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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: 30,319
    09-30-2005, 09:44 AM Go to last post
  1. Another difficult Gaussian integral

    Hello all, This time, I'm trying to compute \int^{\infty}_{-\infty} \frac{1}{c} \Phi\left(\frac{x}{a}\right)\phi\left(\frac{x-b}{c}\right) dx ...

    Started by sven svenson‎, 02-04-2011 04:12 PM
    • Replies: 3
    • Views: 4,294
    04-07-2011, 11:28 AM Go to last post
  2. Chebyshev's inequality and Error bound

    The question -------- Hello everyone.

    Started by odicon‎, 04-07-2011 12:00 AM
    • Replies: 1
    • Views: 3,598
    04-07-2011, 06:15 AM Go to last post
  3. Monte Carlo variance and error bound

    The question: ---------------- Hello everyone.

    Started by odicon‎, 04-07-2011 12:06 AM
    • Replies: 1
    • Views: 4,038
    04-07-2011, 06:11 AM Go to last post
  4. Probability

    Hi I am wondering how to find the probability of a number if only given the standard deviation and the mean. The question states the following: ...

    Started by Oreding‎, 04-06-2011 07:24 PM
    • Replies: 1
    • Views: 4,518
    04-06-2011, 08:19 PM Go to last post
  5. A contradiction in standard deviation.

    Hi there. When calculating the SD of a single spin on a European roulette wheel on a single number one gets: SD = 5.84 when using SD = sqrt...

    Started by TheDuck‎, 04-05-2011 08:17 PM
    • Replies: 1
    • Views: 2,298
    04-05-2011, 10:08 PM Go to last post
  6. Confused on where to get started

    I've already went through the problems of Pr(z>x) but I'm confused on where to get started on this problem. If Pr(Z>Zo)=.5, what is the cutoff...

    Started by Golobos00‎, 04-04-2011 07:04 PM
    • Replies: 0
    • Views: 2,375
    04-04-2011, 07:04 PM Go to last post
  7. Using Taylor expansion for calculating Expected Value

    Hello, This question is motivated by a very helpful approach suggested by BGM for solving an expected value estimation problem recently posted on...

    Started by 1stone‎, 04-04-2011 01:10 PM
    • Replies: 1
    • Views: 11,098
    04-04-2011, 02:15 PM Go to last post
  8. Is this a negative binomial?

    Is this a negative binomial? I understand the solutions. But why am I not getting the right answer using the negative binomial formula? Problem:...

    Started by Amer‎, 04-04-2011 12:04 PM
    negative binomial, probability
    • Replies: 1
    • Views: 2,596
    04-04-2011, 02:04 PM Go to last post
  9. Interpreting meaning of predicted values when using a Generalized Linear Model

    Im having trouble understanding what the predictions actually mean when using a Generalized Linear Model with e.g. a Poisson error distribution and...

    Started by Ilya Maclean‎, 04-04-2011 11:57 AM
    • Replies: 2
    • Views: 5,314
    04-04-2011, 12:30 PM Go to last post
  10. Probability question

    I read the sticky in this section about trying the problem before posting the question but I don't know where to begin on this problem. Any help...

    Started by USMstudent85‎, 04-03-2011 12:47 PM
    • Replies: 14
    • Views: 11,658
    04-03-2011, 04:15 PM Go to last post
  11. Probability using exponential distributions question

    Hi everyone, I'm working through some likelihood and probability questions. I think I have this one right but I'm not entirely satisfied with my...

    Started by languagelearner23‎, 04-02-2011 08:26 PM
    • Replies: 3
    • Views: 3,033
    04-03-2011, 11:20 AM Go to last post
  12. Likelihood Question

    Hi everyone, I'm working through some likelihood questions and am stuck on this one. I've written out my solution here so far... Q. (i) T is...

    Started by languagelearner23‎, 04-02-2011 08:04 PM
    • Replies: 2
    • Views: 3,101
    04-03-2011, 10:53 AM Go to last post
  13. Maximum Likelihood Question

    Hi everyone, I'm working through some max likelihood questions and am badly stuck on this one. Please could you take a look at what I'm doing and...

    Started by languagelearner23‎, 04-02-2011 07:45 PM
    • Replies: 2
    • Views: 3,056
    04-03-2011, 10:42 AM Go to last post
  14. Joint probability!

    A steel manufacturer is testing a new additive for manufacturing an allow of steel. The joint probability mass function of tensile streanth and...

    Started by jabba1‎, 03-29-2011 03:58 AM
    • Replies: 1
    • Views: 3,370
    04-03-2011, 03:46 AM Go to last post
  15. Please help! probability of a random variable

    The reading given by a thermometer calivrated in ice water is a random variable with probablility density function f(x) { k(1-x) -1 { 0...

    Started by jabba1‎, 03-29-2011 03:50 AM
    • Replies: 1
    • Views: 3,216
    04-03-2011, 03:39 AM Go to last post
  16. 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: 8,848
    04-02-2011, 08:27 PM Go to last post
  17. discrete distribution

    How do i find the mean and variance of a discrete distribution for both X and Y by using the marginal densities?

    Started by sindhu88‎, 04-02-2011 06:56 PM
    • Replies: 3
    • Views: 3,415
    04-02-2011, 08:23 PM Go to last post
  18. Normal Distribution

    Hello, I've just started reading a stats book, but I think this is still a prob question. I haven't done any prob/stats in 3 years, and I never...

    Started by Mirey‎, 04-02-2011 08:43 AM
    • Replies: 1
    • Views: 4,164
    04-02-2011, 09:01 AM Go to last post
  19. homework help!

    any1 who can do as much of this as possible!?? 6.Assuming that the following sample of 12 numbers arise from a Normal distribution with mean ...

    Started by 00pickj‎, 04-01-2011 06:55 AM
    • Replies: 1
    • Views: 2,790
    04-01-2011, 09:02 AM Go to last post
  20. Equation involving uniformly distributed variable

    Let U be a random variable uniformly distributed on , and let X be a dependent variable such that X^U = a for some number a (X^U means X to the power...

    Started by 1stone‎, 03-30-2011 08:30 PM
    • Replies: 5
    • Views: 3,081
    03-31-2011, 02:29 PM Go to last post
  21. Final part of four part problem

    I'm having trouble with the last part of a 4 part question as follows: Consider domain D={(x,y): 0<x<1, -x<y<x} with frequency distribution...

    Started by StatsStudent7‎, 03-31-2011 06:22 AM
    • Replies: 1
    • Views: 2,507
    03-31-2011, 11:10 AM Go to last post
  22. Homework Problem

    Hi, I am a beginner in statistics, and can't figure out this problem: "In a highly publicized murder trial it was estimated that 25 percent of the...

    Started by bornconfused‎, 03-27-2011 01:12 AM
    anomaly, one-proportion test
    • Replies: 3
    • Views: 4,758
    03-31-2011, 12:47 AM Go to last post
  23. Video lectures on SDE's

    Hi people. Does anyone know of an online lecture series on stochastic processes and/or stochastic differential equations?

    Started by mads_st‎, 03-25-2011 12:13 PM
    • Replies: 1
    • Views: 6,054
    03-30-2011, 05:55 PM Go to last post
  24. converting geometric distribution to the exponential family

    converting geometric distribution to the exponential family f(x,p)=p^x*(1-p) does anyone know how to do this

    Started by mitz‎, 03-30-2011 01:53 AM
    • Replies: 1
    • Views: 5,111
    03-30-2011, 09:01 AM Go to last post
  25. Question Is this Bayesian solution correct?

    I'm working on understanding the theorem, so I designed a question for myself: If 80% of students passed, 50% of students cheated, and 90% of...

    Started by InIbra‎, 03-29-2011 05:15 PM
    • Replies: 2
    • Views: 2,829
    03-29-2011, 07:24 PM Go to last post
  26. Probability Problems

    Stuck on the basics, can anyone help me here?? Suppose an SRS of 25 years from panama's rainfall history is chosen. Let x bar be the mean amount...

    Started by kpcrooks‎, 03-28-2011 06:17 PM
    • Replies: 1
    • Views: 2,768
    03-29-2011, 02:51 AM Go to last post
  27. Theorem of Total Probabilities

    I appreciate your help.

    Started by af_231‎, 03-28-2011 06:49 AM
    • Replies: 1
    • Views: 4,189
    03-28-2011, 10:51 AM Go to last post
  28. Counting question

    A bit of an odd problem because I was just doing this out of curiosity while helping a friend with this. I have a hat with 5 cards in it. I want...

    Started by c2q‎, 03-27-2011 09:45 PM
    • Replies: 2
    • Views: 2,260
    03-27-2011, 10:12 PM Go to last post
  29. Using multinomial logit to find probabilities

    Hi, I am searching for assistance with a problem that I have been trying to solve over the past week. I have been doing some research on multinomial...

    Started by nitemonkey‎, 03-20-2011 11:22 PM
    • Replies: 1
    • Views: 3,280
    03-26-2011, 10:49 PM Go to last post
  30. Conditional Expectation Problem

    Hi all I need to solve the following problem: If E(X|Y)=Y and E(Y|X)=X, prove that X=Y almost surely. Seems like I'll need to use the...

    Started by symmetry‎, 03-25-2011 10:18 PM
    • Replies: 5
    • Views: 4,746
    03-26-2011, 12:36 PM Go to last post
  31. 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: 3,289
    03-25-2011, 06:07 AM Go to last post
  32. construction project probability

    A construction project is about 2 months away from the scheduled completion date. Based on the progress of the project to date, the contractor...

    Started by fool‎, 03-23-2011 06:11 AM
    • Replies: 3
    • Views: 4,201
    03-25-2011, 12:13 AM Go to last post
  33. probability help...poisson process

    hi there can any one explain and show me how this is done please , i have a book at home and there are lots of unexplained questions . During...

    Started by bobby37‎, 03-23-2011 03:23 PM
    • Replies: 1
    • Views: 2,258
    03-23-2011, 04:28 PM Go to last post
  34. Help with Probability Distribution please?

    I'm working on a STAT class at a community college and have a take home project. The first question is confusing me. I don't expect someone to give...

    Started by jpitten‎, 03-23-2011 12:54 PM
    • Replies: 1
    • Views: 2,837
    03-23-2011, 01:06 PM Go to last post
  35. kleptomania

    If the average shoplifter goes 49 times before getting caught, this seems like a profitable and relatively risk-free enterprise. It sounds like the...

    Started by Outlier‎, 03-21-2011 02:57 PM
    • Replies: 2
    • Views: 2,949
    03-23-2011, 11:24 AM Go to last post
  36. Probability Problem

    Hello everyone!! I need to solve the following problem: Derive the followings equations: - P(AC)=P(AB1C)+...+P(ABNC) -...

    Started by af_231‎, 03-22-2011 08:21 PM
    • Replies: 0
    • Views: 1,952
    03-22-2011, 08:21 PM Go to last post
  37. Probability | Card deck

    A card is drawn from a well shuffled deck of 52 cards. Find P(drawing a face card or a 4). Now since the cards can't be replaced, would you get...

    Started by chadmac‎, 03-22-2011 01:14 AM
    • Replies: 1
    • Views: 6,447
    03-22-2011, 01:58 AM Go to last post
  38. Expected Profit

    This question is really confusing me: The annual profit Y(in $100,000) can be expressed as a continuous function of drug demand x(in 1,000): Y(x)...

    Started by stat_student001‎, 03-21-2011 03:30 PM
    • Replies: 6
    • Views: 12,282
    03-21-2011, 10:53 PM Go to last post
  39. probability problem

    Hi, First Thanks in advance. I am current studying distance education and struggle with some probability homework Qs. So glad I found this site. ...

    Started by fool‎, 03-18-2011 01:32 AM
    • Replies: 9
    • Views: 7,130
    03-21-2011, 10:35 PM Go to last post
  40. Chance/probability

    Hi everyone! This is my first post here, so I'm hoping you guys could help. I'm having some difficulty with this problem: A pharmeceutical company...

    Started by jeffreyS‎, 03-21-2011 04:36 PM
    • Replies: 2
    • Views: 3,527
    03-21-2011, 06:30 PM Go to last post
  41. Probability Question

    Suppose that a random sample of beer is taken to assure the quality of the beer. You select a sample of size 50 from a population with an unknown...

    Started by piccolo8‎, 03-20-2011 10:48 AM
    • Replies: 3
    • Views: 2,019
    03-21-2011, 02:16 PM Go to last post
  42. a question

    Hi I need an answer Consider N variables uniform distributed over the set 0 and 1. What is the highest expected value among them? Thx, Ori

    Started by ori‎, 03-21-2011 01:36 AM
    • Replies: 1
    • Views: 2,026
    03-21-2011, 08:57 AM Go to last post
  43. Conditional Probability

    Hello!!! Can anyone help me with this problem??...please!!! In relation to Equation P(A│B)=P(AB) / P(B) Show that: P(A│B)P(B)=P(B│A)P(A)

    Started by af_231‎, 03-14-2011 10:37 PM
    • Replies: 5
    • Views: 2,691
    03-20-2011, 09:12 PM Go to last post
  44. Finding data value corresponding to a probability

    My apologies if this is in the wrong section first of all, probability seemed appropriate. Starting off with the question I'm trying to come up...

    Started by goles‎, 03-20-2011 04:43 PM
    • Replies: 6
    • Views: 8,411
    03-20-2011, 06:47 PM Go to last post
  45. Question Interpreting Interaction Effects

    I have ran interaction effects in Binomial logistic regression. I know how to interpret the interaction effect but I am having trouble interpreting...

    Started by tkjgx2‎, 03-18-2011 04:21 PM
    binomial logistic regress, interaction effect
    • Replies: 1
    • Views: 3,489
    03-20-2011, 05:16 PM Go to last post
  46. Normal approximation

    Given n=200 and p = 0.01 (probability that you will find a customer spending less that $100). Find the probability that you won't find any that spend...

    Started by raamaak‎, 03-20-2011 07:26 AM
    • Replies: 10
    • Views: 5,748
    03-20-2011, 04:05 PM Go to last post
  47. what test shoud I use?

    hi! I have a problem, I don't know which test should I use... So here it goes: Let's assume we are observing a population of students on a...

    Started by little_stats‎, 03-19-2011 06:34 AM
    • Replies: 8
    • Views: 3,062
    03-20-2011, 09:10 AM Go to last post
  48. basic lotto question

    Hi there, I was always confused with combinations etc but in most cases I was able to find my way out. But this one is really annoying me: ...

    Started by leo nidas‎, 03-19-2011 11:33 AM
    basic, otto, question
    • Replies: 1
    • Views: 2,281
    03-19-2011, 11:37 AM Go to last post
  49. Evolution of CDF as more information is gained?

    Hi. Just trying to figure out something for one of my hobbies... I have a PDF that describes the wait time between event 1 (which happens at...

    Started by AdrianB‎, 03-17-2011 09:51 PM
    • Replies: 1
    • Views: 2,621
    03-18-2011, 12:05 AM Go to last post
  50. Homework Qs help

    Hi I really dont understand were or with what im supposed to start with these questions. 10. A star is suspected of occasional outbursts of...

    Started by sam_021‎, 03-16-2011 12:02 PM
    • Replies: 1
    • Views: 2,936
    03-17-2011, 01:56 PM Go to last post
  51. Question MLE of range of Uniform(a,b)

    So, I want an MLE for (b - a). log L(a,b|x) = -n log (b - a) given a < x_(1) and b > x_(n) but d/da log L gives me n/(b-a) >, and in fact =/=...

    Started by conundrum‎, 03-16-2011 06:47 PM
    mle, mvue, uniform
    • Replies: 9
    • Views: 10,905
    03-17-2011, 12:13 PM Go to last post
  52. Please help me!!

    Derive the followings equations:

    Started by af_231‎, 03-15-2011 09:08 PM
    • Replies: 1
    • Views: 2,635
    03-16-2011, 12:40 AM Go to last post
  53. Please help

    figured out the answers...thanks anyway! =)

    Started by neverforgotten4410‎, 03-15-2011 07:05 PM
    • Replies: 0
    • Views: 2,194
    03-15-2011, 07:05 PM Go to last post
  54. 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: 7,088
    03-15-2011, 05:25 PM Go to last post
  55. Is this problem even possible to solve?

    "Last year 75% of Joe Shack's cash purchases were for less than $150. In a random sample of 200 cash processing companies, what is the probability of...

    Started by blippy‎, 03-14-2011 09:33 PM
    • Replies: 2
    • Views: 2,674
    03-15-2011, 12:30 AM Go to last post
  56. bidding probability

    Hi. I am not overly familiar with statistics. I am preparing a manuscript and I need a formula to determine probability. Here is the problem. ...

    Started by andyploom‎, 03-14-2011 02:45 PM
    • Replies: 0
    • Views: 2,845
    03-14-2011, 02:45 PM Go to last post
  57. Probabilty : Round permutation problem

    A garland is to be formed with five roses and five dahlias. If they are arranged randomly, find the probability of roses and dahlias being arranged...

    Started by ak4su‎, 03-10-2011 07:51 AM
    • Replies: 5
    • Views: 4,844
    03-14-2011, 09:53 AM Go to last post
  58. Probability of a RV being higher than another

    Hi, I have two random variables, say X1~N(m1,v1) and X2~N(m2,v2), how would I work out P(X1<X2) etc?

    Started by wafll‎, 03-13-2011 08:19 PM
    • Replies: 3
    • Views: 3,215
    03-14-2011, 08:19 AM Go to last post
  59. normal approximation to binomial

    Hi Guys, I was solving a question and got wrong answer, don't know why... X~Bin(100,0.2) P(15<X<22) = ? I used the normal approximation: ...

    Started by WeeG‎, 03-12-2011 01:45 PM
    • Replies: 5
    • Views: 5,137
    03-13-2011, 04:54 AM Go to last post
  60. central limit theory question

    hi: I have a exam coming up Monday and in reviewing the sample questions, I hit a snag and was looking for some help. The question is as follows:...

    Started by senorkoki‎, 03-12-2011 09:28 PM
    • Replies: 1
    • Views: 2,502
    03-12-2011, 11:30 PM Go to last post

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