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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: 30,307
    09-30-2005, 09:44 AM Go to last post
  1. Probabilty of picking higher number

    I am working on a webbased game, and need help with some probability. Player A rolls a 20 sided die with the numbers 1 through 20. Player B rolls...

    Started by coolant‎, 07-23-2008 06:49 PM
    • Replies: 12
    • Views: 3,545
    08-28-2008, 12:02 AM Go to last post
  2. Need to find the distribution function

    I have a probability function, and I would need the distribution for it, so I can calculate confidence intervalls. A nominal variable X can take R...

    Started by Goran_L‎, 08-21-2008 03:17 AM
    • Replies: 2
    • Views: 2,794
    08-27-2008, 03:13 AM Go to last post
  3. Area under the sampling distribution curve

    Hi, Given a random sample size of n=10 (from a normal population) and a standard deviation of 5, how can I calculate the area under the sampling...

    Started by Silvanus‎, 08-24-2008 08:22 PM
    • Replies: 2
    • Views: 4,622
    08-25-2008, 04:11 PM Go to last post
  4. Poll

    I have made a poll and I sent it to 10 people. 8 sent me it back and 6 made me some comments. I analyse that 3 say that they like RED. What can...

    Started by viwel‎, 08-21-2008 02:38 PM
    • Replies: 2
    • Views: 2,223
    08-23-2008, 09:47 AM Go to last post
  5. discrete approximation of continuous probabilty

    not sure how to state this, but... assume I want to randomly generate some discrete numbers in the range 1...k but i want them to be generated...

    Started by joep‎, 08-21-2008 01:55 PM
    • Replies: 4
    • Views: 3,766
    08-21-2008, 03:59 PM Go to last post
  6. cost estimating with probability

    i'm trying to do a quick cost estimation using this monte carlo program to see how it works but i'm also trying to factor in different types of risk...

    Started by gummibear‎, 08-19-2008 05:14 PM
    • Replies: 0
    • Views: 4,087
    08-19-2008, 05:14 PM Go to last post
  7. The smoke you smell is my brain on STATS- Please Help

    Just a little background if you can please bear with me. I live in Japan. I retired and am now living a pretty boring life. That is until I...

    Started by jacksondesuyo‎, 08-16-2008 07:27 AM
    • Replies: 1
    • Views: 1,957
    08-18-2008, 02:42 AM Go to last post
  8. Question Analyzing a difference in conditional probabilities

    Hi all, I would like to compare the conditional probabilities of an animal behaving in a certain way at two different treatment types. Say the...

    Started by jhunter‎, 08-04-2008 07:03 PM
    • Replies: 4
    • Views: 2,647
    08-14-2008, 12:33 PM Go to last post
  9. Interesting Probability Issue Here

    Hi folks, I have an interesting probability question that has come up in a real life situation, and I'd like to pose it to you. My company is...

    Started by drarum‎, 08-13-2008 02:53 PM
    • Replies: 1
    • Views: 1,968
    08-14-2008, 02:00 AM Go to last post
  10. probability concepts

    Hi, In Devore and Farnum (Applied Statistics and Scientists and Engineers), it gives this question on p. 210: "Suppose that there is a...

    Started by Silvanus‎, 08-13-2008 12:09 AM
    • Replies: 6
    • Views: 3,529
    08-13-2008, 07:16 PM Go to last post
  11. Exclamation totally dont understand please help....

    Hi everyone, I have an exam on Friday and I just cant seem to get me head on how to answer a probability question, And because I don’t fully...

    Started by jamesryan‎, 08-12-2008 12:04 PM
    • Replies: 2
    • Views: 2,350
    08-13-2008, 03:48 PM Go to last post
  12. autoregressive

    hi folks, i am using 2nd order autoregressive for prediction. my equation is y(t)=b1 + b2*y(t-1) + b3*y(t-2). i found the coefficients b1,...

    Started by ashraf_leaf‎, 08-12-2008 10:37 AM
    • Replies: 3
    • Views: 1,896
    08-13-2008, 11:14 AM Go to last post
  13. Mice in a maze probability puzzle

    I’ve got a probability puzzle I am trying to solve and was hoping somebody could help. It comes from some chemistry experiments I’m doing, and not...

    Started by chrisj‎, 08-08-2008 11:43 AM
    • Replies: 2
    • Views: 4,960
    08-13-2008, 10:51 AM Go to last post
  14. Question Just a tiny bit of assistance

    Among U.S. households, 24% have telephone answering machines. If a telemarketing campaign involves 2,500 households, find the probability that more...

    Started by chilipancakes‎, 08-12-2008 07:25 PM
    • Replies: 1
    • Views: 2,281
    08-12-2008, 09:30 PM Go to last post
  15. two questions for "poisson process"

    Hi: I have 2 questions regarding the poisson process... 1) Let{N(t), t>=0} be a poisson process of rate 1. Evaluate E( N(3) | N(2),N(1) ) ...

    Started by smallkai‎, 08-09-2008 06:43 PM
    • Replies: 1
    • Views: 2,008
    08-11-2008, 05:11 AM Go to last post
  16. Method for Bayes spam filtering

    I am trying to understand the method for Bayesian spam filtering given here http://en.wikipedia.org/wiki/Bayesian_spam_filtering It makes sense...

    Started by andrewz‎, 08-10-2008 04:35 PM
    • Replies: 0
    • Views: 1,700
    08-10-2008, 04:35 PM Go to last post
  17. Statistical significance for discrete data?

    I'm getting myself in a muddle and hoping someone can help! I am analysing a discrete data set - I am comparing my control and experimental group,...

    Started by 1982lu‎, 08-09-2008 09:28 AM
    • Replies: 0
    • Views: 2,441
    08-09-2008, 09:28 AM Go to last post
  18. Dummy variables and regression

    Hi there, I am using Y (with 6 categories) as an independent variable. In order to regress this variable with a dependent variable (Z), I had to...

    Started by Jana‎, 08-08-2008 01:40 AM
    • Replies: 1
    • Views: 3,983
    08-08-2008, 03:40 AM Go to last post
  19. moment generating function

    Hi I have a question here: Let X be N(µ, Σ) obtain its moment generating function anyone know how to do it?? it really confused me !! ...

    Started by smallkai‎, 08-08-2008 12:35 AM
    • Replies: 1
    • Views: 2,928
    08-08-2008, 01:08 AM Go to last post
  20. Luck vs. Skill Question

    Hi, I am reading the book "Fooled By Randomness" by Nassim Nicholas Taleb and ran into what I think is a statistics/probability question. In the book...

    Started by uni412‎, 08-07-2008 01:43 PM
    • Replies: 1
    • Views: 3,061
    08-07-2008, 02:06 PM Go to last post
  21. Estimating Sports Statistics

    I need some help with football application. I have a set of quarterback statistics projections for an entire season (16 games), including the players...

    Started by vsiddhartha‎, 08-07-2008 10:43 AM
    • Replies: 2
    • Views: 2,711
    08-07-2008, 01:56 PM Go to last post
  22. Poisson/Binomial distribution help

    Hi everyone I'm enrolled in a first year intro stats paper at uni and am having difficulty solving questions on proportions using binomial or...

    Started by Silvanus‎, 08-05-2008 06:03 PM
    • Replies: 6
    • Views: 3,637
    08-06-2008, 04:59 PM Go to last post
  23. Movement in Consumer Choice / Markov Chain??

    I'm trying to determine a way to model the choice behavior of a group of individuals whose choices are based on a 5-point scale (i.e. they can select...

    Started by Crystal‎, 08-06-2008 03:39 PM
    • Replies: 1
    • Views: 2,370
    08-06-2008, 04:03 PM Go to last post
  24. Is there enough information here to solve this problem?

    I'm not sure if I should be posting this under statistics or probability, but here's the problem: Jan did a survey of the students in her class in...

    Started by Joy‎, 08-06-2008 11:30 AM
    • Replies: 3
    • Views: 2,780
    08-06-2008, 12:40 PM Go to last post
  25. Probability that 53% of College Students graduate in 5 years or less

    Good Afternoon, I am working on a problem and got stuck. The problem is below: It is estimated that approximatly 53% of College Students graduate...

    Started by pjkaraffa‎, 08-05-2008 01:58 PM
    • Replies: 2
    • Views: 4,061
    08-05-2008, 06:46 PM Go to last post
  26. p-value to compare agreement between 2 methods

    I have 2 methods which, given a list of variables, put these variables into an order. So imagine I have 20 possible variables,...

    Started by tastico‎, 08-04-2008 08:07 AM
    • Replies: 2
    • Views: 4,927
    08-04-2008, 12:51 PM Go to last post
  27. finding value of z0

    P(|z| > z0) = 0.10 Find z0. I think the answer is z0 = 1.28, however I'm not sure how to get that. The first time I did it, I got 1.645,...

    Started by toronto416‎, 08-04-2008 11:39 AM
    • Replies: 1
    • Views: 23,588
    08-04-2008, 11:55 AM Go to last post
  28. Red face Bayes Theorem application

    Prior probabilities if diseases are based on the physician’s assessment of factors such as geographic location, seasonal influences, and occurrence...

    Started by ana_talkstats‎, 08-01-2008 02:39 PM
    • Replies: 1
    • Views: 4,952
    08-03-2008, 12:55 PM Go to last post
  29. Joint/Marginal PDF question

    OK, I have this problem on my hw I am struggling through. Random vector (X,Y) has the joint pdf f(x,y) = c(x^2+y^2), for x^2+y^2<1, and = 0...

    Started by kditrag‎, 07-28-2008 11:58 AM
    • Replies: 1
    • Views: 4,785
    07-31-2008, 04:33 PM Go to last post
  30. I think this is binomial???

    I was wondering if anyone can solve this problem and let me know how they did it. I am thinking this is a binomial problem, but I haven't been able...

    Started by anemro‎, 07-28-2008 09:14 PM
    • Replies: 2
    • Views: 2,685
    07-30-2008, 09:34 PM Go to last post
  31. Conditional Probability

    I was hoping someone could shine some light on how to go about solving this question.... A dog has a litter of four pups. Assume, as usual, that...

    Started by anemro‎, 07-27-2008 02:25 PM
    • Replies: 1
    • Views: 2,100
    07-27-2008, 03:18 PM Go to last post
  32. An Unusual Probability Question

    Hello everyone, I wonder if anyone would be willing to help me in deciding whether an unusual array of numbers I've found within the NIV Bible is...

    Started by thebluetriangle‎, 07-24-2008 09:44 AM
    • Replies: 0
    • Views: 2,954
    07-24-2008, 09:44 AM Go to last post
  33. probability of 'wrong-direction' pair

    Hello! I have two normal distributions N1, N2 with means m1, m2 and standard deviations s1, s2. Let's say that m1 < m2. If I draw one observation...

    Started by dej76‎, 07-20-2008 11:02 AM
    • Replies: 3
    • Views: 2,270
    07-23-2008, 07:47 PM Go to last post
  34. Stats question.

    Part 1. In how many ways can a television director schedule a sponsor's six different commercials during the six time slots allocated to commercials...

    Started by bjc-8000‎, 07-23-2008 02:56 PM
    • Replies: 1
    • Views: 3,094
    07-23-2008, 07:37 PM Go to last post
  35. Hello, i need an answer to this probability problem. please help?

    A teenager is mugged in the city centre for his expensive, size 9, trainers by a white man. A white suspect from the same city is arrested wearing a...

    Started by greg24‎, 07-23-2008 10:27 AM
    • Replies: 0
    • Views: 2,031
    07-23-2008, 10:27 AM Go to last post
  36. What is the process spread ?

    Here's the question: Fifty measurements were taken to determine the weights of filled ice cream containers. The average of these measurements is...

    Started by greyghost‎, 07-23-2008 06:47 AM
    • Replies: 2
    • Views: 11,816
    07-23-2008, 07:12 AM Go to last post
  37. P- value

    Hi. Could a p-value be 5.7597? It seems too big!!!

    Started by kendra‎, 07-21-2008 10:16 PM
    • Replies: 1
    • Views: 2,681
    07-21-2008, 10:45 PM Go to last post
  38. Help with coins!!!

    Hi.. I don't know how to get started. Here is my problem: A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of...

    Started by kendra‎, 07-21-2008 02:12 PM
    • Replies: 2
    • Views: 3,278
    07-21-2008, 09:22 PM Go to last post
  39. Help!

    Hi.. I am confused about how to solve this problem. I believe I should solve it by using the proportion formula but my results do not match my...

    Started by kendra‎, 07-20-2008 11:49 PM
    • Replies: 5
    • Views: 2,640
    07-21-2008, 02:11 PM Go to last post
  40. How to solve this problem?

    HI, i get stuck on this problem, any1 knows how to solve it??? Horizontal lines y = n (n = 0, +-1,...) are drawn in R^2. A needle of length 1 is...

    Started by kickking2003‎, 07-20-2008 10:13 AM
    • Replies: 1
    • Views: 2,458
    07-20-2008, 10:38 AM Go to last post
  41. Need help in finding the probability of events occuring?

    Question: i have a total of 16 events whereby the probability of 2 events occuring is 0.3, the probability of 6 events occuring is 0.003 and the...

    Started by spidermman‎, 07-19-2008 04:10 AM
    • Replies: 6
    • Views: 5,523
    07-20-2008, 01:38 AM Go to last post
  42. Problem help needed

    Does anyone know how to solve the following problem: i)Toss a coin until the nth H comes up. Let Y=#of required tosses. Calculate P(Y is even)....

    Started by y2knp‎, 07-19-2008 05:52 PM
    • Replies: 0
    • Views: 1,753
    07-19-2008, 05:52 PM Go to last post
  43. Confidense interval for population standard deviation

    Here is one I am stuck on...not even sure where to begin. Oh, and it is due in 19 hours ;-) A bank is attempting to improve the perceived customer...

    Started by DryMouse‎, 07-15-2008 10:48 PM
    • Replies: 2
    • Views: 3,869
    07-18-2008, 02:24 PM Go to last post
  44. Comparing conditional probabilities?

    I have 250 respondents. They’ve reported their participation in three different kinds of political activities: reading about politics on line,...

    Started by DDN1972‎, 07-17-2008 07:08 PM
    • Replies: 2
    • Views: 2,881
    07-17-2008, 08:22 PM Go to last post
  45. Question Need Help Understanding Independence

    Unfortunately, I am having trouble understanding independence. Can anyone explain independence to me in dummy terms?

    Started by Prob_help‎, 07-16-2008 12:32 PM
    • Replies: 2
    • Views: 3,371
    07-17-2008, 04:08 AM Go to last post
  46. Question Help with finding indicated probability

    I have worked on this problem now for the whole entire day, and still don't understand what I am doing wrong. Can someone help me? The problem...

    Started by teneclady201‎, 07-10-2008 05:40 PM
    • Replies: 4
    • Views: 29,052
    07-13-2008, 06:04 PM Go to last post
  47. Probability of Amino Acid Sequence

    I need to predict the frequency of a certain chain of amino acids occurring by chance. Sequence: N - X - S (where X is any amino acid) So far...

    Started by welshchem‎, 07-10-2008 02:03 PM
    • Replies: 2
    • Views: 2,936
    07-11-2008, 08:41 AM Go to last post
  48. Comparing CDFs using Chi squared?

    HI, I have a set of data from which I can construct the cumulative distribution function. I then compare this contructed CDF with the CDFs of a...

    Started by aler‎, 07-09-2008 11:45 AM
    • Replies: 3
    • Views: 4,632
    07-10-2008, 07:44 AM Go to last post
  49. Sample mean and variance of dependent random variables

    The sample mean and variance of independent random variables are mean = E(X) variance = Var(X)/n What if the random variables are dependent? ...

    Started by shrek‎, 07-09-2008 01:41 PM
    • Replies: 1
    • Views: 13,447
    07-10-2008, 03:57 AM Go to last post
  50. probability of exceedence

    Hi all, I'm new here, but I have a problem I can't figure out. I have wave height data from the past 13 years and I fitted the data with a...

    Started by zuid‎, 07-07-2008 09:42 AM
    • Replies: 0
    • Views: 3,111
    07-07-2008, 09:42 AM Go to last post
  51. probabilities

    I am german and I have some difficulties understanding some terms. I have a homework in reference to probabilities. Please help me with the formula....

    Started by umutc23‎, 07-04-2008 08:26 PM
    • Replies: 3
    • Views: 2,707
    07-06-2008, 06:02 PM Go to last post
  52. Can increased promiscuity decrease STD risk? Part I.

    My brother mentioned a book he had read and enjoyed. In it, a chapter was devoted to the idea that "More 'Secks' is Safer 'Secks'". An abridged...

    Started by gobirthright‎, 07-04-2008 01:04 PM
    • Replies: 0
    • Views: 2,842
    07-04-2008, 01:04 PM Go to last post
  53. Need help

    I have little idea of probability. I am programming a tool in C where I use random 64 bit numbers. Many people call rand() function of C library four...

    Started by Fermin‎, 07-02-2008 06:15 AM
    • Replies: 3
    • Views: 2,277
    07-03-2008, 03:30 AM Go to last post
  54. Probability - Multiplication/addition rules?

    I have been working on this problem and have come up with answers, but I have a feeling they are wrong...Hoping people much more intelligent in...

    Started by DryMouse‎, 07-01-2008 12:44 AM
    • Replies: 6
    • Views: 4,733
    07-01-2008, 11:16 PM Go to last post
  55. nonstandard normal distributions

    I am working a problem regarding IQ scores and am having trouble with one of the problems. I've got it figured out how to work other problems but...

    Started by jlpickett‎, 07-01-2008 06:53 PM
    • Replies: 5
    • Views: 21,177
    07-01-2008, 10:15 PM Go to last post
  56. Probability Problems! Help! Thanks

    Recently bar codes put on retail products were changed so that they would represent 14 digits instead of 12. How many different products can now be...

    Started by dctan12‎, 07-01-2008 12:45 AM
    • Replies: 1
    • Views: 3,505
    07-01-2008, 07:44 AM Go to last post
  57. Beginner for Probability

    I'm taking a statistics class that's covering probability. I'm having problems with some of my homework. I was hoping somebody could tell me what...

    Started by spum‎, 06-30-2008 09:03 PM
    • Replies: 0
    • Views: 3,253
    06-30-2008, 09:03 PM Go to last post
  58. Defects

    I would like to see how I can solve this problem effectively. Thanks for your help in advance. x= no of defects P(x) = prob of defects x ...

    Started by kobebryant‎, 06-22-2008 05:21 PM
    • Replies: 1
    • Views: 2,296
    06-30-2008, 03:49 PM Go to last post
  59. Normal probability question (tough one I think)

    What is the probability that a randomly selected sample mean of n=100 will be greater than a randomly selected sample mean of n=1000? I'm not sure...

    Started by Delacroix‎, 06-27-2008 11:25 AM
    • Replies: 2
    • Views: 2,319
    06-27-2008, 01:33 PM Go to last post
  60. Sampling to figure most common color in M&M packet

    Please disregard this post. I did not realize that my earlier post was moved over to the Stats section.

    Started by musicgold‎, 06-27-2008 12:55 PM
    • Replies: 0
    • Views: 3,469
    06-27-2008, 12:55 PM Go to last post

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