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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: 30,178
    09-30-2005, 09:44 AM Go to last post
  1. Determining p-values, significant cutoffs and false discovery in non-normal data

    Hi, I have a set of data points from a genetic study. I wish to ascertain which of these data points is statistically significant. The data is not...

    Started by gwilymh‎, 06-19-2013 06:37 PM
    cutoff, false discover, multiple testing, normal distributed, probabilty
    • Replies: 2
    • Views: 1,324
    06-21-2013, 12:03 PM Go to last post
  2. Property of independent random variables

    hello! I'm trying to understand the following property: Let X and Y be independent random variables z: = X + Y. Then where fZ (z) is the...

    Started by alfred_oh‎, 06-16-2013 12:20 PM
    • Replies: 3
    • Views: 1,688
    06-21-2013, 11:36 AM Go to last post
  3. Quick Probability Increase Logic Question

    I have 2 events, each increase the overall probability by 20%, events are independent of each other: Original probability 10/100 1st event...

    Started by chorn‎, 06-19-2013 07:23 AM
    • Replies: 1
    • Views: 1,990
    06-21-2013, 11:25 AM Go to last post
  4. Help with probabilities question

    It's kind of complicated, and I'm not even sure how to phrase it in statistics/probabilities terminology, so I'll just describe the problem: You...

    Started by King Joey‎, 06-21-2013 04:10 AM
    • Replies: 1
    • Views: 1,742
    06-21-2013, 05:11 AM Go to last post
  5. Sufficiency and contional sufficiency?

    Suppose p(x,y|a)=p(T(x),y|a)h(x,y) and p(x,a)=p(T(x)|a)g(x), where a is the parameter of inference. Then, g(x)= {int p(T(x),y|a)h(x,y)}/ {int...

    Started by KevinZh‎, 06-20-2013 05:41 PM
    • Replies: 0
    • Views: 1,360
    06-20-2013, 05:41 PM Go to last post
  6. Post what method to use?

    Hi: Here is the problems to solve: There are a certain amount of balls. They can be white, blue, green and red in color. There is a machine can...

    Started by samshen‎, 06-19-2013 11:26 AM
    • Replies: 3
    • Views: 981
    06-20-2013, 12:07 PM Go to last post
  7. Central limit theorem - Approximation the Sum of Bernoullis to Normal Distribution

    Hello, I'm new in this forum and I would like to ask for your help. I have a set of Independent Bernoulli random variables, but they are not...

    Started by guerreiro74‎, 06-18-2013 07:34 AM
    approximation, bernoulli, clt, not iid
    • Replies: 9
    • Views: 2,434
    06-19-2013, 02:47 PM Go to last post
  8. Question Joint distribution from multiple marginals

    Consider an experiment consisting of a repeated trial with two random Bernoulli (=binary) variables, A and B. Each trial consists of multiple...

    Started by Angelorf‎, 05-20-2013 12:22 PM
    estimation, joint distribution, marginals, repeated tests
    • Replies: 4
    • Views: 1,707
    06-19-2013, 06:21 AM Go to last post
  9. Different Interpretations of the Central Limit Theorem

    My friend and I are having an argument about the meaning of CLT. It led to me build this javascript experiment which you may enjoy:...

    Started by aut0pilot101‎, 06-18-2013 06:59 PM
    • Replies: 2
    • Views: 3,286
    06-18-2013, 07:33 PM Go to last post
  10. Probability of a Time Game in Ruzzle

    I am not a statistic savant, but I am mathematically minded. My friend asked me today what I thought the odds were of a game of Ruzzle ending in a...

    Started by bpbenda‎, 06-17-2013 03:20 PM
    • Replies: 1
    • Views: 2,964
    06-17-2013, 03:25 PM Go to last post
  11. Poisson Process Problem

    People come into a store according to a Poisson process with rate: lambda (t) = 0.0025*t (people / period) Of all the people who arrive between...

    Started by Wolkuz‎, 05-27-2013 12:52 AM
    poisson process
    • Replies: 4
    • Views: 2,139
    06-17-2013, 06:17 AM Go to last post
  12. Probability of sum of 6 digit number

    Hi, What is the probability of sum of any 6 digit number (ranging from 000000 to 999999) to be equal to 12. Actually I am looking for the...

    Started by badaya‎, 06-14-2013 11:47 AM
    • Replies: 6
    • Views: 3,911
    06-14-2013, 01:42 PM Go to last post
  13. Geometric Distribution of 2 Independent Random Variables

    Hey Guys, I have an exam coming up for my stats paper soon and as I was looking over past assignment questions I came across this question which I...

    Started by panderson‎, 06-14-2013 03:17 AM
    • Replies: 1
    • Views: 2,648
    06-14-2013, 04:00 AM Go to last post
  14. Predicting probability with standard deviations, mean high and low values.

    I registered on this forum specifically to ask this question. This is not homework, it's simply a for fun/hobby problem I am trying to solve. This...

    Started by Cuda1337‎, 08-22-2012 04:59 PM
    • Replies: 5
    • Views: 5,180
    06-14-2013, 03:55 AM Go to last post
  15. Real life example for pairwise independent mutually dependent RVs

    Three or more pairwise independent variables may be mutually dependent. There are several mathematical examples like Bernsteins Paradox. I am...

    Started by carlfriedrich‎, 06-13-2013 02:19 PM
    • Replies: 0
    • Views: 2,376
    06-13-2013, 02:19 PM Go to last post
  16. Searching for statistical significance

    I need to answer this simple question in order to show that my experimental results are statistically significant. This is probably a very easy...

    Started by Dion‎, 06-13-2013 06:55 AM
    probability question
    • Replies: 2
    • Views: 1,835
    06-13-2013, 08:04 AM Go to last post
  17. Lottery Game Question (6/42)

    So I'm having a little difficulty with this lottery game question. I think this game is similar to the actual 6/49 game in Atlantic Canada, if anyone...

    Started by grape‎, 06-12-2013 03:44 PM
    combinations, lottery, probability
    • Replies: 2
    • Views: 3,282
    06-12-2013, 04:09 PM Go to last post
  18. Probability

    According to a survey done by a dealership company, they have 40% of customer who enters the shop that are woman and it says that there are 37% of...

    Started by Davina64‎, 06-10-2013 12:33 PM
    • Replies: 3
    • Views: 1,738
    06-11-2013, 08:03 AM Go to last post
  19. what's the chance that a number n is prime IF....?

    so... a compuer science friend of mine and myself were having lunch together and discussing whether or not studying number theory can be your one-way...

    Started by spunky‎, 06-10-2013 03:47 PM
    • Replies: 9
    • Views: 1,366
    06-11-2013, 02:33 AM Go to last post
  20. Exponential Distribution, X + Y

    Hello Guys, I have no clue how to solve the following problem: "X and Y are exponential distributed and independend with the parameter lambda >...

    Started by lunxcell‎, 06-10-2013 05:28 AM
    • Replies: 1
    • Views: 1,623
    06-10-2013, 05:49 AM Go to last post
  21. Is this a prob distribution?

    Hi, How do you find an average of a reducing sample: miles 0-10 10=20 20-30 30-40 midpoint 5 15 25 30 cars 5 4 3 1 failures 0 3 2 1 rate...

    Started by LizR‎, 06-09-2013 03:34 PM
    • Replies: 0
    • Views: 1,104
    06-09-2013, 03:34 PM Go to last post
  22. Show that a stochastic variable is allmost this expression.

    Hi We have a binomial situation where the p value is: p=\frac{2}{a}, our end goal is to find an estimator for a, and an estimate for this...

    Started by Samwell‎, 06-08-2013 10:45 AM
    • Replies: 8
    • Views: 1,649
    06-09-2013, 11:05 AM Go to last post
  23. Multiplication (Bernoulli Distribution)

    Hello, I'm not sure, if I understand the following question right: There are two independend Variables X and Y with X ~ Bernoulli(p) und Y ~...

    Started by lunxcell‎, 06-09-2013 09:47 AM
    • Replies: 1
    • Views: 1,925
    06-09-2013, 10:00 AM Go to last post
  24. Probability on a normal curve

    Hey all - It's been a long time since I was in school looking at probability and statistics. i have a bit of a difficult question for me. I have...

    Started by AJ Laura‎, 06-07-2013 08:42 AM
    curve, normal, probability, statistics
    • Replies: 10
    • Views: 1,622
    06-07-2013, 01:47 PM Go to last post
  25. Probability of queuing

    We are students and we developing the project of a music festival that takes place in 3 venues. We have identified some risks; one of those is...

    Started by 0liver‎, 06-05-2013 12:32 PM
    capacity, probability, queuing, time
    • Replies: 2
    • Views: 1,712
    06-06-2013, 11:31 AM Go to last post
  26. Different arrangments of n 0's and m 1's

    This simply stated problem is giving me some trouble: How many different ways can I arrange n 0's and m 1's? Perhaps someone would direct me...

    Started by BigBugBuzz‎, 06-05-2013 05:56 PM
    combinations
    • Replies: 5
    • Views: 1,639
    06-06-2013, 05:54 AM Go to last post
  27. Estimating parameter from conditionals of non-independent data

    The context of this problem is the estimation of the distribution of a parameter v given sets of data A and B, where A and B are not independent. ...

    Started by VelocideX‎, 06-02-2013 06:33 PM
    bayes thoerem, conditional probability, correlation, dependent variables, inference
    • Replies: 0
    • Views: 1,201
    06-02-2013, 06:33 PM Go to last post
  28. Two Variables with the same distribution

    Hello, I study IT and need help with the following problems: 1) two variables, Y and Z have the same distribution. Y and Z can be 0 or 1. I need...

    Started by lunxcell‎, 06-02-2013 10:23 AM
    • Replies: 2
    • Views: 1,297
    06-02-2013, 01:30 PM Go to last post
  29. Radio Competition - HELP NEEDED!

    Hi, I'm a producer on a big (US) Radio station. I'm developing a new competition, but I need help with the probability... The game is simple...

    Started by ProducerGeoff‎, 05-30-2013 05:58 AM
    simulate
    • Replies: 12
    • Views: 2,017
    05-30-2013, 04:12 PM Go to last post
  30. Fitting a Normal Distribution

    I am trying to fit a normal distribution with unknown mean and standard deviation based on a sample of observations. I know how to use an approach...

    Started by JohnSea‎, 05-28-2013 10:00 PM
    • Replies: 2
    • Views: 1,837
    05-28-2013, 11:46 PM Go to last post
  31. Dice probability problem

    2 defending dice do battle with a attacking dice, where a can be any positive integer. The highest scoring defender die is paired with the highest...

    Started by GameGod‎, 05-25-2013 08:46 AM
    • Replies: 10
    • Views: 2,652
    05-28-2013, 06:41 PM Go to last post
  32. Poisson

    The number of pacients that get into the hospital is 36 per day. Wich is the probability that in one hour 4 pacients get in.

    Started by yonerflash‎, 05-25-2013 08:59 AM
    poisson
    • Replies: 7
    • Views: 2,018
    05-27-2013, 07:18 PM Go to last post
  33. Need help developing a probability calculator for game

    The goal of this game is to get your opponents life points down to 0 before he gets yours down to 0. You take turns hitting each other until one...

    Started by firefight33‎, 05-27-2013 12:26 AM
    geometric distribution, markov chain
    • Replies: 3
    • Views: 1,281
    05-27-2013, 05:02 PM Go to last post
  34. Question Type I and Type II error

    Does anyone know the formula for getting Type I and II error? I found examples around the web but i didnt understand though i need to have the std,...

    Started by ddtankerz‎, 05-26-2013 07:16 AM
    • Replies: 4
    • Views: 978
    05-27-2013, 11:09 AM Go to last post
  35. Question on Probability Distribution

    Hi, I am new here, and my name is Jonas. I'm a CS major at a university in the Northeast US. I'm a senior and wrapping up degree requirements which...

    Started by JonasJSchreiber‎, 04-26-2013 06:51 PM
    • Replies: 2
    • Views: 1,585
    05-25-2013, 07:43 AM Go to last post
  36. Need help figuring this out...

    Three gentlemen, Prof. Plum, Mr. Green, and Col. Mustard, have offended each others' honor. They will settle their dispute with a duel truel with...

    Started by nipatel‎, 05-07-2013 08:28 PM
    • Replies: 8
    • Views: 2,426
    05-24-2013, 10:26 PM Go to last post
  37. Question Involving # of Defective Products

    So I'm independently studying for exam P/1 and ran across this question in one of the previous exams: A store has 80 modems in its inventory, 30...

    Started by StatsMan04‎, 05-22-2013 07:22 PM
    • Replies: 1
    • Views: 2,181
    05-24-2013, 10:02 PM Go to last post
  38. Changing the units changes the scale and shape of Weibull pdf?

    I don't know how to delete the post.:(

    Started by jpcgandre‎, 05-24-2013 06:14 PM
    parameters, weibull
    • Replies: 0
    • Views: 1,129
    05-24-2013, 06:14 PM Go to last post
  39. Probability of occurance-I don't understand my instructor's solution

    Hello: I am in a statistical process control class and we are studying control charts. My instructor gave the following problem: For the...

    Started by sspillane‎, 05-21-2013 11:09 AM
    • Replies: 10
    • Views: 1,731
    05-23-2013, 03:40 PM Go to last post
  40. Test significance of gene overlap between two gene lists by chance

    I am very new to bioinformatics and statistics so trying to ask around for help. I am working with expression data from two different antibody...

    Started by pmulinti‎, 05-21-2013 01:12 PM
    • Replies: 3
    • Views: 6,088
    05-22-2013, 11:32 AM Go to last post
  41. Keno problem: last ball doubles the prize.

    Hi, I'm trying to solve this problem, but apparently, Im going in the wrong direction. It's a Keno Game, you choose 15 balls out of 80...

    Started by paulaks‎, 05-20-2013 10:05 PM
    • Replies: 0
    • Views: 825
    05-20-2013, 10:05 PM Go to last post
  42. Chance of Beating the House In Roulette

    Hi, I was wondering how I could calculate this. I tried two different methods and got the same answer, but I'm not sure if I'm attacking the problem...

    Started by kxiao‎, 05-19-2013 02:27 PM
    • Replies: 1
    • Views: 2,135
    05-20-2013, 11:55 AM Go to last post
  43. Post Binomial variability

    Hi, I have in my research 45 children who took a test twice and the score is either (correct or incorrect). I calculated confidence intervals for...

    Started by Nadahmed‎, 05-19-2013 02:25 PM
    • Replies: 0
    • Views: 1,154
    05-19-2013, 02:25 PM Go to last post
  44. 'Shifted' Poisson Processes?

    Hi all. Im a graduate student in ops research, but my research is in the optimization side of things more so than the stochastic processes. I...

    Started by TeoNichelli‎, 05-17-2013 03:22 PM
    • Replies: 2
    • Views: 10,503
    05-18-2013, 03:05 PM Go to last post
  45. Probability of event vs. (?) probability of event occurring by chance

    Hi there: This is my first post so please forgive me if I am in the wrong section. This is not technically "homework", but it is a question that I...

    Started by blue11‎, 05-16-2013 10:33 PM
    • Replies: 6
    • Views: 2,691
    05-17-2013, 05:29 PM Go to last post
  46. Minimum of 2 dependent Random Variables

    Guys, how can I find the distribution of the min between two random variables, if the two random variables are not independent?

    Started by bestfede‎, 05-17-2013 08:46 AM
    • Replies: 1
    • Views: 3,266
    05-17-2013, 12:31 PM Go to last post
  47. Poisson Distribution

    Hai everyone, I am stuck with this exercise Arrivals to a bank automated teller machine (ATM) are distributed according to a poisson...

    Started by Davina64‎, 05-16-2013 01:18 PM
    • Replies: 4
    • Views: 2,923
    05-16-2013, 02:29 PM Go to last post
  48. Exercise probability

    Hi all, I would need some help with a probability exercise. I am sure you can help me. So here it is: We have an urn which contains 1000 balls...

    Started by kimi12345‎, 05-14-2013 09:30 AM
    • Replies: 3
    • Views: 2,206
    05-15-2013, 04:46 PM Go to last post
  49. Expected Value Distribution

    Hi, I have a question pertaining to the problem: The expected value of the number of customers entering a shop during a 15 minute time interval...

    Started by Bikelyst‎, 05-15-2013 03:27 PM
    • Replies: 6
    • Views: 1,751
    05-15-2013, 04:13 PM Go to last post
  50. Probability distribution

    hi everyone, I am unable to solve this exercice can you help me please ? Exercice : Starbucks has entered into an agreement with a...

    Started by Davina64‎, 05-15-2013 12:35 PM
    • Replies: 4
    • Views: 1,822
    05-15-2013, 01:30 PM Go to last post
  51. Poisson Process Question (Last)

    Could someone kindly check whether or not my answer is correct to part a of the question. Ive listed the solutionts to part b) which I found on the...

    Started by chrishello‎, 05-15-2013 12:14 PM
    • Replies: 0
    • Views: 1,046
    05-15-2013, 12:14 PM Go to last post
  52. Possion Process Question

    Uploaded with ImageShack.us I attempted this question and I was wondering two things 1) whether the answer is correct 2) and whether the hand...

    Started by chrishello‎, 05-15-2013 12:04 PM
    • Replies: 0
    • Views: 1,054
    05-15-2013, 12:04 PM Go to last post
  53. conditional probability and trial of experiments

    Consider a medical test for a disease, D. The test mostly gives the right answer, but not always. Say its false-negative rate is 1% and its...

    Started by asif‎, 05-14-2013 05:09 AM
    conditional probabilities, false negative, false positives, trial
    • Replies: 2
    • Views: 1,389
    05-15-2013, 07:43 AM Go to last post
  54. Binomial probability

    A number of trials were run with a high success rate, n = 1700 & 99.9% success How can I calculate (with 95% confidence) the lowest probability of...

    Started by George Bea‎, 05-07-2013 04:11 AM
    • Replies: 8
    • Views: 1,869
    05-15-2013, 06:24 AM Go to last post
  55. Probability: Conditional Vs. Joint Issue

    Hi all, Brand new to this site. I've read the posting rules, but please feel free to herd me into the correct way of doing things with this...

    Started by masterofchupi‎, 05-14-2013 06:24 PM
    conditional probabilities, joint probability, probability
    • Replies: 1
    • Views: 2,072
    05-14-2013, 06:39 PM Go to last post
  56. 1-bimoncdf vs binomcdf

    Hey, everyone. I'm new here, and I was just wondering what the difference is between 1-Binomcdf and Binomcdf?

    Started by hergreenatrocity‎, 05-14-2013 11:10 AM
    1-binomcdf, binomcdf, binomial, binomial probability, probability
    • Replies: 2
    • Views: 3,306
    05-14-2013, 12:33 PM Go to last post
  57. OC Curve (n, c) Unknown

    So, my teacher gave me some extra credit assignment where we're supposed to make a program to find the (n, c) values of an OC Curve... We're given...

    Started by statsman2013‎, 05-04-2013 12:51 PM
    • Replies: 1
    • Views: 2,213
    05-12-2013, 06:16 PM Go to last post
  58. Proportion and Expected

    The Proportion of college student who take Stats is P=.22 A)If 200 college students are selected at randon, how many would you expect to take...

    Started by PSG‎, 05-11-2013 05:30 PM
    • Replies: 5
    • Views: 1,494
    05-11-2013, 09:50 PM Go to last post
  59. Probabilities from Excel's RANDBETWEEN

    I created a craps (dice) model in Excel using its RANDBETWEEN function and nested IF functions. I noticed that based on theoretical probabilities I...

    Started by montoya723‎, 05-10-2013 10:50 PM
    • Replies: 0
    • Views: 1,486
    05-10-2013, 10:50 PM Go to last post
  60. Not Homework--Need Solutions!

    I'm studying for an exam tomorrow. I have last years exam from the same teacher but cannot find solutions and I am stuck! 1: An electric...

    Started by krams6‎, 05-10-2013 01:53 PM
    • Replies: 1
    • Views: 1,866
    05-10-2013, 02:44 PM Go to last post

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