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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: 30,183
    09-30-2005, 09:44 AM Go to last post
  1. Red face probability help

    :shakeheadCan anyone please help me solve these problem or reccommend which book that i can find on the net to solve these problem Q1.)The...

    Started by Luke Luvevou‎, 08-19-2010 08:13 PM
    • Replies: 1
    • Views: 4,942
    08-19-2010, 09:02 PM Go to last post
  2. standard deviation / level of significance.

    In the manufacturing process of a particular painkiller, a machine is regulated to dispense 32 mg of caffeine per tablet. The machine will need...

    Started by sweetx‎, 11-02-2006 09:24 PM
    • Replies: 2
    • Views: 4,937
    11-04-2006, 11:14 AM Go to last post
  3. Mice in a maze probability puzzle

    Iíve got a probability puzzle I am trying to solve and was hoping somebody could help. It comes from some chemistry experiments Iím doing, and not...

    Started by chrisj‎, 08-08-2008 11:43 AM
    • Replies: 2
    • Views: 4,921
    08-13-2008, 10:51 AM Go to last post
  4. Convergence in probability

    Hi, Can you please help me with the following question? Any hints, ideas would be much appreciated. Suppose that the sequence Xn converges to...

    Started by alien‎, 09-24-2007 05:50 PM
    • Replies: 4
    • Views: 4,913
    09-26-2007, 09:29 AM Go to last post
  5. Exclamation scrabble probability =]

    if im the first to draw all 7 SCRABBLE tiles what is the probabiltiy ill get an X and J? another question: what is the probabilty ill get...

    Started by blargh‎, 05-14-2008 06:34 PM
    • Replies: 1
    • Views: 4,911
    05-14-2008, 09:05 PM Go to last post
  6. Exponential Distribution Lifetime problem

    The average lifetime is 10 hours = 1/lambda Lambda = 1/10 Find the probability of 2 independent items with average lifetime >= 11 hours. ...

    Started by StatStudent3‎, 11-01-2010 09:54 AM
    • Replies: 3
    • Views: 4,911
    11-01-2010, 10:32 AM Go to last post
  7. Need some help understanding probability theory.

    Hello, My probability course has just started and I have a little trouble in preparation for my first quiz tomorrow, understanding some concepts....

    Started by c2q‎, 09-19-2010 04:41 PM
    • Replies: 5
    • Views: 4,908
    09-19-2010, 10:02 PM Go to last post
  8. Need a Probability Answer

    hello , i read a bit from the forum and i saw that i still do not have a answer to my propability question. The situation is like this How to...

    Started by k_rukov‎, 07-28-2011 07:11 PM
    • Replies: 8
    • Views: 4,906
    08-21-2011, 03:57 PM Go to last post
  9. Standard Deviation problem...

    At a motor repair shop, a mechanic can tune-up a car in an average of 30 minutes with a standard deviation of 5 minutes. Assume that the time it...

    Started by Taka‎, 11-02-2005 07:26 AM
    • Replies: 5
    • Views: 4,901
    11-02-2005, 03:01 PM Go to last post
  10. Bunch of questions (just need help not answers)

    Like the title says, I have a bunch of problems that I don't know how to solve. I learn from looking at examples and trying to figure it out (this...

    Started by pensfan10‎, 10-16-2008 02:07 PM
    • Replies: 9
    • Views: 4,901
    10-23-2008, 10:01 AM Go to last post
  11. Help for this question

    Suppose that two players A and B are trying to throw a basketball through a hoop. The probability that player A will succeed on any given throw is...

    Started by splatapus‎, 02-20-2013 07:58 PM
    • Replies: 2
    • Views: 4,898
    02-21-2013, 10:23 AM Go to last post
  12. Expected value of logarithm of determinant of Wishart-distributed matrix

    Does anyone know a simple, or at least tractable, formula for E, where W is a real Wishart-distributed matrix? It seems like there ought to be one,...

    Started by Daniel Dvorkin‎, 11-27-2011 03:16 PM
    determinant, log-determninant, multivariate, wishart
    • Replies: 3
    • Views: 4,894
    11-27-2011, 11:52 PM Go to last post
  13. Red face Bayes Theorem application

    Prior probabilities if diseases are based on the physicianís assessment of factors such as geographic location, seasonal influences, and occurrence...

    Started by ana_talkstats‎, 08-01-2008 02:39 PM
    • Replies: 1
    • Views: 4,892
    08-03-2008, 12:55 PM Go to last post
  14. Help with basic proportions

    The Saloon claims that their pints, on average, are 16 ounces. To test whether the Saloon is actually pouring LESS than 16 ounces (at the .025...

    Started by brownclown‎, 10-11-2010 08:02 PM
    • Replies: 0
    • Views: 4,892
    10-11-2010, 08:02 PM Go to last post
  15. probability problem.. help?

    I have a question using the uniform probability where c=4 and d=10 Find k where P(2≤X≤k)=0.6 so (k-2)(1/6)=0.6 k-2=1 k=3 correct? TIA!

    Started by baby2k1‎, 04-27-2008 02:28 AM
    • Replies: 1
    • Views: 4,887
    04-27-2008, 10:23 PM Go to last post
  16. please i need help with my HW

    hello i have question in my home work that i was tried to solve it but unfortunate i can't the question: Harrison Water Sports has three...

    Started by saddawyah q6r‎, 11-19-2011 08:03 AM
    • Replies: 4
    • Views: 4,883
    11-19-2011, 02:37 PM Go to last post
  17. 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: 4,882
    10-21-2010, 06:41 AM Go to last post
  18. How to apply a distribution and derive a failure rate?

    please excuse me for my newbie question. certain factors influence the power requirements for my system which comprises of several components. i...

    Started by ChootarLaal‎, 10-27-2008 10:28 AM
    • Replies: 4
    • Views: 4,879
    10-27-2008, 01:18 PM Go to last post
  19. p-value to compare agreement between 2 methods

    I have 2 methods which, given a list of variables, put these variables into an order. So imagine I have 20 possible variables,...

    Started by tastico‎, 08-04-2008 08:07 AM
    • Replies: 2
    • Views: 4,878
    08-04-2008, 12:51 PM Go to last post
  20. Poisson question

    Can anyone shed some light on this one? When cycling home at night, I notice that sometimes my rear light is switched off when I arrive home....

    Started by Youler‎, 06-05-2012 08:55 AM
    • Replies: 1
    • Views: 4,875
    10-27-2013, 07:25 PM Go to last post
  21. probability and the normal curve

    I am in grad school getting a master's in education. I am currently enrolled in a stats class and I am not too good at math and definitely not stats....

    Started by PedroNotTheLion‎, 06-23-2009 10:28 PM
    • Replies: 4
    • Views: 4,872
    06-24-2009, 07:55 PM Go to last post
  22. basic proofs/results in regression

    I'm taking a regression class and were working on the location model just to get practice before the real thing. We've been given some proofs for HW...

    Started by learningstats‎, 09-14-2008 10:04 AM
    • Replies: 2
    • Views: 4,867
    09-14-2008, 02:50 PM Go to last post
  23. uniform distribution

    A bus travels between Glasgow and Edinburgh, which we suppose are 78km apart. If the bus has a breakdown, the distance from breakdown to Glasgow has...

    Started by xixihaha‎, 11-25-2008 06:00 PM
    • Replies: 5
    • Views: 4,865
    11-26-2008, 09:27 AM Go to last post
  24. Review this Probability math

    Hi, I'm a new user looking for assistance in a single probability equation: So to try to help convey my problem as clear as possible I'll list my...

    Started by nbccc12‎, 02-09-2011 02:08 AM
    • Replies: 1
    • Views: 4,862
    02-09-2011, 05:21 AM Go to last post
  25. Question How to show that this is chi-square distribution?

    I have something like 2 Sum from i=1 to n {X^2 / Theta^2} where X is Wei(Theta,2) it is distributed chi-square 2n but I do not know where to start....

    Started by grl‎, 04-03-2010 05:45 PM
    • Replies: 1
    • Views: 4,858
    04-05-2010, 03:21 AM Go to last post
  26. Sojourn time of birth and death process

    Hello, I'm having trouble working out the sojourn times and the lecture notes are no help. So far all I know is that they are independently and...

    Started by stats_noob‎, 05-03-2010 07:22 AM
    • Replies: 2
    • Views: 4,858
    05-04-2010, 01:40 AM Go to last post
  27. Probability Question

    Q 1: A teacher walks, cycles or drives to school with probabilities 0.1, 0.3 and 0.6 respectively. If she walks to school she has a probability of...

    Started by AMI‎, 10-20-2008 05:17 AM
    • Replies: 6
    • Views: 4,857
    10-21-2008, 10:19 PM Go to last post
  28. Order Statistics Min/Max problem

    4 people agree to meet at a cafe shop at noon. The mean is noon, with SD of 5 minutes. What is the chance that some of the 4 don't arrive by 12:15? ...

    Started by StatStudent3‎, 11-04-2010 06:48 PM
    • Replies: 1
    • Views: 4,842
    11-04-2010, 08:45 PM Go to last post
  29. correlation and covariance

    1) Suppose that two random variables X & Y are jointly distributed according to the pdf f(x,y)=8xy , 0<=y<=x<=1. What is the correlation coefficient...

    Started by thandu3‎, 02-14-2009 11:16 PM
    • Replies: 2
    • Views: 4,835
    02-15-2009, 10:59 AM Go to last post
  30. Cool a binomial probability question

    please help... Steele Electronics, Inc. sells expensive brands of stereo equipment in several shopping malls throghout the northwest section of...

    Started by mllgk‎, 12-17-2006 04:18 PM
    • Replies: 3
    • Views: 4,834
    12-20-2006, 05:25 PM Go to last post
  31. Joint Independent Normal Random Variable question

    This is not a HW problem, however, there are other parts to this problem(I'm giving part (a), but only parts (b) and (c) are assigned), and I'm...

    Started by StatStudent3‎, 11-11-2010 06:13 PM
    • Replies: 3
    • Views: 4,819
    11-11-2010, 09:57 PM Go to last post
  32. drawing more than one marble at random

    Hi, Can you please check my solutions? I guess, I have got them right.Thanks Probability 1) If four marbles are drawn at random from a bag that...

    Started by SadieKhan‎, 08-21-2011 10:35 PM
    • Replies: 4
    • Views: 4,818
    08-22-2011, 08:30 AM Go to last post
  33. comparing pass/fail rates among teachers

    Suppose there are 1,050 students all age 15 and each student is randomly assigned to one of seven different teachers. However, teachers are allowed...

    Started by greg30043‎, 10-01-2012 10:20 PM
    • Replies: 6
    • Views: 4,817
    10-05-2012, 08:15 AM Go to last post
  34. Conditional probability density function, practical example

    Greetings to all the ones who are accepting to help people and greeting to the ones who are browsing in the forum! We have 2 independent random...

    Started by Baillya‎, 10-02-2012 03:44 AM
    • Replies: 2
    • Views: 4,814
    10-03-2012, 03:07 AM Go to last post
  35. Probabilty : Round permutation problem

    A garland is to be formed with five roses and five dahlias. If they are arranged randomly, find the probability of roses and dahlias being arranged...

    Started by ak4su‎, 03-10-2011 07:51 AM
    • Replies: 5
    • Views: 4,812
    03-14-2011, 09:53 AM Go to last post
  36. Arrow Kurtosis and Skewness Risk

    Hi I was wondering if anyone knew how to adjust for non-zero skewness and kurtosis so that the standard deviation measure becomes an adequate...

    Started by qwe789123‎, 10-31-2009 08:31 PM
    • Replies: 0
    • Views: 4,811
    10-31-2009, 08:31 PM Go to last post
  37. Question Probability of a "success" n or more times out of 10

    Hello everyone! This is my first post on these forums. :) I've got a bit of a curiosity that I've been trying to figure out for a few days. I'm not a...

    Started by JeroMiya‎, 06-16-2007 09:30 AM
    • Replies: 2
    • Views: 4,807
    06-17-2007, 08:26 AM Go to last post
  38. need help with proof issues

    1) given: (1+x)^n =SUM nCk X^k, prove that SUM nCk p^k q^n-k =1,where p+q=1 2)prove the general law of addition:P(E1 U E2 U......U En)=SUM...

    Started by sajee3a‎, 09-13-2010 02:28 PM
    • Replies: 14
    • Views: 4,807
    09-14-2010, 04:04 PM Go to last post
  39. Help Needed

    Textbook publishers must estimate the sales of new (first-edition) books. The records of one major publishing company indicate that 10% of all new...

    Started by tharril‎, 04-22-2010 07:30 AM
    • Replies: 1
    • Views: 4,804
    04-25-2010, 12:42 AM Go to last post
  40. de Morgan's law

    I need help. I just can't figure out where to go with this one.. For two events A and B show that: P(A intersection B) is greater than or...

    Started by tyankee‎, 09-01-2008 03:56 PM
    • Replies: 1
    • Views: 4,798
    09-02-2008, 03:12 AM Go to last post
  41. density function for X^2Y^2 and max(X,Y)

    Hi guys i am struggling in how to find the density function for X^2Y^2 and max(X,Y). Here's the scenario: Suppose a random variable X has the...

    Started by kingkong‎, 06-15-2011 11:47 AM
    • Replies: 3
    • Views: 4,796
    06-16-2011, 03:05 AM Go to last post
  42. Question Cycle of permutation Problem

    Dear everyone, I have questions about cycle of permutation. Here are the questions. For ones who haven't heard about cycle, Anyway, I...

    Started by ilhamdoank‎, 10-26-2011 06:10 PM
    • Replies: 3
    • Views: 4,796
    01-30-2012, 01:04 AM Go to last post
  43. Posterior Probability using Bayes Law with non-mutually exclusive events

    The problem: The prior probabilities for events A1 and A2 are P(A1)=.25, and P(A2)=.75. The conditional probabilities for event E given A1 and A2...

    Started by kened‎, 06-09-2011 11:25 AM
    • Replies: 2
    • Views: 4,793
    06-09-2011, 12:19 PM Go to last post
  44. Question How would I calculate triple coin flipping in sets?

    Say you have three pennies. You throw them all in the air and record the way they land. Then you do this five more times for a total of six throws: ...

    Started by pennyman‎, 02-19-2011 06:15 PM
    • Replies: 4
    • Views: 4,792
    02-19-2011, 08:33 PM Go to last post
  45. 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: 4,789
    01-13-2011, 01:18 PM Go to last post
  46. Help

    Hello, Here is the problem: "Assume the heights of high school basketball players are normally distributed. For boys the mean is 74 inches with...

    Started by AlexKom‎, 01-22-2006 09:02 PM
    • Replies: 2
    • Views: 4,788
    01-23-2006, 05:49 AM Go to last post
  47. looking for algorithm for weighted random choice

    The subject line probably doesn't quite call it what it's supposed to be called but, anyway, here's the problem: Just for the sake of argument,...

    Started by m3p‎, 11-22-2008 03:33 PM
    • Replies: 1
    • Views: 4,788
    11-23-2008, 01:02 PM Go to last post
  48. 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: 4,788
    09-10-2010, 02:37 PM Go to last post
  49. Question Find Maximum Likelihood Estimator of Gamma Distribution

    Find Maximum Likelihood Estimator of Gamma Distribution Given: f(x; β) = * x * e^(-x/ β) for 0 < x < infinity EX = 2β and VarX =...

    Started by Ceci020‎, 02-25-2012 08:03 PM
    • Replies: 0
    • Views: 4,788
    02-25-2012, 08:03 PM Go to last post
  50. mean and variance of a beta distribution

    I'm trying to do point (b) of exercise 3.30 of the book "Statistical Inference" (Casella & Berger). The exercise says: "Use the identities of...

    Started by Kiuhnm‎, 10-11-2013 11:02 AM
    beta distribution, exponential family
    • Replies: 2
    • Views: 4,783
    10-12-2013, 09:53 AM Go to last post
  51. Need help to prove professor may have altered grades at our university

    We had a class of 15 students who took an exam: test scores were: 56, 65, 65, 54, 28, 65, 55, 47, 68, 41, 71, 86, 65, 67, 65 respectively on a non...

    Started by swamifez‎, 10-04-2014 04:36 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,783
    10-05-2014, 07:45 PM Go to last post
  52. stuck on probability

    I'm just about done my 2nd assignment and find when I stay at it too long I start to space-out on some of even the more seemingly easier items. I...

    Started by greenatstats‎, 11-06-2005 10:13 PM
    • Replies: 10
    • Views: 4,782
    11-07-2005, 05:48 PM Go to last post
  53. Probability that a number in a group of numbers to be less than the average of group

    Hi, I am new to probability and would like to know how to find the probability that a number in a group of numbers is less than the average of that...

    Started by amanjsingh‎, 05-19-2008 06:05 PM
    • Replies: 2
    • Views: 4,780
    05-19-2008, 07:12 PM Go to last post
  54. Random sample probability with no max population size

    Hi all, I have no clue what to do with the following question... In a random sample of 20 cassettes, what is the probability that at least two...

    Started by Tjvelcro‎, 10-21-2010 08:47 PM
    • Replies: 1
    • Views: 4,780
    10-21-2010, 08:55 PM Go to last post
  55. need help with a few questions

    the question is: A shrub that is purchased at a local nursery has probability .80 of surviving the first year. If a customer pruchases 4 shrubs,...

    Started by Brittany Freilinger‎, 07-11-2007 12:26 PM
    • Replies: 1
    • Views: 4,778
    07-13-2007, 03:55 AM Go to last post
  56. Expected Value & Variance from Z = min (X,Y)

    Dear all, I have an assignment, but I don't understand yet which formulas I have to use to solve it. Here is the question: There is an...

    Started by statjunior‎, 09-24-2014 12:58 AM
    • Replies: 1
    • Views: 4,777
    09-24-2014, 03:48 AM Go to last post
  57. Desperately needing homework help!

    I tried the math lab at the local college and the statistics professor was as stumped as I was! A videotape has an average of one defect every...

    Started by samiam619‎, 07-24-2007 02:41 PM
    • Replies: 4
    • Views: 4,775
    07-30-2007, 04:02 PM Go to last post
  58. Question New to statistics, but I am trying

    I have been working on this problem for two days, I cannot come up with the correct way to work it. My instructor did not teach this type. The...

    Started by stangerald‎, 05-01-2006 09:03 AM
    • Replies: 1
    • Views: 4,772
    05-01-2006, 09:30 AM Go to last post
  59. Monty Hall cf. Deal or No Deal

    Hi We have been having a (rather heated!) discussion regarding why the Monty Hall problem does/does not apply to Deal or No Deal. Wikipedia states...

    Started by aodonnell‎, 01-20-2009 02:16 PM
    • Replies: 3
    • Views: 4,772
    01-24-2009, 11:28 AM Go to last post
  60. A Drunkard's Random Walk

    Here's a homework problem that I need a hint to get started. D drunkard is taking a random walk. he canstep north or shouth with probability .5...

    Started by statsmom‎, 10-25-2008 11:24 PM
    • Replies: 3
    • Views: 4,770
    10-26-2008, 10:04 PM Go to last post

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