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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: 30,384
    09-30-2005, 09:44 AM Go to last post
  1. Binomial probability problem

    I have a problem working out the answer to this problem using the binomial formula. Assume an airline operates a short haul flight form Edinburgh...

    Started by ap183‎, 08-04-2010 08:12 AM
    • Replies: 4
    • Views: 3,298
    08-04-2010, 10:57 AM Go to last post
  2. How to judge which probability distribution

    Please kindly find attached the histogram of my research samples. X –axis comprises values from 0 to 1, and the frequency of 0 is relatively high....

    Started by helenekuo‎, 08-09-2010 03:35 AM
    • Replies: 4
    • Views: 3,484
    08-13-2010, 12:25 AM Go to last post
  3. Clustering in SPSS

    Hi, This forum has been of great help so far. THANKS. I have another question.:p I have some 170 cases which I want to classify according...

    Started by weakatstats‎, 08-16-2010 07:32 PM
    • Replies: 4
    • Views: 3,408
    08-18-2010, 04:36 PM Go to last post
  4. Question Calculating Joint Probability

    If I have uniform random variables X and Y in the range (a,b), how can I calculate joint probability distribution function p(y,x) for y...

    Started by smohantycs‎, 08-17-2010 10:18 PM
    • Replies: 4
    • Views: 8,745
    08-19-2010, 02:11 PM Go to last post
  5. Is it possible to calculate a binomial distribution with a non-constant p?

    Here's the actual problem I'm faced with. Suppose a segment of dna with 100 mutations (SNPs) which occur at different frequencies from each other and...

    Started by jonnybgood‎, 08-25-2010 11:05 AM
    • Replies: 4
    • Views: 4,515
    08-26-2010, 12:04 AM Go to last post
  6. My probability practise

    Hi, I am just trying to improve my probability concepts.. I came across this question.. Just let me know if I am correct? Thanks here is the...

    Started by SadieKhan‎, 09-07-2010 02:28 PM
    • Replies: 4
    • Views: 5,090
    09-08-2010, 04:30 AM Go to last post
  7. can anyone help on this one?

    Given two i.i.d uniform random points x and y on the interval , what is the average size of the smallest of the three resulting intervals?

    Started by tennis89‎, 09-10-2010 07:00 PM
    • Replies: 4
    • Views: 2,462
    09-11-2010, 10:04 AM Go to last post
  8. Gamma Distribution parameters

    Hi, I'm trying to understand the theory behind the probability distributions specifically what do the shape and scale parameters for gamma...

    Started by panbalag‎, 09-19-2010 11:06 AM
    • Replies: 4
    • Views: 7,550
    09-28-2010, 01:14 AM Go to last post
  9. Question how to solve this???

    An exam starts at t=0 & is supposed to be over at t=3.The students are asked to "wrap it up" at t=2.5.The relative number of students finishing an...

    Started by sajee3a‎, 09-20-2010 03:03 AM
    • Replies: 4
    • Views: 2,685
    09-22-2010, 02:39 AM Go to last post
  10. wikipedia entry

    I was reading about false positive and found this wikipedia entry, can this be true? how come probability is greater than 1?

    Started by SadieKhan‎, 09-20-2010 06:12 AM
    • Replies: 4
    • Views: 3,012
    09-20-2010, 08:42 AM Go to last post
  11. Question How to modify this function to be a probability density function????

    f(t)=t^2 (1-t)^2 (u(t)-u(t-1)), where u(t) is the unit step function. SHOULD I INTEGRATE f(t) where i get F(T) AND THEN DIFFERENTIATE F(T) TO GET...

    Started by sajee3a‎, 09-21-2010 01:09 PM
    • Replies: 4
    • Views: 7,088
    09-21-2010, 04:25 PM Go to last post
  12. help on probability question!

    I can't seem to figure out how to go about solving this question: Workers for the health clinic measured the cholesterol of 1000 people selected...

    Started by wetnap‎, 09-23-2010 12:38 AM
    • Replies: 4
    • Views: 2,051
    09-23-2010, 01:21 AM Go to last post
  13. Jump Discontinuities in CDF's

    There aren't any examples of cumulative distribution functions with discontinuities in my textbook. I'm wondering what to do with something like...

    Started by math_guy314‎, 10-23-2010 09:59 PM
    • Replies: 4
    • Views: 6,175
    10-27-2010, 12:33 PM Go to last post
  14. Gaussian Probability - can I do this?

    Hi :) I have a question regarding Gaussian distributions. I actually am not sure where to post this, but after reading thru a few threads, it might...

    Started by jawatroxion‎, 09-28-2010 03:03 AM
    • Replies: 4
    • Views: 3,481
    09-28-2010, 10:49 PM Go to last post
  15. Angry PLZZZZ Help!! a priori probability and posteriori PDF

    Flipping a coin game.The coin is unkown,thus, the probability to have heads is unknown:P(H)=P{h}=p.Thus probability to have heads is a random...

    Started by sajee3a‎, 09-28-2010 04:20 AM
    • Replies: 4
    • Views: 3,100
    09-28-2010, 05:05 PM Go to last post
  16. Normal Distribution problem

    Question: an instructor is administering a final examination. She tells her class that she will give an A grade to the 10% of the students who earn...

    Started by ang6705‎, 09-28-2010 09:52 AM
    • Replies: 4
    • Views: 2,793
    09-28-2010, 11:36 AM Go to last post
  17. proofs are tricky

    Hi everyone! Proofs have always been a major weak point for me and I'm really struggling with the problem below. Any help or pointers to get me...

    Started by oj2222‎, 09-30-2010 02:02 AM
    • Replies: 4
    • Views: 2,885
    10-01-2010, 12:09 AM Go to last post
  18. Dependent normal distributions

    I'm doing some stock market analysis for a personal project. If I have two stocks which generate returns which are normally distributed, what is...

    Started by jstonge‎, 10-07-2010 05:17 PM
    • Replies: 4
    • Views: 9,018
    10-08-2010, 01:33 PM Go to last post
  19. from Uniform random variable to Logistic

    Given U~Unif(0,1) and X=s*ln(U/(1-U)), where s>0 is a parameter, I am hoping to get F(x), where F(x) would turn out to be a logistic cdf F(x) =...

    Started by zzzc‎, 10-07-2010 10:25 PM
    • Replies: 4
    • Views: 2,903
    10-08-2010, 12:21 AM Go to last post
  20. 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: 4,875
    12-06-2010, 10:57 PM Go to last post
  21. Is this possible?

    Hi, please help me out with this problem. I want to calculate P(X <= x) = P(sum(1->n)(Z_k) <= x) where sum(1->n)(Z_k) is the sum of Z_k from 1 to...

    Started by TheNewbie‎, 10-22-2010 06:25 AM
    • Replies: 4
    • Views: 2,065
    10-22-2010, 08:23 AM Go to last post
  22. Bayesian inference -(unknown mean and variance | and a proof)

    hello, i take a bayes lesson. there are 3 questions as my homework, i did one of them. i am new to statistics, so instructor said i can get help as...

    Started by aliyilmaz‎, 10-22-2010 09:47 AM
    • Replies: 4
    • Views: 5,103
    10-22-2010, 05:07 PM Go to last post
  23. Question help randoooomly chooooose

    Hello Everyone, I have :confused: question: Define ni to be the number of families with i children, i = 1,2,3,…..,k. Define E to be the event...

    Started by ms&ms‎, 10-25-2010 02:11 PM
    • Replies: 4
    • Views: 3,545
    10-25-2010, 05:32 PM Go to last post
  24. Question my answer and Q

    Hi, can someone please have a look at my answer and Q? Thanks In advance:). Q:Let Pi represents the probability that the ith decision appears...

    Started by ms&ms‎, 10-26-2010 10:21 PM
    • Replies: 4
    • Views: 3,119
    11-16-2010, 11:13 AM Go to last post
  25. Estimating the number of red balls drawn

    Assume that there are N jars numbered 1 to N. Each jar contains many balls. Assume that we draw a ball from i-th jar. The probability of drawing a...

    Started by faraz123‎, 10-28-2010 04:25 PM
    • Replies: 4
    • Views: 3,795
    10-29-2010, 02:29 AM Go to last post
  26. Markov chain

    There are two states, A and B; A is initial state from where Markov chain starts. If 5 out of 8 samples have probabilities P1, we move from A to B....

    Started by adnaniut‎, 11-04-2010 02:47 PM
    • Replies: 4
    • Views: 3,257
    11-04-2010, 04:36 PM Go to last post
  27. joint probability density function, using the Jacobian

    X1 and X2 are independent random variables from a standard normal distribution so the joint p.d.f of X1, X2 = p.d.f X1 x p.d.f X2 = ( 1/(2pi)^1/2)...

    Started by nicklt‎, 11-05-2010 02:31 PM
    • Replies: 4
    • Views: 7,444
    11-07-2010, 10:39 PM Go to last post
  28. Finding Mean and Variance for X^2 Given Mean and Variance for X

    I am working on a question that has me stumped. X1, X2, ... Xn are normally distributed and independent. Each has a mean of 0 and variance sigma^2....

    Started by math_guy314‎, 11-05-2010 05:56 PM
    • Replies: 4
    • Views: 72,539
    11-08-2010, 06:47 PM Go to last post
  29. Joint Density Function - Exponentials

    please delete, I overthunk myself on this one.

    Started by StatStudent3‎, 11-06-2010 05:43 PM
    • Replies: 4
    • Views: 3,124
    11-06-2010, 10:52 PM Go to last post
  30. Poisson Distribution Conditional Probability

    Hello, My name is Chris and I would greatly appreciate some help concerning the folowing Probability problem. Suppose that the number of...

    Started by Swift Freeze‎, 11-08-2010 05:22 AM
    • Replies: 4
    • Views: 15,280
    11-08-2010, 10:53 AM Go to last post
  31. 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: 6,407
    12-05-2010, 05:27 PM Go to last post
  32. very confused

    if P( Z > x ) = 0.99 – 2.33 = x is it correct ? very confused= =!:o

    Started by ho168‎, 11-12-2010 11:08 AM
    • Replies: 4
    • Views: 3,372
    11-14-2010, 12:58 AM Go to last post
  33. Just starting with probability

    Hi I am just starting with probability. I have a basic question. There are three rows R1, R2, R3, and a target can appear in any of the...

    Started by Lostkid‎, 11-16-2010 04:35 AM
    • Replies: 4
    • Views: 2,555
    11-16-2010, 01:00 PM Go to last post
  34. Question about a wording/context of a problem

    I won't give the problem in its entirety here, because my only question is the wording/context of it. But I will only give a summary. Both X and Y...

    Started by StatStudent3‎, 11-16-2010 02:23 PM
    • Replies: 4
    • Views: 2,656
    11-16-2010, 04:40 PM Go to last post
  35. random variable convergence

    Wn has density / for 0<x<1, and 0 otherwise. The random variable W has a uniform distribution on . Prove that {Wn} converges in distribution to W. ...

    Started by omega‎, 11-20-2010 01:15 AM
    • Replies: 4
    • Views: 3,186
    11-20-2010, 03:00 PM Go to last post
  36. percentile for (1 - cumulative distribution function)

    Hi, Before addressing my question, please let me define the context: The percentile is usually defined as the value of a variable BELOW which a...

    Started by athos‎, 11-20-2010 07:26 PM
    • Replies: 4
    • Views: 13,038
    01-04-2011, 10:09 AM Go to last post
  37. 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: 7,211
    11-28-2010, 12:37 PM Go to last post
  38. 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: 4,559
    11-25-2010, 09:18 PM Go to last post
  39. 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: 3,186
    11-28-2010, 05:52 PM Go to last post
  40. 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: 3,828
    12-06-2010, 04:41 PM Go to last post
  41. 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: 3,615
    12-09-2010, 12:08 PM Go to last post
  42. 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: 5,338
    12-13-2010, 12:27 AM Go to last post
  43. 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: 3,380
    12-14-2010, 12:20 PM Go to last post
  44. 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: 2,654
    12-15-2010, 06:39 PM Go to last post
  45. 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: 2,903
    12-17-2010, 04:24 PM Go to last post
  46. 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: 4,286
    12-30-2010, 03:55 PM Go to last post
  47. 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: 3,622
    12-31-2010, 02:15 PM Go to last post
  48. Probability of Victory

    Say I was looking at how all 14-seeds performed against 3-seeds over several years of the NCAA Basketball Tournament. And say I had several stats at...

    Started by haz33‎, 01-14-2011 05:16 PM
    • Replies: 4
    • Views: 3,435
    02-03-2011, 01:14 AM Go to last post
  49. Joint Distribution, where is my mistake ?

    Hi Guys, I was solving a question and getting the wrong answer, I don't know where my mistake is.... The question is: A second year student in...

    Started by WeeG‎, 01-16-2011 12:20 PM
    • Replies: 4
    • Views: 3,173
    01-16-2011, 04:36 PM Go to last post
  50. Question Mgf

    Let X and Y have the following joint probability distribution:- P(X=x,Y=y) = \frac{e^{-2}}{x!(y-x)!} , x=0,1,2,...,y ; ...

    Started by Sambit‎, 01-17-2011 12:00 PM
    • Replies: 4
    • Views: 2,295
    01-21-2011, 08:43 AM Go to last post
  51. Why can't I use the transformation...

    Why can't I use the transformation equation fy(y)=fx(x(y))AbsoluteValue to solve this problem: An actuary is reviewing a study she performed on...

    Started by jw9wz‎, 01-18-2011 11:49 PM
    • Replies: 4
    • Views: 2,687
    01-19-2011, 01:39 AM Go to last post
  52. Question Joint cdf/pmf- Multinomial Distribution.

    I'll really appreciate if somebody could take time to explain the following question's answer. Suppose that (N1, N2) is multinomial with n=2,...

    Started by Actuarial_Deepika‎, 01-30-2011 02:53 AM
    • Replies: 4
    • Views: 6,988
    01-30-2011, 11:41 PM Go to last post
  53. Sampling Distribution Question

    I have a couple questions here that I think I am doing correctly, just want some confirmation? Thanks! 1. Suppose that the final exam scores of a...

    Started by jz722‎, 02-09-2011 11:17 PM
    • Replies: 4
    • Views: 5,393
    02-12-2011, 12:22 AM Go to last post
  54. Question How would I calculate triple coin flipping in sets?

    Say you have three pennies. You throw them all in the air and record the way they land. Then you do this five more times for a total of six throws: ...

    Started by pennyman‎, 02-19-2011 06:15 PM
    • Replies: 4
    • Views: 4,852
    02-19-2011, 08:33 PM Go to last post
  55. Help with Binomial & Poisson Distribution!!

    Hello forum! I am trying to do complete my homework however I am unsure if I did what was asked correctly for one question and I am having issues...

    Started by FcNo‎, 02-24-2011 01:39 PM
    • Replies: 4
    • Views: 5,063
    02-25-2011, 12:13 PM Go to last post
  56. Is this possible?

    Hello, I've been pondering this question for a while but I don't think I have what it takes to come up with the answer. I'd really appreciate some...

    Started by TheNewbie‎, 02-24-2011 04:22 PM
    • Replies: 4
    • Views: 2,671
    02-24-2011, 05:12 PM Go to last post
  57. probability of rocket launch failure

    hi everyone. My statistics/probability knowledge is unfortunately striving towards zero, therefore I would greatly appreciate any kind of input on...

    Started by julia_w‎, 03-03-2011 07:38 AM
    consecutive, probability
    • Replies: 4
    • Views: 6,927
    03-03-2011, 10:24 AM Go to last post
  58. Probability in Census

    Hey, having some trouble with a problem: The 2000 census allowed each person to choose from a long list of races. That is, in the eyes of the...

    Started by legalesey‎, 03-11-2011 08:24 PM
    • Replies: 4
    • Views: 7,117
    03-15-2011, 05:25 PM Go to last post
  59. Plotting probability distribution

    I can't seem to find anything on the internet regarding how to solve the below question. The duration in days of two activities A and B in a...

    Started by fool‎, 03-23-2011 07:46 AM
    • Replies: 4
    • Views: 3,302
    03-25-2011, 06:07 AM Go to last post
  60. Distribution of sample mean using MGF

    I'm not sure if I posted this in the right place, correct me if I'm wrong. I have been trying to solve this question for awhile now: Let...

    Started by ifomoe‎, 04-02-2011 05:26 AM
    • Replies: 4
    • Views: 8,876
    04-02-2011, 08:27 PM Go to last post

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