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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: 30,381
    09-30-2005, 09:44 AM Go to last post
  1. Poisson with events per week for calculating probability per Quarter?

    Hi all, I have a question regarding the Poisson distribution. (I searched the forum before creating this post, I couldn't find a similar post) ...

    Started by RayDaniel‎, 09-05-2008 06:29 AM
    • Replies: 4
    • Views: 5,220
    09-05-2008, 11:31 AM Go to last post
  2. Gaming Problem

    A player starts of with 10 points. If he reaches 1000 points he wins. Every time he plays, the chance of him winning is 40% Maximum everytime,...

    Started by Gauri.Singh‎, 09-08-2008 09:29 AM
    • Replies: 3
    • Views: 2,591
    09-09-2008, 01:40 AM Go to last post
  3. Unhappy 1000 points Game

    Hi Guys, I got this problem from one of my friend. The problem is: A player starts of with 10 points. If he reaches 1000 points he wins. ...

    Started by vinux‎, 09-05-2008 06:32 AM
    • Replies: 1
    • Views: 3,864
    09-09-2008, 03:51 AM Go to last post
  4. Hopefully an easy 'first post'!

    Hi All. I'm a newbie to the forums, and will hopefully introduce myself with an eay-enough question on probability! OK, here goes: I have...

    Started by madnesstiger‎, 09-05-2008 07:28 AM
    • Replies: 14
    • Views: 5,150
    09-09-2008, 03:01 PM Go to last post
  5. problem where the teach doesnt teach

    I am not 100% sure how to even start this. With the 2 variable I get lost Please any help Human visual inspection of solder joints on printed...

    Started by thomason50‎, 09-09-2008 06:33 PM
    • Replies: 2
    • Views: 8,945
    09-10-2008, 06:53 PM Go to last post
  6. Post formulating probabilities

    Could anyone help? Please! Joe Smith batted .347 in 2007. So assume the probability of getting a hit is .347 for each time he batted. In a...

    Started by help72‎, 09-10-2008 03:02 PM
    • Replies: 1
    • Views: 2,438
    09-10-2008, 07:13 PM Go to last post
  7. sampling

    Hi, I have a problem which I am sure has an easy answer Imagine that I have a box which contains 100 balls, 99 blue and 1 red. I want to use...

    Started by moufa‎, 09-11-2008 12:37 PM
    • Replies: 2
    • Views: 2,753
    09-11-2008, 12:43 PM Go to last post
  8. basic proofs/results in regression

    I'm taking a regression class and were working on the location model just to get practice before the real thing. We've been given some proofs for HW...

    Started by learningstats‎, 09-14-2008 10:04 AM
    • Replies: 2
    • Views: 4,905
    09-14-2008, 02:50 PM Go to last post
  9. 99% CI for failure proportions

    Hi, Is this working correct for a 99% CI for the difference between two proportions: p(A) = 11 failures out of 200 p(B) = 6 failures out of...

    Started by Silvanus‎, 09-14-2008 08:15 PM
    • Replies: 1
    • Views: 2,548
    09-15-2008, 04:13 AM Go to last post
  10. Some Questions

    i) find a formula for the number of sequences of 0's and 1's of lenght n such that the sum of the 0's and 1's in the sequence is k ii) prove that...

    Started by jamesmartinn‎, 09-11-2008 04:55 PM
    • Replies: 6
    • Views: 2,484
    09-15-2008, 09:23 AM Go to last post
  11. Successive events in Trial

    The chance of tossing a coin and obtaining a tail is 1/2. The chance of tossing a coin and obtaining two sucessive tails is 1/4. The chance of...

    Started by MikeJ‎, 09-18-2008 01:10 AM
    • Replies: 1
    • Views: 2,350
    09-18-2008, 01:34 AM Go to last post
  12. Probability stack up

    First off just wanted to say :wave: to everyone as this is my first post. I am currently a student engineer and have been assigned a project...

    Started by hamilton‎, 09-16-2008 09:50 PM
    • Replies: 1
    • Views: 3,296
    09-18-2008, 04:56 PM Go to last post
  13. how determine correlation by looking at distributions?

    Hi Experts, I have an application related to DSP and probability/distributions I could *really* use some help with. I have a real-time...

    Started by ggk‎, 09-18-2008 09:16 PM
    • Replies: 1
    • Views: 3,031
    09-19-2008, 04:13 AM Go to last post
  14. please check

    X) How many different eleven-letter words (not necessairly pronounceable or meaningful) can be made from the letters in the word MISSISSIPPI? ANS:...

    Started by jamesmartinn‎, 09-15-2008 09:06 AM
    • Replies: 4
    • Views: 2,439
    09-20-2008, 12:20 PM Go to last post
  15. Explantion of this p[assword combination problem

    Q: A computer password must be 5 characters long, and must contain only letters and numbers. If you pick a password at random ( All valid passwords...

    Started by iamsevenup‎, 09-20-2008 06:14 PM
    • Replies: 1
    • Views: 2,282
    09-20-2008, 09:32 PM Go to last post
  16. independence

    p(a) = 0.1 and p(b) = 0.3 : assume these events are independent 1) prob of neither events occuring? I got 0.97 2) prob of at least one event...

    Started by jamesmartinn‎, 09-21-2008 08:53 PM
    • Replies: 4
    • Views: 2,903
    09-22-2008, 10:04 AM Go to last post
  17. Bayes Theorem Question

    Hello all, I have a homework question which I can not figure out: A stock market analyst examined the prospects of the shares of a large number...

    Started by furcal101‎, 09-22-2008 07:19 PM
    • Replies: 1
    • Views: 5,220
    09-22-2008, 11:42 PM Go to last post
  18. divide 2 chi square distribution

    Hi there, Can anyone help me with this?? : If X1~ X^2 distribution with n1 d.f. and X2~X^2 distribution with n2 d.f. then what is...

    Started by leo nidas‎, 09-24-2008 09:37 AM
    • Replies: 1
    • Views: 6,199
    09-24-2008, 10:00 AM Go to last post
  19. I need help/advice for a probability model, mainly distribution (not homework)

    I'm working on a baseball game projection model that I hope to have in full swing by next year. Anyway, the way I'm figuring out win probability now...

    Started by Longlorious‎, 09-25-2008 02:46 AM
    • Replies: 0
    • Views: 2,222
    09-25-2008, 02:46 AM Go to last post
  20. I need some help

    Hello everyone, I'm new here and this is my first post. I have a couple of problems I need help setting up. First; A group of 100 diabetic...

    Started by pugowner‎, 09-23-2008 11:10 AM
    • Replies: 3
    • Views: 2,676
    09-26-2008, 08:10 AM Go to last post
  21. Help Verifying Formulas

    Hey all, I'm a bit stuck at verifying these following formulas are equivalent: Prove: (n Choose k) = (n choose n-k) so I got: =...

    Started by jamesmartinn‎, 09-25-2008 03:16 PM
    • Replies: 3
    • Views: 3,132
    09-26-2008, 08:50 AM Go to last post
  22. poisson distribution help

    hey! i am having a hard time understanding this problem. i just need to know how to get started and then i am good from there. here is the...

    Started by rodizzl‎, 09-27-2008 03:41 PM
    • Replies: 1
    • Views: 6,965
    09-28-2008, 12:42 AM Go to last post
  23. Confidence Intervals

    Hi there, Can anyone help me with this question regarding confidence intervals? Q: 14.6% of New Zealanders identified with Maori ethnicity. For...

    Started by micco13‎, 09-27-2008 12:39 PM
    • Replies: 3
    • Views: 3,206
    09-28-2008, 01:56 PM Go to last post
  24. basic probability

    My assignment question gives me the following info regarding the probability of system having 3 types of defects (type A1, A2, and A3): P(A1)=...

    Started by andrewink‎, 09-28-2008 02:49 PM
    • Replies: 1
    • Views: 2,844
    09-28-2008, 06:29 PM Go to last post
  25. add chi square or F distributions yields?...

    Hi there, I have two questions: First: X1 follows X^2 distribution with n1 d.f. X2 follows X^2 distribution with n2 d.f. Then what is...

    Started by leo nidas‎, 09-29-2008 04:00 PM
    • Replies: 1
    • Views: 3,476
    09-29-2008, 06:01 PM Go to last post
  26. Rolling a pair of dice.

    http://www.cam.cornell.edu/~sharad/math407/midterm_sol.pdf I don't understand 3b. Why isn't the E1 union with E2 just sum of E1 and E2? I think...

    Started by iamsevenup‎, 09-29-2008 06:03 PM
    • Replies: 4
    • Views: 3,022
    09-30-2008, 10:25 AM Go to last post
  27. Help Please NORMSINV

    Hello, Here is the problem. Assume that your drive time to work each morning follows a normal distribution with Mean= 20 min 24 sec, and stdev=...

    Started by pugowner‎, 10-01-2008 07:23 AM
    • Replies: 0
    • Views: 1,967
    10-01-2008, 07:23 AM Go to last post
  28. Linear combination of empirical distributions for independent rvs

    Hi there, I have n independent rvs: X1, ..., Xn. I have obtained the empirical distribution functions F1, ..., Fn for each of the rv. Is it...

    Started by beninti‎, 10-01-2008 12:13 PM
    • Replies: 0
    • Views: 2,650
    10-01-2008, 12:13 PM Go to last post
  29. Weibull Distribution Help

    "The time to failure, unable to continue delivery service for a delivery truck, has a Weibull Distribution with mean of 200k miles and standard...

    Started by duder0464‎, 10-02-2008 07:09 PM
    • Replies: 0
    • Views: 2,021
    10-02-2008, 07:09 PM Go to last post
  30. Cdf

    Can someone explain how to solve this? I have to find the CDF for the following function: F(X) = 1/2 * Exp (-|X|) dx , (-inf < x < +inf) I know...

    Started by jamesmartinn‎, 10-03-2008 10:36 AM
    • Replies: 1
    • Views: 1,912
    10-03-2008, 12:51 PM Go to last post
  31. Normal distribution probability density function returning values > 1

    i am trying to draw a normal curve over a histogram of some data of mine and i just can't get it to come out right! Mean =1.002327404 Standard...

    Started by method‎, 10-02-2008 11:27 AM
    • Replies: 11
    • Views: 6,398
    10-03-2008, 04:50 PM Go to last post
  32. Probability: proving

    Show that two events A,B are independent if and only if at least one of the following holds i) P(A/B)=P(A) or P(B/A)=P(B) ii) P(A)=0 or P(B)=0

    Started by amjadsuhail‎, 10-04-2008 03:20 PM
    • Replies: 1
    • Views: 2,204
    10-04-2008, 03:53 PM Go to last post
  33. help me please

    My problem: Calculate the number of possible outcomes if 4 tickets are randomly selected from 50 tickets. There are 4 different prizes & a ticket...

    Started by kmont‎, 10-02-2008 02:07 PM
    • Replies: 1
    • Views: 2,212
    10-04-2008, 04:17 PM Go to last post
  34. Football Betting Method

    Say I have 3 betting methods on football games. Each system is able to predict the winner with 60% accuracy. Method1: 60% Method2: 60% Method3:...

    Started by shrek‎, 10-02-2008 03:20 AM
    • Replies: 1
    • Views: 4,183
    10-04-2008, 05:00 PM Go to last post
  35. probability help pugowner

    14. A study was made to determine the calories, total fat content and sodium in 54 brands of “veggie” burgers as shown below. < 130...

    Started by pugowner‎, 10-03-2008 09:40 PM
    • Replies: 5
    • Views: 2,449
    10-04-2008, 05:06 PM Go to last post
  36. Find the joint density of Z=X+Y,W=X-Y

    Question:Let X,Y be independent random variables with X~Exp(lambda1) and Y=~Exp(lambda2). Find the joint density of Z=X+Y,W=X-Y ...

    Started by amjadsuhail‎, 10-04-2008 03:14 PM
    • Replies: 1
    • Views: 5,154
    10-04-2008, 09:14 PM Go to last post
  37. problem so simple its confusing?? need help

    I need help with a homework problem. Because not all airline passengers show up for their reserved seat, an airline sells 125 tickets for a flight...

    Started by get5007‎, 10-05-2008 04:12 PM
    • Replies: 1
    • Views: 5,283
    10-05-2008, 04:18 PM Go to last post
  38. problem of tossing a coin -- plz help

    Three players A,B,C toss a fair coin in the order ABCABC... Find the probability that A is the first player to obtain a head, B the second & C the...

    Started by masim‎, 10-02-2008 02:59 AM
    • Replies: 1
    • Views: 3,099
    10-05-2008, 11:36 PM Go to last post
  39. Monty Hall

    You are playing a game show, in which there are prizes behind three doors. One prize is good (eg a car), and the others aren't (eg. a goat and a...

    Started by jamesmartinn‎, 10-07-2008 08:54 PM
    • Replies: 1
    • Views: 2,437
    10-07-2008, 10:06 PM Go to last post
  40. Find defective typewriters

    A batch of 50 different automatic typewriters contains exactly 10 defective machines. What is the probability of finding: a) At least 1 defective...

    Started by iwonde‎, 10-08-2008 12:09 AM
    • Replies: 0
    • Views: 3,065
    10-08-2008, 12:09 AM Go to last post
  41. Forming a committee

    How many ways can a committee be formed from four men and six women with four members, at least two of whom are women, and Mr. and Mrs. Baggins...

    Started by iwonde‎, 10-08-2008 12:13 AM
    • Replies: 0
    • Views: 2,741
    10-08-2008, 12:13 AM Go to last post
  42. Arranging letters

    What is the probability that an arrangement of a, b, c, e, f, g begins and ends with a vowel.

    Started by iwonde‎, 10-08-2008 01:42 AM
    • Replies: 1
    • Views: 4,302
    10-08-2008, 02:13 AM Go to last post
  43. Question Fitting joint distribution to empirical data

    I have a dataset of two correlated poisson variables X1 ~ Poisson(my1) X2 ~ Poisson(my2) Pr(X1,X2)<>Pr(X1)*Pr(X2) I would like to specify...

    Started by betso‎, 10-08-2008 10:02 AM
    • Replies: 0
    • Views: 4,361
    10-08-2008, 10:02 AM Go to last post
  44. Cossing Toins-Probability

    If I toss 10 coins, how do I find the probability that 8 of them will land on heads? Could someone help me out?

    Started by pc678‎, 10-07-2008 08:02 PM
    • Replies: 11
    • Views: 2,988
    10-08-2008, 10:14 AM Go to last post
  45. Help - Bayes theorem question.

    The sensitivity of a screening test is .95 and its specificity is .85. The rate of the disease for which the test is used is .002. What is the...

    Started by silentscreen‎, 10-08-2008 02:19 PM
    • Replies: 3
    • Views: 3,308
    10-08-2008, 09:27 PM Go to last post
  46. Even Sum Problem

    How many subsets of three different integers between 1 and 90 inclusive are there whose sum is an even number?

    Started by iwonde‎, 10-08-2008 02:14 AM
    • Replies: 7
    • Views: 3,391
    10-09-2008, 08:27 AM Go to last post
  47. Conditional Probability question

    okay the problem statement is as follows A gene can be either type A or type B (ie note type A). A gene can also be either dominant or regressive....

    Started by Creol‎, 10-08-2008 12:54 PM
    • Replies: 3
    • Views: 2,540
    10-09-2008, 11:21 AM Go to last post
  48. STA2023 Test question help

    9% of men, and 25% of women cannot distinguish between the colors red and green. THis is the type of color blindness that causes problems with...

    Started by jmpayne‎, 10-08-2008 06:08 PM
    • Replies: 2
    • Views: 2,036
    10-09-2008, 12:55 PM Go to last post
  49. HW help

    I have a probelm with one of my hw questions which is: A sample from a normal population has a standard deviation of 0.02. What is the...

    Started by corkscrew‎, 10-09-2008 02:28 PM
    • Replies: 0
    • Views: 2,745
    10-09-2008, 02:28 PM Go to last post
  50. Independent Events Occurring Simultaniously

    This should be an easy one for you smart guys: Consider a double computer intruder detection system (IDS) with system A and system B. If there is...

    Started by KitsuMathTard‎, 10-08-2008 09:18 PM
    • Replies: 6
    • Views: 9,056
    10-10-2008, 07:48 AM Go to last post
  51. Type II error

    I'm currently doing a statistics assigment. In one of the questions, i've been asked to "discuss" what the probability of a Type II error, what i...

    Started by resonance‎, 10-09-2008 07:00 PM
    • Replies: 10
    • Views: 7,415
    10-12-2008, 10:47 AM Go to last post
  52. Infinite sum

    Hi All- It has been a few years since my last calc class and now I am taking a course in mathematical stats. I have the discrete data pmf:...

    Started by B_Miner‎, 10-11-2008 08:17 PM
    • Replies: 4
    • Views: 3,120
    10-12-2008, 02:06 PM Go to last post
  53. Transformations of Random Variables

    Suppose X ~ U(-1,2). find the density of X^2 My soln so far: f(x)x = (1/3, -1<x<2. 0 elsewhere) My teacher tells us to find the CDF, then...

    Started by jamesmartinn‎, 10-09-2008 05:13 PM
    • Replies: 4
    • Views: 2,819
    10-12-2008, 05:06 PM Go to last post
  54. Conditional Probabillity- Check my work?

    Ok the problem goes like this: A small brewery has two bottling machines A & B. Machine A bottles 75% of all their bottles, and B bottles 25%. One...

    Started by KitsuMathTard‎, 10-12-2008 06:37 PM
    • Replies: 7
    • Views: 3,033
    10-13-2008, 04:49 PM Go to last post
  55. maximizing profit given pdf

    Here is the problem I came across while studying for the test and need some help: A retail grocer has a daily demand, Y for a certain product sold...

    Started by anna_s‎, 10-14-2008 08:34 AM
    • Replies: 2
    • Views: 6,748
    10-14-2008, 02:16 PM Go to last post
  56. Another problem for maximizing profit...

    Consider a store owner who buys items one day for $1.00 and sells them the same day for $1.50. Assume the item has no value the next day and that...

    Started by turd112‎, 10-15-2008 04:55 PM
    • Replies: 0
    • Views: 2,715
    10-15-2008, 04:55 PM Go to last post
  57. probability mass function

    You have 4 red jelly beans and 4 green jelly beans in a paper bag. Without looking, you will pick jelly beans, one at a time, from the bag and stop...

    Started by jamesmartinn‎, 10-15-2008 09:45 PM
    • Replies: 0
    • Views: 3,212
    10-15-2008, 09:45 PM Go to last post
  58. Null and alternate hypothesis

    Hi- I have a problem that begins, "Suppose you wish to test the null hypthesis that u=50 vs the alternate hypothesis that u<50...."and then it goes...

    Started by acarnle1‎, 10-15-2008 08:48 PM
    • Replies: 1
    • Views: 2,871
    10-15-2008, 09:49 PM Go to last post
  59. Find the value of x

    I am having trouble finding the value of x with this problem, because my teacher's example problems are a lot different! The question is A new...

    Started by tiffnnie01‎, 10-15-2008 03:06 PM
    • Replies: 1
    • Views: 10,587
    10-15-2008, 10:18 PM Go to last post
  60. Z-scores for probability in tails

    I haven't done any stats in years and now I am in a course for my grad program and I am so lost. My teacher is very confusing and I am trying my best...

    Started by rmbr2‎, 10-02-2008 01:18 PM
    • Replies: 3
    • Views: 24,020
    10-16-2008, 06:45 AM Go to last post

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