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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: 30,399
    09-30-2005, 09:44 AM Go to last post
  1. another Probabilty distribution :)

    Hi, okay here is another probabitly question that I was having trouble with. Q1: A company services home air conditioners. It is knwon that time...

    Started by Michelle‎, 06-01-2006 08:46 PM
    • Replies: 0
    • Views: 4,728
    06-01-2006, 08:46 PM Go to last post
  2. conditional mean of a lognormal variable

    Hi, does anyone know whether there exists a code or program to calculate the conditional mean of a lognormal variable, e.g. E? Thanks, tarama

    Started by tarama‎, 06-06-2006 11:03 AM
    • Replies: 0
    • Views: 3,159
    06-06-2006, 11:03 AM Go to last post
  3. Difference between two Normal Distributions

    I have a problem where I have two Normal distributions both with a standard deviation of 20 and a difference between the means of 17. I want to work...

    Started by tja26‎, 06-13-2006 10:41 AM
    • Replies: 0
    • Views: 8,087
    06-13-2006, 10:41 AM Go to last post
  4. Pair multiple dice

    Help I have developed a mental block, and despite searching I cannot find any information about how the following works. My problem is...

    Started by NoobSaibot‎, 06-12-2006 09:20 PM
    • Replies: 4
    • Views: 4,200
    06-17-2006, 11:04 PM Go to last post
  5. Analyzing test results- Normal Distribution

    Iím trying to compare my grade on my Algebra exam to my fellow students using the normal distribution. Here are the results of the exam: ...

    Started by ciddis‎, 06-20-2006 10:02 AM
    • Replies: 0
    • Views: 5,755
    06-20-2006, 10:02 AM Go to last post
  6. confidence in expected value

    Hi, My question is about confidence levels in expected values for a distribution that is being sampled. Assume we have two different probability...

    Started by ragip‎, 06-21-2006 04:43 AM
    • Replies: 0
    • Views: 2,466
    06-21-2006, 04:43 AM Go to last post
  7. 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: 2,578
    06-21-2006, 10:50 AM Go to last post
  8. Mum's doubt...

    Hi, I need some help for my mum... Here's it: How can you calculate k, knowning that X~N(a,b) and P(X>k)=c with c>0.5? :confused: I know that...

    Started by dilasluis‎, 06-25-2006 02:56 PM
    • Replies: 0
    • Views: 2,164
    06-25-2006, 02:56 PM Go to last post
  9. Box Plots

    I have got some box plots of my data and need to interpret them .I sort of understand what they mean and what it represents but am unsure of how to...

    Started by maddyhamiltonuk‎, 06-05-2006 12:07 PM
    • Replies: 1
    • Views: 3,336
    06-26-2006, 03:21 PM Go to last post
  10. Probability Question

    Problem I'm working on. Mean-242.2; Standard deviation =45.4; Using a normal probability distribution function I have calculated various...

    Started by bella‎, 06-28-2006 05:15 PM
    • Replies: 0
    • Views: 2,094
    06-28-2006, 05:15 PM Go to last post
  11. Cool Distribution of X

    Well, finally finished my assignement! Here's my stumbling block though: How to tell what methods or equations to use when a problem is posed?! I...

    Started by greenatstats‎, 11-07-2005 10:45 PM
    • Replies: 2
    • Views: 3,793
    07-07-2006, 12:57 AM Go to last post
  12. Question Probability

    A programmer designed a new program that required the user to enter a 3 character password in order to be recognized as a legal user. The first...

    Started by edare‎, 07-01-2006 08:16 PM
    • Replies: 1
    • Views: 3,886
    07-10-2006, 10:51 AM Go to last post
  13. Question calculating frequency of ingredients in various cookbooks?

    Hi Everybody I just need a push in the correct direction of which statistics formula I should use and how? I am given x number (unknown) of...

    Started by dontrigg‎, 06-25-2006 11:41 AM
    • Replies: 3
    • Views: 2,439
    07-19-2006, 09:14 AM Go to last post
  14. roulette probability questions

    PLEASE HELP ME ASAP WITH THIS PRBLEM!!! In the game of roulette, the probability of winning when the betting on a color is 0.474. Assume the game...

    Started by natalie‎, 06-11-2006 09:59 PM
    • Replies: 1
    • Views: 5,632
    07-19-2006, 09:17 AM Go to last post
  15. Please help with expected value

    In the casino game called High-Low, there are three possible bets. Assume that $1 is the size of the bet. A pair of fair six-sided dice is rolled and...

    Started by lincolntran‎, 06-07-2006 03:20 PM
    • Replies: 1
    • Views: 5,096
    07-19-2006, 09:20 AM Go to last post
  16. Question Hi there

    Hi everyone If I have 100 recipe sheets. And, 10 of these sheets are linked because they all contain the same ingredient. I have been told that...

    Started by dontrigg‎, 06-27-2006 03:14 AM
    • Replies: 3
    • Views: 2,524
    07-19-2006, 02:34 PM Go to last post
  17. Exam Review Question: Poisson Probability

    I have gone over my exam review and I understand most of the questions on the review, but here is a question I am not sure how to solve. I know the...

    Started by iLLogic‎, 07-23-2006 06:56 PM
    • Replies: 0
    • Views: 4,338
    07-23-2006, 06:56 PM Go to last post
  18. Poisson distribution...anyone good with those?

    The question is: 4.One department store has two entrances. The number of car entered each entrance are Poisson distribution. The first entrance...

    Started by koss123‎, 07-28-2006 10:44 PM
    • Replies: 0
    • Views: 2,298
    07-28-2006, 10:44 PM Go to last post
  19. Calculating "p-value"

    Hello, I'm brand new to this site...and trying to figure out (I know this is probably very elementary to all of you) "What is the value that appears...

    Started by rick‎, 07-29-2006 10:51 AM
    • Replies: 0
    • Views: 2,745
    07-29-2006, 10:51 AM Go to last post
  20. Question counting rule questions

    Consider 5 card poker hands dealt from a 52 card deck. two important events are: A(you draw a flush), B(you draw a straight). Q: find P(A)? find...

    Started by new‎, 07-29-2006 04:55 PM
    • Replies: 0
    • Views: 2,609
    07-29-2006, 04:55 PM Go to last post
  21. High Sig. Values in ANOVA and post-hoc?

    I have another question, which I'm looking for a statistical opinion on. On the ANOVA & Post-hoc analysis in SPSS: When we look for statistical...

    Started by Billyvic‎, 07-30-2006 12:34 PM
    • Replies: 0
    • Views: 2,515
    07-30-2006, 12:34 PM Go to last post
  22. Question Is it a normal distribution?

    The median income of residents in a certain community is $20,000. If 1,000 peopole are randomly sampled from the population of residents, let x equal...

    Started by new‎, 08-01-2006 03:29 PM
    • Replies: 0
    • Views: 2,002
    08-01-2006, 03:29 PM Go to last post
  23. Binomial distribution

    Can someone explain to me why for a binomial distribution you can't analyze an event that is changing over time?

    Started by lostinspace‎, 07-31-2006 09:10 PM
    • Replies: 1
    • Views: 2,332
    08-02-2006, 09:50 AM Go to last post
  24. exponential distribution?

    Hi, I'm a research assistant with limited background in stats. We have a variable that is well-approximated by an exponential distribution. ...

    Started by drgold‎, 08-02-2006 12:25 PM
    • Replies: 3
    • Views: 2,593
    08-04-2006, 03:44 AM Go to last post
  25. sounds like a simple probability question

    Hope someone can help me. A store has 6 TV graphic magazines and 8 Newstime magazines on the counter. If two customers purchased a magazine, find...

    Started by koss123‎, 07-18-2006 01:00 PM
    • Replies: 5
    • Views: 3,113
    08-14-2006, 09:05 AM Go to last post
  26. Conditional Probability

    I've been working on this one for the last 3 days to no avail. The problem is this: "A statistics professor wants to ensure that she is not late...

    Started by mrkvvlt‎, 08-14-2006 06:20 PM
    • Replies: 1
    • Views: 5,813
    08-15-2006, 09:59 PM Go to last post
  27. identifying the distribution of a data set

    Dear all I am creating a software that is reading tcp packets from a link. I have the following information available: size of the packet: ...

    Started by alinaqvi90‎, 08-10-2006 09:47 PM
    • Replies: 4
    • Views: 5,280
    08-16-2006, 10:58 PM Go to last post
  28. circular permutation

    Hello: I have a probability problem I would like some takes on, please. "There are 5 boys and 3 girls sitting around a circular table. What is...

    Started by galactus‎, 08-10-2006 10:29 AM
    • Replies: 5
    • Views: 4,418
    08-17-2006, 09:41 AM Go to last post
  29. Need help with this assignment.

    Please help me with this assignment: A. cash back when the consumer make an online purchase; B. cash back when the consumer make a purchase at...

    Started by winston waldron‎, 08-25-2006 11:32 PM
    • Replies: 0
    • Views: 2,530
    08-25-2006, 11:32 PM Go to last post
  30. look at it and please give your reply

    Bank would like to examine the required sample size needed to be able to estimate the mean dollars that each card holder will spend each month. It...

    Started by winston waldron‎, 08-26-2006 12:15 AM
    • Replies: 2
    • Views: 3,611
    08-27-2006, 12:09 AM Go to last post
  31. Simple prob?

    Demand for a car is normally distributed with a certain mean and stdev. There is a lead time of exactly "x" number of weeks for a car order. ...

    Started by lp100‎, 08-28-2006 11:08 PM
    • Replies: 0
    • Views: 2,090
    08-28-2006, 11:08 PM Go to last post
  32. Analyzing averages with different number of trials

    Hi everyone, I am having trouble with figuring out the workings of the following problem: If you have two drivers A and B. Driver A wins 100...

    Started by JB007‎, 08-17-2006 06:56 AM
    • Replies: 1
    • Views: 2,297
    08-29-2006, 01:24 PM Go to last post
  33. Newbie Really Needing Help

    I am having a problem with one of my assignments for my class, and for the life of me, I cannot solve it. Any help would be much appreciated! Here...

    Started by Leper Messiah‎, 08-29-2006 08:59 PM
    • Replies: 4
    • Views: 2,469
    08-29-2006, 09:35 PM Go to last post
  34. Can you figure this out?

    My company has a Safety Bingo game. For every day there is no accident in the plant, we pull a number. Every associate has a card and there are 110...

    Started by buck‎, 08-23-2006 02:36 PM
    • Replies: 2
    • Views: 3,359
    08-30-2006, 09:25 AM Go to last post
  35. no idea of what formula to use

    I'm not sure what exactly the question is asking or what formula I should use.....If someone has an opinion on a formula, that would be greatly...

    Started by tabitha013‎, 08-30-2006 05:22 PM
    • Replies: 3
    • Views: 3,841
    08-31-2006, 09:32 AM Go to last post
  36. pls help me with im desperate

    a local bank reports that 70% of its customer maintain a chequing account, 50% have a savings account an d 40% have both. of a customer is chosen...

    Started by sweetx‎, 08-29-2006 10:36 PM
    • Replies: 2
    • Views: 4,718
    08-31-2006, 11:42 PM Go to last post
  37. pobability, pls help

    A survey by the Canadian frequent flyers association revealed that 60% of its members made independent airline reservations last year. If two...

    Started by sweetx‎, 08-29-2006 10:32 PM
    • Replies: 2
    • Views: 2,608
    08-31-2006, 11:45 PM Go to last post
  38. im just stuck. pls help me

    You wish to open a new restaurant and are considering locations in Edmonton and St. Albert, but only one location will actually become ...

    Started by sweetx‎, 08-29-2006 10:34 PM
    • Replies: 6
    • Views: 5,381
    09-01-2006, 12:46 AM Go to last post
  39. Am I right?

    The odds are two to one that when A and B play tennis A wins. Suppose that A and B play two matches. What is the probability that A wins at least...

    Started by structstat‎, 09-01-2006 05:51 PM
    • Replies: 2
    • Views: 4,740
    09-01-2006, 06:37 PM Go to last post
  40. Please clarify this problem

    I dont even know what to make of the problem. May be one of you can help me out by explaining what is S. An experiment involves tossing a pair of...

    Started by structstat‎, 09-01-2006 06:36 PM
    • Replies: 1
    • Views: 2,384
    09-01-2006, 06:59 PM Go to last post
  41. 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: 3,106
    09-02-2006, 06:00 PM Go to last post
  42. 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: 3,568
    09-03-2006, 08:52 AM Go to last post
  43. probabiliy distribution

    A factory has recorded the number of workplace injuries per week and deriveed the following probability disstribution. Number of injuries (x)= 0...

    Started by sweetlady‎, 09-01-2006 08:47 PM
    • Replies: 2
    • Views: 2,085
    09-03-2006, 03:28 PM Go to last post
  44. probability

    according to the CRA, the chances of your tax return being audited are 3 in 100 if your income is less than $60,000 and 8 in 100 if your income is...

    Started by sweetlady‎, 09-01-2006 08:48 PM
    • Replies: 2
    • Views: 2,675
    09-03-2006, 03:32 PM Go to last post
  45. probability

    It is known that 30% of all customers of a major national credit card pay their statement in full before any interest charges are incurred. for a...

    Started by sweetx‎, 09-01-2006 07:16 PM
    • Replies: 2
    • Views: 2,795
    09-03-2006, 03:46 PM Go to last post
  46. Question student-t to N(0,1)

    PLS. HELP HOW DO YOU SHOW THAT THE lim as p->infinity f(x|p) = (1/sqrt2pi)e^-(x^2/2),:( :( where f(x|p) is a student t distn with p degrees of...

    Started by rd_axia‎, 09-04-2006 05:38 PM
    • Replies: 0
    • Views: 2,225
    09-04-2006, 05:38 PM Go to last post
  47. Easy probability question, but I am clueless

    Hello, I am an MBA Student taking a Business Stat class and I am really struggling with probability. I can enter the information into the...

    Started by Need Stat Help, Stat!‎, 08-28-2006 01:07 PM
    • Replies: 5
    • Views: 2,709
    09-04-2006, 06:28 PM Go to last post
  48. Binomial Model?

    Hello, Would appreciate any help with the following question.. A shoe store's records show that 30% of customers making a purchase use a credit...

    Started by nat9‎, 09-03-2006 02:42 AM
    • Replies: 5
    • Views: 2,616
    09-05-2006, 08:35 AM Go to last post
  49. normal distribution

    Hi I am having trouble with normal distribution as part of my SPC module for a business course. I understand the equations for binomial and...

    Started by scotchpie‎, 09-06-2006 02:11 PM
    • Replies: 1
    • Views: 2,214
    09-06-2006, 02:45 PM Go to last post
  50. standard distribution/probability

    Use the standard normal distributin table to find a) P(Z<1.00) B) P(0<Z<1.43)

    Started by sweetlady‎, 09-01-2006 08:48 PM
    • Replies: 7
    • Views: 2,526
    09-07-2006, 12:23 PM Go to last post
  51. Expectation Value

    Could somebody explain logically how does: E(aY + b) = aE(Y) + b given Y is continuous and a & b are constants.

    Started by structstat‎, 09-09-2006 07:36 PM
    • Replies: 5
    • Views: 3,542
    09-10-2006, 01:13 AM Go to last post
  52. Geometric probability

    How many times would you expect to tosss a balanced coin to obtain the first head? Ok, I have p(y) = q exp (y-1) * p Is q = 1-p? and I'm...

    Started by structstat‎, 09-08-2006 03:28 PM
    • Replies: 7
    • Views: 3,088
    09-10-2006, 05:17 PM Go to last post
  53. Question Bayes Theorem - JohnM vs my textbook

    To JohnM or anyone who knows... I am struggling with positive and negative predictive values (PPV and NPV) homework problems. My textbook...

    Started by ALvr‎, 09-10-2006 05:19 PM
    • Replies: 2
    • Views: 3,003
    09-10-2006, 08:27 PM Go to last post
  54. Need Help Please

    There is a group of 200 college students, 138 are taking psychology, 115 are taking sociology, and 91 are taking both. a.) How many of the...

    Started by Leper Messiah‎, 09-10-2006 09:24 PM
    • Replies: 4
    • Views: 5,358
    09-10-2006, 10:48 PM Go to last post
  55. Probability Game

    A marble is hidden in one of the three boxes. You have to go through two steps: 1. Select one of the boxes. As soon as you selected one of the...

    Started by lilaznjedi‎, 09-11-2006 03:20 PM
    • Replies: 2
    • Views: 2,899
    09-11-2006, 11:45 PM Go to last post
  56. Probability question

    If probability A and B are 0.5 each, how do you find that a probability of A is more than three times the P(B)? Do you simply do: P(A)^3?

    Started by structstat‎, 09-12-2006 01:42 PM
    • Replies: 3
    • Views: 4,013
    09-12-2006, 07:05 PM Go to last post
  57. Help! Expected value, standard deviations and probabilities...

    Hi I have no clue how to even start this....it's been a long time since I've done stats...and this is for a finance class: Suppose a firm's stock...

    Started by Qristel‎, 09-13-2006 06:39 PM
    • Replies: 0
    • Views: 2,528
    09-13-2006, 06:39 PM Go to last post
  58. I'm curious...

    I was just looking over an old exam, and I came across a problem with T scores. I know how to work with z scores, but I'm confused with T scores. I...

    Started by Christy‎, 09-13-2006 08:23 PM
    • Replies: 1
    • Views: 2,303
    09-13-2006, 08:35 PM Go to last post
  59. Probability Question

    Hi. Can someone point me in the right direction on how to solve this problem: A pair of dice is thrown. Let X be the higher of the two numbers...

    Started by lilaznjedi‎, 09-12-2006 10:09 PM
    • Replies: 7
    • Views: 2,886
    09-14-2006, 12:43 PM Go to last post
  60. Test Score Probability

    Iím trying to compare my grade on my Algebra exam to my fellow students using the normal distribution. Here are the results of the exam: ...

    Started by ciddis‎, 09-14-2006 09:12 AM
    • Replies: 1
    • Views: 6,164
    09-14-2006, 01:00 PM Go to last post

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