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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: 31,144
    09-30-2005, 09:44 AM Go to last post
  1. Expected Value and Fair Value clarification (work already done)

    4. In the lottery game FANTASY 5 you have to select 5 numbers from the numbers {1,2,3,... ,38,39} for a jackpot of $40,000. Each ticket costs $1. In...

    Started by JohnWayne‎, 10-08-2013 04:54 PM
    • Replies: 2
    • Views: 2,596
    10-08-2013, 10:10 PM Go to last post
  2. Difference powerlaw, lognormal and streteched exponential (Weibull) function

    I am currently fitting above mentioned functions to my data and I can observe, that both lognormal and Weibull are better fits than powerlaw. In...

    Started by killver‎, 10-08-2013 05:42 AM
    distribution, lognormal, powerlaw, weibull
    • Replies: 2
    • Views: 2,959
    10-08-2013, 07:40 AM Go to last post
  3. Variance and the second moment

    Need some help understanding some basic concepts. I understand the first moment of a distribution as being a central point about which the...

    Started by Prometheus‎, 10-05-2013 05:28 PM
    var(x)=e[x^2] - e[x]^2
    • Replies: 2
    • Views: 4,313
    10-08-2013, 06:11 AM Go to last post
  4. Question How to generate two random vectors correlated to three existing vectors

    Let's have three vectors that are given and cannot change (M, N and O). I have to generate two random vectors X and Y. The correlation that has to be...

    Started by Lubomir‎, 10-07-2013 03:23 AM
    correlated random numbers, random numbers
    • Replies: 3
    • Views: 2,078
    10-08-2013, 04:13 AM Go to last post
  5. Help with cdf

    I'm having trouble with grasping cdf's. If I have a cumulative distribution function F(x) = .0 ----- x<-2 ...

    Started by bigbob‎, 10-06-2013 04:53 PM
    cdf, cdf technique
    • Replies: 5
    • Views: 1,782
    10-07-2013, 12:12 PM Go to last post
  6. Symmetry of Cumulative St. Normal Function

    Hi all, I have to show that for the normal distribution F(z)=1-F(-z), starting with the integral: \displaystyle F(z)=\int_{-\infty} ^z...

    Started by JohnK‎, 10-07-2013 07:06 AM
    • Replies: 2
    • Views: 1,595
    10-07-2013, 07:39 AM Go to last post
  7. Gamma Distribution and data fitting

    I have a problem with data fitting to gamma distribution. I have rainfall occurrences (calculated using 1st order 2 states Markov Chain analysis) for...

    Started by zhouy‎, 10-07-2013 12:13 AM
    gamma distribution, markov chain, maximum likelihood, rainfall probability
    • Replies: 0
    • Views: 1,875
    10-07-2013, 12:13 AM Go to last post
  8. Difference between p(y=0|x=0) and p(x=0,y=0)

    Another Trivial question: I have been asked to calculate the joint probability i.e. p(X=0,Y=0) and i have been provided by P(Y=0|X=0), is it the...

    Started by Yashodhar.rao‎, 10-06-2013 01:15 PM
    conditional probability, joint probability
    • Replies: 1
    • Views: 1,712
    10-06-2013, 10:18 PM Go to last post
  9. Probability question

    This is a problem from the book Statistics for Experimenters by Box, Hunter, Box book, page 151. For each sample of 16 boxes of cereal an average...

    Started by svs‎, 04-05-2013 07:40 PM
    • Replies: 3
    • Views: 1,928
    10-06-2013, 08:59 PM Go to last post
  10. Mean of Current I with Random variable of R

    Hi all, I am new to probability and not so good at it, So please bear with me :) If a voltage e is connected across a resistor whose...

    Started by Yashodhar.rao‎, 10-05-2013 04:20 PM
    current, estimate, probability distribution, resistor
    • Replies: 2
    • Views: 1,609
    10-06-2013, 06:03 AM Go to last post
  11. Probabilities associated with simple events

    An experiment can result in one of five equally likely simple events, E1, E2..... E5. Events A, B and C are defined as follows. A: E1, E3 ...

    Started by dave08‎, 10-05-2013 08:50 AM
    • Replies: 0
    • Views: 1,719
    10-05-2013, 08:50 AM Go to last post
  12. Need help with joint distribution problems

    1. You need $30,000. Suppose that there is a 20% chance that Bank of America will loan you $30,000, a 30% chance that Wells Fargo will loan you...

    Started by JohnWayne‎, 10-04-2013 06:19 AM
    • Replies: 2
    • Views: 1,438
    10-04-2013, 12:13 PM Go to last post
  13. Probability (Combination??)

    1(a). In a group of 15 students, 9 are boys and 6 are girls. (i). On Sunday, you randomly select 12 students without replacement, what is the...

    Started by well‎, 10-03-2013 11:19 AM
    • Replies: 1
    • Views: 1,833
    10-03-2013, 05:38 PM Go to last post
  14. What is joint probability of these events?

    We have two events A and B and three locations X, Y, Z. Each event A and B is carried independently on locations X, Y, Z. The individual probability...

    Started by MMBaig‎, 10-03-2013 08:31 AM
    joint probability
    • Replies: 0
    • Views: 3,808
    10-03-2013, 08:31 AM Go to last post
  15. How to calculate the area in buffon needle problem?

    i am confused to compute the area in buffon needle problem, 1.could you tell me which coordinate to choose ? polar coordinate or cartesian...

    Started by luofeiyu‎, 10-02-2013 09:00 PM
    • Replies: 2
    • Views: 2,368
    10-03-2013, 03:20 AM Go to last post
  16. Several True and False Questions!

    1. DeMorgan's law states the following: P(A or B)' = P(A' and B') 2. If two events are mutually exclusive then they must be independent. 3. A...

    Started by USA2013‎, 10-02-2013 11:25 PM
    • Replies: 0
    • Views: 984
    10-02-2013, 11:25 PM Go to last post
  17. Probability of hitting a target

    I've been trying to work out the probability of hitting a spot in the center of a target and running into some snags. The problem is this: ...

    Started by ragnarocc‎, 10-02-2013 02:08 PM
    • Replies: 0
    • Views: 2,273
    10-02-2013, 02:08 PM Go to last post
  18. Bounded in Probability proof

    Hi all, I could use some help understanding the following proof so please feel free to pitch in! Consider any random variable X with...

    Started by JohnK‎, 10-01-2013 06:51 PM
    • Replies: 5
    • Views: 4,933
    10-02-2013, 11:32 AM Go to last post
  19. finding probabilty

    Consider a country in which 100, 000 people vote in an election. There are only two candidates on the ballot; a Democratic candidate (denoted D) and...

    Started by arun_jj‎, 10-01-2013 11:34 PM
    probabilty
    • Replies: 3
    • Views: 1,999
    10-02-2013, 12:46 AM Go to last post
  20. Question Help with Sample Space question.

    Q: There are n marbles in a bag and k(k<n) of these marbles are marked. i) Marbles are drawn from the bag at random (without replacement) until one...

    Started by stilgar‎, 09-30-2013 01:48 AM
    problem, sample, space
    • Replies: 2
    • Views: 1,530
    10-01-2013, 12:06 PM Go to last post
  21. Poisson Distribution Help

    Hey, I need some help with the following exercise (big test on Sunday). Q: A lab researching cancer cells found that transformed epithelial...

    Started by HadasL‎, 10-01-2013 10:00 AM
    • Replies: 11
    • Views: 2,332
    10-01-2013, 11:33 AM Go to last post
  22. Counting Question

    Question: If I had X number of train cars and I wanted to know the probability of having Y or more people in a car when I have N total of people. How...

    Started by Toonzaka‎, 09-30-2013 04:11 AM
    • Replies: 1
    • Views: 1,349
    09-30-2013, 06:47 AM Go to last post
  23. Need Help

    If anyone can take a look at these two problems and see my answers and let me know if I did it correct or am doing it wrong it would be greatly...

    Started by bigbob‎, 09-29-2013 04:56 PM
    • Replies: 6
    • Views: 3,153
    09-29-2013, 07:27 PM Go to last post
  24. Post this is tricky, have to solve it. come on everyone lets think and try fr possible sol

    1. An experiment is conducted repeatedly. At each trial the outcome is either failure or success. The outcome of each trial is independent of all...

    Started by mathatwork‎, 09-29-2013 03:20 PM
    • Replies: 1
    • Views: 1,802
    09-29-2013, 05:49 PM Go to last post
  25. binomial distribution help / confirmation

    Q: A manufacturer produces 1000 computer chips for a mission-critical application. Each chip costs $100 to manufacture and sells for $2000, but has...

    Started by mal100‎, 09-19-2013 12:03 AM
    • Replies: 1
    • Views: 3,247
    09-29-2013, 05:01 PM Go to last post
  26. Probability Question from Frederick Mosteller, #7

    Hey all, I'm trying to improve my probability skills so hopefully the questions I'm asking aren't too amateur-ish. The following is a question...

    Started by barrelbowl‎, 09-25-2013 07:18 PM
    • Replies: 1
    • Views: 2,094
    09-27-2013, 01:01 PM Go to last post
  27. HELP! probability that a 7 digit number is divisible by 7?

    The seven digits {1; 2; 3; 4; 5; 6; 7} are written down in a random order. What is the chance that the resulting number is divisible by 7? For...

    Started by lincoln40113‎, 09-26-2013 02:06 PM
    • Replies: 8
    • Views: 3,494
    09-26-2013, 09:42 PM Go to last post
  28. Question Occupany problem

    This is a homework problem that deals with occupancy. Q: consider r indistinguishable balls and n cells where n > r. The r balls are placed at...

    Started by TrikyMove‎, 09-23-2013 09:44 PM
    • Replies: 6
    • Views: 2,791
    09-25-2013, 06:47 PM Go to last post
  29. Multiple comparisons in SEM

    Hello, I am using the Multiple Group Analysis function in AMOS to compare three groups. I am using pairwise comparisons to compare group 1 with...

    Started by April‎, 09-24-2013 10:30 AM
    amos, moderation, multiple comparisons, sem
    • Replies: 0
    • Views: 1,334
    09-24-2013, 10:30 AM Go to last post
  30. no clue how to do this question

    "The probability that any given person has a certain gene is 0.8 percent. Among people who have this gene, 80% test positively for it. Among people...

    Started by kingsolomonsgrave‎, 09-23-2013 02:40 PM
    • Replies: 4
    • Views: 1,848
    09-23-2013, 04:51 PM Go to last post
  31. Exclamation Joint marginal conditional probabilities HELP please ;)

    An organization was surveyed with regard to the number of children each member had. The gender of the parent was also considered. The results...

    Started by Manueldo‎, 09-22-2013 03:55 PM
    • Replies: 2
    • Views: 2,686
    09-22-2013, 05:55 PM Go to last post
  32. Probabilities from Distribution Functions

    Buses arrive at fifteen minute intervals starting at noon. Anne arrives at the bus stop X minutes after noon, where X is a random variable with...

    Started by cymol‎, 09-22-2013 05:04 PM
    cumulative, distribution probability, probability function
    • Replies: 1
    • Views: 2,664
    09-22-2013, 05:06 PM Go to last post
  33. Conditional probability problem

    Hey all, I hope you can help me with this problem. Say that tomorrow I can go to Berlim with a probability of 20%, Madrid with a probability of...

    Started by joaorob‎, 09-22-2013 06:47 AM
    conditional probability
    • Replies: 1
    • Views: 1,454
    09-22-2013, 02:12 PM Go to last post
  34. Prob distribution

    The roulette wheel has 38 “pockets”. The “pockets” are numbered 1, 2, …, 36; 0 and 00. Half of the “pockets” 1, 2, …, 36 are coloured red, the...

    Started by lemon_kaka‎, 09-20-2013 10:38 PM
    • Replies: 8
    • Views: 1,889
    09-22-2013, 07:02 AM Go to last post
  35. probability

    A congested computer network has a 0.002 probability of losinga data packet and packet losses are independent events. Alost packet must be resent....

    Started by amoeba88‎, 09-22-2013 01:21 AM
    • Replies: 1
    • Views: 5,014
    09-22-2013, 04:30 AM Go to last post
  36. Probability Noob

    Hey guys, Im a noob im taking Prob & Stats for Eng. Im only familiar with probability of getting a 4 by rolling a die. Anyway I just wanted to run...

    Started by bigbob‎, 09-21-2013 09:51 PM
    • Replies: 0
    • Views: 4,517
    09-21-2013, 09:51 PM Go to last post
  37. Generalizability of results / External validity

    Hi everyone, Employment of probability sampling to draw a sample from the population in a quantitative study (cross-sectional design, data...

    Started by Renāta‎, 09-19-2013 09:08 AM
    inference, sample population, validity
    • Replies: 5
    • Views: 3,625
    09-19-2013, 11:59 AM Go to last post
  38. Tricky problem about 9 houses

    Ace Home Inspectors inspect nine houses each business day. Because AHI has been keeping records for several years they know that the probability of...

    Started by Manueldo‎, 09-18-2013 05:14 PM
    confused, probability, random, statisics
    • Replies: 0
    • Views: 1,399
    09-18-2013, 05:14 PM Go to last post
  39. Normal Distribution of a chocolate bar

    Hey all, I was hoping you can help me out with a question I have trouble translating into math. A factory manufactures chocolate bars with a...

    Started by fiffette‎, 09-18-2013 08:14 AM
    • Replies: 0
    • Views: 3,422
    09-18-2013, 08:14 AM Go to last post
  40. Percentage/zscore

    What percentage of drivers drive over 72 mph? I know I have to convert 72 into a Z-score. Im not sure if thats the answer or more to it?

    Started by aire51‎, 09-15-2013 05:57 PM
    • Replies: 1
    • Views: 1,597
    09-17-2013, 10:54 AM Go to last post
  41. wishart distribution and correlation matrix???

    hey there everyone! just a quick question.... you see how the sampling distribution of the covariance matrix follows a wishart distribution (for...

    Started by will22‎, 03-22-2011 02:10 PM
    • Replies: 7
    • Views: 9,231
    09-16-2013, 03:01 AM Go to last post
  42. Came across a very difficult problem...

    I really thought hard over this problem for about a hour or two. Here's the problem: A coin has P(head) = p. Keep tossing until you finish a run...

    Started by vxs8122‎, 09-07-2013 11:59 PM
    • Replies: 4
    • Views: 1,954
    09-12-2013, 02:06 PM Go to last post
  43. Probability(x<X)

    If I have the size of two areas and then the size of the intersection. How may I work out the probability of if I changed an area, the new...

    Started by Mrkeri‎, 09-09-2013 04:58 AM
    probability
    • Replies: 0
    • Views: 1,564
    09-09-2013, 04:58 AM Go to last post
  44. Mean of discrete distributions

    Hi All, Need your help on understanding the following. Suppose we have a conditional probability distribution P(C|A,B) over...

    Started by stat_newbie‎, 09-08-2013 12:51 PM
    • Replies: 4
    • Views: 1,991
    09-08-2013, 01:32 PM Go to last post
  45. Joint Probability Distribution conditional

    Hi Guys Please see attached the joint probability distribution. X = amount of winnings for B (0 represents a tie) Y= Whether A Studied...

    Started by excelmac‎, 09-07-2013 01:42 PM
    • Replies: 0
    • Views: 1,239
    09-07-2013, 01:42 PM Go to last post
  46. Joint Probability problem

    Hi again! Have a bit of a problem with this question and would gratefully appreciate some help. There are 4 cards in a game, numbered 1 to 4. A...

    Started by fiffette‎, 09-07-2013 11:38 AM
    • Replies: 3
    • Views: 1,938
    09-07-2013, 12:44 PM Go to last post
  47. College Smokers

    This is a proportion of a sampling distribution from what I can tell: I have thought and thought on how to finish this problem. I have read my...

    Started by racapozzi‎, 09-07-2013 01:49 AM
    • Replies: 2
    • Views: 2,247
    09-07-2013, 02:05 AM Go to last post
  48. How to use Weibull statistics?

    My problem is the following. I have the results of mechanical (tensile) tests performed at different temperatures. I found that below certain...

    Started by BorisM‎, 09-06-2013 02:58 AM
    • Replies: 1
    • Views: 1,342
    09-06-2013, 10:29 AM Go to last post
  49. Area Probability comparison

    It's been a while since I have studied statistics, but it seems I need it for my work. I have found and area of intersection between two others...

    Started by Mrkeri‎, 09-05-2013 07:05 AM
    probability
    • Replies: 2
    • Views: 1,551
    09-06-2013, 04:49 AM Go to last post
  50. Lightbulb Small combinatorics question

    Hey all! I was hoping you could help me get a 'second opinion' to a problem I ran into. It's most likely one of the most basic combinatorics question...

    Started by fiffette‎, 09-04-2013 10:12 AM
    • Replies: 1
    • Views: 1,214
    09-04-2013, 10:40 AM Go to last post
  51. Tricky problem solution

    Hi, A soccer team plays matches. -- If in a previous match it won, it has a 0.6 chance to win in the next match (if it failed, the chances to...

    Started by alexeymosc‎, 08-26-2013 09:31 AM
    • Replies: 4
    • Views: 2,192
    09-04-2013, 12:57 AM Go to last post
  52. Birthday problem using Bernoulli trails

    I came up with this problem: What is the approximate probability that no two people in a group of seven have the same birthday? So, I set up...

    Started by vxs8122‎, 09-02-2013 02:54 PM
    • Replies: 5
    • Views: 3,104
    09-02-2013, 03:36 PM Go to last post
  53. Time scaling a geometric random variable

    Hello, When one performs bernoulli trials at discrete times t = 1, 2, 3, ....., with the probability of a success at an arbitrary trial given by...

    Started by mathRookie2013‎, 09-01-2013 11:29 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 4,259
    09-01-2013, 03:44 PM Go to last post
  54. cumulants

    I don't know much about cumulants. What I know is that they can be generated by using the cumulant generating function g(t) = \log(E). I'm studying...

    Started by Kiuhnm‎, 08-28-2013 04:05 PM
    cumulants
    • Replies: 1
    • Views: 2,164
    08-29-2013, 12:54 AM Go to last post
  55. Calculating Hazard Ratios

    Hi there, I would like to calculate the hazard ratio (or deviation from the mean) for an 'event' My data has the dates of 'events' and I would...

    Started by MrT‎, 08-28-2013 01:48 AM
    • Replies: 4
    • Views: 8,784
    08-28-2013, 09:12 AM Go to last post
  56. Question Conditional probability problem

    One in five of Cadbury's specially marked chocolate bars (Promotion Products) will be packaged in a wrapper that entitles the holder to an instant...

    Started by lemon_kaka‎, 08-27-2013 10:46 PM
    • Replies: 3
    • Views: 2,226
    08-28-2013, 01:13 AM Go to last post
  57. Balls in a jar

    I wonder if my approach to this is correct- Say I have a jar with 10 balls, 9 of which are green and 1 that is red. I start taking out a ball at a...

    Started by fiffette‎, 08-26-2013 12:06 PM
    • Replies: 12
    • Views: 3,225
    08-27-2013, 11:14 AM Go to last post
  58. Proving the equality of two expressions

    Started by TrueTears‎, 08-27-2013 07:48 AM
    • Replies: 8
    • Views: 2,152
    08-27-2013, 11:06 AM Go to last post
  59. Lightbulb A little help with what seems to be conditional probability

    Hey guys, I want to make sure that I'm working this question correctly. Here goes: A jar has 5 white balls. A ball is taken out randomly - if it's...

    Started by fiffette‎, 08-24-2013 08:25 AM
    • Replies: 3
    • Views: 1,982
    08-26-2013, 04:56 PM Go to last post
  60. Weibull distribution for data with zero's

    Hi, Can any one tell me how to fit some data with zero's to a weibull fit using Matlab. I tried using Maximum Likelihood Estimator and wbfit....

    Started by vinay_aero‎, 08-26-2013 11:18 AM
    matlab, probability distribution, weibull
    • Replies: 0
    • Views: 1,595
    08-26-2013, 11:18 AM Go to last post

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