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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: 30,190
    09-30-2005, 09:44 AM Go to last post
  1. Will someone please help a lost Engineer?

    I am trying to finish my thesis for my Masters in Civil Engineering and have run into a statistics/ probability question which my one Engineering...

    Started by Civil Eng.‎, 02-05-2009 12:20 AM
    • Replies: 6
    • Views: 2,739
    02-05-2009, 06:45 PM Go to last post
  2. Will two Independent Variables transformed into two functions remain independent?

    X & Y are independent variables. X ~ Bernoulli(1/2), Y ~ Bernoulli(1/3). Let Z = X + Y and W = X - Y. Compute Cov(Z,W) and Corr(Z,W). Am I...

    Started by simplemts‎, 10-07-2012 05:56 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,028
    10-07-2012, 11:36 PM Go to last post
  3. win money

    A man won money when he bet unsuspecting patrons that in 4 rolls of a die, he could get at least one six, but he lost money when he bet that in 24...

    Started by Whitney‎, 10-04-2006 11:36 PM
    • Replies: 1
    • Views: 2,048
    10-05-2006, 06:47 AM Go to last post
  4. Wine tasting - random selection

    Can you tell me if my reasoning is correct, please. If I'm mistaken, please explain why. If I am correct, can you tell me another way to look at...

    Started by mrmac‎, 12-02-2012 06:26 PM
    • Replies: 1
    • Views: 918
    12-02-2012, 06:27 PM Go to last post
  5. wishart distribution and correlation matrix???

    hey there everyone! just a quick question.... you see how the sampling distribution of the covariance matrix follows a wishart distribution (for...

    Started by will22‎, 03-22-2011 02:10 PM
    • Replies: 7
    • Views: 8,937
    09-16-2013, 03:01 AM Go to last post
  6. Word problem needs double checking.

    There are 10 seniors, 8 juniors, 5 sophomores and 3 frshman on student council. A committee of 6 members is formed. a.p(all seniors) b.p(3...

    Started by ethunnn‎, 03-30-2013 10:04 PM
    • Replies: 2
    • Views: 1,463
    05-10-2013, 02:16 PM Go to last post
  7. word problems

    Here are a few more questions that I got wrong and need help figuring out if anyone could help. Question 1: The length of time for students to...

    Started by orangeb‎, 02-08-2006 07:57 AM
    • Replies: 3
    • Views: 4,042
    05-19-2006, 12:21 PM Go to last post
  8. Working out probability for this game

    Rather confusing game ive started playing in the streets. I've been making alot of money from a game called high dice. A 6 sided dice is rolled...

    Started by exsert‎, 12-28-2011 09:42 PM
    • Replies: 2
    • Views: 1,602
    12-31-2011, 10:05 PM Go to last post
  9. Working out the probability of each participant in a 400 metre race

    I have an opinion on what time I think each participant in a 400 metre race would achieve but I want to turn this opinion in to probabilities for...

    Started by adam2308‎, 12-28-2011 02:33 PM
    • Replies: 1
    • Views: 1,753
    12-28-2011, 03:21 PM Go to last post
  10. World Cup - a simple probability question

    Hi All I hope this is not considered too far outside the purpose or spirit of this site! I haven't touched statistics since doing A level...

    Started by chrishayes‎, 06-08-2006 07:07 AM
    • Replies: 2
    • Views: 2,546
    06-21-2006, 10:50 AM Go to last post
  11. Would love some assistance with understanding this puzzling probability "game"

    Hello everyone, This is my first post here, so please be gentle :). I'd like to thank everyone in advance for any help that can be given. ...

    Started by Habanero‎, 07-05-2014 12:25 AM
    • Replies: 3
    • Views: 1,601
    07-05-2014, 06:18 PM Go to last post
  12. Unhappy would some one confirm my answers

    1-Many universities require a student to take a math placement test as well as computer science placement test.80% of the students who take both...

    Started by stat help‎, 02-29-2008 08:37 PM
    • Replies: 2
    • Views: 2,079
    03-01-2008, 05:06 PM Go to last post
  13. Writing a book - need help!

    I am writing a book on double deck pinochle and need to get accurate percentages. I am hoping this forum is willing and able to help me! If I am in...

    Started by rakbeater‎, 08-01-2010 08:31 PM
    • Replies: 8
    • Views: 3,929
    08-05-2010, 12:21 AM Go to last post
  14. X + a log X, where X~Gamma

    Does anybody know anything about the distribution of X + a log X, where X is a gamma distributed random variable and a is constant?

    Started by pnoviko‎, 02-08-2009 11:29 AM
    • Replies: 7
    • Views: 3,919
    02-09-2009, 12:45 PM Go to last post
  15. X and Y is independent. I didn't say that X and Y is conditional independent given Z.

    X and Y is independent. (Note that I didn't say that X and Y is conditional independent given Z.) Still pr(X|Z) * pr(Y|Z) = pr(XY|Z) is always...

    Started by kdc09072‎, 04-24-2012 08:50 PM
    • Replies: 1
    • Views: 2,311
    04-25-2012, 02:34 AM Go to last post
  16. X=0 almost surely => E(X)=0

    Axioms of expectation: 1. X>0 => E(X)>0 2. E(1)=1 3. E(aX+bY) = aE(X) + bE(Y) 4. If X_n is a nondecreasing sequence of numbers and lim(X_n) = X,...

    Started by kingwinner‎, 07-07-2009 10:05 PM
    • Replies: 14
    • Views: 4,513
    07-20-2009, 12:59 AM Go to last post
  17. Xn~Exponential(.5) -> Xn~Normal. Use Chebychev's inequality

    Xn are iid Exponential(.5). After using the central limit theorem, Xn is Normally distributed. Use chebychev's inequality to find out how large n be...

    Started by phychoflip29‎, 10-15-2012 04:57 PM
    chebychev's inequality, exponential, normal
    • Replies: 6
    • Views: 2,254
    10-20-2012, 03:01 PM Go to last post
  18. 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: 6,346
    12-05-2010, 05:27 PM Go to last post
  19. Question Yes/No Survey mean?

    This is the questions I know how to do it but I dont know how I would figure out the mean for this, which is needed to find the confidence level. ...

    Started by rajuthan‎, 11-04-2009 12:03 AM
    • Replies: 5
    • Views: 11,769
    02-03-2010, 12:44 AM Go to last post
  20. Yet (another) derivation from linear mixed effects regression...

    hello there... first of all, thank you very much to everyone who has replied to my questions and has helped me understand these things a little bit...

    Started by will22‎, 09-26-2011 09:37 AM
    • Replies: 3
    • Views: 2,022
    09-28-2011, 08:07 PM Go to last post
  21. Yet another "flipping" coin problem

    Hi folks, So we flip two balanced coins. If at least one of them shows tails what is the probability that the other coin is also tails? My answer:...

    Started by ramrad‎, 04-12-2011 01:27 PM
    • Replies: 4
    • Views: 3,497
    04-12-2011, 08:15 PM Go to last post
  22. Exclamation Yet more problems!!!

    OK. Like I said. I am really struggling with this. Here are two more I can't grasp. 1. You are fishing at a Reservoir. The Department of...

    Started by jjmeans‎, 04-15-2006 07:08 PM
    • Replies: 0
    • Views: 2,071
    04-15-2006, 07:08 PM Go to last post
  23. Yikes help!

    There are two boxes, Box A and Box B. • Box A contains seven $1 tags, six $5 tags, four $10 tags, two $15 tags, and one $20 tag. • Box B contains...

    Started by kmulcahy526‎, 06-06-2008 09:05 AM
    • Replies: 0
    • Views: 1,756
    06-06-2008, 09:05 AM Go to last post
  24. z and standard normal variable...

    I have a question on my homework...I'm not looking for the answer, just how to find it... If Z is a standard normal variable how would you find the...

    Started by jochowschmoley@yahoo.com‎, 12-10-2007 02:25 PM
    • Replies: 1
    • Views: 3,289
    12-10-2007, 02:49 PM Go to last post
  25. Z score question

    Hello there was wondering if someone could help shed some light on this question for me..any help would be greatly appreciated.. The mean height...

    Started by nat9‎, 09-02-2006 08:07 AM
    • Replies: 3
    • Views: 3,520
    09-03-2006, 08:52 AM Go to last post
  26. Z scores .. please help

    there is two problems that i can answer .. 1) Processing of the ceramic alloy involves a sintering ( firing ) process which produces a dense hard...

    Started by paul2009‎, 01-03-2010 02:10 PM
    • Replies: 4
    • Views: 3,066
    01-06-2010, 02:00 PM Go to last post
  27. Z Scores Probabilty...Can anyone help?

    Hey, Here is the question, I need some serious help!!!! A soft drink machine can be regulated so that it discharges and average of µ per cup. If...

    Started by spoochie1‎, 03-03-2008 08:18 PM
    • Replies: 4
    • Views: 2,140
    03-10-2008, 08:51 AM Go to last post
  28. z standard normal

    First part of the question asks..if X is normal with mean = 8.48 and sd = 1.6, what are the 2 values of X which include central 80% of probability? ...

    Started by citibankak‎, 04-11-2008 12:21 AM
    • Replies: 1
    • Views: 5,426
    04-11-2008, 07:18 AM Go to last post
  29. Z Table Lookup Question

    I have the following practice question: P(-3.80<z<-2.40) Why is the answer .0081? How do I find that?

    Started by stat_K‎, 09-02-2006 03:13 PM
    • Replies: 2
    • Views: 3,038
    09-02-2006, 06:00 PM Go to last post
  30. Z tables

    Can someone tell me what Z upper and Z lower values are? I am trying to find theoretical parts out of spec. The specifications are -.30 to .30 with...

    Started by cholloway‎, 01-10-2006 10:22 PM
    • Replies: 5
    • Views: 6,664
    01-12-2006, 12:31 PM Go to last post
  31. Z test

    Hi , i have a question regarding z test and testing at 5% level. If sample size is 60 S=11.7 X=42.8 and i use formula Z= X-mu ...

    Started by el1‎, 04-22-2008 06:11 PM
    • Replies: 3
    • Views: 1,896
    04-22-2008, 07:06 PM Go to last post
  32. Z-score from a negative x value

    Hello, I am trying to calculate the z-score for a normal random variable(x), which has a negative value. I know the formula. If x < 3.4 the mu...

    Started by BernardW‎, 11-19-2013 07:08 PM
    normal random variables
    • Replies: 1
    • Views: 2,522
    11-19-2013, 08:58 PM Go to last post
  33. Exclamation Z-scores & Central Limit Theory

    I have been trying to work on my stats for a right long time now. I can't figue out this one question in my textbook. I don't understand or even know...

    Started by nursing101‎, 11-05-2010 07:03 PM
    • Replies: 1
    • Views: 6,729
    11-05-2010, 08:04 PM Go to last post
  34. Z-scores for probability in tails

    I haven't done any stats in years and now I am in a course for my grad program and I am so lost. My teacher is very confusing and I am trying my best...

    Started by rmbr2‎, 10-02-2008 01:18 PM
    • Replies: 3
    • Views: 23,888
    10-16-2008, 06:45 AM Go to last post
  35. z-test for a proportion

    Please help... Lets say that I have developed a new method and software prototype that aims to significantly reduce the ambiguity inherent in...

    Started by Steve‎, 05-29-2008 06:59 AM
    • Replies: 1
    • Views: 4,088
    05-29-2008, 07:40 AM Go to last post
  36. Z-values and probability

    Suppose concentration of arsenic (in ppb) in groundwater sampled quarterly from a particular well can be modeled with a normal distribution with a...

    Started by chickennugget‎, 03-09-2014 07:30 PM
    probability homework help
    • Replies: 0
    • Views: 1,313
    03-09-2014, 07:30 PM Go to last post
  37. zero inflated poisson distribution

    I am new and I hope I'm abiding to the rules. I just wanted to know what exactly a zero inflated Poisson distribution is? How is it related to the...

    Started by mekhi‎, 03-16-2010 05:32 AM
    • Replies: 2
    • Views: 6,378
    03-16-2010, 09:21 AM Go to last post
  38. zmoggggg -- Continuation of Poisson question, please verify and advise

    ok so lambada value here =4 (Average of 240 planes in 1 hr) and for the following question a) atleast 1 plane arrives during the 10-minute...

    Started by sahilkthr‎, 11-06-2008 11:37 AM
    • Replies: 2
    • Views: 2,158
    11-06-2008, 01:50 PM Go to last post
  39. Ztable probability, Please Help

    Im looking back over an old assignment and I cant figure out how to get the correct probability Question: what is the probability of encountering...

    Started by cmf0106‎, 10-26-2008 02:14 PM
    • Replies: 3
    • Views: 2,250
    10-26-2008, 02:37 PM Go to last post
  40. [ASK] Combination: Am I Doing This Right?

    Among 10 candidates of Students Council members, 3 people will be selected to undergo training. The number of possible ways to do so if 1 candidate...

    Started by Monox D. I-Fly‎, 02-14-2015 02:01 AM
    • Replies: 2
    • Views: 1,491
    02-17-2015, 10:06 PM Go to last post
  41. [ASK] Combination?

    5. A bag contains 7 red marbles and 5 yellow marbles. From the bag, 3 marbles are taken randomly at once. How many ways exist if all 3 taken marbles...

    Started by Monox D. I-Fly‎, 03-10-2015 09:56 PM
    • Replies: 0
    • Views: 1,018
    03-10-2015, 09:56 PM Go to last post
  42. [ASK] Doctrine of Chances by Abraham de Moivre

    Doctrine of Chance is a book published by Abraham de Moivre in 1718. It was on the sbuject of probability containing many innovations such as method...

    Started by Monox D. I-Fly‎, 01-09-2015 10:29 PM
    • Replies: 0
    • Views: 1,624
    01-09-2015, 10:29 PM Go to last post
  43. [Discrete Probability Function] P(X²=1)= P(X=1) U P(X=-1)?

    I would like to know if this following form of interpretation is correct: ========================== Suppose I have a discrete probability...

    Started by Ardêncio‎, 04-18-2017 08:47 AM
    • Replies: 1
    • Views: 1,040
    04-18-2017, 09:18 AM Go to last post
  44. [Gamma Distribution] Generate random number according to Gamma Distribution

    Hi, I request your help / suggestion to solve the following problem Suppose X_i, i=1,2,...,n are exponential RVs with mean 1/k. If the triggering...

    Started by shawonsaki‎, 10-23-2012 09:28 PM
    gamma distribution
    • Replies: 3
    • Views: 2,167
    10-25-2012, 03:54 AM Go to last post
  45. [Homework help] Binomial distribution questions

    After the BP oil crisis in the Gulf, sixty percent of Americans are in favor of the government’s moratorium on deepwater oil drilling. Out of the...

    Started by Tote6000‎, 09-02-2010 09:07 PM
    • Replies: 9
    • Views: 4,162
    09-03-2010, 04:47 PM Go to last post
  46. [Likelihood of embedded Markov chain] Likelihood of Goldman Yang (GY) rate matrix

    This question concerns defining the likelihood of a set of parameters in a rate matrix of an embedded Markov chain. To get a brief idea of the...

    Started by smib‎, 12-17-2012 11:52 AM
    biology, likelihood, markov chains
    • Replies: 0
    • Views: 1,426
    12-17-2012, 11:52 AM Go to last post
  47. Question [Question] "Supermatch" cards problem

    Dear everyone, I have a question that i couldn't figure out clearly. Here is it. Here will i write down what i have been done, and please...

    Started by ilhamdoank‎, 10-24-2011 05:44 PM
    exclusion, inclusion, probability
    • Replies: 1
    • Views: 2,316
    10-25-2011, 02:07 AM Go to last post
  48. Question [Question] Birthday Problem

    Here is the problem, I already get the answer, \frac{r}{365 -365(\frac{364}{365})^s} What do you think?

    Started by ilhamdoank‎, 10-26-2011 11:33 AM
    birthday problem, probability
    • Replies: 1
    • Views: 2,431
    10-26-2011, 12:04 PM Go to last post
  49. [URGENT] TrickY problem about conditional probability

    1) Consumer in a supermarket, 20% buy 10 items or less, 70% spend more than $ 10, and 68% spend less than 10 dollars and buy more than 10 items. what...

    Started by JorgeMC‎, 11-01-2010 08:12 PM
    • Replies: 2
    • Views: 3,621
    11-09-2010, 04:34 PM Go to last post

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