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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: 31,138
    09-30-2005, 09:44 AM Go to last post
  1. 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: 3,949
    12-09-2010, 12:08 PM Go to last post
  2. 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: 4,435
    12-09-2010, 11:41 AM Go to last post
  3. 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: 20,101
    12-09-2010, 10:41 AM Go to last post
  4. 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: 3,390
    12-09-2010, 02:04 AM Go to last post
  5. 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: 4,234
    12-08-2010, 11:59 PM Go to last post
  6. 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: 3,525
    12-08-2010, 11:23 AM Go to last post
  7. 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: 6,272
    12-08-2010, 10:26 AM Go to last post
  8. 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: 3,455
    12-07-2010, 09:06 PM Go to last post
  9. 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: 2,607
    12-07-2010, 06:11 PM Go to last post
  10. 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: 3,986
    12-07-2010, 06:08 PM Go to last post
  11. 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: 5,708
    12-07-2010, 11:26 AM Go to last post
  12. Expanding MFGs as a power series......

    Hey, I'm having trouble working this one out. Any help would be appreciated. I had to find the Moment Generating Function of a chi-squared...

    Started by MrBojangles‎, 12-07-2010 06:46 AM
    • Replies: 1
    • Views: 4,072
    12-07-2010, 10:28 AM Go to last post
  13. probability

    hello all question: a team of biologist has been studying the children's fishing pond. let x represent the length of a single tilapia taken at...

    Started by timwestwood‎, 12-07-2010 12:08 AM
    • Replies: 0
    • Views: 1,878
    12-07-2010, 12:08 AM Go to last post
  14. question about independent variables

    Hi, all So, my daughter just came to me with a homework problem. She already has the answer from the back of the book, but doesn't understand...

    Started by mzimmers‎, 12-06-2010 10:11 PM
    • Replies: 8
    • Views: 3,154
    12-06-2010, 11:14 PM Go to last post
  15. Transformations....again!

    Let X, Y ~ Uniform(0,1). Define the PDF of i) X - Y ii) X/Y I know this problem can be solved by creating a picture and looking at the areas....

    Started by jamesmartinn‎, 10-11-2010 01:50 PM
    • Replies: 4
    • Views: 5,362
    12-06-2010, 10:57 PM Go to last post
  16. Exclamation P. distribution for Finan. Mkts

    Dear All, 1st of all, thanks for making this forum so interesting. I'm trying to find a prob. distrib. for financial mkts (like the stock...

    Started by camera.brera@gmail.com‎, 12-05-2010 03:48 PM
    • Replies: 4
    • Views: 4,147
    12-06-2010, 04:41 PM Go to last post
  17. Moment Generate function

    Suppose we were to play a game with the following rules. We pay seven dollars to play the game. We then flip a (possibly biased, probability of heads...

    Started by thenumber5‎, 12-06-2010 03:18 PM
    • Replies: 5
    • Views: 4,911
    12-06-2010, 04:27 PM Go to last post
  18. Smile Moment generating function

    I have a random variable V with density function: f(v) = (2/3)v, for 1<=v<=2 what is the moment generating function? My answer came out to...

    Started by thenumber5‎, 12-06-2010 03:03 PM
    • Replies: 2
    • Views: 4,290
    12-06-2010, 03:21 PM Go to last post
  19. Bivariate Normal problem

    PSAT scores: mean = 1200, SD = 100 (Let Random Variable = X) SAT scores: mean = 1300, SD = 90 (Let Random Variable = Y) Correlation p = .6 ...

    Started by StatStudent3‎, 12-06-2010 10:32 AM
    • Replies: 0
    • Views: 3,061
    12-06-2010, 10:32 AM Go to last post
  20. Credit Card Probability

    Last year 75% of Kmart Department Stores credit card purchases were for less than $150. In a random sample of 200 credit card companies, what is the...

    Started by TI30‎, 12-05-2010 01:54 PM
    • Replies: 2
    • Views: 4,786
    12-05-2010, 08:03 PM Go to last post
  21. y follows a Poisson distribution with rate lambda*x

    Assume that the number of faults in the roll, say y, follows a Poisson distribution with rate lambda*x, where x is the length of the roll. Does this...

    Started by zzzc‎, 11-10-2010 03:07 PM
    • Replies: 4
    • Views: 6,675
    12-05-2010, 05:27 PM Go to last post
  22. Normal Distrubtion question

    Hi, I have this question that I can not figure out: Suppose that in an apartment building run by the Probandstat rental company, the inhabitants's...

    Started by DeerPark‎, 12-04-2010 02:52 PM
    • Replies: 1
    • Views: 3,995
    12-04-2010, 04:17 PM Go to last post
  23. Help with a hw question

    I am taking my first probability course and need some help. I am working on some homework. The question I am on now asks... Consider...

    Started by donkey‎, 12-01-2010 07:29 PM
    • Replies: 5
    • Views: 5,519
    12-04-2010, 12:51 PM Go to last post
  24. Tricky question

    I have 9 balls in a bag numbered from 1 to 9. I take 1 ball and I guess its number before looking it. I put it on the side (extraction WITHOUT...

    Started by nellykelly‎, 12-03-2010 06:07 PM
    • Replies: 1
    • Views: 2,674
    12-04-2010, 03:55 AM Go to last post
  25. probability of a random sample without replacement

    I'm having problems on how to approach the following question: Suppose that we have a very large collection of marbles, 30% of which are red, 20%...

    Started by thenumber5‎, 12-03-2010 05:36 PM
    • Replies: 1
    • Views: 4,769
    12-03-2010, 06:28 PM Go to last post
  26. Expanded Deck of Card Question

    I have been given a question by my work. It feels like a doozy to me, but hopefully it's easier than I assume. Any help with equations would be...

    Started by Jared101‎, 12-03-2010 03:26 PM
    • Replies: 1
    • Views: 3,665
    12-03-2010, 06:14 PM Go to last post
  27. Uniform distribution on a triangle

    Hi All! So happy to find this site! If (x,y) is the value of the random vector (X,Y) and is uniformly distributed over the triangle with vertices...

    Started by ladyluck‎, 12-01-2010 07:50 PM
    • Replies: 10
    • Views: 12,559
    12-03-2010, 03:38 PM Go to last post
  28. Reading z-tables when you know the probability

    I'm having trouble reading z tables. If anyone can help I'd be thankful as I feel I can't move on until I know how to do this. One of the...

    Started by LiquidMoon‎, 11-18-2010 02:06 PM
    • Replies: 2
    • Views: 6,221
    12-03-2010, 10:40 AM Go to last post
  29. Help with simple probabilities problem?

    Hi guys, I'm having trouble finding a satisfactory answer to this one: what is the probability that, in a group of 7 people, you will find the...

    Started by wildetudor‎, 12-02-2010 07:08 PM
    • Replies: 3
    • Views: 3,994
    12-03-2010, 09:09 AM Go to last post
  30. Question distribution of stderr from distribution of variance?

    I'm trying to duplicate a macroeconomic paper that uses MCMC analysis to derive time series and parameter values. The authors of the original paper...

    Started by jefflovejapan‎, 12-02-2010 10:43 PM
    • Replies: 0
    • Views: 3,606
    12-02-2010, 10:43 PM Go to last post
  31. Simple Probability Question

    Hi. I have a simple probability question: Not counting the greens, what are the odds of getting 19 of the same color in a row in roulette? ...

    Started by cmarkos111‎, 12-01-2010 06:21 PM
    • Replies: 7
    • Views: 3,618
    12-02-2010, 12:44 PM Go to last post
  32. Expected Value question.

    Suppose that X, given Y = y, is distributed Gamma(α, y) and that the marginal distribution of Y is given by 1/Y~ Exponential(λ). Determine E(X). ...

    Started by c2q‎, 12-01-2010 10:15 PM
    • Replies: 2
    • Views: 3,724
    12-02-2010, 11:13 AM Go to last post
  33. Exclamation A question on exponential distributions

    from an exponential distribution with expected value 0.2, if i get the mean of 20 observations, then repeat (get another 20) , etc, so in total 1000...

    Started by omega‎, 12-01-2010 07:25 PM
    • Replies: 0
    • Views: 2,173
    12-01-2010, 07:25 PM Go to last post
  34. m&m probability

    Hi can you look over my solution? I am having difficulty in C and D part(what do they mean by procedure?) Thanks :yup: 1) According to company...

    Started by SadieKhan‎, 11-30-2010 02:46 PM
    • Replies: 1
    • Views: 6,333
    12-01-2010, 01:23 AM Go to last post
  35. Uniform Distn, Power Function

    Let X1 , ... , Xn ∼ Uniform(0, θ) and let Y = max{X1 , ... , Xn }. We want to test H0 : θ = 1/2 versus H1 : θ > 1/2. Suppose we decide to test...

    Started by jamesmartinn‎, 11-30-2010 07:09 PM
    • Replies: 0
    • Views: 6,981
    11-30-2010, 07:09 PM Go to last post
  36. Finding pdf of Quotient

    Let X ~ Uniform(0, 1) and Y ~ Exponential(1) be independent. Find pdf of X/Y For Y/X case, I understand that the pdf of this is integral of...

    Started by StatStudent3‎, 11-29-2010 08:58 PM
    • Replies: 5
    • Views: 3,218
    11-30-2010, 05:04 PM Go to last post
  37. Conditional probability of an event that never occurred

    Hi folks, I'm facing a problem right now...given three events A, B and C, is it possible to estimate the occurrence of events A and C together...

    Started by keyser3‎, 11-24-2010 07:47 AM
    • Replies: 1
    • Views: 1,977
    11-30-2010, 12:22 PM Go to last post
  38. Need a formula for a one of these gamma densities

    For the integral from for x^(s-1) * e^(-lambda * x) You have s and lambda, so is the final answer for this (s-1)! / lambda^(s) ? Or is it (s-1)!...

    Started by StatStudent3‎, 11-29-2010 10:10 PM
    • Replies: 5
    • Views: 4,027
    11-30-2010, 12:26 AM Go to last post
  39. Exclamation help with exponential distribution

    X1,X2,...,XN are independently identically exponentially distributed with expected value of 5. How can I compute Xn when n=20 and N=1000? Then...

    Started by omega‎, 11-29-2010 07:33 PM
    • Replies: 7
    • Views: 6,546
    11-30-2010, 12:13 AM Go to last post
  40. Simple marginal effects after probit

    So I have cannot find pretty much any basic information on marginal effects after probit in STATA on the net or my textbooks, so any help would be...

    Started by sif‎, 11-29-2010 08:39 PM
    • Replies: 0
    • Views: 6,073
    11-29-2010, 08:39 PM Go to last post
  41. Pooled Variance Distribution

    Hi, I hope I am posting this in the correct forum. I have two populations and I've been taking samples from each population and calculating the...

    Started by fcc‎, 11-29-2010 01:49 PM
    • Replies: 3
    • Views: 8,358
    11-29-2010, 07:59 PM Go to last post
  42. Probability rank-n

    Hello Let y1,..yn be drawn from a normal distribution width known parameters. Let x be drawn from another normal distribution with known...

    Started by hugomcp‎, 11-29-2010 12:51 PM
    • Replies: 0
    • Views: 2,316
    11-29-2010, 12:51 PM Go to last post
  43. i am having trouble with a stats question

    What do you think is the most common nonobstetric (not related to pregnancy) reason for hospitalization among 18-44 American women? According to the...

    Started by Britneymill55‎, 11-28-2010 10:09 PM
    • Replies: 1
    • Views: 2,980
    11-28-2010, 10:37 PM Go to last post
  44. What does this distribution mean?

    When it says: the marginal distribution of Y is given by 1/Y ~ Exponential(lamda) does that mean the distribution is written has: ...

    Started by c2q‎, 11-26-2010 06:55 PM
    • Replies: 4
    • Views: 3,334
    11-28-2010, 05:52 PM Go to last post
  45. Expected value of second highest draw

    Hello all, Suppose I take two draws from a uniform distribution on . I know that the value of the highest draw is equal to x. What then is the...

    Started by Salohcin‎, 11-28-2010 01:33 PM
    • Replies: 1
    • Views: 5,852
    11-28-2010, 02:01 PM Go to last post
  46. Properties of discrete random variables

    Hello, would some one with more experience mind to confirm or correct me: For discrete random variables I know: E = aE+b and...

    Started by jocali‎, 11-23-2010 08:05 PM
    • Replies: 4
    • Views: 7,710
    11-28-2010, 12:37 PM Go to last post
  47. Probability that bus arrives to station ?

    Hello! I have a problem.... A bus arives to station 07.15 but is often late. Uniform distribution! Bus is late between 0 and 7 minutes! a a)...

    Started by piton41‎, 11-26-2010 06:35 AM
    • Replies: 1
    • Views: 3,596
    11-26-2010, 10:44 PM Go to last post
  48. Question help convergence in distribution

    If there is b1,b2,b3...bi a sequence with non negative real numbers, and the sum of them is 1. Also P(X=i)=bi for all positive integer i. How do I...

    Started by omega‎, 11-26-2010 12:30 PM
    • Replies: 0
    • Views: 2,060
    11-26-2010, 12:30 PM Go to last post
  49. a doctor promises a 90% chance of a cure for your illness

    for $1000. For him to share the risk equally with you how much money should he put in escrow for you? Suppose you want him to share half the...

    Started by Outlier‎, 11-24-2010 08:49 PM
    • Replies: 2
    • Views: 2,868
    11-26-2010, 10:06 AM Go to last post
  50. Problem with bayesian updating example

    Hi everybody, I have an example in bayesian statistics which I've worked on for some hours now, without significant success. The problem is the...

    Started by Bayesianski‎, 11-24-2010 09:57 AM
    • Replies: 2
    • Views: 4,588
    11-26-2010, 01:43 AM Go to last post
  51. help with chi square freedom sums

    How do i show that the a + is a ? How can i use moment generating functions to do this?

    Started by omega‎, 11-25-2010 02:43 PM
    • Replies: 5
    • Views: 5,418
    11-25-2010, 10:12 PM Go to last post
  52. how to get probability from a normal distribution?

    If I had Z=Y^3 where Y is a standard normal distribution. How would I approx. calculate the probability of Z<=1 ?, I would understand it if it was...

    Started by omega‎, 11-25-2010 01:52 PM
    • Replies: 4
    • Views: 4,850
    11-25-2010, 09:18 PM Go to last post
  53. how to understand if difference between two freq is significant

    Hi, I need a suggest, I am not a statistician. I have an observed frequency distribution. A - 47.7 B - 51.9 C - 0.4 The sample is N=1626.

    Started by vs.arni‎, 11-25-2010 11:06 AM
    • Replies: 2
    • Views: 2,425
    11-25-2010, 12:24 PM Go to last post
  54. Unhappy probability

    I am new to stats and have an assignment due in two days. I can only explain it by writing out the problem. Not sure how to begin solving. The...

    Started by browncl67‎, 11-25-2010 11:30 AM
    • Replies: 0
    • Views: 2,171
    11-25-2010, 11:30 AM Go to last post
  55. I have questions ??

    Hi I have 3 questions. Let x1, . . . , xn be independent observations of a chi-square(k) random variable, with p.d.f. f(x)= 1/(2^k/Γ(k/2)) ...

    Started by Dodi‎, 11-24-2010 07:47 PM
    • Replies: 1
    • Views: 4,600
    11-25-2010, 03:08 AM Go to last post
  56. MGF Standard Normal to Normal

    Hi, I'm just doing some review problems and I've found the MGF of a standard normal random variable, X ~ N(0,1). After some tedious algebra, I...

    Started by jamesmartinn‎, 11-24-2010 08:13 PM
    • Replies: 3
    • Views: 5,927
    11-25-2010, 12:40 AM Go to last post
  57. Exclamation question on convergence of probability

    Show that Xn->0 (in probability) iff |Xn|->0 (in probability). What i have so far |Xn|->0 (in probability) iff for any ε>0 P(||Xn|-ε|>=0)->0 as...

    Started by omega‎, 11-24-2010 04:42 PM
    • Replies: 0
    • Views: 2,208
    11-24-2010, 04:42 PM Go to last post
  58. Probability

    Hi all, i'm preparing for an exam and I'm having difficulty interpreting this problem, nevermind solving it. What I'd like is for someone to sort of...

    Started by jamesmartinn‎, 11-24-2010 08:40 AM
    • Replies: 3
    • Views: 2,658
    11-24-2010, 02:57 PM Go to last post
  59. How to get this number?

    a) Variant P(x=0)=P(0,0)+P(0,1)+P(0,2)=0.27 P(x=1)=P(1,0)+P(1,1)+P(1,2)=0,4 P(x=2)=P(2,0)+P(2,1)+P(2,2)=0.33 expected value ( I do not know how...

    Started by Aauusteja‎, 11-22-2010 10:51 AM
    • Replies: 13
    • Views: 3,785
    11-24-2010, 12:16 PM Go to last post
  60. Arrow help with convergence in probability

    If Xn->X (in probability) and Yn->Y(in probability) and Cn=Xn+Yn and C=X+Y show that Cn->C (in probability). what i got so far |Xn-X|<=ε/2 and...

    Started by omega‎, 11-23-2010 09:52 PM
    • Replies: 1
    • Views: 2,757
    11-24-2010, 01:20 AM Go to last post

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