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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: 30,232
    09-30-2005, 09:44 AM Go to last post
  1. Question Bidding question - (Uniform Probability Distribution)

    Suppose you are interested in bidding on a piece of land and we know one other bidder is interested. The seller announced that the highest bid in...

    Started by Parillamaster‎, 02-14-2006 10:40 AM
    • Replies: 4
    • Views: 18,983
    02-14-2006, 12:26 PM Go to last post
  2. 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: 18,955
    12-09-2010, 10:41 AM Go to last post
  3. Crying inside 😖 just can't quite get probability

    I'm taking stats online and this unit is on probability. I'm having a terrible time understanding it. The conditional probability rule is where I'm...

    Started by notastatswizard‎, 06-29-2015 03:03 AM
    • Replies: 0
    • Views: 18,768
    06-29-2015, 03:03 AM Go to last post
  4. how to find probability with percentages?

    Say i have 25% of the sodas are pepsi and there are a certain number of those pepsi's with a special code under the cap how could i find the...

    Started by FoxTrot049r‎, 03-17-2013 11:54 AM
    • Replies: 4
    • Views: 18,619
    03-17-2013, 05:19 PM Go to last post
  5. difference between binomial exact test and fisher's exact test

    Hello all, So I know the general difference between these tests --binomial exact test is used to test for a significant difference between and...

    Started by statsathens‎, 05-12-2011 02:03 PM
    • Replies: 1
    • Views: 18,365
    01-31-2012, 11:04 AM Go to last post
  6. Stats help Please!!!!

    This problem is driving me crazy! The length of time to complete a door assembly on an automobile factory assembly line is normally distributed...

    Started by becca3848‎, 12-16-2005 06:55 PM
    • Replies: 7
    • Views: 17,700
    12-18-2005, 01:56 PM Go to last post
  7. Cauchy-Schwarz inequality: cov(X,Y)]^2 ≤ var(X) var(Y)

    Suppose that X andy Y are (scalar) random variables. Show that ^2 ≤ var(X) var(Y). (Cauchy-Schwarz inequality) Sow that equality holds if and...

    Started by kingwinner‎, 10-10-2009 06:03 PM
    • Replies: 0
    • Views: 17,451
    10-10-2009, 06:03 PM Go to last post
  8. Equation for the Standard Normal Curve

    Does anybody know what the equation is for the standard normal curve? In my statistics class, we use a chart to find areas under the curve given...

    Started by dogginboggin‎, 04-15-2010 08:40 PM
    • Replies: 6
    • Views: 17,441
    04-16-2010, 04:52 PM Go to last post
  9. This probability problem is all over the internet...

    This seems to be a common statistics homework question, as it is all over the internet. Because of this, I know the answer (0.2904), but that is not...

    Started by Haikuseasmoke‎, 10-28-2009 01:33 PM
    • Replies: 3
    • Views: 17,250
    10-28-2009, 05:02 PM Go to last post
  10. Talking too many gumballs

    i am pulling my hair out over this chapter on probability. First question which formula do I use to determine this answer. A gumball machine...

    Started by hilarysears77‎, 10-07-2005 01:52 PM
    • Replies: 1
    • Views: 17,233
    10-07-2005, 02:25 PM Go to last post
  11. Immortality & Bayesian Statistics

    - I seem to have written an 8 page paper virtually proving -- through Bayesian statistics -- that we are immortal (or something similar). Obviously,...

    Started by Jabba‎, 03-16-2015 10:12 AM
    6 Pages
    1 2 3 ... 6
    • Replies: 81
    • Views: 16,975
    04-06-2015, 05:11 PM Go to last post
  12. Confidence Interval for gamma distribution mean

    Hello I have a same problem which has been irritating me for so long now. The internet was no help so I post it here. If any of you guys have any...

    Started by keyhs‎, 02-26-2013 07:01 AM
    • Replies: 3
    • Views: 16,955
    02-27-2013, 04:07 PM Go to last post
  13. E(X) < ∞ ? What does it mean?

    Let X and Y be random variables, F be a function. I have seen in a variety of contexts that they write "E(X) < ∞". What does it mean? My guess is...

    Started by kingwinner‎, 07-14-2009 11:49 PM
    • Replies: 5
    • Views: 16,868
    07-15-2009, 05:30 PM Go to last post
  14. Probability Homework(2)

    The deeper i go into the probability chapter, the more confused i get :(, here are sum questions. they might be really easy but i'm not getting them....

    Started by aisha00‎, 12-09-2010 12:14 PM
    • Replies: 9
    • Views: 16,840
    02-24-2012, 11:19 PM Go to last post
  15. probability of failure in a multi-component system

    I want to calculate the failure rate of a system that has multiple independent points of failure. If any one of these intermediate points fail then...

    Started by sbarefoo‎, 01-15-2010 08:44 AM
    • Replies: 2
    • Views: 16,585
    01-19-2010, 10:09 AM Go to last post
  16. Pollutants in auto exhausts.

    Hello all - I am in need of some assistance with a probability problem. I am thoroughly confused and I don't know what to do. Any help is...

    Started by crosby87‎, 10-24-2009 03:01 PM
    • Replies: 2
    • Views: 16,418
    10-25-2009, 11:26 AM Go to last post
  17. Confidence Interval and SRS

    Another quick question.... Q: Running Red Lights A survey of licensed drivers inquired about running red lights. One question asked "Of...

    Started by mackerbuddy‎, 11-14-2005 04:29 AM
    • Replies: 1
    • Views: 16,151
    11-14-2005, 09:27 AM Go to last post
  18. Characteristic function of the Gamma distribution

    I have not been able to find anywhere a rigorous derivation of the characteristic function of the Gamma distribution. Any suggestions?

    Started by Pandoga‎, 11-17-2011 12:30 PM
    • Replies: 3
    • Views: 16,135
    11-18-2011, 03:41 AM Go to last post
  19. Product Normal Distribution

    Hi, Summing normal distributions is nice and easy, providing another normal distribution. But multiplying gives the Product Normal Distribution....

    Started by BigBugBuzzz‎, 01-20-2012 10:51 AM
    productnormaldist
    • Replies: 6
    • Views: 15,988
    01-20-2012, 12:54 PM Go to last post
  20. Combining two different normal distributions.

    I have done the following question: In a hospital, 1/3 of the people who use a particular elevator are adults and 2/3 are children. The weight of...

    Started by univariate‎, 11-21-2010 09:55 PM
    • Replies: 10
    • Views: 15,799
    11-23-2010, 10:41 PM Go to last post
  21. Red face Standard Normal Distribution

    Here is a question that I am trying to answer for myself. I think I figured out A alright. Anyway, here it is: In the standard normal...

    Started by jkeelsnc‎, 06-13-2008 02:08 PM
    • Replies: 2
    • Views: 15,797
    06-15-2008, 09:58 PM Go to last post
  22. Independent Event if A is a subset of B ???

    I have a questions regarding Conditional Probability. Two events A and B are independent if: P(AnB)=P(A)*P(B) Is this always the case or are...

    Started by Mats Marquardt‎, 10-23-2011 12:27 PM
    independent events
    • Replies: 5
    • Views: 15,770
    10-23-2011, 04:55 PM Go to last post
  23. Births

    Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of an other...

    Started by carebear70417‎, 10-09-2005 09:08 PM
    • Replies: 1
    • Views: 15,766
    10-09-2005, 09:22 PM Go to last post
  24. Distributive Law P[A u (B n C)]

    I am trying to find a synonymous formula formula for: P = P Can anybody help me? I found somewhere that said it was equal to P but I...

    Started by lancearmstrong1313‎, 11-05-2011 03:27 PM
    • Replies: 4
    • Views: 15,724
    11-05-2011, 04:07 PM Go to last post
  25. Generate Random Correlated Variable

    I have established a correlation between independent X and dependent Y. Is there a formula for generating a random Y from a particular X? For...

    Started by cisaak‎, 01-15-2012 11:18 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 15,238
    06-29-2012, 09:43 AM Go to last post
  26. 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: 15,190
    11-08-2010, 10:53 AM Go to last post
  27. Immortality and Conditional Probability

    - Hopefully, I won't aggravate readers so much with this approach. - Here, my claim is simply that the likelihood of my current existence is...

    Started by Jabba‎, 04-13-2015 10:20 AM
    5 Pages
    1 2 3 ... 5
    • Replies: 71
    • Views: 14,521
    04-22-2015, 06:50 AM Go to last post
  28. show that the sum of e(i) = 0 and the sum of e(i)*Yhat(i) = 0

    Consider a usual multiple linear regression model: Y = X β + ε where Y is a (n x 1) response vector, X is a (n x p) matrix with its first column...

    Started by alias‎, 11-13-2011 03:34 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 14,506
    11-14-2011, 02:40 AM Go to last post
  29. variance of binomial distribution

    The variance of a binomial distribution for which n = 100 and p = 0.20 is this is a practice problem for a test im taking next week. But i don't...

    Started by laneswilets‎, 02-23-2009 08:18 PM
    • Replies: 1
    • Views: 14,493
    02-23-2009, 09:46 PM Go to last post
  30. E(X) , Cov(aX,bY)

    Let X and Y be random variables with the density f(x) such that f(X)=1 for 0<x<1 and f(x)=0 for x<0 and x>1. We have that Var(x) = Var(Y). 1)...

    Started by saternal‎, 04-23-2012 10:14 AM
    • Replies: 12
    • Views: 14,173
    04-24-2012, 08:52 PM Go to last post
  31. find the expected value of continuous random vaiable

    Hi, To find the expected value of a continous random variable I normally integrate the pdf multiplied by the random variable over the range of the...

    Started by PeterVincent‎, 11-17-2009 04:13 PM
    • Replies: 10
    • Views: 14,136
    11-20-2009, 07:05 AM Go to last post
  32. Can't figure out probability question...

    Ok, so I'm completely lost in my Statistics class and I really need help on this problem. I think if I figure this one out, it will help with the...

    Started by statshelp31‎, 10-19-2009 09:00 PM
    • Replies: 1
    • Views: 14,111
    10-20-2009, 10:52 AM Go to last post
  33. 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: 14,093
    01-03-2011, 04:58 PM Go to last post
  34. Method of Moments, MLEs, and Standard Errors

    Hi, I have a question about standard errors in the context of this problem. Any help would be greatly appreciated: Suppose X is a discrete random...

    Started by sweetpotatofry‎, 02-05-2010 01:13 PM
    • Replies: 13
    • Views: 13,999
    02-07-2010, 04:13 PM Go to last post
  35. technical VS biological replicates (compare means)

    Hi, I have conducted an experiment with an assay for 2 biological classes, each consisting of 10 unique members. I did the assay 3 times for a...

    Started by endocardium‎, 07-17-2010 11:54 PM
    • Replies: 4
    • Views: 13,992
    07-18-2010, 05:49 PM Go to last post
  36. Joint PDF problem

    Hey folks, I've got a problem with a joint probability density function question. Given f(x, y) = 6(x^2)y for 0 <= x <= y, x + y <= 2 and 0...

    Started by Halfpixel‎, 10-21-2008 10:27 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 13,904
    10-13-2010, 05:20 PM Go to last post
  37. Difficult Integral standard normal pdf/cdf

    I would like to get an explicit analytical form for the integral (below)...or something close to it with an associated (small) error term. (Note that...

    Started by Dragan‎, 05-28-2010 11:37 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 13,881
    05-31-2010, 09:35 AM Go to last post
  38. Minimum of 2 Random Variables question

    R(1) and R(2) are 2 independent random variables with same density function f(x) = x*(e^(-.5 * x^2)) for x >= 0. Find the density of Y = min{R(1),...

    Started by StatStudent3‎, 11-04-2010 05:27 PM
    • Replies: 7
    • Views: 13,805
    11-05-2010, 11:13 PM Go to last post
  39. Sample mean and variance of dependent random variables

    The sample mean and variance of independent random variables are mean = E(X) variance = Var(X)/n What if the random variables are dependent? ...

    Started by shrek‎, 07-09-2008 01:41 PM
    • Replies: 1
    • Views: 13,424
    07-10-2008, 03:57 AM Go to last post
  40. Calculating probability of multiple events

    This is my first post so I hope I can get my question across reasonably intelligently. I have calculated the probability of an event occurring for...

    Started by Bear47‎, 11-18-2008 10:12 AM
    • Replies: 3
    • Views: 13,415
    11-26-2008, 05:24 AM Go to last post
  41. 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: 13,346
    09-27-2010, 06:34 AM Go to last post
  42. Need lots of help - Binomial Probabilities

    I completely confused on this my problem is this: Richard has just been given a 10 question multiple-choice quiz in his history class. Each...

    Started by CheriHagans‎, 11-16-2005 10:18 PM
    • Replies: 2
    • Views: 13,223
    11-16-2005, 10:29 PM Go to last post
  43. introduction to stochastic process by by Hoel, Port and Stone.

    those any one have this text. i have gone through all the questions in chapter 1 except for two prove questions. no 27 and 26 i am lost

    Started by colltie‎, 01-26-2009 11:40 AM
    • Replies: 6
    • Views: 13,100
    07-16-2010, 02:05 PM Go to last post
  44. probability of liscense plate

    What is the probability of getting a license plate that has a repeated letter or digit if you live in a state where the scheme is three letters...

    Started by agclifto‎, 10-05-2007 05:57 PM
    • Replies: 1
    • Views: 12,996
    10-06-2007, 08:21 AM Go to last post
  45. 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: 12,963
    01-04-2011, 10:09 AM Go to last post
  46. I need some help, please

    Hi, I have found some difficulty in solving this exercise. HINT: Use the fact that T/σ^2~chi-squared (n-1) and the moments of the chi-squared...

    Started by Fahad Alqahtani‎, 11-13-2010 04:19 PM
    2 Pages
    1 2
    • Replies: 28
    • Views: 12,890
    11-13-2013, 04:10 PM Go to last post
  47. Red face Determining Joint PDFs, and Marginal PDFs

    Hi All, I'm going through revision questions, and I am stuck on this particular section all with similar questions. If somebody can give me a guide...

    Started by woody198403‎, 05-09-2008 02:50 AM
    • Replies: 13
    • Views: 12,868
    05-15-2008, 01:04 AM Go to last post
  48. Law of Total Expectation

    The law of total expectation states that: E(X) = E and E = Eg(X)|Y)] 1) Now, is it correct to say that E(XY)=EXY|Y)] ? I don't think the above...

    Started by kingwinner‎, 11-16-2009 02:09 AM
    • Replies: 10
    • Views: 12,744
    11-18-2009, 02:28 AM Go to last post
  49. Maximum likelihood estimator question with discrete uniform distribution

    Q. A bag contains sequentially numbered lots (1,2...N). Lots are drawn at random (each lot has the same probability of being drawn). Two lots are...

    Started by languagelearner23‎, 03-06-2011 07:40 AM
    • Replies: 9
    • Views: 12,704
    03-06-2011, 01:15 PM Go to last post
  50. Cumulative Beta Distribution Function Help

    Hi everyone, I was wondering if someone could help me figure out how this function works. My problem is not that I need homework help, it's that...

    Started by idkstats14‎, 12-22-2010 02:21 PM
    • Replies: 13
    • Views: 12,608
    05-05-2014, 04:07 AM Go to last post
  51. Relation between n, p, q, and sigma

    I know the value of n and p. I am looking for the standard deviation and mean based on those values. I gather that the forumla for sigma, the...

    Started by ideaessence‎, 06-07-2010 04:48 PM
    • Replies: 1
    • Views: 12,589
    06-07-2010, 04:52 PM Go to last post
  52. Cup and ball game: what are the odds of that?

    OK we are having an intelectual discussion (no, really) about the change in odds during the classic cup and ball game. To explain: a dealer has...

    Started by bonedoctor‎, 02-22-2010 06:27 PM
    • Replies: 2
    • Views: 12,551
    02-22-2010, 08:00 PM Go to last post
  53. Hypergeometric Probabilities

    These are similar in principle to the binomial distribution, with one major exception - the hypergeometric probability is for situations where you...

    Started by JohnM‎, 02-20-2006 11:59 AM
    • Replies: 0
    • Views: 12,545
    02-20-2006, 11:59 AM Go to last post
  54. Probability of coincidence ?

    Probability of coincidence ? (WARNING... resolving this problem may force upon you world fame and extreme wealth) I basically don't know where to...

    Started by RobAbility‎, 02-19-2014 05:06 PM
    3 Pages
    1 2 3
    • Replies: 40
    • Views: 12,491
    02-27-2014, 09:21 PM Go to last post
  55. Odds of birthday on same day

    I'm confused about the following... Two people have their birthday on a specific day of the year. Are the odds 1:365 or 1:730 ? :confused: ...

    Started by MrConfused‎, 02-17-2010 06:08 PM
    • Replies: 7
    • Views: 12,482
    02-18-2010, 04:09 PM Go to last post
  56. Probability Concepts Homework Help!!

    Hi, I have been struggling with this question for the past few days now and still can't seem to figure it out. If anyone can help me and show me...

    Started by will023‎, 02-23-2010 03:09 PM
    • Replies: 7
    • Views: 12,457
    02-24-2010, 12:51 PM Go to last post
  57. 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: 12,407
    01-03-2011, 11:10 AM Go to last post
  58. Is P(A n B) the same as P(B n A)?

    As the topic says. If we have two events A and B respectively, is it possible that P(A n B) != P(B n A)? This isn't a homework question but its...

    Started by c2q‎, 10-05-2010 03:24 PM
    • Replies: 1
    • Views: 12,385
    10-05-2010, 03:44 PM Go to last post
  59. Discrete Probability

    Hello all. I recently became a member on this forum. Hope to learn many new things from here and in my statistics course in college. I am still...

    Started by discgolfer87‎, 02-23-2011 07:43 PM
    • Replies: 1
    • Views: 12,324
    02-24-2011, 12:06 AM Go to last post
  60. 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: 12,254
    03-21-2011, 10:53 PM Go to last post

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