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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 10:44 AM
    • Replies: 0
    • Views: 14,860
    09-30-2005, 10:44 AM Go to last post
  1. Probability of someting that is yet to happen.

    Dear Reader, I was wondering if it would be possible to generate or calculate a probability or likelyhood of an event happening whilst you dont...

    Started by Refferic‎, 02-11-2016 03:56 PM
    • Replies: 2
    • Views: 148
    Yesterday, 03:37 AM Go to last post
  2. Super Bowl Pool Probability Question

    Hey we were trying (and failing) to calculate the odds of winning our super bowl pool at least twice based on the below info: There are 100...

    Started by Probs321‎, Yesterday 02:32 AM
    • Replies: 0
    • Views: 61
    Yesterday, 02:32 AM Go to last post
  3. Expected number of events in a simple birth-death process.

    I have a simple birth-death process with parameters, beta=4/5v and the initial population size is 6. I have calculated that the birth rate= 4/9 and...

    Started by C.Watt‎, 02-11-2016 05:38 AM
    gambler's ruin, probability, random walk
    • Replies: 0
    • Views: 84
    02-11-2016, 05:38 AM Go to last post
  4. Probability the First 2 chips are different colors

    Question: A bowl has three red and three blue chips. If two chips are randomly selected simultaneously, and then a third chip is selected, what is...

    Started by jrod‎, 02-10-2016 07:12 PM
    • Replies: 0
    • Views: 93
    02-10-2016, 07:12 PM Go to last post
  5. Poisson Process Exercise

    Hi everyone i'm new in this forum and i wanna ask if there someone that can help me with this kind of exercises in which i have an arrival process...

    Started by FreddyK‎, 02-10-2016 04:50 AM
    • Replies: 1
    • Views: 115
    02-10-2016, 08:41 AM Go to last post
  6. reading comprehention problem. would love your opinion

    so, i just had this test. and the solution for it has already been published. the thing is, i realy dont agree with their explenation for one of the...

    Started by ogry‎, 02-03-2016 03:59 AM
    • Replies: 1
    • Views: 249
    02-03-2016, 06:01 PM Go to last post
  7. Red face Combining two data sets using Bayesian methods

    Hi, I want to combine multiple data sets of customer spend data together. I want to calculate how the bounds of the data decrease as I add in more...

    Started by Snow64‎, 02-02-2016 11:18 PM
    bayesian, combining models
    • Replies: 0
    • Views: 127
    02-02-2016, 11:18 PM Go to last post
  8. Mann-Whitney U Test

    Hello everyone, Thank you all for providing and maintaining this forum. I'm currently working with two data sets collected ten months apart,...

    Started by Dash‎, 02-02-2016 07:59 AM
    • Replies: 3
    • Views: 152
    02-02-2016, 04:27 PM Go to last post
  9. Monte Carlo Assistance

    Hello, I have a monte carlo simulation built. Need assistance tweaking. Please reach out if interested. Tom

    Started by Butlertom‎, 02-01-2016 11:00 PM
    • Replies: 0
    • Views: 124
    02-01-2016, 11:00 PM Go to last post
  10. Probability that P > 0.1 of a population from a small sample

    Hey guys! I'm having an issue here with calculating the probably that the proportion of a population is larger 10% using data from a small sample....

    Started by Hublestat‎, 01-28-2016 11:21 AM
    • Replies: 8
    • Views: 293
    02-01-2016, 08:52 AM Go to last post
  11. Power of statistical test question help.

    Hello! this is my first time posting on the forum, i was wondering if anyone could help me with this problem that i have been working on for most of...

    Started by patombo321‎, 01-31-2016 11:19 PM
    • Replies: 0
    • Views: 113
    01-31-2016, 11:19 PM Go to last post
  12. Permutations with repeats in groups

    Hi guys, need help with the following question Permutation formula with repeats is as follows The number of different permutations of n objects,...

    Started by mateo‎, 01-30-2016 06:58 PM
    • Replies: 1
    • Views: 166
    01-31-2016, 03:22 AM Go to last post
  13. Question Assistance with probability problems before exam

    Hello, I am a student in International Trade and I have a Statistical exam tomorrow (in 12 hours to be precise). I would really need your help and...

    Started by Ninjahouse‎, 01-29-2016 03:20 PM
    • Replies: 0
    • Views: 160
    01-29-2016, 03:20 PM Go to last post
  14. Question Assistance with Probability example

    Consider a very simple card game, there are 16 cards. The cards have 4 ranks (Jack, King, Queen and Ace) and 4 suits (Clubs, Diamonds, Hearts and...

    Started by bensfriend1‎, 01-28-2016 07:02 AM
    • Replies: 0
    • Views: 112
    01-28-2016, 07:02 AM Go to last post
  15. Assistance with Monte Carlo Method for Board GAme

    Outcomes 16 cards. The cards have up to four values. I need assistance building a data set I can analyze. Simulating a starting hand, and...

    Started by Butlertom‎, 01-25-2016 08:18 PM
    • Replies: 5
    • Views: 311
    01-27-2016, 06:58 PM Go to last post
  16. Help Building Useful Normal Distribution Calculator

    I want to develop my own Normal Distribution calculator, to provide to a developer to perform a task within an app. I want a user with little...

    Started by JM Daddy‎, 01-27-2016 01:25 PM
    • Replies: 3
    • Views: 146
    01-27-2016, 05:14 PM Go to last post
  17. Deriving Probability Function from Non-Independent SubFunctions

    Howdy All, I attached a picture (inserted at bottom of post), to help explain what I'm trying to accomplish. In general, I don't need "the answer"...

    Started by some_random_dude‎, 01-26-2016 08:34 PM
    • Replies: 0
    • Views: 125
    01-26-2016, 08:34 PM Go to last post
  18. Bayesian serial chain

    I am trying to understand Bayesian networks and particularly causal (serial) chains. It is defined as P(C|A&B) = P(C|B).This means that the...

    Started by anuket‎, 01-23-2016 01:06 PM
    • Replies: 0
    • Views: 183
    01-23-2016, 01:06 PM Go to last post
  19. Bayesian formula with multiple events

    I am trying to predict next location of the user knowing his current (t) and previous location (t-1). I am trying to use Bayesian networks for this....

    Started by anuket‎, 01-23-2016 10:44 AM
    • Replies: 0
    • Views: 128
    01-23-2016, 10:44 AM Go to last post
  20. Post Probability for a CHi-square, normal, and binomial in Excel.

    Never mind...

    Started by Braam‎, 01-23-2016 07:29 AM
    • Replies: 0
    • Views: 119
    01-23-2016, 07:29 AM Go to last post
  21. Best To Draw First Or Last?

    Hi, newbie non mathematician looking for an answer to a long debated question in angling. When fishing a competition we draw a random number (say...

    Started by Neil of the Nene‎, 01-19-2016 05:47 AM
    • Replies: 5
    • Views: 360
    01-20-2016, 01:46 PM Go to last post
  22. Probability - Data Distribution

    Good day - I have a question. I have data set that follows a Weibull distrbution as follows: 9.15 + WEIB(0.827, 2.68) How can I translate this...

    Started by gtg430i‎, 01-19-2016 02:32 AM
    • Replies: 0
    • Views: 150
    01-19-2016, 02:32 AM Go to last post
  23. Interesting probability question I need help with...

    Hi all, new to the forum so please excuse any newbie traits I might have.. I have a question I need help with as I'm sure I'm missing something.....

    Started by TonyT1965‎, 01-18-2016 08:08 AM
    • Replies: 3
    • Views: 227
    01-18-2016, 08:27 PM Go to last post
  24. Change variable PDF with less variables than before

    My question is very simple, I have a probability density function that depends on four variables p(x1,x2,x3,x4). Now each of those variables depend...

    Started by f22rumaj‎, 01-18-2016 04:02 PM
    change, pdf, probability, variables
    • Replies: 0
    • Views: 154
    01-18-2016, 04:02 PM Go to last post
  25. System Response Time Alerts - Choosing a Statistical Method

    Hi It's been a long time since I had to use statistics in anger, so please bear with me. I have a test running that measures the response time of...

    Started by Custom24‎, 01-18-2016 02:05 PM
    • Replies: 1
    • Views: 167
    01-18-2016, 03:05 PM Go to last post
  26. POISSON distribution question

    Hey everybody, I'm working (struggling?) through a book about care logistics for my work. Sadly my background in statistics is rather limited. In...

    Started by MarcVP‎, 01-15-2016 06:32 AM
    • Replies: 2
    • Views: 215
    01-18-2016, 12:22 PM Go to last post
  27. P(Z<z), Z=X if X<=1, Z=Y+1 if X>1

    So here is the question X∼exp(1)X Y∼exp(2)Y (exponentialy distributed) X and y are independent. Z=Xif x≤1. Otherwise Z=Y+1. What is the...

    Started by ogry‎, 01-16-2016 01:46 AM
    • Replies: 2
    • Views: 235
    01-17-2016, 10:13 PM Go to last post
  28. How to develop probability formula?

    I am trying to come up with an approximate formula for the failure probability of an event which can be caused by four independent things. I have...

    Started by ejbrever‎, 01-17-2016 05:13 AM
    • Replies: 0
    • Views: 360
    01-17-2016, 05:13 AM Go to last post
  29. Lightbulb Conditional probability

    Hello, I'm having an issue with a problem. I just have no clue how to solve it. A machine part may be selected from any of three manufacturers...

    Started by dennissse‎, 01-16-2016 11:16 AM
    conditional, engineering, machine, probability, statistics
    • Replies: 2
    • Views: 285
    01-16-2016, 10:21 PM Go to last post
  30. Probability of Winning the Lottery vs. Being Struck by Lightning

    I operate a 100-person pool that plays the Powerball and Mega Millions lottery. I'm looking for a rational way to compare the odds of us winning a...

    Started by LouSander‎, 01-16-2016 11:52 AM
    • Replies: 0
    • Views: 148
    01-16-2016, 11:52 AM Go to last post
  31. Temporal synchronicities

    Hi, My cat died five days ago. The day after, when we buried him, I happened to look at my mobile phone at 17.17, 19.19, 21.21. On Tuesday I...

    Started by Sokal‎, 01-14-2016 09:27 AM
    probability, statistical, synchronicities, temporal, time
    • Replies: 0
    • Views: 150
    01-14-2016, 09:27 AM Go to last post
  32. Bivariate transformation?

    Hello, I'm having problem with a book question from statistical inference, Casella, Berger excercise 4.19 a). X_1 and X_2 are two i.i.d R.V -...

    Started by Talik‎, 01-11-2016 06:53 PM
    • Replies: 9
    • Views: 336
    01-11-2016, 08:37 PM Go to last post
  33. Probability Question

    Hi all, I have a question here. Say if we have 24 columns. Each column can take a hex number (0 to F). What is the probability that at...

    Started by pi3142‎, 01-11-2016 12:44 AM
    • Replies: 0
    • Views: 180
    01-11-2016, 12:44 AM Go to last post
  34. Lightbulb Quick Population / Media Prob question

    This is hopefully a fairly quick conditional probability question for you guys. Imagine a total population of 22MM people and I am running a...

    Started by 2biggie‎, 01-10-2016 12:47 PM
    media mix, probability, sample, survey analysis
    • Replies: 0
    • Views: 183
    01-10-2016, 12:47 PM Go to last post
  35. Easy probability question

    can anyone please help me with the easy probability question, "If there were 3062 people in a room and 90% of them had a red shirt on, 60% had jeans...

    Started by summerday‎, 01-08-2016 02:41 PM
    • Replies: 3
    • Views: 315
    01-08-2016, 10:18 PM Go to last post
  36. Help analyzing playoff predictions with my grandson

    My grandson is a huge football fan. His team, the Seattle Seahawks, made the playoffs. Sadly mine, the 49ers, didn't. The last 2 years, we have...

    Started by Jennifer Murphy‎, 01-08-2016 01:52 PM
    • Replies: 0
    • Views: 194
    01-08-2016, 01:52 PM Go to last post
  37. Is the Poisson probability distribution correctly applied to this problem?

    THE PROBLEM The transport company XYZ owns delivery trucks traveling back and forth along 1,000 miles of roads within a state, subdivided into 10...

    Started by Ariovistus‎, 01-07-2016 03:12 AM
    • Replies: 0
    • Views: 219
    01-07-2016, 03:12 AM Go to last post
  38. Looking forward answer about module work

    (i) The air in a “clean room” used for the production of electronic devices is cleaned by filtering. The air on the outside of the filters is...

    Started by Mocha‎, 01-03-2016 04:06 PM
    • Replies: 1
    • Views: 892
    01-03-2016, 04:08 PM Go to last post
  39. Question about SD

    Just want to check whether i undertsand something about SD correctly. Am i right in thinking that generally as a sample size increases, its SD...

    Started by Prometheus‎, 12-24-2015 10:34 AM
    • Replies: 3
    • Views: 463
    01-01-2016, 07:40 AM Go to last post
  40. Help with beginner probability problem?

    Hi, I saw this probability question today and I don't understand how the answer was derived. It was about independent events. Could someone...

    Started by tsims25‎, 12-31-2015 05:24 PM
    • Replies: 4
    • Views: 364
    12-31-2015, 06:59 PM Go to last post
  41. Probability: Sampling to find defects

    Hi, I'm new to the site. We discovered that a process is resulting in a defect rate of 14% for some batches. Each batch of product contains 2,500...

    Started by Joerice‎, 12-30-2015 07:44 AM
    • Replies: 3
    • Views: 345
    12-31-2015, 07:38 AM Go to last post
  42. (Bayesian) Frequency and Likelihood Ratio Substitution

    I've been trying to learn Bayesian statistics "on my own" and part of how I study is by reading on its application in Court. Recently I've been...

    Started by Sakurabe‎, 12-26-2015 04:15 AM
    • Replies: 1
    • Views: 342
    12-26-2015, 05:54 AM Go to last post
  43. Frequency of Exceedance, Paired Data, and Cumulative Frequency

    Hello, I am working on an analysis problem that I was hoping folks could provide feedback on. I have a paired timeseries dataset (groups A and...

    Started by Chris009‎, 12-23-2015 05:00 PM
    • Replies: 0
    • Views: 341
    12-23-2015, 05:00 PM Go to last post
  44. Question Probability of winning a jackpot

    Hi, i'm new here. I was wondering whats the probability of wining a football prediction jackpot with a win draw or loose options in 13 games...

    Started by cedriclol‎, 12-21-2015 05:29 AM
    • Replies: 1
    • Views: 302
    12-22-2015, 05:31 PM Go to last post
  45. Probability Function Help

    During my college days, I used my statistics classes to help me understand the probabilities of various roleplaying games, including Vampire, the...

    Started by BenjCano‎, 12-22-2015 11:29 AM
    • Replies: 0
    • Views: 213
    12-22-2015, 11:29 AM Go to last post
  46. Employee commuting question

    It takes an average weekday commute of 39 minutes with a Standard Deviation of 7 minutes for the employees to get to work when they use their...

    Started by acalm‎, 12-22-2015 10:20 AM
    • Replies: 1
    • Views: 166
    12-22-2015, 10:35 AM Go to last post
  47. Maximum probability in a grid

    Hi, this is my first post, so hello! My problem (and my question) is how can I either express the probabilities calculated below as the...

    Started by breakeven‎, 12-21-2015 06:04 AM
    • Replies: 0
    • Views: 231
    12-21-2015, 06:04 AM Go to last post
  48. Inferring the Number of Sides of a Fair Die

    Hello, Suppose that Alice has a fair die with N sides, labelled 1..N. Only Alice knows N, and Alice won't tell N to anyone else. However, you may...

    Started by spitzi‎, 12-20-2015 08:32 AM
    • Replies: 1
    • Views: 262
    12-21-2015, 02:21 AM Go to last post
  49. Gender and birth year

    Okay this is probably simple but I'm wanting to verify. A co-worker's wife is pregnant with their 8th baby (yeah. It's a lot) and we are all betting...

    Started by Pr262‎, 12-19-2015 02:22 AM
    • Replies: 2
    • Views: 331
    12-19-2015, 10:46 AM Go to last post
  50. Quantitative report

    Am stuck with on the following question, anyone that can please help. An oil company is considering whether or not to bid for an offshore &Wing...

    Started by kazu1‎, 12-17-2015 04:42 PM
    • Replies: 2
    • Views: 276
    12-18-2015, 03:20 AM Go to last post
  51. Expected return

    Hello, it has been a couple years since my last statistics course and i need help with a report i am compiling for work. I have a list of 500 or so...

    Started by moorenr‎, 12-16-2015 07:49 PM
    • Replies: 0
    • Views: 260
    12-16-2015, 07:49 PM Go to last post
  52. Conditional Probability

    http://i.imgur.com/9UELFY5.png Here is the problem in question. I have the answers for both of these already,but I am not sure I have 2b correct. ...

    Started by StatScareMe‎, 12-14-2015 04:09 PM
    • Replies: 5
    • Views: 307
    12-14-2015, 05:18 PM Go to last post
  53. Normal Distribution

    Suppose that in an apartment building run by the Probandstat rental company, the inhabitants's weights follow a normal distribution with mean 73.0...

    Started by adnan86‎, 12-13-2015 09:36 AM
    normal distribution, probability
    • Replies: 1
    • Views: 299
    12-13-2015, 12:10 PM Go to last post
  54. Probability and Averages

    The prompt is this. "The prices of power tools manufactured by Whammo are known to be normally distributed with a mean of $1200 and a standard...

    Started by expendabull‎, 12-11-2015 05:05 PM
    average probability.
    • Replies: 1
    • Views: 308
    12-11-2015, 09:38 PM Go to last post
  55. Sampling distribution of the sample proportion.

    A random sample of 20 students is selected. What is the probability that the sample proportion exceeds 75%, i.e., more than 15 students (out of 20...

    Started by amrhamada‎, 12-11-2015 09:02 PM
    binomial distribution, sample, sample distribution
    • Replies: 1
    • Views: 229
    12-11-2015, 09:12 PM Go to last post
  56. Probability of a Poisson Distribution without t given problem

    This is on my final exam study guide for statistics. I have absolutely no idea how to do it Problem 1: Valerie Variance is taking her "no-time...

    Started by kepowel2‎, 12-06-2015 10:25 AM
    help needed, poisson distribution, problem, variance
    • Replies: 1
    • Views: 355
    12-06-2015, 02:01 PM Go to last post
  57. expectation of number of streaks

    Ok so i have this question and i dont even knownwhere to begin. An unfair coin with the probability of p to get a head is tossed n times. (n>6). A...

    Started by ogry‎, 12-03-2015 02:36 PM
    • Replies: 6
    • Views: 506
    12-04-2015, 11:58 PM Go to last post
  58. Probability of an event occurring 5 times??

    Hi all I have recently placed a bet with a bookmaker concerning the number of days Sydney will exceed 35C in summer. Summer has 90 days and the...

    Started by tomtankman‎, 12-03-2015 05:13 PM
    • Replies: 3
    • Views: 442
    12-04-2015, 04:53 AM Go to last post
  59. Smile Three (or more) normally distributed variables

    Hi I have three variables, X, Y and Z with all different means but same standard deviation. All are normally distributed. It could be four in some...

    Started by samot79‎, 12-03-2015 02:52 PM
    • Replies: 3
    • Views: 323
    12-03-2015, 04:18 PM Go to last post
  60. Finding probability from Moment Generating Functions

    I am stuck on part 3 of this question. I am given the following moment generating function mx(t) e^(4e^t-4) 1) identify the distribution and...

    Started by petenice‎, 12-02-2015 05:44 PM
    • Replies: 2
    • Views: 340
    12-02-2015, 06:34 PM Go to last post

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