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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: 30,322
    09-30-2005, 09:44 AM Go to last post
  1. Angry PLZZZZZ HELP!!!!Asymptotic approximation for ppisson distribution

    RV X is a Poisson variable.find asymptotic aproximation for this distribution. >>>first i got the charactersitic function im wondering if i...

    Started by sajee3a‎, 10-03-2010 10:00 PM
    • Replies: 1
    • Views: 2,014
    10-04-2010, 10:19 AM Go to last post
  2. Binomial MLE

    Hello, I need some clarification on the following problem. Suppose Y ~ Bin (189, 59/189) Graphically show the likelihood function and...

    Started by jamesmartinn‎, 10-03-2010 02:02 PM
    • Replies: 1
    • Views: 4,511
    10-04-2010, 02:25 AM Go to last post
  3. About convergence of a monotonic sequence

    If {X_n} is a monotonically increasing sequence, such that X_1 <= X_2 <= X_3 <= ... and there's some subsequence of {X_nk} of {X_n} such that ...

    Started by evalover1987‎, 10-03-2010 03:26 AM
    • Replies: 0
    • Views: 4,119
    10-03-2010, 03:26 AM Go to last post
  4. Unhappy Excel's ERF(x) function

    I want to provide a formula in terms of Excel's ERF(x) function that calculates the G(x) function. >>>I know that erf(x)=G(x)-1/2 by...

    Started by sajee3a‎, 10-02-2010 01:50 PM
    • Replies: 0
    • Views: 3,446
    10-02-2010, 01:50 PM Go to last post
  5. Psychic question

    Hi there. Heres a question in my book: A psychic is shown 20 people and told that 10 are criminals and 10 are innocent. The psychic's task...

    Started by hank755‎, 10-01-2010 11:33 AM
    • Replies: 1
    • Views: 1,897
    10-01-2010, 03:44 PM Go to last post
  6. Gaussian random number generator

    Hi guys, I'm quite stuck with how this random number generator works. I know that the random numbers it generates follow the normal distribution....

    Started by secondrate‎, 09-30-2010 11:35 PM
    • Replies: 1
    • Views: 4,058
    10-01-2010, 01:44 PM Go to last post
  7. Help with probability..asap plz

    An entomologist is studying the effect of a chemical sex attractant (pheromone) on insects. Several insects are released at a site equidistant from...

    Started by ena‎, 09-27-2010 06:22 PM
    • Replies: 5
    • Views: 6,543
    10-01-2010, 05:30 AM Go to last post
  8. The famous cereal box prizes puzzle

    One version says that a cereal company puts four different prizes one in each of all their boxes. The prizes are evenly distributed. How many...

    Started by arkane‎, 10-01-2010 02:33 AM
    • Replies: 0
    • Views: 4,452
    10-01-2010, 02:33 AM Go to last post
  9. 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: 2,877
    10-01-2010, 12:09 AM Go to last post
  10. Question How to prove the epected value of the following?

    PROVE THAT E{e^tX}=e^tmiu SUM(n=0,infinity) miu(n) t^n /n! where miu is the mean and miu(n)=E{(x-miu)^n} are the central moments >>>should i...

    Started by sajee3a‎, 09-30-2010 12:52 PM
    • Replies: 2
    • Views: 4,432
    09-30-2010, 02:01 PM Go to last post
  11. Question How to use DeMoivre-laplace theorem here????

    Use the results of the Demoivre-Laplace theroem to solve the following: An unfair coin (p{h}=p=0.6) is tossed n=20 times; find the probability that...

    Started by sajee3a‎, 09-30-2010 12:39 PM
    • Replies: 0
    • Views: 3,094
    09-30-2010, 12:39 PM Go to last post
  12. Children Gender Split Probability Question

    Hello everyone, I've another question on probability (: A randomly chosen family has 4 children. Assume that the chance of having a son or a...

    Started by mysterdusk‎, 09-30-2010 09:56 AM
    • Replies: 1
    • Views: 4,183
    09-30-2010, 10:02 AM Go to last post
  13. Poker Card Probability Question

    Good evening everyone, I have the following question: Jane plays a game where she randomly draws a card from a pile of 3 poker cards initially...

    Started by mysterdusk‎, 09-28-2010 05:54 AM
    • Replies: 6
    • Views: 3,197
    09-30-2010, 10:01 AM Go to last post
  14. Integrations by part - Expected Value

    Hi guys, I need to prove that E = int - int Any starting points ? Thank you!

    Started by Dibbs‎, 09-29-2010 11:31 PM
    • Replies: 1
    • Views: 2,831
    09-30-2010, 05:00 AM Go to last post
  15. how many seating arrangements are possible

    Delegates from 8 countries (G8): U.S., U.K., France, Germany, Italy, Russia, Japan and Canada are to be seated around a circular table. How many...

    Started by e-norman‎, 09-20-2010 10:54 PM
    • Replies: 2
    • Views: 5,762
    09-29-2010, 08:20 PM Go to last post
  16. Probability help needed

    Each state of the 50 in the US has two senators. What is the probability that in a random committee of 50 senators (a) Maryland is represented (b)...

    Started by Zennie‎, 09-28-2010 09:55 PM
    • Replies: 1
    • Views: 4,541
    09-28-2010, 11:39 PM Go to last post
  17. Normal Distribution

    The time for symptoms of fire blight to develop in apple seedlings maintained at a temperature of 25C is normally distributed with a mean of 7 days...

    Started by ang6705‎, 09-28-2010 09:48 PM
    • Replies: 1
    • Views: 3,115
    09-28-2010, 11:36 PM Go to last post
  18. 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: 3,463
    09-28-2010, 10:49 PM Go to last post
  19. Unhappy statistical procedures

    What do I gather out of this based on the chi square at the end? Some 54% of subjects in the control group and 44% of subjects in the...

    Started by jenclark242‎, 09-28-2010 12:36 PM
    • Replies: 3
    • Views: 2,599
    09-28-2010, 09:11 PM Go to last post
  20. 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: 3,092
    09-28-2010, 05:05 PM Go to last post
  21. 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: 2,782
    09-28-2010, 11:36 AM Go to last post
  22. Question Duplication Probability Question

    I have a list of 8 items. The list is duplicated so there are two of each item. If I were to then randomize the list of 16 items, and select the...

    Started by stats_10‎, 09-28-2010 08:02 AM
    • Replies: 3
    • Views: 2,366
    09-28-2010, 11:03 AM Go to last post
  23. Convergence of random variables

    Hi guys, I have two questions that I don't really know how to approach. 1. Consider a random variable Zn = max (1<= k <= n) Xk where Xk is...

    Started by Dibbs‎, 09-28-2010 07:56 AM
    • Replies: 1
    • Views: 1,985
    09-28-2010, 10:36 AM Go to last post
  24. 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: 7,534
    09-28-2010, 01:14 AM Go to last post
  25. probability and random processes with applications to signal processing Henry Stark

    Hi, I need this e book Probability and Random Processes with Applications to Signal Processing (3rd Edition) Henry Stark, John W. Woods. Has...

    Started by mkl‎, 09-27-2010 02:52 PM
    • Replies: 0
    • Views: 5,239
    09-27-2010, 02:52 PM Go to last post
  26. Probability of outcome that hasn't been previously recorded.

    Hello, If I have three binary random variables: A B and C, and the following set of test results, how can I guess the value of x? A B C 1 0...

    Started by alexeiboronine‎, 09-27-2010 01:09 PM
    • Replies: 0
    • Views: 1,942
    09-27-2010, 01:09 PM Go to last post
  27. Help with a probability problem

    There were three parts to the following problem I solved with no problem but part D I can't figure out for the life of me. Can anybody offer any...

    Started by vegas1‎, 09-27-2010 10:30 AM
    • Replies: 2
    • Views: 6,573
    09-27-2010, 12:16 PM Go to last post
  28. Doesn't "At least" mean greater than

    Thank you for taking the time to read my question :) I was given a question that reads: We would like to test whether the percentage of students...

    Started by ealeql‎, 09-26-2010 05:31 PM
    • Replies: 7
    • Views: 36,609
    09-27-2010, 10:35 AM Go to last post
  29. Probability Density Function and Cumulative Distribution Function

    Hi everybody, If anyone has experience working with probability density functions (pdf), please look these sample problems over and if you could,...

    Started by kookie‎, 09-26-2010 03:47 PM
    • Replies: 5
    • Views: 13,398
    09-27-2010, 06:34 AM Go to last post
  30. What is "countability" mean exactly.

    Hi, If a question said, S is uncountable, does that mean it is infinite? my professor said that: a set is countable if it can be put into a one...

    Started by c2q‎, 09-26-2010 08:32 PM
    • Replies: 2
    • Views: 3,979
    09-27-2010, 01:05 AM Go to last post
  31. What is the professor asking for?

    I am having difficulty understanding what it is the problem is asking for here. Asked the professor and did not get a lot of help. Please help! ...

    Started by Tjfarmer‎, 09-26-2010 05:02 PM
    • Replies: 3
    • Views: 2,908
    09-26-2010, 08:57 PM Go to last post
  32. Counting rules.

    Hi, Can someone please explain to me why the answer to this question is as written? Suppose we deal four 13-card bridge hands from an ordinary...

    Started by c2q‎, 09-24-2010 03:50 PM
    • Replies: 9
    • Views: 6,803
    09-26-2010, 08:20 PM Go to last post
  33. Kookie's Own Thread.

    Hi everyone, I am a very new member here so I do not know my way around the forum. I've been searching for the option where I can post a question...

    Started by kookie‎, 09-26-2010 10:50 AM
    • Replies: 2
    • Views: 3,230
    09-26-2010, 03:38 PM Go to last post
  34. probability question

    If the distribution of the standardized value of risk, associated with smoking with cancer, follow a Z distribution, then compute the probability of...

    Started by kate1978‎, 09-26-2010 11:15 AM
    • Replies: 1
    • Views: 2,519
    09-26-2010, 11:40 AM Go to last post
  35. question involving standard cauchy distribution

    nvm solved it. - X1, X2, X3, ... are independent random variables with a standard Cauchy distribution. Prove or disprove the following. ...

    Started by evalover1987‎, 09-25-2010 07:07 PM
    • Replies: 1
    • Views: 4,529
    09-25-2010, 07:24 PM Go to last post
  36. Integrating a probability out

    I really do not know & understand about integrating out a probability, in fact I really do not understand the phrase integrate something out. The...

    Started by PeterVincent‎, 05-09-2010 08:59 AM
    • Replies: 2
    • Views: 11,735
    09-25-2010, 01:47 PM Go to last post
  37. Question How to solve composite function of random variable?

    X is a Cauchy random variable (fX(x)=1/pi(x^2 + 1)). Determine fY(y) if Y=g(X) and g(x) is: x-1 x>1/2 ...

    Started by sajee3a‎, 09-25-2010 03:10 AM
    • Replies: 1
    • Views: 7,152
    09-25-2010, 03:59 AM Go to last post
  38. Post Confidence Interval

    Hi all, I am new to this forum and wanted help in calculating Confidence interval (CI) I have 3 possible outcomes with probability of say p1, p2,...

    Started by rockerd‎, 09-23-2010 12:17 AM
    • Replies: 1
    • Views: 2,943
    09-24-2010, 03:13 PM Go to last post
  39. Project ideas for probability n stats

    I needed ideas to prepare a project which has application of probability or stats in some form. The project contains a significant programming part...

    Started by pearl‎, 09-23-2010 12:04 PM
    • Replies: 0
    • Views: 5,918
    09-23-2010, 12:04 PM Go to last post
  40. simple probability question

    Dear all, I am in need of an advice regarding a conditional probability... Although it is very simple, I haven't found anywhere anything similar...

    Started by matlabeginner‎, 09-23-2010 05:49 AM
    • Replies: 1
    • Views: 2,980
    09-23-2010, 07:32 AM Go to last post
  41. Here we go again.

    Based on the history and physical examination, your patient has a 0.3 probability of having a leg thrombosis (blood clot) in the large veins of his...

    Started by SadieKhan‎, 09-23-2010 04:34 AM
    • Replies: 0
    • Views: 1,612
    09-23-2010, 04:34 AM Go to last post
  42. 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: 2,039
    09-23-2010, 01:21 AM Go to last post
  43. Angry Bayesian kills me

    I have been practicing this Bayesian thing as you can tell.. so here I have made another attempt to get my concepts clear, If the pre-test...

    Started by SadieKhan‎, 09-22-2010 04:12 PM
    • Replies: 11
    • Views: 3,887
    09-23-2010, 12:54 AM Go to last post
  44. Question Probability Distribution

    The time (in hours) it takes before belts X and Y need replacing in a high use machine follows the joint probability distribution: integral y/100*...

    Started by SadieKhan‎, 09-21-2010 02:28 PM
    • Replies: 8
    • Views: 4,085
    09-22-2010, 01:01 PM Go to last post
  45. 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: 2,667
    09-22-2010, 02:39 AM Go to last post
  46. Probability practise

    An electrical system is set up such that power can get from the source to the switch if both parts A and B are working, if part C is working or if...

    Started by SadieKhan‎, 09-18-2010 05:29 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 6,718
    09-21-2010, 04:41 PM Go to last post
  47. 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: 7,045
    09-21-2010, 04:25 PM Go to last post
  48. Genetics Probability Question

    There is a genetic completely recessive trait. Neither mother or father display the trait but they may be heterozygous carriers. The...

    Started by Giacomo‎, 09-21-2010 03:51 PM
    • Replies: 1
    • Views: 4,095
    09-21-2010, 04:17 PM Go to last post
  49. Inverse Gamma alternative parameterization?

    Hi all, I am trying to generate RVs from an Inverse Gamma(nu,s) in order to replicate some Bayesian estimations. The parameterization given in...

    Started by jseabold‎, 09-20-2010 02:43 PM
    • Replies: 2
    • Views: 3,504
    09-21-2010, 09:01 AM Go to last post
  50. false positive

    A company has developed a new drug screening test which correctly identifies cocaine users 97% of the time; marijuana users 88% of the time and other...

    Started by SadieKhan‎, 09-20-2010 01:32 PM
    • Replies: 3
    • Views: 6,492
    09-21-2010, 03:53 AM Go to last post
  51. What is meant by mod

    X(i,j)=k mod 4, Where (i,j=1,...6) & k=i+j Everything is clear, but what is meant by mod 4 here?

    Started by sajee3a‎, 09-18-2010 02:05 AM
    • Replies: 2
    • Views: 4,398
    09-21-2010, 02:27 AM Go to last post
  52. Simple probability question.

    Hi, this is a fairly simple problem that is confusing me a bit on some matters. A person watches tv at 6pm 2/3 of the time, and watches tv at 11pm...

    Started by c2q‎, 09-20-2010 08:32 PM
    • Replies: 1
    • Views: 3,213
    09-20-2010, 11:55 PM Go to last post
  53. Transformation of random variables

    Suppose X ~ N(0,1). Let Y = exp(x). Find the pdf of Y. P(Y < y) = P(exp(x) < y) = P(x < log(y)) = intergral from ln(y) to 0 for the standard...

    Started by jamesmartinn‎, 09-20-2010 06:26 PM
    • Replies: 1
    • Views: 2,904
    09-20-2010, 06:56 PM Go to last post
  54. counting rule?

    20 students have to be split into 5 different labs groups; how many ways can we partition them if the first 3 labs have 3 students, the 4th has 5...

    Started by SadieKhan‎, 09-19-2010 11:51 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,176
    09-20-2010, 10:52 AM Go to last post
  55. 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: 3,005
    09-20-2010, 08:42 AM Go to last post
  56. Pdf

    I'm asked to modify this function into a PDF(probability density function): f(t)=t^2(1-t)^2(u(t)-u(t-1)) Should I differentiate this function?

    Started by sajee3a‎, 09-18-2010 02:00 AM
    • Replies: 3
    • Views: 2,524
    09-20-2010, 03:04 AM Go to last post
  57. Need some help understanding probability theory.

    Hello, My probability course has just started and I have a little trouble in preparation for my first quiz tomorrow, understanding some concepts....

    Started by c2q‎, 09-19-2010 04:41 PM
    • Replies: 5
    • Views: 4,929
    09-19-2010, 10:02 PM Go to last post
  58. Random-walk models

    Recently read about an example of the random-walk in an old Astrophysics book I picked up when they were cleaning out the college library. Anyone...

    Started by freebird2008‎, 09-19-2010 08:36 PM
    • Replies: 0
    • Views: 2,538
    09-19-2010, 08:36 PM Go to last post
  59. Rv

    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, 09-18-2010 01:54 AM
    • Replies: 1
    • Views: 1,956
    09-19-2010, 03:39 PM Go to last post
  60. Easy normal dist

    A heating/cooling company advertises that any customer buying an air conditioner during the first 16 days of December will receive a 25% discount if...

    Started by SadieKhan‎, 09-18-2010 11:45 AM
    • Replies: 3
    • Views: 3,271
    09-19-2010, 11:47 AM Go to last post

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