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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: 30,180
    09-30-2005, 09:44 AM Go to last post
  1. Deciding how many averages are sufficient

    Hi, I am performing the following operations: All vectors have the same length. Step 1. Define a vector of constants X Step 2. Create a...

    Started by sigma‎, 10-11-2012 03:08 PM
    • Replies: 3
    • Views: 1,776
    10-13-2012, 10:13 AM Go to last post
  2. decile

    hi experts. I 'd like to ask about cluster analysis. to identify the group of customer that which group will have high potential to cancel the...

    Started by Kimudao‎, 05-27-2017 11:34 PM
    • Replies: 0
    • Views: 677
    05-27-2017, 11:34 PM Go to last post
  3. deciles

    Women's weights are normally distributed with a mean of 143 lb and a standard deviation of 29lb. Find the third decile, D3, which separates the...

    Started by megs915‎, 10-24-2005 12:06 PM
    • Replies: 1
    • Views: 4,715
    10-24-2005, 12:20 PM Go to last post
  4. Question decimal answer need for probability

    Happy Meal Problem: McDonalds offers a little toy with its happy meals. They have 5 different toys and each toy has the same probability of appearing...

    Started by sasori‎, 02-27-2012 10:54 PM
    • Replies: 9
    • Views: 3,223
    02-28-2012, 08:39 AM Go to last post
  5. Decision theory

    I came across this question and I could attempt part one , but part two is very confusing though I am not sure if the part 1 that I attempted is even...

    Started by SadieKhan‎, 11-15-2010 02:21 AM
    • Replies: 1
    • Views: 2,664
    11-15-2010, 04:02 PM Go to last post
  6. Decision Trees

    I know how to pull back the tree, but I can't figure out how to draw them from a story! Here's the story, please help the best you can: EnvirNova...

    Started by Kennedy‎, 02-10-2013 05:27 PM
    • Replies: 1
    • Views: 1,193
    02-10-2013, 10:23 PM Go to last post
  7. Decisions: probabilities and preferences

    Hello everybody. I was wondering if anyone could help me with the following problem. I need to decide between three options: a) spend my holiday...

    Started by Alex_Bham‎, 12-24-2012 10:29 AM
    preferences, probabilities
    • Replies: 2
    • Views: 1,652
    12-24-2012, 06:27 PM Go to last post
  8. deck of cards

    A person selects a card from an ordinary deck of cards. If it is a black card, she wins $3. If it is a red card between or including 2 and 8, she...

    Started by Whitney‎, 10-04-2006 11:31 PM
    • Replies: 1
    • Views: 3,799
    10-06-2006, 11:28 AM Go to last post
  9. Decomposition of bivariate normal density

    Hello, I have a question regarding the bivariate normal density. I need to evaluate density p(x,y), where x is a n x 1 vector and y is n*3 x 1...

    Started by Marek‎, 08-28-2012 10:33 AM
    • Replies: 2
    • Views: 1,196
    08-28-2012, 12:28 PM Go to last post
  10. Deconvolution of gamma distribution

    Notation: g(x,a,b) is the gamma distribution with shape a and scale b. The distribution g(x,1,1) is the standard exponential distribution. ...

    Started by trsny‎, 11-15-2009 09:58 AM
    • Replies: 0
    • Views: 3,607
    11-15-2009, 09:58 AM Go to last post
  11. defective parts

    The ABC manufacturing company purchases a certain part from two suppliers (A supplier & B supplier). The parts received from the suppliers are used...

    Started by psu2007‎, 07-10-2009 01:29 PM
    • Replies: 0
    • Views: 4,373
    07-10-2009, 01:29 PM Go to last post
  12. Defects

    I would like to see how I can solve this problem effectively. Thanks for your help in advance. x= no of defects P(x) = prob of defects x ...

    Started by kobebryant‎, 06-22-2008 05:21 PM
    • Replies: 1
    • Views: 2,279
    06-30-2008, 03:49 PM Go to last post
  13. Defining a problem with random variables.

    I am studying the following problem. Take n random normal distributions each with a common standard deviation of s. Call these d(1), d(2)...d(n)....

    Started by Steve Tilley‎, 11-29-2012 12:24 PM
    • Replies: 0
    • Views: 1,760
    11-29-2012, 12:24 PM Go to last post
  14. Defining parameter following survival function

    I am a newbie, with limited statistical skills, so please excuse/correct basic mistakes. My question is about the characteristics of a...

    Started by Iphix‎, 02-09-2012 03:08 AM
    • Replies: 5
    • Views: 1,774
    02-09-2012, 02:10 PM Go to last post
  15. Definition of (objective) Probability

    There are two definition as far as I know (not including subjective probability), and each one has its problems: 1. If O is the set of all equally...

    Started by David1‎, 01-21-2012 06:32 AM
    definition, probability
    • Replies: 1
    • Views: 2,587
    01-21-2012, 09:54 AM Go to last post
  16. 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: 3,436
    10-18-2016, 07:26 AM Go to last post
  17. Demography Probability Question

    Question: What is the probability of having a livebirth (L) at a second birth given that the outcome of the first pregnancy was a stillbirth (D)?...

    Started by wankel‎, 02-07-2008 02:29 AM
    • Replies: 3
    • Views: 2,626
    02-07-2008, 09:58 PM Go to last post
  18. Exclamation DeMorgans Law

    I NEED DESPRETE HELP! I'M GONNA FAIL MY CLASS IF I DON'T GET THE ANSWERS RIGHT! PLEASEEE! Heres the problem: A local TV station predicts a 80%...

    Started by bettyboop1991‎, 11-13-2008 06:31 PM
    • Replies: 0
    • Views: 2,053
    11-13-2008, 06:31 PM Go to last post
  19. Demorgans?

    I have to show the following hold. i) (A U B)' = A' & B' ii) (A & B)' = A' U B' Can someone verify if this thinking is correct? i) x is...

    Started by jamesmartinn‎, 10-17-2010 08:48 AM
    • Replies: 2
    • Views: 2,392
    10-22-2010, 06:31 PM Go to last post
  20. Density and Median

    Help please :confused: The diameter of a ball is a random variable X with the next density: 2x if 0<x<=0.5 1 if...

    Started by Yankel‎, 08-04-2010 06:39 AM
    • Replies: 2
    • Views: 2,079
    08-19-2010, 12:12 PM Go to last post
  21. density function

    I have a problem that says: If U is uniform on , find the density function of U^2. So far I have that F(y)=sqrt(y) Where do I go from there?? I...

    Started by vicky‎, 02-17-2009 04:00 PM
    • Replies: 2
    • Views: 7,169
    02-19-2009, 05:18 PM Go to last post
  22. density function

    hi, i'm working on a problem that goes like: A fire-detection device uses two temperature-sensitive cells (cell A and cell B) acting independent...

    Started by yon‎, 06-03-2009 07:39 PM
    • Replies: 3
    • Views: 4,058
    06-04-2009, 03:25 AM Go to last post
  23. 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
  24. Density function from discrete time values?

    Hello, I have a set of times achieved by an agent and want to determine if a probability density function can be derived from that set. Being a...

    Started by JayBee‎, 06-29-2012 04:14 AM
    • Replies: 1
    • Views: 1,836
    06-29-2012, 08:30 AM Go to last post
  25. Density function?

    Please can you help me solve this the pdf of continues r.v. X where f(x) {(2x 0≤x≤1 0 elsewhere} 1)...

    Started by zulkfal_1981‎, 10-04-2009 06:49 PM
    • Replies: 4
    • Views: 3,158
    10-05-2009, 04:09 PM Go to last post
  26. Density of a random variable

    Professor Roberto has to take an oral examination. The grading scale is as follows: 5: = best and 1: = worst. At most he only gives the note 4. Each...

    Started by alfred_oh‎, 04-30-2013 08:53 AM
    • Replies: 2
    • Views: 1,656
    04-30-2013, 09:22 AM Go to last post
  27. Density of data

    Hi What is the Density of data? I like understand this concept with data example? thanks

    Started by asangari‎, 01-09-2012 04:23 PM
    • Replies: 3
    • Views: 2,548
    01-09-2012, 08:57 PM Go to last post
  28. Density probability of a normal distribution at a point in a CASIO calculator

    I do not understand the utility of calculating the density probability in a point in the case of a continuous variable (for example in the case of...

    Started by PCouper‎, 08-24-2015 12:51 PM
    • Replies: 4
    • Views: 1,441
    08-25-2015, 06:35 AM Go to last post
  29. Post Dependent Event Vs Independent Event Vs Mutually Exclusive Events

    While reading probability book I come across with above terms. Following questions raised in my mind. 1)Are Dependent events always Mutually...

    Started by sachinner‎, 01-14-2013 12:51 PM
    • Replies: 3
    • Views: 25,506
    01-15-2013, 10:04 AM Go to last post
  30. Dependent normal distributions

    I'm doing some stock market analysis for a personal project. If I have two stocks which generate returns which are normally distributed, what is...

    Started by jstonge‎, 10-07-2010 05:17 PM
    • Replies: 4
    • Views: 8,954
    10-08-2010, 01:33 PM Go to last post
  31. Dependent or Independent

    Hello, I am asked the following in an assignment: Let A be the event that a letter picked at random from a piece of English text is T and let B...

    Started by jocali‎, 11-01-2010 05:41 PM
    • Replies: 11
    • Views: 4,646
    11-03-2010, 12:57 PM Go to last post
  32. dependent probability question?

    Hello, I had a question about how to calculate dependent probability. Calculating independent probability is easy, simply multiply the probability...

    Started by random512‎, 11-30-2013 10:36 PM
    • Replies: 0
    • Views: 1,232
    11-30-2013, 10:36 PM Go to last post
  33. Derivative help

    I am having a problem completing a problem because of derivatives. I complete the work down to the part where I get lnL(theta) =nln(theta)- sum...

    Started by statsmom‎, 11-02-2008 12:01 AM
    • Replies: 7
    • Views: 2,660
    11-02-2008, 03:59 PM Go to last post
  34. Derived Random Variable

    Can someone please explain the idea behind this to me? My text says "Assume X is a random variable. Then we can define another r.v. Y = g(X). ...

    Started by beanus‎, 03-02-2012 07:19 PM
    • Replies: 2
    • Views: 3,505
    03-03-2012, 07:43 PM Go to last post
  35. deriving expected value of negative binomial distribution

    Hey all, I've derived the expected value of the binomial distribution, but I can't seem to figure it out for the negative binomial distribution....

    Started by vince‎, 05-13-2007 07:50 PM
    • Replies: 0
    • Views: 11,704
    05-13-2007, 07:50 PM Go to last post
  36. Deriving posterior probability from frequencies

    I'm working through an introductory Bayesian stats text: Doing Bayesian Analysis. Having been away from stats for a while and having never working...

    Started by davidbgonzalez‎, 03-02-2011 07:13 PM
    bayesian, probability question
    • Replies: 5
    • Views: 3,561
    11-29-2012, 01:15 PM Go to last post
  37. Deriving probability distribution

    I've got a dataset of electricity prices for in New York City for the past five years. Surprisingly, prices can be both negative and positive (don't...

    Started by pcappers‎, 12-12-2006 05:12 PM
    • Replies: 1
    • Views: 2,643
    12-13-2006, 06:35 AM Go to last post
  38. Deriving Probability Function from Non-Independent SubFunctions

    Howdy All, I attached a picture (inserted at bottom of post), to help explain what I'm trying to accomplish. In general, I don't need "the answer"...

    Started by some_random_dude‎, 01-26-2016 08:34 PM
    • Replies: 0
    • Views: 1,190
    01-26-2016, 08:34 PM Go to last post
  39. deriving the pmf

    I don't fully understand how to answer part b. Is it asking me to use transformation techniques of the poisson derived in part a? If so, how do i go...

    Started by k.dot‎, 05-01-2016 10:25 PM
    • Replies: 2
    • Views: 1,195
    05-02-2016, 05:26 AM Go to last post
  40. Deriving the sampling (or asymptotic) distribution

    Assume we have the following function: f(p) = \frac{1}{(1-p)d}\ln\left(\frac{1}{T}\sum_{t=1}^{T}\left^{1-p} \right) where d is a constant ...

    Started by TrueTears‎, 02-19-2014 01:41 AM
    • Replies: 3
    • Views: 2,616
    03-02-2014, 01:18 AM Go to last post
  41. Deriving Var from mu and two Ps

    If I know the mean of a normal distribution and two probabilities F1=P(Z>z1) and F2=P(Z>z2), I should be able to derive the Var of the distribution,...

    Started by billylyman‎, 03-13-2013 12:53 PM
    cdf, gaussian distribution, normal
    • Replies: 2
    • Views: 1,449
    03-13-2013, 02:03 PM Go to last post
  42. Describe Sample Space

    Suppose you toss a fair coin until you obtain exactly R heads. 1) What is the probability that K tosses are required? 2) Describe your sample space....

    Started by jamesmartinn‎, 10-16-2010 08:51 PM
    • Replies: 2
    • Views: 6,828
    10-16-2010, 10:27 PM Go to last post
  43. Desperate

    It would be greatly appreciated if I could get some help with the following question. The probability of incurring an insurance claim loss of...

    Started by Gizmo‎, 09-21-2005 01:09 AM
    • Replies: 2
    • Views: 3,339
    05-20-2007, 08:09 PM Go to last post
  44. Desperate to understand....

    Desperate to understand how to calculate p value for my research on object line degradation, I have tried SPSS, etc, but am getting more and more...

    Started by mcsk‎, 01-15-2013 05:18 AM
    • Replies: 3
    • Views: 1,976
    01-16-2013, 01:05 AM Go to last post
  45. 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
  46. Determinant of the variance-covariance matrix

    Let ∑ be the variance-covariance matrix of a random vector X. The first component of X is X1, and the second component of X is X2. Then det(∑)=0...

    Started by kingwinner‎, 10-10-2009 06:15 PM
    • Replies: 0
    • Views: 4,310
    10-10-2009, 06:15 PM Go to last post
  47. Determine distribution and parameters

    I have a question but maybe it's the wrong question so I'll state the task first... I want to make data that looks like the data I'm working with...

    Started by trinker‎, 09-21-2015 03:02 PM
    data generation, distribution
    • Replies: 5
    • Views: 1,577
    09-21-2015, 09:13 PM Go to last post
  48. Determine distribution given moment generating function

    I am given two moment generating functions, and need to calculate some probabilities regarding them. The first is: M(t) = ((2/3)e^t + (1/3))^3 ...

    Started by Lanuk‎, 03-06-2015 12:44 AM
    • Replies: 1
    • Views: 1,438
    03-06-2015, 02:49 AM Go to last post
  49. Determine how close a real distribution is to an ideal one.

    My apologies if this is an insultingly easy question: I'm trying to determine how close a real distribution is to an ideal one. Example: a...

    Started by CECampbell‎, 09-28-2011 08:36 AM
    • Replies: 1
    • Views: 1,563
    09-28-2011, 11:28 AM Go to last post
  50. Post Determine how the event size and sample size get affected and how to find them

    I came across with various types of probability problems. Here I want your expert advice, regarding effect on event size and sample size. And how...

    Started by sachinner‎, 01-15-2013 12:56 PM
    • Replies: 0
    • Views: 1,191
    01-15-2013, 12:56 PM Go to last post
  51. Determine if a worker differs from typical performance?

    I'll start with some details about my specific situation. I've got a database that contains records of jobs, clients, and workers. My goal is to see...

    Started by jeremy_y‎, 08-17-2012 04:30 PM
    confidence, hypothesis testing, probability, statistical significance
    • Replies: 3
    • Views: 1,626
    08-18-2012, 02:03 PM Go to last post
  52. Determine probabilty of a sampled value being <= 40

    Hi all! Brand new poster here, trying to think back to those stats classes that I hated at the time, but now seem fascinating. Ahhhh to be 18 again...

    Started by LogisticsG‎, 09-27-2017 07:08 PM
    • Replies: 2
    • Views: 211
    09-28-2017, 12:14 PM Go to last post
  53. Exclamation Determine the risk (probability) of meeting forecasted demand

    Hi, I'm doing a project for a car company for my final year studying Industrial Engineering. The company forecast demand 4 months ahead but,...

    Started by wbez0601‎, 05-07-2016 07:34 AM
    monte carlo, probability, stochastic modeling
    • Replies: 1
    • Views: 2,416
    05-08-2016, 02:03 PM Go to last post
  54. determine underlying distribution

    Dear all, I am working on this problem and i want to determine what is the underlying distribution in this experiment. I would appreciate if you...

    Started by sassql‎, 09-19-2007 10:09 PM
    • Replies: 0
    • Views: 2,585
    09-19-2007, 10:09 PM Go to last post
  55. Determing Return Periods

    Hello users, I have a cummulative distribution (weibull) for a variable and I want to know how to calculate the return period (5, 10, 15, 20, 50...

    Started by lpmelo‎, 07-16-2009 11:51 AM
    • Replies: 0
    • Views: 2,123
    07-16-2009, 11:51 AM Go to last post
  56. Question Determining a prob mass function? E[X] and Var[X] help please?

    There are 10 chips in a bag: 4 have the number 1 written on them, 2 the number 2, and 4 the number 3. Suppose each chip is drawn with the same...

    Started by Intsecxtanx‎, 09-29-2009 08:49 PM
    • Replies: 1
    • Views: 2,818
    09-29-2009, 10:03 PM Go to last post
  57. Determining a probability

    There are 15 CDs in a box. On 10 of the CDs there are saved data fi les, and the other CDs have no data files saved on them. i) Suppose that 12...

    Started by TheStatsGod‎, 10-23-2012 05:56 PM
    • Replies: 1
    • Views: 1,185
    10-23-2012, 11:00 PM Go to last post
  58. Determining expected ranges, given correlation

    Hi, I have a question relating to whether or not (and if so, how) we can infer range of P10/P90 possible outcomes for a variable given a...

    Started by vinomarky‎, 11-27-2008 06:13 PM
    • Replies: 0
    • Views: 2,667
    11-27-2008, 06:13 PM Go to last post
  59. Determining if a bag of coins contains fair coins

    This is actually a problem from a specific biological dataset, but can be more generally described as follows: I have a bag containing n coins....

    Started by Sunnymilk‎, 06-28-2012 05:26 PM
    • Replies: 1
    • Views: 1,126
    06-28-2012, 07:06 PM Go to last post
  60. Red face Determining Joint PDFs, and Marginal PDFs

    Hi All, I'm going through revision questions, and I am stuck on this particular section all with similar questions. If somebody can give me a guide...

    Started by woody198403‎, 05-09-2008 02:50 AM
    • Replies: 13
    • Views: 12,852
    05-15-2008, 01:04 AM Go to last post

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