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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: 30,238
    09-30-2005, 09:44 AM Go to last post
  1. Hypergeometric Probablility

    I have a question here, bit of an old one and there have been a lot of examples about it before but I couldn't find any solutions. Its goes as such:...

    Started by Mikey D‎, 01-21-2007 12:52 PM
    • Replies: 0
    • Views: 3,299
    01-21-2007, 12:52 PM Go to last post
  2. Probability

    Two Questions 1. Number of units sold 0 1 2 3 4 5 Probabiltiy of units .1 .15 .2 .35 ...

    Started by Scott‎, 01-24-2007 10:20 AM
    • Replies: 2
    • Views: 3,150
    01-25-2007, 10:52 AM Go to last post
  3. Multiple normal distributions

    Post removed.

    Started by bcs‎, 01-26-2007 07:04 PM
    • Replies: 0
    • Views: 2,759
    01-26-2007, 07:04 PM Go to last post
  4. Probability

    I have been working on this problem for a couple of hours. :confused: From a survey of Americans, it was found that 65% of the respondents do not...

    Started by tmwawa‎, 01-27-2007 02:27 PM
    • Replies: 2
    • Views: 2,290
    01-28-2007, 11:30 AM Go to last post
  5. need help with a handful of question

    Hello.. I just found this site and I was wondering if you guys could help me. I've never been very good at stats and I've been working on questions...

    Started by BrianS‎, 01-25-2007 03:38 PM
    • Replies: 3
    • Views: 2,566
    01-28-2007, 11:48 AM Go to last post
  6. Complements, Unions, and Intersections

    Help!:shakehead In a market research survey participants were asked if they put ketchup directly on their fries or along side. 26% of men said...

    Started by tmwawa‎, 01-28-2007 12:09 PM
    • Replies: 4
    • Views: 4,198
    01-28-2007, 01:57 PM Go to last post
  7. Weighted sums of random variables

    In an effort to determine the expected return of two stocks (A and B), I'm instructed in my homework to use the formula Y=a(subscript)1 X(sub)1 +...

    Started by Quentin‎, 01-15-2007 09:59 PM
    • Replies: 1
    • Views: 3,232
    01-28-2007, 04:03 PM Go to last post
  8. probaliblity question

    a producer of a fruit drink advertises it contains 10% real fruit juices. A sample of 75 bottles are analyzed and it's found that only 6.6% is real...

    Started by BrianS‎, 01-28-2007 12:22 PM
    • Replies: 1
    • Views: 2,249
    01-28-2007, 04:27 PM Go to last post
  9. Gambling Theory / Martingale

    Is anyone here familiar with gambling theory? If so, is the Martingale system a viable betting strategy where P(w) > .5, say .5061. Does anyone...

    Started by mchesnu‎, 01-28-2007 09:31 PM
    • Replies: 0
    • Views: 1,962
    01-28-2007, 09:31 PM Go to last post
  10. Unhappy Finished report...convinced its wrong!

    Hi! I've finished a report type thing that use a normal distribution table. However I'm convinced my answers are wrong :S although i hope theyre...

    Started by NCLHev‎, 01-10-2007 05:21 PM
    • Replies: 1
    • Views: 2,442
    01-29-2007, 04:53 AM Go to last post
  11. Smile Poisson/Binomial - Conclusions Based on a Small Sample

    Any help with the problem below is greatly appreciated. :wave: I have 100 days of observations of a geyser. In those 100 days, the geyser shot...

    Started by jchen123456789‎, 01-27-2007 04:38 PM
    • Replies: 2
    • Views: 3,545
    01-30-2007, 10:10 PM Go to last post
  12. Permutation Problem - help me understand pls!

    I am reading this example about permutation and can't understand how to go about rationalize it. Example: Suppose that 2 anthropology, 4 computer...

    Started by gavinwkc‎, 01-30-2007 04:44 AM
    • Replies: 1
    • Views: 5,886
    01-31-2007, 06:17 AM Go to last post
  13. A probability/stat elementary problem

    Hi, I am currently reviewing probabilities on my own and encountered problems which i can't seem to do. Hopefully someone here will be kind enough to...

    Started by gavinwkc‎, 01-29-2007 11:42 AM
    • Replies: 2
    • Views: 4,464
    01-31-2007, 01:54 PM Go to last post
  14. Conditional probability...

    ------- Jose and Jim go duck hunting together. Suppose that Jose hits the target with a probability 0.3 and Jim, independently, with a probability...

    Started by haywire‎, 01-29-2007 08:46 PM
    • Replies: 1
    • Views: 3,662
    01-31-2007, 06:17 PM Go to last post
  15. Question Conditional Probability

    I have been working on this problem for two hours and i can't seem to get it right! 28 crayons, 4 are red. they are divided among 4 people evenly....

    Started by Katy423‎, 02-02-2007 03:13 PM
    • Replies: 0
    • Views: 1,814
    02-02-2007, 03:13 PM Go to last post
  16. Question about use of Poisson probabilities

    I work for a firm that compiles a database of license plate numbers, some of which correspond to cars that flunk roadside emissions testing. We ...

    Started by villandra‎, 02-03-2007 08:45 PM
    • Replies: 0
    • Views: 2,611
    02-03-2007, 08:45 PM Go to last post
  17. Crazy union/intersection question.

    Paul will be taking three exams - call them A, B and C. You are given: -It is certain that he will pass at least one exam. -The probability that...

    Started by stedwick‎, 02-05-2007 02:58 AM
    • Replies: 1
    • Views: 2,839
    02-05-2007, 12:17 PM Go to last post
  18. Sample correlation

    Im in desperate need and im stuck: Can someone plsease tell me where im going wrong with this question. Calculate the sample correlation between...

    Started by sweetx‎, 02-02-2007 10:13 AM
    • Replies: 2
    • Views: 2,398
    02-05-2007, 12:28 PM Go to last post
  19. Easy problem, has me stumped, addition rule?

    This has me stumped, possibly because the notes i took did not make sense to me, I may have it right, and if not, please correct me :] In a pop....

    Started by remyg‎, 02-05-2007 07:05 PM
    • Replies: 2
    • Views: 2,626
    02-05-2007, 11:05 PM Go to last post
  20. Distributions

    Hello there, Finally got the hang of the this from by using my Excel. Although, I would love to do by the formula method. Im not sure what...

    Started by rkslperez‎, 02-05-2007 03:04 PM
    • Replies: 1
    • Views: 2,885
    02-06-2007, 07:45 AM Go to last post
  21. Question Exception Rate Prediction

    I have a piece of software which logs a successful transaction with a particular code of S and a failure/exception with a code of E. The software...

    Started by coowboy‎, 02-02-2007 12:08 PM
    • Replies: 1
    • Views: 2,946
    02-06-2007, 07:15 PM Go to last post
  22. Probability and time

    Hi This is not a homework question, alas school and university are many years ago for me; but I was wondering how you account for time when using...

    Started by Andrewbond‎, 04-14-2007 06:59 PM
    • Replies: 0
    • Views: 2,170
    04-14-2007, 06:59 PM Go to last post
  23. prob question

    I have a 3 part question and I think i've got the first 2 parts but i'm stuck on third. it's: there is a cabin that has a probability of.05 of being...

    Started by mir5002‎, 04-16-2007 01:08 PM
    • Replies: 1
    • Views: 2,172
    04-17-2007, 07:42 AM Go to last post
  24. help

    for df=15 find the value(s) of t associated with each of the following a) the top 5 % of the distribution b) the middle 95 % verus the extreme...

    Started by liverpool1890‎, 04-17-2007 04:14 PM
    • Replies: 0
    • Views: 1,938
    04-17-2007, 04:14 PM Go to last post
  25. help

    A random sample of selected from a normal population

    Started by liverpool1890‎, 04-17-2007 04:18 PM
    • Replies: 4
    • Views: 2,908
    04-19-2007, 04:23 PM Go to last post
  26. Probability problem and 2 others

    Ok I have 3 problems and I cant figure them out :mad: its driving me crazy. 1. The number of calls coming into a PBX follows a Poisson process...

    Started by durrett syndrome‎, 04-17-2007 04:03 PM
    • Replies: 5
    • Views: 5,508
    04-19-2007, 05:31 PM Go to last post
  27. Silly baseball question.

    I know I'm new, but it's not really my intention to just jump on here and post something and then never post again, honestly I don't know why I...

    Started by elevenspades‎, 04-19-2007 06:31 PM
    • Replies: 2
    • Views: 5,838
    04-22-2007, 08:57 PM Go to last post
  28. Need help plz

    Here is the problem I am stuck on...it's easy, I just can't seem to figure it out for some reason: In a class, the grades are normally...

    Started by gman86‎, 04-23-2007 11:50 PM
    • Replies: 1
    • Views: 2,009
    04-24-2007, 01:06 AM Go to last post
  29. Probability Problem

    I need some help with this probability problem. On any given day, Jen will sell 85% of her baked goods. For a sample of 500 potential customers,...

    Started by Mancolt‎, 04-23-2007 10:46 PM
    • Replies: 1
    • Views: 5,129
    04-24-2007, 01:15 AM Go to last post
  30. Point me in the right direction plz!

    I need help with the second part of this problem: It turns out that the number of Pepsis John has in a week is normally distributed with mean 2.5...

    Started by gman86‎, 04-25-2007 02:05 AM
    • Replies: 0
    • Views: 2,329
    04-25-2007, 02:05 AM Go to last post
  31. Is the following relationship true?

    This came from a paper I was reading. I tried to figure out how the authors reached their results and concluded that the following formula must be...

    Started by wmchung‎, 04-24-2007 04:09 PM
    • Replies: 2
    • Views: 2,349
    04-25-2007, 08:37 AM Go to last post
  32. Help!

    I need help with this problem: a wildlife biologist examines frogs for a genetic trait he suspects may be linked to sensitivity to industry toxins...

    Started by dkman‎, 04-23-2007 02:12 PM
    • Replies: 2
    • Views: 4,748
    04-26-2007, 12:27 AM Go to last post
  33. Learning Probability via a Tutorial Dialogue

    Hi, I have set up a web-site on learning basic probability via tutorial dialogues. After an initial quiz, a talking head ("Dr. Brown") will...

    Started by Dietmar‎, 04-26-2007 06:26 AM
    • Replies: 0
    • Views: 2,684
    04-26-2007, 06:26 AM Go to last post
  34. confidence level

    if i have a sample group of 148, and a response rate of 17%, what is my confidence level with the data?!

    Started by ka_day‎, 04-29-2007 03:05 PM
    • Replies: 0
    • Views: 3,057
    04-29-2007, 03:05 PM Go to last post
  35. Normal Distribution

    Please help me if possible The accounting department at Weston Materials, Inc., a national manufacturer of unattached garages, reports that it...

    Started by xxaim18‎, 04-29-2007 01:55 PM
    • Replies: 2
    • Views: 3,430
    04-29-2007, 06:14 PM Go to last post
  36. Introduction to Statistics question

    Hello All, I have a question on my study guide that says A random sample of 64 observations produced the following summary statistics: sample...

    Started by bbowler‎, 04-29-2007 03:26 PM
    • Replies: 1
    • Views: 3,853
    04-30-2007, 08:17 AM Go to last post
  37. URGENT help needed

    A company are searching for 5 oil wells in a landscape the sucess rate of finding a hole is 10% (0.1) for each hole therefore failure must be 90%...

    Started by amavadia‎, 05-02-2007 08:26 AM
    • Replies: 1
    • Views: 2,036
    05-02-2007, 09:50 AM Go to last post
  38. an interesting Bayesian stat question

    Suppose a random sample of size n is from uniform distribution U(0, exp(gamma)), suppose the prior distribution of gamma is N(a, b), how to find the...

    Started by sweetie‎, 05-02-2007 12:07 AM
    • Replies: 1
    • Views: 1,952
    05-02-2007, 11:21 AM Go to last post
  39. Intro to Probability

    This IS a homework question, but if anyone feels they might lend me some advice, I would greatly appreciate it. University received 2851...

    Started by Rossi‎, 05-03-2007 11:42 AM
    • Replies: 0
    • Views: 3,437
    05-03-2007, 11:42 AM Go to last post
  40. How to get this Z value?

    P<=.667 Z.667 = .432 My question is how to get .432 by using the cumulative normal probability table(z-values). Thanks for your help,...

    Started by corydi‎, 05-03-2007 11:16 PM
    • Replies: 1
    • Views: 2,276
    05-05-2007, 03:16 PM Go to last post
  41. Smile Newbie stuck with problem...

    I am horrible at math and can't seem to grasp this at all... A local bank reports that 70% of it's customers maintain a chequing account, 50% have a...

    Started by momof2‎, 05-04-2007 04:37 PM
    • Replies: 1
    • Views: 3,016
    05-06-2007, 10:58 AM Go to last post
  42. deriving expected value of negative binomial distribution

    Hey all, I've derived the expected value of the binomial distribution, but I can't seem to figure it out for the negative binomial distribution....

    Started by vince‎, 05-13-2007 07:50 PM
    • Replies: 0
    • Views: 11,738
    05-13-2007, 07:50 PM Go to last post
  43. Its been a while since I opened a stats book

    I run a business that uses phone numbers (without country code) to identify customers. We currently run in a country that uses 8 digit phone numbers...

    Started by stokara‎, 04-26-2007 09:25 AM
    • Replies: 1
    • Views: 2,552
    05-14-2007, 04:16 AM Go to last post
  44. Poker and the law...

    Recently, a bill was signed in Indiana that classified poker (and all other card games ) a game of 'chance' and therefore illegal to play for money. ...

    Started by NateWave‎, 05-16-2007 12:10 PM
    • Replies: 0
    • Views: 2,102
    05-16-2007, 12:10 PM Go to last post
  45. "Fair Game" problem

    Hello, I'm new here. I joined in the hope that someone would be able to help me with this problem: --- Players A and B play a fair game for $20:...

    Started by testyou‎, 05-15-2007 03:17 PM
    • Replies: 1
    • Views: 3,533
    05-18-2007, 12:54 PM Go to last post
  46. a random number generator problem

    Hello all, I have to resolve the next type of problem: I have a machine that is supposed to generate truely random 0/1 values. If i'm testing...

    Started by misu200‎, 05-17-2007 05:42 PM
    • Replies: 1
    • Views: 3,387
    05-19-2007, 12:07 AM Go to last post
  47. Urgent Help needed. Thanks in advance.

    Join Date: May 2007 Posts: 1 kellan is on a distinguished road Help needed on problem, URGENT! Thanks in advance. I'm stuck on figuring otu...

    Started by kellan‎, 05-15-2007 12:45 AM
    • Replies: 1
    • Views: 3,441
    05-19-2007, 12:51 AM Go to last post
  48. Desperate

    It would be greatly appreciated if I could get some help with the following question. The probability of incurring an insurance claim loss of...

    Started by Gizmo‎, 09-21-2005 01:09 AM
    • Replies: 2
    • Views: 3,351
    05-20-2007, 08:09 PM Go to last post
  49. Previously Posted Question

    I am trying to view the attachments that are connected to this previous thread. Can anyone help. http://www.talkstats.com/showthread.php?t=1301 ...

    Started by daisy_lynn‎, 05-11-2007 02:12 PM
    • Replies: 1
    • Views: 2,536
    05-21-2007, 02:38 AM Go to last post
  50. everything in life has a probablity of 50-50

    take a minute to think about this: everything in life has a probability of 50-50. it either happenes or it doesn't. I have never inderstood why...

    Started by love2laugh1410‎, 05-20-2007 08:07 PM
    • Replies: 3
    • Views: 4,652
    05-23-2007, 03:38 PM Go to last post
  51. Mom and Daughter Birthdates

    Hi to you all from the UK (Anglesey, Nth Wales) My friend Cathi and her daughter Manon were born on the same date and also the same time (Feb...

    Started by Martin‎, 09-22-2005 01:38 PM
    • Replies: 5
    • Views: 3,150
    05-23-2007, 03:46 PM Go to last post
  52. A conditional prob. question

    Hi, I need some help regarding the following question. Given three random vectors- A, B,C where A and B are presumably statistically independent....

    Started by Dror‎, 05-25-2007 03:05 PM
    • Replies: 3
    • Views: 3,202
    05-27-2007, 01:25 AM Go to last post
  53. Angry Probability Problem - urgent

    A quality-control manager claims that a new process for manufacturing cameras is better because the rate of defects is lower than 5&#37;, which had been...

    Started by footsie81‎, 05-26-2007 01:32 PM
    • Replies: 9
    • Views: 3,709
    05-29-2007, 05:47 AM Go to last post
  54. Odds of an event happening

    Hi all I am trying to determine the odds of an event happening. Lets say I am throwing a coin a series of times (n= 100, 1000, whatever). my...

    Started by maxoo7‎, 05-24-2007 04:56 PM
    • Replies: 2
    • Views: 2,834
    05-29-2007, 03:44 PM Go to last post
  55. Question about percentiles, please help!

    I understand what percentiles are, but I have a horrible teacher and can't figure out the following problem because I don't have an equation. I need...

    Started by rclove‎, 12-05-2006 12:57 AM
    • Replies: 2
    • Views: 2,535
    05-30-2007, 08:34 AM Go to last post
  56. Hello

    Hello everybody

    Started by StephenOP‎, 05-30-2007 10:53 AM
    • Replies: 0
    • Views: 2,058
    05-30-2007, 10:53 AM Go to last post
  57. Expected Value of stocastically independent random variables

    Hello. This seems like an easy problem, but I'm having trouble getting started. Hopefully someone can give me a hint. X_1,...,X_n are...

    Started by moberle‎, 05-30-2007 01:42 PM
    • Replies: 3
    • Views: 5,104
    05-30-2007, 04:17 PM Go to last post
  58. Relative Frequency

    I'm stuck on this one problem. We have the relative error defined as the square root of the variance divided by the expected value. We need to...

    Started by moberle‎, 05-31-2007 08:10 PM
    • Replies: 1
    • Views: 3,158
    06-01-2007, 04:45 AM Go to last post
  59. Help!!!

    I have two questions from an assignment that are stumping me. Although I'm sure they're simple this is an online summer class and the professor isn't...

    Started by avanbel2‎, 05-31-2007 09:45 PM
    • Replies: 3
    • Views: 3,688
    06-01-2007, 08:14 AM Go to last post
  60. Variance

    could someone give me a hint to how to start this, please batteries in batches of 20 have a 3% rate of defects. find the variance for the number...

    Started by rzum‎, 06-01-2007 07:36 AM
    • Replies: 3
    • Views: 2,765
    06-03-2007, 05:50 PM Go to last post

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