 11-10-2012 02:00 PM
    • Replies: 4
    • Views: 1,580
    11-10-2012, 05:59 PM Go to last post
  3. Bayes, and the Horse He Rode In On

    A professor presented this question: "If a cancer screen comes back positive in 68 of 75 cases of actual cancer and in 5 of 191 cases of no cancer,...

    Started by raywood‎, 11-09-2012 04:10 PM
    bayes, calculator, probability, screening
    • Replies: 2
    • Views: 1,877
    11-09-2012, 07:15 PM Go to last post
  4. 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: 27,792
    11-08-2012, 11:41 AM Go to last post
  5. Finding the Mean and Standard Deviation?

    So I'm stuck on this problem. In class we learned to solve this by using a table and calculator but it's been a while and I totally forgot. Here's...

    Started by pats4801‎, 11-05-2012 07:06 PM
    • Replies: 1
    • Views: 1,949
    11-05-2012, 09:04 PM Go to last post
  6. Convergence rate of Bates distribution to Normal distribution

    Hello, I am working on an illustration of approximating one distribution with another. Specifically, I am approximating a sample mean of N i.i.d....

    Started by xygorn‎, 11-05-2012 06:03 PM
    • Replies: 0
    • Views: 3,713
    11-05-2012, 06:03 PM Go to last post
  7. 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: 1,772
    11-04-2012, 11:35 PM Go to last post
  8. Probability poser card game

    Hello! We play a variation of 6 card brag but have a debate over the accurate ranking of the hands. 6 cards are dealt to each player. 2 hands of...

    Started by LukeClosely‎, 11-04-2012 10:30 AM
    cards, probability, statistics
    • Replies: 0
    • Views: 1,243
    11-04-2012, 10:30 AM Go to last post
  9. Red face Properties of Sample Proportions

    A city council is considering drafting legislation related to the exclusion of renters with children. Since implementation will be expensive, they...

    Started by klsybrns‎, 11-04-2012 07:55 AM
    help needed, help please, probability, probability distribution, statistic
    • Replies: 1
    • Views: 7,080
    11-04-2012, 09:02 AM Go to last post
  10. Moment Generating Function

    X and Y are independent RVs with the Gamma(\alpha,\lambda) distribution. W = X + Y. What is the moment generating function of W I know the...

    Started by simplemts‎, 11-03-2012 03:22 PM
    • Replies: 2
    • Views: 1,859
    11-04-2012, 05:09 AM Go to last post
  11. Time Independent Poisson Regression

    Hi there, I'm new to all this and am looking for an explanation in Layman's Terms Level 1 (level 1 being your average primate.....level 10 being a...

    Started by CardiffCasual‎, 11-02-2012 12:02 PM
    • Replies: 5
    • Views: 4,594
    11-03-2012, 02:30 PM Go to last post
  12. 1st order or 2nd order distribution

    Hi, I'm fitting a distribution to the starting times of the first car journey in the day. I have a sample of 3,000 journey starting times. I am...

    Started by bradyj2‎, 11-03-2012 08:55 AM
    • Replies: 0
    • Views: 2,054
    11-03-2012, 08:55 AM Go to last post
  13. continuous and discrete variables with a copula?

    Hi, I have 3 correlated variables that I wish to model with a copula function. 2 of the variables are continuous and 1 is discrete. My...

    Started by bradyj2‎, 11-02-2012 07:29 AM
    • Replies: 1
    • Views: 1,932
    11-02-2012, 10:29 PM Go to last post
  14. I think I did this right

    If x, the time (in minutes) to complete an change job at certain auto service station, is uniformly distributed over the interval 20 to 30,...

    Started by lonerider‎, 11-02-2012 07:35 AM
    • Replies: 1
    • Views: 6,433
    11-02-2012, 02:23 PM Go to last post
  15. Expected Value - Help PLEASE!!!

    How do you find E(1/X)? X is distributed binomially with probability p and n+1 terms: X~Binom(n+1, p). So E(X) = p(n+1), but how do I find E(1/X)?...

    Started by Aria1‎, 11-02-2012 03:57 AM
    expected value
    • Replies: 6
    • Views: 1,719
    11-02-2012, 02:21 PM Go to last post
  16. How to calculate a confidence level per unit in production

    If a manufacturer produces 100,000 boxes a day that are meant to be packed at 110 units per box, but varies from 105 to 115 units per box, what level...

    Started by agp640‎, 11-02-2012 06:41 AM
    • Replies: 0
    • Views: 2,515
    11-02-2012, 06:41 AM Go to last post
  17. R^2=0

    How can I show that R^2 can be equal to or less than zero? I can't find an example.

    Started by alias‎, 11-01-2012 10:17 PM
    • Replies: 8
    • Views: 2,129
    11-02-2012, 12:48 AM Go to last post
  18. Simplified Inventory Problem

    Hello, I'm having trouble with the following problem. Suppose that it costs c dollars to stock an item and that the item sells for s dollars....

    Started by TheDaezy‎, 10-31-2012 07:58 PM
    • Replies: 1
    • Views: 4,505
    11-01-2012, 02:57 AM Go to last post
  19. Lottery question

    Hey guys, new here. Just wondering if i am playing 23 games in a lottery, and IN TOTAL across the 23 games, the number 1 is drawn 9 times, what...

    Started by willh6373‎, 10-30-2012 07:54 PM
    binomial, hypergeometric, lottery, probability
    • Replies: 0
    • Views: 1,008
    10-30-2012, 07:54 PM Go to last post
  20. Method of Moments & MLE

    Are the Method of Moments ("MOM") and the Maximum Likelihood Estimator ("MLE") the same for a Negative Binomial Distribution with a sample space of...

    Started by simplemts‎, 10-30-2012 07:51 PM
    • Replies: 0
    • Views: 1,045
    10-30-2012, 07:51 PM Go to last post
  21. cumulative distribution function of a uniform distribution

    I just need some help on the question below. Bacteria are grown in a dish for a length of time (in hours) T which is a random variable with a...

    Started by gstyles1‎, 10-30-2012 08:16 AM
    cdf, probability, uniform distribution
    • Replies: 1
    • Views: 1,550
    10-30-2012, 10:17 AM Go to last post
  22. I am completely lost on how to start this problem. (How should I start it?)

    I'm not asking for someone to do the work for me but can you help give me an idea where to start? And I will add that this is not homework. This is...

    Started by Hco417‎, 10-24-2012 02:30 PM
    • Replies: 3
    • Views: 2,968
    10-30-2012, 09:51 AM Go to last post
  23. Probability question help!!!!

    I'm stuck and could use some help. I am finishing my hw and stumbled upon two problems that I cannot figure out out to do. 1. It has been...

    Started by mrsprop‎, 10-26-2012 01:35 PM
    • Replies: 2
    • Views: 5,032
    10-30-2012, 12:38 AM Go to last post
  24. Red face urgent!!Fisher LDA

    Please do have a look at the question, I dont understand this question ..please do let me know thw way to solve it!many thanks!!

    Started by jhxi1118‎, 10-28-2012 03:36 PM
    fisher, lda
    • Replies: 2
    • Views: 1,299
    10-29-2012, 04:40 AM Go to last post
  25. Joint Probability Distribution [insert desperate hw help plead here]

    So I've worked on these problems for quite a while but I can't figure them out. I'm not looking for someone to just do them for me, but if anyone...

    Started by Shaq's Left Nut‎, 10-28-2012 08:06 PM
    • Replies: 1
    • Views: 1,416
    10-29-2012, 12:50 AM Go to last post
  26. Hamsters

    X has the pdf, f(x) = 3x^2, for 0<x<1 conditional pdf of Y given X = f(y|x) = (3y^2)/(x^3), for 0<y<x The conditional density of X given Y...

    Started by Shaq's Left Nut‎, 10-28-2012 11:36 PM
    • Replies: 0
    • Views: 1,237
    10-28-2012, 11:36 PM Go to last post
  27. Exclamation Please help with probability question!

    A game consists of tossing two coins, first a dime and then a nickel. For each coin which comes up a head you win the value of the coin. For each...

    Started by klsybrns‎, 10-28-2012 08:07 PM
    probability help, probability question, probabilty
    • Replies: 0
    • Views: 972
    10-28-2012, 08:07 PM Go to last post
  28. Post urgent question for probability

    From a group of 5 people (2 females, 3 males) a team of 3 needs to be picked. The selection is done randomly by picking names from a hat, one name at...

    Started by jhxi1118‎, 10-28-2012 12:03 PM
    • Replies: 0
    • Views: 875
    10-28-2012, 12:03 PM Go to last post
  29. Calculate probability

    an urn contains 5 red and 3 blue chips. suppose that 4 of these chips are selected at random and transferred to a 2nd urn, which was empty. if a...

    Started by gambit‎, 10-28-2012 10:25 AM
    • Replies: 0
    • Views: 1,226
    10-28-2012, 10:25 AM Go to last post
  30. Calculating probability given mean and standard deviation

    Hi I have looked around for this post on the forum but could not find one and have spent a while attempting this question: Given that X is...

    Started by omf52‎, 10-28-2012 09:43 AM
    normal, p-value, standard deviation
    • Replies: 0
    • Views: 5,463
    10-28-2012, 09:43 AM Go to last post
  31. equal probabilities versus equal odds.

    Hi There, This is my first time on the forum but I was wondering if anyone can help me understand equal probabilities versus equal odds. My...

    Started by LadyC‎, 10-27-2012 08:22 PM
    • Replies: 1
    • Views: 1,640
    10-27-2012, 09:06 PM Go to last post
  32. problem

    Hello! A certain lock has five buttons, numbered from 1 to 5. The combination of numbers that opens the lock is a sequence of seven numbers and...

    Started by farseer‎, 10-26-2012 02:04 PM
    • Replies: 2
    • Views: 1,270
    10-26-2012, 02:39 PM Go to last post
  33. a tricky gaussian problem

    hello everyone, I am stuck with a problem I can't figure. I will try to explain briefly what it is: we run an experiment where we expect 4/9 of...

    Started by statwiz‎, 10-22-2012 06:29 AM
    • Replies: 2
    • Views: 1,289
    10-26-2012, 02:00 PM Go to last post
  34. Linear Estimators help

    Let x1, x2, x3, x4, x5 be a random sample where each of these observations are independent, E=...=E = μ; Var(x1)=...=Var(x5) = σ^2. μ1hat = x1 -...

    Started by alias‎, 10-25-2012 07:58 AM
    • Replies: 1
    • Views: 1,788
    10-25-2012, 12:31 PM Go to last post
  35. True proportion and probability

    Hey guys, need some help. Question: In a sample of 923 people, 49% of people favored X over Y. However, let's assume that the true proportion is...

    Started by Siege‎, 10-25-2012 03:36 AM
    • Replies: 2
    • Views: 2,889
    10-25-2012, 11:12 AM Go to last post
  36. [Gamma Distribution] Generate random number according to Gamma Distribution

    Hi, I request your help / suggestion to solve the following problem Suppose X_i, i=1,2,...,n are exponential RVs with mean 1/k. If the triggering...

    Started by shawonsaki‎, 10-23-2012 09:28 PM
    gamma distribution
    • Replies: 3
    • Views: 2,165
    10-25-2012, 03:54 AM Go to last post
  37. Basic Question on Random Variables

    My basic understanding is the following: Upper-Case RV: i.e. X_1 The RV above represents a Random Variable with a Distribution (Bernoulli, Poisson,...

    Started by simplemts‎, 10-24-2012 03:45 PM
    • Replies: 4
    • Views: 2,687
    10-25-2012, 01:34 AM Go to last post
  38. Continuous Random Variable Question involving Height!

    Hi, I am working through the following question and understand all except the last question: Suppose that the height, in inches, of a 25-year-old...

    Started by S-C-3-1-3‎, 10-24-2012 06:41 PM
    • Replies: 2
    • Views: 2,682
    10-24-2012, 09:44 PM Go to last post
  39. Ugh...tell me I'm reading this wrong...

    Hi Everyone, New here! I had a question around the wording of a problem, as I wrap my head around it... t-distribution problem, and the...

    Started by johnst‎, 10-22-2012 04:01 PM
    • Replies: 1
    • Views: 1,425
    10-24-2012, 06:16 PM Go to last post
  40. Hypothetical scenario for probability? How would you solve this?

    So here's a hypothetical scenario: From one source (let's call it A), the probability of the color red is 0.2 and orange is 0.8. From a second...

    Started by Hco417‎, 10-24-2012 02:22 PM
    • Replies: 5
    • Views: 2,212
    10-24-2012, 03:25 PM Go to last post
  41. Analyzing a sample list of numbers (median, quartiles, box plot)

    If you have a sample of 36 numbers (and some of these numbers are repeated more than once), how do you find the median, upper quartile, and lower...

    Started by Hco417‎, 10-24-2012 02:24 PM
    box plot, median, probability, sample
    • Replies: 2
    • Views: 1,861
    10-24-2012, 02:52 PM Go to last post
  42. Probability pros only! challenge yourself

    hi guys this is a qn i really cant solve . appreciate the help. its about this shogun( jap warlord) that wants to purge his daimyo(shogun) by...

    Started by mamypokozang‎, 10-24-2012 06:46 AM
    • Replies: 0
    • Views: 1,078
    10-24-2012, 06:46 AM Go to last post
  43. Determining a probability

    There are 15 CDs in a box. On 10 of the CDs there are saved data fi les, and the other CDs have no data files saved on them. i) Suppose that 12...

    Started by TheStatsGod‎, 10-23-2012 05:56 PM
    • Replies: 1
    • Views: 1,185
    10-23-2012, 11:00 PM Go to last post
  44. probability of someone owning an item

    This question is not for homework, but for curiosity. Google can't help, and a probability like this had not been covered in my statistics class. ...

    Started by sachmophoclies‎, 10-23-2012 11:34 AM
    • Replies: 2
    • Views: 1,332
    10-23-2012, 12:26 PM Go to last post
  45. Will passing the Actuarial Exam 1/P help in other professions?

    I wasn't sure what other thread to ask this in, so I figured probability was relevant. I've been studying for the 1st actuarial exam 1/P for a year,...

    Started by Shaq's Left Nut‎, 10-23-2012 11:49 AM
    • Replies: 1
    • Views: 1,215
    10-23-2012, 11:55 AM Go to last post
  46. Probability of making it to the finals

    Hi, I'm having a problem computing some probability of a player making it to the finals in a competition. Suppose, there is a competition with...

    Started by rikari‎, 10-23-2012 03:09 AM
    • Replies: 1
    • Views: 1,402
    10-23-2012, 05:53 AM Go to last post
  47. Reasonable return period value?

    I am doing extreme value analysis on some test data. You can think of the data as the temperature of an engine which hits peak values every few...

    Started by KAE‎, 10-22-2012 04:33 PM
    extreme value, gpd, return period
    • Replies: 0
    • Views: 1,284
    10-22-2012, 04:33 PM Go to last post
  48. Identify distribution graph

    Is it possible to identify the kind of distribution of a graph base solely on it's curve? I tried googling the kind of graph that i have but i'm...

    Started by statUser‎, 10-22-2012 07:41 AM
    • Replies: 3
    • Views: 2,556
    10-22-2012, 08:56 AM Go to last post
  49. Help!!

    In a recent survey about appliance ownership, 58% of the respondents indicated that they own Maytag appliances, while 24% indicated they own GE...

    Started by lonerider‎, 10-20-2012 11:30 PM
    • Replies: 5
    • Views: 4,596
    10-21-2012, 10:34 PM Go to last post
  50. Regression through origin, R^2=0

    A 2-variable regresssion with no intercept is given as: Yi=β1Xi +ui, show that r-squared for this model is equal to zero. I know that R^2...

    Started by alias‎, 10-21-2012 04:28 PM
    • Replies: 1
    • Views: 1,501
    10-21-2012, 09:59 PM Go to last post
  51. Please help me with these questions

    So my teacher gave us practice questions for a test review and i dont understand these questions at ALL. Can someone please explain how to do...

    Started by Biz‎, 10-21-2012 07:17 PM
    • Replies: 0
    • Views: 1,360
    10-21-2012, 07:17 PM Go to last post
  52. Identify Distribution

    Let X1, X2, ..., X100 be independent, each with the standard normal distribution. (a) Identify the distribution of X_1^2 My Answer: Exponential...

    Started by simplemts‎, 10-19-2012 09:50 PM
    • Replies: 4
    • Views: 2,084
    10-21-2012, 04:20 PM Go to last post
  53. Probablity and Usability

    Here is the question: A usability engineer claims that in usability experiments there is a 40% chance (or a probability value of 0.4) that a user...

    Started by somethingclever‎, 10-20-2012 08:41 PM
    • Replies: 6
    • Views: 1,818
    10-21-2012, 11:58 AM Go to last post
  54. Question Probability involving college admissions

    Here is the question: College admissions: For high school students graduating in 2010, college admissions to the nation’s most selective schools...

    Started by somethingclever‎, 10-20-2012 07:37 PM
    • Replies: 10
    • Views: 4,117
    10-21-2012, 11:55 AM Go to last post
  55. Need Help with this probability question

    Hi everyone, i am new to the forum. So I was never really good at probability, which is why I am posting here to see if I did these questions...

    Started by Biz‎, 10-20-2012 06:07 PM
    • Replies: 6
    • Views: 1,800
    10-20-2012, 08:50 PM Go to last post
  56. Xn~Exponential(.5) -> Xn~Normal. Use Chebychev's inequality

    Xn are iid Exponential(.5). After using the central limit theorem, Xn is Normally distributed. Use chebychev's inequality to find out how large n be...

    Started by phychoflip29‎, 10-15-2012 04:57 PM
    chebychev's inequality, exponential, normal
    • Replies: 6
    • Views: 2,254
    10-20-2012, 03:01 PM Go to last post
  57. Probability Question

    Hi I have tried tooth and nail to try and get this question done but cant seem to solve it. I have just started university and am coming to terms...

    Started by masamoah23‎, 10-17-2012 01:47 PM
    • Replies: 8
    • Views: 1,995
    10-20-2012, 05:23 AM Go to last post
  58. Two Random Variables Normal Distribution

    X1 ~ N(3,2^2), X2 ~ N(-8, 5^2) Let U = X1 - 5X2 Let V = -6X1 + CX2, where C is constant. (a) What are the distributions of U and V? I know U ~...

    Started by simplemts‎, 10-19-2012 03:37 PM
    • Replies: 13
    • Views: 4,586
    10-19-2012, 11:00 PM Go to last post
  59. Lipet?

    f(x) = cxe^(-x^2), for x > 0 c is a constant that's the pdf of x, so to find c you integrate that and set equal to 1 correct? and i think you...

    Started by Shaq's Left Nut‎, 10-19-2012 01:04 PM
    • Replies: 4
    • Views: 2,198
    10-19-2012, 04:26 PM Go to last post
  60. Problem involving selecting players from a Basketball team.

    Hi, I want to solve the following problem: Suppose a team of 5 guards and 6 forwards must be selected from a roster of 10 guards and 16 forwards....

    Started by S-C-3-1-3‎, 10-18-2012 07:59 PM
    • Replies: 9
    • Views: 2,124
    10-19-2012, 02:16 PM Go to last post

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