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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: 30,170
    09-30-2005, 09:44 AM Go to last post
  1. 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: 2,192
    09-06-2006, 02:45 PM Go to last post
  2. 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: 2,603
    09-05-2006, 08:35 AM Go to last post
  3. 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: 2,687
    09-04-2006, 06:28 PM Go to last post
  4. 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: 2,184
    09-04-2006, 05:38 PM Go to last post
  5. 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: 2,752
    09-03-2006, 03:46 PM Go to last post
  6. 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: 2,617
    09-03-2006, 03:32 PM Go to last post
  7. 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: 2,058
    09-03-2006, 03:28 PM Go to last post
  8. 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: 3,514
    09-03-2006, 08:52 AM Go to last post
  9. 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: 3,031
    09-02-2006, 06:00 PM Go to last post
  10. 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: 2,349
    09-01-2006, 06:59 PM Go to last post
  11. 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: 4,702
    09-01-2006, 06:37 PM Go to last post
  12. 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: 5,315
    09-01-2006, 12:46 AM Go to last post
  13. 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: 2,550
    08-31-2006, 11:45 PM Go to last post
  14. 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: 4,663
    08-31-2006, 11:42 PM Go to last post
  15. 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: 3,770
    08-31-2006, 09:32 AM Go to last post
  16. 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: 3,293
    08-30-2006, 09:25 AM Go to last post
  17. 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: 2,431
    08-29-2006, 09:35 PM Go to last post
  18. 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: 2,260
    08-29-2006, 01:24 PM Go to last post
  19. 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: 2,038
    08-28-2006, 11:08 PM Go to last post
  20. 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: 3,557
    08-27-2006, 12:09 AM Go to last post
  21. 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: 2,492
    08-25-2006, 11:32 PM Go to last post
  22. 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: 4,373
    08-17-2006, 09:41 AM Go to last post
  23. 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: 5,156
    08-16-2006, 10:58 PM Go to last post
  24. 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: 5,709
    08-15-2006, 09:59 PM 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: 3,075
    08-14-2006, 09:05 AM Go to last post
  26. 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: 2,562
    08-04-2006, 03:44 AM Go to last post
  27. 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: 2,307
    08-02-2006, 09:50 AM Go to last post
  28. 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: 1,986
    08-01-2006, 03:29 PM Go to last post
  29. 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: 2,480
    07-30-2006, 12:34 PM Go to last post
  30. 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: 2,583
    07-29-2006, 04:55 PM Go to last post
  31. 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: 2,718
    07-29-2006, 10:51 AM Go to last post
  32. 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: 2,260
    07-28-2006, 10:44 PM Go to last post
  33. 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: 4,277
    07-23-2006, 06:56 PM Go to last post
  34. 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: 2,488
    07-19-2006, 02:34 PM Go to last post
  35. 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: 5,048
    07-19-2006, 09:20 AM Go to last post
  36. 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: 5,581
    07-19-2006, 09:17 AM Go to last post
  37. 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: 2,373
    07-19-2006, 09:14 AM Go to last post
  38. 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: 3,822
    07-10-2006, 10:51 AM Go to last post
  39. 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: 3,762
    07-07-2006, 12:57 AM Go to last post
  40. 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: 2,063
    06-28-2006, 05:15 PM Go to last post
  41. 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: 3,301
    06-26-2006, 03:21 PM Go to last post
  42. 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: 2,115
    06-25-2006, 02:56 PM Go to last post
  43. 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: 2,544
    06-21-2006, 10:50 AM Go to last post
  44. 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: 2,442
    06-21-2006, 04:43 AM Go to last post
  45. Analyzing test results- Normal Distribution

    Im 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: 5,673
    06-20-2006, 10:02 AM Go to last post
  46. 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: 4,151
    06-17-2006, 11:04 PM Go to last post
  47. 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: 8,021
    06-13-2006, 10:41 AM Go to last post
  48. 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: 3,123
    06-06-2006, 11:03 AM Go to last post
  49. 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: 4,701
    06-01-2006, 08:46 PM Go to last post
  50. random variables/probability distributions


    Started by Michelle‎, 06-01-2006 08:34 PM
    • Replies: 0
    • Views: 2,145
    06-01-2006, 08:34 PM Go to last post
  51. Normal distribution and intervals

    I keep turning these around and am hoping I am on the right track Distribution of raw scores has mean=581 and sd=70. Find the interval of...

    Started by Sully‎, 05-24-2006 10:56 PM
    • Replies: 1
    • Views: 2,254
    05-30-2006, 10:10 AM Go to last post
  52. probability distribution

    A keyring contains 4 keys that appear to be identical, although only one will open a particular door. Describe the probability distribution of X: ...

    Started by skhan‎, 05-25-2006 12:16 AM
    • Replies: 1
    • Views: 2,764
    05-29-2006, 03:09 PM Go to last post
  53. another probability

    this question has three parts and once again I was able to answer part A and B by drawing the tree diagram but I cant seem to figure out part C ...

    Started by aptiva‎, 05-23-2006 12:26 PM
    • Replies: 2
    • Views: 2,638
    05-25-2006, 09:05 PM Go to last post
  54. P Value

    38 of 120 high school students work over 20 hours per week. Does this demonstrate that more than 25% of high school students work over 20 hours...

    Started by Sully‎, 05-24-2006 11:39 PM
    • Replies: 0
    • Views: 3,114
    05-24-2006, 11:39 PM Go to last post
  55. probability geneticist

    I was able to answer the first 3 parts of this question but i cant figure out the last one A geneticist has bred three different strains of...

    Started by aptiva‎, 05-23-2006 12:14 PM
    • Replies: 1
    • Views: 2,708
    05-24-2006, 08:02 PM Go to last post
  56. Uniform Dist.

    Hey, havin a bit of trouble on this question, not quite sure what to do If X is uniformly dist. over a range of values 8 to 21 pr(X>=7)? Do...

    Started by catch22‎, 05-22-2006 06:51 PM
    • Replies: 2
    • Views: 2,584
    05-23-2006, 04:12 AM Go to last post
  57. Bernoulli Principle

    I'm sorry this question is vague, but can anyone explain the basic equation and steps used for the Bernoulli Principle? I understand the equation: ...

    Started by kateisgo‎, 05-21-2006 08:21 PM
    • Replies: 1
    • Views: 2,572
    05-21-2006, 09:26 PM Go to last post
  58. tricky probability

    bob wants to borrow the family car tonight to go on a date with his girlfriend. Bob knows that there is a 30% chance that the car will be avaliable,...

    Started by skhan‎, 05-21-2006 02:20 PM
    • Replies: 2
    • Views: 3,176
    05-21-2006, 04:12 PM Go to last post
  59. 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: 4,036
    05-19-2006, 12:21 PM Go to last post
  60. figuring out a cutoff value

    :confused: Hello :confused: Since my teacher hasn't replied to any of my e-mails, I could use some help related to continuous probability...

    Started by half-life‎, 05-16-2006 10:28 PM
    • Replies: 1
    • Views: 7,862
    05-19-2006, 12:20 PM Go to last post

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