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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: 30,343
    09-30-2005, 09:44 AM Go to last post
  1. 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: 36,400
    12-23-2010, 02:14 PM Go to last post
  2. Probability Concepts Homework Help!!

    Hi, I have been struggling with this question for the past few days now and still can't seem to figure it out. If anyone can help me and show me...

    Started by will023‎, 02-23-2010 03:09 PM
    • Replies: 7
    • Views: 12,528
    02-24-2010, 12:51 PM Go to last post
  3. Reinforced Probability

    Hello All, I have been trying for ages to solve this, so any advice no matter how minimal would be greatly appreciated. Suppose there is some...

    Started by Salohcin‎, 05-27-2010 09:49 AM
    • Replies: 7
    • Views: 2,579
    05-28-2010, 11:02 AM Go to last post
  4. Help on comparing mean to distribution values

    Hi all, I'm new here -- I'm tutoring a student in Probability/Statistics, and I've come across a type of problem that I can't recall how to solve....

    Started by JoynerCN‎, 06-17-2010 09:49 AM
    • Replies: 7
    • Views: 3,780
    06-17-2010, 11:55 AM Go to last post
  5. Bivariate Normal distribution

    I want to get the characteristic function of the bivariate normal distribution when both means =0 and variances =1 . I can't do the integration. In...

    Started by Emy‎, 06-26-2010 03:52 AM
    • Replies: 7
    • Views: 4,706
    06-26-2010, 02:28 PM Go to last post
  6. Normal distributions

    I have been using my TI 84 Plus Silver Edition calculator to try and figure this out with no luck :-( Can anyone help? Assume that the heights of...

    Started by jerttehcamper‎, 07-14-2010 07:22 PM
    • Replies: 7
    • Views: 5,888
    07-15-2010, 01:58 PM Go to last post
  7. Probability Question

    Hello, I need a wee help with this question... "A company that repair computers go with the next sale: If the waiting time of a customer for...

    Started by WeeG‎, 08-02-2010 01:44 AM
    • Replies: 7
    • Views: 2,610
    08-04-2010, 11:11 AM Go to last post
  8. regression of multple populations in one dataset

    Hi, I have a dataset (x,y) that contain several populations with their own trends. I would want to perform regression on each one separately, but...

    Started by pimk‎, 08-30-2010 02:42 PM
    • Replies: 7
    • Views: 3,607
    08-31-2010, 09:00 AM Go to last post
  9. Die throwing game

    A fair die is thrown a number of times and every time we count the number of dots (cumulative), until the total number of dots is bigger than or...

    Started by Ego7894612‎, 09-09-2010 07:26 AM
    • Replies: 7
    • Views: 4,829
    09-10-2010, 02:37 PM Go to last post
  10. Normal Distribution

    Hi, I ask this question in relation to a commerce project which I am working on in regards to the probability distributions of operating profits. ...

    Started by theorbb‎, 09-13-2010 02:52 AM
    • Replies: 7
    • Views: 3,477
    09-14-2010, 11:54 AM Go to last post
  11. 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: 36,649
    09-27-2010, 10:35 AM Go to last post
  12. Finding E[X] and Var[X] of exponential distribution

    Transistors produced by one machine have a lifetime which is exponentially distributed with mean 100 hours. Those produced by a 2nd machine have an...

    Started by StatStudent3‎, 10-18-2010 09:23 AM
    • Replies: 7
    • Views: 10,224
    10-19-2010, 12:23 PM Go to last post
  13. cant decide null and alternative

    . Last fall, a sample of n= 36 freshmen was selected to participate in a new 4-hour training program designed to improve study skills. To evaluate...

    Started by SadieKhan‎, 10-20-2010 01:25 AM
    • Replies: 7
    • Views: 4,939
    10-21-2010, 06:41 AM Go to last post
  14. Transition Probability

    Hi. I have a question about transition probability. Q) Markov chain on states {0,1,2,3,4,5} has transition probability matrix (which is 6 by 6...

    Started by jjangub‎, 10-31-2010 01:23 PM
    • Replies: 7
    • Views: 4,438
    11-03-2010, 05:46 PM Go to last post
  15. Easy Probability Question

    Hi. I have an easy probability question. If you flip a coin 50 times, what is the probability of getting 70% heads? Sorry this is so easy,...

    Started by cmarkos111‎, 11-04-2010 01:54 PM
    • Replies: 7
    • Views: 2,896
    11-04-2010, 05:05 PM Go to last post
  16. Minimum of 2 Random Variables question

    R(1) and R(2) are 2 independent random variables with same density function f(x) = x*(e^(-.5 * x^2)) for x >= 0. Find the density of Y = min{R(1),...

    Started by StatStudent3‎, 11-04-2010 05:27 PM
    • Replies: 7
    • Views: 13,854
    11-05-2010, 11:13 PM Go to last post
  17. CJD problem

    In a large corporation, people over age 30 have an annual income whose distribution can be approximated normally ~ ($60K, $100,000,000) with SD =...

    Started by StatStudent3‎, 11-13-2010 02:47 PM
    • Replies: 7
    • Views: 3,218
    11-14-2010, 08:19 AM Go to last post
  18. Exclamation help with exponential distribution

    X1,X2,...,XN are independently identically exponentially distributed with expected value of 5. How can I compute Xn when n=20 and N=1000? Then...

    Started by omega‎, 11-29-2010 07:33 PM
    • Replies: 7
    • Views: 6,343
    11-30-2010, 12:13 AM Go to last post
  19. Simple Probability Question

    Hi. I have a simple probability question: Not counting the greens, what are the odds of getting 19 of the same color in a row in roulette? ...

    Started by cmarkos111‎, 12-01-2010 06:21 PM
    • Replies: 7
    • Views: 3,422
    12-02-2010, 12:44 PM Go to last post
  20. 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: 4,479
    01-12-2011, 05:28 AM Go to last post
  21. Comparing Gaussian curves

    Hi, I have two points A(30.333,100) and B(30.333151665,80) I need to draw Gaussian for each point separately and need to check their overlap...

    Started by asd123‎, 03-04-2011 04:28 AM
    • Replies: 7
    • Views: 9,161
    08-31-2011, 05:35 PM Go to last post
  22. Lightbulb Probability of event

    Hello Friends I'll try to ask in very simple way I will have multiple choice test next month and i have 240 questions every question has 3...

    Started by banebt‎, 03-07-2011 09:03 AM
    multiple choice questions, probability
    • Replies: 7
    • Views: 3,560
    03-08-2011, 02:06 PM Go to last post
  23. Looking for assistance with random prize probability among family

    Hello all, I signed up specifically in search for some assistance in a real world problem, hope that's alright. We have an application that...

    Started by akskier‎, 06-23-2011 01:14 AM
    • Replies: 7
    • Views: 2,943
    06-29-2011, 11:55 AM Go to last post
  24. wishart distribution and correlation matrix???

    hey there everyone! just a quick question.... you see how the sampling distribution of the covariance matrix follows a wishart distribution (for...

    Started by will22‎, 03-22-2011 02:10 PM
    • Replies: 7
    • Views: 8,982
    09-16-2013, 03:01 AM Go to last post
  25. Probability - transformation of random variable

    In an analog to digital conversion an analog waveform is sampled, quantized and coded. A quantized function is a function that assigns to each sample...

    Started by dizzle1518‎, 05-04-2011 06:49 PM
    • Replies: 7
    • Views: 4,160
    05-05-2011, 11:02 AM Go to last post
  26. Poisson Question

    I'm not a stat guy by any means, so I want to check my thinking here. Let's say a football player scored 11 Touchdowns in 16 games for an average...

    Started by cpaavola‎, 06-01-2011 03:16 PM
    • Replies: 7
    • Views: 2,682
    06-01-2011, 07:02 PM Go to last post
  27. Probability Problem

    Apologies if my terminology is bad, I haven't done any statistics for years. If this thread is posted in the wrong place, sorry I am new to this...

    Started by adz‎, 07-28-2011 10:40 AM
    • Replies: 7
    • Views: 2,478
    07-28-2011, 11:46 PM Go to last post
  28. Simple Homework Problem: Urgent.

    Hi, Here are a couple questions: I've attempted some answers, which you see below. Please can you check me and help! a) We want P(D1)....

    Started by Peytonator‎, 08-16-2011 11:56 AM
    • Replies: 7
    • Views: 2,272
    08-16-2011, 03:16 PM Go to last post
  29. Question Finding the max and min P-value from an F-tets

    There is a following task in my econometrics HW: 1) I have 25 values of the {X} random value. First I find the variation, then the estimation for...

    Started by Artemy Piskarev‎, 09-28-2011 03:54 AM
    • Replies: 7
    • Views: 8,976
    09-30-2011, 07:28 AM Go to last post
  30. probability, independent or dependent

    Hello. I roll a dice twice. Let's say that A = odd number on first, B = even number on second, C = sum is odd. Now, I need to calculate P(A),...

    Started by 8Julio‎, 10-08-2011 02:11 AM
    • Replies: 7
    • Views: 3,188
    10-10-2011, 09:56 AM Go to last post
  31. Smile Uniform and Independent Probability (Simple Problem)

    Hey there, I have a quick question. The problem: 3 numbers, say X, Y, and Z are chosen from a set of numbers (1 to n) where n is greater or...

    Started by blackrobe89‎, 10-11-2011 11:05 PM
    distribution, independent, probability, uniform
    • Replies: 7
    • Views: 3,356
    10-12-2011, 08:17 AM Go to last post
  32. Question Binomial Probability, Real Limits, X=0

    Can someone have guessed on quiz and got all 50 questions wrong, but still get 100%? Thanks in advance! :D

    Started by jimbrowsky‎, 10-16-2011 01:22 AM
    binomial, binomial distribution, binomials, continuous, real limits
    • Replies: 7
    • Views: 4,469
    10-16-2011, 04:36 PM Go to last post
  33. method of moments and MLE question

    Hello all, I have a question regarding a problem asking to obtain an estimator for theta using MLE and method of moments and then to compute the...

    Started by romanha1‎, 10-29-2011 06:47 PM
    • Replies: 7
    • Views: 5,658
    10-29-2011, 08:48 PM Go to last post
  34. Help with a problem.

    Problem: 2. Photocards-R-Us is a photo card printer. For this year, they have found that 10% of the cards they make are of inferior quality (blurred...

    Started by centurion1‎, 11-26-2011 06:10 PM
    • Replies: 7
    • Views: 2,391
    11-27-2011, 07:40 AM Go to last post
  35. normal distribution

    Please explain me how to do that? What is the probability that a worker at Random drives more that 15 miles to work if the distribution of all...

    Started by Asya‎, 12-03-2011 03:31 PM
    • Replies: 7
    • Views: 2,260
    12-03-2011, 05:21 PM Go to last post
  36. (Simple?) probability question...

    Three coins. One is fair; one is two-headed; one is two-tailed. We pick a coin at random, flip it, and it comes out heads. The probability that...

    Started by jesse2‎, 12-15-2011 11:14 AM
    • Replies: 7
    • Views: 2,374
    12-15-2011, 12:05 PM Go to last post
  37. Combining 2 transitional probability matrices?

    Hello, How would you/or is it possible to combine two transitional probability matrices? Say for example I have 2 matrices that both measure...

    Started by bradyj2‎, 02-21-2012 11:37 AM
    • Replies: 7
    • Views: 2,122
    02-22-2012, 07:21 AM Go to last post
  38. Conditional probability problem

    Hi, So here's the problem I've been working on for several hours now: "Deer ticks can be carriers of either Lyme disease or HGE. Based on a...

    Started by daydreamset‎, 02-05-2012 07:29 AM
    • Replies: 7
    • Views: 6,001
    02-06-2012, 09:27 PM Go to last post
  39. Probability different colored balls picked without replacement "at least one of each"

    Hello everyone. I am a hobby programmer working on a cool new project. I've always loved probability and always wanted to write a program using it...

    Started by neogenesisrevo‎, 02-16-2012 10:07 AM
    • Replies: 7
    • Views: 10,015
    02-19-2012, 07:38 AM Go to last post
  40. Chi-Square distribution problem

    So my professor started doing stuff with the chi-square distribution this week and I've been lost for almost the entire time. Consider a random...

    Started by APOCooter‎, 02-18-2012 02:20 PM
    • Replies: 7
    • Views: 9,594
    02-18-2012, 05:50 PM Go to last post
  41. Probability of a team making the finals

    Hi, I am trying to find how to calculate the probability of "x" number of events happening within "y" opportunities. However each opportunity has...

    Started by listmanager‎, 02-28-2012 08:00 PM
    probability, probability distributions, probability help, probability question, probability theory
    • Replies: 7
    • Views: 2,024
    02-28-2012, 09:36 PM Go to last post
  42. Help me get started setting up an elementary problem for use with a monte carlo sim

    I want to further understand monte carlo simulations. I have a business and I want to correctly set up a problem to find the likelihood of future...

    Started by dude‎, 04-13-2012 07:06 PM
    • Replies: 7
    • Views: 2,678
    04-16-2012, 01:31 PM Go to last post
  43. ball drop in a maze

    A ball bearing is dropped at the top of the maze (see diagram). It has a 50% chance of going left or right at each junction. Find the probability...

    Started by Hans Rudel‎, 04-24-2012 01:13 PM
    • Replies: 7
    • Views: 4,051
    04-27-2012, 02:33 PM Go to last post
  44. Measure Variability of data points

    I'm struggling to find the appropriate solution to a project that I'm working on. I am trying measure the variability of lead time on products that...

    Started by mschweinzger‎, 06-06-2012 03:29 PM
    • Replies: 7
    • Views: 2,954
    06-08-2012, 08:17 AM Go to last post
  45. why this equation is correct?

    Anybody can tell me why this equation is correct? \sum^{n}_{s=k} {n\choose s}\textit{P}\{X(t)\geq j\}^{s}\textit{P}\{X(t) <...

    Started by Target‎, 07-07-2012 07:07 AM
    • Replies: 7
    • Views: 2,383
    07-08-2012, 02:48 AM Go to last post
  46. Difficult probability question

    I've gotten this off another forum (it hasn't been solved yet), and thought you guys might enjoy this problem. I don't need it solved as it's not my...

    Started by derksheng‎, 08-08-2012 11:35 PM
    • Replies: 7
    • Views: 1,893
    08-09-2012, 10:20 AM Go to last post
  47. Curious read Chi-sq table

    for the rejection of hypothesis (2-tailed) with p=0,05 which chi-square table is correct, in example d.f.=4 and alpha=0,05. is it 0,484 (left) and...

    Started by sg2kilo‎, 09-10-2012 11:04 AM
    • Replies: 7
    • Views: 3,592
    09-10-2012, 09:47 PM Go to last post
  48. A question about the distribution of random numbers - PART II

    Thanks to BGM and Dragan, my problem posted under the thread " A question about the distribution of random numbers" now appears to be solved! The...

    Started by BigBugBuzzz‎, 09-20-2012 08:59 AM
    • Replies: 7
    • Views: 1,547
    09-20-2012, 05:12 PM Go to last post
  49. JaVale McGee

    Hey friends. I decided that being an NBA all-star, author, rapper, actor, father, role model, PhD, and Nobel Prize winner wasn't enough. So I...

    Started by Shaq's Left Nut‎, 10-03-2012 08:17 PM
    • Replies: 7
    • Views: 1,739
    10-05-2012, 01:10 PM Go to last post
  50. Probability of selecting buckets with items

    Given n buckets, each bucket containing m items, we want to select k items. Selecting an item means that the corresponding bucket is selected too. ...

    Started by RandomVariable‎, 10-08-2012 09:55 PM
    combinatorics, probability
    • Replies: 7
    • Views: 1,939
    10-09-2012, 09:05 AM Go to last post
  51. Find distribution function of Y given density function of X and Y as a function of X.

    Hello! Let X have the density function f(x)=2x, 0 < x < 1 and Y = 2X + 1 Find the distribution function of Y, F_Y . I solved X =...

    Started by Slime‎, 12-04-2012 11:00 PM
    • Replies: 7
    • Views: 2,952
    12-05-2012, 01:20 PM Go to last post
  52. 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: 4,147
    12-17-2012, 12:18 PM Go to last post
  53. Probability of machine failure question

    Hi, While I'm an engineer, and have training in stats and probability, those aren't exactly my strong points, so I thought I'd ask you folks --...

    Started by alan speakman‎, 01-19-2013 12:24 PM
    • Replies: 7
    • Views: 4,016
    01-20-2013, 02:43 AM Go to last post
  54. probability of events in a row with binomial

    Hi, Suppose I have an event with probability p. I understand how to use the binomial formula to find the probability of k occurrences of that...

    Started by blmdzr‎, 05-04-2013 11:42 AM
    • Replies: 7
    • Views: 2,560
    05-07-2013, 06:23 AM Go to last post
  55. Basic probability question

    This is a probability question centered around some pseudo code, enjoy! n<-number of rows(x) max<-x for (i in 1 to n) do if x > max then...

    Started by murwebb‎, 01-05-2013 06:08 PM
    probability
    • Replies: 7
    • Views: 1,901
    01-07-2013, 03:16 PM Go to last post
  56. How to calculate the probability between two normal distributions?

    Using the normal distribution. Let X  N(1, 2) and Y  N(2, 3) where N(μ, variance) denotes the normal distribution with mean μ and variance . X...

    Started by supremerule8‎, 02-21-2013 04:51 PM
    normal distribution, probability density, variance
    • Replies: 7
    • Views: 2,433
    02-21-2013, 07:42 PM Go to last post
  57. Poisson

    The number of pacients that get into the hospital is 36 per day. Wich is the probability that in one hour 4 pacients get in.

    Started by yonerflash‎, 05-25-2013 08:59 AM
    poisson
    • Replies: 7
    • Views: 2,055
    05-27-2013, 07:18 PM Go to last post
  58. Game Coding: Calculating The Stat Growth Chance Over Several Levels

    Hello! I'm working on a computer game, specifically character creation. The game uses an attribute growth system identical to the one in the Fire...

    Started by secv‎, 07-16-2013 09:59 AM
    level up, stat growth, video game
    • Replies: 7
    • Views: 2,124
    07-16-2013, 02:40 PM Go to last post
  59. Lightbulb Probability Question

    Working through an sample paper for an upcoming exam and I've been struggling with the following stock trading problem "A total of 576 such...

    Started by Charlie Day‎, 07-29-2013 03:52 PM
    • Replies: 7
    • Views: 1,785
    07-30-2013, 11:17 AM Go to last post
  60. Poisson Distribution Question: Probability, Mean and Variance

    Just Slow Down is a public awareness campaign in Winnipeg to help drivers understand the relationship of excessive speed to traffic collisions,...

    Started by Trae88‎, 10-27-2013 07:57 PM
    • Replies: 7
    • Views: 2,467
    10-27-2013, 10:37 PM Go to last post

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