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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: 31,161
    09-30-2005, 09:44 AM Go to last post
  1. 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: 2,295
    12-06-2014, 10:46 AM Go to last post
  2. 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: 1,710
    12-06-2014, 10:46 AM Go to last post
  3. 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: 2,418
    12-06-2014, 04:18 AM Go to last post
  4. 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: 1,679
    12-05-2014, 05:24 PM Go to last post
  5. 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: 1,237
    12-05-2014, 04:09 PM Go to last post
  6. 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: 2,111
    12-05-2014, 03:04 PM Go to last post
  7. 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: 1,383
    12-05-2014, 08:09 AM Go to last post
  8. 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: 11
    • Views: 3,632
    12-02-2014, 10:24 AM Go to last post
  9. 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: 1,936
    12-01-2014, 10:12 AM Go to last post
  10. 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: 1,291
    11-30-2014, 11:48 PM Go to last post
  11. 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: 1,470
    11-30-2014, 08:00 AM Go to last post
  12. 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: 2,401
    11-28-2014, 06:26 PM Go to last post
  13. 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: 1,699
    11-25-2014, 04:35 PM Go to last post
  14. 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: 4,532
    11-24-2014, 02:46 PM Go to last post
  15. 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: 3,451
    11-24-2014, 01:55 AM Go to last post
  16. 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: 2,416
    11-23-2014, 05:19 PM Go to last post
  17. 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: 2,336
    11-22-2014, 04:56 PM Go to last post
  18. 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: 1,084
    11-22-2014, 09:58 AM Go to last post
  19. 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: 1,514
    11-20-2014, 11:03 PM Go to last post
  20. 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: 1,951
    11-15-2014, 07:12 PM Go to last post
  21. 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: 1,710
    11-14-2014, 05:32 PM Go to last post
  22. 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: 1,304
    11-13-2014, 04:27 AM Go to last post
  23. Calculating probability of at least/exactly X when rolling 2 n-sided dice

    Hi, Psychology student struggling with probabilities here. Can anyone please tell me how do I calculate: 1) The probability of getting at...

    Started by replica‎, 11-12-2014 07:30 PM
    • Replies: 0
    • Views: 1,295
    11-12-2014, 07:30 PM Go to last post
  24. 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: 1,125
    11-12-2014, 10:07 AM Go to last post
  25. "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: 1,945
    11-12-2014, 05:37 AM Go to last post
  26. 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: 1,399
    11-12-2014, 02:10 AM Go to last post
  27. 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: 1,496
    11-11-2014, 03:29 AM Go to last post
  28. 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: 2,084
    11-10-2014, 01:08 PM Go to last post
  29. 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: 1,256
    11-10-2014, 12:31 PM Go to last post
  30. 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: 1,796
    11-09-2014, 06:25 PM Go to last post
  31. 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: 2,644
    11-09-2014, 05:42 PM Go to last post
  32. 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: 1,325
    11-09-2014, 09:24 AM Go to last post
  33. 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 09:35 AM
    2 Pages
    1 2
    • Replies: 28
    • Views: 8,462
    11-08-2014, 03:40 PM Go to last post
  34. 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: 1,527
    11-08-2014, 12:54 PM Go to last post
  35. 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: 6,554
    11-07-2014, 09:03 AM 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: 1,647
    11-06-2014, 04:59 AM Go to last post
  37. 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: 3,157
    11-04-2014, 11:11 PM Go to last post
  38. 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: 1,356
    11-04-2014, 12:56 PM Go to last post
  39. 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: 1,243
    11-04-2014, 11:40 AM Go to last post
  40. 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: 1,185
    11-03-2014, 10:29 PM Go to last post
  41. 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 04:59 PM
    • Replies: 1
    • Views: 1,732
    11-01-2014, 05:53 PM Go to last post
  42. 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 02:28 PM
    • Replies: 4
    • Views: 5,507
    10-30-2014, 03:33 PM Go to last post
  43. 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 02:53 PM
    • Replies: 0
    • Views: 1,177
    10-30-2014, 02:53 PM Go to last post
  44. 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 11:35 AM
    conditional independence, joint independence
    • Replies: 1
    • Views: 1,610
    10-30-2014, 12:07 PM Go to last post
  45. 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 02:14 AM
    combinatorics, conditional independence, inclusion-exclusion
    • Replies: 0
    • Views: 1,414
    10-30-2014, 02:14 AM Go to last post
  46. 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 06:44 PM
    histogram comparison, normalized histograms
    • Replies: 1
    • Views: 1,007
    10-29-2014, 10:35 PM Go to last post
  47. 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 12:38 PM
    conditional, conditional independence, independance, probability
    • Replies: 3
    • Views: 1,585
    10-29-2014, 02:57 PM Go to last post
  48. 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 08:27 PM
    complement, event
    • Replies: 6
    • Views: 1,968
    10-28-2014, 03:22 PM Go to last post
  49. 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 08:59 AM
    • Replies: 0
    • Views: 1,358
    10-28-2014, 08:59 AM Go to last post
  50. 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 07:21 PM
    combinations, probability
    • Replies: 3
    • Views: 1,364
    10-23-2014, 01:36 AM Go to last post
  51. 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 04:42 PM
    black swan, exponential growth, gaussian
    • Replies: 2
    • Views: 1,423
    10-22-2014, 08:11 PM Go to last post
  52. 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 02:20 PM
    • Replies: 0
    • Views: 1,331
    10-22-2014, 02:20 PM Go to last post
  53. 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 08:56 PM
    • Replies: 0
    • Views: 1,516
    10-21-2014, 08:56 PM Go to last post
  54. 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 03:20 PM
    probability help, probability homework help, probability question
    • Replies: 0
    • Views: 2,247
    10-21-2014, 03:20 PM Go to last post
  55. 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 05:36 AM
    • Replies: 0
    • Views: 1,500
    10-21-2014, 05:36 AM Go to last post
  56. 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 02:40 AM
    frequency polygon
    • Replies: 0
    • Views: 981
    10-21-2014, 02:40 AM Go to last post
  57. 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 02:11 PM
    probability help, probability homework help
    • Replies: 0
    • Views: 1,468
    10-20-2014, 02:11 PM Go to last post
  58. 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: 2,736
    10-19-2014, 04:57 AM Go to last post
  59. 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 02:26 PM
    • Replies: 0
    • Views: 1,128
    10-17-2014, 02:26 PM Go to last post
  60. 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 06:11 AM
    • Replies: 5
    • Views: 2,519
    10-16-2014, 12:48 AM Go to last post

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