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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: 10,784
    09-30-2005, 09:44 AM Go to last post
  1. Probability Math Homework

    If someone could please help. I got the first part of question correct, but cannot figure out how to calculate the second part of the question. ...

    Started by emily8319‎, 07-31-2014 02:03 PM
    • Replies: 2
    • Views: 103
    Yesterday, 10:47 AM Go to last post
  2. Interpretation histogram - normal versus logged variable

    For the histogram of my variable 'ambidexterity,' I predicted the data to have something like two normal distributions for this variable, one at the...

    Started by rob1‎, 07-31-2014 11:25 AM
    • Replies: 1
    • Views: 90
    07-31-2014, 11:49 AM Go to last post
  3. Statistically different tops for 2 parabolas with non-normal distributed data

    For situation 1 and 2 from my data came two parabola relations between variables X and Y. (the two parabolas have both a maximum) My question is...

    Started by rob1‎, 07-30-2014 05:32 PM
    • Replies: 4
    • Views: 178
    07-31-2014, 06:59 AM Go to last post
  4. Looking for an elegant mathematical expression

    Hi to you all, i am new at this forum and i am glad there is such. Problem description suppose i am playing two seperate games (independently!)...

    Started by yaron‎, 07-30-2014 09:15 AM
    • Replies: 2
    • Views: 78
    07-31-2014, 02:46 AM Go to last post
  5. Can't justify 'correct' answer

    I thought I understood sampling without replacement fairly well, but this problem has me stumped as the answer that I calculate doesn't appear to be...

    Started by Brother Maynard‎, 07-27-2014 09:05 PM
    • Replies: 2
    • Views: 119
    07-29-2014, 07:29 PM Go to last post
  6. Cumulative probability formula - majority of trials

    I posted a question below (28 June) on forward error correction which got no replies because it was too naive. I've found the answer I think which is...

    Started by crofter‎, 07-29-2014 06:51 AM
    • Replies: 0
    • Views: 61
    07-29-2014, 06:51 AM Go to last post
  7. Question Logistic Regression Problem

    Hi! My collegue is developing a logistic regression to predict the probability of a customer taking up a particular credit card. Let's call...

    Started by rbenzoj‎, 07-22-2014 01:19 PM
    correlation, logistic regression
    • Replies: 5
    • Views: 247
    07-28-2014, 09:57 AM Go to last post
  8. Number serviceable at given time

    If I have 50 systems each operating 400 hours per year with an MTBF of 900 hours how do I calculate how many would be serviceable at one time?...

    Started by brif‎, 07-24-2014 07:46 AM
    • Replies: 12
    • Views: 233
    07-28-2014, 08:40 AM Go to last post
  9. Question about well-suited poker hand

    Hi, I have the following question: A peculiar deck of playing cards is like a regular deck, but has five suits: spades, hearts, diamonds, clubs,...

    Started by Turtles123‎, 07-24-2014 03:25 PM
    • Replies: 2
    • Views: 146
    07-27-2014, 09:26 AM Go to last post
  10. Probability of sequences having 1-4 distinct numbers

    This is more of combinations problem, but I need to count the number of ways in order to get the probabilities. I would like to find the number...

    Started by Schoolman‎, 07-25-2014 08:10 AM
    • Replies: 1
    • Views: 79
    07-27-2014, 02:43 AM Go to last post
  11. Stochastic Integral

    Hi there, I created an account here trying to get some help on my problem. I'm really desperate as I'm going to need this for my work on my...

    Started by JBrettas‎, 07-17-2014 10:37 PM
    • Replies: 4
    • Views: 226
    07-23-2014, 06:34 PM Go to last post
  12. Probability based on multiple pieces of information

    It's been about 20 year since my last stats class and I'm working on a fun little side project that involves some probability. I'm having some...

    Started by bobbytables‎, 07-20-2014 10:25 PM
    • Replies: 9
    • Views: 245
    07-22-2014, 12:57 PM Go to last post
  13. Normal and standard distribution question

    I have X \sim N(0,1) and Y \sim N(\mu,\sigma^2) Apparently then Y =\sigma X + \mu I can't quite see how, and can't find anything on the...

    Started by Prometheus‎, 05-25-2014 08:50 AM
    • Replies: 6
    • Views: 315
    07-21-2014, 11:47 AM Go to last post
  14. Group Assortment Measure

    Hi I need a formula that returns a value representative of the amount of ‘assortment’ a group shows. The groups are made up of individuals, all of a...

    Started by josh1‎, 07-19-2014 10:53 AM
    • Replies: 0
    • Views: 94
    07-19-2014, 10:53 AM Go to last post
  15. PDF of (nearly) collinear variables

    My question is motivated by a problem with estimation by maximum likelihood. In simple terms, I want to estimate a parameter \beta and have three...

    Started by Sam Vimes‎, 07-18-2014 07:25 AM
    collinearity, likelihood function, probability distribution
    • Replies: 1
    • Views: 142
    07-18-2014, 10:46 AM Go to last post
  16. Probability of a sequence....

    HI Folks, New to the forum. It's nice to find a forum in this area. I hope someone can help me out. My goal is to determine if it is possible to...

    Started by MikCss‎, 05-29-2014 07:44 AM
    • Replies: 5
    • Views: 353
    07-12-2014, 06:41 PM Go to last post
  17. Need some help with probability and dice

    Hi guys, I'm making a board game and ran into some probability problems with dice. I use custom dice (green, blue, red, and yellow). The same...

    Started by Tucker‎, 07-09-2014 05:16 PM
    • Replies: 3
    • Views: 199
    07-10-2014, 03:10 AM Go to last post
  18. Exam Question / need help

    3-Suppose that you are in charge of marketing airline seats for a major airline company. Four days before the flight you have 12 seats remaining on...

    Started by duffann‎, 06-25-2014 01:36 AM
    • Replies: 2
    • Views: 270
    07-09-2014, 03:15 PM Go to last post
  19. How do you calculate and relate odds from two different experiments?

    a) Lets say I have a sack with 119 white balls and 1 black one. Pw=119/120 almost 99.17 % b) A guy called John comes and pick randomly picks a...

    Started by bghiggeri‎, 07-08-2014 04:27 PM
    • Replies: 0
    • Views: 156
    07-08-2014, 04:27 PM Go to last post
  20. Uniform Distribution - probabilities

    Hi guys, I am trying to solve an exercise but it seems to bem somehow strange. It is an experiment where A believes that men are bigger than women...

    Started by mathstats‎, 07-08-2014 03:15 AM
    uniform distribution
    • Replies: 2
    • Views: 134
    07-08-2014, 09:01 AM Go to last post
  21. IP probability question

    hi guys. as you know, IP is a combination of 4 parts. every part is from 0-255, for example now, my question is, what is the...

    Started by uv_h‎, 06-06-2014 09:48 AM
    • Replies: 6
    • Views: 373
    07-08-2014, 07:12 AM Go to last post
  22. Would love some assistance with understanding this puzzling probability "game"

    Hello everyone, This is my first post here, so please be gentle :). I'd like to thank everyone in advance for any help that can be given. ...

    Started by Habanero‎, 07-05-2014 12:25 AM
    • Replies: 3
    • Views: 266
    07-05-2014, 06:18 PM Go to last post
  23. Question Probit regression - Interpretation of marginal effects of IVs in log/percentage form

    Dear talkstats-community, I already spent hours on websearch for an answer on a question I have regarding the interpretation of marginal effects...

    Started by MSCBUS‎, 07-03-2014 06:54 AM
    marginal effects, marginal probability, probit regression
    • Replies: 1
    • Views: 183
    07-04-2014, 10:56 AM Go to last post
  24. What are the chances?

    Question: How many times must A occur in order for C to occur 3 times and D to occur once? Every time A occurs, there is a 1 in 2,500 chance that...

    Started by timmah507‎, 06-21-2014 02:33 PM
    • Replies: 1
    • Views: 218
    07-02-2014, 05:58 AM Go to last post
  25. Binomial distribution ! Need help!

    Hi, plz tell me if method to solve these question is correct or not! q)In a call centre 180 calls are received at random over a period of 12...

    Started by Shashank Prasad‎, 06-28-2014 11:05 AM
    • Replies: 0
    • Views: 70
    06-28-2014, 11:05 AM Go to last post
  26. Poisson distribution!! Need help

    Hi, Need help in solving few poisson distribution questions q)A dealer receives hard disks made by a certain manufacturer who on an average gives...

    Started by Shashank Prasad‎, 06-28-2014 10:59 AM
    • Replies: 0
    • Views: 46
    06-28-2014, 10:59 AM Go to last post
  27. Probability and forward error correction by parallel transmission

    I need a formula to express the probability of being able to correct single digit errors in a transmitted string of digits by transmitting the string...

    Started by crofter‎, 06-28-2014 08:27 AM
    • Replies: 0
    • Views: 204
    06-28-2014, 08:27 AM Go to last post
  28. Traffic light probability question.Need help!!

    Hi, Need help to solve this probability question. At a certain traffic signal red for 30 seconds, yellow for 5 seconds, and green for 25 seconds....

    Started by Shashank Prasad‎, 06-27-2014 04:22 PM
    • Replies: 0
    • Views: 46
    06-27-2014, 04:22 PM Go to last post
  29. Need help to solve Probability question!

    Hi, Need help to solve this probability question! A supplier of company X makes on average 5 defective pieces.The company accepts a sample if...

    Started by Shashank Prasad‎, 06-27-2014 04:14 PM
    • Replies: 0
    • Views: 51
    06-27-2014, 04:14 PM Go to last post
  30. Please help, need to find a book

    Dear friends, I need to find the textbook where the exercises on the photo (attached) come from. It's very urgent. Please help. Thank everybody.

    Started by East31‎, 06-25-2014 10:56 PM
    • Replies: 9
    • Views: 331
    06-26-2014, 10:26 PM Go to last post
  31. Simple Probability Question

    OK, so I am wondering about something and am not good with probability, but maybe someone here has the answer You have a die with only 4 sides,...

    Started by jp023‎, 06-25-2014 10:02 AM
    dice, math, probability, problem, question
    • Replies: 2
    • Views: 293
    06-25-2014, 11:03 AM Go to last post
  32. Poisson distribution, university exam quistion

    I have the following exam question witch I would appreciate some help with Question: In certain parts of a car one uses plastic plates. These...

    Started by Hytsky‎, 06-21-2014 03:47 PM
    • Replies: 1
    • Views: 270
    06-22-2014, 02:10 AM Go to last post
  33. Probability problem

    Ques- Suppose there are two bags A and B. A contains n white balls and 2 Black balls and B contains 2 white and n black balls. One of the two bags is...

    Started by MTE-11‎, 06-20-2014 08:48 AM
    • Replies: 1
    • Views: 186
    06-20-2014, 02:37 PM Go to last post
  34. Customer Retention Probability

    I'm not a statistician so forgive my ignorance. Here's what I'm trying to do: I have a list of all customers active and cancelled. I have tables...

    Started by stevedg‎, 06-18-2014 02:39 PM
    • Replies: 2
    • Views: 219
    06-19-2014, 01:27 AM Go to last post
  35. Homework help?

    Hi... So I'm taking statistics as an independent study this summer... Having troubles. I'm on my last question for the night. Can someone walk me...

    Started by AlmostdsntCount‎, 06-13-2014 10:59 PM
    • Replies: 6
    • Views: 324
    06-18-2014, 01:45 PM Go to last post
  36. Explanation counting principle problem

    If a travel agency o ers special weekend trips to 12 di erent cities, by air, rail, bus, or sea, in how many di erent ways can such a trip be...

    Started by davidchung2004‎, 06-17-2014 02:27 PM
    • Replies: 4
    • Views: 216
    06-18-2014, 12:50 AM Go to last post
  37. Which Probability Distribution Model to use?

    I have a data set in form of a csv file (attached with). This data set contains profiles of different candidates standing for election in a...

    Started by TanmayB‎, 06-13-2014 02:48 PM
    • Replies: 1
    • Views: 273
    06-13-2014, 05:15 PM Go to last post
  38. Probability of Winning

    Hi need some help to understand how the below probability can be determined If I pay $100 to play a game where if lose i lose the $100 but in case...

    Started by karthikgoel3‎, 06-11-2014 01:32 AM
    • Replies: 1
    • Views: 264
    06-11-2014, 01:56 AM Go to last post
  39. Soccer betting probability, risk and odds question - help

    Hello, Consider two different cases of soccer betting. 1) The first consists of 32 different sets of matches (each consisting of 5 matches with...

    Started by Ercello‎, 06-10-2014 08:36 AM
    betting, odds, probability, soccer
    • Replies: 0
    • Views: 180
    06-10-2014, 08:36 AM Go to last post
  40. Hypothesis testing : Help to formulate null hypothesis

    Hi all I'm currently doing a hypothesis testing to test a set of sample data (large sample size). From my knowledge of statistics, the null...

    Started by Corsa‎, 06-09-2014 01:32 AM
    • Replies: 3
    • Views: 264
    06-10-2014, 07:16 AM Go to last post
  41. Probability Help

    Hi, I giving my IGCSE this November and came across a problem that I can't solve. It'd be really helpful if someone can help me with the sum. ...

    Started by preziano‎, 06-09-2014 01:59 AM
    • Replies: 6
    • Views: 267
    06-09-2014, 04:30 AM Go to last post
  42. Help with interpreting data regarding religious Affiliation and aspirations to cheat

    An article is claiming that likelihood to cheat can be predicted by religious affiliation. I have provided some of their data on their sample of...

    Started by thecosmodreamer‎, 06-06-2014 11:30 PM
    probability, religion
    • Replies: 3
    • Views: 426
    06-07-2014, 09:34 PM Go to last post
  43. Probability of achieving an expected rate of return by targeting a constat VaR level

    Hi all, I am new to this website. Trying to infer the probability of achieving an expected annual rate of return say 10% (assuming my daily returns...

    Started by Kevpol‎, 06-04-2014 04:16 AM
    • Replies: 3
    • Views: 242
    06-07-2014, 03:12 PM Go to last post
  44. Prove that the SD of an asymmetric function is larger than the SD of a symmetric one

    How can I prove that the standard deviation of an asymmetric function (mean>median>mode) is larger than the standard deviation of a symmetric one...

    Started by Scrooge‎, 06-04-2014 12:52 PM
    • Replies: 8
    • Views: 280
    06-06-2014, 01:02 AM Go to last post
  45. Calculating two-tailed probability for Monte Carlo sampling distribution

    Hi, First off, I am new to this forum and would like to take this chance to say hi to everyone. I am currently working on a statistics project,...

    Started by samlin‎, 06-04-2014 02:43 PM
    • Replies: 0
    • Views: 265
    06-04-2014, 02:43 PM Go to last post
  46. Homework

    This particular problem has had me "stumped" for several hours. I need to turn in the assignment, however want to make sure my answer is correct. I...

    Started by tyson12‎, 06-04-2014 12:03 PM
    • Replies: 1
    • Views: 136
    06-04-2014, 12:15 PM Go to last post
  47. comparison with normal distribution truncated

    Hello, I would to know how to calculate the probability that X > Y when Y is greater than a given value p (X and Y are random variable following...

    Started by pascal34‎, 06-03-2014 10:49 AM
    gaussian distribution
    • Replies: 7
    • Views: 340
    06-04-2014, 06:53 AM Go to last post
  48. Negative binomial distribution

    Hello, I am a student at the university of Hasselt (Belgium) in management, and I had to follow a statistical course. It is for me very difficult...

    Started by bibifers‎, 06-02-2014 12:44 PM
    • Replies: 7
    • Views: 280
    06-02-2014, 05:16 PM Go to last post
  49. How to interprets this algorithm

    I make some algorithms to estimate the optimal values. and i want to model it algorithms using probabilistic theorem. but i dont know which...

    Started by gkyh0805‎, 06-02-2014 09:12 AM
    bayesian network, proability
    • Replies: 0
    • Views: 120
    06-02-2014, 09:12 AM Go to last post
  50. Bayes' Theorem applied to poker?

    please delete this post

    Started by coveby‎, 06-01-2014 05:46 AM
    poker bayes theorem
    • Replies: 1
    • Views: 202
    06-01-2014, 11:00 AM Go to last post
  51. Probability calculation of events that are related in a non-standard form.

    This should be a simple enough problem, but I find it to be a bit tricky. I am curious what the forums suggestions will be.. Look at the attached...

    Started by BenTan‎, 05-31-2014 12:41 AM
    • Replies: 3
    • Views: 276
    05-31-2014, 10:04 AM Go to last post
  52. How to get OR in STATA after xtlogi..,fe (multilevel)

    Hi guys I have been trying to get the odds ratios for my logistic multilevel regression with a fe estimator. I type my regression and then the...

    Started by mhedemark‎, 05-31-2014 02:27 AM
    fixed effects, logistic multilevel, odds ratio, stata
    • Replies: 0
    • Views: 176
    05-31-2014, 02:27 AM Go to last post
  53. least square estimator of a random variable

    Suppose we have an observation y = c+ e where c is an unknown constant and e is error with the pdf = exp(-e-1) for e >-1 . We want to determine the...

    Started by stephanie‎, 05-16-2014 01:25 PM
    • Replies: 1
    • Views: 245
    05-28-2014, 12:46 PM Go to last post
  54. Time series expectation

    Maybe it's because i've been at it for 8 hours straight today, but i'm stumped trying to show this is true: E=\sigma^2 Any help might spare my...

    Started by Prometheus‎, 05-25-2014 02:04 PM
    • Replies: 1
    • Views: 195
    05-28-2014, 10:15 AM Go to last post
  55. Probability vs sample size graph.

    Hi, if have a question about how a graph of probability vs sample size might look. I know the line would never be linear but it could either sigmoid...

    Started by Morganb4‎, 05-22-2014 10:01 PM
    • Replies: 6
    • Views: 351
    05-23-2014, 11:36 PM Go to last post
  56. To check whether data is normally distributed or not

    I have calculated mean, median and mode for set of data consisting of 1140 values. Output is: mean = 108.27 mode = 107 and median = 108. ...

    Started by jaggu‎, 05-23-2014 03:01 PM
    • Replies: 3
    • Views: 231
    05-23-2014, 09:01 PM Go to last post
  57. Homework exercise

    I have a homework which can not be fully resolved with my knowlage: Firm has 10 employees, 2 womens and 8 mens. The Management Board will randomly...

    Started by epicVoid‎, 05-23-2014 09:38 AM
    • Replies: 10
    • Views: 317
    05-23-2014, 01:14 PM Go to last post
  58. Probability question. Pi = ??

    Q: It is noted that 8% of abc students are left handed, if 20 students are randomly selected, calculate Probability that none of them are left...

    Started by tiochaota‎, 05-17-2014 04:23 AM
    • Replies: 4
    • Views: 442
    05-19-2014, 02:31 AM Go to last post
  59. Need help determing what formula to use

    Hello guys and gals, I have a problem with my homework since I have no idea what kind of formula to use. I have been searching for 1.5hour now to...

    Started by thalars90‎, 05-17-2014 04:19 PM
    • Replies: 4
    • Views: 301
    05-18-2014, 07:05 AM Go to last post
  60. Hi,please help

    Next weekend you will be participating in a 12 km cross country trail race on Table Mountain.The average time between two successive wild animal...

    Started by JoelM‎, 05-17-2014 05:05 PM
    • Replies: 0
    • Views: 223
    05-17-2014, 05:05 PM Go to last post

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