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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: 30,353
    09-30-2005, 09:44 AM Go to last post
  1. basic problem computing pdf

    If I have a pdf, say X~Uniform and Y= -X, would the pdf of Y be 1/6 ? How would I get the pdf using P(-X < - y) = P(X > y) = 1 - P( X < y) = 1-...

    Started by stephanie‎, 11-28-2013 10:33 PM
    • Replies: 2
    • Views: 1,571
    11-29-2013, 03:22 AM Go to last post
  2. 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: 4,903
    09-14-2008, 02:50 PM Go to last post
  3. Basic Question

    Hi all, I feel a little embarrassed about this, but: what is the rule linking the probability of an event A to the weighted sum of its sub-events?...

    Started by justin.sharber‎, 12-04-2011 09:25 PM
    expectation
    • Replies: 2
    • Views: 1,369
    12-04-2011, 09:43 PM Go to last post
  4. Basic Question

    Ok the answer might be really obvious here but I am getting a blank at the moment. If there is a 20% chance of a child getting a disease from...

    Started by Wicket‎, 05-23-2012 11:35 PM
    • Replies: 2
    • Views: 1,482
    05-25-2012, 12:23 AM Go to last post
  5. Basic question about notation

    I'm very sorry, perhpas it is a very basic question but I have I doubt about notation: What does it mean this statement?: E(X)=\int xdF, where F...

    Started by wipeout‎, 11-05-2012 02:08 PM
    • Replies: 2
    • Views: 849
    11-11-2012, 10:10 PM Go to last post
  6. Basic question about the normal distribution

    So it seems like different distributions have different kinds of "experiments" associated with them, like how you use the binomial distribution when...

    Started by Indecisive‎, 07-27-2011 09:26 AM
    • Replies: 3
    • Views: 2,154
    07-31-2011, 02:31 AM Go to last post
  7. Basic Question on Random Variables

    My basic understanding is the following: Upper-Case RV: i.e. X_1 The RV above represents a Random Variable with a Distribution (Bernoulli, Poisson,...

    Started by simplemts‎, 10-24-2012 03:45 PM
    • Replies: 4
    • Views: 2,721
    10-25-2012, 01:34 AM Go to last post
  8. basic question: random variables

    Hello all, I just came across this wonderful forum and was pleasantly surprised by the wealth of information and rich discussion here! I am...

    Started by pamparana‎, 02-19-2013 10:47 AM
    • Replies: 4
    • Views: 2,066
    02-19-2013, 06:34 PM Go to last post
  9. Question Basic Standard Deviation question

    Main information: Studies of the term birth weight (>37 weeks) of babies born in NZ show that the weight of European ethnicity babies is normally...

    Started by successfulfailure‎, 11-15-2012 07:50 PM
    • Replies: 1
    • Views: 1,398
    11-17-2012, 12:13 AM Go to last post
  10. Basic Statistics

    I am sure this is a basic problem that is easily solvable, however, I have not been in a Statistics class in a little over 31 years and have all but...

    Started by mattman519‎, 04-25-2017 11:46 AM
    • Replies: 4
    • Views: 1,340
    04-27-2017, 05:38 PM Go to last post
  11. Basketball probability

    a basketball player has a 40% chance of making a 3 point shot. if the player tries n=12 three pintshots, what is the probability that he makes...

    Started by yoleven‎, 02-05-2011 12:16 AM
    • Replies: 1
    • Views: 4,353
    02-05-2011, 01:59 AM Go to last post
  12. Basketball Question

    Assuming defense has no effect... Team A shoots 100 2pt shots a game, and each shot has a 50% chance of going in. Team B shoots 100 3pt shots a...

    Started by YaoPau‎, 11-13-2009 12:53 PM
    • Replies: 1
    • Views: 2,224
    11-13-2009, 02:09 PM Go to last post
  13. Basketball shooting percentage - binomial distribution?

    I am interested in studying the probability of team field goal percentage being unusually high. In context, I recently watched a women's college...

    Started by DRMORRIS‎, 02-14-2015 01:59 PM
    • Replies: 3
    • Views: 2,458
    02-15-2015, 11:59 AM Go to last post
  14. Basketball winning streak question

    Can anyone please help me figure out how it was concluded that a basketball team with a projected .200% winning percentage has a 47% chance of...

    Started by The Game‎, 11-12-2013 05:48 AM
    • Replies: 4
    • Views: 2,548
    11-13-2013, 01:07 PM Go to last post
  15. Batting Average & Probability

    A softball team's first 4 hitters are Sam (batting average .500), Gina (batting average .400), Tom (batting average .737), and Kerry (batting average...

    Started by smileysara2008‎, 02-26-2008 01:40 PM
    • Replies: 1
    • Views: 5,320
    02-26-2008, 01:43 PM Go to last post
  16. Battleships Game

    Guys, I am struggling to understand how the probability of the Battleships game works. Clearly the variables are a) the area of the grid b) the area...

    Started by Mark Lee‎, 09-02-2012 04:12 AM
    • Replies: 1
    • Views: 1,189
    09-02-2012, 10:14 AM Go to last post
  17. Baye's Formula Confusion!

    Hello, I think I have answered most of this question correctly, but do not quite understand how to find P(D^c|F^c) . The question is as...

    Started by Slime‎, 01-13-2013 12:15 AM
    • Replies: 3
    • Views: 4,831
    01-13-2013, 06:49 PM Go to last post
  18. Baye's Rule Help

    Hello I have this question and I am having trouble figuring it out. Medical case histories indicate that different illnesses may produce...

    Started by HHPS‎, 03-08-2012 06:17 PM
    • Replies: 3
    • Views: 4,802
    03-09-2012, 12:43 PM Go to last post
  19. Baye's Theorem

    Hi, I have two questions that I am struggling with, that concern the Baye's Theorem.... 1) Mr. Smith's gardener is not dependable; the probability...

    Started by Eulia‎, 11-12-2006 04:16 PM
    • Replies: 1
    • Views: 6,448
    11-13-2006, 05:01 AM Go to last post
  20. Baye's Theorem Urn Problem

    Hi, I am having some trouble with this problem: Suppose there are 3 urns. You choose one from which you will choose 2 balls from. Urn 1 has 4 red...

    Started by mobius0‎, 07-09-2009 10:17 PM
    • Replies: 5
    • Views: 5,356
    07-11-2009, 10:44 AM Go to last post
  21. Bayes Estimator for Bernoulli/Beta

    Let X be number of successes out of n items The prior is a beta distribution. n := 20 a := 5 b := 10 I need to determine the number of...

    Started by throwback‎, 01-31-2012 07:44 PM
    • Replies: 1
    • Views: 2,997
    02-02-2012, 12:51 PM Go to last post
  22. 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: 2,217
    03-02-2017, 04:20 AM Go to last post
  23. Bayes Probability question

    Question: Yearly automobile inspections are required for residents of the state of Pennsylvania. Suppose that 18% of all inspected cars in...

    Started by 10minmail‎, 10-19-2014 04:57 AM
    • Replies: 0
    • Views: 2,557
    10-19-2014, 04:57 AM Go to last post
  24. Bayes Problem

    A diagnostic test is designed to detect whether subjects have a certain disease. A positive test outcome predicts that a subject has the disease....

    Started by jamesmartinn‎, 02-04-2010 10:19 PM
    • Replies: 2
    • Views: 3,877
    02-06-2010, 11:08 AM Go to last post
  25. Bayes Rule Headache

    1. Say we are interested in the effect of a new medication that may help people with an illness. 40% of all people in our population of interest have...

    Started by gradstud‎, 09-21-2011 10:39 AM
    • Replies: 0
    • Views: 2,786
    09-21-2011, 10:39 AM Go to last post
  26. Bayes Rule Problem

    Ok, I'm trying to learn Baye's Rule, but I'm very new to it. I understand the rule to say P(A given B) = P(B given A) x P(A) / Assuming that...

    Started by newtostats‎, 08-31-2007 07:02 PM
    • Replies: 1
    • Views: 2,741
    09-04-2007, 09:33 AM Go to last post
  27. Exclamation Bayes Rule!

    Hi, My question is: A company wishes to evaluate the effectiveness of a marketing campaign. Seventy-five percent of all customers using the...

    Started by Zahra98‎, 01-09-2017 07:43 PM
    • Replies: 1
    • Views: 2,782
    01-09-2017, 08:22 PM Go to last post
  28. Lightbulb Bayes Theorem

    I have been doing some problems with Bayes Theorem, but I have one question that is more complex than the others and was wondering if anyone can help...

    Started by AStudent‎, 02-09-2008 11:03 AM
    • Replies: 1
    • Views: 3,110
    02-10-2008, 08:29 PM Go to last post
  29. Question Bayes Theorem - JohnM vs my textbook

    To JohnM or anyone who knows... I am struggling with positive and negative predictive values (PPV and NPV) homework problems. My textbook...

    Started by ALvr‎, 09-10-2006 05:19 PM
    • Replies: 2
    • Views: 2,994
    09-10-2006, 08:27 PM Go to last post
  30. 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: 4,971
    08-03-2008, 12:55 PM Go to last post
  31. bayes theorem DNA statistics

    A crime is committed in an isolated commnity and a single bloodstain is left at the scene of the crime. In this community, 74&#37; of the adult male...

    Started by redrottweiller‎, 04-07-2009 02:03 PM
    • Replies: 0
    • Views: 3,014
    04-07-2009, 02:03 PM Go to last post
  32. Bayes Theorem Question

    Hello all, I have a homework question which I can not figure out: A stock market analyst examined the prospects of the shares of a large number...

    Started by furcal101‎, 09-22-2008 07:19 PM
    • Replies: 1
    • Views: 5,214
    09-22-2008, 11:42 PM Go to last post
  33. Bayes Theorem Question for Probability Newbie

    Hi, I'm trying to brush on probability for a graduate class. I've been reading about bayes theorem, which my book states as: P(A | B) = P(B |...

    Started by prob_question‎, 09-05-2011 08:25 AM
    • Replies: 2
    • Views: 2,498
    09-05-2011, 10:42 AM Go to last post
  34. Bayes theory interview question.

    This question is a typical interview question at a job I am currently seeking. The reason I am posting it is I have had different answers from...

    Started by ntyris9‎, 09-12-2012 05:22 PM
    • Replies: 3
    • Views: 7,571
    09-12-2012, 08:45 PM Go to last post
  35. Bayes thoerem, can you check my solution please?

    Hi, I'm terrible at statistics, i hope someone can help. A ship sank into the sea and is now laying in a fixed but uknown position on the bottom...

    Started by any_body‎, 03-05-2012 07:59 AM
    bayes thoerem
    • Replies: 6
    • Views: 2,190
    03-05-2012, 12:20 PM Go to last post
  36. Bayes' Priors

    With a Bayes factor, when specifying priors found in previous studies, I know to use 0 as the mean p(population value given theory) when using a half...

    Started by op2222‎, 11-06-2014 04:59 AM
    • Replies: 0
    • Views: 1,483
    11-06-2014, 04:59 AM Go to last post
  37. Bayes' Rule with Random Variables

    Hello! I'm having so much trouble trying to figure out how to do part (b) of the following problem: The probability that any child in a certain...

    Started by jumblebee‎, 09-14-2015 04:53 PM
    • Replies: 0
    • Views: 3,427
    09-14-2015, 04:53 PM Go to last post
  38. Bayes' Theorem

    Hi guys, I was hoping somebody might be able to help me with this question. The information I am given: Gamma1 = the risk of disease for...

    Started by abc123‎, 03-20-2008 07:34 AM
    • Replies: 0
    • Views: 2,653
    03-20-2008, 07:34 AM Go to last post
  39. Bayes' Theorem and Conditional Probability

    Hello! So I have a question with regards of a mix of results. I want to change the posterior into a form I know. \mathbb{P}\left( \mu | y,H_1...

    Started by risorial‎, 09-08-2010 02:10 PM
    • Replies: 2
    • Views: 2,614
    09-12-2010, 06:35 PM Go to last post
  40. Bayes' Theorem and improper priors

    Hello! I know Bayes' Theorem applies to both discrete and continuous probability distributions, and also seeing as how, given certain conditions,...

    Started by risorial‎, 08-24-2010 02:51 PM
    • Replies: 0
    • Views: 2,520
    08-24-2010, 02:51 PM Go to last post
  41. Bayes' Theorem applied to poker?

    please delete this post

    Started by coveby‎, 06-01-2014 05:46 AM
    poker bayes theorem
    • Replies: 1
    • Views: 1,873
    06-01-2014, 11:00 AM Go to last post
  42. Bayes' Theory

    Hi i'm currently working on a horse race prediction project and trying to include bayes' theory in my project. The thoery is new to me I am trying to...

    Started by flag3k‎, 04-17-2010 11:45 AM
    • Replies: 2
    • Views: 4,637
    04-19-2010, 03:21 AM Go to last post
  43. Question Bayes's Theorem

    Hi! Say there is a deck of 100 cards: Red w/ numbers = 40 Red w/ figures=15 Black w/ numbers=35 Black w/ figures=10 The only information...

    Started by DrAnthonyRodriguez‎, 05-22-2015 07:42 AM
    bayes' theorem
    • Replies: 4
    • Views: 1,606
    05-23-2015, 03:22 AM Go to last post
  44. bayes's theorem and conditional probability question

    chat **** get banged

    Started by shazooby‎, 03-22-2016 10:51 AM
    bayes' theorem, conditional probabilities, probability
    • Replies: 2
    • Views: 1,880
    03-23-2016, 01:43 PM Go to last post
  45. Bayes, and the Horse He Rode In On

    A professor presented this question: "If a cancer screen comes back positive in 68 of 75 cases of actual cancer and in 5 of 191 cases of no cancer,...

    Started by raywood‎, 11-09-2012 04:10 PM
    bayes, calculator, probability, screening
    • Replies: 2
    • Views: 1,911
    11-09-2012, 07:15 PM Go to last post
  46. Exclamation Bayes- Please God let me be right!

    A person chosen at random from the population of a given city is given a chest X-ray, and the results turn out to be “positive” For the sake of...

    Started by elce‎, 04-15-2006 11:41 PM
    • Replies: 3
    • Views: 2,483
    04-29-2006, 07:17 PM Go to last post
  47. bayesian

    I had a question about the bayesian estimator. My question comes directly from a wikipedia page on the subject. ...

    Started by bres6486‎, 01-08-2009 03:20 PM
    • Replies: 5
    • Views: 3,259
    01-16-2009, 12:52 AM Go to last post
  48. Bayesian and Probability

    A certain disease has infected 2% of the population. The firm has annoucned that 90% of those infected will show a postive test result , while 95% of...

    Started by xenovia‎, 03-17-2015 07:26 PM
    • Replies: 14
    • Views: 2,575
    03-18-2015, 03:39 PM Go to last post
  49. Smile Bayesian Approach To Combine Multiple Weighted Inputs

    I'm beginning to learn about Bayesian theory but I'm stumped on the ideal approach for combining multiple weighted inputs. Here's an example to make...

    Started by cmarin‎, 05-07-2016 06:16 PM
    bayesian inference
    • Replies: 2
    • Views: 1,198
    05-08-2016, 10:59 AM Go to last post
  50. Bayesian conclusion scale with uneven data distribution. Possible?

    I have two sets of data distribution between 0 to 100%. I was thinking of using the Bayes theorem of explaining the data distribution. More info on...

    Started by mystvearn‎, 10-15-2012 04:25 AM
    • Replies: 4
    • Views: 1,878
    10-15-2012, 06:11 AM Go to last post
  51. 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: 1,789
    05-13-2015, 03:26 AM Go to last post
  52. Bayesian exercise

    -2 down vote favorite I cant get my head round the following exercise: You are testing dice for a casino to make sure that sixes do not come up...

    Started by randomrun‎, 01-18-2017 09:00 AM
    bayes, bayesian inference, probability
    • Replies: 5
    • Views: 3,178
    01-18-2017, 01:56 PM Go to last post
  53. Bayesian formula with multiple events

    I am trying to predict next location of the user knowing his current (t) and previous location (t-1). I am trying to use Bayesian networks for this....

    Started by anuket‎, 01-23-2016 10:44 AM
    • Replies: 0
    • Views: 1,199
    01-23-2016, 10:44 AM Go to last post
  54. Bayesian inference

    Hello, I am having trouble understanding Bayesian inference (all those parameters, data, prior/posterior distributions). It's all a little bit...

    Started by john83‎, 05-31-2012 03:07 PM
    • Replies: 0
    • Views: 2,180
    05-31-2012, 03:07 PM Go to last post
  55. Bayesian inference - or maybe i'm doing that wrong?

    So first of all - hello! Now, my problem: So I started baye's theorem, and tutor said, that mostly i will need that formula: In denominator...

    Started by Lode‎, 09-09-2011 11:36 AM
    • Replies: 3
    • Views: 2,512
    09-10-2011, 10:54 AM Go to last post
  56. Bayesian inference -(unknown mean and variance | and a proof)

    hello, i take a bayes lesson. there are 3 questions as my homework, i did one of them. i am new to statistics, so instructor said i can get help as...

    Started by aliyilmaz‎, 10-22-2010 09:47 AM
    • Replies: 4
    • Views: 5,098
    10-22-2010, 05:07 PM Go to last post
  57. Angry Bayesian kills me

    I have been practicing this Bayesian thing as you can tell.. so here I have made another attempt to get my concepts clear, If the pre-test...

    Started by SadieKhan‎, 09-22-2010 04:12 PM
    • Replies: 11
    • Views: 3,897
    09-23-2010, 12:54 AM Go to last post
  58. Bayesian Network - Dependency Direction

    Hi There, I am trying to build a Learning Bayesian Network model to understand Traffic density. Traffic density is to be explained by variables...

    Started by Judah‎, 11-13-2015 05:41 PM
    • Replies: 1
    • Views: 1,450
    11-23-2015, 11:43 AM Go to last post
  59. Bayesian posterior

    Hi I am trying to put together a Bayes posterior distribution. I must have made a mistake because I am not able to manipulate the variables into...

    Started by PeterVincent‎, 04-20-2009 08:39 AM
    • Replies: 0
    • Views: 2,389
    04-20-2009, 08:39 AM Go to last post
  60. Bayesian prediction interval

    Started by TrueTears‎, 08-14-2013 06:57 AM
    • Replies: 8
    • Views: 2,773
    08-14-2013, 09:37 AM Go to last post

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