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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: 30,322
    09-30-2005, 09:44 AM Go to last post
  1. expected value, uniform distribution

    Hi everyone, i have a weird question and here it goes, if x is uniformly distributed within the region (0,1]. How should I find E where...

    Started by anavia‎, 07-11-2010 05:55 AM
    • Replies: 1
    • Views: 4,348
    07-11-2010, 11:27 AM Go to last post
  2. Help

    an auther flips a coin 100 times in order to decide whether to use he or she in his book. If it's heads, he uses he. If it's tails, he uses she. What...

    Started by FailureAtStatistics‎, 06-29-2010 01:39 PM
    • Replies: 4
    • Views: 2,593
    07-11-2010, 08:53 AM Go to last post
  3. The Minimum of n Independent Normal Distributions

    This is a very good article, on the subject of the distribution of the minimum of several random variables, by Joshua Hill: ...

    Started by kajamix‎, 07-09-2010 02:15 PM
    • Replies: 2
    • Views: 10,212
    07-10-2010, 03:47 AM Go to last post
  4. Weird Question

    Hello all! I have sort of a weird question / request. I'll be taking Mathematical Statistics I and II come Sept and I really want to brush up...

    Started by jamesmartinn‎, 07-08-2010 11:36 AM
    • Replies: 4
    • Views: 3,976
    07-08-2010, 09:18 PM Go to last post
  5. sample size for a probit analysis

    Hi there, I am conducting a hydrocarbon toxicity research using mosquito larvae as target. The idea of this research is to estimate the relative...

    Started by amaoago‎, 07-07-2010 06:08 PM
    • Replies: 0
    • Views: 4,524
    07-07-2010, 06:08 PM Go to last post
  6. lognormal distributions for classified income data

    hi, i got a big problem that i need to solve for my masterthesis in sociology :shakehead... i have household income data that (classified) and...

    Started by fuchsi‎, 07-07-2010 05:18 PM
    • Replies: 0
    • Views: 2,633
    07-07-2010, 05:18 PM Go to last post
  7. Cumulative combinations

    I wish to determine the probability of a team winning AT LEAST eight of its next ten games. I understand that 10C8 will tell me the probability of...

    Started by johnnic‎, 07-04-2010 04:55 AM
    • Replies: 5
    • Views: 4,563
    07-04-2010, 10:12 AM Go to last post
  8. Interesting problem

    I have a list of 10,000 companies along with their annual revenues. These companies are classified as either small or large (there is a strict...

    Started by statmobile‎, 07-02-2010 01:57 PM
    • Replies: 5
    • Views: 3,187
    07-02-2010, 10:45 PM Go to last post
  9. Help with a probability problem

    You have a deck of 60 cards which contains 4 red and 4 blue cards. You draw 7 cards from the deck, what is the probability that you'll have at least...

    Started by Actree‎, 07-01-2010 09:10 PM
    • Replies: 5
    • Views: 2,988
    07-02-2010, 12:02 AM Go to last post
  10. Help on Expected Value

    Thanks everyone! Now I understand it, the keyword is independent! :) My Answer: If I understand it right, since there are 3 dice, the...

    Started by juantamad‎, 07-01-2010 03:48 AM
    • Replies: 2
    • Views: 4,055
    07-01-2010, 01:28 PM Go to last post
  11. Question Will rounding off Standard Deviation Bins cause error on Histogram?

    I am creating a Histogram. I have about 100 points of data and I am using MS Excel's Histogram function to create the "Bins". The data points I have...

    Started by andygarcia‎, 06-25-2010 10:04 AM
    • Replies: 4
    • Views: 6,730
    06-30-2010, 11:34 AM Go to last post
  12. Sampling Probability

    Hi, Can anyone help with this problem: If i have a given volume (v) that contains a number of discrete particles (p) randomly distributed...

    Started by PresterJohn‎, 06-22-2010 07:18 AM
    • Replies: 10
    • Views: 7,689
    06-29-2010, 07:29 AM Go to last post
  13. A probability question

    A spider eats 3 flies a day. Until the spider fills his quota a fly has a 50% chance of survival if he attempts to pass the web. Assuming 5 flies...

    Started by tennis89‎, 06-28-2010 10:28 PM
    • Replies: 1
    • Views: 4,467
    06-29-2010, 12:59 AM Go to last post
  14. A probability question

    52 cards, 13 values (A to K) and 4 suits. what's the probability of getting 5 cards with a four-of-a-kind (same value)? My solution: first card...

    Started by tennis89‎, 06-28-2010 12:08 PM
    • Replies: 4
    • Views: 2,670
    06-28-2010, 01:25 PM Go to last post
  15. Distribution function question please.

    Hi guys, I have this problem: "The degree of efficiency of the solar cells produced by the company PhotoEnergy is distributed according to...

    Started by robert_robert‎, 06-27-2010 06:02 PM
    • Replies: 1
    • Views: 2,588
    06-27-2010, 07:12 PM 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: 5,142
    06-27-2010, 02:58 PM Go to last post
  17. probability one

    Can someone help? The average number of pounds of meat a person consumes a year is 212.3 pounds. Assume that the standard deviation is 20 pounds....

    Started by rkain‎, 06-26-2010 01:27 PM
    • Replies: 1
    • Views: 3,379
    06-26-2010, 11:27 PM Go to last post
  18. F-Test Help

    I'm doing an F-test, something I don't think I've ever done before, and I'm a bit confused because I'm seeing different things. The problem asks...

    Started by JoynerCN‎, 06-26-2010 06:16 PM
    • Replies: 1
    • Views: 2,372
    06-26-2010, 07:08 PM Go to last post
  19. Bivariate Normal distribution

    I want to get the characteristic function of the bivariate normal distribution when both means =0 and variances =1 . I can't do the integration. In...

    Started by Emy‎, 06-26-2010 03:52 AM
    • Replies: 7
    • Views: 4,699
    06-26-2010, 02:28 PM Go to last post
  20. Proportion question

    Can someone please help, I don't know why but this question is giving me trouble-I am having a mental block. Thanks. The distance that one...

    Started by rkain‎, 06-26-2010 01:21 PM
    • Replies: 1
    • Views: 4,221
    06-26-2010, 01:28 PM Go to last post
  21. Bivariate Normal distribution

    I want to get the characteristic function of the bivariate normal distribution when both means =0 and variances =1 . I can't do the integration. In...

    Started by Emy‎, 06-26-2010 04:09 AM
    • Replies: 0
    • Views: 2,498
    06-26-2010, 04:09 AM Go to last post
  22. Pick 3 items, probability that A<B<C

    This question has been bugging me the last 24 hours or so, hopefully someone here can break it down for me. Say you have N number of items that...

    Started by pjyelton‎, 06-25-2010 12:23 PM
    • Replies: 3
    • Views: 5,592
    06-25-2010, 03:52 PM Go to last post
  23. Binary Logistic Regression Event Prob - Minitab

    Good Day To All, I am new to the site and could use a little clarification regarding the following: In Minitab, I have conducted a Step-Wise...

    Started by optomist1‎, 06-25-2010 10:31 AM
    • Replies: 1
    • Views: 4,208
    06-25-2010, 03:00 PM Go to last post
  24. Probability for t=.0419, two independent samples, sample size 10?

    Using a student's t-Test, I've found a t-Statistic of .0419 for two independent samples of 10. My problem is getting the corresponding p-Value....

    Started by JoynerCN‎, 06-25-2010 09:04 AM
    • Replies: 4
    • Views: 3,030
    06-25-2010, 11:55 AM Go to last post
  25. comparing two Poissonians

    What is the proper statistical test for the following: I know A1 and A2 to be Poisson distributed with (unknown) means x1 and x2. I have a single...

    Started by ee00‎, 06-21-2010 11:05 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 5,893
    06-23-2010, 12:36 PM Go to last post
  26. Student's t-Test -- just looking for confirmation

    For this particular t-Test, I'm comparing a sample with 16 values, mean 5.34, stdev .28 to a population whose mean is 5.27, stdev .08. I'm certain...

    Started by JoynerCN‎, 06-21-2010 10:39 PM
    • Replies: 2
    • Views: 4,098
    06-21-2010, 11:55 PM Go to last post
  27. Minor question on sample sizes

    Pardon the double-posting -- I'm not sure what this forum's culture is on creating new threads for new topics, but I tend to try to keep each topic...

    Started by JoynerCN‎, 06-17-2010 11:44 AM
    • Replies: 5
    • Views: 2,571
    06-21-2010, 10:33 PM Go to last post
  28. a little probability question

    An elevator goes from the ground floor up to the 8th floor (8 floors in total). In the elevator 10 people. Each one of them choose randomly and...

    Started by WeeG‎, 06-21-2010 09:53 AM
    • Replies: 2
    • Views: 2,412
    06-21-2010, 05:24 PM Go to last post
  29. poisson

    a little help with this one will also be appreciated ! The number of bugs in a computer is a Poisson random variable with a rate parameter of 3...

    Started by WeeG‎, 06-21-2010 09:57 AM
    • Replies: 1
    • Views: 2,700
    06-21-2010, 10:57 AM Go to last post
  30. Please help!

    thanks much for all ur help!!

    Started by probabilityguy‎, 04-26-2010 11:02 PM
    • Replies: 4
    • Views: 2,657
    06-19-2010, 12:55 AM Go to last post
  31. normal approximations

    One statistic used to assess professional golfers is driving accuracy, the percent of drives that land in the fairway. Driving accuracy for PGA...

    Started by natash‎, 06-17-2010 07:50 PM
    • Replies: 4
    • Views: 6,109
    06-18-2010, 05:05 PM Go to last post
  32. A question on Poisson distribution

    Hi, Let X1 and X2 be Poisson distributed variables with the same mean m and Y be defined as multiplication of X1 and X2 (Y=X1X2). How can i obtain...

    Started by jylces‎, 06-18-2010 06:46 AM
    • Replies: 2
    • Views: 4,163
    06-18-2010, 12:11 PM Go to last post
  33. very short question variance iid

    Let x1, x2,...xn iid random variables. Suppose that it is given that Var(Sum(x(i)))=S, can I claim that var(x(i))=S/n ? I guess that the...

    Started by leo nidas‎, 06-17-2010 02:13 PM
    • Replies: 2
    • Views: 2,938
    06-17-2010, 05:01 PM Go to last post
  34. central limit theorem basic question

    I have a basic question concerning the central limit theorem let the 2 by one vectors x1, x2, ..., xn come from a population with mean μ=' , and...

    Started by leo nidas‎, 06-17-2010 12:42 PM
    • Replies: 1
    • Views: 2,796
    06-17-2010, 02:47 PM Go to last post
  35. Help on comparing mean to distribution values

    Hi all, I'm new here -- I'm tutoring a student in Probability/Statistics, and I've come across a type of problem that I can't recall how to solve....

    Started by JoynerCN‎, 06-17-2010 09:49 AM
    • Replies: 7
    • Views: 3,774
    06-17-2010, 11:55 AM Go to last post
  36. Estimate Probabilites

    Hi All, I am interested in replicating in-game win probabilities for the NBA. There are a number of sites on the web that do this; sometimes it...

    Started by Btibert3‎, 06-13-2010 04:45 PM
    • Replies: 2
    • Views: 2,631
    06-15-2010, 07:30 PM Go to last post
  37. Probability inequalities

    I wanna solve following questions: 1-Let X be a discret random variable ,whose possible values are 1,2,....,If P(X=k)is nonincreasing in...

    Started by Emy‎, 06-04-2010 11:21 AM
    • Replies: 9
    • Views: 6,317
    06-15-2010, 04:22 PM Go to last post
  38. Permutation probability

    Hi all, I am trying to find the probability of the permutation of correlated random variables. The problem is: Let X_i be correlated normal...

    Started by springgengxin‎, 06-14-2010 05:16 PM
    • Replies: 2
    • Views: 2,449
    06-15-2010, 06:49 AM Go to last post
  39. discrepancy between summed binomial probability and expected value

    Hi all. Im writing a program to calculate statistics for a tabletop game, and I'm confused by a discrepancy between a calculated expected value...

    Started by hoylemd‎, 06-11-2010 11:00 AM
    • Replies: 1
    • Views: 2,730
    06-11-2010, 12:35 PM Go to last post
  40. Expected number of times until x occurs

    Hello all, I am just writing to see if this is right. There are two things that can occur. With a probability 1/a, event y occurs and you get a...

    Started by Salohcin‎, 06-10-2010 11:25 AM
    • Replies: 5
    • Views: 5,484
    06-10-2010, 10:30 PM Go to last post
  41. Figure out if there is any statistical significance

    Hi - I have some data on the internal temperature of cooked meat. The meat patty is a failure if the temperature obtained is below a certain...

    Started by mulamootil‎, 05-19-2010 07:13 PM
    • Replies: 8
    • Views: 11,649
    06-10-2010, 01:27 PM Go to last post
  42. Question Help Needed for Joint Distributions

    I'm fuzzy about the idea of joint distributions and would appreciate it if someone can please help me understand the concepts more clearly. My...

    Started by mlin0823‎, 06-09-2010 10:43 PM
    • Replies: 3
    • Views: 3,267
    06-10-2010, 10:02 AM Go to last post
  43. Simple probablility question

    A closet contains 8 pairs of shoes. If 4 shoes are randomly selected, what is the probability that there will be no complete pair? So i know that...

    Started by c2q‎, 06-08-2010 12:51 AM
    • Replies: 8
    • Views: 8,064
    06-08-2010, 05:53 PM Go to last post
  44. Smile Std. Dev as Response in Factorial Randomized Experiment

    Greetings, I am working with data generated from a 4 factor randomized experiment. Material is produced from the experimental process and is...

    Started by rlievense‎, 06-08-2010 12:35 PM
    • Replies: 0
    • Views: 2,702
    06-08-2010, 12:35 PM Go to last post
  45. Relation between n, p, q, and sigma

    I know the value of n and p. I am looking for the standard deviation and mean based on those values. I gather that the forumla for sigma, the...

    Started by ideaessence‎, 06-07-2010 04:48 PM
    • Replies: 1
    • Views: 12,675
    06-07-2010, 04:52 PM Go to last post
  46. Intersect of a compliment

    If E is .4 and F is .6 and E and F intersect at .1 where do the compliment of E and F intersect?

    Started by nchartw‎, 06-02-2010 02:55 AM
    • Replies: 2
    • Views: 3,106
    06-05-2010, 10:50 AM Go to last post
  47. Need Help!!

    Hi I have one question on probability that I am stuck on. The question is: Suppose we have a normal distribution with mean of 10 and standard...

    Started by miss‎, 06-05-2010 08:44 AM
    • Replies: 1
    • Views: 2,412
    06-05-2010, 09:49 AM Go to last post
  48. household selection probabilities for household surveys

    Hi, we are starting a survey with 2 stage cluster sampling approach. At first stage we select a fixed number of clusters from total population...

    Started by abeshkc‎, 06-04-2010 01:07 AM
    • Replies: 0
    • Views: 3,602
    06-04-2010, 01:07 AM Go to last post
  49. Looking for a method

    Hello, I have a statistical problem im trying to analyze, but i have no clue on what method to use. So what im looking for, at least initially, is...

    Started by Stirner‎, 06-03-2010 02:03 AM
    • Replies: 0
    • Views: 2,158
    06-03-2010, 02:03 AM Go to last post
  50. Bingo probability question

    Hello all, I have visited the wizzard of odds to get some answers on bingo probabilities but I have a new version that isn't included on that...

    Started by TERAS‎, 06-02-2010 03:53 AM
    • Replies: 0
    • Views: 3,385
    06-02-2010, 03:53 AM Go to last post
  51. dog sniff probability problem

    I am an attorney looking for some help on making sure I have my math correct for a false positive/false negative test. Assume: 10 out of 100 cars...

    Started by jrob15‎, 06-01-2010 10:31 AM
    • Replies: 3
    • Views: 3,238
    06-01-2010, 07:29 PM Go to last post
  52. Probability question

    I read this as a solution to a problem, but I'm not sure how to get it: Say we have k balls, of which 1 is red and k-1 are black, and k is odd. ...

    Started by winds‎, 05-31-2010 09:32 PM
    • Replies: 2
    • Views: 3,212
    06-01-2010, 05:56 PM Go to last post
  53. Difficult Integral standard normal pdf/cdf

    I would like to get an explicit analytical form for the integral (below)...or something close to it with an associated (small) error term. (Note that...

    Started by Dragan‎, 05-28-2010 11:37 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 13,939
    05-31-2010, 09:35 AM Go to last post
  54. Need help with a practice probability question for Exam P!

    Here is the question - The length of time, in years, that a person will remember an actuarial statistic is modeled by an exponential distribution...

    Started by uihiba‎, 05-30-2010 04:30 PM
    • Replies: 2
    • Views: 6,234
    05-31-2010, 03:19 AM Go to last post
  55. When dickey fuller test returns t statistics > 0

    When I ran the dickey fuller test on a variable, the test indicates that the t statistics is greater than zero and is greater than the absolute value...

    Started by childofprodigy‎, 05-29-2010 10:16 PM
    • Replies: 0
    • Views: 3,474
    05-29-2010, 10:16 PM Go to last post
  56. A very simple question, I think.

    Hi. I have what I think will be an easy question. Apologies if it's too trivial or if this is the wrong forum, I've never done stats, and really only...

    Started by st@ts‎, 05-29-2010 11:27 AM
    • Replies: 3
    • Views: 3,187
    05-29-2010, 04:04 PM Go to last post
  57. Reinforced Probability

    Hello All, I have been trying for ages to solve this, so any advice no matter how minimal would be greatly appreciated. Suppose there is some...

    Started by Salohcin‎, 05-27-2010 09:49 AM
    • Replies: 7
    • Views: 2,576
    05-28-2010, 11:02 AM Go to last post
  58. RPI Question / Alternative

    I run a competitive videogame website and am in the process of researching ways to rank teams competing in our quarterly league seasons. Briefly, I...

    Started by Thunberg‎, 04-15-2010 12:37 AM
    • Replies: 3
    • Views: 2,805
    05-27-2010, 11:35 PM Go to last post
  59. Calculating the expected value

    Hi, I have a strange problem. Following info is provided: Event insurance comp. allows promoters of any event to protect themselves from financial...

    Started by Ayyappa‎, 05-26-2010 01:28 PM
    • Replies: 1
    • Views: 3,481
    05-26-2010, 01:57 PM Go to last post
  60. gamma moments integral short question

    Hi there, About the moment generating function of the gamma distr. f(x)=λ^α/(Γ(α))x^(α-1)exp(-λx). is the pdf. ...

    Started by leo nidas‎, 05-25-2010 05:06 PM
    • Replies: 3
    • Views: 3,256
    05-26-2010, 04:46 AM Go to last post

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