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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: 30,168
    09-30-2005, 09:44 AM Go to last post
  1. Video game equipment

    Hello everyone, My friend has been playing this game called Tabula Rasa, and is trying to make the perfect armor for his character. In order to do...

    Started by chriscj‎, 05-14-2008 03:15 AM
    • Replies: 5
    • Views: 4,568
    05-30-2008, 12:00 AM Go to last post
  2. Probability

    Question. Need help Please The accounting department at Weston Materials, Inc., a national manufacturer of unattached garages, reports that it...

    Started by Slick‎, 05-14-2008 06:31 AM
    • Replies: 5
    • Views: 3,724
    06-07-2008, 07:31 AM Go to last post
  3. Unhappy Probability and Moment Generating Functions

    Hello, I am terrible when it comes to probability and moment generating functions. I missed 2 lectures this week and I am now completely lost on...

    Started by arguabsysi‎, 05-22-2008 05:16 AM
    • Replies: 5
    • Views: 3,580
    05-22-2008, 02:43 PM Go to last post
  4. Probability Question

    Hello, I need help figuring out the results which are based on probability percentages. Let’s say there’s an item which you can brake down into...

    Started by dpg‎, 05-26-2008 12:17 PM
    • Replies: 5
    • Views: 2,662
    05-31-2008, 11:32 AM Go to last post
  5. sampling normal distributions

    Hello everyone, I'm a new member to the forum and just wanted to introduce myself. I also have been trying to figure out a homework question, and am...

    Started by toronto416‎, 06-19-2008 11:34 AM
    • Replies: 5
    • Views: 4,264
    06-20-2008, 12:25 PM Go to last post
  6. 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: 21,004
    07-01-2008, 10:15 PM Go to last post
  7. 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: 2,625
    07-21-2008, 02:11 PM Go to last post
  8. Red face Stats probability

    A bag initially contained 4 white marbles and 9 black marbles. A marble was drawn and replaced by 2 marbles.. of the opposite colour.. Then...

    Started by Janiffer‎, 08-29-2008 02:52 AM
    • Replies: 5
    • Views: 3,806
    09-02-2008, 09:25 AM Go to last post
  9. probability help pugowner

    14. A study was made to determine the calories, total fat content and sodium in 54 brands of “veggie” burgers as shown below. < 130...

    Started by pugowner‎, 10-03-2008 09:40 PM
    • Replies: 5
    • Views: 2,413
    10-04-2008, 05:06 PM Go to last post
  10. a defective probability problem

    I am trying real hard on solving this problem: A sample of 4 different cell phones is randomly selected from a group containing 15 that are...

    Started by carsont89‎, 10-27-2008 03:34 PM
    • Replies: 5
    • Views: 3,052
    10-28-2008, 08:47 AM Go to last post
  11. Weird Probability Problem

    Hi, I'm having trouble with a problem assigned by my teacher that reads: "Assume that you are boarding a flight in which there are five seats and...

    Started by Addlift‎, 10-28-2008 10:14 PM
    • Replies: 5
    • Views: 6,389
    11-01-2008, 03:49 PM Go to last post
  12. Selecting K numbers from N=10^L where group of same prefix exists

    Hello all, I cannot solve following problem. Lets have a phone numbers of the length L. Number of phone numbers is N=10^L. What is the...

    Started by ieee‎, 10-29-2008 07:59 AM
    • Replies: 5
    • Views: 2,747
    10-30-2008, 01:04 PM Go to last post
  13. Please help with computing expectation!

    I have trouble with the following two questions concerning expectations, can anyone give me a hint? Question 1) Suppose there are k=10 types of...

    Started by yellowrose2011‎, 11-11-2008 01:43 PM
    • Replies: 5
    • Views: 3,866
    11-13-2008, 03:15 PM Go to last post
  14. uniform distribution

    A bus travels between Glasgow and Edinburgh, which we suppose are 78km apart. If the bus has a breakdown, the distance from breakdown to Glasgow has...

    Started by xixihaha‎, 11-25-2008 06:00 PM
    • Replies: 5
    • Views: 4,863
    11-26-2008, 09:27 AM Go to last post
  15. Match odds versus overall odds of winning in horse racing

    The problem I have is as follows. Take a horse race with multiple entrants. Assume that I can accurately assess the probability of horse X...

    Started by Onionman‎, 12-04-2008 11:29 AM
    • Replies: 5
    • Views: 10,253
    12-10-2008, 02:44 PM Go to last post
  16. Chebyshev's theorem and empirical rule

    can someone please explain how to do this problem? I am so confused! Assume the distribution of weights of US adults are normally distributed...

    Started by vintageglam09‎, 12-09-2008 02:20 AM
    • Replies: 5
    • Views: 11,029
    12-10-2008, 02:04 PM Go to last post
  17. bayesian

    I had a question about the bayesian estimator. My question comes directly from a wikipedia page on the subject. ...

    Started by bres6486‎, 01-08-2009 03:20 PM
    • Replies: 5
    • Views: 3,242
    01-16-2009, 12:52 AM Go to last post
  18. a short one

    Hi guys, I'm new to this forum, and perhaps there already exist an answer to this question. Anyway here I go, I have an assignment in...

    Started by dhl‎, 02-07-2009 01:45 PM
    • Replies: 5
    • Views: 2,388
    02-09-2009, 08:01 PM Go to last post
  19. can you get probability simply from a percentage?

    I have this problem I'm trying to figure out regarding discrete probability distributions. If I have a percentage of either successful or failed...

    Started by Joia‎, 02-14-2009 05:35 PM
    • Replies: 5
    • Views: 4,335
    02-14-2009, 10:50 PM Go to last post
  20. Exclamation Urgent Help!!

    Good Evening everyone! I am looking for some urgent help on the following questions, so any input would be greatly appreciated. #1. It was...

    Started by Quattro9116‎, 02-17-2009 05:54 PM
    • Replies: 5
    • Views: 2,036
    02-19-2009, 09:38 AM Go to last post
  21. Binomial

    The proportion of individuals who favor Party A in the population is 55%. How large must a sample be in order to ensure that 99% of the sample favors...

    Started by jamesmartinn‎, 02-19-2009 12:56 AM
    • Replies: 5
    • Views: 2,961
    02-19-2009, 05:40 PM Go to last post
  22. Calculating probability of a given student major

    First off, this is a homework question. I am completely stuck on this problem and am not sure how to answer the question. We are given a table of...

    Started by hackman2007‎, 02-19-2009 08:23 PM
    • Replies: 5
    • Views: 3,232
    02-21-2009, 09:12 PM Go to last post
  23. Unhappy Probabilities...need help fast

    i DONT UNDERSTAND THIS QUESTION.. I MEAN HOW DO I SET THIS UP.. PLEASE HELP ME.. QUESTION.. THE 10YR SURVIVAL RATE FOR BLADDER CANER IS APROX....

    Started by SUNSHINE09‎, 02-23-2009 09:55 AM
    • Replies: 5
    • Views: 2,135
    02-23-2009, 01:12 PM Go to last post
  24. Probabilistic Independence

    Hi, First time poster. Hopefully I won't break any rules. I'm sure you will let me know if I did. Question: Suppose that two dice are tossed....

    Started by urfriend‎, 02-24-2009 10:34 PM
    • Replies: 5
    • Views: 2,568
    02-25-2009, 06:35 AM Go to last post
  25. Question Homework help

    Hello. I have a minor set back on my homework. So I have a homework problem which states find the probability of the indicated event if...

    Started by LeslieF‎, 02-26-2009 11:14 AM
    • Replies: 5
    • Views: 19,068
    02-26-2009, 11:15 PM Go to last post
  26. Mr

    Need to simultaneneously compare child-woman ratios of two censuses presented in 2 (4*7) tables;4 educational categories and 7 age-groups. Any...

    Started by MAYSAL‎, 03-31-2009 06:04 PM
    • Replies: 5
    • Views: 2,379
    04-01-2009, 04:56 PM Go to last post
  27. Probability Functions - Need Help

    I need help with a question that involves Calculus. I've been out of school for 12 years and now have jumped back into a stat class with a some...

    Started by schnakees‎, 06-11-2009 01:04 PM
    • Replies: 5
    • Views: 2,159
    06-11-2009, 10:33 PM Go to last post
  28. Probability that one group of successes will be greater than another

    So, I'm working on this big old nerdy project, but I haven't got much of a head for statistics. I was wondering if someone would be able to help me....

    Started by heavyarms553‎, 06-12-2009 09:48 PM
    • Replies: 5
    • Views: 4,688
    08-26-2009, 11:34 AM Go to last post
  29. Binomial random variable question

    I have this question that is driving me batty & I cannot figure it out. I'm taking entry level stats online & have driven to the campus a few times...

    Started by disgurl‎, 06-16-2009 11:26 AM
    • Replies: 5
    • Views: 5,322
    06-16-2009, 09:34 PM Go to last post
  30. Baye's Theorem Urn Problem

    Hi, I am having some trouble with this problem: Suppose there are 3 urns. You choose one from which you will choose 2 balls from. Urn 1 has 4 red...

    Started by mobius0‎, 07-09-2009 10:17 PM
    • Replies: 5
    • Views: 5,316
    07-11-2009, 10:44 AM Go to last post
  31. E(X) < ∞ ? What does it mean?

    Let X and Y be random variables, F be a function. I have seen in a variety of contexts that they write "E(X) < ∞". What does it mean? My guess is...

    Started by kingwinner‎, 07-14-2009 11:49 PM
    • Replies: 5
    • Views: 16,840
    07-15-2009, 05:30 PM Go to last post
  32. Can ANYONE solve this??????

    I am trying to figure out the method I should use to find the probability of picking any rank of cards (Ace through Deuce) from a standard deck of 52...

    Started by DCtheplace2b‎, 07-18-2009 12:14 PM
    • Replies: 5
    • Views: 3,018
    07-20-2009, 01:15 PM Go to last post
  33. Standard Deviation

    Is it possible to calculate the mean and standard deviation of a normal distributed source population when only a few sample means (of non equal...

    Started by Alexander‎, 07-28-2009 03:48 PM
    • Replies: 5
    • Views: 2,743
    07-31-2009, 10:24 AM Go to last post
  34. Binary Bootstrap

    Is it valid to use a bootstrap technique for estimating variance in a binary (yes/no or 1/0) data set? My motivation for doing so is to perform...

    Started by cmonke‎, 08-15-2009 02:57 PM
    • Replies: 5
    • Views: 7,373
    09-29-2009, 04:01 AM Go to last post
  35. Distribution and Laplace Transform

    Consider a game in which a fair coin is tossed indefinitely. Every time heads appears you move 1 metre to the right, and if tails you stay where you...

    Started by woody198403‎, 08-15-2009 09:18 PM
    • Replies: 5
    • Views: 7,279
    08-16-2009, 05:43 AM Go to last post
  36. Proof of Cheybshev Inequality

    Cheybshev's inequality states that if X is a random variable that has finite variance ((sigma^2)) and expectation (mu) then P(|X - (mu)| >=...

    Started by woody198403‎, 08-15-2009 10:03 PM
    • Replies: 5
    • Views: 2,575
    08-16-2009, 05:29 AM Go to last post
  37. Stuck again. Please advice.

    Question: A coffee company distributes boxes of coffee with a mixture of dark, light and roast. Suppose that the weight of each box is 1 kilogram,...

    Started by canon14‎, 08-25-2009 09:36 PM
    • Replies: 5
    • Views: 2,006
    08-27-2009, 06:59 AM Go to last post
  38. Process capability without variability in data?

    My company uses Cpk to judge process capability, with a 1.33 Cpk being the acceptable minimum for most processes. In some cases, we do not have...

    Started by Dannyboy175‎, 09-09-2009 01:34 PM
    • Replies: 5
    • Views: 7,323
    09-11-2009, 06:41 AM Go to last post
  39. Birthday Problem

    Can anyone help me with these questions? I am new in probability and i even don't know where to start..:( (1)What is the minimum number of people...

    Started by sanjitpatel2004‎, 09-19-2009 10:46 AM
    • Replies: 5
    • Views: 3,746
    09-20-2009, 04:57 PM Go to last post
  40. confused by normal distributions with variance smaller than 1

    Hello, I am currently working with some normal distributions, and got confused by some specific situation where the density function does not look...

    Started by nightlordtw‎, 10-27-2009 10:56 AM
    • Replies: 5
    • Views: 6,665
    10-29-2009, 05:30 AM Go to last post
  41. Question Yes/No Survey mean?

    This is the questions I know how to do it but I dont know how I would figure out the mean for this, which is needed to find the confidence level. ...

    Started by rajuthan‎, 11-04-2009 12:03 AM
    • Replies: 5
    • Views: 11,753
    02-03-2010, 12:44 AM Go to last post
  42. Conditioning on Random Variables?

    Let T be a constant, and let N be a random variable. Suppose {X_1,X_2,...} are independent, and each X_i follows continuous uniform(0,T)...

    Started by kingwinner‎, 11-15-2009 10:38 PM
    • Replies: 5
    • Views: 3,327
    11-17-2009, 10:50 PM Go to last post
  43. Need Help With Joint Density Problem Please!

    I got the problem

    Started by Porter1‎, 11-25-2009 09:15 PM
    • Replies: 5
    • Views: 4,274
    11-26-2009, 10:35 AM Go to last post
  44. Poisson Question

    Got a question here about an antenna designed to withstand 50mph wind ( 20m abover ground) the 50mph wind occurs once every 30 years on average. What...

    Started by Yvonne M‎, 01-10-2010 11:40 AM
    • Replies: 5
    • Views: 2,677
    01-10-2010, 03:50 PM Go to last post
  45. Fairly Easy Question - Poisson Distribution

    My first post! Anyway I just need a bit of help with a question that I've come across in a textbook which is as follows: Cars arrive at a toll...

    Started by OToole‎, 02-11-2010 02:50 AM
    • Replies: 5
    • Views: 7,367
    02-11-2010, 10:48 PM Go to last post
  46. least squares

    Hi there, The least squares equations are g1=Σ(y-μ)=0 g2=Σx(y-μ)=0 where μ is b0+b1*x. g1 and g2 take a specific value for each pair of...

    Started by leo nidas‎, 03-23-2010 04:16 AM
    • Replies: 5
    • Views: 3,514
    04-20-2010, 09:34 AM Go to last post
  47. Probaility of one random value being bigger than the other?

    Hi all! Intuition was telling me that probability of one random value being bigger than the other (both values are sampled from same distribution...

    Started by Maverick85‎, 04-14-2010 06:24 AM
    • Replies: 5
    • Views: 3,342
    04-14-2010, 11:01 PM Go to last post
  48. 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: 4,498
    07-04-2010, 10:12 AM Go to last post
  49. why should the I use a t distribution? (theory question)

    Hello I would like some help with the theory behind the t-test. I know how to technically perform a t-test but something in the logic doesn't add...

    Started by gargy‎, 05-19-2010 05:44 AM
    • Replies: 5
    • Views: 7,318
    05-19-2010, 01:15 PM Go to last post
  50. 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: 5,392
    06-10-2010, 10:30 PM Go to last post
  51. 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: 2,547
    06-21-2010, 10:33 PM Go to last post
  52. 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: 2,953
    07-02-2010, 12:02 AM Go to last post
  53. 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: 3,148
    07-02-2010, 10:45 PM Go to last post
  54. A probability question

    a stick of length 1 is cut twice randomly, probability that 3 segments can form a triangle? x,y, 1-x-y x+y>1-x-y ==> x+y>1/2 1-x-y+x>y ==>...

    Started by tennis89‎, 07-09-2010 02:17 PM
    • Replies: 5
    • Views: 3,266
    07-16-2010, 12:01 PM Go to last post
  55. Conditional Probability

    What is the chance that the seventh card from the top of the deck will be a heart? This question really stumped me. I thought and then divided by...

    Started by Luis Felipe‎, 07-11-2010 10:31 AM
    • Replies: 5
    • Views: 4,569
    07-11-2010, 02:49 PM Go to last post
  56. testing hypotheses

    Out of an i.i.d sample, with N = 200, and a sample mean of 7000 and sample variance of 700, how would you answer the following question, At 5%...

    Started by messianic‎, 07-14-2010 01:14 PM
    • Replies: 5
    • Views: 3,269
    07-14-2010, 05:20 PM Go to last post
  57. Uniform Continuous Probability

    Hi all, The question i have has these givens: t = years f(t) = 10(1-5t) for 0=< t =< 1/5 a) What is probability that a machine will last...

    Started by c2q‎, 07-19-2010 09:02 PM
    • Replies: 5
    • Views: 5,148
    07-19-2010, 11:18 PM Go to last post
  58. equip. failure

    A widget fails each month for six months. A fix is then installed. How many months of no failures would need to go by before I can be 95%...

    Started by Outlier‎, 07-22-2010 12:39 PM
    • Replies: 5
    • Views: 3,133
    07-23-2010, 10:52 AM Go to last post
  59. probability ques.

    a publishing company holds a sales contest in which the top 6 performers out of 97 sales reps receive prizes ranging from a trip to ireland for the...

    Started by yohy20‎, 07-27-2010 10:05 PM
    • Replies: 5
    • Views: 2,466
    08-04-2010, 01:32 PM Go to last post
  60. Chance level binomial, not 1/n

    I have some data which I am going to performed a mixed ANOVA on, however, I think I might need to transform the raw data, but am not sure how to. ...

    Started by thisisnic‎, 08-07-2010 11:24 AM
    • Replies: 5
    • Views: 3,910
    08-10-2010, 09:43 AM Go to last post

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