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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: 30,337
    09-30-2005, 09:44 AM Go to last post
  1. Uncorrelation

    Hello. I'm stuck on how to start this problem. Any tips are appreciated. Let X be continuously distributed with a symmetic probability density...

    Started by moberle‎, 06-10-2007 05:01 PM
    • Replies: 1
    • Views: 3,917
    06-11-2007, 02:56 PM Go to last post
  2. 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: 2,480
    01-29-2007, 04:53 AM Go to last post
  3. 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: 3,257
    01-28-2007, 04:03 PM Go to last post
  4. please help...

    Hello, I'm having a lot of trouble with this problem, and it doesn't seem like it should be difficult. A bowl contains 20 cherries, exactly 15...

    Started by statsnovice‎, 01-16-2007 01:04 AM
    • Replies: 1
    • Views: 3,159
    01-17-2007, 12:31 AM Go to last post
  5. Normal Curve

    Calculate the standard score of the given X value, X=61.6 where mu=66.7 and standard deviation is 65.2 I got a negative score of .078, that can't...

    Started by cannoli‎, 01-18-2007 12:15 PM
    • Replies: 1
    • Views: 4,249
    01-19-2007, 10:08 PM Go to last post
  6. 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: 2,260
    01-28-2007, 04:27 PM Go to last post
  7. 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: 3,684
    01-31-2007, 06:17 PM Go to last post
  8. 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: 5,926
    01-31-2007, 06:17 AM Go to last post
  9. 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: 2,954
    02-06-2007, 07:15 PM Go to last post
  10. 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: 2,863
    02-05-2007, 12:17 PM Go to last post
  11. 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: 2,897
    02-06-2007, 07:45 AM Go to last post
  12. 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: 2,185
    04-17-2007, 07:42 AM Go to last post
  13. Quantifying the Prediction Error

    Hello, I have a Regression model which predicts the length of certain vectors that exists in Financial Markets. These vectors start in the...

    Started by quant‎, 06-10-2007 02:17 PM
    • Replies: 1
    • Views: 3,105
    06-29-2007, 08:43 AM Go to last post
  14. 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: 5,154
    04-24-2007, 01:15 AM Go to last post
  15. 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: 2,024
    04-24-2007, 01:06 AM Go to last post
  16. Exclamation Normal Distribution Problem

    Hi, I've been working on this problem for a while now and keep getting stuck. The problem says, The length of time before a cell phone using a...

    Started by Cinny_72‎, 04-25-2007 04:24 PM
    • Replies: 1
    • Views: 4,457
    07-03-2007, 01:37 PM Go to last post
  17. 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: 2,575
    05-14-2007, 04:16 AM Go to last post
  18. 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: 3,870
    04-30-2007, 08:17 AM Go to last post
  19. 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: 1,964
    05-02-2007, 11:21 AM Go to last post
  20. 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: 2,043
    05-02-2007, 09:50 AM Go to last post
  21. 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: 2,289
    05-05-2007, 03:16 PM Go to last post
  22. 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: 3,030
    05-06-2007, 10:58 AM Go to last post
  23. 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: 2,557
    05-21-2007, 02:38 AM Go to last post
  24. Am I doing this right?

    :confused: Im not sure if im doing this right. This is the question that I am working on right now. You wish to open a new restaurant and are...

    Started by daisy_lynn‎, 05-11-2007 05:38 PM
    • Replies: 1
    • Views: 2,562
    07-04-2007, 01:44 AM Go to last post
  25. 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: 3,462
    05-19-2007, 12:51 AM Go to last post
  26. "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: 3,555
    05-18-2007, 12:54 PM Go to last post
  27. Help with Conditonal Probability

    I think this is a classic problem. :) Oscar has lost his dog in either forest A (with a priori probability 0.4), or in forest B (with a priori...

    Started by lilaznjedi‎, 06-08-2007 08:05 AM
    • Replies: 1
    • Views: 5,849
    07-03-2007, 01:08 PM Go to last post
  28. 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: 3,403
    05-19-2007, 12:07 AM Go to last post
  29. Expected Value of Exponential Distribution

    I've almost completed this problem, but I'm stuck on the last part. The first two parts that I've already shown are also given: a) For a whole...

    Started by moberle‎, 05-23-2007 04:27 PM
    • Replies: 1
    • Views: 24,988
    07-03-2007, 01:24 PM Go to last post
  30. 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: 3,178
    06-01-2007, 04:45 AM Go to last post
  31. Guidance

    Hi, Can someone please send me in the right direction with this problem? I think it is to do with the random variable??? The president of an...

    Started by Jane80‎, 06-02-2007 07:29 PM
    • Replies: 1
    • Views: 3,925
    06-03-2007, 05:54 PM Go to last post
  32. Unhappy Random Number Generator

    I know this is a message board for homework but I have a question for something that I'm actually doing at work. Its been three years since my...

    Started by fperri‎, 06-05-2007 11:08 AM
    • Replies: 1
    • Views: 4,244
    06-08-2007, 04:06 AM Go to last post
  33. no idea where to start Urgent

    An interior decorator must furnish two offices. Each office must have a desk, a chair, a file cabinet and 2 bookcases. At a local office furniture...

    Started by Jane80‎, 06-16-2007 07:59 PM
    • Replies: 1
    • Views: 2,388
    06-17-2007, 12:55 AM Go to last post
  34. Need help on statistics problem

    Pregnancy durations; Data from the national vital statistics report reveal that the distribution of the duration of human pregnancies is...

    Started by JZomisky‎, 06-18-2007 10:45 PM
    • Replies: 1
    • Views: 2,326
    06-19-2007, 02:09 AM Go to last post
  35. Help Please

    I have a problem, I am just not figuring out and would love some help. Return on Common Stock has a mean of 14.4% and a standard deviation of...

    Started by krazy‎, 06-20-2007 09:13 AM
    • Replies: 1
    • Views: 1,968
    06-21-2007, 01:41 AM Go to last post
  36. Probability: Is this right?

    Chances of being audited are 3 in 100 if income less than 60 000 and 8 in 100 if income more than 60 000 a. if 7 taxpayers with income over 60 000...

    Started by momof2‎, 06-23-2007 05:36 PM
    • Replies: 1
    • Views: 2,265
    06-25-2007, 12:46 AM Go to last post
  37. distribution function of the division of two variables

    Hello Probably this is a silly question, but its is being resulting a non obvious task for me. Any isight would be welcome. I have a continous...

    Started by mlaspalas‎, 06-25-2007 12:59 PM
    • Replies: 1
    • Views: 5,822
    07-20-2007, 11:44 PM Go to last post
  38. Can someone tell me the why?

    I'm trying to figure out this self-check exercise but don't see why it multiplies by 2 to the 5th or 32. Can someone help?

    Started by ChadP‎, 06-26-2007 04:32 AM
    • Replies: 1
    • Views: 2,118
    07-03-2007, 12:58 PM Go to last post
  39. Probability Problem - Please help

    Hi, I've got a probability problem that has had me stumped all weekend. Can anybody please help? Suppose that two balanced dice are tossed...

    Started by Nicholas‎, 07-02-2007 05:07 AM
    • Replies: 1
    • Views: 7,447
    07-03-2007, 12:20 PM Go to last post
  40. Probability distribution

    5.20 An investor plans to put $50,000 in one of four investments. The return on each investment depends on whether next year’s economy is strong or...

    Started by ChadP‎, 07-10-2007 01:27 PM
    • Replies: 1
    • Views: 5,422
    07-11-2007, 12:33 AM Go to last post
  41. need help with a few questions

    the question is: A shrub that is purchased at a local nursery has probability .80 of surviving the first year. If a customer pruchases 4 shrubs,...

    Started by Brittany Freilinger‎, 07-11-2007 12:26 PM
    • Replies: 1
    • Views: 4,865
    07-13-2007, 03:55 AM Go to last post
  42. Question About marginal densities... confused

    If we have N random variables (not necessarily normal; with some level of correlation) and M observations of them (i.e. we have M N-dimensional...

    Started by kazec‎, 07-13-2007 04:02 AM
    • Replies: 1
    • Views: 2,536
    07-13-2007, 09:38 PM Go to last post
  43. Please help, immediately!

    I have no understanding of statistics whatsoever. I need help with the following two problems: 1. Eight events in a certain sample space have an...

    Started by stacester115‎, 07-15-2007 10:48 AM
    • Replies: 1
    • Views: 2,885
    07-20-2007, 11:33 PM Go to last post
  44. Exponentially Distributed Random Variable

    Hey everyone, im having a hard time with this questions, I guess its just not clicking. I was wondering if someone could give me some pointers. ...

    Started by Bloodshot‎, 07-19-2007 05:41 PM
    • Replies: 1
    • Views: 4,376
    07-20-2007, 07:11 AM Go to last post
  45. Homework Question

    I posted this in the "Statistics" thread, then realized it should probably be here, in "Probability". Forgive my repetitiveness! Hi everyone: ...

    Started by jillianleab‎, 07-23-2007 02:21 PM
    • Replies: 1
    • Views: 3,882
    07-24-2007, 09:30 AM Go to last post
  46. Help

    When a customer enters a store there are three outcomes that can occur: buy nothing, buy a small amount or buy a large amount. In this situation, if...

    Started by cathy‎, 07-27-2007 10:09 AM
    • Replies: 1
    • Views: 3,375
    07-29-2007, 07:20 PM Go to last post
  47. Please Help Desparately

    1.Give interpretations of the terms bias and "precision" as used in the practice of forecasting 2.Explain the terms "Goodness of fit" and...

    Started by jozi‎, 07-31-2007 07:03 AM
    • Replies: 1
    • Views: 2,125
    08-07-2007, 02:46 PM Go to last post
  48. consectutive wins in 10,000 events

    Hello, Thanks in advance for your help. My question is related to probability. I think I know the answer, but I would like confirmation on my...

    Started by Bjorn‎, 08-04-2007 10:29 AM
    • Replies: 1
    • Views: 2,402
    08-13-2007, 03:40 PM Go to last post
  49. what are the odds of this! please help!

    Ok, So I play poker, and its been an awfully dry night of cards, at one point it feels so bad I start logging it and see that before I quit, I was...

    Started by Shaud‎, 08-05-2007 10:46 PM
    • Replies: 1
    • Views: 2,569
    08-13-2007, 12:56 PM Go to last post
  50. Need help with z-test for significance

    Below is the table i have that i want to test significance on. Total Status YES NO DONT KNOW 48 N 93.92 1.85 4.23...

    Started by stumbling‎, 08-16-2007 08:29 AM
    • Replies: 1
    • Views: 3,285
    08-16-2007, 09:44 AM Go to last post
  51. help

    I am having a difficult time understanding probability. Here are some questions I am trying to figure out. 1.) Several students are unprepared for...

    Started by JELEWIS01‎, 08-16-2007 05:50 PM
    • Replies: 1
    • Views: 4,556
    08-17-2007, 08:06 AM Go to last post
  52. Confidence Interval HELP Plz

    Plz Help!!!!!!! I can't figure this out Confidence interval for the population mean: Use of the t distribution A corporation that maintains a...

    Started by wengermel‎, 08-20-2007 05:09 PM
    • Replies: 1
    • Views: 5,043
    08-21-2007, 11:13 AM Go to last post
  53. Bayes Rule Problem

    Ok, I'm trying to learn Baye's Rule, but I'm very new to it. I understand the rule to say P(A given B) = P(B given A) x P(A) / Assuming that...

    Started by newtostats‎, 08-31-2007 07:02 PM
    • Replies: 1
    • Views: 2,736
    09-04-2007, 09:33 AM Go to last post
  54. Probability Help!!!

    I need help. The probability that you will pass a test is .74. what is the probability that you will fail the test? Is it .26?

    Started by sharons‎, 09-02-2007 09:55 PM
    • Replies: 1
    • Views: 2,369
    09-03-2007, 03:24 AM Go to last post
  55. Question from a novice

    I have not studied statistics in college, but I have a question that is probably a simple one. I have had this discussion with my friends, but we...

    Started by lesterman‎, 09-06-2007 08:22 AM
    • Replies: 1
    • Views: 2,376
    09-06-2007, 09:31 AM Go to last post
  56. Requested Probability-Help

    P(Z>-2.576) is it .5000 + .4951 =.9951

    Started by sharons‎, 09-10-2007 09:55 PM
    • Replies: 1
    • Views: 2,979
    09-11-2007, 04:02 PM Go to last post
  57. circuit failure

    A message is transmitted using a binary code of 0's and 1's. Each transmitted bit (0 or 1) must pass through three relays before reaching a receiver....

    Started by roldy‎, 09-10-2007 11:26 PM
    • Replies: 1
    • Views: 4,458
    09-11-2007, 12:17 AM Go to last post
  58. keno problem

    In a keno game 20 numbers are picked.We write those numbers down.What is the probability of those original 20 numbers that we wrote down coming up...

    Started by myvette‎, 09-11-2007 11:45 AM
    • Replies: 1
    • Views: 2,969
    09-11-2007, 11:59 AM Go to last post
  59. Question i need help!

    this is my first year taking a stats class and i dont understand this question if someone could explain how to do it to me that would be greatly...

    Started by britishbrat13‎, 09-12-2007 05:12 PM
    • Replies: 1
    • Views: 2,394
    09-13-2007, 01:48 AM Go to last post
  60. How did I get this answer?

    What is the probability of getting 10 heads in 20 flips of a fair coin? n = 20 x = 10 p = 0.5 I plug in the numbers into my ti-84 and get...

    Started by RyanJ‎, 09-13-2007 02:22 PM
    • Replies: 1
    • Views: 3,627
    09-13-2007, 02:49 PM Go to last post

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