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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: 30,188
    09-30-2005, 09:44 AM Go to last post
  1. introduction to stochastic process by by Hoel, Port and Stone.

    those any one have this text. i have gone through all the questions in chapter 1 except for two prove questions. no 27 and 26 i am lost

    Started by colltie‎, 01-26-2009 11:40 AM
    • Replies: 6
    • Views: 13,071
    07-16-2010, 02:05 PM Go to last post
  2. Probability, binominal distribution

    A hotel manager knows that approximately 5 % of the reservations are so called “no-shows” – people who have made a reservation, but do not arrive...

    Started by JackSwan‎, 02-02-2010 12:15 PM
    • Replies: 6
    • Views: 7,993
    02-03-2010, 03:22 AM Go to last post
  3. Question about probability - roulette wheel

    Hi there, Have a question about the topic above. I spin a roulette wheel and wait until 31 of the 37 numbers have come up. I then cover the...

    Started by dhanwell‎, 02-09-2010 10:49 AM
    • Replies: 6
    • Views: 5,185
    02-09-2010, 01:23 PM Go to last post
  4. convergence short question

    Hi there, The "n" below is a subscript If Xn is a sequence of random variables and Xn converges to zero almost surely. Can we say something...

    Started by leo nidas‎, 03-30-2010 04:47 AM
    • Replies: 6
    • Views: 3,688
    04-15-2010, 08:19 AM Go to last post
  5. Equation for the Standard Normal Curve

    Does anybody know what the equation is for the standard normal curve? In my statistics class, we use a chart to find areas under the curve given...

    Started by dogginboggin‎, 04-15-2010 08:40 PM
    • Replies: 6
    • Views: 17,417
    04-16-2010, 04:52 PM Go to last post
  6. Logistic Distribution Question

    I have two independent random variables each with a logistic distribution (not necessarily same mean and variance). How is the difference (or sum)...

    Started by koochak‎, 04-23-2010 06:18 AM
    • Replies: 6
    • Views: 8,176
    04-27-2010, 07:22 AM Go to last post
  7. Industry-Wide safety factor of 4

    I want to hang a 10# picture on the wall so I carefully and slowly load the hanger with 40#. It doesn't fall. What can I say at this point about...

    Started by Outlier‎, 05-07-2010 02:54 PM
    • Replies: 6
    • Views: 5,230
    05-08-2010, 10:20 AM Go to last post
  8. Checking over answers

    hey could you guys tell me if i got these correct because there are some I'm unsure on the method thanks :wave: X-Exp(0.3) then find P(X>15|X>10)...

    Started by pure_zero‎, 05-11-2010 07:48 PM
    • Replies: 6
    • Views: 3,571
    05-13-2010, 04:15 AM Go to last post
  9. Is this a standard distribution?

    Hello, Please pardon my LaTeX, but does anyone recognize this probability distribution? \frac{ (1-w)^{n_1} w^{n_2} }{ ...

    Started by Dan the Chemist‎, 05-20-2010 03:05 PM
    • Replies: 6
    • Views: 2,540
    05-22-2010, 04:26 AM Go to last post
  10. Binomial Distribution as N goes to Infinity

    I know that the Central Limit Theorem says that all types of distributions go to normal distribution as N goes to infinity. However, is there some...

    Started by messianic‎, 07-15-2010 04:38 PM
    • Replies: 6
    • Views: 9,113
    07-15-2010, 07:36 PM Go to last post
  11. Easy Probability Question

    Hi ppl, Im trying to solve to following simple problem but I'm finding it harder than expected. This problem has to be eventually be generalized...

    Started by davmt‎, 07-26-2010 07:08 PM
    • Replies: 6
    • Views: 2,864
    08-09-2010, 08:46 PM Go to last post
  12. prob.

    how many different 10-letter words (real or imaginary) can be formed from the letters in the word MONOCHROME? okay, so I did this by doing...

    Started by yohy20‎, 07-27-2010 10:00 PM
    • Replies: 6
    • Views: 2,753
    07-27-2010, 11:02 PM Go to last post
  13. Question Likert Scale Data

    To all you statistics geniuses, I have some Likert scale data that I need to analyze. From research, I understand the controversy of using methods...

    Started by Gemini‎, 07-28-2010 03:07 PM
    • Replies: 6
    • Views: 9,964
    08-04-2010, 09:59 AM Go to last post
  14. question about likelihood function/MLE

    If a random variable Y has the following probability distribution: P (Y = 1) = p, P (Y = 2) = q, and P (Y = 3) = 1−p−q. A random sample of size n...

    Started by messianic‎, 08-04-2010 09:05 PM
    • Replies: 6
    • Views: 4,508
    08-06-2010, 10:25 AM Go to last post
  15. null hypothesis questions

    A manufacturer of computer memory chips produces chips in lots of 1000. If nothing has gone wrong in the manufacturing process, at most 7 chips each...

    Started by steve456‎, 08-07-2010 05:37 PM
    • Replies: 6
    • Views: 6,377
    08-08-2010, 04:44 PM Go to last post
  16. Lickert scale mean median mode?

    How do we find a 5 point lickert scale data`s mean median mode? is it possibl? I am not familiar with lickert scale data analysis, and yet I have to...

    Started by SadieKhan‎, 08-12-2010 04:52 PM
    • Replies: 6
    • Views: 10,996
    08-13-2010, 03:36 AM Go to last post
  17. Poisson process, payment, standard deviation

    We have an insurance company that pays out claims at times of a Poisson process, with rate 4 per week. Suppose that the mean payment is 10K dollar...

    Started by Ego7894612‎, 08-31-2010 08:59 AM
    • Replies: 6
    • Views: 7,339
    09-01-2010, 09:06 PM Go to last post
  18. Is it a tricky question?

    When many small businesses were surveyed, 82.2% said they employed women in some capacity. Of the businesses that employed women, 17.5% employed no...

    Started by SadieKhan‎, 09-03-2010 02:08 PM
    • Replies: 6
    • Views: 3,409
    09-04-2010, 01:55 AM Go to last post
  19. Anderson-Darling test appropriate?

    Hi, I have a large (>2500) number of z-scores and I want to test if the distribution of these deviates from a unit normal distribution. I have...

    Started by rhayman‎, 09-14-2010 03:17 AM
    • Replies: 6
    • Views: 11,819
    10-17-2010, 10:04 PM Go to last post
  20. Poker Card Probability Question

    Good evening everyone, I have the following question: Jane plays a game where she randomly draws a card from a pile of 3 poker cards initially...

    Started by mysterdusk‎, 09-28-2010 05:54 AM
    • Replies: 6
    • Views: 3,179
    09-30-2010, 10:01 AM Go to last post
  21. Is it Binomial?

    I am really stuck with this question, I am trying to figure out which distribution it is , can someone give me a hint plz?:( 2. A physician is...

    Started by SadieKhan‎, 10-12-2010 11:44 AM
    • Replies: 6
    • Views: 2,940
    10-12-2010, 06:53 PM Go to last post
  22. Lottery

    15. A group is selling 1000 raffle tickets. The winning ticket gets $50,000. a. If tickets are given away for free, what is the Expected Value...

    Started by SadieKhan‎, 10-22-2010 03:40 PM
    • Replies: 6
    • Views: 3,484
    10-23-2010, 07:19 AM Go to last post
  23. Probability of 4 of n shots hitting.

    Hello. First timer here, hopefully you guys can help me! First of all, let me say that this is not a homework problem of any sort, it's for a...

    Started by BAUSTIN‎, 10-26-2010 09:04 AM
    • Replies: 6
    • Views: 3,729
    10-26-2010, 01:18 PM Go to last post
  24. Interesting Bean Problem

    Good evening, I've encountered an interesting problem and need a little help with it (: Question 1A) A bean is placed in a bag. The bean is...

    Started by mysterdusk‎, 10-27-2010 07:26 AM
    • Replies: 6
    • Views: 5,419
    10-29-2010, 11:38 PM Go to last post
  25. Poll Poll: Basic Probability 2

    Four Coins are tossed together. What is probability that HEAD will appear on at least on of the four coins?

    Started by sukumartenth‎, 10-29-2010 10:12 AM
    • Replies: 6
    • Views: 3,148
    11-01-2010, 03:28 AM Go to last post
  26. Distribution of the Sum of r.v.

    Guys, I will appreciate if you can give me some hints on this problem: Let X1,X2,...Xn be i.i.d with mass function f(k)= / for k>1. Find the...

    Started by Bardn‎, 10-31-2010 01:01 AM
    • Replies: 6
    • Views: 2,749
    10-31-2010, 12:00 PM Go to last post
  27. Poll Poll: Basic Probability 3

    Please help me with this question Two cards are drawn at random from a pack of cards. Find the probability that both cards are of Red Colour or...

    Started by sukumartenth‎, 11-01-2010 03:40 AM
    • Replies: 6
    • Views: 3,837
    11-01-2010, 12:06 PM Go to last post
  28. Exclamation help with expected value

    1. Let X,Y and Z be 3 random variables, and X and Z are independent. Prove that Cov(X+Y,Z)=Cov(Y,Z). For this i expanded into E(Z(X+Y)) -...

    Started by omega‎, 11-06-2010 08:43 PM
    • Replies: 6
    • Views: 4,696
    11-07-2010, 01:09 PM Go to last post
  29. pls help me ok^^?

    hi all, who can give me hint to finish the question below? many thanks^^:yup: ----------------------------------------------------------------- A...

    Started by ho168‎, 11-08-2010 12:46 PM
    • Replies: 6
    • Views: 2,985
    11-09-2010, 10:50 AM Go to last post
  30. simple proof of expected value...

    CV are random variables. Whats a hint to show if C<=V, then E(C)<=E(V)? my bad attempt if C<=V then P(C=s)<=p(V=s) for all s so summation of...

    Started by omega‎, 11-08-2010 06:17 PM
    • Replies: 6
    • Views: 5,193
    11-09-2010, 03:47 PM Go to last post
  31. Help PLz.

    I'm doing my college statistics homework and i have a number of problems that i cant seem to figure out at all.. i was hoping to get someones help by...

    Started by xReTry‎, 11-08-2010 06:35 PM
    • Replies: 6
    • Views: 2,810
    11-09-2010, 12:24 PM Go to last post
  32. Conditional Expectation question

    My final is on Mon, and I got this HW problem wrong from last week, and I still don't understand why. An item is selected randomly from a...

    Started by StatStudent3‎, 12-09-2010 10:23 PM
    • Replies: 6
    • Views: 6,286
    12-21-2010, 07:11 AM Go to last post
  33. How to calculate probability on dice groups.

    I'm a game designer studying the probability curves of various dice throwing mechanics. I know some basic statistics but it's been a while since I...

    Started by marcsterix‎, 12-22-2010 10:24 PM
    • Replies: 6
    • Views: 8,453
    12-23-2010, 02:39 PM Go to last post
  34. Multivariate conditional probability

    Hello all, I'm having a difficult time finding an equation that will give me the conditional probability of a specific scenario occurring. To...

    Started by oreo0313‎, 01-03-2011 10:18 PM
    • Replies: 6
    • Views: 5,545
    01-04-2011, 11:16 AM Go to last post
  35. Matching sets on Dice

    For those of you who know dice, I have this question: You roll multiple dice (with the same number of sides), what are the chances of getting...

    Started by ArmoredThirteen‎, 01-08-2011 05:43 PM
    dice
    • Replies: 6
    • Views: 5,051
    01-25-2011, 01:05 AM Go to last post
  36. MLE question

    Q. The proportion of metal in an ore sample has the pdf: f(u) = c.u^(c-1) 0≤u≤1 (a) The parameter c>0 is a measure of the quality...

    Started by languagelearner23‎, 03-06-2011 01:37 PM
    • Replies: 6
    • Views: 2,365
    03-07-2011, 09:08 AM Go to last post
  37. Binomial/geometric distributions

    Which of the following are true statements? I. The histogram of a binomial distribution with p=0.5 is always symmetric II. The histogram of a...

    Started by fireman144‎, 03-06-2011 10:54 PM
    • Replies: 6
    • Views: 5,611
    03-07-2011, 03:21 AM Go to last post
  38. Help Whith this problem.. probability

    Hey my name is george... im Colombian... anyway if you guys can help me with this one i will try to translate this the better i can A box of 50...

    Started by GeorgeVergel‎, 03-11-2011 01:34 PM
    • Replies: 6
    • Views: 2,534
    03-11-2011, 04:54 PM Go to last post
  39. Finding data value corresponding to a probability

    My apologies if this is in the wrong section first of all, probability seemed appropriate. Starting off with the question I'm trying to come up...

    Started by goles‎, 03-20-2011 04:43 PM
    • Replies: 6
    • Views: 8,349
    03-20-2011, 06:47 PM Go to last post
  40. Expected Profit

    This question is really confusing me: The annual profit Y(in $100,000) can be expressed as a continuous function of drug demand x(in 1,000): Y(x)...

    Started by stat_student001‎, 03-21-2011 03:30 PM
    • Replies: 6
    • Views: 12,206
    03-21-2011, 10:53 PM Go to last post
  41. Poisson and Geometric Random Variable questions

    Hi all, Can anyone tell me if I got the correct answers for the below two questions? Any help is appreciated. Q:Let X have a Poisson...

    Started by dizzle1518‎, 04-26-2011 08:11 PM
    • Replies: 6
    • Views: 5,388
    04-28-2011, 10:29 PM Go to last post
  42. Need help with probabilities for work

    All, I am in desperate need of some help that isn't school related. I have some issues at work that need to be addressed and they deal with...

    Started by chadboehne‎, 05-24-2011 10:58 AM
    • Replies: 6
    • Views: 2,126
    05-24-2011, 03:40 PM Go to last post
  43. sigma algebra and expectation

    Are the following true or false ? Explain your answers. (If it is false, giving a counter example will do.) 1) If \displaystyle A_j \in ...

    Started by madara123‎, 06-18-2011 05:44 AM
    • Replies: 6
    • Views: 4,446
    06-18-2011, 02:25 PM Go to last post
  44. need help.. really bad..

    1) Discrete random variable X is distributed whit definition: α is alfa P( X = k ) = α / 2^k k { 0, 1, 2, 3, 4 } ----------------------- a)...

    Started by nered‎, 06-24-2011 02:29 PM
    • Replies: 6
    • Views: 2,517
    06-24-2011, 04:13 PM Go to last post
  45. help on to find probability density function

    hey guys, i am really confused on something.here is the thing: i have; i=x+(x^2-y)^(1/2) and here x is uniform...

    Started by Musa DemirtaĹź‎, 06-29-2011 07:58 PM
    • Replies: 6
    • Views: 3,136
    07-03-2011, 10:56 AM Go to last post
  46. 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: 5,734
    08-14-2011, 07:40 AM Go to last post
  47. brownian motion in stopping time

    Hello everyone! I am stuck with a little problem concerning BM and stopping time. :( If we define tau_n:=inf{t>=0 : |W_t|>=n}, does anyone have...

    Started by Marina‎, 07-13-2011 07:08 AM
    • Replies: 6
    • Views: 3,701
    07-15-2011, 12:41 PM Go to last post
  48. expected gain

    Let's say the price people are willing to pay for something is listed below, so 9 people are willing to pay 3 while only 1 is willing to pay 12. How...

    Started by Outlier‎, 07-16-2011 03:03 PM
    • Replies: 6
    • Views: 4,225
    07-17-2011, 11:28 AM Go to last post
  49. Learning Probability Math

    I’m reading a couple of works on probability, including “Probability Theory: The Logic of Science” by Jaynes. All of the math is over my head, and I...

    Started by StevenCraigMiller‎, 08-04-2011 08:31 PM
    • Replies: 6
    • Views: 2,778
    08-05-2011, 01:09 PM Go to last post
  50. Basic (or maybe not so) probability problem/experiment/question.

    I came upon an interesting probabilistic assertion in a book I'm reading. Here's the quote: "Once in a while we find co-occurrences, and we're...

    Started by bfotk‎, 09-05-2011 05:23 PM
    probability question
    • Replies: 6
    • Views: 2,724
    09-06-2011, 03:20 AM Go to last post
  51. HW: Exponential random variable

    Hi, I've been a asked question that I am unable to deal with. For part (a), how do I find b? How do I approach this question as a whole?...

    Started by Peytonator‎, 10-03-2011 07:35 AM
    • Replies: 6
    • Views: 2,368
    10-04-2011, 11:08 AM Go to last post
  52. Factorials

    How would I solve this problem? If I roll a fair die 4 times. X is the number of times 1 or 2 are observed in 4 rolls. What is the minimum number...

    Started by Caggy9702‎, 10-23-2011 07:06 PM
    math, probability, statistics
    • Replies: 6
    • Views: 2,004
    10-23-2011, 08:33 PM Go to last post
  53. Confusion with distributions..

    I have the following question and I have no idea how to solve it. 3) The population variance of the distribution for X is 100. Two random samples...

    Started by mmmmxx‎, 11-08-2011 12:37 PM
    • Replies: 6
    • Views: 3,286
    11-09-2011, 02:38 AM Go to last post
  54. Trivial question

    Hi All, This is my first post here so be gentle. I've the following question: Suppose you have a parameter X, given by X=g(Y), that could only...

    Started by jpcgandre‎, 11-14-2011 03:58 PM
    • Replies: 6
    • Views: 2,557
    11-15-2011, 06:58 AM Go to last post
  55. Help required with a linguistics-related probability problem

    Hello all, As someone with very little background in probability theory, I have come across a problem in the writing of my linguistics MSc thesis...

    Started by Viaveritsa‎, 11-16-2011 12:50 PM
    • Replies: 6
    • Views: 2,040
    11-16-2011, 03:34 PM Go to last post
  56. Probability Distribution Function

    Hello guys hope you are good, I have a final question. Suppose that the r.v X represents the radius of a ball and that X has probability...

    Started by Darktranquillity‎, 12-05-2011 11:21 AM
    • Replies: 6
    • Views: 2,277
    12-05-2011, 12:28 PM Go to last post
  57. 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: 5,635
    12-25-2011, 06:15 PM Go to last post
  58. Product Normal Distribution

    Hi, Summing normal distributions is nice and easy, providing another normal distribution. But multiplying gives the Product Normal Distribution....

    Started by BigBugBuzzz‎, 01-20-2012 10:51 AM
    productnormaldist
    • Replies: 6
    • Views: 15,974
    01-20-2012, 12:54 PM Go to last post
  59. Probably a stupid question

    how do i calculate the exact probablity that a number of taxpayers who support a reduction in funding falls between 342 and 375 people? (sample size...

    Started by figs824‎, 01-21-2012 03:02 PM
    • Replies: 6
    • Views: 1,912
    01-21-2012, 04:45 PM Go to last post
  60. [SOLVED] 1st year Biostats student very lost!!! Please help...

    I have this question that I believe I have the correct answer for, however, I am unsure as to exactly what the proper formula is (and obviously...

    Started by kelly g‎, 01-27-2012 07:32 PM
    • Replies: 6
    • Views: 2,423
    01-27-2012, 09:01 PM Go to last post

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