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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: 30,285
    09-30-2005, 09:44 AM Go to last post
  1. Time Series Analysis

    Hello All. I am a new member to this forum. I wish to understand a couple of papers ...

    Started by StatsOntheSide‎, 10-05-2011 08:00 PM
    • Replies: 7
    • Views: 7,182
    04-18-2017, 03:10 PM Go to last post
  2. Same flat tire

    Hello, I am unsure about how to solve this one: It's Friday afternoon and six fraternity brothers at UNC have just attended their last class of the...

    Started by dina786‎, 10-01-2012 06:08 PM
    • Replies: 7
    • Views: 4,592
    02-26-2014, 12:24 AM Go to last post
  3. How to find P(x1<x2)

    X2 and x1 being 2 independent exponential variables with mean 5 and 2. I found f(x1) and f(x2) and defined y as x2 - x1 but I'm stuck there. How do...

    Started by statgoon13‎, 11-16-2013 06:42 PM
    • Replies: 7
    • Views: 3,567
    11-17-2013, 06:48 PM Go to last post
  4. comparison with normal distribution truncated

    Hello, I would to know how to calculate the probability that X > Y when Y is greater than a given value p (X and Y are random variable following...

    Started by pascal34‎, 06-03-2014 10:49 AM
    gaussian distribution
    • Replies: 7
    • Views: 1,843
    06-04-2014, 06:53 AM Go to last post
  5. Negative binomial distribution

    Hello, I am a student at the university of Hasselt (Belgium) in management, and I had to follow a statistical course. It is for me very difficult...

    Started by bibifers‎, 06-02-2014 12:44 PM
    • Replies: 7
    • Views: 2,124
    06-02-2014, 05:16 PM Go to last post
  6. Building confidence intervals using Coefficient of variation

    Hi I have a doubt and i need to understand it. At my work, my colleagues use the coefficient of variation for doing confidence intervals. Not...

    Started by jfca283‎, 08-05-2014 10:59 AM
    • Replies: 7
    • Views: 1,962
    08-05-2014, 12:51 PM Go to last post
  7. Process Control

    Hi, Could anyone help me with a statistical process control problem i have? I am measuring a process which gives a measured value range from 0...

    Started by PresterJohn‎, 09-30-2014 09:28 AM
    • Replies: 7
    • Views: 2,496
    10-01-2014, 09:34 AM Go to last post
  8. Problem:Finding n-stickers

    Hello, we ( students ) were given a very randomly homework. I say randomly because we've been solving PROBABILITY tasks and now suddenly we were...

    Started by imartinmkd‎, 11-09-2014 09:32 PM
    • Replies: 7
    • Views: 2,024
    11-10-2014, 01:08 PM Go to last post
  9. Conditional Variance

    Hi, I have difficulty understanding the definition of conditional variance as: var(X|Y) = E)**2 | Y]. Given the definition of variance of a...

    Started by fifosm‎, 11-09-2014 04:25 PM
    conditional variance
    • Replies: 7
    • Views: 1,882
    12-01-2014, 10:12 AM Go to last post
  10. A couple Normal Distribution Probability problems

    I've been trying to figure out the answer to these two problems for weeks, but I can't seem to figure out how to do them. Please let me know if you...

    Started by meaght12‎, 12-11-2014 02:19 PM
    • Replies: 7
    • Views: 2,157
    12-11-2014, 04:58 PM Go to last post
  11. Poll Poll: A probability problem

    Hi all, I would like to solve the problem bellow. To some it might seem to eassy. However i would appreciate some hints. Thanks in advance ... ...

    Started by marius15‎, 04-26-2015 08:49 AM
    • Replies: 7
    • Views: 2,731
    04-26-2015, 04:51 PM Go to last post
  12. Bayesian Convergence

    I have to go to bed any minute, so I apologize for the lack of detail provided. I was thinking about repeated testing and how probabilities...

    Started by hlsmith‎, 05-10-2015 10:04 PM
    • Replies: 7
    • Views: 1,778
    05-13-2015, 03:26 AM Go to last post
  13. How to calculate how often a specific combination occurs in random design?

    Hi everybody, I hope someone can help me out! We designed an experiment in which 24 short clips are shown to particpants. These clips belong to...

    Started by Funmath‎, 09-11-2015 09:15 AM
    • Replies: 7
    • Views: 2,629
    09-11-2015, 10:56 AM Go to last post
  14. Probability function based on X ~ Exp(B)

    I have a problem which im having difficulties to solve. We have a continuous variable X = time measured in hours until event A happens. X is...

    Started by lukketotte‎, 09-23-2015 01:20 PM
    • Replies: 7
    • Views: 1,689
    09-25-2015, 05:52 AM Go to last post
  15. Calculating the Probability of a Subset

    I'm a newbie and not a stats savvy so help and guidance is appreciated. If I use incorrect terms please forgive and correct. The data set...

    Started by dofdear‎, 09-25-2015 12:55 PM
    probability
    • Replies: 7
    • Views: 1,860
    09-27-2015, 01:38 AM Go to last post
  16. Probability Of insurance sales

    Just a disclaimer I know I am omitting important factors such as competition, earned premium etc etc. I'm just using this exercise so I can start...

    Started by semidevil‎, 04-21-2016 12:38 PM
    • Replies: 7
    • Views: 1,770
    04-26-2016, 02:50 PM Go to last post
  17. Post a low correlation and a strong significance = can the null hypothesis be rejected?

    I have found that there is a very low negative correlation (r= - 0.17) with strong significance (p<0.0001) between A test and B test. The null...

    Started by emma13‎, 04-21-2016 10:42 AM
    pseudo-replication
    • Replies: 7
    • Views: 1,434
    04-22-2016, 09:07 AM Go to last post
  18. Easy Coin Flip Problem ???

    Hi, I need help. Assume the probability of flipping a coin to heads 20 times in a row is 1:1,000,000 Q: Each day you wake up and flip a coin...

    Started by fergferg‎, 05-15-2016 05:43 PM
    • Replies: 7
    • Views: 1,938
    05-18-2016, 01:54 PM Go to last post
  19. Definition of random variable with respect to event space

    It is given that: We toss two dice with sample space Ω = {(i, j), 1 ≤ i, j ≤ 6} and the σ-algebra is generated by the events Ak = {(i,j) :...

    Started by endlessend25‎, 10-17-2016 03:19 PM
    probability, self-study, sigma-algebra
    • Replies: 7
    • Views: 3,488
    10-18-2016, 07:26 AM Go to last post
  20. Question Solving a LogNormal Conditional expectation equation - Insurance

    Hi everyone, I am a newbie here and apologize if this post is in the wrong forum. I need help to solve the following LogNormal Conditional...

    Started by OLSMAG‎, 12-16-2016 06:33 AM
    conditional expectation, insurance, lognormal
    • Replies: 7
    • Views: 3,265
    12-16-2016, 11:02 AM Go to last post
  21. Roulette - expected value

    Hello, I want to calculate the expected pay-out of european roulette spins. Particularly, I want to know what is the expected pay-out at the...

    Started by federico.zampini‎, 02-09-2017 11:08 AM
    probab
    • Replies: 7
    • Views: 2,565
    03-02-2017, 04:06 AM Go to last post
  22. Smile help!?!

    Suppose you are the admissions officer at a university. Your university has room for a first year class of 5,000. When you admit students, you know...

    Started by statsdud‎, 11-02-2005 03:05 PM
    • Replies: 6
    • Views: 3,032
    11-04-2005, 12:05 AM Go to last post
  23. Guidance please

    Need guidance. 2 machines, each produce half of the total garments Probability that an irregular garment will come from machine 1 is 0.05...

    Started by MissNJ‎, 02-04-2006 08:55 PM
    • Replies: 6
    • Views: 3,635
    02-04-2006, 10:05 PM Go to last post
  24. probability

    Can anybody help me to solve this problem ?please :( 1-In a certain community, 50% of the people have disease A, 15% have disease B and 5% have...

    Started by meme‎, 03-18-2006 07:42 AM
    • Replies: 6
    • Views: 4,254
    04-03-2006, 11:06 AM Go to last post
  25. Probability help

    In a meat packaging plant, Machine A accounts for 60% of the plantís output while Machine B accounts for 40% of the plantís output. 1% of the...

    Started by Taka‎, 04-01-2006 05:38 AM
    • Replies: 6
    • Views: 3,244
    04-05-2006, 09:55 AM Go to last post
  26. help me

    can any bady help me to solve this problem :confused: Problem 1: An airline finds that 4 percent of the passengers that make reservations on a...

    Started by meme‎, 04-04-2006 03:35 PM
    • Replies: 6
    • Views: 2,723
    12-04-2006, 04:11 PM Go to last post
  27. im just stuck. pls help me

    You wish to open a new restaurant and are considering locations in Edmonton and St. Albert, but only one location will actually become ...

    Started by sweetx‎, 08-29-2006 10:34 PM
    • Replies: 6
    • Views: 5,348
    09-01-2006, 12:46 AM Go to last post
  28. Stuck on a problem that should be easy

    So this is one of the first problems in our chapter on probability. I'm assuming I am supposed to intuit how to do this, because there are no other...

    Started by Turbowaffle‎, 09-19-2006 01:14 PM
    • Replies: 6
    • Views: 5,073
    09-19-2006, 02:57 PM Go to last post
  29. Another Bayes Problem

    Hello, thanks for taking the time to look at my question. I'm a first year student at a university in VA and I'm taking an entry level statistics...

    Started by WillNjmu‎, 09-23-2006 10:13 PM
    • Replies: 6
    • Views: 3,475
    09-25-2006, 08:45 AM Go to last post
  30. Pls tell me if my answer is correct / level of sig

    My question is: A diet and exercise program was designed to reduce absenteeism of employees at a large company. A study of 10 employees...

    Started by sweetx‎, 12-14-2006 02:00 PM
    • Replies: 6
    • Views: 3,141
    12-21-2006, 09:36 AM Go to last post
  31. Homework Help

    I am not sure where to begin or what to do with the below question. Any help would be ace. Cheers. Suppose that fifty people are to be given a...

    Started by statsdud‎, 04-27-2008 07:28 AM
    • Replies: 6
    • Views: 5,447
    05-01-2008, 10:48 PM Go to last post
  32. Question probability proof help

    Hi, I need to prove the following argument , can anyone help? Let A={a1,a2,...am} and B={b1,b2,...bn} are 2 group of random variables. ...

    Started by wu7up‎, 05-07-2008 11:54 AM
    • Replies: 6
    • Views: 2,597
    05-10-2008, 08:27 AM Go to last post
  33. Probability Question

    I'm having trouble figuring this out. 3 digits are chosen in order from 0, 1, 2 ... 9. What is the probability that first < second < third a)...

    Started by nathan183‎, 05-29-2008 09:25 PM
    • Replies: 6
    • Views: 2,997
    05-30-2008, 11:30 AM Go to last post
  34. Probability Question

    I need help solving this question: P(X^2 > Y) = 0.025 where X^2~X^2(21)

    Started by skyraptor‎, 06-03-2008 07:38 PM
    • Replies: 6
    • Views: 4,162
    06-04-2008, 01:26 PM Go to last post
  35. Uniform distribution

    First of all i'm sorry for my english:shakehead ! I'm an Italian logistic engineering student, I've some trouble trying to solve this kind of...

    Started by thessdd‎, 06-20-2008 05:19 AM
    • Replies: 6
    • Views: 6,236
    06-23-2008, 08:24 AM Go to last post
  36. Probability - Multiplication/addition rules?

    I have been working on this problem and have come up with answers, but I have a feeling they are wrong...Hoping people much more intelligent in...

    Started by DryMouse‎, 07-01-2008 12:44 AM
    • Replies: 6
    • Views: 4,727
    07-01-2008, 11:16 PM Go to last post
  37. Need help in finding the probability of events occuring?

    Question: i have a total of 16 events whereby the probability of 2 events occuring is 0.3, the probability of 6 events occuring is 0.003 and the...

    Started by spidermman‎, 07-19-2008 04:10 AM
    • Replies: 6
    • Views: 5,520
    07-20-2008, 01:38 AM Go to last post
  38. Poisson/Binomial distribution help

    Hi everyone I'm enrolled in a first year intro stats paper at uni and am having difficulty solving questions on proportions using binomial or...

    Started by Silvanus‎, 08-05-2008 06:03 PM
    • Replies: 6
    • Views: 3,633
    08-06-2008, 04:59 PM Go to last post
  39. probability concepts

    Hi, In Devore and Farnum (Applied Statistics and Scientists and Engineers), it gives this question on p. 210: "Suppose that there is a...

    Started by Silvanus‎, 08-13-2008 12:09 AM
    • Replies: 6
    • Views: 3,523
    08-13-2008, 07:16 PM Go to last post
  40. Dice roll

    Sorry if this topic has been discussed before. I hate looking through forums randomly for an answer to a question. So, maybe one of you could help...

    Started by lookoverhear‎, 08-29-2008 07:18 PM
    • Replies: 6
    • Views: 2,618
    08-29-2008, 10:21 PM Go to last post
  41. Some Questions

    i) find a formula for the number of sequences of 0's and 1's of lenght n such that the sum of the 0's and 1's in the sequence is k ii) prove that...

    Started by jamesmartinn‎, 09-11-2008 04:55 PM
    • Replies: 6
    • Views: 2,476
    09-15-2008, 09:23 AM Go to last post
  42. Independent Events Occurring Simultaniously

    This should be an easy one for you smart guys: Consider a double computer intruder detection system (IDS) with system A and system B. If there is...

    Started by KitsuMathTard‎, 10-08-2008 09:18 PM
    • Replies: 6
    • Views: 9,009
    10-10-2008, 07:48 AM Go to last post
  43. Very easy question for you...help

    Assume that the rate of return on projects is a random variable having a normal distribution with standard deviation = 0.05 per cent. If a bank...

    Started by blackjesus13‎, 10-19-2008 03:29 AM
    • Replies: 6
    • Views: 2,856
    10-20-2008, 11:10 AM Go to last post
  44. 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: 4,879
    10-21-2008, 10:19 PM Go to last post
  45. transformation of distributions

    Here is a question: Consider a uniform variable U on (0,1) and define the variable X=e^u. Find the distribution of X. Here is the work I've...

    Started by anna_s‎, 10-26-2008 08:44 AM
    • Replies: 6
    • Views: 2,260
    10-26-2008, 01:41 PM Go to last post
  46. independent and disjoint

    If C and D be independent events which are disjoint. What can we said about their probabilities?? i know C, D are independent so P(C n D)=P(C)...

    Started by xixihaha‎, 11-28-2008 03:33 PM
    • Replies: 6
    • Views: 10,039
    11-29-2008, 02:10 PM Go to last post
  47. Joint distribution, find P(X^2 + Y^2 <=1)

    I am trying to teach myself (without a tutor) some degree level Statistics. I think I've answered parts a-c of this question, but would like...

    Started by NicolaR‎, 01-16-2009 03:49 PM
    • Replies: 6
    • Views: 22,584
    01-17-2009, 02:42 PM Go to last post
  48. Will someone please help a lost Engineer?

    I am trying to finish my thesis for my Masters in Civil Engineering and have run into a statistics/ probability question which my one Engineering...

    Started by Civil Eng.‎, 02-05-2009 12:20 AM
    • Replies: 6
    • Views: 2,765
    02-05-2009, 06:45 PM Go to last post
  49. Confirmation: Urgent!

    Hey all, I just wrote my final exam and there were a set of questions I'm not sure I answered correctly: A deck of 52 cards is shuffled, then we...

    Started by jamesmartinn‎, 02-28-2009 07:43 PM
    • Replies: 6
    • Views: 3,017
    02-28-2009, 11:02 PM Go to last post
  50. Student Enrollment Probability

    Hey everyone, back again with another problem giving me problems. A local university reports that 3% of their students take their general...

    Started by hackman2007‎, 02-23-2009 06:30 PM
    • Replies: 6
    • Views: 8,289
    02-27-2009, 07:44 PM Go to last post
  51. Probability of faulty part

    Hi, The question that i am currently working on is; A company uses three machines (A,B and C) to produce electronic components. Machine A...

    Started by gisler‎, 02-24-2009 06:23 AM
    • Replies: 6
    • Views: 4,323
    03-02-2009, 09:41 AM Go to last post
  52. Joint Probability Distribution

    Hello all! Having a bit of problems here with making the table for a joint distribution: Question: 3 Fair coins are tossed. Let X = #of heads in...

    Started by jamesmartinn‎, 02-27-2009 05:49 PM
    • Replies: 6
    • Views: 10,307
    02-27-2009, 07:51 PM Go to last post
  53. picking 50 yellow marbles

    If there's a jar with 663 yellow marbles out of 849 total marbles, what is probability that i will extract 50 yellow marbles in 50 tries?

    Started by medc‎, 03-09-2009 10:32 AM
    • Replies: 6
    • Views: 3,320
    03-10-2009, 11:02 AM Go to last post
  54. mutually exclusive events

    Hi guys, please help. I have to check whether the following events are mutually exclusive: (a) P(X) = 0.2, P(Y) = 0.3, P(Z) =...

    Started by SylviaS‎, 03-20-2009 03:33 PM
    • Replies: 6
    • Views: 2,884
    03-21-2009, 04:46 PM Go to last post
  55. Not sure if I did this right! Please help!

    An oil drilling company ventures into various locations, and their success or failure is independent from one location to another. Suppose that the...

    Started by ankitj‎, 08-11-2009 12:19 PM
    • Replies: 6
    • Views: 4,093
    08-12-2009, 07:44 AM Go to last post
  56. Cool normal distribution help

    Hi everyone, The question is: The time at which the pizza gets delivered follows a normal distribution with a mean of 3:00PM and a standard...

    Started by canon14‎, 08-24-2009 07:15 PM
    • Replies: 6
    • Views: 2,111
    08-25-2009, 06:42 AM Go to last post
  57. binomial probability question

    The probability of having a boy = .51 and the probability of having a girl = .49. Find the largest number, "x," that will make this statement...

    Started by kimdoocheol‎, 10-14-2009 01:34 AM
    • Replies: 6
    • Views: 3,582
    10-14-2009, 10:18 PM Go to last post
  58. Almost sure convergence & convergence in probability

    "Almost sure convergence" always implies "convergence in probability", but the converse is NOT true. Thus, there exists a sequence of random...

    Started by kingwinner‎, 11-23-2009 08:37 PM
    • Replies: 6
    • Views: 9,667
    11-26-2009, 10:23 AM Go to last post
  59. Smile Restaurant Grand Opening probability question

    Hi, i was wondering if anyone could help me figure out something. Here is the situation: There is a chain restaurant that has grand openings in new...

    Started by johnmichael‎, 01-10-2010 11:40 AM
    • Replies: 6
    • Views: 3,203
    01-15-2010, 01:42 PM Go to last post
  60. Normal R.V. (z) multiplied by a function of z

    it is found in one of the papers I've read recently and written: z ~ N(m,v) and f(z) is just any function of z then E(exp(z)*f(z)) =...

    Started by loooooo‎, 01-29-2010 08:39 AM
    • Replies: 6
    • Views: 3,340
    02-01-2010, 06:09 AM Go to last post

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