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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: 30,304
    09-30-2005, 09:44 AM Go to last post
  1. Comparing the skewness of two smaple distributions

    Hi Everyone, I wonder if anyone can help me here. Suppose I have two samples with, say, 100 observations in each, and I am not sure if the...

    Started by BigBugBuzz‎, 11-26-2010 06:53 AM
    • Replies: 1
    • Views: 3,758
    01-04-2011, 10:05 AM Go to last post
  2. On estimating an underlying probability distribution

    Dear Forum readers! Every now and then our university makes a poll among the students, asking questions like "How good was the lecture" to which...

    Started by hanspi‎, 01-03-2011 08:35 AM
    • Replies: 2
    • Views: 4,764
    01-04-2011, 10:00 AM Go to last post
  3. Show Skewness of a symmetric pdf to be 0

    Hi there, I am hoping some of you may be able to help/guide me! I am taking a course in turbulence which has an obvious background in statistical...

    Started by positively_skewed_up‎, 01-03-2011 03:35 PM
    • Replies: 1
    • Views: 14,134
    01-03-2011, 04:58 PM Go to last post
  4. Please can you check my answers

    Q1) A Newspaper dealer sells 1 newspaper every 6 mins on average. You can assume it follows a Poisson Distribution. a) Whats the probability that...

    Started by zkm1223‎, 12-27-2010 08:06 AM
    2 Pages
    1 2
    • Replies: 27
    • Views: 12,481
    01-03-2011, 11:10 AM Go to last post
  5. Help with draw of random numbers

    Hi I would like some help with the formula to work out the following problem. If you have the numbers 1-80 and you draw 20 unique numbers from the 80...

    Started by Peeledseal‎, 01-02-2011 04:57 AM
    • Replies: 3
    • Views: 5,157
    01-03-2011, 10:58 AM Go to last post
  6. Question Distribution function inequality

    Prove that 1-\sum_{i=1}^{n}\leq F(x_1,x_2,....,x_n) where F(x_1,x_2,...,x_n) is the joint cdf and F_i(x_i) is the cdf of X_i

    Started by Sambit‎, 01-01-2011 08:15 AM
    • Replies: 0
    • Views: 2,842
    01-01-2011, 08:15 AM Go to last post
  7. National Lottery

    Consider these two scenarios and decide which is *better* (better is purposely ambiguous here…). 1. Have one punt at the lottery and purchase 52...

    Started by TheDuck‎, 12-31-2010 03:04 AM
    • Replies: 4
    • Views: 3,611
    12-31-2010, 02:15 PM Go to last post
  8. Scrabble Question

    Okay, so at the beginning of a scrabble game, before anyone plays any words, everyone draws their 7 letters from the bag. Is there any statistical...

    Started by kalestilez@gmail.com‎, 12-31-2010 03:49 AM
    • Replies: 3
    • Views: 2,993
    12-31-2010, 12:55 PM Go to last post
  9. RV distribution with hint

    Let x be a RV that counts the number of clients that enter some place. It is initialized to 0 at time 0. The number of clients that enter per second...

    Started by yossigi‎, 12-29-2010 09:19 AM
    • Replies: 4
    • Views: 4,268
    12-30-2010, 03:55 PM Go to last post
  10. Random probability distribution for demand

    Hi All, I have a sample of 100 items with a specific daily expected demand probability. Average demand for a day is 4 (without repetition). I have...

    Started by sach_83‎, 12-28-2010 07:43 AM
    • Replies: 10
    • Views: 10,275
    12-29-2010, 12:22 PM Go to last post
  11. Events

    Hi Guys, I've got a couple of theoretical questions: 1. If the intersection of events A,B,C is an empty set, is it true that the intersections...

    Started by WeeG‎, 12-28-2010 05:39 AM
    • Replies: 3
    • Views: 3,928
    12-28-2010, 08:36 PM Go to last post
  12. Conditional distribution of transformed variables

    Hi, I'll appreciate if someone can help me figure out the following problem: Let \Theta,E_1,E_2 be all real-valued random variables. E_1 and E_2...

    Started by statbo‎, 12-11-2010 05:57 PM
    • Replies: 1
    • Views: 2,927
    12-25-2010, 02:04 PM Go to last post
  13. random walk

    For a simple random walk, where S_n = X_1 + X_2 + \ldots + X_n, and X_i's are i.i.d with P(X_i = 1) = P(X_i = -1) = 1/2, it's a well-known fact...

    Started by evalover1987‎, 12-24-2010 01:14 PM
    • Replies: 0
    • Views: 3,000
    12-24-2010, 01:14 PM Go to last post
  14. How to calculate probability on dice groups.

    I'm a game designer studying the probability curves of various dice throwing mechanics. I know some basic statistics but it's been a while since I...

    Started by marcsterix‎, 12-22-2010 10:24 PM
    • Replies: 6
    • Views: 8,510
    12-23-2010, 02:39 PM Go to last post
  15. Standard Deviation from Percentiles and Mean

    Hello to all and thank you in advance for the help with this. I am working with a lognormal distribution and am given Percentiles - P10, P50, P90,...

    Started by rpmc‎, 06-08-2009 05:07 AM
    • Replies: 7
    • Views: 36,356
    12-23-2010, 02:14 PM Go to last post
  16. Confusing...

    Hi,i want to ask.....(let X=sample mean) 1.what is the prob that the sample mean will be smaller then 100 or larger than 50? so my expression is:...

    Started by ho168‎, 12-21-2010 11:26 AM
    • Replies: 3
    • Views: 5,085
    12-23-2010, 06:56 AM Go to last post
  17. Help needed on probability assignment.

    Hi - A test for a disease has been used for many years. Experience with the test indicates that its sensitivity (probability that a person having...

    Started by tundradogs‎, 02-13-2009 02:01 PM
    • Replies: 2
    • Views: 6,195
    12-22-2010, 02:52 PM Go to last post
  18. Normal Distribution Help Please

    Hi, in my homework, I am stuck on a three part question. I have managed to do the first part of the question but can't understand how to do the...

    Started by zkm1223‎, 12-21-2010 11:42 AM
    • Replies: 3
    • Views: 2,473
    12-22-2010, 12:24 PM Go to last post
  19. Help combining probabilities

    I am a relative novice concerning statistics and probability, and was hoping for some assistance with this problem. I have a substantial database...

    Started by Chrishb‎, 12-22-2010 03:47 AM
    • Replies: 0
    • Views: 2,095
    12-22-2010, 03:47 AM Go to last post
  20. What are the odds?

    Hi all, So on a (e.g.) 140-question multiple choice examination, one would expect a score of about 25% if a testees' responses were random. I...

    Started by InIbra‎, 12-22-2010 02:44 AM
    • Replies: 1
    • Views: 2,118
    12-22-2010, 03:18 AM Go to last post
  21. Quartic Exponential Distribution

    Thanks in advance for any help. I am working on a model where I have the need to compute the normalization constant for the Quartic Exponential...

    Started by paullr‎, 12-21-2010 05:39 AM
    • Replies: 1
    • Views: 3,285
    12-21-2010, 04:13 PM Go to last post
  22. Conditional Expectation question

    My final is on Mon, and I got this HW problem wrong from last week, and I still don't understand why. An item is selected randomly from a...

    Started by StatStudent3‎, 12-09-2010 10:23 PM
    • Replies: 6
    • Views: 6,325
    12-21-2010, 07:11 AM Go to last post
  23. Having trouble with conditional expectation problem

    Hi all, I have been doing some self studying and have been using some course materials from the University of Auckland. I somehow have gotten...

    Started by neelamsi‎, 12-21-2010 06:33 AM
    • Replies: 0
    • Views: 2,500
    12-21-2010, 06:33 AM Go to last post
  24. Combining pdf's for when a task will stop

    Hello, I have multiple tasks I want to run in succession, and I need to know at a given time what is the probability that they will both be done....

    Started by Statler‎, 12-20-2010 04:26 PM
    • Replies: 2
    • Views: 2,099
    12-20-2010, 06:27 PM Go to last post
  25. Normal distribution problems

    I'm having some issues with a few questions on my practice final. Let X be a normally distributed random variable with expectation = -1 and...

    Started by player‎, 12-14-2010 10:37 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,636
    12-20-2010, 02:38 PM Go to last post
  26. SOA Exam-P Practice

    Anybody studying for the Society of Actuaries Exam-P? I am studying from the practice questions provided on the website. Any good study materials...

    Started by catamount‎, 12-16-2010 08:31 PM
    • Replies: 2
    • Views: 4,196
    12-17-2010, 04:58 PM Go to last post
  27. Probability problem

    Hello, I am a student and still new to statistics and have recebtly found this forum. I have this particular problem to solve and I need help: ...

    Started by invidrake‎, 12-17-2010 07:05 AM
    • Replies: 4
    • Views: 2,889
    12-17-2010, 04:24 PM Go to last post
  28. Probability for 20 people

    Hi, I'm not a stats student, I'm a university student reviewing some literature and I'm interested in some of the statistics related to it and how...

    Started by ae5‎, 12-16-2010 04:09 PM
    • Replies: 5
    • Views: 4,404
    12-16-2010, 06:55 PM Go to last post
  29. Uniform Disk Help Grovel

    Let (x,y) be uniformly distributed over x^2+y^2\leq1, the unit disk. 1. Work out an expression for E{X^mY^n} I have found that the marginal...

    Started by donkey‎, 12-15-2010 01:54 AM
    • Replies: 5
    • Views: 3,568
    12-16-2010, 02:44 PM Go to last post
  30. Process Capability - Extreme Measurements

    Hi All... I am trying to determine the process capability of a plating process (Cu thickness) where we are only able to measure the extremes. ...

    Started by Hartwa‎, 12-16-2010 12:39 PM
    • Replies: 0
    • Views: 3,006
    12-16-2010, 12:39 PM Go to last post
  31. Dice Throwing

    2 dice thrown together for 3 times, what is the probability that for any of the 3 throws, I will get the same number on both dice? Thx ! Andrew

    Started by andrewhzh1‎, 12-16-2010 08:51 AM
    • Replies: 1
    • Views: 3,367
    12-16-2010, 08:56 AM Go to last post
  32. Conditional Probability Problem

    Hello all! I have a probability test tomorrow and have been working through practice problems but I ran into one that is giving me troubles. We...

    Started by ldg21‎, 12-15-2010 06:57 PM
    • Replies: 2
    • Views: 3,568
    12-15-2010, 08:27 PM Go to last post
  33. Membership in group

    This is from the Bertsekas Intro Probability book, 1st ed. How do you approach this problem? A class has 4 grad students and 12 undergrad...

    Started by DAE‎, 12-15-2010 03:57 PM
    • Replies: 4
    • Views: 2,643
    12-15-2010, 06:39 PM Go to last post
  34. Gumbel from exponential

    I am working on generating the Gumbel distribution like so... Let X1,X2,..., Xn be iid EXP(1) Let Y=max(X1,X2,..., Xn) Let An be an n-dependent...

    Started by donkey‎, 12-14-2010 03:51 AM
    • Replies: 1
    • Views: 2,876
    12-15-2010, 01:55 AM Go to last post
  35. Probability question.

    I have two probability questions that confuse me even though they sound very easy. Can any one help? "If I decide to give a 20 question...

    Started by RKO‎, 12-13-2010 07:24 PM
    • Replies: 3
    • Views: 2,782
    12-14-2010, 09:22 PM Go to last post
  36. Geometric RV

    So i have a question... If X is a geometric RV with parameter p (the geometric definition where x=0,1,2,3...) 1. compute the distribution of...

    Started by ladyluck‎, 12-14-2010 01:04 AM
    • Replies: 5
    • Views: 6,715
    12-14-2010, 09:08 PM Go to last post
  37. How to find probability in this statistics problem?

    We have "N" experiments with YES/NO outcome and in each experiment probability for YES is "p". If in "N-1" experiments we had "m" YES outcomes,...

    Started by dicki767‎, 12-13-2010 12:05 PM
    • Replies: 4
    • Views: 3,353
    12-14-2010, 12:20 PM Go to last post
  38. probability help

    Hi I am new to statistics and have been given the following question: Suppose X~B(16, 0.75) How do I calculate E(X) and V(X)? All the...

    Started by ccs‎, 12-13-2010 01:08 PM
    • Replies: 5
    • Views: 2,541
    12-13-2010, 01:59 PM Go to last post
  39. joint pmf of 2 dependent variables

    Hi, I am having trouble calculating the joint pmf of two "not necessarily independent" RV's. The information given was that X~Bernoulli(p),...

    Started by dm20‎, 12-12-2010 10:44 PM
    • Replies: 4
    • Views: 5,325
    12-13-2010, 12:27 AM Go to last post
  40. Question question about a normal distribution probability homework

    hello everyone ; glad to be here with you :D i hope you'll help me to resolve this problem exercise : we inform you that's 84,13% of the...

    Started by Moorish‎, 12-11-2010 08:49 AM
    • Replies: 8
    • Views: 4,488
    12-12-2010, 06:14 PM Go to last post
  41. Indicated probability

    Assume that X has a normal distribution, and find the indicated probability. The mean is μ = 15.2 and the standard deviation is σ = 0.9. Find the...

    Started by Katze‎, 12-12-2010 01:58 PM
    • Replies: 1
    • Views: 7,780
    12-12-2010, 03:16 PM Go to last post
  42. Exclamation Binomial Distribution help

    Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of...

    Started by Katze‎, 12-12-2010 01:56 PM
    • Replies: 2
    • Views: 8,497
    12-12-2010, 02:03 PM Go to last post
  43. normal question

    Can someone tell me if this is right im kind of confused, thanks!! The lifetimes of interactive computer chips produced by a certain semiconductor...

    Started by emland89‎, 12-11-2010 11:28 PM
    • Replies: 1
    • Views: 4,014
    12-12-2010, 01:15 PM Go to last post
  44. Possion question

    Hey guys, i have my final next week and i been studying for it. i been doing the question in the book, but i there is a questions that i really do...

    Started by emland89‎, 12-10-2010 09:55 AM
    • Replies: 5
    • Views: 3,252
    12-10-2010, 10:13 PM Go to last post
  45. Marbles ()

    Suppose that we have a very large collection of marbles, 30% of which are red, 20% of which are green, 40% of which are blue, and 10% of which are...

    Started by DeerPark‎, 12-10-2010 01:28 PM
    • Replies: 0
    • Views: 1,989
    12-10-2010, 01:28 PM Go to last post
  46. Smile Interesting but simple probability question (Black/White Marble)

    Hey guys, Its my first time posting in these forums. The other day a professor of mine gave me this problem which i tried to do for hours but...

    Started by v10‎, 12-09-2010 04:28 PM
    • Replies: 3
    • Views: 5,369
    12-09-2010, 11:00 PM Go to last post
  47. Thumbs up Simpson's paradox question!

    Ok guys so the question goes like: A company ABC makes 2 drugs --> Drug A & Drug B Drug B has a higher success rate when given to both men and...

    Started by v10‎, 12-09-2010 04:33 PM
    • Replies: 2
    • Views: 3,439
    12-09-2010, 10:03 PM Go to last post
  48. Familywise Type II error rates

    There is a lot in the literature on familywise Type I errror rates but no explanation of familywise Type II error rates. If familywise rates remain...

    Started by mgrant8466‎, 12-09-2010 03:14 PM
    • Replies: 0
    • Views: 2,743
    12-09-2010, 03:14 PM Go to last post
  49. Probability of getting your umbrella back

    This problem took me a while to figure out. Thought I'd post it up to see if other members would get it quicker than I did. A party has n guests,...

    Started by Link‎, 12-07-2010 11:07 PM
    • Replies: 1
    • Views: 4,122
    12-09-2010, 12:08 PM Go to last post
  50. Probablity

    Hi Suppose there are 2000 capsules from Manufacturer A, 3000 capsules from Manufacturer B, and 1000 capsules from Manufacturer C. Each...

    Started by DeerPark‎, 12-08-2010 11:17 AM
    • Replies: 4
    • Views: 3,590
    12-09-2010, 12:08 PM Go to last post
  51. Random variable

    Suppose that we have a very large collection of marbles, 30% of which are red, 20% of which are green, 40% of which are blue, and 10% of which are...

    Started by DeerPark‎, 12-08-2010 12:33 PM
    • Replies: 2
    • Views: 3,957
    12-09-2010, 11:41 AM Go to last post
  52. Help with Probability!

    Hi. I came across a few questions tht i came across while studyin for a probability chapter. Just a little request, im very new to probability so u...

    Started by aisha00‎, 12-08-2010 06:02 AM
    • Replies: 5
    • Views: 19,010
    12-09-2010, 10:41 AM Go to last post
  53. Probability of measuring points

    Dear all I would like to ask a question from 'real life'. We are manufacturing pieces which will be assembled togehter for later use. between...

    Started by Thomas Ramel‎, 12-09-2010 02:04 AM
    • Replies: 0
    • Views: 3,155
    12-09-2010, 02:04 AM Go to last post
  54. Post Probability of a combination of two separate outcomes, without replacement

    All I am stumped with this one, best way to describe the problem is as follows; Suppose you have 10 red marbles, 10 blue marbles, 10 green...

    Started by Giovanni‎, 12-08-2010 04:57 PM
    • Replies: 1
    • Views: 4,033
    12-08-2010, 11:59 PM Go to last post
  55. Combination permutation

    Suppose that from a class of students (of whom 14 are male and 16 are female), a committee of 10 students is chosen at random. The committee then...

    Started by DeerPark‎, 12-08-2010 11:23 AM
    • Replies: 0
    • Views: 3,283
    12-08-2010, 11:23 AM Go to last post
  56. Two part PMF for a Joint Distribution problem

    Suppose X and Y have the following joint distribution p(x, y) = c(x^2 + y^2). For x = -1, 0, 1, 3 and y = -1, 2, 4: A) Find the value of c that...

    Started by Dantevus‎, 12-08-2010 09:12 AM
    • Replies: 2
    • Views: 5,841
    12-08-2010, 10:26 AM Go to last post
  57. please help

    1. The following data represent the pulse rates of females: Pulse Rate Frequency 60 - 69 12 70 - 79 14 80 - 89 11 90- 99 1 ...

    Started by davidmav19‎, 12-07-2010 08:40 PM
    • Replies: 3
    • Views: 3,266
    12-07-2010, 09:06 PM Go to last post
  58. Probability of the sample Mean

    The weight (x) of an adult salmon in Lake Michigan is a normally distributed variable with the mean 5.5 lbs and a standard deviation of 0.5 lbs. An...

    Started by dayday404‎, 12-07-2010 06:11 PM
    • Replies: 0
    • Views: 2,447
    12-07-2010, 06:11 PM Go to last post
  59. limiting distributions?

    A club basketball team will play a 44-game season. 26 of these games are against class A and 18 are against class B teams. Suppose that the team will...

    Started by yuki‎, 12-07-2010 06:08 PM
    • Replies: 0
    • Views: 3,777
    12-07-2010, 06:08 PM Go to last post
  60. Question about uncorrelated random variables that are not independent

    I understand that if random variables are uncorrelated, then Cov(X, Y) = 0 and Corr(X, Y) = 0 are among the 2 conditions. However, what is the...

    Started by StatStudent3‎, 12-07-2010 11:19 AM
    • Replies: 1
    • Views: 5,404
    12-07-2010, 11:26 AM Go to last post

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