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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: 30,326
    09-30-2005, 09:44 AM Go to last post
  1. 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: 3,924
    06-03-2007, 05:54 PM Go to last post
  2. 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: 1,958
    06-04-2007, 08:50 AM Go to last post
  3. 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: 3,262
    06-07-2007, 09:56 PM Go to last post
  4. 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: 4,238
    06-08-2007, 04:06 AM Go to last post
  5. 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: 2,173
    06-09-2007, 05:01 AM Go to last post
  6. 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: 2,123
    06-10-2007, 09:41 PM Go to last post
  7. 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: 3,912
    06-11-2007, 02:56 PM Go to last post
  8. 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: 24,484
    06-13-2007, 11:06 AM Go to last post
  9. 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: 6,116
    06-13-2007, 02:22 PM Go to last post
  10. 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: 2,590
    06-14-2007, 08:00 AM Go to last post
  11. 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: 2,816
    06-14-2007, 10:21 AM Go to last post
  12. 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
  13. 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: 21,948
    06-17-2007, 01:00 AM Go to last post
  14. 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: 3,167
    06-17-2007, 04:14 AM Go to last post
  15. 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: 4,881
    06-17-2007, 08:26 AM Go to last post
  16. 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: 2,594
    06-18-2007, 12:59 AM Go to last post
  17. 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: 2,320
    06-19-2007, 02:09 AM Go to last post
  18. 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: 4,088
    06-19-2007, 06:10 PM Go to last post
  19. 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: 1,967
    06-21-2007, 01:41 AM Go to last post
  20. 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: 6,071
    06-21-2007, 07:27 AM Go to last post
  21. 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: 3,223
    06-21-2007, 05:21 PM Go to last post
  22. 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: 2,057
    06-21-2007, 11:47 PM Go to last post
  23. 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: 2,259
    06-25-2007, 12:46 AM Go to last post
  24. 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: 2,856
    06-28-2007, 01:42 AM 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: 3,101
    06-29-2007, 08:43 AM Go to last post
  26. 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: 7,445
    07-03-2007, 12:20 PM Go to last post
  27. 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: 2,114
    07-03-2007, 12:58 PM Go to last post
  28. 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: 5,845
    07-03-2007, 01:08 PM 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: 24,984
    07-03-2007, 01:24 PM Go to last post
  30. 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: 4,454
    07-03-2007, 01:37 PM Go to last post
  31. 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: 2,559
    07-04-2007, 01:44 AM Go to last post
  32. 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: 5,418
    07-11-2007, 12:33 AM Go to last post
  33. 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: 4,859
    07-13-2007, 03:55 AM Go to last post
  34. 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: 2,532
    07-13-2007, 09:38 PM Go to last post
  35. 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: 2,548
    07-18-2007, 01:22 AM Go to last post
  36. 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: 4,372
    07-20-2007, 07:11 AM Go to last post
  37. 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: 2,877
    07-20-2007, 11:33 PM Go to last post
  38. 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: 5,820
    07-20-2007, 11:44 PM Go to last post
  39. 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: 3,878
    07-24-2007, 09:30 AM Go to last post
  40. 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: 3,515
    07-25-2007, 11:49 AM Go to last post
  41. 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: 2,345
    07-29-2007, 02:05 PM Go to last post
  42. 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: 3,370
    07-29-2007, 07:20 PM Go to last post
  43. 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: 4,801
    07-30-2007, 04:02 PM Go to last post
  44. 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: 2,059
    07-31-2007, 04:11 AM Go to last post
  45. 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: 3,567
    07-31-2007, 05:25 PM Go to last post
  46. 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: 3,146
    08-03-2007, 11:06 PM Go to last post
  47. 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: 2,438
    08-06-2007, 08:03 AM Go to last post
  48. 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: 2,124
    08-07-2007, 02:46 PM Go to last post
  49. 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: 2,502
    08-08-2007, 08:50 PM Go to last post
  50. PLEASE check~ Q2 of my assignment..

    I realli wana get all these correct. so...if anyone can also check my answers for question 2... Urn 1 contains 1 red, 3 green and 1 blue ball Urn...

    Started by pluto‎, 08-08-2007 08:53 PM
    • Replies: 0
    • Views: 1,981
    08-08-2007, 08:53 PM Go to last post
  51. Help!

    Hey! I have repeat exams coming up now in a couple of weeks and need some help in different questions! If i gave you my email address would you be...

    Started by xxalaine44xx‎, 08-12-2007 08:57 AM
    • Replies: 0
    • Views: 1,778
    08-12-2007, 08:57 AM Go to last post
  52. 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: 2,566
    08-13-2007, 12:56 PM Go to last post
  53. 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: 2,398
    08-13-2007, 03:40 PM Go to last post
  54. 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: 3,273
    08-16-2007, 09:44 AM Go to last post
  55. 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: 4,552
    08-17-2007, 08:06 AM Go to last post
  56. 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: 5,038
    08-21-2007, 11:13 AM Go to last post
  57. Erlang-k where k is Negative Binomial

    I have a stochastic process where calls have exponential interarrival times with parameter L and I have a stationary probability, p, that a call is...

    Started by Bob Gremley‎, 08-28-2007 10:35 AM
    • Replies: 0
    • Views: 2,667
    08-28-2007, 10:35 AM Go to last post
  58. Probability of 4 byte random occuring in 64K

    I would like to replace the NULLs in some compressed data with a sequence of bytes. The maximum size of the data is 64K bytes (each byte is a...

    Started by gmrobert‎, 08-29-2007 12:40 PM
    • Replies: 0
    • Views: 2,580
    08-29-2007, 12:40 PM Go to last post
  59. I don't know where to start.

    Hi, I need to know how to figure out a question, I am hoping that someone can help me. The question is: there are 3 boxes that generate random...

    Started by whitneyb‎, 08-29-2007 03:30 PM
    • Replies: 0
    • Views: 2,350
    08-29-2007, 03:30 PM Go to last post
  60. 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: 2,366
    09-03-2007, 03:24 AM Go to last post

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