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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: 30,178
    09-30-2005, 09:44 AM Go to last post
  1. Exclamation Simple birth-death process

    Hello, I am working on a simple birth-death process problem, I have been asked to find the distribution function for the extinction time T. So T...

    Started by Amelia‎, 11-08-2009 05:27 AM
    • Replies: 0
    • Views: 4,164
    11-08-2009, 05:27 AM Go to last post
  2. Exclamation Almost sure convergence

    Let Y_n be a simple symmetric random walk on the integers Z, starting in state 0. Define X_n to be 1 if Y_n=0 and 0 otherwise. I have already...

    Started by Amelia‎, 11-22-2009 10:31 AM
    • Replies: 1
    • Views: 4,274
    11-22-2009, 11:05 AM Go to last post
  3. Is this a negative binomial?

    Is this a negative binomial? I understand the solutions. But why am I not getting the right answer using the negative binomial formula? Problem:...

    Started by Amer‎, 04-04-2011 12:04 PM
    negative binomial, probability
    • Replies: 1
    • Views: 2,579
    04-04-2011, 02:04 PM Go to last post
  4. Application of binomial distribution

    Hello all, this is my first post. I am a practicing engineer facing a dilemma. Our resident statistician is out for the MONTH, and I have a deadline...

    Started by amf08006‎, 05-16-2014 08:53 AM
    • Replies: 0
    • Views: 2,173
    05-16-2014, 08:53 AM Go to last post
  5. Cool Probability

    Trying to figure how many ways you can have 4 qualifiers out of a group of 11 if order matters and if order does not matter. Anyone help??? Thanks

    Started by AMG1982‎, 07-06-2009 06:30 PM
    • Replies: 3
    • Views: 2,407
    07-07-2009, 07:58 PM Go to last post
  6. 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: 4,856
    10-21-2008, 10:19 PM Go to last post
  7. Question statistics help

    Hey this is my first time doing this but I am makeing a b in the elementary statistics class that I am in I need help finding out how to find the...

    Started by amiller2‎, 11-07-2005 06:52 PM
    • Replies: 5
    • Views: 3,082
    11-14-2005, 08:24 PM Go to last post
  8. Probability: proving

    Show that two events A,B are independent if and only if at least one of the following holds i) P(A/B)=P(A) or P(B/A)=P(B) ii) P(A)=0 or P(B)=0

    Started by amjadsuhail‎, 10-04-2008 03:20 PM
    • Replies: 1
    • Views: 2,165
    10-04-2008, 03:53 PM Go to last post
  9. Find the joint density of Z=X+Y,W=X-Y

    Question:Let X,Y be independent random variables with X~Exp(lambda1) and Y=~Exp(lambda2). Find the joint density of Z=X+Y,W=X-Y ...

    Started by amjadsuhail‎, 10-04-2008 03:14 PM
    • Replies: 1
    • Views: 5,122
    10-04-2008, 09:14 PM Go to last post
  10. probability

    A congested computer network has a 0.002 probability of losinga data packet and packet losses are independent events. Alost packet must be resent....

    Started by amoeba88‎, 09-22-2013 01:21 AM
    • Replies: 1
    • Views: 4,573
    09-22-2013, 04:30 AM Go to last post
  11. Sampling distribution of the sample proportion.

    A random sample of 20 students is selected. What is the probability that the sample proportion exceeds 75%, i.e., more than 15 students (out of 20...

    Started by amrhamada‎, 12-11-2015 09:02 PM
    binomial distribution, sample, sample distribution
    • Replies: 1
    • Views: 1,320
    12-11-2015, 09:12 PM Go to last post
  12. Bound on the difference of two normal cds

    Let Xi be univariate normal variables with means mi and standard deviations di, with i = 1,2. Suppose |m1-m2| < e1 and |d1 - d2| < e2. I need an...

    Started by amsb‎, 07-31-2010 03:09 PM
    • Replies: 2
    • Views: 2,833
    08-01-2010, 04:30 PM Go to last post
  13. Probablility question

    If the odds of winning a game are 1 in 10 what are the odds of winning that game three times in a row? Thanks for your help!

    Started by amynkaya@yahoo.com‎, 02-16-2015 12:45 PM
    • Replies: 0
    • Views: 991
    02-16-2015, 12:45 PM Go to last post
  14. Probability

    The Honolulu Advertiser stated that in Honolulu there was an average of 659 burglaries per 300,000 households in a given year. In the Kohola Drive...

    Started by amywhitfield‎, 10-10-2013 09:18 PM
    • Replies: 1
    • Views: 3,884
    10-10-2013, 09:27 PM Go to last post
  15. I need help with homework please.

    The teacher just kind of highlights the basics of it and tells us to read the chapter but the book makes absolutely no sense whatsoever. If someone...

    Started by anangelofastar‎, 02-27-2012 10:00 PM
    • Replies: 1
    • Views: 5,106
    02-27-2012, 10:20 PM Go to last post
  16. Log normal distribution

    Hello all, I would like to find a solution to the following problem. Consider I have a variable X log normally distributed with some expected...

    Started by anavia‎, 07-04-2009 03:40 PM
    • Replies: 2
    • Views: 2,671
    07-07-2009, 07:56 AM Go to last post
  17. expected value, uniform distribution

    Hi everyone, i have a weird question and here it goes, if x is uniformly distributed within the region (0,1]. How should I find E where...

    Started by anavia‎, 07-11-2010 05:55 AM
    • Replies: 1
    • Views: 4,316
    07-11-2010, 11:27 AM Go to last post
  18. Red face Bayes Theorem application

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

    Started by ana_talkstats‎, 08-01-2008 02:39 PM
    • Replies: 1
    • Views: 4,890
    08-03-2008, 12:55 PM Go to last post
  19. Exercise doubt

    Hello everyone, I have to do an exercise or probability and i dont know or better if i say im not sure what to do? I know i have three types of...

    Started by Ancelot327‎, 04-12-2011 08:56 PM
    • Replies: 0
    • Views: 2,727
    04-12-2011, 08:56 PM Go to last post
  20. How to calculate probability of two samples

    Hello everyone, Just need advice how to calculate probability of two samples in a 2 x 4 table. so say i have two groups (brown haired people...

    Started by ANCOVA'D‎, 05-25-2016 11:25 AM
    probability
    • Replies: 0
    • Views: 1,573
    05-25-2016, 11:25 AM Go to last post
  21. calculating expectation and variance

    Hi, I wanted to know if i'm on the right track with this problem. So far, for expectation I multiply 15/60 and 12. Not sure if this is correct....

    Started by Andiem‎, 02-01-2009 02:00 PM
    • Replies: 4
    • Views: 5,101
    02-01-2009, 02:17 PM Go to last post
  22. 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: 1,771
    11-04-2012, 11:35 PM Go to last post
  23. Multinomial Distribution - difficult question - SOS

    This has to do with statistics,but the question I don't know the answer to is in probability. I don't know how to solve (b) Please help...

    Started by andrea_lansberg‎, 07-25-2010 04:59 AM
    • Replies: 0
    • Views: 3,057
    07-25-2010, 04:59 AM Go to last post
  24. White's Reality Check test

    Hi, I have a stock dataset for which I have found the "best" trading rule. Now, I need to find out the probability that this is the best trading...

    Started by andreea‎, 03-30-2012 01:33 PM
    • Replies: 1
    • Views: 3,655
    03-30-2012, 03:41 PM Go to last post
  25. Lightbulb inverse of the student`s t-distribution

    Dear All, I have a issue about two-tailed inverse of the student`s t-distribution. I am trying to use calculation for two-tailed inverse of the...

    Started by andreja‎, 10-01-2014 05:52 AM
    • Replies: 0
    • Views: 1,270
    10-01-2014, 05:52 AM Go to last post
  26. Lightbulb inverse of the student`s t-distribution

    Hi All, I am trying to use calculate for two-tailed inverse of the student`s t-distribution function presented by Excel functions like...

    Started by andreja‎, 10-03-2014 11:36 AM
    • Replies: 3
    • Views: 1,736
    10-03-2014, 12:27 PM Go to last post
  27. Conditional probability of functions. Small question

    Hey, i was just looking at a question where the question is calculate: P( B(t) =< x| x=B(s) ). That is, calculate the probability that B(t) is less...

    Started by andreme91‎, 05-12-2016 06:29 AM
    conditional probability, probability
    • Replies: 0
    • Views: 920
    05-12-2016, 06:29 AM Go to last post
  28. Help with Excell and 1 2 and 3 Standar Deviations

    I was given the following data: 45, 89, 78, 85, 47, 25, 56, 99, 100, 98, 65, 65, 65, 56, 35, 53, 58, 57, 54, 89, 78, 75, 75, 72, 83, 84, 75, 82,...

    Started by Andres0286‎, 10-29-2011 02:42 PM
    • Replies: 1
    • Views: 2,358
    10-29-2011, 05:39 PM Go to last post
  29. Risk Analysis questions

    Hi, I'm new on this forum! I have some question about risk analysis, I'm doing some exercices and I don't understand some points. 1) Limit of...

    Started by AndreT‎, 06-10-2016 03:02 PM
    • Replies: 0
    • Views: 1,101
    06-10-2016, 03:02 PM Go to last post
  30. Probability and time

    Hi This is not a homework question, alas school and university are many years ago for me; but I was wondering how you account for time when using...

    Started by Andrewbond‎, 04-14-2007 06:59 PM
    • Replies: 0
    • Views: 2,167
    04-14-2007, 06:59 PM Go to last post
  31. Dice Throwing

    2 dice thrown together for 3 times, what is the probability that for any of the 3 throws, I will get the same number on both dice? Thx ! Andrew

    Started by andrewhzh1‎, 12-16-2010 08:51 AM
    • Replies: 1
    • Views: 3,343
    12-16-2010, 08:56 AM Go to last post
  32. basic probability

    My assignment question gives me the following info regarding the probability of system having 3 types of defects (type A1, A2, and A3): P(A1)=...

    Started by andrewink‎, 09-28-2008 02:49 PM
    • Replies: 1
    • Views: 2,819
    09-28-2008, 06:29 PM Go to last post
  33. Method for Bayes spam filtering

    I am trying to understand the method for Bayesian spam filtering given here http://en.wikipedia.org/wiki/Bayesian_spam_filtering It makes sense...

    Started by andrewz‎, 08-10-2008 04:35 PM
    • Replies: 0
    • Views: 1,677
    08-10-2008, 04:35 PM Go to last post
  34. Infer the best time of day to call?

    I work for a non-profit. We do courtesy calls (no telemarketing) to our existing constituents. Half the calls end up in answering machines. To be...

    Started by andrewz‎, 04-06-2009 06:07 PM
    • Replies: 0
    • Views: 2,843
    04-06-2009, 06:07 PM Go to last post
  35. Quantifying response with variable length history

    I have what I hope is a common a statistics problem. In our non-profit organization we occasionally send people direct mail appeals. The goal is to...

    Started by andrewz‎, 01-05-2010 08:05 PM
    • Replies: 0
    • Views: 2,134
    01-05-2010, 08:05 PM Go to last post
  36. Thumbs up Linear Probability Model problem (Binary dependent variables)

    y i =a+bD i +u i ,i=1,…,n (LPM equation) Always thank you for your helps! I have a question about Linear Probability Model. You can see the...

    Started by androman‎, 10-12-2013 11:34 AM
    binary dependent variable, linear probability model
    • Replies: 0
    • Views: 2,017
    10-12-2013, 11:34 AM Go to last post
  37. Red face Probability and percentiles

    An airline has found from past experience that the weight of checked-in baggage items is Normally distributed with mean 13 kg and standard deviation...

    Started by andy35‎, 09-20-2011 11:50 PM
    • Replies: 0
    • Views: 3,352
    09-20-2011, 11:50 PM Go to last post
  38. Question Will rounding off Standard Deviation Bins cause error on Histogram?

    I am creating a Histogram. I have about 100 points of data and I am using MS Excel's Histogram function to create the "Bins". The data points I have...

    Started by andygarcia‎, 06-25-2010 10:04 AM
    • Replies: 4
    • Views: 6,653
    06-30-2010, 11:34 AM Go to last post
  39. distribution of the range of N independent standard normal variables

    Let x1, x2, ... xn be independent standard normal variables. (standard normal: normal with 0 mean and variance 1). Let the range R be defined as...

    Started by AndyMC‎, 02-19-2010 08:49 AM
    • Replies: 4
    • Views: 7,420
    02-20-2010, 01:07 AM Go to last post
  40. bidding probability

    Hi. I am not overly familiar with statistics. I am preparing a manuscript and I need a formula to determine probability. Here is the problem. ...

    Started by andyploom‎, 03-14-2011 02:45 PM
    • Replies: 0
    • Views: 2,822
    03-14-2011, 02:45 PM Go to last post
  41. die probability

    Two fair dices are thrown and you are told that the sum of upturned face is equal to 7.what is the probabilty that neither face os equal to 6??is it...

    Started by andysim1983‎, 05-04-2009 05:55 AM
    • Replies: 0
    • Views: 1,884
    05-04-2009, 05:55 AM Go to last post
  42. get a distribution of x from y

    Hello I have two variables x and y with a roughly linear relationship and good correlation. I have been given a y value and I want to get a...

    Started by andyspeak‎, 03-13-2015 12:43 PM
    • Replies: 0
    • Views: 1,261
    03-13-2015, 12:43 PM Go to last post
  43. bayes for generating new data

    I am estimating a tree inventory for a city. I have already measured the heights and identified the species for about 1000 trees in some areas of...

    Started by andyspeak‎, 03-01-2017 09:25 AM
    bayes, generate data, spatial statistics
    • Replies: 3
    • Views: 2,159
    03-02-2017, 04:20 AM Go to last post
  44. I think this is binomial???

    I was wondering if anyone can solve this problem and let me know how they did it. I am thinking this is a binomial problem, but I haven't been able...

    Started by anemro‎, 07-28-2008 09:14 PM
    • Replies: 2
    • Views: 2,655
    07-30-2008, 09:34 PM Go to last post
  45. Conditional Probability

    I was hoping someone could shine some light on how to go about solving this question.... A dog has a litter of four pups. Assume, as usual, that...

    Started by anemro‎, 07-27-2008 02:25 PM
    • Replies: 1
    • Views: 2,086
    07-27-2008, 03:18 PM Go to last post
  46. simple random walk

    Hi all, I've a question for u... the mathematical model that explains the experiment of tossing a fair coin is the simple random walk,...

    Started by ang‎, 11-21-2012 10:54 AM
    • Replies: 1
    • Views: 860
    11-21-2012, 11:37 AM Go to last post
  47. Probability Question

    I am a little confused on what formula I should use here. I understand if you don't want to give me the answer. I just want to be pointed in the...

    Started by ang6705‎, 09-18-2010 06:43 PM
    • Replies: 3
    • Views: 2,614
    09-18-2010, 08:50 PM Go to last post
  48. Normal Distribution problem

    Question: an instructor is administering a final examination. She tells her class that she will give an A grade to the 10% of the students who earn...

    Started by ang6705‎, 09-28-2010 09:52 AM
    • Replies: 4
    • Views: 2,758
    09-28-2010, 11:36 AM Go to last post
  49. Normal Distribution

    The time for symptoms of fire blight to develop in apple seedlings maintained at a temperature of 25C is normally distributed with a mean of 7 days...

    Started by ang6705‎, 09-28-2010 09:48 PM
    • Replies: 1
    • Views: 3,060
    09-28-2010, 11:36 PM Go to last post
  50. Conditional probability calculation

    Please can someone help me with the following question: An urn contains 3 white, 6 red and 5 black balls. Six of these balls are randomly selected...

    Started by Angela_o‎, 07-29-2011 02:55 AM
    • Replies: 1
    • Views: 7,386
    08-08-2011, 11:16 AM Go to last post
  51. Need Help with Practice Exam Question ASAP

    Hi. I have an exam coming up and I have no clue on how to do this problem on the practice exam. Can someone help me as soon as you can? Thanks. ...

    Started by angelica‎, 08-06-2007 08:03 AM
    • Replies: 0
    • Views: 2,412
    08-06-2007, 08:03 AM Go to last post
  52. Question Joint distribution from multiple marginals

    Consider an experiment consisting of a repeated trial with two random Bernoulli (=binary) variables, A and B. Each trial consists of multiple...

    Started by Angelorf‎, 05-20-2013 12:22 PM
    estimation, joint distribution, marginals, repeated tests
    • Replies: 4
    • Views: 1,707
    06-19-2013, 06:21 AM Go to last post
  53. really hard prob ques==need major help !!!

    Hi guys i really need help on this question, it's so confusing, all help will be greatly appreciated ! =) so here's the question: as part of a...

    Started by angel_eyez88‎, 06-09-2008 12:26 AM
    • Replies: 3
    • Views: 3,167
    06-09-2008, 09:18 PM Go to last post
  54. Need help with probability questions

    Democrat Republican Independent Total Male 346 125 24 495 Female 404 ...

    Started by Angel_lis‎, 03-06-2010 11:45 AM
    • Replies: 2
    • Views: 2,757
    03-06-2010, 02:44 PM Go to last post
  55. How to draw tree diagram

    I have the following problem from my home problem. An oil-prospecting firm hits oil or gas on 10% of its drillings. If the firm drills two wells,...

    Started by Angel_lis‎, 03-07-2010 02:39 PM
    • Replies: 1
    • Views: 6,477
    03-07-2010, 05:53 PM Go to last post
  56. birthday coincidence

    Hi, I'm wondering if anyone can help with something that's been puzzling my family for years. I have 3 sons, 2 from my first marriage and one from...

    Started by AngieT‎, 08-15-2011 10:34 AM
    • Replies: 10
    • Views: 2,718
    08-17-2011, 02:24 PM Go to last post
  57. how do design an experiment given a previous one

    hello my question is : i have preformed an experiment on an electronic device. the experiment was running the device 110000 cycles in which i...

    Started by anir10‎, 07-27-2012 09:37 AM
    • Replies: 0
    • Views: 2,260
    07-27-2012, 09:37 AM Go to last post
  58. 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: 4,115
    04-08-2012, 04:59 PM Go to last post
  59. PDF & CDF Integration! Please help!!

    Hi everyone, I haven't done integration in a long time, so I just need someone to verify if my calculation is right. The question is: ...

    Started by ankitj‎, 08-10-2009 06:52 AM
    • Replies: 2
    • Views: 4,514
    08-10-2009, 09:31 AM Go to last post
  60. PDF & Cost

    Hi everyone, I just need my answer verified. Suppose that the number of word processors x that are purchased each year has the following...

    Started by ankitj‎, 08-10-2009 12:38 PM
    • Replies: 2
    • Views: 3,053
    08-17-2009, 10:18 AM Go to last post

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