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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: 31,080
    09-30-2005, 09:44 AM Go to last post
  1. 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: 1,421
    07-29-2014, 07:29 PM Go to last post
  2. 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: 1,584
    07-29-2014, 06:51 AM Go to last post
  3. 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: 2,380
    07-28-2014, 09:57 AM Go to last post
  4. 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: 2,650
    07-28-2014, 08:40 AM Go to last post
  5. 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: 2,749
    07-27-2014, 09:26 AM Go to last post
  6. 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: 2,127
    07-27-2014, 02:43 AM Go to last post
  7. 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: 1,700
    07-23-2014, 06:34 PM Go to last post
  8. 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: 1,902
    07-22-2014, 12:57 PM Go to last post
  9. 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: 1,919
    07-21-2014, 11:47 AM Go to last post
  10. 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: 955
    07-19-2014, 10:53 AM Go to last post
  11. 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: 1,496
    07-18-2014, 10:46 AM Go to last post
  12. 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: 2,658
    07-12-2014, 06:41 PM Go to last post
  13. 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: 2,001
    07-10-2014, 03:10 AM Go to last post
  14. 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: 2,043
    07-09-2014, 03:15 PM Go to last post
  15. 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: 1,987
    07-08-2014, 04:27 PM Go to last post
  16. 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: 1,454
    07-08-2014, 09:01 AM Go to last post
  17. IP probability question

    hi guys. as you know, IP is a combination of 4 parts. every part is from 0-255, for example 234.32.135.7. now, my question is, what is the...

    Started by uv_h‎, 06-06-2014 09:48 AM
    probability
    • Replies: 6
    • Views: 2,803
    07-08-2014, 07:12 AM Go to last post
  18. 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: 1,791
    07-05-2014, 06:18 PM Go to last post
  19. 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: 1,411
    07-04-2014, 10:56 AM Go to last post
  20. 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: 1,304
    07-02-2014, 05:58 AM Go to last post
  21. 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: 4,462
    06-28-2014, 11:05 AM Go to last post
  22. 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: 3,139
    06-28-2014, 10:59 AM Go to last post
  23. 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: 1,314
    06-28-2014, 08:27 AM Go to last post
  24. 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: 849
    06-27-2014, 04:14 PM Go to last post
  25. 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: 2,611
    06-26-2014, 10:26 PM Go to last post
  26. 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: 1,331
    06-25-2014, 11:03 AM Go to last post
  27. 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: 2,646
    06-22-2014, 02:10 AM Go to last post
  28. 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: 1,566
    06-20-2014, 02:37 PM Go to last post
  29. 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: 1,590
    06-19-2014, 01:27 AM Go to last post
  30. 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: 3,236
    06-18-2014, 01:45 PM Go to last post
  31. 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: 3,810
    06-18-2014, 12:50 AM Go to last post
  32. 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: 1,930
    06-13-2014, 05:15 PM Go to last post
  33. 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: 1,512
    06-11-2014, 01:56 AM Go to last post
  34. 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: 1,707
    06-10-2014, 08:36 AM Go to last post
  35. 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: 1,992
    06-10-2014, 07:16 AM Go to last post
  36. 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: 1,623
    06-09-2014, 04:30 AM Go to last post
  37. 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: 2,033
    06-07-2014, 09:34 PM Go to last post
  38. 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: 1,645
    06-07-2014, 03:12 PM Go to last post
  39. 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: 1,753
    06-06-2014, 01:02 AM Go to last post
  40. 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: 1,275
    06-04-2014, 02:43 PM Go to last post
  41. 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: 1,522
    06-04-2014, 12:15 PM Go to last post
  42. 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: 1,930
    06-04-2014, 06:53 AM Go to last post
  43. 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: 2,221
    06-02-2014, 05:16 PM Go to last post
  44. 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: 1,413
    06-02-2014, 09:12 AM Go to last post
  45. Bayes' Theorem applied to poker?

    please delete this post

    Started by coveby‎, 06-01-2014 05:46 AM
    poker bayes theorem
    • Replies: 1
    • Views: 1,957
    06-01-2014, 11:00 AM Go to last post
  46. 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: 2,305
    05-31-2014, 10:04 AM Go to last post
  47. 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: 1,381
    05-31-2014, 02:27 AM Go to last post
  48. 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: 1,481
    05-28-2014, 12:46 PM Go to last post
  49. 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: 1,372
    05-28-2014, 10:15 AM Go to last post
  50. 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: 2,273
    05-23-2014, 11:36 PM Go to last post
  51. 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: 1,476
    05-23-2014, 09:01 PM Go to last post
  52. 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: 3,900
    05-23-2014, 01:14 PM Go to last post
  53. 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: 5,307
    05-19-2014, 02:31 AM Go to last post
  54. 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: 2,237
    05-18-2014, 07:05 AM Go to last post
  55. 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: 2,238
    05-17-2014, 05:05 PM Go to last post
  56. Probability of 11 points first in a game? ** Simple **

    Hi all, I am a newbie here and has some simple probability, just would like to gauge how far i am... A match can be won with two ways: (1)...

    Started by calvtan‎, 05-16-2014 12:31 PM
    • Replies: 0
    • Views: 1,402
    05-16-2014, 12:31 PM Go to last post
  57. Application of binomial distribution

    Hello all, this is my first post. I am a practicing engineer facing a dilemma. Our resident statistician is out for the MONTH, and I have a deadline...

    Started by amf08006‎, 05-16-2014 08:53 AM
    • Replies: 0
    • Views: 2,266
    05-16-2014, 08:53 AM Go to last post
  58. Geometrical distribution problem

    I am trying to solve this problem: X_1, X_2,..., X_100 are independent and have geometrical distribition with probability of success 1/2...

    Started by bessi‎, 05-14-2014 04:18 PM
    • Replies: 1
    • Views: 1,546
    05-15-2014, 09:28 AM Go to last post
  59. Skydiving question... should be easy

    Hi all. I'm a skydiver and I just wanted to see if somebody could help me with a quick probability question. So, if we assume that there is a one...

    Started by reggie55‎, 05-13-2014 10:20 PM
    • Replies: 2
    • Views: 1,425
    05-15-2014, 02:36 AM Go to last post
  60. Sum of n random variables with normal distribution

    I am struggling with this problem: Independent random variables X_1, ... , X_n have normal distribution with mean 0 and variance 2. What is the...

    Started by bessi‎, 05-14-2014 11:05 AM
    distribution, normal distribution
    • Replies: 2
    • Views: 1,841
    05-14-2014, 03:13 PM Go to last post

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