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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: 30,326
    09-30-2005, 09:44 AM Go to last post
  1. Unhappy finding probability

    According to the Bureau of Navel Standards, 75 percent of all people are "inners," (that is their belly buttons poke inward); everyone else is an...

    Started by summertigger‎, 12-18-2005 09:21 PM
    • Replies: 7
    • Views: 5,176
    04-27-2006, 01:03 PM Go to last post
  2. I need help with homework please.

    The teacher just kind of highlights the basics of it and tells us to read the chapter but the book makes absolutely no sense whatsoever. If someone...

    Started by anangelofastar‎, 02-27-2012 10:00 PM
    • Replies: 1
    • Views: 5,174
    02-27-2012, 10:20 PM Go to last post
  3. Help with draw of random numbers

    Hi I would like some help with the formula to work out the following problem. If you have the numbers 1-80 and you draw 20 unique numbers from the 80...

    Started by Peeledseal‎, 01-02-2011 04:57 AM
    • Replies: 3
    • Views: 5,163
    01-03-2011, 10:58 AM Go to last post
  4. How to find mean and variation from information given?

    I am very lost, my teacher gives us a bunch of notes that make absolutely no sense to me. This is the question im stuck on: -- 41% of adults have...

    Started by GrimGorilla‎, 10-30-2014 02:28 PM
    • Replies: 4
    • Views: 5,159
    10-30-2014, 03:33 PM Go to last post
  5. 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: 5,157
    07-25-2011, 11:53 PM Go to last post
  6. Examples of strictly stationary sequence?

    Hi. I come across this 'stationary' term quite frequent. I find 'stationary increment' in Poisson process. But, now, in extreme value theory, i find...

    Started by tsukiko‎, 05-03-2010 05:25 AM
    • Replies: 0
    • Views: 5,156
    05-03-2010, 05:25 AM Go to last post
  7. Difficulty correlating terminology with symbols.

    The book we are using for this class uses words instead of the symbols in some of the homework problems we are using. My question is: Is P(A...

    Started by Toaster Oven‎, 02-17-2006 12:00 PM
    • Replies: 2
    • Views: 5,155
    02-17-2006, 12:11 PM Go to last post
  8. Discrete Probability

    I am not sure if I am doing this question right so I just want to verify. Viruses such as Trojan programs and worms, reach networks by requests...

    Started by sp00ky‎, 11-03-2007 06:59 PM
    • Replies: 1
    • Views: 5,155
    11-08-2007, 02:45 PM Go to last post
  9. Probability problem

    Hello everyone, I don't know how to calculate a probability, relating a lotto game. The problem is: if I choose 10 random numbers in a 6/49 game,...

    Started by 0112358‎, 06-23-2008 09:10 AM
    • Replies: 0
    • Views: 5,155
    06-23-2008, 09:10 AM Go to last post
  10. Probability Problem

    I need some help with this probability problem. On any given day, Jen will sell 85% of her baked goods. For a sample of 500 potential customers,...

    Started by Mancolt‎, 04-23-2007 10:46 PM
    • Replies: 1
    • Views: 5,152
    04-24-2007, 01:15 AM Go to last post
  11. What data transformation should I apply to count data, which includes zero values?

    What data transformation should I apply to count data, which includes zero values and follows the negative binomial distribution, prior to the...

    Started by oscillate_wildly‎, 05-12-2010 06:28 PM
    • Replies: 1
    • Views: 5,150
    05-13-2010, 10:27 AM Go to last post
  12. Lightbulb probability help

    I'm not looking for simply the answer but i need to know the step by step solution process, and what formula you used if any to solve for it please....

    Started by ecohelp‎, 09-17-2005 09:32 PM
    • Replies: 7
    • Views: 5,148
    09-18-2005, 11:18 AM Go to last post
  13. probability using combinations/permutations

    a student has an exam, the teacher gives 30 questions and 10 of the 30 will be on the final exam. if the student knows how to solve 25 of the 30,...

    Started by subopolois‎, 02-04-2009 11:33 PM
    • Replies: 1
    • Views: 5,147
    02-05-2009, 01:08 AM Go to last post
  14. Can't seem to figure this one out...

    This question must be trickier than I thought: A statistics professor and his wife are planning to take a 2-week vacation in Hawaii, but they...

    Started by furcal201‎, 03-02-2010 11:12 AM
    • Replies: 1
    • Views: 5,145
    03-02-2010, 02:35 PM Go to last post
  15. 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: 5,143
    02-07-2008, 11:01 AM Go to last post
  16. Probability of Selection of committee officers

    I have tried several ways to do this problem, but I am stumped!! My original answer which was wrong was 4 nPr 4/12 nCr 4 = 24/11880 = There is a...

    Started by ealeql‎, 06-26-2010 08:47 PM
    • Replies: 3
    • Views: 5,143
    06-27-2010, 02:58 PM Go to last post
  17. Find the joint density of Z=X+Y,W=X-Y

    Question:Let X,Y be independent random variables with X~Exp(lambda1) and Y=~Exp(lambda2). Find the joint density of Z=X+Y,W=X-Y ...

    Started by amjadsuhail‎, 10-04-2008 03:14 PM
    • Replies: 1
    • Views: 5,142
    10-04-2008, 09:14 PM Go to last post
  18. normal approximation to binomial

    Hi Guys, I was solving a question and got wrong answer, don't know why... X~Bin(100,0.2) P(15<X<22) = ? I used the normal approximation: ...

    Started by WeeG‎, 03-12-2011 01:45 PM
    • Replies: 5
    • Views: 5,139
    03-13-2011, 04:54 AM Go to last post
  19. pemutation

    how many permutations of three items can be selected from a group of six? Us the letters A, B, C, D, E, and F to identify the items, and list each...

    Started by mpc2000‎, 10-27-2007 05:37 PM
    • Replies: 0
    • Views: 5,135
    10-27-2007, 05:37 PM Go to last post
  20. Hopefully an easy 'first post'!

    Hi All. I'm a newbie to the forums, and will hopefully introduce myself with an eay-enough question on probability! OK, here goes: I have...

    Started by madnesstiger‎, 09-05-2008 07:28 AM
    • Replies: 14
    • Views: 5,135
    09-09-2008, 03:01 PM Go to last post
  21. calculating expectation and variance

    Hi, I wanted to know if i'm on the right track with this problem. So far, for expectation I multiply 15/60 and 12. Not sure if this is correct....

    Started by Andiem‎, 02-01-2009 02:00 PM
    • Replies: 4
    • Views: 5,135
    02-01-2009, 02:17 PM Go to last post
  22. Random Walk, Programming it.

    Hi, I've recently became interested in learning about stochastic processes so after a bit of light reading, i decided to put this into action. I...

    Started by jamesmartinn‎, 04-13-2012 10:25 PM
    • Replies: 4
    • Views: 5,135
    04-25-2013, 03:50 PM Go to last post
  23. Envelope-letter matching problem

    Suppose we have "n" envelopes and "n" letters and we put letters to envelopes at random. Let I_i = I({i-th letter matches}) =1 if the i-th letter...

    Started by kingwinner‎, 07-10-2009 03:40 AM
    • Replies: 1
    • Views: 5,133
    07-10-2009, 06:34 AM Go to last post
  24. Expected Value of stocastically independent random variables

    Hello. This seems like an easy problem, but I'm having trouble getting started. Hopefully someone can give me a hint. X_1,...,X_n are...

    Started by moberle‎, 05-30-2007 01:42 PM
    • Replies: 3
    • Views: 5,130
    05-30-2007, 04:17 PM Go to last post
  25. statistics

    if T follows a t7 distribution, find t0 such that P(|T|<t0)=.9 and P(T>t0)= .05

    Started by sonpham‎, 10-17-2011 08:36 PM
    • Replies: 2
    • Views: 5,130
    10-18-2011, 08:07 AM Go to last post
  26. Exclamation True or False Probability ?

    A used car lot has 15 cars. Five of these cars were manufactured in the US and the remainder were made in other countries. If two cars are...

    Started by jessi‎, 10-09-2005 04:13 PM
    • Replies: 1
    • Views: 5,124
    10-09-2005, 04:23 PM Go to last post
  27. Probability Density Function

    Given that: f(y1, y2) = 3 - 3y2 where 0 < y1 < y2 < 1 I'm trying to find the probability: P(Y1 < .5|Y2 < .75), which is a conditional density. ...

    Started by structstat‎, 09-22-2006 09:43 PM
    • Replies: 1
    • Views: 5,122
    09-27-2006, 12:01 PM Go to last post
  28. converting geometric distribution to the exponential family

    converting geometric distribution to the exponential family f(x,p)=p^x*(1-p) does anyone know how to do this

    Started by mitz‎, 03-30-2011 01:53 AM
    • Replies: 1
    • Views: 5,114
    03-30-2011, 09:01 AM Go to last post
  29. Question Probability Question

    Hi, I have two questions that I'm currently struggling with, the first one states that there are 40 red balls, 40 green balls, and 20 blue balls....

    Started by Megan‎, 11-03-2006 07:54 PM
    • Replies: 1
    • Views: 5,111
    11-04-2006, 08:27 AM Go to last post
  30. Exclamation Help! Test Tomorrow

    O.K. Here is my question that I am struggling with: Of all college freshman that try out for the track team, the coach will accept only 30%. If 15...

    Started by jjmeans‎, 04-20-2006 11:24 PM
    • Replies: 0
    • Views: 5,110
    04-20-2006, 11:24 PM Go to last post
  31. Percentile of a Poisson variable

    Hi, How can I find the 90th percentile of a Poisson random variable with lamba = 0.4 ? I tried: e-0.4 (0.4^.90) / 0.9! but this gives...

    Started by Silvanus‎, 11-03-2008 12:17 AM
    • Replies: 3
    • Views: 5,110
    11-03-2008, 04:16 PM Go to last post
  32. Symmetric distribution

    Hi everyone! I am trying to understand the solution of a problem. "It says that x has a symmetric distribution, so that E=0, where mu=E". Now,...

    Started by rravina‎, 01-19-2010 03:10 PM
    • Replies: 2
    • Views: 5,103
    01-19-2010, 09:33 PM Go to last post
  33. Bivariate Normal Distribution

    I can't figure out this problem. The definition for Bivariate Normal Distribution is too long and complicated to type, but can be easily found if...

    Started by mahu‎, 05-02-2012 02:51 AM
    bivariate normal
    • Replies: 1
    • Views: 5,103
    05-02-2012, 03:12 AM Go to last post
  34. Probabilities in a 7-game series

    This probably isn't relevant, but this is not homework help. I'm just a curious adult who hasn't taken a stastics class in a few years so I'm pretty...

    Started by cornonthecob‎, 01-11-2012 03:09 PM
    • Replies: 3
    • Views: 5,097
    01-11-2012, 03:36 PM Go to last post
  35. Bayesian inference -(unknown mean and variance | and a proof)

    hello, i take a bayes lesson. there are 3 questions as my homework, i did one of them. i am new to statistics, so instructor said i can get help as...

    Started by aliyilmaz‎, 10-22-2010 09:47 AM
    • Replies: 4
    • Views: 5,095
    10-22-2010, 05:07 PM Go to last post
  36. Confusing...

    Hi,i want to ask.....(let X=sample mean) 1.what is the prob that the sample mean will be smaller then 100 or larger than 50? so my expression is:...

    Started by ho168‎, 12-21-2010 11:26 AM
    • Replies: 3
    • Views: 5,091
    12-23-2010, 06:56 AM Go to last post
  37. Normal distribution random variates and Chi square test

    Hi, I'm having problems "verifying" normal random variates using a Chi square test, in as much as I'm getting unexpectedly (to me at least) high...

    Started by MichaelWG‎, 05-24-2011 05:54 PM
    • Replies: 3
    • Views: 5,090
    05-25-2011, 03:04 PM Go to last post
  38. Probability question help!!!!

    I'm stuck and could use some help. I am finishing my hw and stumbled upon two problems that I cannot figure out out to do. 1. It has been...

    Started by mrsprop‎, 10-26-2012 01:35 PM
    • Replies: 2
    • Views: 5,089
    10-30-2012, 12:38 AM Go to last post
  39. Matching sets on Dice

    For those of you who know dice, I have this question: You roll multiple dice (with the same number of sides), what are the chances of getting...

    Started by ArmoredThirteen‎, 01-08-2011 05:43 PM
    dice
    • Replies: 6
    • Views: 5,080
    01-25-2011, 01:05 AM Go to last post
  40. Please help with expected value

    In the casino game called High-Low, there are three possible bets. Assume that $1 is the size of the bet. A pair of fair six-sided dice is rolled and...

    Started by lincolntran‎, 06-07-2006 03:20 PM
    • Replies: 1
    • Views: 5,079
    07-19-2006, 09:20 AM Go to last post
  41. Stuck on a problem that should be easy

    So this is one of the first problems in our chapter on probability. I'm assuming I am supposed to intuit how to do this, because there are no other...

    Started by Turbowaffle‎, 09-19-2006 01:14 PM
    • Replies: 6
    • Views: 5,077
    09-19-2006, 02:57 PM Go to last post
  42. My probability practise

    Hi, I am just trying to improve my probability concepts.. I came across this question.. Just let me know if I am correct? Thanks here is the...

    Started by SadieKhan‎, 09-07-2010 02:28 PM
    • Replies: 4
    • Views: 5,070
    09-08-2010, 04:30 AM Go to last post
  43. limits and independent rvs

    Let X_1, X_2,... be a sequence of independent r.v.'s with EX_i = miu_i, Var(X_i) = (sigma_i)^2, i= 1, 2,.... Assume that: i) lim n-> inf (...

    Started by azazaz‎, 04-08-2009 08:52 AM
    • Replies: 2
    • Views: 5,064
    04-10-2009, 08:30 AM Go to last post
  44. Help with Binomial & Poisson Distribution!!

    Hello forum! I am trying to do complete my homework however I am unsure if I did what was asked correctly for one question and I am having issues...

    Started by FcNo‎, 02-24-2011 01:39 PM
    • Replies: 4
    • Views: 5,048
    02-25-2011, 12:13 PM Go to last post
  45. Confidence Interval HELP Plz

    Plz Help!!!!!!! I can't figure this out Confidence interval for the population mean: Use of the t distribution A corporation that maintains a...

    Started by wengermel‎, 08-20-2007 05:09 PM
    • Replies: 1
    • Views: 5,038
    08-21-2007, 11:13 AM Go to last post
  46. Solving probability questions (proofs)

    Hi all, I'm sometimes not sure whether I should answer a true/false probability question by using the axioms/formulae, or if I should give a...

    Started by windshear‎, 05-01-2011 10:35 AM
    • Replies: 1
    • Views: 5,035
    05-02-2011, 11:28 AM Go to last post
  47. Multinomial Distribution Question

    Demonstrate that the multinomial probability mass function sums to 1 for all possible values of y. Demonstrate that the expected value of Y_i =...

    Started by Giacomo‎, 10-05-2009 03:02 PM
    • Replies: 1
    • Views: 5,027
    10-06-2009, 02:29 AM Go to last post
  48. Normality of predictors - negative binomial regression

    Hi guys, As a part of my current research project I'm conducting a sequence of negative binomial regressions with counts of crime offences from...

    Started by CowboyBear‎, 03-03-2009 08:10 PM
    • Replies: 2
    • Views: 5,024
    03-06-2009, 09:02 PM Go to last post
  49. Expectation of random vectors.

    Hi there. I'm trying to prove: Cov(X,Y) = E(XY') - E(X)(E(Y))' So i know the cov of 2 random vectors is written by Cov(X,Y) = E can...

    Started by c2q‎, 11-06-2011 02:25 PM
    • Replies: 9
    • Views: 5,021
    11-06-2011, 03:27 PM Go to last post
  50. 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: 5,019
    08-08-2011, 02:36 AM Go to last post
  51. Probability & Food Poisoning

    Could the probability of this situation be calculated? Seven of my family members contracted food poisoning. The health department says we must of...

    Started by Dralter‎, 11-26-2011 04:32 PM
    • Replies: 1
    • Views: 5,016
    11-26-2011, 06:10 PM Go to last post
  52. Probability question. Pi = ??

    Q: It is noted that 8% of abc students are left handed, if 20 students are randomly selected, calculate Probability that none of them are left...

    Started by tiochaota‎, 05-17-2014 04:23 AM
    • Replies: 4
    • Views: 5,010
    05-19-2014, 02:31 AM Go to last post
  53. 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: 5,008
    05-05-2008, 01:12 PM Go to last post
  54. Help with basic proportions

    The Saloon claims that their pints, on average, are 16 ounces. To test whether the Saloon is actually pouring LESS than 16 ounces (at the .025...

    Started by brownclown‎, 10-11-2010 08:02 PM
    • Replies: 0
    • Views: 5,006
    10-11-2010, 08:02 PM Go to last post
  55. 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: 5,000
    01-30-2008, 03:43 PM Go to last post
  56. Chi-Square Test

    Hi guys, Was hoping that someone can help me with a Chi-Square test I'm attemtping. I understand the mechanics of the test and how to...

    Started by jpkoch74‎, 06-08-2009 05:48 AM
    • Replies: 9
    • Views: 5,000
    06-09-2009, 07:23 AM Go to last post
  57. product of N normal distributions

    We are given N normal functions, with means \mu_i, and variances \sigma_i^2, i in 1...N. I need to find a formula for the product of the N...

    Started by Camilo‎, 08-25-2011 12:26 AM
    gaussian, gaussian distribution, normal curve
    • Replies: 2
    • Views: 5,000
    08-26-2011, 05:06 PM Go to last post
  58. Discrete Probability

    Suppose that X is a normal random variable with mean 5. If P{X>9} = 0.2, approximately what is Var(X)?

    Started by hellostats‎, 11-04-2007 12:12 AM
    • Replies: 1
    • Views: 4,991
    11-04-2007, 07:12 AM Go to last post
  59. i need help with this question of probability!

    I need help with answering this questions. Suppose that the fills in the soda pop bottle are normally distributed with mean 32.2 ounces and st...

    Started by skdjk100‎, 10-20-2010 08:50 PM
    • Replies: 1
    • Views: 4,985
    10-20-2010, 09:16 PM Go to last post
  60. Probability Mass Function

    I am given that X follows the geometric distribution and asked to give the probability mass function for X^2. I know that the probability mass...

    Started by math_guy314‎, 10-07-2010 08:38 AM
    • Replies: 5
    • Views: 4,981
    10-08-2010, 11:23 AM Go to last post

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