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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: 30,406
    09-30-2005, 09:44 AM Go to last post
  1. Card Problem--(More than meets the eye...hopefully)

    Hmm, wondering if anyone can solve this problem, and possibly know which game show it came from: Say that you have 3 cards you can choose from:...

    Started by cytoplasmic‎, 12-14-2007 03:27 AM
    • Replies: 2
    • Views: 3,273
    12-14-2007, 07:45 PM Go to last post
  2. Question Hi, Emergency Help for Final Please!!

    8 basketball players are to be selected to play in a special game. The players will be selected from a list of 27 players.If the players are...

    Started by northport24‎, 12-10-2007 07:01 PM
    • Replies: 3
    • Views: 3,990
    12-14-2007, 10:58 AM Go to last post
  3. Help on my final project Please!

    All questions seem to be connected to one another. I think I have been able to work out questions 1 and 2. I have however,spent hours trying to...

    Started by tina82‎, 12-13-2007 11:39 AM
    • Replies: 0
    • Views: 2,406
    12-13-2007, 11:39 AM Go to last post
  4. Help in exponential dist..

    Hi, I have a question like that below, Suppose daily demand for gas is an exponential random variable with mean 5000 liters.Each day yhe tank...

    Started by SwordTR‎, 12-12-2007 01:20 PM
    • Replies: 1
    • Views: 2,793
    12-13-2007, 07:16 AM Go to last post
  5. simple combinatorics problem

    this problem has been solved, please delete this post

    Started by krappyappy‎, 12-12-2007 11:27 PM
    • Replies: 0
    • Views: 2,759
    12-12-2007, 11:27 PM Go to last post
  6. !HELP! in PROBABILITY Question! Please!

    A Level Statistics Question (Probability) Q. In a class, 25% of students are British and 55% are American. If 15% are both British & American,...

    Started by omercheema‎, 11-25-2007 10:06 AM
    • Replies: 1
    • Views: 3,244
    12-11-2007, 04:49 PM Go to last post
  7. Cool Probability Distribution

    I have no clue. I need help solving this problem: About 71% of the student generally pass the psych. class. This semester 88 students took the...

    Started by youngfye‎, 11-11-2007 08:18 PM
    • Replies: 2
    • Views: 4,108
    12-11-2007, 04:39 PM Go to last post
  8. Probability comparing confidence intervals/usability designs

    Note: I don't have a background in statistics, so please bear with me I am with a very small company split-running two web site designs at a time...

    Started by etenebris‎, 12-11-2007 07:07 AM
    • Replies: 0
    • Views: 3,225
    12-11-2007, 07:07 AM Go to last post
  9. z and standard normal variable...

    I have a question on my homework...I'm not looking for the answer, just how to find it... If Z is a standard normal variable how would you find the...

    Started by jochowschmoley@yahoo.com‎, 12-10-2007 02:25 PM
    • Replies: 1
    • Views: 3,350
    12-10-2007, 02:49 PM Go to last post
  10. Triangle Inequlity???

    Good evenings everybody. (It's night in my country :) ) I 'm struggling with a well-known inequlity known as triangle inequality but the variance and...

    Started by korhan.x‎, 12-07-2007 09:59 AM
    • Replies: 2
    • Views: 2,868
    12-10-2007, 12:30 PM Go to last post
  11. basic probability query

    I have two datasets each with 18 unique records. I am using a randomising function to assign numbers from 1 to 18 for each table and then join them...

    Started by kdt2006‎, 12-07-2007 11:36 AM
    • Replies: 3
    • Views: 2,852
    12-10-2007, 10:27 AM Go to last post
  12. I would just like the answers so I can work backwards and know how to do it

    The question is: Shutouts in the National Hockey League occur randomly and independently at a rate of 1 every 20 games. Calculate the probablity...

    Started by frankiee‎, 11-25-2007 02:49 PM
    • Replies: 2
    • Views: 4,197
    12-07-2007, 12:49 PM Go to last post
  13. Probability - mean, and deviation

    A scale designed so that when items are weighed, the errors in the indicated weights are normally distributed with a mean 0g and a standard deviation...

    Started by BMarks‎, 12-06-2007 04:07 PM
    • Replies: 0
    • Views: 3,586
    12-06-2007, 04:07 PM Go to last post
  14. collect sales taxes on items purchased through the internet

    Many states are carefully considering steps that would help them collect sales taxes on items purchased through the internet. How many randomly...

    Started by BMarks‎, 12-06-2007 03:58 PM
    • Replies: 0
    • Views: 5,481
    12-06-2007, 03:58 PM Go to last post
  15. Probability

    I'll give you the questions, and my answers. I'm not sure if they're right. A disease is estimated to affect 1% of the population. The sensitivity...

    Started by Oceans‎, 12-05-2007 11:09 PM
    • Replies: 0
    • Views: 2,699
    12-05-2007, 11:09 PM Go to last post
  16. Please Help !

    Find the stationary distribution for a markov chain with two states 1,2 and 0 < P11 = a < 1,0 < P22 = b < 1. Use the balance of flows to and from...

    Started by atrangi‎, 12-04-2007 12:47 PM
    • Replies: 0
    • Views: 2,766
    12-04-2007, 12:47 PM Go to last post
  17. Probabilities involving sample means

    I'm having trouble with this, I need help! I construe that the heights of hobbits are approximately normally distributed with mean 36 inches and...

    Started by chicklet0323‎, 11-28-2007 11:09 PM
    • Replies: 0
    • Views: 4,262
    11-28-2007, 11:09 PM Go to last post
  18. Probability question

    Scenario 8 cars use a private drive to join a local road Peak time for traffic leaving drive is 7-9am and 5-7pm Assume 4 of cars are used for...

    Started by weller‎, 11-28-2007 03:23 PM
    • Replies: 0
    • Views: 2,278
    11-28-2007, 03:23 PM Go to last post
  19. dice probability question

    I have a game that requires rolling 16 sided dice numbered 0-15. I would like to know the probability of rolling a sum of less then 20 using four...

    Started by nod2003‎, 11-27-2007 11:23 PM
    • Replies: 0
    • Views: 2,816
    11-27-2007, 11:23 PM Go to last post
  20. please .. I want a help in two Q

    I have a 2 problems in probability please help me to solve it :( 1\ A college have 5 math sections ,if we distribute another 4 students to...

    Started by rawa‎, 11-26-2007 11:05 AM
    • Replies: 0
    • Views: 2,405
    11-26-2007, 11:05 AM Go to last post
  21. Need help with probability

    I have a problem that I DO NOT know what method to use to develop the answer here is my attempted solution, but I want affirmation from a pro. Q:...

    Started by agent2592‎, 11-16-2007 11:03 PM
    • Replies: 1
    • Views: 2,849
    11-17-2007, 06:11 AM Go to last post
  22. I need help so bad (transform)

    Muestre la transformacion Box-Muller: Sean U1;U2, v.a.i.i.d. (independant, identically distribuited random variables) with Ui ~ unif(0; 1) y define...

    Started by EqJulian‎, 11-16-2007 01:23 PM
    • Replies: 0
    • Views: 3,303
    11-16-2007, 01:23 PM Go to last post
  23. Can't figure out the correct formula

    We do a lot of A/B(/C...) testing on our e-commerce sites. I'm putting together a dashboard to display the results from the testing. But I can't come...

    Started by topout‎, 11-10-2007 01:12 PM
    • Replies: 1
    • Views: 2,830
    11-16-2007, 12:55 PM Go to last post
  24. Unhappy Totally lost

    I am totally lost in my intro to statistics and probability course at this point. I try to get help from my TA but he doesn't even speak english...

    Started by Joshua0317‎, 11-08-2007 02:05 PM
    • Replies: 1
    • Views: 2,676
    11-15-2007, 10:22 PM Go to last post
  25. Combination/Permutation???

    Ok here is the problem I have four m$ms and three friends How many ways can i divide the m&ms considering i can give each friend 0, 1, 2, 3 or...

    Started by gobulldogs‎, 11-12-2007 07:22 PM
    • Replies: 1
    • Views: 4,263
    11-15-2007, 10:15 PM Go to last post
  26. Am I right?

    :confused: Here is the Question. The probablity that one of your new batch of printers will break down has been an unacceptable 0.2 each day. You...

    Started by daxiusa‎, 11-13-2007 04:33 PM
    • Replies: 1
    • Views: 2,377
    11-15-2007, 10:09 PM Go to last post
  27. Smile Urgently Need Help.

    I can't seem to figure this problem out. 125 employees in a company. The following probability distribution shows the likelihood that people were...

    Started by omramos‎, 11-12-2007 10:34 PM
    • Replies: 2
    • Views: 3,330
    11-15-2007, 10:43 AM Go to last post
  28. Probability of rolling a 1 10% or less over # of trials?

    Hey guys, It's been years since I've taken a stats class and just need a refresher on how to calculate a problem of this form. Specifically, I'm...

    Started by aufvr‎, 11-14-2007 12:11 AM
    • Replies: 0
    • Views: 3,261
    11-14-2007, 12:11 AM Go to last post
  29. Question There's a 70% chance this is an easier question to figure out

    Hey all, I started playing this new card game, which uses 4 standard decks of cards, with jokers (total of 216 cards). Suits do not matter in...

    Started by LakersCentral‎, 11-01-2007 08:09 PM
    • Replies: 2
    • Views: 2,824
    11-13-2007, 06:08 PM Go to last post
  30. Joint distribution question

    Let X and Y be independent random variables with an exponential distribution with parameters and λ (note that the exponential distribution is given...

    Started by corny1355‎, 11-09-2007 01:40 PM
    • Replies: 0
    • Views: 2,833
    11-09-2007, 01:40 PM Go to last post
  31. Statistics question help! Stuck!

    I have a question regarding statiscs. Here is some information: A case of 600 past negligence cases showed 80% of the plantiffs were awarded...

    Started by inphluence‎, 11-08-2007 05:58 PM
    • Replies: 0
    • Views: 4,109
    11-08-2007, 05:58 PM Go to last post
  32. Discrete Probability

    I am not sure if I am doing this question right so I just want to verify. Viruses such as Trojan programs and worms, reach networks by requests...

    Started by sp00ky‎, 11-03-2007 06:59 PM
    • Replies: 1
    • Views: 5,177
    11-08-2007, 02:45 PM Go to last post
  33. Question Probability question-using binomial expansion

    The question is: You have a special 12-sided die. You roll the die 5 times. What is the probability of getting either 2, 3, or 4 "eights" in those...

    Started by Whysper‎, 11-04-2007 10:47 PM
    • Replies: 1
    • Views: 3,802
    11-08-2007, 02:26 PM Go to last post
  34. Probability Distribution

    I am having difficulty solving this problem and was wondering if anyone can help me out. The manager of a soft drink bottling company believes that...

    Started by sp00ky‎, 11-07-2007 03:36 PM
    • Replies: 1
    • Views: 2,876
    11-08-2007, 02:18 PM Go to last post
  35. Probability question!!

    How do we use z-scores to compute the probability of normally distributed, continuous variables? Does it have to do with the pearson r...

    Started by db451‎, 11-07-2007 06:11 PM
    • Replies: 0
    • Views: 2,625
    11-07-2007, 06:11 PM Go to last post
  36. I dont think i'm finding probability correctly...please help!

    (10) The New Brew Pub manufactures and distributes three types of beers: a low-calorie light beer, a regular beer, and a dark beer. To investigate...

    Started by shila‎, 11-07-2007 06:52 AM
    • Replies: 1
    • Views: 3,018
    11-07-2007, 07:59 AM Go to last post
  37. p-value

    Can anyone tell me what a p-value of .000 means in layman terms?

    Started by aeckland‎, 11-05-2007 04:18 PM
    • Replies: 1
    • Views: 9,849
    11-06-2007, 08:25 PM Go to last post
  38. Please Help!

    So I missed last weeks lecture in Statistics, but got the homework. I thought I understood what was going on, but maybe not. Here is the problem...

    Started by aeternus14‎, 11-02-2007 07:29 AM
    • Replies: 2
    • Views: 3,808
    11-05-2007, 07:29 AM Go to last post
  39. Discrete Probability

    Suppose that X is a normal random variable with mean 5. If P{X>9} = 0.2, approximately what is Var(X)?

    Started by hellostats‎, 11-04-2007 12:12 AM
    • Replies: 1
    • Views: 5,016
    11-04-2007, 07:12 AM Go to last post
  40. Interesting Problem

    Hi this is my first post on your forums so I apologize if I'm putting this in the wrong place :) This is a fairly complex, multi-aspect question...

    Started by Lacrouso‎, 11-03-2007 03:24 AM
    • Replies: 0
    • Views: 2,754
    11-03-2007, 03:24 AM Go to last post
  41. Hurricane name contest Blows up the odds

    Recently a contest was held to see if anyone could pick a couple of storms from this years Two questions were asked of the contributors: 1)...

    Started by Raptor Witness‎, 10-13-2007 02:36 PM
    • Replies: 3
    • Views: 3,930
    11-02-2007, 09:26 PM Go to last post
  42. Hello i am redoing an assignmnet which i failed and i am having the following problem

    Here's my assignment: Question #1) Consider that it is well known that the probability that someone contracted chickenpox when they were young in...

    Started by x2006nzl‎, 10-31-2007 08:29 PM
    • Replies: 1
    • Views: 2,654
    10-31-2007, 08:38 PM Go to last post
  43. Smile Confidence Interval for N Observations?

    I have a Statistics/Probability question that isn't homework, but a true life example. Some posters on another messageboard are predicting the...

    Started by TigerBomb‎, 10-29-2007 10:00 PM
    • Replies: 0
    • Views: 2,946
    10-29-2007, 10:00 PM Go to last post
  44. non-independent RV

    Hi, Let's say I have a binary experiment where the outcome has a 60% chance of being positive and a 40% chance of being negative. The outcome of...

    Started by marksman‎, 10-29-2007 11:43 AM
    • Replies: 0
    • Views: 2,320
    10-29-2007, 11:43 AM Go to last post
  45. easy peasy

    Hello I was wondering if I could some help with this question. I am good at the hard stuff but it is the simple things like this which perplex me. ...

    Started by slevvio‎, 10-25-2007 04:14 AM
    • Replies: 1
    • Views: 2,563
    10-29-2007, 01:13 AM Go to last post
  46. Corrected significance level in Tukey HSD post-hocs?

    Dear all, I have a question that is really bugging me: I'm testing if seed set in one plant species is impacted by the deposition of pollen...

    Started by crazy_man‎, 10-24-2007 08:33 AM
    • Replies: 1
    • Views: 4,116
    10-28-2007, 06:31 PM Go to last post
  47. help!!! Gaussian and exponential random variable

    Let Xn be independent identically distributed Gaussian random variables with mean zero and variane one. Let Yn be independent identically distributed...

    Started by violetsf‎, 10-28-2007 05:07 PM
    • Replies: 0
    • Views: 3,055
    10-28-2007, 05:07 PM Go to last post
  48. sampling with replacement/central limit thereom

    Hi! The question states: Suppose that you pick 16 digits at random with replacement from the set {0,1,2....9}, what is the probability that their...

    Started by Seratina‎, 10-28-2007 03:14 PM
    • Replies: 0
    • Views: 3,549
    10-28-2007, 03:14 PM Go to last post
  49. central limit theorem question check?

    Hi! The question states: "Suppose that, historically, one-third of the graduating seniors at a certain college have two parents who attend the...

    Started by Seratina‎, 10-28-2007 03:06 PM
    • Replies: 0
    • Views: 4,689
    10-28-2007, 03:06 PM Go to last post
  50. any body help me please !!! tomorrow i ave exam but now I don't understand

    any body help me Two stocks, A and B, are known to be related. The probability that stock A will go up tomorrow is 0.20 and the probability that...

    Started by venis1010‎, 10-28-2007 08:09 AM
    • Replies: 0
    • Views: 2,890
    10-28-2007, 08:09 AM Go to last post
  51. Exclamation Poisson Question.... Please help....

    Shutouts in the NHL occur randomly and independently at the rate of 1 every 20 games. A) 2 in the next 10 games B) 25 in 400 Games c) a shutout...

    Started by RenDen‎, 10-27-2007 11:08 PM
    • Replies: 0
    • Views: 2,351
    10-27-2007, 11:08 PM Go to last post
  52. pemutation

    how many permutations of three items can be selected from a group of six? Us the letters A, B, C, D, E, and F to identify the items, and list each...

    Started by mpc2000‎, 10-27-2007 05:37 PM
    • Replies: 0
    • Views: 5,156
    10-27-2007, 05:37 PM Go to last post
  53. Probability!! please help me, I don't understand

    Dear all Please help me The chancellor state university is applying for a new position. At a certain point in his application process, he is...

    Started by venis1010‎, 10-25-2007 11:17 PM
    • Replies: 3
    • Views: 3,757
    10-27-2007, 03:36 AM Go to last post
  54. combinations/permutations

    It's for Finite Math and we're dealing with combinations, permutations, and all that good stuff. Here we go: Suppose there are 3 U.S....

    Started by guitargod2112‎, 10-26-2007 03:29 AM
    • Replies: 0
    • Views: 2,704
    10-26-2007, 03:29 AM Go to last post
  55. probability and binomial random variable

    A state end-of-grade exam in American History is a multiple-choice test that has 50 questions with 4 answer choices for each question. A student must...

    Started by agclifto‎, 10-24-2007 09:44 PM
    • Replies: 0
    • Views: 4,052
    10-24-2007, 09:44 PM Go to last post
  56. Normal distribution investment problems

    I am new to this messageboard and I really need help with these two problems. Problem #1 You make an investment. Assume that returns are...

    Started by jamibimbi‎, 10-23-2007 06:17 PM
    • Replies: 1
    • Views: 3,475
    10-24-2007, 01:01 AM Go to last post
  57. Really Easy Question

    This is a basic question about probabilities, specifically what kind of test to use. I think I am close to an answer, but I am not sure. The idea...

    Started by Brillow‎, 10-24-2007 12:24 AM
    • Replies: 0
    • Views: 2,834
    10-24-2007, 12:24 AM Go to last post
  58. Exclamation Expected Values and Variances!

    I'm an econ grad student stuck on a homework problem - I've been working on it for a couple of days now but am getting nowhere...and it's due...

    Started by jumboeconstudent‎, 10-23-2007 07:43 PM
    • Replies: 0
    • Views: 3,326
    10-23-2007, 07:43 PM Go to last post
  59. Probability issue

    I have a question with regard to a probability issue ; Assume a game that is played on a matrix composed of 120 squares. The game is played in 3...

    Started by smalco‎, 10-23-2007 07:22 AM
    • Replies: 1
    • Views: 2,149
    10-23-2007, 05:50 PM Go to last post
  60. conditional normal distribution

    Hi all First of all, I am new here but I am not new to statistics. But I need your help:cool: I do have a multivariate normal distribution:...

    Started by jstar‎, 10-22-2007 04:23 AM
    • Replies: 1
    • Views: 3,133
    10-22-2007, 08:38 AM Go to last post

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