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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: 30,178
    09-30-2005, 09:44 AM Go to last post
  1. 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: 2,655
    10-26-2007, 03:29 AM Go to last post
  2. 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: 3,656
    10-27-2007, 03:36 AM Go to last post
  3. 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: 5,102
    10-27-2007, 05:37 PM Go to last post
  4. 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: 2,298
    10-27-2007, 11:08 PM Go to last post
  5. 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: 2,876
    10-28-2007, 08:09 AM Go to last post
  6. 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: 4,643
    10-28-2007, 03:06 PM Go to last post
  7. 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: 3,489
    10-28-2007, 03:14 PM Go to last post
  8. 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: 3,020
    10-28-2007, 05:07 PM Go to last post
  9. 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: 4,078
    10-28-2007, 06:31 PM Go to last post
  10. 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: 2,515
    10-29-2007, 01:13 AM Go to last post
  11. 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: 2,279
    10-29-2007, 11:43 AM Go to last post
  12. 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: 2,904
    10-29-2007, 10:00 PM Go to last post
  13. 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: 2,638
    10-31-2007, 08:38 PM Go to last post
  14. 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: 3,813
    11-02-2007, 09:26 PM Go to last post
  15. 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: 2,725
    11-03-2007, 03:24 AM Go to last post
  16. 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: 4,940
    11-04-2007, 07:12 AM Go to last post
  17. 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: 3,737
    11-05-2007, 07:29 AM Go to last post
  18. 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: 9,732
    11-06-2007, 08:25 PM Go to last post
  19. 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: 2,964
    11-07-2007, 07:59 AM Go to last post
  20. 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: 2,588
    11-07-2007, 06:11 PM Go to last post
  21. 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: 2,846
    11-08-2007, 02:18 PM Go to last post
  22. 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: 3,744
    11-08-2007, 02:26 PM Go to last post
  23. 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: 5,113
    11-08-2007, 02:45 PM Go to last post
  24. 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: 4,046
    11-08-2007, 05:58 PM Go to last post
  25. 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: 2,782
    11-09-2007, 01:40 PM Go to last post
  26. 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: 2,786
    11-13-2007, 06:08 PM Go to last post
  27. 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: 3,158
    11-14-2007, 12:11 AM Go to last post
  28. 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: 3,286
    11-15-2007, 10:43 AM Go to last post
  29. 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: 2,360
    11-15-2007, 10:09 PM Go to last post
  30. 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: 4,203
    11-15-2007, 10:15 PM Go to last post
  31. 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: 2,639
    11-15-2007, 10:22 PM Go to last post
  32. 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: 2,802
    11-16-2007, 12:55 PM Go to last post
  33. 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: 3,252
    11-16-2007, 01:23 PM Go to last post
  34. 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: 2,788
    11-17-2007, 06:11 AM Go to last post
  35. 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: 2,372
    11-26-2007, 11:05 AM Go to last post
  36. 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: 2,766
    11-27-2007, 11:23 PM Go to last post
  37. 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: 2,267
    11-28-2007, 03:23 PM Go to last post
  38. 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: 4,198
    11-28-2007, 11:09 PM Go to last post
  39. 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: 2,710
    12-04-2007, 12:47 PM Go to last post
  40. 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: 2,602
    12-05-2007, 11:09 PM Go to last post
  41. 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: 5,396
    12-06-2007, 03:58 PM Go to last post
  42. 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: 3,536
    12-06-2007, 04:07 PM Go to last post
  43. 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: 4,136
    12-07-2007, 12:49 PM Go to last post
  44. 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: 2,802
    12-10-2007, 10:27 AM Go to last post
  45. 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: 2,856
    12-10-2007, 12:30 PM Go to last post
  46. 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: 3,286
    12-10-2007, 02:49 PM Go to last post
  47. 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: 3,171
    12-11-2007, 07:07 AM Go to last post
  48. 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: 4,008
    12-11-2007, 04:39 PM Go to last post
  49. !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: 3,210
    12-11-2007, 04:49 PM Go to last post
  50. simple combinatorics problem

    this problem has been solved, please delete this post

    Started by krappyappy‎, 12-12-2007 11:27 PM
    • Replies: 0
    • Views: 2,708
    12-12-2007, 11:27 PM Go to last post
  51. 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: 2,769
    12-13-2007, 07:16 AM Go to last post
  52. 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: 2,378
    12-13-2007, 11:39 AM Go to last post
  53. 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: 3,917
    12-14-2007, 10:58 AM Go to last post
  54. 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: 3,208
    12-14-2007, 07:45 PM Go to last post
  55. Mutual Information and Probability

    Hi, This is my first post in this forum :) I have some knowledge on statistics and probability but im stuck on a experiment im doing. ...

    Started by juanchoc‎, 12-17-2007 02:03 PM
    • Replies: 0
    • Views: 4,246
    12-17-2007, 02:03 PM Go to last post
  56. Probability / Conditional Prob.

    Above is the question I'm trying to figure out.... I'm not sure if I'm correct, but attempting the problems results in: a. P<38 = .92 b....

    Started by Aeokie165‎, 12-18-2007 08:21 PM
    • Replies: 0
    • Views: 2,902
    12-18-2007, 08:21 PM Go to last post
  57. Scrabble probability question?

    I have a question for you probability and statistics experts out there. At the beginning of scrabble to determine who starts, each person (in this...

    Started by blahb‎, 10-04-2007 01:11 PM
    • Replies: 4
    • Views: 9,105
    12-21-2007, 04:22 PM Go to last post
  58. Inverse gamma distributions & simulated annealing

    I've hit a problem trying to sample an inverse gamma distribution, 'scaled' using a temperature variable, T. If my distribution is defined as (where...

    Started by tbishop‎, 12-24-2007 07:16 AM
    • Replies: 0
    • Views: 2,818
    12-24-2007, 07:16 AM Go to last post
  59. really stuck

    :( hello all. I am really struggling with analysing my data which i have collected for my report. I am using a 2 x 2 mixed ANOVA and i am not sure...

    Started by sophie786‎, 12-26-2007 05:14 PM
    • Replies: 0
    • Views: 2,451
    12-26-2007, 05:14 PM Go to last post
  60. binomial distribution

    A "thinking" question I need help with regarding binomial distributions and I have no clue what they mean. Please help!! I can do the problems O.K....

    Started by cmojito‎, 12-29-2007 10:36 PM
    • Replies: 0
    • Views: 3,780
    12-29-2007, 10:36 PM Go to last post

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