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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 10:44 AM
    • Replies: 0
    • Views: 11,763
    09-30-2005, 10:44 AM Go to last post
  1. Question Calculating Sensitivity and Specificity of Combined Testing...With a Surprise.

    Ok guys. I have an interesting question. I'm a biomedical engineering student from Georgia Tech and for one of my classes I have to implement...

    Started by ErikSampayo‎, 01-27-2015 01:49 PM
    conditional testing, rescreening, screening, sensitivity, specificity
    • Replies: 2
    • Views: 100
    01-27-2015, 02:14 PM Go to last post
  2. Acceptance Testing - Calculating Type 1 and Type 2 Errors

    Lots of forty components each are called acceptable if they contain no more than five defectives. The decision procedure is to inspect components...

    Started by bluejay‎, 01-27-2015 01:51 AM
    • Replies: 1
    • Views: 194
    01-27-2015, 11:25 AM Go to last post
  3. When are you using: Bayes or discriteet or norminal


    Started by ozkan‎, 01-25-2015 06:55 PM
    • Replies: 0
    • Views: 62
    01-25-2015, 06:55 PM Go to last post
  4. Probability of unavailability and one more question please help to me.

    Hi all helpful people :) Please answer that , I didn't think about it . My knowledge not enough for this question. 4. In a certain company, the...

    Started by gkhn_06‎, 01-24-2015 12:05 PM
    • Replies: 0
    • Views: 108
    01-24-2015, 12:05 PM Go to last post
  5. Conditional probability of an event given two independent events

    I am dealing with an interesting probability problem. I had 16 subjects randomly divided into 4 different rooms, each room having 4 seats. The...

    Started by Blain Waan‎, 01-19-2015 11:17 AM
    probability, probability help, probability question
    • Replies: 2
    • Views: 199
    01-20-2015, 08:14 AM Go to last post
  6. Joint Probability Distribution from Drawing 5 Cards

    Consider drawing 5 cards from a standard poker deck without replacement. I am attempting to construct a joint probability distribution table for 2...

    Started by wyngarth‎, 01-03-2015 03:40 PM
    • Replies: 8
    • Views: 403
    01-17-2015, 12:58 PM Go to last post
  7. Expected utility of portfolio problem

    Can someone show that the problem of maximizing 2.1 is equivalent to the problem of maximizing 2.2. Step by step description please. See the attached...

    Started by Stats2‎, 01-16-2015 03:32 PM
    • Replies: 0
    • Views: 90
    01-16-2015, 03:32 PM Go to last post
  8. Question Multiple Events and Cumulative Probability Calculation(s)

    Hi! I don't know statistics, hopefully someone will kindly help me. I'd like to learn how to calculate the probability of an event happening Y...

    Started by Nalgarryn‎, 01-13-2015 03:16 PM
    independent events, iterated probability, multiple events
    • Replies: 1
    • Views: 164
    01-13-2015, 03:22 PM Go to last post
  9. Probability in online casino slot machines: Dilemma

    Hi there, I am new here, but I have come as I am interested to see what people make of this. I am part of an online community that collectively...

    Started by packtim‎, 01-13-2015 08:38 AM
    • Replies: 3
    • Views: 131
    01-13-2015, 03:07 PM Go to last post
  10. [ASK] Doctrine of Chances by Abraham de Moivre

    Doctrine of Chance is a book published by Abraham de Moivre in 1718. It was on the sbuject of probability containing many innovations such as method...

    Started by Monox D. I-Fly‎, 01-09-2015 10:29 PM
    • Replies: 0
    • Views: 295
    01-09-2015, 10:29 PM Go to last post
  11. Standard deviation

    Hello To solve the exercise below, I need the standard deviation =σ I have no clue to get it out of the values below: A researcher wants to know...

    Started by roger20‎, 01-09-2015 01:17 PM
    • Replies: 3
    • Views: 173
    01-09-2015, 01:38 PM Go to last post
  12. Request for help in probability question.

    There are 50,000 applicants out of which, 20,000 applicants needs to be picked. 1. What is the probability that an applicant say "Joel" is...

    Started by Johnutsa1‎, 01-08-2015 04:08 PM
    • Replies: 0
    • Views: 147
    01-08-2015, 04:08 PM Go to last post
  13. Request for help on probability.

    Hi All, I need your help to solve this question. I am preparing for exam and trying to solve this question. A ball is selected from a box...

    Started by anna1999‎, 01-07-2015 03:37 PM
    • Replies: 1
    • Views: 159
    01-07-2015, 03:47 PM Go to last post
  14. Reversing the moment generating function

    So this is my moment generating function \frac{e^{-2t}+e^{-t}+e^{t}+e^{2t}}{4} Now i need to find the PDF or CDF So i think the moment...

    Started by studentbelg‎, 01-06-2015 02:29 PM
    • Replies: 1
    • Views: 178
    01-06-2015, 05:24 PM Go to last post
  15. Computing MLE estimate

    So I have so i'm stuck at taking the log :mad: can somoene help me ?

    Started by studentbelg‎, 12-01-2014 03:33 PM
    • Replies: 5
    • Views: 481
    01-06-2015, 01:17 PM Go to last post
  16. Conditional normal implying independence

    So reading a book someone comment that e \lvert x \sim N(0,1) hence e is independent of x. Why is this the case? Trying to prove this to myself...

    Started by JesperHP‎, 01-03-2015 12:59 PM
    • Replies: 1
    • Views: 194
    01-06-2015, 05:19 AM Go to last post
  17. Expected value and variance of profit

    Hello all, I have this question, which I think I partially knows how to solve, but need some completion. "A man is playing versus a machine in the...

    Started by Yankel‎, 01-06-2015 02:43 AM
    • Replies: 1
    • Views: 183
    01-06-2015, 04:53 AM Go to last post
  18. P-value from test statistic

    I'm given a test-statistic of 2.4 in one of those H0 type problem with a 0.05 significance level. In the z-table, if you look up 2.4, it says 0.0082....

    Started by robbiesqp‎, 12-11-2009 07:02 PM
    • Replies: 8
    • Views: 16,396
    01-01-2015, 10:33 PM Go to last post
  19. An engineer has observed that the gap times between...

    I am struggling with this question ..please help An engineer has observed that the gap times between vehicles passing a certain point on a...

    Started by Jeff Hardy‎, 12-31-2014 11:19 AM
    • Replies: 2
    • Views: 269
    12-31-2014, 04:23 PM Go to last post
  20. precision of two independent classifiers

    Consider two classifiers A and B giving binary labels to a big set of candidates, say, we have a million cats and a million dogs for labeling. Assume...

    Started by Zewei‎, 12-29-2014 10:12 AM
    machine learning, precision, probability
    • Replies: 0
    • Views: 192
    12-29-2014, 10:12 AM Go to last post
  21. Please help calculate the odds of this

    First off, let me say I know very little about math and even less about probabilities. I am a father of two teenage boys. One of them gave me a...

    Started by acofgb‎, 12-22-2014 12:55 PM
    • Replies: 11
    • Views: 483
    12-23-2014, 05:42 PM Go to last post
  22. Group Probability Problem

    Hi, I'm having a difficult time figuring out an approach to a problem and could use some help -- if I have a team of 5 basketball players, each...

    Started by bprs0713‎, 12-18-2014 08:40 PM
    • Replies: 3
    • Views: 298
    12-19-2014, 01:31 PM Go to last post
  23. Interpreting negative binomial regression with log transformed independent variables

    My independent variables were highly skewed, so to normalise the distribution they were log transformed. Also since there were zeros in the data,...

    Started by peter t.‎, 12-19-2014 01:12 PM
    incidence rate, lognormal, negative binomial model, regression
    • Replies: 0
    • Views: 167
    12-19-2014, 01:12 PM Go to last post
  24. Question Confidence Intervals

    Hi I am new to stats and really spending lots of time on concepts which I can build on, I thought I was fairly comfortable with confidence...

    Started by Golf39‎, 12-16-2014 05:53 AM
    • Replies: 5
    • Views: 388
    12-19-2014, 03:12 AM Go to last post
  25. Dice probability problem

    Hi everyone, I have a simple dice problem but am having trouble with it because it's hard to google something like this. Here it is... I have...

    Started by benali‎, 12-15-2014 07:39 PM
    • Replies: 2
    • Views: 316
    12-16-2014, 08:56 AM Go to last post
  26. I can't undertand two problem..

    Hello everyone, I can't solve 2 problem during 4 hours.... Suppose that a tray of eggs consists 10 egg and there are 10 trays(i.e. there is 100...

    Started by doggra‎, 12-15-2014 05:50 AM
    • Replies: 3
    • Views: 262
    12-15-2014, 11:40 AM Go to last post
  27. red balls and blue balls

    Hi there everyone I'm a complete newbie to probability and currently taking a foundation degree at Uni of which statistics is one of my modules. I...

    Started by timlazisa‎, 12-10-2014 01:01 PM
    • Replies: 9
    • Views: 383
    12-14-2014, 07:40 AM Go to last post
  28. Tree diagram

    trying to complete this mock test and paper I don't get this at all can anyone help please? I have attached a pdf of the paper and 3 questions.

    Started by timlazisa‎, 12-12-2014 04:44 PM
    • Replies: 0
    • Views: 195
    12-12-2014, 04:44 PM Go to last post
  29. confidence levels on 2d \chi^2 grid, where the minimum \chi^2 is not near 1.

    Hallo everybody! I have the following problem: I obtained a 2D grid of reduced \Chi^2 fits, where the the minimum \Chi^2 is far from unit (1)....

    Started by Trifonov‎, 12-12-2014 04:38 AM
    • Replies: 0
    • Views: 228
    12-12-2014, 04:38 AM Go to last post
  30. 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: 317
    12-11-2014, 04:58 PM Go to last post
  31. Probability problem

    An experiment consists of flipping one coin four times. Give a pair of events that are independent and a pair of events that that are dependent, and...

    Started by BubblesMagee‎, 12-11-2014 03:12 AM
    • Replies: 0
    • Views: 178
    12-11-2014, 03:12 AM Go to last post
  32. Distribution of a function of random variables problem

    First off, I'm new to this forum and Probability and Statistics. I'm a junior in college and currently taking my first course in this subject and...

    Started by tnvy04‎, 12-10-2014 10:07 PM
    • Replies: 1
    • Views: 183
    12-10-2014, 11:19 PM Go to last post
  33. Equal chance of random selection when halves of set are balanced?

    Design: For 18 trials numbers (either 0 or 1) are randomly selected, a random portion of the first 9 are 0 and the last 9 are set as the opposite...

    Started by Oeei922331100‎, 12-10-2014 02:34 PM
    combinatorics, permutation, probabilistic sampling, probabilities, random
    • Replies: 0
    • Views: 142
    12-10-2014, 02:34 PM Go to last post
  34. Question: Determining percentage of probability

    Hello, I'm in the middle of working on an assignment that involves determining probability. I wanted to see if I am on the right track. Any help...

    Started by sditizio‎, 12-09-2014 12:07 AM
    • Replies: 1
    • Views: 206
    12-09-2014, 01:34 AM Go to last post
  35. probability function of sum of multiple normal distributions

    I have four normally distributed random variables which may/may not be correlated. I want to find the probability distribution function of the...

    Started by Sf26‎, 12-08-2014 01:30 PM
    • Replies: 4
    • Views: 344
    12-08-2014, 02:50 PM Go to last post
  36. Central Limit Theorem

    If X is a Gamma(n,1). For which values of n we have P(|\frac{X}{n}-1|>0.01)<0.1 If n=n_0 is the first value of n that satisfies the above equation,...

    Started by askazy‎, 12-06-2014 10:55 AM
    • Replies: 3
    • Views: 363
    12-08-2014, 06:25 AM Go to last post
  37. Convergence in Distribution

    If X_n is a sequence of random variables independent and X_n is Binomial(n,p) with 0<p<1 and either T_n=\frac{X_n}{n} for all n 1) Show that...

    Started by askazy‎, 12-06-2014 05:50 PM
    • Replies: 3
    • Views: 384
    12-07-2014, 11:08 AM Go to last post
  38. Markov Inequality

    If X_1,X_2,X_3...X_{20} are independent random variables with common distribution Poisson(1). Find with markov inequality a upper limit for...

    Started by askazy‎, 12-06-2014 03:00 PM
    • Replies: 6
    • Views: 224
    12-06-2014, 04:58 PM Go to last post
  39. Binomial Test in Excel

    What is the probability of getting AT LEAST 79 out of 90 correct on a True or False test if you are guessing on every question? I think I need to...

    Started by bengalgirl‎, 12-06-2014 04:46 PM
    binomial distribution, excel
    • Replies: 0
    • Views: 267
    12-06-2014, 04:46 PM Go to last post
  40. Convergence

    If Z_n = \frac{1}{n}*\sum_{i=1}^nX_i^2 where X_i=N(\mu,\sigma^2) 1) Show that Z_n \rightarrow^p \mu^2+\sigma^2(convergence in probability) I...

    Started by askazy‎, 12-03-2014 04:50 PM
    • Replies: 12
    • Views: 514
    12-06-2014, 10:46 AM Go to last post
  41. Strong Law of Large Numbers

    If X_n is a sequence of random variables and Cov(X_i,X_j)=0 for all i,j and Var(X_j)\leq c for all j. Show that X_n satisfies the strong law of large...

    Started by askazy‎, 12-05-2014 07:13 PM
    • Replies: 2
    • Views: 288
    12-06-2014, 10:46 AM Go to last post
  42. A Couple of Questions Re: Birth and Death Processes

    Hello, I have a few homework questions regarding birth & death processes (CTMCs) that I'm having trouble solving: 1) Suppose a CTMC has a death...

    Started by jli‎, 12-06-2014 04:18 AM
    • Replies: 0
    • Views: 287
    12-06-2014, 04:18 AM Go to last post
  43. Joint Normal distributed independent random variable question

    Sam's bowling scores are approximately normally distributed with mean 110 and standard deviation 11, while John's scores are normally distributed...

    Started by doublea500‎, 12-05-2014 03:07 PM
    • Replies: 1
    • Views: 312
    12-05-2014, 05:24 PM Go to last post
  44. Convergence in probability

    If Z_n=\frac{1}{n}\sum_{i=1}^nX_i^2 and W_n=\frac{1}{n}\sum_{i=1}^n(X_i-\bar{X})^2 Show that V_n=Z_n - W_n \rightarrow^p \mu^2 What I think:...

    Started by askazy‎, 12-05-2014 11:21 AM
    • Replies: 6
    • Views: 338
    12-05-2014, 04:09 PM Go to last post
  45. Uniform Random Variables Joint Distribution Queston

    x and y are uniformly and independently distributed over the interval . Find the probability that |x−y|, the distance between x and y, is less than...

    Started by doublea500‎, 12-05-2014 01:24 PM
    • Replies: 2
    • Views: 313
    12-05-2014, 03:04 PM Go to last post
  46. Can somebody help me look this over to verify if it is correct?

    I have this project I am working on. I want to make sure it is correct. My professor helped me with part of it in the middle, and I had difficulty...

    Started by bershe‎, 12-05-2014 08:09 AM
    • Replies: 0
    • Views: 258
    12-05-2014, 08:09 AM Go to last post
  47. Probability of k pairs of birthdays in a group of n people

    Could somebody please tell me the formula for computing the probability that exactly k pairs will have the same birthday out of a group of n people? ...

    Started by Leo Simon‎, 11-30-2014 05:50 PM
    birthday problem
    • Replies: 10
    • Views: 654
    12-02-2014, 10:24 AM Go to last post
  48. 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: 548
    12-01-2014, 10:12 AM Go to last post
  49. Is this solvable?

    Is this a solvable problem? Can someone please explain one way or the other…here goes: There are two parking lots in a bad part of town: Lot A and...

    Started by StatisticsChallenged‎, 11-30-2014 10:58 PM
    • Replies: 1
    • Views: 282
    11-30-2014, 11:48 PM Go to last post
  50. Simple prob question

    Hey all, I have a very simple Q and would appreciate if you could confirm the right answer with me. Scenario: I am playing the lottery and have...

    Started by ValentinK‎, 11-29-2014 06:44 PM
    • Replies: 2
    • Views: 333
    11-30-2014, 08:00 AM Go to last post
  51. Secret santa problem

    Hi everybody At my work we just started a secret santa game. We are 6 and we ended up getting an outsider to mix 6 pieces of paper, each with one...

    Started by Hugosson‎, 11-27-2014 11:06 AM
    • Replies: 5
    • Views: 406
    11-28-2014, 06:26 PM Go to last post
  52. Street con, probability problem from my statistics class.

    Hello our teacher recently gave us a problem to take home and work on and I think I have most of it figured out but I would like some input and help....

    Started by sergio1er‎, 11-25-2014 12:28 AM
    • Replies: 1
    • Views: 348
    11-25-2014, 04:35 PM Go to last post
  53. Question Homework help with Confidence Intervals & Estimating Probability Proportions?

    I'm super lost on a few sets of my statistics homework and wondering if anyone can walk me through this so I can finish the rest of the questions as...

    Started by bjk8090‎, 11-24-2014 11:33 AM
    • Replies: 2
    • Views: 253
    11-24-2014, 02:46 PM Go to last post
  54. True odds vs Bookmaker odds?

    Hello, I'm new to the forum and very excited to be here. However I have a question that brought me here. i attach a picture to show more clearly what...

    Started by VaBanque‎, 11-06-2014 02:01 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 641
    11-24-2014, 01:55 AM Go to last post
  55. When does the Normal Distribution arise?

    Hello guys, Studying the multivariate normal distribution (and the univariate one as well), I found in Muirhead (1982) that the normal distribution...

    Started by Axs_Souza‎, 11-23-2014 04:57 PM
    normal distribution, random effects
    • Replies: 1
    • Views: 290
    11-23-2014, 05:19 PM Go to last post
  56. Distribution

    Hello, I having doubts on this issue 1) If X~Gamma(a,B) and Y~Beta(γ,B-γ), respectively with B>= 0 and γ>= 0, such that γ <= B. Which...

    Started by askazy‎, 11-21-2014 09:11 AM
    • Replies: 10
    • Views: 508
    11-22-2014, 04:56 PM Go to last post
  57. Hard probability question/game-binomial dist.

    Consider 50 people and series of 10 rooms. Each room has, for example, 5 doors that will open to the next room with known (totally known, including...

    Started by bhr23‎, 11-22-2014 09:58 AM
    binomial, game
    • Replies: 0
    • Views: 248
    11-22-2014, 09:58 AM Go to last post
  58. Combination and Permutation question

    Hi guys, I'm new to the field of probability and statistics, I have a question that I can't seem to be able to solve, it would be a great help if you...

    Started by devick‎, 11-16-2014 07:57 AM
    • Replies: 2
    • Views: 447
    11-20-2014, 11:03 PM Go to last post
  59. Expected Value and Variance

    If a number X is chosen at random from the integers 1, 2, . . . , 100, what is the expected value and the variance of X? Expected value is just...

    Started by panda‎, 11-14-2014 09:35 PM
    • Replies: 3
    • Views: 371
    11-15-2014, 07:12 PM Go to last post
  60. Stats help

    A biology student wishes to assess the amount of calories in a certain brand of chocolate energy bars. A sample of bars is taken and the calories...

    Started by pankti_ptl‎, 11-13-2014 02:12 PM
    • Replies: 1
    • Views: 402
    11-14-2014, 05:32 PM Go to last post

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