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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: 30,184
    09-30-2005, 09:44 AM Go to last post
  1. [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: 3,619
    11-09-2010, 04:34 PM Go to last post
  2. 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: 2,429
    10-26-2011, 12:04 PM Go to last post
  3. 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: 2,315
    10-25-2011, 02:07 AM Go to last post
  4. [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: 1,424
    12-17-2012, 11:52 AM Go to last post
  5. [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: 4,161
    09-03-2010, 04:47 PM Go to last post
  6. [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: 2,166
    10-25-2012, 03:54 AM Go to last post
  7. [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: 1,038
    04-18-2017, 09:18 AM Go to last post
  8. [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: 1,623
    01-09-2015, 10:29 PM Go to last post
  9. [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
  10. [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: 1,488
    02-17-2015, 10:06 PM Go to last post
  11. 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
  12. 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: 2,156
    11-06-2008, 01:50 PM Go to last post
  13. 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: 6,375
    03-16-2010, 09:21 AM Go to last post
  14. 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: 1,312
    03-09-2014, 07:30 PM Go to last post
  15. 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: 4,087
    05-29-2008, 07:40 AM Go to last post
  16. 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: 23,882
    10-16-2008, 06:45 AM Go to last post
  17. 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: 6,726
    11-05-2010, 08:04 PM Go to last post
  18. 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: 2,520
    11-19-2013, 08:58 PM Go to last post
  19. 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: 1,891
    04-22-2008, 07:06 PM Go to last post
  20. 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: 6,659
    01-12-2006, 12:31 PM Go to last post
  21. 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: 3,036
    09-02-2006, 06:00 PM Go to last post
  22. 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: 5,424
    04-11-2008, 07:18 AM Go to last post
  23. 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
  24. 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
  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: 3,517
    09-03-2006, 08:52 AM Go to last post
  26. 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: 3,286
    12-10-2007, 02:49 PM Go to last post
  27. 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: 1,755
    06-06-2008, 09:05 AM Go to last post
  28. 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: 2,070
    04-15-2006, 07:08 PM Go to last post
  29. 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: 3,493
    04-12-2011, 08:15 PM Go to last post
  30. 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: 2,021
    09-28-2011, 08:07 PM Go to last post
  31. 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: 11,761
    02-03-2010, 12:44 AM Go to last post
  32. 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: 6,339
    12-05-2010, 05:27 PM Go to last post
  33. 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
  34. 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: 4,510
    07-20-2009, 12:59 AM Go to last post
  35. 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: 2,309
    04-25-2012, 02:34 AM Go to last post
  36. 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: 3,916
    02-09-2009, 12:45 PM Go to last post
  37. 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: 3,924
    08-05-2010, 12:21 AM Go to last post
  38. 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
  39. 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: 1,600
    07-05-2014, 06:18 PM Go to last post
  40. 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: 2,545
    06-21-2006, 10:50 AM Go to last post
  41. 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: 1,751
    12-28-2011, 03:21 PM Go to last post
  42. 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
  43. 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: 4,041
    05-19-2006, 12:21 PM Go to last post
  44. 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: 1,461
    05-10-2013, 02:16 PM Go to last post
  45. 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: 8,930
    09-16-2013, 03:01 AM Go to last post
  46. 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
  47. 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
  48. 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: 3,025
    10-07-2012, 11:36 PM Go to last post
  49. 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: 2,738
    02-05-2009, 06:45 PM Go to last post
  50. Question Will rounding off Standard Deviation Bins cause error on Histogram?

    I am creating a Histogram. I have about 100 points of data and I am using MS Excel's Histogram function to create the "Bins". The data points I have...

    Started by andygarcia‎, 06-25-2010 10:04 AM
    • Replies: 4
    • Views: 6,657
    06-30-2010, 11:34 AM Go to last post
  51. Will passing the Actuarial Exam 1/P help in other professions?

    I wasn't sure what other thread to ask this in, so I figured probability was relevant. I've been studying for the 1st actuarial exam 1/P for a year,...

    Started by Shaq's Left Nut‎, 10-23-2012 11:49 AM
    • Replies: 1
    • Views: 1,215
    10-23-2012, 11:55 AM Go to last post
  52. Will decision on H0 depend on Ha

    In testing of hypthesis , will the decision of whether to accept or reject depend on the tail of the test ? That is suppose Ha M<0 and Ha!=0. In...

    Started by jeevanbmanoj‎, 11-30-2011 11:07 PM
    • Replies: 3
    • Views: 2,248
    12-01-2011, 02:02 AM Go to last post
  53. 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: 2,987
    09-20-2010, 08:42 AM Go to last post
  54. Wigan scores after 30 minutes. Calculate home, away and draw in percentage terms.

    Wigan V City Wigan scores after 30 minutes. Calculate home, away and draw in percentage terms. Please advise how to proceed with this question...

    Started by Poisson1‎, 01-10-2013 10:54 AM
    • Replies: 8
    • Views: 1,917
    01-14-2013, 06:46 PM Go to last post
  55. Wink Why this Frequency Polygon is not correct?

    Hi guys! I stumbled upon this blurry question from one of my lab old exams, in statistics elective course. I will leave you to check the...

    Started by modo‎, 10-21-2014 02:40 AM
    frequency polygon
    • Replies: 0
    • Views: 930
    10-21-2014, 02:40 AM Go to last post
  56. why this equation is correct?

    Anybody can tell me why this equation is correct? \sum^{n}_{s=k} {n\choose s}\textit{P}\{X(t)\geq j\}^{s}\textit{P}\{X(t) <...

    Started by Target‎, 07-07-2012 07:07 AM
    • Replies: 7
    • Views: 2,367
    07-08-2012, 02:48 AM Go to last post
  57. why should the I use a t distribution? (theory question)

    Hello I would like some help with the theory behind the t-test. I know how to technically perform a t-test but something in the logic doesn't add...

    Started by gargy‎, 05-19-2010 05:44 AM
    • Replies: 5
    • Views: 7,320
    05-19-2010, 01:15 PM Go to last post
  58. Why is this question not Binomial?

    Hi, "A fair coin is tossed three times. What is the probability of two or more heads, given that there was at least one head?" Why is this not...

    Started by S-C-3-1-3‎, 01-15-2013 10:47 AM
    • Replies: 1
    • Views: 1,024
    01-15-2013, 12:29 PM Go to last post
  59. Why is a Dynkin system not a Pi-system?

    This appears to be the only difference between a sigma-algebra and a Dynkin system: Sigma-algebra is closed under countable union Dynkin system...

    Started by tuna‎, 05-25-2012 08:59 AM
    algebra, dynkin, pi-system, sigma
    • Replies: 0
    • Views: 1,602
    05-25-2012, 08:59 AM Go to last post
  60. Why doesent MLE equal in normal distribution when mean = variance?

    Sadly I´m not familiar with LaTex so I have attached my question as a picture. I have tried the best I can, but now I´m stuck :(

    Started by pmle‎, 03-10-2016 11:47 AM
    • Replies: 11
    • Views: 1,853
    03-12-2016, 01:24 AM Go to last post

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