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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: 30,265
    09-30-2005, 09:44 AM Go to last post
  1. Mutual information of two vectors

    As with another poster on this section, I understand the ideas behind mutual information but am having trouble with finding information necessary for...

    Started by mishery‎, 01-02-2008 09:11 AM
    • Replies: 0
    • Views: 4,120
    01-02-2008, 09:11 AM Go to last post
  2. Proof for Pooling

    Hello all, I have a research question regarding pooling probability data. The application is population genetics. Assume we have a population of...

    Started by Bonhomme‎, 01-02-2008 03:09 PM
    • Replies: 0
    • Views: 2,386
    01-02-2008, 03:09 PM Go to last post
  3. probability generating function

    Hi All, I'm new to the forum. I'm trying to learn a bit of statistics on my own (as a pastime) but I'm stuck with this problem: I have two...

    Started by cristiano‎, 01-05-2008 10:01 AM
    • Replies: 0
    • Views: 3,053
    01-05-2008, 10:01 AM Go to last post
  4. Manipulating resulst - Bernoulli distribution

    Say you are estimating the probabiilty of an event happening, and. you determine there is 30% probability of it occurring. You then run the trial....

    Started by Herodotus‎, 01-05-2008 12:39 PM
    • Replies: 0
    • Views: 2,292
    01-05-2008, 12:39 PM Go to last post
  5. Unhappy moment generating function

    Given a random variable X with a uniform continuous pdf (0 for x < a, 1/(b-a) for a <= x <= b, 0 for x > b) and a dependant variable Y = -lnX, how...

    Started by oldiebutgoodie‎, 01-08-2008 09:10 AM
    • Replies: 0
    • Views: 3,631
    01-08-2008, 09:10 AM Go to last post
  6. Question Means and Variances of Random Variables

    A distribution of grades in a class (where A=4, B=3, etc.) is: x 0 1 2 3 4 p(x) .10 .15 .30 .30 .15 ...

    Started by kathleen‎, 01-10-2008 08:49 PM
    • Replies: 1
    • Views: 3,148
    01-14-2008, 01:12 PM Go to last post
  7. Christmas Present Problem

    May be this is a simple problem for the professionals but its driving me mad. Here is the problem: At Christmas time a group of people at work,...

    Started by elko‎, 01-12-2008 09:03 AM
    • Replies: 10
    • Views: 3,108
    01-17-2008, 02:01 PM Go to last post
  8. Run Rudolph, Run!

    Greetings. I was hoping someone could help with a problem. I design games as a hobby and this one is way beyond my basic understanding of...

    Started by flogger‎, 01-16-2008 03:50 PM
    • Replies: 4
    • Views: 3,078
    01-17-2008, 10:57 PM Go to last post
  9. help with this problem

    someone explain the answer of this question ...i have the answers but i want to know the formulas ... An assembly consists of three mechanical...

    Started by zerofreeze‎, 01-18-2008 02:40 PM
    • Replies: 0
    • Views: 4,571
    01-18-2008, 02:40 PM Go to last post
  10. i need help with normal distribution please

    i can't answer this example...can anyone help me asap please.. The diameter of the dot produced by a printer is normally distributed with a mean...

    Started by zerofreeze‎, 01-18-2008 02:49 AM
    • Replies: 5
    • Views: 6,827
    01-18-2008, 03:59 PM Go to last post
  11. Assesing normality - Amateur question

    Hi everybody, (First of all, excuse my poor english : It's not my native tong). I'm working for myself on a computer programm which will deal...

    Started by OlivierT‎, 11-04-2006 10:34 AM
    • Replies: 4
    • Views: 4,133
    01-21-2008, 11:11 AM Go to last post
  12. Unhappy False negatives and positives

    My head is in a knot with this problem! A lab carries out a test sequence on incoming goods to determine if they contain a trace element X. The...

    Started by oldiebutgoodie‎, 01-21-2008 06:24 PM
    • Replies: 0
    • Views: 2,755
    01-21-2008, 06:24 PM Go to last post
  13. normal approximation to binomial distribution.

    hi everyone. so i have this stupid final project and i'm pretty sure i know how to do it but i just wanted to check my method. the question...

    Started by fade0ut‎, 01-21-2008 06:59 PM
    • Replies: 0
    • Views: 4,794
    01-21-2008, 06:59 PM Go to last post
  14. Standardized Normal Distribution and Exponential Probability Distribution

    I am really stuck on these 2 questions, can some please help me!!!! First question is about Standardized Normal Distribution: P(-1.00<z<1.00) =...

    Started by IAMLOST‎, 01-23-2008 11:32 PM
    • Replies: 0
    • Views: 8,949
    01-23-2008, 11:32 PM Go to last post
  15. Post proof for expectation

    hiii ppl here is a small problem i am stuck at, i have to prove that E(X) = in the limit from 0 to infinity where X is non -ve random...

    Started by machan‎, 01-25-2008 02:34 PM
    • Replies: 0
    • Views: 3,329
    01-25-2008, 02:34 PM Go to last post
  16. condition expectation and variance

    Let X, Y be independent exponential random variables with means 1 and 2 respectively. Let Z = 1, if X < Y Z = 0, otherwise Find E(X|Z) and...

    Started by allrighty128‎, 01-25-2008 11:10 PM
    • Replies: 0
    • Views: 2,652
    01-25-2008, 11:10 PM Go to last post
  17. Arrow I need help

    I've been working on this one problem for a week now and can't seem to figure it out. All of the different solutions I have tried have all come out...

    Started by lildill‎, 01-28-2008 05:21 AM
    • Replies: 0
    • Views: 2,145
    01-28-2008, 05:21 AM Go to last post
  18. Lightbulb Help help null and alternative hypotheses

    Null and Alternative Hypotheses -------------------------------------------------------------------------------- I have researched the site...

    Started by Aingeal34‎, 09-14-2007 08:13 PM
    • Replies: 2
    • Views: 3,109
    01-29-2008, 09:57 PM Go to last post
  19. Old question - can't find answer

    PiggyBank has narrowed its options down to two incentive plans: A. cash back when the consumer makes an online purchase; and B. cash back when the...

    Started by Kellyaj‎, 01-29-2008 10:07 PM
    • Replies: 0
    • Views: 1,938
    01-29-2008, 10:07 PM Go to last post
  20. Expected value: an alternative way to calculate it.

    We all know that the expected value of a random variable y with a Probability Density Function f(y) can be calculate as: EV = Int(0,inf, y*f(y)) ...

    Started by fdelnero‎, 01-29-2008 07:25 PM
    • Replies: 1
    • Views: 2,512
    01-30-2008, 09:05 AM Go to last post
  21. How to calculate optimal number of questions in a question bank

    I am trying to determine the optimal number of questions (X) that should be in the question bank so that 2 students in the exam hall should NOT have...

    Started by sprakash1998‎, 01-30-2008 03:08 PM
    • Replies: 0
    • Views: 3,273
    01-30-2008, 03:08 PM Go to last post
  22. Probability that an exponential variable is greater than poisson.

    I need help with one problem in my class, the text is taken directly from the book: The life T (hours) of the lightbulb in av overhead projector...

    Started by Aekei‎, 01-30-2008 02:23 PM
    • Replies: 1
    • Views: 4,983
    01-30-2008, 03:43 PM Go to last post
  23. SAMPLING DISTRIBUTIONS - I tried to answer the question please check my work!*!*!*!*!

    There was no help, and I don't want to give away my work when nobody offers any help to me.

    Started by IAMLOST‎, 01-31-2008 10:44 PM
    • Replies: 1
    • Views: 2,445
    02-01-2008, 03:58 PM Go to last post
  24. please help

    I am new to statistics and probability; the question that I am on is; On an eight question frue/false quiz, a student guesses each answer....

    Started by stevebro‎, 02-02-2008 05:22 PM
    • Replies: 0
    • Views: 2,407
    02-02-2008, 05:22 PM Go to last post
  25. Exclamation need help with MLE!!

    :confused: 1) Suppose X1, X2, ..., Xn ~ Uniform(0, theta) independently, please find the MLE of theta. I just have no idea how to start this...

    Started by hellostats‎, 02-04-2008 04:49 AM
    • Replies: 1
    • Views: 1,849
    02-04-2008, 05:47 PM Go to last post
  26. beta-binomial for repeated discriminative test

    Hi everybody. I need advice on repeated discriminative test. It is a similarity test, i.e. I am interested in determinig that two items are...

    Started by robcap‎, 02-06-2008 10:59 PM
    • Replies: 0
    • Views: 2,704
    02-06-2008, 10:59 PM Go to last post
  27. log-logistic distribution function

    I need to create a function (in Mathematica) to generate a log-logistic distribution (also called a Fisk distribution). I know the log-logistic...

    Started by a^2‎, 02-07-2008 11:01 AM
    • Replies: 0
    • Views: 5,118
    02-07-2008, 11:01 AM Go to last post
  28. weibull distributed waiting times

    hi everyone, wonder if someone can help me - in the same way that a poisson process has exponentially distributed waiting times, what's the process...

    Started by pep‎, 02-07-2008 11:13 AM
    • Replies: 0
    • Views: 3,062
    02-07-2008, 11:13 AM Go to last post
  29. Question Probablility of Drawing a Hunting Permit After x Years? Please Help...

    My friend asked me for his help and I'm stumped. Please help me find the right equation. Here's the problem: If I have a 3&#37; chance of drawing a...

    Started by NumberCruncher‎, 02-07-2008 12:07 PM
    • Replies: 2
    • Views: 2,815
    02-07-2008, 02:05 PM Go to last post
  30. Need help getting started

    edit.......

    Started by ktoph‎, 02-07-2008 07:25 PM
    • Replies: 0
    • Views: 2,069
    02-07-2008, 07:25 PM Go to last post
  31. Demography Probability Question

    Question: What is the probability of having a livebirth (L) at a second birth given that the outcome of the first pregnancy was a stillbirth (D)?...

    Started by wankel‎, 02-07-2008 02:29 AM
    • Replies: 3
    • Views: 2,639
    02-07-2008, 09:58 PM Go to last post
  32. Maximizing Hourly Profit

    A stock day trader has a winning system and he wants to maximize his profit per hour. He has found that when he trades 5 hours a day, 90% of the time...

    Started by Larry‎, 02-08-2008 02:39 PM
    • Replies: 0
    • Views: 2,098
    02-08-2008, 02:39 PM Go to last post
  33. Unhappy Need Help on Probability Probs.

    :confused: I'm having trouble with some problems: 1) Suppose that in a family, the probability of a child having black hair is .45, the...

    Started by ajk003‎, 02-17-2006 03:37 PM
    • Replies: 7
    • Views: 3,137
    02-09-2008, 11:27 AM Go to last post
  34. Lightbulb Bayes Theorem

    I have been doing some problems with Bayes Theorem, but I have one question that is more complex than the others and was wondering if anyone can help...

    Started by AStudent‎, 02-09-2008 11:03 AM
    • Replies: 1
    • Views: 3,100
    02-10-2008, 08:29 PM Go to last post
  35. Thumbs up finding e10 need help lost

    Given the sample space S={e1, e2, e3, …, e10}, where P(e1)=P(e3)=P(e5)=P(e7)=P(e8)=P(e9)=0.1 and P(e2)=0.05, P(e4)=0.12, p(e6)=0.14. Consider the...

    Started by darktek‎, 02-11-2008 01:16 AM
    • Replies: 0
    • Views: 2,308
    02-11-2008, 01:16 AM Go to last post
  36. Probability Question

    A billion thanks to anyone who can help me with this problem: Let's say that there is a deck of only six cards labeled A through F And each...

    Started by ATTC‎, 02-11-2008 08:29 PM
    • Replies: 0
    • Views: 1,861
    02-11-2008, 08:29 PM Go to last post
  37. h3Lp ()n cond'l prob and indePendence

    guys, i need help w!th this one. Please. thank y0u in adv. ---- a c()mpany's mngt made a certain proposal t0 its representatives in d!fferent...

    Started by krispykreme26‎, 02-12-2008 12:23 AM
    • Replies: 0
    • Views: 1,997
    02-12-2008, 12:23 AM Go to last post
  38. Probablity Question

    So I need help!!! For a sales promotion, the manufacturer places winning symbols under the caps of 10% of all Pepsi bottles. You buy a six-pack. ...

    Started by smacly2‎, 02-11-2008 08:57 PM
    • Replies: 1
    • Views: 6,197
    02-12-2008, 01:43 AM Go to last post
  39. Help.....

    Can someone please help me. I have been working on this problem and cannot figure it out. I know it deals with the multiplecation rule, and that...

    Started by triathlete 1‎, 02-14-2008 12:32 PM
    • Replies: 0
    • Views: 2,360
    02-14-2008, 12:32 PM Go to last post
  40. Help me please.. (expected value) Thanks

    Suppose that 20 percent of the students who took a certain test were from school A and the average of their scores on the test was 65. Also,...

    Started by cpalad‎, 02-15-2008 03:42 PM
    • Replies: 1
    • Views: 2,826
    02-16-2008, 03:51 PM Go to last post
  41. poisson probability problem

    I have constructed this experiment to better understand poisson probabilities. Problem: There are two sets of data: lets choose a poisson type...

    Started by Dan The Man‎, 02-15-2008 05:54 PM
    • Replies: 1
    • Views: 2,708
    02-16-2008, 04:00 PM Go to last post
  42. Tossing a coin

    Hi everybody and sorry about my English I’ve a simple question and it seems typical but please before answering it thinks carefully because it is...

    Started by Protein‎, 02-17-2008 05:04 AM
    • Replies: 5
    • Views: 2,949
    02-17-2008, 10:50 AM Go to last post
  43. Expected value of sup - MLE

    Hey guys Im struggeling to show the existence of an expeted value of a sup. The problem is to find the supremum of the absolute value of the...

    Started by nonparametric‎, 02-17-2008 07:57 PM
    • Replies: 0
    • Views: 3,777
    02-17-2008, 07:57 PM Go to last post
  44. Need Help-Probability Marbles

    Would appreciate help with this probability problem. A bag of marbles contains 6 red marbles, 5 green marbles, and 4 yellow marbles. Three marbles...

    Started by Puffkin123‎, 02-19-2008 04:47 AM
    • Replies: 1
    • Views: 2,141
    02-19-2008, 08:52 AM Go to last post
  45. Probability Problem Question

    Hello all, I'm struggling quite mightily with this one problem (embarrassing to me once you see how simple it is). I've been trying to figure it...

    Started by Kanekutter05‎, 02-21-2008 11:39 AM
    • Replies: 4
    • Views: 2,478
    02-21-2008, 06:00 PM Go to last post
  46. Probability Problem

    Hi all, I have been trying to come up with the correct answer for part c) of this question with no luck. A gumball dispenser has 38 orange...

    Started by biff44‎, 02-22-2008 01:42 PM
    • Replies: 4
    • Views: 5,656
    02-22-2008, 04:09 PM Go to last post
  47. Probability with Normal model.

    According to the NHS, heights of adults may have a normal model with mean heights of 69.1" for men and 64.0" for women. The respective standard...

    Started by Patriot4913‎, 02-22-2008 12:10 AM
    • Replies: 5
    • Views: 2,470
    02-22-2008, 08:34 PM Go to last post
  48. Easy problem, unsure on terminology

    According to infoplease, 18.8&#37; of the luxury cars manufactured in 2003 were silver. A large dealership typically sells 50 luxury cars a month. Let...

    Started by Patriot4913‎, 02-22-2008 12:19 AM
    • Replies: 5
    • Views: 3,318
    02-22-2008, 08:35 PM Go to last post
  49. Significance testing with probabilities of 100 percent

    Hi, I have a question that I am beginning to believe may not even make sense mathematically, as I have tried to google it for hours with no luck:...

    Started by gearl42‎, 02-20-2008 04:11 PM
    • Replies: 5
    • Views: 3,142
    02-24-2008, 01:09 PM Go to last post
  50. Variance

    You have a total of $1 to invest in investments X and Y that have the same expected return. It is known that Var(X) = 25 and Var(Y) = 36. a) If X...

    Started by probablyme‎, 02-24-2008 04:29 PM
    • Replies: 1
    • Views: 2,010
    02-24-2008, 04:50 PM Go to last post
  51. Help with problem on expected value, covariance, and mean of linear function

    I attached a picture of the problem I am having trouble with. I know how to do a (just add the rows and columns). I'm a little confused on b,...

    Started by zswanson17‎, 02-24-2008 09:34 PM
    • Replies: 2
    • Views: 3,087
    02-24-2008, 10:01 PM Go to last post
  52. I think I got it, but then... (A DRINKING GAME!)

    400 accidents on a Saturday night were analyzed: Number of vehicles involved & whether alcohol played a role in the accident. The numbers are in the...

    Started by probablyme‎, 02-24-2008 04:10 PM
    • Replies: 3
    • Views: 3,181
    02-25-2008, 03:19 AM Go to last post
  53. help

    I can not figure this problem out! I don't think there is enough info, but there is an answer in the back: 0.271 The problem: Using Composite...

    Started by KobeLove08‎, 02-24-2008 11:00 PM
    • Replies: 2
    • Views: 5,248
    02-25-2008, 01:09 PM Go to last post
  54. Standard deviations and profits?

    So this is another question I attempted to solve but was stuck on the 2nd part of it: A store knows that the number of pies sold each day varies...

    Started by probablyme‎, 02-25-2008 02:52 AM
    • Replies: 1
    • Views: 5,808
    02-25-2008, 01:16 PM Go to last post
  55. Batting Average & Probability

    A softball team's first 4 hitters are Sam (batting average .500), Gina (batting average .400), Tom (batting average .737), and Kerry (batting average...

    Started by smileysara2008‎, 02-26-2008 01:40 PM
    • Replies: 1
    • Views: 5,301
    02-26-2008, 01:43 PM Go to last post
  56. sealed bid problem

    Your company is making a sealed bid for a construction project. If your firm has the lowest bid, you will pay another firm (a subcontractor) 140...

    Started by trbbls‎, 02-26-2008 03:15 PM
    • Replies: 1
    • Views: 4,382
    02-26-2008, 05:27 PM Go to last post
  57. Real Roots??

    :eek: I have no idea where to start on this one If a is uniformly distributed over , what is the probability that the roots of the equation...

    Started by trbbls‎, 02-26-2008 08:56 PM
    • Replies: 0
    • Views: 3,001
    02-26-2008, 08:56 PM Go to last post
  58. Success by chance?

    I have a problem where participants had to discriminate two objects, and success was defined was getting 9 correct in a 10 trial run - meaning that...

    Started by meglovestulips‎, 02-21-2008 10:48 AM
    • Replies: 10
    • Views: 3,744
    02-27-2008, 11:27 AM Go to last post
  59. Help please! I can't seem to make sense of these!

    A test consists of 10 true/false questions. To pass the test a student must answer at least 6 questions correctly. If a student guesses on each...

    Started by LES‎, 02-27-2008 03:53 PM
    • Replies: 1
    • Views: 4,242
    02-27-2008, 04:34 PM Go to last post
  60. Question Help with these two questions, please? I am confused!

    Hello Everyone, These are part of my unit on Binomial and Poisson distributions: 1) The average number of phone inquiries per day at the center...

    Started by fitnesskitty‎, 02-27-2008 02:17 PM
    • Replies: 7
    • Views: 2,546
    02-27-2008, 09:27 PM Go to last post

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