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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: 30,315
    09-30-2005, 09:44 AM Go to last post
  1. Probability of getting 3 out 5

    I am driving myself up the wall. I am trying to figure out the probability of getting 3 out of 5 questions right. At first my thougt was 1/5 x 1/5 x...

    Started by pjkaraffa‎, 09-11-2009 09:27 AM
    • Replies: 1
    • Views: 7,471
    09-11-2009, 10:48 AM Go to last post
  2. Process capability without variability in data?

    My company uses Cpk to judge process capability, with a 1.33 Cpk being the acceptable minimum for most processes. In some cases, we do not have...

    Started by Dannyboy175‎, 09-09-2009 01:34 PM
    • Replies: 5
    • Views: 7,385
    09-11-2009, 06:41 AM Go to last post
  3. Properties of exponential distributions

    We have only briefly covered exponential distributions in class, and I want to make sure I understand how the memoryless property works. If we...

    Started by Troopers04‎, 09-10-2009 10:55 PM
    • Replies: 0
    • Views: 2,261
    09-10-2009, 10:55 PM Go to last post
  4. Confused on total probability formula

    I am very confused on how to apply the total probability formula. If X and Y are two independent continuous random variables with pdfs g(x) and...

    Started by Troopers04‎, 09-10-2009 09:19 AM
    • Replies: 2
    • Views: 4,584
    09-10-2009, 12:08 PM Go to last post
  5. HR or OR or RRR ?

    Hi what's th différence between: "hazard ratio", "odds ratio" AND "Relative risk ratio" ??? Regards

    Started by viwel‎, 09-10-2009 08:00 AM
    • Replies: 0
    • Views: 4,011
    09-10-2009, 08:00 AM Go to last post
  6. STAT101 Simple-ish Probability

    The mean monthly fee for Internet service is $25, Standard Deviation is $12. If a sample of 33 households is taken, what is the probability that a...

    Started by aenyiema‎, 09-09-2009 11:18 AM
    • Replies: 2
    • Views: 2,368
    09-09-2009, 05:01 PM Go to last post
  7. Help! Probability question.

    I'm currently doing a practice assignment and I've been fine with the first 2 sections, but this 3rd part is just killing me, it's making no sense to...

    Started by slickerthansleek‎, 09-08-2009 05:18 AM
    • Replies: 2
    • Views: 3,469
    09-09-2009, 04:13 AM Go to last post
  8. Maximum likelihood estimate

    Q. let X1, X2,...,Xn be obeservations from the uniform pdf fx(x;Q) = 1/Q, 0<x<Q. Find the maximum likelihood estimate of Q. (Q is theta) ...

    Started by Horto‎, 09-08-2009 09:47 PM
    • Replies: 1
    • Views: 2,343
    09-08-2009, 09:57 PM Go to last post
  9. Marginal pdf

    let X and Y be random variable with joint pdf fxy(x,y) = (2/5)*(3x+2y) 0<x<1, 0<y<1. b) calculate the marginal distributions for this i did...

    Started by Horto‎, 09-02-2009 08:06 PM
    • Replies: 3
    • Views: 6,922
    09-08-2009, 12:35 PM Go to last post
  10. Question Samples from uniform distributions

    L.S. For an internship I'm stuck with a nasty, statistical problem, so I decided to join this forum and let you guys have a go at it. Evidentily...

    Started by maartmeester‎, 08-17-2009 04:01 AM
    • Replies: 11
    • Views: 3,044
    09-08-2009, 12:14 PM Go to last post
  11. Probability

    A stack of cards contains four Aces, three Kings, two Queens and six other cards. Seven cards are randomly drawn from the stack, without replacement...

    Started by sindu‎, 09-08-2009 06:28 AM
    • Replies: 0
    • Views: 1,804
    09-08-2009, 06:28 AM Go to last post
  12. Help! am stucked calculating marginal likelihood

    Please could any one help me, i want to calculate the marginal likelihood, which depends on the prior distribution over p using any other prior...

    Started by dode‎, 09-07-2009 05:29 AM
    • Replies: 0
    • Views: 1,737
    09-07-2009, 05:29 AM Go to last post
  13. Statistics Question (Normal Distribution)

    Hello, I have taken a statistics class and I am confused with one of the problem that was put forth. The question asks for the probability...

    Started by julia877‎, 09-06-2009 07:42 PM
    • Replies: 0
    • Views: 2,003
    09-06-2009, 07:42 PM Go to last post
  14. choosing the right distribution

    I am in a queueing networks class. From what I have read so far, the distributions of the arrival patterns and service patterns need to be...

    Started by nurban‎, 09-04-2009 06:51 PM
    • Replies: 0
    • Views: 2,889
    09-04-2009, 06:51 PM Go to last post
  15. Creating a joint probability table

    I need help figuring out how to create this joint probability table 43 million people in the United States go without health insurance. Sample...

    Started by elementarystat‎, 09-03-2009 02:17 PM
    • Replies: 3
    • Views: 19,055
    09-03-2009, 09:58 PM Go to last post
  16. Question Stats question: random balls

    There is a pool of 4500 unique balls. There are 3 people, called X, Y and Z, who are blindfolded. They take turns to take out as many balls as they...

    Started by Combo9‎, 08-02-2009 11:34 AM
    • Replies: 3
    • Views: 3,596
    09-03-2009, 07:22 PM Go to last post
  17. Question on standard unit problem

    Mutual Fund A has an average return of $25,000 and Mutual Fund B has an average return of $5,000. The standard deviation for Fund A is $10,000 and...

    Started by rossini‎, 09-03-2009 12:23 AM
    • Replies: 8
    • Views: 4,240
    09-03-2009, 11:56 AM Go to last post
  18. Help with a simple problem - total probabilities

    I don't quite understand question 2. What is it asking for, and what does it mean? A highway commission conducted a survey to learn about the...

    Started by elementarystat‎, 08-31-2009 10:44 AM
    • Replies: 3
    • Views: 2,527
    08-31-2009, 11:43 PM Go to last post
  19. Football game!

    A team plays 3 football games. If it wins it get 3 points, if it´s even it gets 1 point and if it loses it gets nothing. What are the changes for...

    Started by statisticgirl‎, 08-30-2009 03:04 PM
    • Replies: 3
    • Views: 2,965
    08-31-2009, 12:47 PM Go to last post
  20. Statistics and signal processing

    Please, help me to understand with logic of mathematical calculations resulted in work pubs.drdc.gc.ca/PDFS/unc06/p518839.pdf. First of all to me the...

    Started by alex65111‎, 08-30-2009 02:18 PM
    • Replies: 0
    • Views: 1,897
    08-30-2009, 02:18 PM Go to last post
  21. Stochastic Process Chapter Review Question - AHHHHHHH!

    Please see the attached image for the question. Thanks.

    Started by woody198403‎, 08-30-2009 07:10 AM
    • Replies: 1
    • Views: 2,218
    08-30-2009, 01:19 PM Go to last post
  22. Method of moments

    what are the advantages of using the method of moments instead of the maximum likelyhood for estimating the parameters? In my case I hade to find...

    Started by aledanda‎, 08-27-2009 07:27 AM
    • Replies: 1
    • Views: 2,699
    08-27-2009, 08:52 AM Go to last post
  23. analyzing the PDF or the CDF ??

    Hi, I'm recently grappling with the following problem: For my thesis i had to fit my data with two theoretical distribution (gamma and...

    Started by aledanda‎, 08-27-2009 07:22 AM
    • Replies: 0
    • Views: 2,360
    08-27-2009, 07:22 AM Go to last post
  24. Stuck again. Please advice.

    Question: A coffee company distributes boxes of coffee with a mixture of dark, light and roast. Suppose that the weight of each box is 1 kilogram,...

    Started by canon14‎, 08-25-2009 09:36 PM
    • Replies: 5
    • Views: 2,018
    08-27-2009, 06:59 AM Go to last post
  25. P(Mn<=x) = F^n(x)

    P(Mn<=x) = F^n(x) where Mn = max(X1,...,Xn) Why is this true?

    Started by kfcnhl‎, 08-26-2009 04:00 PM
    • Replies: 1
    • Views: 1,906
    08-26-2009, 04:26 PM Go to last post
  26. Probability that one group of successes will be greater than another

    So, I'm working on this big old nerdy project, but I haven't got much of a head for statistics. I was wondering if someone would be able to help me....

    Started by heavyarms553‎, 06-12-2009 09:48 PM
    • Replies: 5
    • Views: 4,731
    08-26-2009, 11:34 AM Go to last post
  27. Probability of no fish

    Let Xt be the number of fish that a particular fishing boat catches on trip t. Suppose that the number of fish caught is independent from trip to...

    Started by gambs‎, 08-25-2009 12:52 PM
    • Replies: 1
    • Views: 2,014
    08-26-2009, 03:32 AM Go to last post
  28. Quirky wording?

    Working on a problem and the wording is not very clear: The amount in a bottle is normally distributed with a mean of 11.7 ounces, and a...

    Started by grace4lun‎, 08-25-2009 07:19 PM
    • Replies: 1
    • Views: 2,667
    08-26-2009, 03:10 AM Go to last post
  29. game show probability question

    Hello, I'm new to probability and taking an introduction to probability course. Here is a simple game show question I'm having trouble with. ...

    Started by pr24916‎, 08-25-2009 01:19 PM
    • Replies: 2
    • Views: 3,330
    08-25-2009, 03:01 PM Go to last post
  30. Cool Need Solution Verified!

    Question: The income of junior executives in a large corporation are normally distributed with a standard deviation of $2000. A cutback is pending,...

    Started by canon14‎, 08-25-2009 06:38 AM
    • Replies: 4
    • Views: 2,791
    08-25-2009, 01:38 PM Go to last post
  31. Cool normal distribution help

    Hi everyone, The question is: The time at which the pizza gets delivered follows a normal distribution with a mean of 3:00PM and a standard...

    Started by canon14‎, 08-24-2009 07:15 PM
    • Replies: 6
    • Views: 2,113
    08-25-2009, 06:42 AM Go to last post
  32. Easy question regarding percentages

    I am currently working on a website project and am wishing I had paid more attention in my statistics class from a few semesters ago. Lets say...

    Started by ChEeZeBaLL‎, 08-23-2009 02:50 AM
    • Replies: 3
    • Views: 1,806
    08-25-2009, 02:05 AM Go to last post
  33. Poisson Random Variable

    If A is typing a book the number of errors is a Poisson random variable with mean 2.6 If B is typing a book the number of errors is a Poisson random...

    Started by ivan‎, 08-23-2009 04:36 PM
    • Replies: 1
    • Views: 3,005
    08-23-2009, 05:15 PM Go to last post
  34. Selections from a group with matching top pick

    A person makes 6 selections from a pool of 32, 1 through 32. Six balls are drawn from a pool of 32 without replacement. The probability of...

    Started by robozak‎, 08-23-2009 04:51 PM
    • Replies: 0
    • Views: 2,237
    08-23-2009, 04:51 PM Go to last post
  35. Please, help with conditional probability

    You play with 2 opponents with whom you alternately play with probability p_A and p_B. p_B >= p_A. We want to minimize the number of games you...

    Started by bamby‎, 08-23-2009 04:23 PM
    • Replies: 0
    • Views: 2,657
    08-23-2009, 04:23 PM Go to last post
  36. MGF of random sum

    Let X1, X2,.....~N(0,1) be an iid sequence and let N ~ Poi(lambda) independently. Find the MGF of the random sum S = sum_{k=1}^N (Xk. What I...

    Started by maccaman‎, 08-22-2009 08:09 PM
    • Replies: 0
    • Views: 2,357
    08-22-2009, 08:09 PM Go to last post
  37. Lottery draw question (hypothetical)

    I'm new to the forum, and certainly no math wizz, but I'm hoping someone can help me with a hypothetical lottery problem. Basic setup: there are...

    Started by Mayk‎, 08-20-2009 07:56 AM
    • Replies: 1
    • Views: 3,108
    08-21-2009, 05:01 AM Go to last post
  38. Lost with problem.

    How can I prove that if X1, X2 are independent random variables, and Xn ~ U(0,1) and Mn = max(X1,X2,...Xn), then as n approaches infinity, n(1-Mn)...

    Started by maccaman‎, 08-18-2009 07:17 AM
    • Replies: 1
    • Views: 2,458
    08-18-2009, 07:37 AM Go to last post
  39. Prob of Real Roots

    Hi TalkStats, This is my first post. If someone could help me solve this problem I would be very grateful. Question: A,B,C are independent...

    Started by maccaman‎, 08-16-2009 04:09 AM
    • Replies: 3
    • Views: 6,385
    08-17-2009, 12:01 PM Go to last post
  40. PDF & Cost

    Hi everyone, I just need my answer verified. Suppose that the number of word processors x that are purchased each year has the following...

    Started by ankitj‎, 08-10-2009 12:38 PM
    • Replies: 2
    • Views: 3,108
    08-17-2009, 10:18 AM Go to last post
  41. Another one!

    I think this is correct. I would appreciate any input. Question: The potential buyer of a particular engine requires that the engine start...

    Started by ankitj‎, 08-12-2009 01:38 PM
    • Replies: 2
    • Views: 3,050
    08-17-2009, 10:17 AM Go to last post
  42. Distribution and Laplace Transform

    Consider a game in which a fair coin is tossed indefinitely. Every time heads appears you move 1 metre to the right, and if tails you stay where you...

    Started by woody198403‎, 08-15-2009 09:18 PM
    • Replies: 5
    • Views: 7,300
    08-16-2009, 05:43 AM Go to last post
  43. Proof of Cheybshev Inequality

    Cheybshev's inequality states that if X is a random variable that has finite variance ((sigma^2)) and expectation (mu) then P(|X - (mu)| >=...

    Started by woody198403‎, 08-15-2009 10:03 PM
    • Replies: 5
    • Views: 2,593
    08-16-2009, 05:29 AM Go to last post
  44. PDF and CDF

    The portion of people who responded to a certain mail order solicitation is a continuous random variable X that has the density function: ...

    Started by psu2007‎, 08-14-2009 12:52 PM
    • Replies: 1
    • Views: 2,904
    08-14-2009, 01:15 PM Go to last post
  45. Roulette Repeat

    having a discussion with a colleague who is trying convince me he has a winning strategy at roulette... lol what is an equation to determine the...

    Started by psunder‎, 08-13-2009 08:48 AM
    • Replies: 0
    • Views: 3,298
    08-13-2009, 08:48 AM Go to last post
  46. Hopelessly stuck! Please help!

    An electronic switching device occasionally malfunctions and may need to be replaced. It is known that the device is satisfactory if it makes, on...

    Started by ankitj‎, 08-11-2009 06:23 PM
    • Replies: 10
    • Views: 3,974
    08-12-2009, 10:03 AM Go to last post
  47. Not sure if I did this right! Please help!

    An oil drilling company ventures into various locations, and their success or failure is independent from one location to another. Suppose that the...

    Started by ankitj‎, 08-11-2009 12:19 PM
    • Replies: 6
    • Views: 4,095
    08-12-2009, 07:44 AM Go to last post
  48. Poisson Question! Please help!

    So the question is: A restaurant chef prepares a tossed salad containing, on average, 5 vegetables per day. Find the probability that the salad...

    Started by ankitj‎, 08-11-2009 09:19 AM
    • Replies: 3
    • Views: 5,255
    08-11-2009, 12:06 PM Go to last post
  49. Calculate Probabilty of event

    Hi !!! I have a prooblem and it seems the solution is simple but I need somebody else opinion. I have k groups of numbers from 1 to n . ...

    Started by snassimr‎, 08-11-2009 12:04 PM
    • Replies: 0
    • Views: 1,579
    08-11-2009, 12:04 PM Go to last post
  50. prob of at least 2/phone number problem

    Here's an interesting problem I came upon A person wrote a phone number on a note and that was later lost. When he try to recollect, he can...

    Started by dknight237‎, 07-28-2009 08:54 PM
    • Replies: 7
    • Views: 4,039
    08-11-2009, 08:42 AM Go to last post
  51. PDF & CDF Integration! Please help!!

    Hi everyone, I haven't done integration in a long time, so I just need someone to verify if my calculation is right. The question is: ...

    Started by ankitj‎, 08-10-2009 06:52 AM
    • Replies: 2
    • Views: 4,557
    08-10-2009, 09:31 AM Go to last post
  52. GARCH(t, GED), VaR

    Hey I stumbled over a problem for which I can’t find a solution, hopefully anybody can help me. downer I calculate the volatility from two...

    Started by riddy‎, 08-08-2009 04:11 PM
    • Replies: 0
    • Views: 4,015
    08-08-2009, 04:11 PM Go to last post
  53. Do You Know The Mathematical Formula Of This Spreadsheet?

    Hi, I simply want to know the mathematical formula of this spreadsheet: That you can see by clicking there: ...

    Started by Pactole‎, 08-08-2009 03:20 PM
    • Replies: 0
    • Views: 2,987
    08-08-2009, 03:20 PM Go to last post
  54. Real World Problem--Defending Your Gambling Losses

    I'm a slot player, bet the maximum on dollar machines ($40 is a typical bet). Over the period of a year I've had large wins of say, $4000, $14,000,...

    Started by birkoff‎, 08-07-2009 12:15 AM
    • Replies: 0
    • Views: 2,421
    08-07-2009, 12:15 AM Go to last post
  55. F07p1

    here is another problem I tried to do. Please check if you have a moment and provide any necessary feedback. Thank you.

    Started by gambs‎, 08-05-2009 01:38 PM
    • Replies: 2
    • Views: 1,793
    08-06-2009, 08:07 AM Go to last post
  56. W07p5

    I tried this practice problem and seemed to be on the right track but then couldn;t quite get the final result I wanted. If anyone has a chance to...

    Started by gambs‎, 08-05-2009 03:35 PM
    • Replies: 0
    • Views: 1,620
    08-05-2009, 03:35 PM Go to last post
  57. W07p2

    I think I got this one but I want to be extra sure Suppose we have three cards. The first one is blank on both sides, the second has an X on one...

    Started by gambs‎, 08-05-2009 02:34 PM
    • Replies: 0
    • Views: 1,484
    08-05-2009, 02:34 PM Go to last post
  58. F07P2e

    Another check of my work. Thank you!

    Started by gambs‎, 08-05-2009 01:46 PM
    • Replies: 0
    • Views: 1,556
    08-05-2009, 01:46 PM Go to last post
  59. Clt

    This seems like it should be easy but for some reason, I'm not seeing it. Suppose we pick at random and independently 100 numbers in the interval ...

    Started by gambs‎, 08-04-2009 02:45 PM
    • Replies: 0
    • Views: 1,711
    08-04-2009, 02:45 PM Go to last post
  60. uniform pdf

    Suppose X~U(0,1). Note that f(x) = 1 when 0 < x < 1 and 0 otherwise. a. What is the probability that √X is less than 1/2? for this I...

    Started by gambs‎, 08-03-2009 12:51 PM
    • Replies: 2
    • Views: 3,020
    08-04-2009, 02:29 PM Go to last post

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