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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: 11,528
    09-30-2005, 10:44 AM Go to last post
  1. 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: 308
    Today, 01:55 AM Go to last post
  2. 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, Yesterday 04:57 PM
    normal distribution, random effects
    • Replies: 1
    • Views: 90
    Yesterday, 05:19 PM Go to last post
  3. 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: 253
    11-22-2014, 04:56 PM Go to last post
  4. 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: 78
    11-22-2014, 09:58 AM Go to last post
  5. 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: 197
    11-20-2014, 11:03 PM Go to last post
  6. 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: 170
    11-15-2014, 07:12 PM Go to last post
  7. 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: 224
    11-14-2014, 05:32 PM Go to last post
  8. Maximum likelihood estimation of transition probabilities

    Hi, I'm new to Markov chains but have been advised by a colleague to use this approach for my latest study. I have a basic understanding of the...

    Started by freofan‎, 11-13-2014 04:27 AM
    markov, maximum likelihood, transition matrix
    • Replies: 0
    • Views: 101
    11-13-2014, 04:27 AM Go to last post
  9. Probability - Law of multiplication?

    I'm reading about probability and encountered this problem: http://imgur.com/6xTM9Z1 (I guess the answer of a is 1-0,37=0,63 which is the...

    Started by Concret‎, 11-12-2014 10:07 AM
    • Replies: 0
    • Views: 134
    11-12-2014, 10:07 AM Go to last post
  10. "Show that fY|X(y) is a density function of a true probability distribution"

    Where do I begin?? The course I'm taking is focusing heavily on proofs like this, and I'm studying it at a distance so my opportunity to ask...

    Started by xandalorian‎, 11-11-2014 12:20 AM
    • Replies: 3
    • Views: 173
    11-12-2014, 05:37 AM Go to last post
  11. Post Probability Help

    Hello! Taking an introductory course on statistics in college. Confused about one question. It reads: The IRS reports that 15% of the tax returns...

    Started by glporter‎, 11-12-2014 12:28 AM
    math, probability, probability model
    • Replies: 1
    • Views: 128
    11-12-2014, 02:10 AM Go to last post
  12. Triple Coupon Collector's Problem

    I've been looking around for solutions to a certain variation of the Coupon Collector's Problem, but I haven't been able to find anything (and I'm...

    Started by Eyks‎, 11-11-2014 01:23 AM
    • Replies: 1
    • Views: 127
    11-11-2014, 03:29 AM Go to last post
  13. 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: 211
    11-10-2014, 01:08 PM Go to last post
  14. I am not sure how to solve for a probability when N is not given (beginner help).

    
I am having the most trouble with part "a)" but I am comparing the two answers so if you feel inclined to discuss part "b)" as well, I would...

    Started by annaml‎, 11-10-2014 12:02 PM
    • Replies: 6
    • Views: 179
    11-10-2014, 12:31 PM Go to last post
  15. 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: 6
    • Views: 207
    11-10-2014, 01:10 AM Go to last post
  16. Cumulative Distribution

    Can anyone explain how to do this problem: Let X be a random variable uniformly distributed in the interval (0, 1). Find the cumulative distribution...

    Started by panda‎, 11-09-2014 05:45 PM
    • Replies: 2
    • Views: 150
    11-09-2014, 06:25 PM Go to last post
  17. Poisson Distribution

    I figured out that this is Poisson distribution with a parameter λ >0 P(X = k) = ((λ^k)/k!)e^−λ , k = 0, 1, . . . , And now I want to show that...

    Started by panda‎, 11-08-2014 10:27 PM
    • Replies: 3
    • Views: 174
    11-09-2014, 05:42 PM Go to last post
  18. Independent Variables and Distribution

    I am having a lot of trouble starting this problem. Can anyone explain the process in doing this problem. Thank you for any help in advance. ...

    Started by panda‎, 11-08-2014 10:29 PM
    • Replies: 1
    • Views: 170
    11-09-2014, 09:24 AM Go to last post
  19. The probability of seeing 13 minutes past the hour at least once every day?

    Each day, there are 24 opportunities in a 24 hour period to see 13 minutes past the hour. There are 60 x 24 possible times that can be reported in...

    Started by Petros‎, 10-30-2014 10:35 AM
    2 Pages
    1 2
    • Replies: 28
    • Views: 960
    11-08-2014, 03:40 PM Go to last post
  20. Beginning and end of rainy season. How to?

    Hi all, This is a beginner's question, I apologize for that. I have taken Descriptive Statistics and I am on my why to Probability and later...

    Started by yaraeovento‎, 11-08-2014 11:08 AM
    beginner, seasonal, seasonality
    • Replies: 2
    • Views: 157
    11-08-2014, 12:54 PM Go to last post
  21. How to calculate if a mean is above chance level

    Dear all, I have a problem to compare means from two groups with chance level. The Variable I want to compare against chance level is calculated...

    Started by knut‎, 11-07-2014 05:58 AM
    chance level
    • Replies: 2
    • Views: 147
    11-07-2014, 09:03 AM Go to last post
  22. 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: 137
    11-06-2014, 04:59 AM Go to last post
  23. Someone Please Help!-Struggling Grad Student

    Can ANYONE please help me solve this problem, especially part D? (Or let me know I'm going in the right direction??). The tutors at my school are...

    Started by eheart‎, 11-04-2014 09:48 PM
    • Replies: 1
    • Views: 206
    11-04-2014, 11:11 PM Go to last post
  24. Assistance Please

    I'm having a tough time with my online stat course. Very limited feedback from instructor and I feel somewhat on my own. Can someone assist with...

    Started by amanda145‎, 11-04-2014 10:26 AM
    homework
    • Replies: 1
    • Views: 160
    11-04-2014, 12:56 PM Go to last post
  25. Question finding Confidence interval without CLT

    Hi all, I searched the posts and I did not get what I wanted. so here is the question: In our Hw we are given daily sales of pastries and coffee...

    Started by Faudis8‎, 11-04-2014 10:39 AM
    central limit theorem, confidence interval
    • Replies: 1
    • Views: 151
    11-04-2014, 11:40 AM Go to last post
  26. Backpropagated Probabilities

    To All: First, I am not sure if backproagation is the right way to define what I am looking at, but it appears to at least take the smallest...

    Started by bvw1987‎, 11-03-2014 09:38 PM
    • Replies: 2
    • Views: 159
    11-03-2014, 10:29 PM Go to last post
  27. law of total probability - variation formal names?

    Hello, there are different variations of the law of total probability. For example, the probability of 3 discreet events all occurring is: A1 *...

    Started by random512‎, 09-28-2014 05:59 PM
    • Replies: 1
    • Views: 228
    11-01-2014, 06:53 PM Go to last post
  28. How to find mean and variation from information given?

    I am very lost, my teacher gives us a bunch of notes that make absolutely no sense to me. This is the question im stuck on: -- 41% of adults have...

    Started by GrimGorilla‎, 10-30-2014 03:28 PM
    • Replies: 4
    • Views: 189
    10-30-2014, 04:33 PM Go to last post
  29. Probability of survey item-responses when participants could choose multiple items

    Hi there, I am trying to reanalyze some data from published research. My question is: how do you compare 2 proportions of responses, drawn...

    Started by g4eva‎, 10-30-2014 03:53 PM
    • Replies: 0
    • Views: 161
    10-30-2014, 03:53 PM Go to last post
  30. Implications of Joint Independence

    Hi, I have a question regarding the implications of joint independence. There are 3 random variables U,V and Z. (U,V) have a bivariate normal...

    Started by michinerd‎, 10-30-2014 12:35 PM
    conditional independence, joint independence
    • Replies: 1
    • Views: 148
    10-30-2014, 01:07 PM Go to last post
  31. Combinatorics / Conditional Independence problems

    Every year, 6 Irish families, represented by 4 members each, meet up and rent 3 minivans of 8 seats each to go to a big festival. In order to mix...

    Started by thevariance‎, 10-30-2014 03:14 AM
    combinatorics, conditional independence, inclusion-exclusion
    • Replies: 0
    • Views: 261
    10-30-2014, 03:14 AM Go to last post
  32. Normalized histograms show the same mean. Is this correct?

    I have to compare the features of histograms. All the histogram are normalized and with same number of bins. This results in the same mean value for...

    Started by DivyaSV‎, 10-29-2014 07:44 PM
    histogram comparison, normalized histograms
    • Replies: 1
    • Views: 143
    10-29-2014, 11:35 PM Go to last post
  33. Exclamation conditional independence

    hello, I would like to ask the following: I have 3 random variables X , Y and Z. If I know that X is independent of Y given Z then does this...

    Started by michinerd‎, 10-29-2014 01:38 PM
    conditional, conditional independence, independance, probability
    • Replies: 3
    • Views: 177
    10-29-2014, 03:57 PM Go to last post
  34. An event and its complement

    My wife was overdue clearing customs so I thought the probability of her showing up any minute was increasing. But then I thought, suppose -there...

    Started by Outlier‎, 10-23-2014 09:27 PM
    complement, event
    • Replies: 6
    • Views: 314
    10-28-2014, 04:22 PM Go to last post
  35. bizarre distributions

    Perhaps some expert here can shine some light on the strange results I've been experiencing lately. I wanted to explore the idea of creating a...

    Started by ArtK‎, 10-28-2014 09:59 AM
    • Replies: 0
    • Views: 166
    10-28-2014, 09:59 AM Go to last post
  36. The Probabiliy of Making it

    I have 1,2,3,4,5,6,7,8,9,10,11,12 teams. Only 8/12 teams make it to the playoffs. What is the probability that 3,4,5,8,9,10 are part of the 8 teams...

    Started by whosphil‎, 10-21-2014 08:21 PM
    combinations, probability
    • Replies: 3
    • Views: 285
    10-23-2014, 02:36 AM Go to last post
  37. Question Black Swans, non-normal distributions

    I am looking for a reference to a popular science magazine article. The point of it was that in the real world we find populations that are...

    Started by jcelko‎, 10-19-2014 05:42 PM
    black swan, exponential growth, gaussian
    • Replies: 2
    • Views: 292
    10-22-2014, 09:11 PM Go to last post
  38. Stats homework help NYS

    New York Stock Exchange. Suppose that the percentage returns for a given year for all Stocks listed on the New York Stock Exchange follows a...

    Started by bonfar10‎, 10-22-2014 03:20 PM
    • Replies: 0
    • Views: 212
    10-22-2014, 03:20 PM Go to last post
  39. 600 hotdogs. homework help

    Not quite sure how to do B or C. Thanks for the help! Jake runs the concession stand for a Chicago area minor league baseball team. He knows that...

    Started by Jhawk‎, 10-21-2014 09:56 PM
    • Replies: 0
    • Views: 218
    10-21-2014, 09:56 PM Go to last post
  40. Committee Combination

    Hi. I have used the below formulation of the problem. Kindly let me know whether I am correct or wrong. Q. "A condominium management committee...

    Started by fayyazcivil‎, 10-21-2014 04:20 PM
    probability help, probability homework help, probability question
    • Replies: 0
    • Views: 146
    10-21-2014, 04:20 PM Go to last post
  41. Probability of Absolute Return

    Mean = 0.04% SD = 1.9% of a percentage rate of return recorded daily for one year on an asset. What is the probability of an absolute return on any...

    Started by crazyforyou99‎, 10-21-2014 06:36 AM
    • Replies: 0
    • Views: 161
    10-21-2014, 06:36 AM Go to last post
  42. Wink Why this Frequency Polygon is not correct?

    Hi guys! I stumbled upon this blurry question from one of my lab old exams, in statistics elective course. I will leave you to check the...

    Started by modo‎, 10-21-2014 03:40 AM
    frequency polygon
    • Replies: 0
    • Views: 139
    10-21-2014, 03:40 AM Go to last post
  43. Finding Minimum Probability

    Hi. Below is the question in my homework. I don't know whether I've to solve this using Bayes' theorem or I have to provide a general answer. ...

    Started by fayyazcivil‎, 10-20-2014 03:11 PM
    probability help, probability homework help
    • Replies: 0
    • Views: 164
    10-20-2014, 03:11 PM Go to last post
  44. 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 05:57 AM
    • Replies: 0
    • Views: 171
    10-19-2014, 05:57 AM Go to last post
  45. Closing Difference between two numbers with confidence limits.

    Company A tested its widgets and found that when they tested 10000 of them, 2010 of them failed. They tested the widgets of their competition but...

    Started by guitmusic11‎, 10-17-2014 03:26 PM
    • Replies: 0
    • Views: 225
    10-17-2014, 03:26 PM Go to last post
  46. Question Binominal Distribution (urgent)

    kindly help (or provide hints) on below question: Suppose that you pay $1024 to enter a coin tossing game. A biased coin with head probability...

    Started by lkwokchu‎, 10-12-2014 07:11 AM
    • Replies: 5
    • Views: 423
    10-16-2014, 01:48 AM Go to last post
  47. Convergence in Probability

    Hello all. I have a two statements. One says -\frac{1}{T} \sum_{t=1}^T X_t \rightarrow a in probability as T \rightarrow \infty The...

    Started by sacamantecas‎, 10-13-2014 04:42 PM
    • Replies: 2
    • Views: 286
    10-13-2014, 05:10 PM Go to last post
  48. Simple Bernoulli question

    I am sort of baffled by this. The point is to simulate how often students will be right when guessing on a multiple choice tests with 5 responses. It...

    Started by noetsi‎, 10-10-2014 05:54 PM
    • Replies: 13
    • Views: 444
    10-13-2014, 04:24 PM Go to last post
  49. Drwaing the probability distribution of the population from a sample

    Hey there, this might be a bit of an uneducated question, but I want to make sure I don't get anything wrong. I'm wondering if one can draw...

    Started by SWDave‎, 10-13-2014 05:48 AM
    • Replies: 1
    • Views: 252
    10-13-2014, 02:08 PM Go to last post
  50. Please help me start this question.

    Consider an experiment where we roll a single die once and let X represent the number of dots that appear on the top face of the die. Suppose that...

    Started by LH-‎, 10-11-2014 05:06 PM
    dice, probability, unfair
    • Replies: 8
    • Views: 643
    10-12-2014, 12:19 PM Go to last post
  51. Simple but quite confusing Problem

    Hi all, I'm solving the problems in probability but, the question below looks simple but quite confusing to me. Regarding question 2-(c), any...

    Started by sk6398‎, 10-12-2014 04:55 AM
    expected value, probability
    • Replies: 1
    • Views: 214
    10-12-2014, 11:49 AM Go to last post
  52. Negative Binomial Distribution

    Hi, Regards

    Started by aravindavvaru‎, 10-12-2014 09:54 AM
    binomial, geometric distributions
    • Replies: 0
    • Views: 200
    10-12-2014, 09:54 AM Go to last post
  53. Please help me in these questions

    I have these problem can you help me

    Started by nmsm‎, 10-10-2014 01:53 AM
    • Replies: 2
    • Views: 227
    10-10-2014, 04:37 PM Go to last post
  54. Probability theory: The Quantum Measurement Problem

    There is a famous double-slit experiment in Quantum Mechanics that attempted to measure whether electrons and photons are comprised of particles or...

    Started by Michaelamcshane‎, 10-09-2014 11:24 AM
    probability question, quantum measurement, wave interference
    • Replies: 2
    • Views: 271
    10-10-2014, 09:29 AM Go to last post
  55. probability question

    Five cards are dealt at random and without replacement from a standard deck of 52 cards. What is the probability that the hand contains all 4 aces if...

    Started by LIPI‎, 10-09-2014 03:09 PM
    • Replies: 0
    • Views: 195
    10-09-2014, 03:09 PM Go to last post
  56. Difference of expectations of RV's given arbtrary pdfs

    I've been beating my head on this for a while... Let X and Y have pdf's f & g respectively such that \begin{cases} f(x) >= g(x) & \mbox{if } x...

    Started by frito898‎, 10-08-2014 06:23 PM
    • Replies: 1
    • Views: 223
    10-09-2014, 05:23 AM Go to last post
  57. Chi square test: how to solve this one ?

    A dentist observed that most of the patients have cavities in their teeths at the right-side of their mouth. (see data: observed values) The...

    Started by IntoTheLibrary‎, 09-16-2014 09:59 AM
    • Replies: 1
    • Views: 281
    10-08-2014, 11:14 AM Go to last post
  58. Probability that X restaurants will be visited if Y people choose independently

    I am trying to determine for Y people selecting from X restaurants (with an equal probability) what the expected value of the number of restaurants...

    Started by JPC‎, 10-07-2014 05:53 PM
    expected value, probability help
    • Replies: 2
    • Views: 189
    10-08-2014, 08:37 AM Go to last post
  59. Prob: Normal probability distribution

    The mean cost of domestic airfares in the United States rose to an all-time high of $385 per ticket (Bureau of Transportation Statistics website,...

    Started by kp2‎, 10-07-2014 08:12 PM
    • Replies: 1
    • Views: 934
    10-07-2014, 08:39 PM Go to last post
  60. two normal distributions

    the post no longer relevant - outdated

    Started by random variable‎, 10-06-2014 07:17 PM
    • Replies: 0
    • Views: 241
    10-06-2014, 07:17 PM Go to last post

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