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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: 30,213
    09-30-2005, 09:44 AM Go to last post
  1. 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: 2,703
    10-09-2008, 02:28 PM Go to last post
  2. 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: 2,024
    10-09-2008, 12:55 PM Go to last post
  3. 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: 2,508
    10-09-2008, 11:21 AM Go to last post
  4. 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: 3,373
    10-09-2008, 08:27 AM Go to last post
  5. 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: 3,287
    10-08-2008, 09:27 PM Go to last post
  6. 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: 2,976
    10-08-2008, 10:14 AM Go to last post
  7. 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: 4,311
    10-08-2008, 10:02 AM Go to last post
  8. 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: 4,274
    10-08-2008, 02:13 AM Go to last post
  9. 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: 2,707
    10-08-2008, 12:13 AM Go to last post
  10. 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: 3,035
    10-08-2008, 12:09 AM Go to last post
  11. 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: 2,403
    10-07-2008, 10:06 PM Go to last post
  12. 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: 3,048
    10-05-2008, 11:36 PM Go to last post
  13. 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: 5,235
    10-05-2008, 04:18 PM Go to last post
  14. 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: 5,123
    10-04-2008, 09:14 PM Go to last post
  15. 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: 2,424
    10-04-2008, 05:06 PM Go to last post
  16. 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: 4,131
    10-04-2008, 05:00 PM Go to last post
  17. 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: 2,182
    10-04-2008, 04:17 PM Go to last post
  18. 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: 2,171
    10-04-2008, 03:53 PM Go to last post
  19. 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: 6,362
    10-03-2008, 04:50 PM Go to last post
  20. 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: 1,891
    10-03-2008, 12:51 PM Go to last post
  21. 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: 2,007
    10-02-2008, 07:09 PM Go to last post
  22. 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: 2,631
    10-01-2008, 12:13 PM Go to last post
  23. 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: 1,948
    10-01-2008, 07:23 AM Go to last post
  24. 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: 2,995
    09-30-2008, 10:25 AM 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: 3,459
    09-29-2008, 06:01 PM Go to last post
  26. 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: 2,823
    09-28-2008, 06:29 PM Go to last post
  27. 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: 3,160
    09-28-2008, 01:56 PM Go to last post
  28. 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: 6,901
    09-28-2008, 12:42 AM Go to last post
  29. 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: 3,090
    09-26-2008, 08:50 AM Go to last post
  30. 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: 2,656
    09-26-2008, 08:10 AM Go to last post
  31. 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: 2,207
    09-25-2008, 02:46 AM Go to last post
  32. 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: 6,154
    09-24-2008, 10:00 AM Go to last post
  33. 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: 5,189
    09-22-2008, 11:42 PM Go to last post
  34. 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: 2,884
    09-22-2008, 10:04 AM Go to last post
  35. 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: 2,255
    09-20-2008, 09:32 PM Go to last post
  36. 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: 2,397
    09-20-2008, 12:20 PM Go to last post
  37. 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: 2,998
    09-19-2008, 04:13 AM Go to last post
  38. 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: 3,270
    09-18-2008, 04:56 PM Go to last post
  39. 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: 2,328
    09-18-2008, 01:34 AM Go to last post
  40. 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: 2,469
    09-15-2008, 09:23 AM Go to last post
  41. 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: 2,512
    09-15-2008, 04:13 AM Go to last post
  42. 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: 4,875
    09-14-2008, 02:50 PM Go to last post
  43. 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: 2,717
    09-11-2008, 12:43 PM Go to last post
  44. 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: 2,406
    09-10-2008, 07:13 PM Go to last post
  45. 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: 8,860
    09-10-2008, 06:53 PM Go to last post
  46. 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: 5,110
    09-09-2008, 03:01 PM Go to last post
  47. 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: 3,826
    09-09-2008, 03:51 AM Go to last post
  48. 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: 2,565
    09-09-2008, 01:40 AM Go to last post
  49. 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: 5,170
    09-05-2008, 11:31 AM Go to last post
  50. random variable?

    A graduating senior seeking a job has interviews with two companies. After the interview, he estimates that his chance of getting an offer from the...

    Started by chrischin478‎, 09-03-2008 11:08 PM
    • Replies: 3
    • Views: 3,734
    09-04-2008, 07:10 AM Go to last post
  51. Joint distribution of noncentral t statistics

    Hi, I need to compute a probability which is described by the joint distibution of 2 non-central t statistics. If somemody knows references...

    Started by Bel Duarte‎, 08-28-2008 08:56 AM
    • Replies: 4
    • Views: 2,459
    09-03-2008, 10:30 AM Go to last post
  52. Statistic question, what equation???

    Suppose I have these measurements: 21, 21.4, 22, 21.3, 22, 22.7, 25. What formula do I use to determine the probability that either 21.3 or 22.5 will...

    Started by Statattacker‎, 08-31-2008 10:15 AM
    • Replies: 1
    • Views: 1,778
    09-03-2008, 02:20 AM Go to last post
  53. Red face Stats probability

    A bag initially contained 4 white marbles and 9 black marbles. A marble was drawn and replaced by 2 marbles.. of the opposite colour.. Then...

    Started by Janiffer‎, 08-29-2008 02:52 AM
    • Replies: 5
    • Views: 3,814
    09-02-2008, 09:25 AM Go to last post
  54. Expectation of sorted random variables

    Hi all, I'm stuck on what I thought was a simple problem that appears to be somewhat trickier than I expected, and am hoping someone can point me...

    Started by Heywood‎, 08-29-2008 07:48 AM
    • Replies: 1
    • Views: 3,113
    09-02-2008, 06:13 AM Go to last post
  55. de Morgan's law

    I need help. I just can't figure out where to go with this one.. For two events A and B show that: P(A intersection B) is greater than or...

    Started by tyankee‎, 09-01-2008 03:56 PM
    • Replies: 1
    • Views: 4,805
    09-02-2008, 03:12 AM Go to last post
  56. calculation of a probability

    Hi there, I have the following problem: Suppose that: X~Exp(3) Y=bernoulli(p), where p=exp(x)/(1+exp(x)). What is P(Y=1|X>2)=??? (or...

    Started by leo nidas‎, 08-31-2008 01:47 PM
    • Replies: 2
    • Views: 2,483
    09-01-2008, 02:41 AM Go to last post
  57. Dice roll

    Sorry if this topic has been discussed before. I hate looking through forums randomly for an answer to a question. So, maybe one of you could help...

    Started by lookoverhear‎, 08-29-2008 07:18 PM
    • Replies: 6
    • Views: 2,611
    08-29-2008, 10:21 PM Go to last post
  58. Question if p( x|y)=p( y|x)=1

    x, y, a are all rv, and a=/x, y, p(x|a)=/0 is p(x|a)=p(y|a)? Thanks!

    Started by martinkhuu‎, 08-28-2008 06:12 PM
    • Replies: 0
    • Views: 2,373
    08-28-2008, 06:12 PM Go to last post
  59. Probabilty of picking higher number

    I am working on a webbased game, and need help with some probability. Player A rolls a 20 sided die with the numbers 1 through 20. Player B rolls...

    Started by coolant‎, 07-23-2008 06:49 PM
    • Replies: 12
    • Views: 3,537
    08-28-2008, 12:02 AM Go to last post
  60. Need to find the distribution function

    I have a probability function, and I would need the distribution for it, so I can calculate confidence intervalls. A nominal variable X can take R...

    Started by Goran_L‎, 08-21-2008 03:17 AM
    • Replies: 2
    • Views: 2,772
    08-27-2008, 03:13 AM Go to last post

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