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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. PLEASE~ tell me if i'm doing these correctly

    This is the first question for my assignment...I've used a tree diagram to solve this one. Please~~ if anyone can tell me if i'm doing this...

    Started by pluto‎, 08-08-2007 08:50 PM
    • Replies: 0
    • Views: 2,419
    08-08-2007, 08:50 PM Go to last post
  2. 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: 2,113
    08-07-2007, 02:46 PM Go to last post
  3. Need Help with Practice Exam Question ASAP

    Hi. I have an exam coming up and I have no clue on how to do this problem on the practice exam. Can someone help me as soon as you can? Thanks. ...

    Started by angelica‎, 08-06-2007 08:03 AM
    • Replies: 0
    • Views: 2,411
    08-06-2007, 08:03 AM Go to last post
  4. Quetion Reffering to your keno probabilities

    Hello, I was googling about Keno probabilities and came across a thread in your forum about probability of hitting 5 numbers out of 80 with a draw...

    Started by calinut‎, 08-03-2007 11:06 PM
    • Replies: 0
    • Views: 3,135
    08-03-2007, 11:06 PM Go to last post
  5. WeilBull formula help

    Hi everyone, I attach this Excel file below, Its from a book I purchase. The question ask in the book, How can I estimate the probability that a...

    Started by Fin Fang Foom‎, 07-28-2007 12:01 PM
    • Replies: 7
    • Views: 3,545
    07-31-2007, 05:25 PM Go to last post
  6. Newbie help please

    I have done some basic inferential statistics before but not really done much probability before. I was wondering if someone could help me out with...

    Started by rede96‎, 07-31-2007 04:11 AM
    • Replies: 0
    • Views: 2,046
    07-31-2007, 04:11 AM Go to last post
  7. Desperately needing homework help!

    I tried the math lab at the local college and the statistics professor was as stumped as I was! A videotape has an average of one defect every...

    Started by samiam619‎, 07-24-2007 02:41 PM
    • Replies: 4
    • Views: 4,773
    07-30-2007, 04:02 PM Go to last post
  8. 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: 3,335
    07-29-2007, 07:20 PM Go to last post
  9. Help on prior distribution...

    Cosider a random sample of n (consider n>100) elements, and each of them belongs to one of possible classes c1, c2,...ck (consider k<60 clases) from...

    Started by fernrodolfo‎, 07-29-2007 02:05 PM
    • Replies: 0
    • Views: 2,320
    07-29-2007, 02:05 PM Go to last post
  10. How to approximate a non-standard pdf?

    Hi All, I've got a bit of a techincal question here that I would greatly appreciate some guidance on. Although I have some experience with...

    Started by mike-g2‎, 07-23-2007 05:58 PM
    • Replies: 4
    • Views: 3,483
    07-25-2007, 11:49 AM Go to last post
  11. 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: 3,830
    07-24-2007, 09:30 AM Go to last post
  12. 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: 5,769
    07-20-2007, 11:44 PM Go to last post
  13. 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: 2,849
    07-20-2007, 11:33 PM Go to last post
  14. 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: 4,336
    07-20-2007, 07:11 AM Go to last post
  15. Breakeven exit strategy

    Hi, I have a gambling problem (admitting it is half the battle, right?), that I hope someone can help me with. Suppose that I know from historical...

    Started by redart‎, 07-18-2007 01:22 AM
    • Replies: 0
    • Views: 2,521
    07-18-2007, 01:22 AM Go to last post
  16. 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: 2,509
    07-13-2007, 09:38 PM Go to last post
  17. 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: 4,770
    07-13-2007, 03:55 AM Go to last post
  18. 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: 5,377
    07-11-2007, 12:33 AM Go to last post
  19. 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: 2,517
    07-04-2007, 01:44 AM Go to last post
  20. 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: 4,368
    07-03-2007, 01:37 PM Go to last post
  21. 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: 24,910
    07-03-2007, 01:24 PM Go to last post
  22. 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: 5,805
    07-03-2007, 01:08 PM Go to last post
  23. 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: 2,079
    07-03-2007, 12:58 PM Go to last post
  24. 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: 7,415
    07-03-2007, 12:20 PM Go to last post
  25. 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: 3,051
    06-29-2007, 08:43 AM Go to last post
  26. Lightbulb Please help with a simple problem

    Hi, I've been working on an extra credit problem, which seems pretty easy but I can't figure it out. It's only 2 points, but any help would be...

    Started by rocco‎, 06-19-2007 01:30 PM
    • Replies: 4
    • Views: 2,817
    06-28-2007, 01:42 AM Go to last post
  27. 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: 2,226
    06-25-2007, 12:46 AM Go to last post
  28. Exclamation Probability

    Let X1,…,X25 be binomial random variables with identical parameters n=100 and p=0.3. Use the central limit theorem to calculate the probability that...

    Started by Beena‎, 06-21-2007 11:35 PM
    • Replies: 2
    • Views: 2,035
    06-21-2007, 11:47 PM Go to last post
  29. How is it possible to account for lucky guesses?

    I need to solve a problem involving assessing the ability of prospective film analysts to make accurate predictions of the total U.S. box office...

    Started by bitt3n‎, 06-21-2007 05:21 PM
    • Replies: 0
    • Views: 3,189
    06-21-2007, 05:21 PM Go to last post
  30. Mean question

    An oil exploration firm is formed with enough capital to finance 30 explorations. The probability of a particular exploration being successful is...

    Started by penguin22‎, 06-20-2007 04:55 PM
    • Replies: 2
    • Views: 6,040
    06-21-2007, 07:27 AM Go to last post
  31. 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: 1,952
    06-21-2007, 01:41 AM Go to last post
  32. Need help random variables

    Question 1) A hung jury is one that is unable to reach a unanimous decision. Suppose that a pool of 25 potential jurors are assigned to a murder case...

    Started by penguin22‎, 06-19-2007 10:45 AM
    • Replies: 2
    • Views: 4,041
    06-19-2007, 06:10 PM Go to last post
  33. 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: 2,295
    06-19-2007, 02:09 AM Go to last post
  34. Conditional Probability

    I was given this example to study, no solution to check my work. Can you help? I approached (a) using 1-P?? 1-30/100 and (b) 30/100+10/100-5/100...

    Started by lshake‎, 06-17-2007 02:10 AM
    • Replies: 2
    • Views: 2,580
    06-18-2007, 12:59 AM Go to last post
  35. Question Probability of a "success" n or more times out of 10

    Hello everyone! This is my first post on these forums. :) I've got a bit of a curiosity that I've been trying to figure out for a few days. I'm not a...

    Started by JeroMiya‎, 06-16-2007 09:30 AM
    • Replies: 2
    • Views: 4,799
    06-17-2007, 08:26 AM Go to last post
  36. Intersection of compliment--help needed

    Hi There: First time visitor. I have 2 mutually exclusive events A,B. Probability P(A)=0.7,P(B)=0.2 How can I calculate P(A and B')? I think the...

    Started by syedripon‎, 06-17-2007 12:21 AM
    • Replies: 3
    • Views: 3,144
    06-17-2007, 04:14 AM Go to last post
  37. Can't understand some probability symbols.

    For two events, A and B, P(A) =1/2, P(B) =1/3, and P(A �� B) =1/4. Find P(B | A). The symbol where is shows a box here is an upsidedown U. Does...

    Started by jsundsmo‎, 06-16-2007 02:58 PM
    • Replies: 2
    • Views: 21,864
    06-17-2007, 01:00 AM Go to last post
  38. 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: 2,370
    06-17-2007, 12:55 AM Go to last post
  39. Question Simple (?) probability question (colors problem)

    Hi all, I would really appreciate if you can help me out with (what it seems) this simple probability problem. What is throwing me off is the part...

    Started by langosta‎, 06-14-2007 01:04 AM
    • Replies: 3
    • Views: 2,790
    06-14-2007, 10:21 AM Go to last post
  40. Optimum count

    Hi, I am new to this forum and hope that I am posting this question in the right section. Here is the problem that I need help on. I am using an...

    Started by nest‎, 06-12-2007 10:31 AM
    • Replies: 2
    • Views: 2,558
    06-14-2007, 08:00 AM Go to last post
  41. Finding the probability, given only the mean

    Hello, I am in desperate need for assistance. A tutee of mine had a problem with probability. Here is the question: According to J. D. Powers...

    Started by QKTD7‎, 06-11-2007 02:54 PM
    • Replies: 4
    • Views: 6,060
    06-13-2007, 02:22 PM Go to last post
  42. probability of consumption

    could someone let me know what i'm doing wrong? A study of the amount of time it takes a mechanic to rebuild the transmission for a 1992 Chevrolet...

    Started by rzum‎, 06-08-2007 02:13 PM
    • Replies: 4
    • Views: 24,306
    06-13-2007, 11:06 AM Go to last post
  43. 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: 3,866
    06-11-2007, 02:56 PM Go to last post
  44. Shooting Gallery Problem

    I have a shooting gallery probability problem that I can't figure out. Basically, the scenario involves ten hunters that all have a perfect shot....

    Started by vesperka‎, 06-07-2007 09:36 PM
    • Replies: 2
    • Views: 2,115
    06-10-2007, 09:41 PM Go to last post
  45. Smile A simple but trickly probability question

    My coworker asked me a probability problem. It seems simple, but, maybe not actually. Could anyone help me and take a look at the problem? Your...

    Started by redsolar‎, 06-08-2007 02:04 PM
    • Replies: 2
    • Views: 2,155
    06-09-2007, 05:01 AM Go to last post
  46. 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: 4,169
    06-08-2007, 04:06 AM Go to last post
  47. Lightbulb Looking for contributors

    Do you have a background or interest in math or statistics? Do you enjoy helping people, especially beginners, understand a complex concept? ...

    Started by quark‎, 06-07-2007 09:56 PM
    • Replies: 0
    • Views: 3,250
    06-07-2007, 09:56 PM Go to last post
  48. probabilty- setting up variables...(high school)

    i have a quick question. here's the problem From past experience, Stephane Voiture, manager of sales at Downsview Motors, knows that 10% of...

    Started by statschico‎, 06-04-2007 08:50 AM
    • Replies: 0
    • Views: 1,942
    06-04-2007, 08:50 AM Go to last post
  49. 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: 3,861
    06-03-2007, 05:54 PM Go to last post
  50. 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: 2,755
    06-03-2007, 05:50 PM Go to last post
  51. 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: 3,676
    06-01-2007, 08:14 AM Go to last post
  52. 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: 3,146
    06-01-2007, 04:45 AM Go to last post
  53. 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: 5,049
    05-30-2007, 04:17 PM Go to last post
  54. Hello

    Hello everybody

    Started by StephenOP‎, 05-30-2007 10:53 AM
    • Replies: 0
    • Views: 2,043
    05-30-2007, 10:53 AM 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: 2,523
    05-30-2007, 08:34 AM Go to last post
  56. 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: 2,827
    05-29-2007, 03:44 PM Go to last post
  57. 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: 3,695
    05-29-2007, 05:47 AM Go to last post
  58. 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: 3,188
    05-27-2007, 01:25 AM Go to last post
  59. 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: 3,142
    05-23-2007, 03:46 PM Go to last post
  60. 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: 4,617
    05-23-2007, 03:38 PM Go to last post

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