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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: 30,366
    09-30-2005, 09:44 AM Go to last post
  1. Probability distribution (NEED HELP BIG TIME)

    ========================================================= *PLEASE DON'T simply write the answer, I NEED STEP BY STEP, on how to do it...

    Started by uni-student‎, 04-10-2008 08:03 PM
    • Replies: 5
    • Views: 2,331
    04-11-2008, 09:15 AM Go to last post
  2. Liberal Arts Major looking for help - instant win game probability

    Problem to solve regarding an instant win game. 35 million game pieces are circulated via the mail. Randomly, 1,000 winning game pieces of $5,000...

    Started by gobucks888‎, 04-11-2008 08:44 PM
    • Replies: 0
    • Views: 2,140
    04-11-2008, 08:44 PM Go to last post
  3. Unhappy poisson question

    I have great trouble translating word problems into a formula- I am particularly dyslexic with numbers. I have a problem that I have worked on for...

    Started by lkasse‎, 04-12-2008 09:27 AM
    • Replies: 0
    • Views: 2,497
    04-12-2008, 09:27 AM Go to last post
  4. 3D Random Walk

    Okay, so I've got this random walk problem here: (a) Using an appropriate Dirac-delta function, find the probability density w(s) for...

    Started by Callmesomething‎, 04-11-2008 07:54 PM
    • Replies: 1
    • Views: 4,631
    04-12-2008, 11:32 PM Go to last post
  5. Probability Help!

    Its is known that different diseases can produce the same symtoms. We know that a particular sets of symptoms, which we will call H, can occur with...

    Started by uni-student‎, 04-12-2008 11:06 PM
    • Replies: 1
    • Views: 1,819
    04-12-2008, 11:55 PM Go to last post
  6. Discrete Distributions: Coin Toss

    Let X be the number of flips of a fair coin that are required to observe heads-tails on consecutive flips. a. Find the probability mass function...

    Started by xcowrnx‎, 04-12-2008 02:27 PM
    • Replies: 3
    • Views: 5,338
    04-13-2008, 08:07 PM Go to last post
  7. Comparing 2 choice simulations

    Hello there, I am stumped with a conceptual problem, for which I am sure there is a very simple solution. There are 2 computer models of...

    Started by Marc_J_Buehner‎, 04-12-2008 01:21 AM
    • Replies: 1
    • Views: 2,733
    04-14-2008, 07:03 PM Go to last post
  8. Binomial Distribution

    I just want someone to please verify whether my approach to this problem is correct. The question goes as follows; Use a binomial distribution to...

    Started by Yorick‎, 04-10-2008 02:38 PM
    • Replies: 1
    • Views: 2,343
    04-14-2008, 07:15 PM Go to last post
  9. Help Needed With A Normal Ditribution Problem.

    The test scores for 300 students were entered into computer, analysed and stored in a file. Someone accidentally erased a major portion of this file...

    Started by Stitch‎, 04-08-2008 01:19 PM
    • Replies: 1
    • Views: 2,275
    04-14-2008, 07:23 PM Go to last post
  10. Probability of Word within Word

    Hello! I'm in dire need of help as I've been working on this for a couple days now. I've been to the help center around school and have had three...

    Started by Abbott54‎, 04-16-2008 11:20 AM
    • Replies: 2
    • Views: 4,561
    04-16-2008, 11:04 PM Go to last post
  11. Question Elevator probability question

    This morning, when I walked into the elevator, I had this question in my mind. Five people walk into an elevator at Ground level. There are 17...

    Started by oddsnevens‎, 04-17-2008 02:08 PM
    • Replies: 4
    • Views: 8,027
    04-18-2008, 02:27 PM Go to last post
  12. Confidence intervals?

    Hi my questions is this. Using PHstat or by hand set up a 90% confidence interval estimate of the number of days absent. Sample of 25 people....

    Started by el1‎, 04-16-2008 07:03 PM
    • Replies: 2
    • Views: 3,356
    04-18-2008, 08:39 PM Go to last post
  13. Normal Probability HELP!!!

    i have a question that asks what the probability that sales drop below 15000 per month , and also 18000 per month, mean is 20000 and stddev is 3000....

    Started by el1‎, 04-18-2008 08:42 PM
    • Replies: 0
    • Views: 2,319
    04-18-2008, 08:42 PM Go to last post
  14. frequency distribution of word length

    I want to be clear about the frequency distribution that what is this and what is mean by frequency distribution of word length? Can you please...

    Started by farakhkhan@yahoo.com‎, 04-20-2008 02:46 PM
    • Replies: 0
    • Views: 3,214
    04-20-2008, 02:46 PM Go to last post
  15. Joint density function

    This is from Exercise 5.26 from Mathematical Statistics with Applications v6. f (y1, y2) = {2, 0 <= y1 <= 1, 0 <= y2 <= 1, 0 <= y1 + y2 <= 1 ...

    Started by statsdud‎, 04-22-2008 05:43 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 7,576
    04-22-2008, 05:15 PM Go to last post
  16. Z test

    Hi , i have a question regarding z test and testing at 5% level. If sample size is 60 S=11.7 X=42.8 and i use formula Z= X-mu ...

    Started by el1‎, 04-22-2008 06:11 PM
    • Replies: 3
    • Views: 1,935
    04-22-2008, 07:06 PM Go to last post
  17. Exclamation Prob of happening by chance

    Say I have 1000 balls. 50% are blue, 50% are red. Someone trys to convince me they can pick red balls from the bag without looking at the balls. ...

    Started by Adam‎, 04-08-2008 07:02 PM
    • Replies: 9
    • Views: 4,482
    04-22-2008, 09:16 PM Go to last post
  18. Percentage overlap of two gaussian distributions

    I would like to know how to calculate the overlap between two one dimensional gaussian distributions. Here is my approach: 1) Find the point, x*,...

    Started by tuesday‎, 04-23-2008 07:15 PM
    • Replies: 0
    • Views: 5,964
    04-23-2008, 07:15 PM Go to last post
  19. Need help asap with probability qusetion please

    Mechanico *** produce many different specialist components for industry. One such component that is made are pipe sections used in commercial...

    Started by tim_e‎, 04-23-2008 09:34 PM
    • Replies: 0
    • Views: 2,060
    04-23-2008, 09:34 PM Go to last post
  20. birth defects - probability

    I am new and really stuck with this one: Analyzing cases of a rare congenital defect>>>>>>>>>>>>> 1 female in 30 in the population carries the...

    Started by free‎, 04-22-2008 03:54 AM
    • Replies: 3
    • Views: 5,845
    04-25-2008, 01:26 PM Go to last post
  21. Please help I need the formula to solve this problem

    Help please I am completely lost on this problem could someone help me by explaining what formula to use? Once I have a formula I should be able to...

    Started by Mystika‎, 04-26-2008 03:29 AM
    • Replies: 0
    • Views: 2,298
    04-26-2008, 03:29 AM Go to last post
  22. Exclamation Please help I solved this problem but the answers seem unlikely

    Please look over this problem I have solved it but the answers I have gotten seem unlikely. If they are correct please let me know otherwise please...

    Started by Mystika‎, 04-26-2008 06:24 AM
    • Replies: 0
    • Views: 2,323
    04-26-2008, 06:24 AM Go to last post
  23. Need Extreme Help!!!

    Here is the problem I am having trouble with. A tire company finds the lifespan for one brand of its tires is normally distributed with a mean of...

    Started by ryanl‎, 04-26-2008 12:40 PM
    • Replies: 2
    • Views: 4,534
    04-26-2008, 07:44 PM Go to last post
  24. Probability help

    An investment offers the chances of various returns for each of 3 years as follows- Year Return- $30,000 $40,000 1 ...

    Started by lesgriffith‎, 04-27-2008 05:35 AM
    • Replies: 0
    • Views: 2,435
    04-27-2008, 05:35 AM Go to last post
  25. probability problem.. help?

    I have a question using the uniform probability where c=4 and d=10 Find k where P(2≤X≤k)=0.6 so (k-2)(1/6)=0.6 k-2=1 k=3 correct? TIA!

    Started by baby2k1‎, 04-27-2008 02:28 AM
    • Replies: 1
    • Views: 4,986
    04-27-2008, 10:23 PM Go to last post
  26. Talking URGENT Probability Q

    20% of private dwellings are fully owned by their residents (not under mortgage). In a group of 500 properties find the probability that at least 115...

    Started by Fifi‎, 04-27-2008 05:54 AM
    • Replies: 1
    • Views: 2,244
    04-27-2008, 10:26 PM Go to last post
  27. Quality estimation of one and an entire set of elements

    Suppose that I have a set of 10000 elements to buy/sell; I want to do some quality assurance activity in order to avoid to buy/sell invalid elements....

    Started by Marione‎, 04-28-2008 03:55 AM
    • Replies: 0
    • Views: 2,359
    04-28-2008, 03:55 AM Go to last post
  28. The probability of a rise or fall in blood pressure??

    I have developed a database program that searches for all blood pressure readings that are similar to the readings of any given patient. The program...

    Started by LaurieThompson‎, 04-28-2008 01:49 PM
    • Replies: 1
    • Views: 2,525
    04-28-2008, 03:21 PM Go to last post
  29. Homework Help

    I am not sure where to begin or what to do with the below question. Any help would be ace. Cheers. Suppose that fifty people are to be given a...

    Started by statsdud‎, 04-27-2008 07:28 AM
    • Replies: 6
    • Views: 5,480
    05-01-2008, 10:48 PM Go to last post
  30. Four-Sided Die Question

    Consider the trial on which a 4 is first observed in successive rolls of a four-sided die. Let A be the event that 4 is observed on the first trial....

    Started by xcowrnx‎, 03-12-2008 01:47 PM
    • Replies: 4
    • Views: 5,023
    05-05-2008, 01:12 PM Go to last post
  31. Unconditional distribution of X, a binomial random variable

    disregard..

    Started by Valdemar21‎, 05-05-2008 10:11 PM
    • Replies: 0
    • Views: 3,122
    05-05-2008, 10:11 PM Go to last post
  32. chess probability question

    Hello, This question is taken from Ross' a first course in probability chapter 2. It is question 17. Here it is: If 8 rooks are randomly...

    Started by dmdmdm678‎, 05-04-2008 05:17 PM
    • Replies: 4
    • Views: 8,715
    05-06-2008, 12:28 PM Go to last post
  33. Exclamation Exam Question. Conditional Prob and Dist Functions

    Hi Everyone. I was hoping somebody could help me with this question. I think i have confused myself to a point where I am just lost on it. X...

    Started by woody198403‎, 05-09-2008 02:16 AM
    • Replies: 3
    • Views: 4,189
    05-09-2008, 06:11 PM Go to last post
  34. Question probability proof help

    Hi, I need to prove the following argument , can anyone help? Let A={a1,a2,...am} and B={b1,b2,...bn} are 2 group of random variables. ...

    Started by wu7up‎, 05-07-2008 11:54 AM
    • Replies: 6
    • Views: 2,608
    05-10-2008, 08:27 AM Go to last post
  35. Arrow Probability

    Let A and B be constants such that A < B. Let z be a standard normal random variable. For what values of A does P(A<z<B)approximately equal P(z<B)?...

    Started by encircleme‎, 05-09-2008 11:08 PM
    • Replies: 5
    • Views: 2,527
    05-10-2008, 03:18 PM Go to last post
  36. conditional probability problem

    can anyone give hint? if i apply the usual conditional probability rule what i get, for the 1st one say, is f(sigma_theta^2, sigma^2, mu, theta,...

    Started by dwen‎, 05-13-2008 09:28 PM
    • Replies: 0
    • Views: 2,150
    05-13-2008, 09:28 PM Go to last post
  37. quadtrat counts

    hi, maybe someone can help with the following problem: i counted quadrat of a grid with or without incidents. the grid covered a periphery area...

    Started by gimoya25‎, 05-13-2008 11:09 AM
    • Replies: 4
    • Views: 2,777
    05-14-2008, 03:43 AM Go to last post
  38. Finding Dist. Function in the form Y= aX+b

    Hi There, I havent actually attempted this question yet, but if anybody can provide me with a guide to answering it I'd be really greatful. Let X...

    Started by woody198403‎, 05-09-2008 02:36 AM
    • Replies: 5
    • Views: 8,595
    05-14-2008, 06:33 AM Go to last post
  39. Smile PDF and E(Y)

    Hi All, I'm going through revision questions, and I am stuck on this particular section all with similar questions. If somebody can give me a guide...

    Started by woody198403‎, 05-09-2008 02:40 AM
    • Replies: 8
    • Views: 5,478
    05-14-2008, 07:03 AM Go to last post
  40. Exclamation scrabble probability =]

    if im the first to draw all 7 SCRABBLE tiles what is the probabiltiy ill get an X and J? another question: what is the probabilty ill get...

    Started by blargh‎, 05-14-2008 06:34 PM
    • Replies: 1
    • Views: 4,962
    05-14-2008, 09:05 PM Go to last post
  41. Red face Determining Joint PDFs, and Marginal PDFs

    Hi All, I'm going through revision questions, and I am stuck on this particular section all with similar questions. If somebody can give me a guide...

    Started by woody198403‎, 05-09-2008 02:50 AM
    • Replies: 13
    • Views: 12,908
    05-15-2008, 01:04 AM Go to last post
  42. Probability Problems

    Hello can someone verify if I am correct for these problems? A small package of alphabet soup noodles contain 3 As, 3 Bs and 3 Cs. You...

    Started by BaineHallow‎, 05-14-2008 06:04 PM
    • Replies: 1
    • Views: 2,981
    05-15-2008, 06:57 PM Go to last post
  43. Probability

    Need help with this probability The probability that a student has a Visa card (event V) is .70. The probability that a student has a MasterCard...

    Started by Slick‎, 05-17-2008 01:24 PM
    • Replies: 1
    • Views: 2,501
    05-18-2008, 03:12 PM Go to last post
  44. Poisson Mean

    Hello Everyone, Im not sure if i posted at the right section if not im extending my apologies in advance. Ive been reading this network...

    Started by cincity‎, 05-19-2008 12:24 AM
    • Replies: 0
    • Views: 2,216
    05-19-2008, 12:24 AM Go to last post
  45. probability problem

    A bag contains X quarters and Y dimes. Since quarters are bigger, any given quarter is twice as likely to be picked as any given dime. You pick Z...

    Started by fschmidt‎, 05-16-2008 12:31 AM
    • Replies: 1
    • Views: 2,269
    05-19-2008, 05:03 AM Go to last post
  46. Probability that a number in a group of numbers to be less than the average of group

    Hi, I am new to probability and would like to know how to find the probability that a number in a group of numbers is less than the average of that...

    Started by amanjsingh‎, 05-19-2008 06:05 PM
    • Replies: 2
    • Views: 4,826
    05-19-2008, 07:12 PM Go to last post
  47. probability

    Here is the question: After researching tumours of a particular type, a doctor at Princess Margaret Hospital learns that out of 10,000 such tumours...

    Started by roter789‎, 05-14-2008 12:39 AM
    • Replies: 2
    • Views: 2,566
    05-20-2008, 09:21 PM Go to last post
  48. Joint probabillity density function

    Hi I have posted this question on another site as i am new to this one and did not know how to include a formula (plus this question is unlike my...

    Started by noel_gallagher‎, 05-20-2008 10:19 PM
    • Replies: 2
    • Views: 2,378
    05-21-2008, 04:44 PM Go to last post
  49. discrete random variable and determine its characteristic function

    Let Xn be a discrete random variable that takes the values 1,2, . ...... n with equal probability. Evaluate the probability generating function of Xn...

    Started by noel_gallagher‎, 05-21-2008 04:48 PM
    • Replies: 0
    • Views: 3,642
    05-21-2008, 04:48 PM Go to last post
  50. correlation coefficient

    Let X1 and X2 be independent random variables with EXi =Ui (where U is actually Mu) and Var(Xi) =Sigma^2 where sigma(i)^2 >0 and i=1,2,3..... Let Y1...

    Started by noel_gallagher‎, 05-21-2008 04:59 PM
    • Replies: 1
    • Views: 3,366
    05-21-2008, 05:31 PM Go to last post
  51. E(X) and Var(X) of pgf

    Hi everybody, I have the following question that I have to answer. The pgf of a non-negative, integer-valued random variable X is given by ...

    Started by arguabsysi‎, 05-22-2008 01:18 AM
    • Replies: 1
    • Views: 3,162
    05-22-2008, 05:22 AM Go to last post
  52. Probability Confusion

    A sequence of N independent Bernoulli trials is performed, where N in a non-negative integer-valued random variable, and the probability of success...

    Started by woody198403‎, 05-22-2008 05:54 AM
    • Replies: 1
    • Views: 2,507
    05-22-2008, 12:33 PM Go to last post
  53. Need help getting started on some problems

    I have a worksheet here over my entire semester in stats and some of the problems are from very early in the semester and I can't find a way to even...

    Started by Drew‎, 05-22-2008 12:25 PM
    • Replies: 5
    • Views: 3,897
    05-22-2008, 01:23 PM Go to last post
  54. What is a moment generating function intuitively?

    I don't understand intuitively what's a moment generating function. Can someone explain intuitively what's a moment generating function? Thanks.

    Started by shrek‎, 05-22-2008 02:20 PM
    • Replies: 0
    • Views: 2,926
    05-22-2008, 02:20 PM Go to last post
  55. Unhappy Probability and Moment Generating Functions

    Hello, I am terrible when it comes to probability and moment generating functions. I missed 2 lectures this week and I am now completely lost on...

    Started by arguabsysi‎, 05-22-2008 05:16 AM
    • Replies: 5
    • Views: 3,620
    05-22-2008, 02:43 PM Go to last post
  56. Normal Distribution

    How to find a Mean of a specified area (eg Area right side of the mean of distribution) in the normal distribution? Is there any way to do that?

    Started by pgvetrivel‎, 05-24-2008 05:32 AM
    • Replies: 1
    • Views: 2,334
    05-24-2008, 11:46 AM Go to last post
  57. z-test for a proportion

    Please help... Lets say that I have developed a new method and software prototype that aims to significantly reduce the ambiguity inherent in...

    Started by Steve‎, 05-29-2008 06:59 AM
    • Replies: 1
    • Views: 4,143
    05-29-2008, 07:40 AM Go to last post
  58. unknown statistics

    Hi everyone I'm trying to find out what distribution two statistics have and I was wondering if someone could help me out. :) The first statistic...

    Started by sawyer‎, 05-28-2008 12:34 PM
    • Replies: 4
    • Views: 3,046
    05-29-2008, 06:05 PM Go to last post
  59. Video game equipment

    Hello everyone, My friend has been playing this game called Tabula Rasa, and is trying to make the perfect armor for his character. In order to do...

    Started by chriscj‎, 05-14-2008 03:15 AM
    • Replies: 5
    • Views: 4,655
    05-30-2008, 12:00 AM Go to last post
  60. Probability Question

    I'm having trouble figuring this out. 3 digits are chosen in order from 0, 1, 2 ... 9. What is the probability that first < second < third a)...

    Started by nathan183‎, 05-29-2008 09:25 PM
    • Replies: 6
    • Views: 3,006
    05-30-2008, 11:30 AM Go to last post

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