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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: 30,355
    09-30-2005, 09:44 AM Go to last post
  1. Probability of Events - Accident Stats

    I am trying to figure out the likelihood that a series of accidents is either indicative of a problem or not, in other words how rare is this series...

    Started by wolfego‎, 10-08-2010 04:46 PM
    • Replies: 1
    • Views: 6,004
    10-08-2010, 05:27 PM Go to last post
  2. 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: 6,003
    02-06-2012, 09:27 PM Go to last post
  3. Reading z-tables when you know the probability

    I'm having trouble reading z tables. If anyone can help I'd be thankful as I feel I can't move on until I know how to do this. One of the...

    Started by LiquidMoon‎, 11-18-2010 02:06 PM
    • Replies: 2
    • Views: 5,993
    12-03-2010, 10:40 AM Go to last post
  4. 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: 5,980
    01-10-2011, 05:02 PM Go to last post
  5. Correlation of the product of 2 multivariate normal variables...

    hello everyone! i've got a quick theoretical question that i'm gearing towards a simulation exercise but i need to get my stuff right first... ...

    Started by spunky‎, 07-25-2011 11:16 PM
    • Replies: 12
    • Views: 5,978
    07-28-2011, 01:33 AM Go to last post
  6. Finding UNcondintional Mean and Variance of U

    Good evening! I am working through this problem and searched online and found the solution, which makes a lot of sense, but am not quite sure...

    Started by S-C-3-1-3‎, 02-01-2013 02:57 AM
    • Replies: 8
    • Views: 5,966
    02-03-2013, 09:43 AM Go to last post
  7. Percentage overlap of two gaussian distributions

    I would like to know how to calculate the overlap between two one dimensional gaussian distributions. Here is my approach: 1) Find the point, x*,...

    Started by tuesday‎, 04-23-2008 07:15 PM
    • Replies: 0
    • Views: 5,962
    04-23-2008, 07:15 PM Go to last post
  8. Hypergeometric Random Variable help!

    Here's the question, I've tried all the formulas given to me in the chapter, and none are working. I'm guessing to use the mean and...

    Started by dbm4891‎, 10-24-2011 02:30 PM
    • Replies: 4
    • Views: 5,959
    10-24-2011, 03:01 PM Go to last post
  9. Permutation Problem - help me understand pls!

    I am reading this example about permutation and can't understand how to go about rationalize it. Example: Suppose that 2 anthropology, 4 computer...

    Started by gavinwkc‎, 01-30-2007 04:44 AM
    • Replies: 1
    • Views: 5,932
    01-31-2007, 06:17 AM Go to last post
  10. Black Jack Anyone?

    Using the hypergeometric probability function below: P(x) = (r/x)((N-r)/(n-x))/(N/n) P(x) = probability of x success in n trials n = number of...

    Started by Parillamaster‎, 02-13-2006 11:29 AM
    • Replies: 3
    • Views: 5,930
    02-13-2006, 03:02 PM Go to last post
  11. Project ideas for probability n stats

    I needed ideas to prepare a project which has application of probability or stats in some form. The project contains a significant programming part...

    Started by pearl‎, 09-23-2010 12:04 PM
    • Replies: 0
    • Views: 5,924
    09-23-2010, 12:04 PM Go to last post
  12. Probability of events occuring at the same time?

    Hi! I'm having a bit of trouble calculating a probability as my statistics are a little bit rusty. Basically, I have 25 independant Wireless G...

    Started by thedash‎, 07-22-2009 02:39 PM
    • Replies: 4
    • Views: 5,915
    07-24-2009, 11:24 AM Go to last post
  13. comparing two Poissonians

    What is the proper statistical test for the following: I know A1 and A2 to be Poisson distributed with (unknown) means x1 and x2. I have a single...

    Started by ee00‎, 06-21-2010 11:05 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 5,912
    06-23-2010, 12:36 PM Go to last post
  14. Question Probability

    Ok I am very new to stats and am very confused. I went to the examples board and now am even more confused. Here is the problem. Ok they offer a...

    Started by jaben‎, 11-15-2005 11:35 AM
    • Replies: 13
    • Views: 5,907
    11-15-2005, 03:11 PM Go to last post
  15. 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: 5,897
    07-15-2010, 01:58 PM Go to last post
  16. Question probability problem

    For detecting a disease, a test gives correct diagnosis with probability 0.99. It is known that 1% of the population suffers from this disease. If a...

    Started by Sambit‎, 02-21-2011 11:36 AM
    • Replies: 5
    • Views: 5,890
    03-10-2011, 08:19 AM Go to last post
  17. Silly baseball question.

    I know I'm new, but it's not really my intention to just jump on here and post something and then never post again, honestly I don't know why I...

    Started by elevenspades‎, 04-19-2007 06:31 PM
    • Replies: 2
    • Views: 5,883
    04-22-2007, 08:57 PM Go to last post
  18. Post test question

    At a large department store, the average number of years of employment for a cashier is 5.7 with a standard deviation of 1.8 years and the...

    Started by dailya1‎, 10-17-2010 09:28 PM
    • Replies: 1
    • Views: 5,876
    10-17-2010, 11:18 PM Go to last post
  19. First forum visit ever. Questions

    I'm taking an online statistic course and am having a very hard time with it. I think my biggest problem is setting up the problems. Could someone...

    Started by SunDog‎, 06-23-2008 03:41 PM
    • Replies: 2
    • Views: 5,871
    06-24-2008, 12:05 PM Go to last post
  20. Two part PMF for a Joint Distribution problem

    Suppose X and Y have the following joint distribution p(x, y) = c(x^2 + y^2). For x = -1, 0, 1, 3 and y = -1, 2, 4: A) Find the value of c that...

    Started by Dantevus‎, 12-08-2010 09:12 AM
    • Replies: 2
    • Views: 5,869
    12-08-2010, 10:26 AM Go to last post
  21. Standard deviations and profits?

    So this is another question I attempted to solve but was stuck on the 2nd part of it: A store knows that the number of pies sold each day varies...

    Started by probablyme‎, 02-25-2008 02:52 AM
    • Replies: 1
    • Views: 5,860
    02-25-2008, 01:16 PM Go to last post
  22. Help with Conditonal Probability

    I think this is a classic problem. :) Oscar has lost his dog in either forest A (with a priori probability 0.4), or in forest B (with a priori...

    Started by lilaznjedi‎, 06-08-2007 08:05 AM
    • Replies: 1
    • Views: 5,854
    07-03-2007, 01:08 PM Go to last post
  23. Joint Probability Distribution

    Joint Probability Distribution for Random Variable X and Y? Three cards are drawn without replacement from 12 face cards (Jacks, Queens, and Kings)...

    Started by ARCHCOS‎, 03-09-2011 02:26 PM
    • Replies: 3
    • Views: 5,849
    03-10-2011, 04:56 AM Go to last post
  24. birth defects - probability

    I am new and really stuck with this one: Analyzing cases of a rare congenital defect>>>>>>>>>>>>> 1 female in 30 in the population carries the...

    Started by free‎, 04-22-2008 03:54 AM
    • Replies: 3
    • Views: 5,844
    04-25-2008, 01:26 PM Go to last post
  25. Expected value of ratio: please help!

    Hello, I am trying to find an unbiased estimator for E(X/Y), where X is Normal(mu_1,sigma_1) and Y is Normal (mu_2,sigma_2). Does anyone happen...

    Started by jmill40000‎, 03-19-2010 02:49 PM
    • Replies: 1
    • Views: 5,843
    03-19-2010, 04:38 PM Go to last post
  26. Simple marginal effects after probit

    So I have cannot find pretty much any basic information on marginal effects after probit in STATA on the net or my textbooks, so any help would be...

    Started by sif‎, 11-29-2010 08:39 PM
    • Replies: 0
    • Views: 5,842
    11-29-2010, 08:39 PM Go to last post
  27. Homework Problem- Normal Distribution/Standard Deviation

    Hi there, I've been working through my homework problems and this one has totally stumped me in terms of where to start in order to complete the...

    Started by KarolynBA‎, 08-12-2011 04:54 PM
    • Replies: 6
    • Views: 5,839
    08-14-2011, 07:40 AM Go to last post
  28. finite variance

    Hi there, if X is a random variable and all we know is that it has finite variance. Can we say that X is bounded? If not what is the meaning of...

    Started by leo nidas‎, 04-24-2010 12:20 PM
    • Replies: 2
    • Views: 5,835
    04-25-2010, 12:36 AM Go to last post
  29. distribution function of the division of two variables

    Hello Probably this is a silly question, but its is being resulting a non obvious task for me. Any isight would be welcome. I have a continous...

    Started by mlaspalas‎, 06-25-2007 12:59 PM
    • Replies: 1
    • Views: 5,831
    07-20-2007, 11:44 PM Go to last post
  30. Random Variable/Expected Value Problem (Profit)

    I thought I'd gotten the hang of these, but then the newer problems had different value types that needed to be used. This particular question asks:...

    Started by TR-FIN‎, 11-03-2011 08:47 PM
    • Replies: 2
    • Views: 5,820
    11-03-2011, 11:57 PM Go to last post
  31. probability

    a pharmaceutical firm claims that a certain medication is 92% effective in relieving arthric pain. if ten people who suffer from arthritis are...

    Started by sweetlady‎, 09-01-2006 08:47 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 5,819
    09-21-2006, 08:28 AM Go to last post
  32. Specific set number generator

    Hi, I`m totally newbie in statistic and i would like to ask for help. I need to write a program for generating a list of numbers from a specific...

    Started by eyej‎, 12-11-2009 10:48 PM
    • Replies: 1
    • Views: 5,803
    12-11-2009, 11:19 PM Go to last post
  33. Poisson distribution and moment generating function question

    This is a problem my professor assigned for homework. He said if we can't do it, it's not a big deal; it's a difficult problem. I'd still like to...

    Started by APOCooter‎, 02-05-2012 02:49 PM
    • Replies: 3
    • Views: 5,800
    02-05-2012, 04:45 PM Go to last post
  34. Conditional Probability

    I've been working on this one for the last 3 days to no avail. The problem is this: "A statistics professor wants to ensure that she is not late...

    Started by mrkvvlt‎, 08-14-2006 06:20 PM
    • Replies: 1
    • Views: 5,798
    08-15-2006, 09:59 PM Go to last post
  35. Probability: Sums and Products of Random Variables

    Suppose that X is uniformly distributed on (0,2), Y is uniformly distributed on (0,3), and X and Y are independent. Determine the distribution...

    Started by dizzle1518‎, 05-11-2011 05:44 PM
    • Replies: 1
    • Views: 5,788
    05-11-2011, 09:53 PM Go to last post
  36. Can you get me started?

    A television store owner figures that 45% of the customers entering the store will purchase an ordinary television set, 15% will purchase a plasma...

    Started by teacher2be‎, 11-06-2006 08:34 PM
    • Replies: 7
    • Views: 5,783
    11-09-2006, 07:39 AM Go to last post
  37. A question about the distribution of random numbers

    Suppose I have two independent random variables A, and B, which are distributed Normally as follows: A: N~(MA,VA) B: N~(MB,VB) Now consider...

    Started by BigBugBuzzz‎, 09-18-2012 09:06 AM
    3 Pages
    1 2 3
    • Replies: 30
    • Views: 5,783
    09-20-2012, 08:35 AM Go to last post
  38. Exclamation Binomial Distribution

    A company starts a fund of M dollars from which it pays $1000 to each employee who achieves high performance during the year. The probability of...

    Started by Takumi‎, 02-08-2014 02:08 AM
    binomial distriubtion, probability, statistics
    • Replies: 3
    • Views: 5,783
    02-08-2014, 02:10 PM Go to last post
  39. Conditional Probability using Bayes' Theorem

    Hello, I am trying to solve this conditional probability question: A certain college has observed that 20% of its freshmen are unqualified and drop...

    Started by S-C-3-1-3‎, 09-23-2012 10:36 PM
    • Replies: 8
    • Views: 5,782
    09-24-2012, 02:33 PM Go to last post
  40. Probability exam questions with worked-out solutions

    Students can download from http://personal.vu.nl/h.c.tijms/ExamQuestionsUP.pdf a collection of more than 150 probability exam questions with fully...

    Started by chris ball‎, 04-26-2013 03:53 AM
    • Replies: 0
    • Views: 5,779
    04-26-2013, 03:53 AM Go to last post
  41. Normal approximation and also a problem with hypothesis testing

    I need a little help with the formulas here. Im not sure if I am doing this right. Records show that 29% of all payments to a mail-order company...

    Started by theevilp0ptart‎, 11-21-2009 09:47 PM
    • Replies: 0
    • Views: 5,772
    11-21-2009, 09:47 PM Go to last post
  42. how many seating arrangements are possible

    Delegates from 8 countries (G8): U.S., U.K., France, Germany, Italy, Russia, Japan and Canada are to be seated around a circular table. How many...

    Started by e-norman‎, 09-20-2010 10:54 PM
    • Replies: 2
    • Views: 5,770
    09-29-2010, 08:20 PM Go to last post
  43. Question probability

    regarding poisson, how would you go about solving if a question reads: A hospital has noted that they admit an average of 8 patients per hour. ...

    Started by ecohelp‎, 09-18-2005 10:35 AM
    • Replies: 2
    • Views: 5,766
    09-18-2005, 11:57 AM Go to last post
  44. Moment Generating Function

    If the joint moment generating function of X and Y is M X,Y (t1, t2) = 6 / (1-t1) * and X,Y are the times that required for two tasks to be...

    Started by Darktranquillity‎, 02-22-2012 02:26 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 5,763
    02-23-2012, 01:13 PM Go to last post
  45. Normal approximation

    Given n=200 and p = 0.01 (probability that you will find a customer spending less that $100). Find the probability that you won't find any that spend...

    Started by raamaak‎, 03-20-2011 07:26 AM
    • Replies: 10
    • Views: 5,759
    03-20-2011, 04:05 PM Go to last post
  46. Sequence of chess games

    Person A and Person B play a sequence of chess games. S=(A wins a game) and the outcomes of the successive games are independent with P(S)=P(F)=0.5...

    Started by gator78‎, 10-19-2010 08:28 PM
    • Replies: 9
    • Views: 5,755
    10-24-2010, 07:25 PM Go to last post
  47. Probability and Sampling Distribution Question

    Just before a city referendum on a school budget, a local newspaper polls 400 voters in an attempt to predict whether the budget will pass. Suppose...

    Started by deron.washington‎, 03-25-2008 10:38 PM
    • Replies: 2
    • Views: 5,747
    03-31-2008, 06:36 PM Go to last post
  48. Analyzing test results- Normal Distribution

    Im trying to compare my grade on my Algebra exam to my fellow students using the normal distribution. Here are the results of the exam: ...

    Started by ciddis‎, 06-20-2006 10:02 AM
    • Replies: 0
    • Views: 5,744
    06-20-2006, 10:02 AM Go to last post
  49. Intensity Matrix

    Hi, sorry to keep harassing everyone like this, but I'm stuck again. It's the same setup as the last question, but this time it's asking about the...

    Started by stats_noob‎, 05-05-2010 02:53 AM
    • Replies: 2
    • Views: 5,735
    05-06-2010, 06:14 AM Go to last post
  50. calculate the probability of accident.

    Suppose there are seven(distinct) accident occurs in a week. What is the probability that all accidents are occurred on the same day? Pls explain in...

    Started by sanjeev kumar‎, 12-24-2011 01:24 PM
    • Replies: 6
    • Views: 5,732
    12-25-2011, 06:15 PM Go to last post
  51. Uniform Dist

    Suppose X,Y are uniformly distributed over the unit circle. Let R = sqrt(X^2 + Y^2) and theta=arctan(Y/X). What is the joint pdf of (R, theta)?...

    Started by statsguy‎, 10-26-2010 06:52 PM
    • Replies: 1
    • Views: 5,722
    10-28-2010, 07:24 AM Go to last post
  52. Sampling distribution of standard deviation

    Hi, I need some help, please. If X_i~N(mu, s^2), what is the distribution of sample standard deviation , I mean, with n-1 degree of freedom? ...

    Started by wipeout‎, 05-04-2011 10:11 AM
    • Replies: 3
    • Views: 5,718
    05-04-2011, 02:58 PM Go to last post
  53. Simulate truncated exponential

    Hi, I have to simulate from Exp(1) which is truncated below by 0.5 using the method of inversion. That is simulate a random variable X~Exp(1)...

    Started by PeterVincent‎, 03-18-2009 11:32 AM
    • Replies: 1
    • Views: 5,717
    03-18-2009, 12:43 PM Go to last post
  54. Post Please Help with This question

    A machine fills containers with a particular product. The standard deviation of fillign weights is known from past data to be .6 once. if only 2% of...

    Started by kubotahandyman‎, 11-11-2009 09:43 AM
    • Replies: 1
    • Views: 5,713
    11-11-2009, 11:27 AM Go to last post
  55. Prove finite expectation value

    Hallo, I've got a problem with a proof: I should prove that a r.v. X (>=0) has a finite expectation value iff sum_{i>=1}P(X>i) is finite. I...

    Started by someone‎, 03-20-2010 11:31 AM
    • Replies: 1
    • Views: 5,711
    03-20-2010, 12:48 PM Go to last post
  56. Lottery probability. What if a friend wins?

    As a programmer I've worked a little bit with statistics, but not much with probability. An interesting question has come to mind this week, and it...

    Started by donkeyhotay‎, 03-01-2011 09:35 AM
    • Replies: 8
    • Views: 5,709
    03-03-2011, 04:53 PM Go to last post
  57. Please help me reach the end!

    Before ya slam me let me explain. I foolishly took an online statistics course. I will be failing this class... there is nothing I can do to avoid it...

    Started by MotherBear1975‎, 11-20-2008 02:52 PM
    • Replies: 3
    • Views: 5,692
    11-20-2008, 03:37 PM Go to last post
  58. integral of probability density function

    Hi, I apologize for the almost certainly stupid question. I'm sure somebody must have asked it before but I have searched and cannot find an...

    Started by mockle‎, 06-08-2009 02:12 PM
    • Replies: 2
    • Views: 5,687
    06-08-2009, 04:00 PM Go to last post
  59. "with and without replacement" question

    hi, thanks for taking a look. im stumbling on trying to understand one question. the problem is: a box of nine gloves contains two left handed...

    Started by skrib09‎, 09-10-2009 02:26 PM
    • Replies: 1
    • Views: 5,685
    09-15-2009, 12:39 PM Go to last post
  60. Probability Problem

    Hi all, I have been trying to come up with the correct answer for part c) of this question with no luck. A gumball dispenser has 38 orange...

    Started by biff44‎, 02-22-2008 01:42 PM
    • Replies: 4
    • Views: 5,684
    02-22-2008, 04:09 PM Go to last post

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