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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: 30,353
    09-30-2005, 09:44 AM Go to last post
  1. Cool okay need insight on this...

    I have attempted to work this out twice use 2 different formulas (1.interval estimation of a population mean (small-sample case) 2. interval...

    Started by ecohelp‎, 10-15-2005 12:04 PM
    • Replies: 4
    • Views: 3,546
    08-22-2011, 06:56 AM Go to last post
  2. Need a Probability Answer

    hello , i read a bit from the forum and i saw that i still do not have a answer to my propability question. The situation is like this How to...

    Started by k_rukov‎, 07-28-2011 07:11 PM
    • Replies: 8
    • Views: 4,952
    08-21-2011, 03:57 PM Go to last post
  3. Assignment Problem ((urgent))

    Hey all. I am having some difficulty with one question on an assignment I have been workiing on. I am quite new to stats and I cannot find a...

    Started by Georgyb‎, 08-20-2011 11:09 PM
    • Replies: 4
    • Views: 2,471
    08-21-2011, 01:34 AM Go to last post
  4. a question with 3 different probablities

    a baseball problem player A has a batting average of .350, player B as a BA of .184 and player C has a BA of .381. Making no adjustments for the...

    Started by buddyreno‎, 08-20-2011 12:49 PM
    • Replies: 3
    • Views: 1,757
    08-20-2011, 04:21 PM Go to last post
  5. Matching problem

    I have bumped into some matching-type problems that seem to require some coding, unless someone can point out existing formulas or appropriate...

    Started by FaustoMorales‎, 08-17-2011 01:49 AM
    • Replies: 1
    • Views: 1,302
    08-17-2011, 02:55 PM Go to last post
  6. birthday coincidence

    Hi, I'm wondering if anyone can help with something that's been puzzling my family for years. I have 3 sons, 2 from my first marriage and one from...

    Started by AngieT‎, 08-15-2011 10:34 AM
    • Replies: 10
    • Views: 2,747
    08-17-2011, 02:24 PM Go to last post
  7. Probability - Expectation of multiple exponentials

    Hi everybody, Your forum has been helpfull for some problems that I had in the past (they were already asked here), but now I have a question that...

    Started by BEX‎, 08-14-2011 02:41 PM
    • Replies: 5
    • Views: 3,649
    08-16-2011, 03:22 PM Go to last post
  8. Simple Homework Problem: Urgent.

    Hi, Here are a couple questions: I've attempted some answers, which you see below. Please can you check me and help! a) We want P(D1)....

    Started by Peytonator‎, 08-16-2011 11:56 AM
    • Replies: 7
    • Views: 2,273
    08-16-2011, 03:16 PM Go to last post
  9. expected value

    If y = -ax^2 + bx -c , what will be E( y ) and Var( y ) ?

    Started by sandip2k1in‎, 08-16-2011 01:13 PM
    • Replies: 0
    • Views: 2,317
    08-16-2011, 01:13 PM Go to last post
  10. Markov chain transition probability matrix

    Hi there, I'm trying to understand markov chains and transition probability matrices. I have a recording of time (1, 2,, 3 second etc), velocity...

    Started by bradyj2‎, 08-16-2011 10:19 AM
    • Replies: 1
    • Views: 3,019
    08-16-2011, 12:00 PM Go to last post
  11. 90 Ball Bingo

    In the traditional game of bingo there are 90 balls and each player gets a card with 15 of those 90 balls on arrange in 3 lines of 5. To match any...

    Started by mwm103‎, 08-15-2011 09:54 AM
    • Replies: 0
    • Views: 2,846
    08-15-2011, 09:54 AM Go to last post
  12. Homework Problem- Normal Distribution/Standard Deviation

    Hi there, I've been working through my homework problems and this one has totally stumped me in terms of where to start in order to complete the...

    Started by KarolynBA‎, 08-12-2011 04:54 PM
    • Replies: 6
    • Views: 5,839
    08-14-2011, 07:40 AM Go to last post
  13. Probability Problem

    Hi Everyone, I am wondering if I have the 5th, 25th, 50th, 75th, and 95th percentile values of 200 observations without knowing the standard...

    Started by victoryjia‎, 08-11-2011 09:50 PM
    • Replies: 2
    • Views: 2,228
    08-12-2011, 08:19 AM Go to last post
  14. no. of bombs required to destroy : question

    please give me a clue for the following question.. There is 50% chance that any bomb may hit the target. Two direct hits are required to destroy...

    Started by electroboy‎, 08-09-2011 07:57 AM
    • Replies: 2
    • Views: 2,957
    08-09-2011, 10:02 AM Go to last post
  15. Markov Chain

    A Markov chain X_{n},n\geq 0 with states 0, 1, 2 has the transition probability matrix If P(X_{0}=0)=P(X_{0}=1)=\frac{1}{4}, find E How do...

    Started by downthesun01‎, 08-08-2011 03:10 AM
    • Replies: 5
    • Views: 3,865
    08-09-2011, 12:58 AM Go to last post
  16. Kind of unusual problem...

    So this may seem sort of silly but was hoping I could get some help. I am not a very mathematical person but it has interested me a lot recently so...

    Started by AcrylicAce‎, 08-08-2011 12:40 PM
    • Replies: 4
    • Views: 1,847
    08-08-2011, 05:51 PM Go to last post
  17. Question

    I'm working on a queueing problem and I have some kind of problem in calculating a probability distribution function. Suppose that we have three...

    Started by kamkam‎, 08-08-2011 05:22 PM
    • Replies: 0
    • Views: 1,642
    08-08-2011, 05:22 PM Go to last post
  18. Conditional probability calculation

    Please can someone help me with the following question: An urn contains 3 white, 6 red and 5 black balls. Six of these balls are randomly selected...

    Started by Angela_o‎, 07-29-2011 02:55 AM
    • Replies: 1
    • Views: 7,454
    08-08-2011, 11:16 AM Go to last post
  19. Markov Chain Question

    Let P be the transition probability matrix of a Markov chain. Argue that if for some positive integer r, P^r has all positive entries, then so does...

    Started by downthesun01‎, 08-08-2011 05:00 AM
    • Replies: 2
    • Views: 6,304
    08-08-2011, 05:25 AM Go to last post
  20. Conditional Expectation problem

    Consider n multinomial trials, where each trial independently results in outcome i with probability p_i,\sum_{i=1}^{k}p_{i}=1. With X_i equal to the...

    Started by downthesun01‎, 08-04-2011 03:53 AM
    • Replies: 2
    • Views: 3,406
    08-08-2011, 03:09 AM Go to last post
  21. Estimating a distribution

    Hi, Suppose I had some bags containing a large number of black and white marbles. Each bag has a uniform distribution, but I don't know in advance...

    Started by dryguy‎, 12-07-2006 12:46 PM
    • Replies: 12
    • Views: 5,030
    08-08-2011, 02:36 AM Go to last post
  22. trading system problem

    if you have a trading system that is right 80% of the time and the risk/reward is 0.8/1 what is the probability of getting to breakeven in 50 trades?...

    Started by chris2006‎, 08-07-2011 03:55 PM
    • Replies: 0
    • Views: 1,519
    08-07-2011, 03:55 PM Go to last post
  23. A large and powerful corporation is extorting money from the public.

    When confronted with ****ing evidence the corporate CEO says these were rogue employees, these were anomalous cases, etc., etc., etc.. . . . ...

    Started by Outlier‎, 08-06-2011 04:00 PM
    • Replies: 5
    • Views: 2,433
    08-07-2011, 09:47 AM Go to last post
  24. Question Estimating Conversion Rate When Data is Sparse

    I'm a co-founder of a startup, and am seeking help with a statistical problem. I've been wracking my brains over this, and wondered if any of you...

    Started by chris.b‎, 08-06-2011 08:10 PM
    • Replies: 0
    • Views: 1,976
    08-06-2011, 08:10 PM Go to last post
  25. Learning Probability Math

    I’m reading a couple of works on probability, including “Probability Theory: The Logic of Science” by Jaynes. All of the math is over my head, and I...

    Started by StevenCraigMiller‎, 08-04-2011 08:31 PM
    • Replies: 6
    • Views: 2,804
    08-05-2011, 01:09 PM Go to last post
  26. permutation and combination

    In how many ways 5 married couples are seated on Line, provided no person is next to his/her partner

    Started by juantheron‎, 07-29-2011 09:50 PM
    • Replies: 1
    • Views: 2,023
    08-01-2011, 06:32 PM Go to last post
  27. Basic question about the normal distribution

    So it seems like different distributions have different kinds of "experiments" associated with them, like how you use the binomial distribution when...

    Started by Indecisive‎, 07-27-2011 09:26 AM
    • Replies: 3
    • Views: 2,154
    07-31-2011, 02:31 AM Go to last post
  28. 2012 Presidential Election Probability Calculator

    I'm trying to create a calculator to determine odds of Democrats winning the 2012 US Presidential election. I take the electoral college map from...

    Started by tjc23‎, 07-30-2011 09:44 AM
    • Replies: 2
    • Views: 4,226
    07-31-2011, 02:25 AM Go to last post
  29. characterization of multivariate normal distribution by covariances

    Hi, the professor told us that a multivariate normal distribution can be characterized as the only distribution for which zero covariance implies...

    Started by advmc‎, 07-30-2011 03:34 AM
    multivariate normal
    • Replies: 3
    • Views: 3,619
    07-30-2011, 06:50 AM Go to last post
  30. Question regarding Type II error probability

    A researcher believes, on the basis of new data, that the height of a woman 20 years or older is greater than the published mean height of 62.9...

    Started by dsterlingwells‎, 07-29-2011 08:37 PM
    • Replies: 1
    • Views: 3,166
    07-30-2011, 06:16 AM Go to last post
  31. six digit no.

    a no. of six digit is written down at random. the probability that the sum of the digit of the no. is even is

    Started by juantheron‎, 07-26-2011 11:09 PM
    • Replies: 8
    • Views: 3,228
    07-30-2011, 03:15 AM Go to last post
  32. An application of optional sampling theorem to 1-D random walk

    Hello all, I have a question about what wiki has to say about an application of optional sampling theorem to symmetric random walk: * Now...

    Started by lu22‎, 07-29-2011 02:34 PM
    • Replies: 2
    • Views: 3,402
    07-29-2011, 07:18 PM Go to last post
  33. how to determine there are less than 10% brown M&Ms

    I am not sure where this question goes but I think this is the closest match. Say I have a big box of M&Ms and 20% of them are brown M&Ms. I break...

    Started by Parker‎, 07-28-2011 11:58 PM
    • Replies: 1
    • Views: 1,944
    07-29-2011, 10:31 AM Go to last post
  34. http://en.wikipedia.org/wiki/27_Club

    There does seem to be a causal relationship between occupation and death, but why at 27? Does it mean anything?

    Started by Outlier‎, 07-23-2011 05:48 PM
    • Replies: 11
    • Views: 11,921
    07-29-2011, 09:20 AM Go to last post
  35. Probability Problem

    Apologies if my terminology is bad, I haven't done any statistics for years. If this thread is posted in the wrong place, sorry I am new to this...

    Started by adz‎, 07-28-2011 10:40 AM
    • Replies: 7
    • Views: 2,480
    07-28-2011, 11:46 PM Go to last post
  36. Chance of winning - question

    Hi, I have not figured out how to solve the following questions: 1. Report the chance that Bears wins at least 6 games this year. 2. Compute...

    Started by Alexander1981‎, 07-26-2011 04:09 PM
    • Replies: 2
    • Views: 1,719
    07-28-2011, 02:34 PM Go to last post
  37. Correlation of the product of 2 multivariate normal variables...

    hello everyone! i've got a quick theoretical question that i'm gearing towards a simulation exercise but i need to get my stuff right first... ...

    Started by spunky‎, 07-25-2011 11:16 PM
    • Replies: 12
    • Views: 5,977
    07-28-2011, 01:33 AM Go to last post
  38. Card Game Probability Question!

    The game is screw your neighbor! Four card players at a table. Two players have 1 chip two players have 2 chips. The player who gets delt the low...

    Started by chad‎, 07-27-2011 02:25 PM
    • Replies: 1
    • Views: 1,730
    07-27-2011, 05:35 PM Go to last post
  39. Find expectation using conditioning

    A coin, having probability p of coming up heads is successively flipped until at least one head and one tail have been flipped. (a)Find the expected...

    Started by downthesun01‎, 07-27-2011 04:03 AM
    • Replies: 2
    • Views: 2,355
    07-27-2011, 04:32 AM Go to last post
  40. Simple Question

    Hi all, I got stuck with a simple question. Thanks in advance for your response. The question is: X_i 's follow i.i.d standard normal rvs. ...

    Started by vinux‎, 07-25-2011 08:22 AM
    • Replies: 11
    • Views: 2,895
    07-26-2011, 11:36 AM Go to last post
  41. Recurring Event, Probability of Totals

    Hi. I'm actually not working on homework, but trying to make odds tables for a card game called Summoner Wars to practice/learn math for fun. ...

    Started by joepinion‎, 07-25-2011 05:39 PM
    binomial distribution, games, odds, percentage, recursion
    • Replies: 1
    • Views: 5,171
    07-25-2011, 11:53 PM Go to last post
  42. Smile My answers to a revision paper

    Hi, I was wondering if I could get some of these answers checked for me. The paper I am working from is here and I am attempting section A...

    Started by TheNCO‎, 07-22-2011 10:14 AM
    • Replies: 4
    • Views: 3,680
    07-25-2011, 11:25 AM Go to last post
  43. Sampling distribution of the proportion

    I have a fairly simple question about a specific step within this problem. "The probability is 90% that the sample percentage is contained within...

    Started by TheDev‎, 07-23-2011 07:45 PM
    • Replies: 2
    • Views: 5,601
    07-23-2011, 08:02 PM Go to last post
  44. Probability Question

    Health public researcher checked data from a group of 937 men that died in 2009. The researcher found that 210 of the men died from heart related...

    Started by Yankel‎, 07-18-2011 11:47 AM
    • Replies: 4
    • Views: 2,582
    07-22-2011, 02:39 PM Go to last post
  45. Combining multiple probabilities

    Hi, Is it possible to add two or more probabilities together to get an overall probability? For example: There is a dichotomous outcome, let's...

    Started by lmsava‎, 07-21-2011 05:43 AM
    • Replies: 1
    • Views: 2,559
    07-21-2011, 06:43 AM Go to last post
  46. Exclamation Proof question

    Using the identity: (^θ -θ) = + = + B(^θ) , Show that

    Started by sigma.g19‎, 07-20-2011 05:15 PM
    • Replies: 1
    • Views: 4,160
    07-20-2011, 05:39 PM Go to last post
  47. normal distribution, use 50% probablity to get standard deviation

    Hello, I have got a normal distribution with μ=0 and I know that 50% of all observations are within a certain range. How can I get the standard...

    Started by JRadinger‎, 07-18-2011 03:45 AM
    • Replies: 2
    • Views: 6,070
    07-19-2011, 11:56 AM Go to last post
  48. Basic probability

    Whilst I've done pg stats (like 30+ years ago) and still use them a bit, I'm now wishing to look more closely at the basis of probability. With that...

    Started by Zarathrustra‎, 07-18-2011 11:48 AM
    • Replies: 0
    • Views: 2,393
    07-18-2011, 11:48 AM Go to last post
  49. Suppose there's two events, A & B, with P(A)=75% and P(B)=66%. Select all that apply

    Hello, I'm having a lot of trouble with this homework question and I really need help figuring it out! Suppose there are threeevents, A, B, and C,...

    Started by flyingcars‎, 07-17-2011 09:55 PM
    homework help, multiplication rule, probability question
    • Replies: 1
    • Views: 3,398
    07-17-2011, 10:09 PM Go to last post
  50. expected gain

    Let's say the price people are willing to pay for something is listed below, so 9 people are willing to pay 3 while only 1 is willing to pay 12. How...

    Started by Outlier‎, 07-16-2011 03:03 PM
    • Replies: 6
    • Views: 4,253
    07-17-2011, 11:28 AM Go to last post
  51. brownian motion in stopping time

    Hello everyone! I am stuck with a little problem concerning BM and stopping time. :( If we define tau_n:=inf{t>=0 : |W_t|>=n}, does anyone have...

    Started by Marina‎, 07-13-2011 07:08 AM
    • Replies: 6
    • Views: 3,741
    07-15-2011, 12:41 PM Go to last post
  52. Throwing a die 7 times

    Hello, my problem is as follows: Throw a die 7 times. i) What is the probability that you get number 6 twice and all other numbers...

    Started by binjip‎, 07-09-2011 01:25 PM
    die, permutation
    • Replies: 4
    • Views: 2,638
    07-10-2011, 06:19 AM Go to last post
  53. Thumbs up Covariance of random balls

    Hi, would appreciate any comments: I have: 10 balls with number 6 on each, 10 balls with n. 7, 10 balls with n. 8. So it's 30 balls in...

    Started by binjip‎, 07-09-2011 01:39 PM
    covariance
    • Replies: 2
    • Views: 2,027
    07-09-2011, 06:17 PM Go to last post
  54. exponential distribution: funtional system

    Problem: The system is functional if all 3 of its components are in working condition. If lifetime of each components is distributed...

    Started by jwxie518‎, 07-06-2011 08:07 PM
    • Replies: 4
    • Views: 4,284
    07-09-2011, 12:08 PM Go to last post
  55. Can someone check if I did this right?

    word problem: eight married couples are studying in a room. If four people are chosen at random, find the probability that: a) they are married...

    Started by shell‎, 07-08-2011 07:11 PM
    • Replies: 1
    • Views: 2,249
    07-08-2011, 08:31 PM Go to last post
  56. Need help with understanding the synatx of Chebyshev

    Hi guys HW Problem: Suppose X is a random variable with mean and variance both equal to 20. What can be said about P(0\leq X\leq 40)? ...

    Started by jwxie518‎, 07-08-2011 04:51 PM
    • Replies: 1
    • Views: 2,594
    07-08-2011, 05:37 PM Go to last post
  57. help: Finding number of tosses for an event.

    Hello, I have a problem here which i understand but i am confused how to go about this. This is because our great teachers make us do everything...

    Started by nered‎, 07-07-2011 06:22 PM
    • Replies: 3
    • Views: 1,899
    07-08-2011, 02:07 AM Go to last post
  58. Weird one....

    Kindly help me in this one. What is the probability of a 2 yr storm (a storm occuring once in two years) to occur twice a year. Thanks

    Started by mohm1977‎, 07-07-2011 01:32 AM
    • Replies: 2
    • Views: 1,944
    07-07-2011, 11:51 AM Go to last post
  59. Small problem, calculating probability.

    Ok so this was my problem on my last exam: NOTE that i am not asking you to solve this problem for me look bellow. Oke. I know how to solve...

    Started by nered‎, 07-06-2011 02:19 PM
    • Replies: 9
    • Views: 2,417
    07-07-2011, 11:27 AM Go to last post
  60. Help me solve this probability question

    The owner of a petrol station wished to determine the proportion of customers who use a credit card to pay at the pump. He surveyed 200 customers and...

    Started by boys8goods‎, 07-06-2011 04:13 PM
    • Replies: 2
    • Views: 2,093
    07-06-2011, 04:32 PM Go to last post

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