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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. 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: 3,102
    02-24-2008, 10:01 PM Go to last post
  2. 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: 2,017
    02-24-2008, 04:50 PM Go to last post
  3. 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: 3,157
    02-24-2008, 01:09 PM Go to last post
  4. Easy problem, unsure on terminology

    According to infoplease, 18.8% 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: 3,337
    02-22-2008, 08:35 PM Go to last post
  5. 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: 2,494
    02-22-2008, 08:34 PM Go to last post
  6. 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: 5,684
    02-22-2008, 04:09 PM Go to last post
  7. 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: 2,491
    02-21-2008, 06:00 PM Go to last post
  8. 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: 2,151
    02-19-2008, 08:52 AM Go to last post
  9. 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: 3,804
    02-17-2008, 07:57 PM Go to last post
  10. 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: 2,970
    02-17-2008, 10:50 AM Go to last post
  11. 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: 2,722
    02-16-2008, 04:00 PM Go to last post
  12. 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: 2,843
    02-16-2008, 03:51 PM Go to last post
  13. 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: 2,385
    02-14-2008, 12:32 PM Go to last post
  14. 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: 6,245
    02-12-2008, 01:43 AM Go to last post
  15. 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: 2,012
    02-12-2008, 12:23 AM Go to last post
  16. 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: 1,872
    02-11-2008, 08:29 PM Go to last post
  17. 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: 2,317
    02-11-2008, 01:16 AM Go to last post
  18. 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: 3,110
    02-10-2008, 08:29 PM Go to last post
  19. 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: 3,149
    02-09-2008, 11:27 AM Go to last post
  20. 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: 2,109
    02-08-2008, 02:39 PM Go to last post
  21. 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: 2,656
    02-07-2008, 09:58 PM Go to last post
  22. Need help getting started

    edit.......

    Started by ktoph‎, 02-07-2008 07:25 PM
    • Replies: 0
    • Views: 2,091
    02-07-2008, 07:25 PM Go to last post
  23. 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% chance of drawing a...

    Started by NumberCruncher‎, 02-07-2008 12:07 PM
    • Replies: 2
    • Views: 2,836
    02-07-2008, 02:05 PM Go to last post
  24. 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: 3,096
    02-07-2008, 11:13 AM Go to last post
  25. 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: 5,161
    02-07-2008, 11:01 AM 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: 2,733
    02-06-2008, 10:59 PM Go to last post
  27. 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: 1,861
    02-04-2008, 05:47 PM Go to last post
  28. 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: 2,418
    02-02-2008, 05:22 PM Go to last post
  29. 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: 2,453
    02-01-2008, 03:58 PM Go to last post
  30. 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: 5,008
    01-30-2008, 03:43 PM Go to last post
  31. 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: 3,290
    01-30-2008, 03:08 PM Go to last post
  32. 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: 2,529
    01-30-2008, 09:05 AM Go to last post
  33. 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: 1,939
    01-29-2008, 10:07 PM Go to last post
  34. 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: 3,130
    01-29-2008, 09:57 PM Go to last post
  35. 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: 2,148
    01-28-2008, 05:21 AM Go to last post
  36. 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: 2,671
    01-25-2008, 11:10 PM Go to last post
  37. 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: 3,359
    01-25-2008, 02:34 PM Go to last post
  38. 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: 8,986
    01-23-2008, 11:32 PM Go to last post
  39. 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: 4,811
    01-21-2008, 06:59 PM Go to last post
  40. 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: 2,764
    01-21-2008, 06:24 PM Go to last post
  41. 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: 4,153
    01-21-2008, 11:11 AM Go to last post
  42. 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: 6,866
    01-18-2008, 03:59 PM Go to last post
  43. 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: 4,584
    01-18-2008, 02:40 PM Go to last post
  44. 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: 3,098
    01-17-2008, 10:57 PM Go to last post
  45. 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: 3,120
    01-17-2008, 02:01 PM Go to last post
  46. 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: 3,166
    01-14-2008, 01:12 PM Go to last post
  47. 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: 3,651
    01-08-2008, 09:10 AM Go to last post
  48. 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: 2,306
    01-05-2008, 12:39 PM Go to last post
  49. 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: 3,067
    01-05-2008, 10:01 AM Go to last post
  50. 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: 2,404
    01-02-2008, 03:09 PM Go to last post
  51. 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: 4,143
    01-02-2008, 09:11 AM Go to last post
  52. binomial distribution

    A "thinking" question I need help with regarding binomial distributions and I have no clue what they mean. Please help!! I can do the problems O.K....

    Started by cmojito‎, 12-29-2007 10:36 PM
    • Replies: 0
    • Views: 3,821
    12-29-2007, 10:36 PM Go to last post
  53. really stuck

    :( hello all. I am really struggling with analysing my data which i have collected for my report. I am using a 2 x 2 mixed ANOVA and i am not sure...

    Started by sophie786‎, 12-26-2007 05:14 PM
    • Replies: 0
    • Views: 2,490
    12-26-2007, 05:14 PM Go to last post
  54. Inverse gamma distributions & simulated annealing

    I've hit a problem trying to sample an inverse gamma distribution, 'scaled' using a temperature variable, T. If my distribution is defined as (where...

    Started by tbishop‎, 12-24-2007 07:16 AM
    • Replies: 0
    • Views: 2,852
    12-24-2007, 07:16 AM Go to last post
  55. Scrabble probability question?

    I have a question for you probability and statistics experts out there. At the beginning of scrabble to determine who starts, each person (in this...

    Started by blahb‎, 10-04-2007 01:11 PM
    • Replies: 4
    • Views: 9,152
    12-21-2007, 04:22 PM Go to last post
  56. Probability / Conditional Prob.

    Above is the question I'm trying to figure out.... I'm not sure if I'm correct, but attempting the problems results in: a. P<38 = .92 b....

    Started by Aeokie165‎, 12-18-2007 08:21 PM
    • Replies: 0
    • Views: 2,934
    12-18-2007, 08:21 PM Go to last post
  57. Mutual Information and Probability

    Hi, This is my first post in this forum :) I have some knowledge on statistics and probability but im stuck on a experiment im doing. ...

    Started by juanchoc‎, 12-17-2007 02:03 PM
    • Replies: 0
    • Views: 4,274
    12-17-2007, 02:03 PM Go to last post
  58. Card Problem--(More than meets the eye...hopefully)

    Hmm, wondering if anyone can solve this problem, and possibly know which game show it came from: Say that you have 3 cards you can choose from:...

    Started by cytoplasmic‎, 12-14-2007 03:27 AM
    • Replies: 2
    • Views: 3,258
    12-14-2007, 07:45 PM Go to last post
  59. Question Hi, Emergency Help for Final Please!!

    8 basketball players are to be selected to play in a special game. The players will be selected from a list of 27 players.If the players are...

    Started by northport24‎, 12-10-2007 07:01 PM
    • Replies: 3
    • Views: 3,976
    12-14-2007, 10:58 AM Go to last post
  60. Help on my final project Please!

    All questions seem to be connected to one another. I think I have been able to work out questions 1 and 2. I have however,spent hours trying to...

    Started by tina82‎, 12-13-2007 11:39 AM
    • Replies: 0
    • Views: 2,404
    12-13-2007, 11:39 AM Go to last post

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