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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: 31,151
    09-30-2005, 09:44 AM Go to last post
  1. The Expectation of a Majority random process

    I want to know the answer of the following question, I will be so thankful if somebody gives me some clues: "We start a random process with Nb blue...

    Started by Ahad_ie2000‎, 03-14-2016 04:50 AM
    • Replies: 1
    • Views: 1,437
    03-15-2016, 10:41 PM Go to last post
  2. Probability of most expensive item automatically being purchased

    Hi all, many thanks for any input on this perplexing problem: If a sporting good store offers a coupon as follows: Free soccer ball OR free...

    Started by DoubleoJosh‎, 03-12-2016 09:55 AM
    probability, purchase
    • Replies: 0
    • Views: 1,268
    03-12-2016, 09:55 AM Go to last post
  3. Why doesent MLE equal in normal distribution when mean = variance?

    Sadly Im not familiar with LaTex so I have attached my question as a picture. I have tried the best I can, but now Im stuck :(

    Started by pmle‎, 03-10-2016 11:47 AM
    • Replies: 11
    • Views: 1,942
    03-12-2016, 01:24 AM Go to last post
  4. Please I need help with those probability problems

    Please help me, I will really appreciate it! 1) You are dealing a standard hand of 5 card stud, 1 card face down, 4 face up. Ignoring the cards...

    Started by Paolo98‎, 03-07-2016 08:37 PM
    • Replies: 3
    • Views: 1,631
    03-10-2016, 03:12 PM Go to last post
  5. Golf Scores

    Yesterday my buddy and I both shot 84, 12 over par. But although we had the same gross scores we noticed that we did not tie any single hole. ...

    Started by Jonart‎, 02-07-2015 11:46 AM
    • Replies: 4
    • Views: 2,261
    03-08-2016, 08:29 AM Go to last post
  6. Question Probability for Dice Game

    Hi, im programming a little dice game (Android&Windows). As you can see on the screenshot i have 9 dice (right). The objective of the game is to...

    Started by Sakati‎, 03-03-2016 09:40 AM
    • Replies: 10
    • Views: 3,372
    03-07-2016, 09:27 AM Go to last post
  7. Normal Law

    Hi there will be very greatfull if anyone can help: If X represent the daily yield of the S&P500(US Stock indices) and Y represent the daily yield...

    Started by mikoko‎, 03-03-2016 08:35 AM
    • Replies: 3
    • Views: 2,303
    03-07-2016, 06:25 AM Go to last post
  8. Question Manufacturing machine probability problem

    There are three possible environment conditions: normal, rainy and hot. Rainy and hot days may be risky to a system that has been deployed, but...

    Started by deathlives‎, 03-04-2016 10:36 PM
    exam, probability, random
    • Replies: 5
    • Views: 3,426
    03-06-2016, 02:29 AM Go to last post
  9. Need to determine the probability

    In a call center 180 calls are received at random over a period of 12 hours. Then the probability to receive calls between 180 to 200 every 12 hours...

    Started by earnestat‎, 03-05-2016 06:44 AM
    • Replies: 1
    • Views: 2,490
    03-05-2016, 04:45 PM Go to last post
  10. Probability of opposite of mean

    I am trying to calculate the probability of reverse preferences for an outcome. I have the mean and standard deviation of the predicted outcome, how...

    Started by Puffin‎, 03-02-2016 08:52 AM
    • Replies: 5
    • Views: 2,027
    03-03-2016, 07:12 AM Go to last post
  11. Analytic form for the quadrant probability of a (standard) bivariate t distribution?

    hellows! i may need this further along my manuscript and quick google searches aren't really being helpful, so maybe someone around here knows. ...

    Started by spunky‎, 02-22-2016 03:06 PM
    • Replies: 4
    • Views: 2,341
    03-01-2016, 11:01 PM Go to last post
  12. Thumbs up Excel Simulation (Monte Carlo) help

    Hi all, I've been racking my non-statistical brain on my Excel simulation (monte carlo sim predicts profit). I have created the model and as I...

    Started by BrentCOS‎, 03-01-2016 07:39 PM
    excel, monte carlo, simulation
    • Replies: 3
    • Views: 2,373
    03-01-2016, 10:20 PM Go to last post
  13. Help with this permutation problem?

    Hi! So I'm struggling with a lot of things in probability, and one being permutations and finding them. There's a problem, and if I know how to...

    Started by ROCKaholic‎, 02-26-2016 08:07 PM
    • Replies: 3
    • Views: 1,066
    02-28-2016, 02:15 AM Go to last post
  14. Probability Scenario

    Heres the scenario: A committee of 9 people is deciding which 5 people of 14 candidates should be hired for a job. In order to be hired, a...

    Started by CORWU671‎, 02-23-2016 10:14 AM
    • Replies: 4
    • Views: 1,862
    02-25-2016, 07:02 PM Go to last post
  15. Probability question

    Let's say we have 60 balls of which 17 are red and the rest black. If I pick 7 balls at random, what is the probability that i picked at least 3 red...

    Started by spisi‎, 02-23-2016 07:03 PM
    • Replies: 5
    • Views: 1,466
    02-25-2016, 02:32 PM Go to last post
  16. Distribution of p-values

    Hello By way of some background, I have a data set with 160 observations. Each observation is a patient and the variable of interest is the...

    Started by scotchpie‎, 02-23-2016 08:45 AM
    • Replies: 2
    • Views: 1,238
    02-24-2016, 04:57 AM Go to last post
  17. How to calculate the odds that Team A will beat Team B given their records to date?

    I would like to find a formula to calculate the probability that Team A will beat Team B taking into account just their records to date. For...

    Started by Jennifer Murphy‎, 02-20-2016 01:05 AM
    • Replies: 5
    • Views: 3,719
    02-23-2016, 02:16 PM Go to last post
  18. adding distributions

    Hello, I have a discrete distribution: with a chance of a delay (in hours) I came out of 80 000 measurements to a table with max 40 h delay and...

    Started by thomask‎, 02-22-2016 02:55 AM
    • Replies: 2
    • Views: 1,109
    02-22-2016, 10:09 AM Go to last post
  19. Hypergeometric Distribution

    For part (b), the solution is from the textbook solution from the book. k = 1, so why did they set it up like that? Look at the image to see what I...

    Started by asilvester635‎, 02-21-2016 03:14 PM
    • Replies: 2
    • Views: 1,310
    02-22-2016, 02:13 AM Go to last post
  20. Scoring at least once out of ten attempts

    A football player has the chance of 0.14 to score (single kick). If he kicks the ball 10 times, what is his chance of scoring at least once? Can...

    Started by Assaf‎, 02-20-2016 10:00 AM
    coin flips, cumulative probability, distributation
    • Replies: 3
    • Views: 1,823
    02-20-2016, 05:28 PM Go to last post
  21. Are the following events independent or dependent?

    I asked the following question in an exam. I can argue both ways, but I am very interested in any further thoughts. ---------------- Are the...

    Started by jgaleach‎, 02-18-2016 11:31 AM
    dependent, independent, probability
    • Replies: 2
    • Views: 2,164
    02-18-2016, 11:54 AM Go to last post
  22. Estimating probability of malignancy in skin moles

    If a certain type of skin mole has 1% probability of malignant change over a lifetime, what is the probability of malignant change if a person has...

    Started by Ronald U.‎, 02-16-2016 04:28 PM
    • Replies: 8
    • Views: 1,704
    02-17-2016, 04:38 PM Go to last post
  23. Confidence intervals for proportions: approximating a discrete distribution with a co

    I saw on this website http://onlinestatbook.com/2/estimation/proportion_ci.html The following quote about calculating a CI for a proportion: ...

    Started by trinker‎, 02-16-2016 12:32 AM
    confidence interval, proportion
    • Replies: 3
    • Views: 1,771
    02-16-2016, 03:48 PM Go to last post
  24. Finding Joint Posterior Density of Poisson and Exp?

    Hi, Some friends and I have been stuck on this bayesian stats question for five days now, please shed some light if you can :wave: We've tried to...

    Started by nemeiyu‎, 02-16-2016 02:03 PM
    bayesian, density, posterior, probability, stats
    • Replies: 0
    • Views: 1,601
    02-16-2016, 02:03 PM Go to last post
  25. Cool Coin and die probability

    If I repeatedly and alternately toss a coin and roll a 6 sided die beginning with the coin what is probability of getting a head before a 6

    Started by Birdkid2‎, 02-14-2016 05:09 PM
    • Replies: 6
    • Views: 1,563
    02-16-2016, 01:38 PM Go to last post
  26. Support of a Distribution?

    Does the support of a distribution change? For example lets say Y~Beta(20,30) the support is from 0 to . However what would the support be for 3Y+2?...

    Started by Blueberrybunny‎, 02-14-2016 05:20 PM
    • Replies: 2
    • Views: 1,361
    02-14-2016, 05:33 PM Go to last post
  27. 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: 1,744
    02-12-2016, 03:37 AM Go to last post
  28. 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: 2,399
    02-11-2016, 05:38 AM Go to last post
  29. 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: 1,263
    02-10-2016, 07:12 PM Go to last post
  30. 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: 2,393
    02-10-2016, 08:41 AM Go to last post
  31. 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: 1,370
    02-03-2016, 06:01 PM Go to last post
  32. 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: 924
    02-02-2016, 11:18 PM Go to last post
  33. 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: 1,159
    02-02-2016, 04:27 PM Go to last post
  34. 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: 1,476
    02-01-2016, 11:00 PM Go to last post
  35. 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: 2,333
    02-01-2016, 08:52 AM Go to last post
  36. 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: 1,189
    01-31-2016, 11:19 PM Go to last post
  37. 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: 1,832
    01-31-2016, 03:22 AM Go to last post
  38. 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: 1,114
    01-29-2016, 03:20 PM Go to last post
  39. 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: 1,148
    01-28-2016, 07:02 AM Go to last post
  40. 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: 2,148
    01-27-2016, 06:58 PM Go to last post
  41. 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: 1,352
    01-27-2016, 05:14 PM Go to last post
  42. 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: 1,303
    01-26-2016, 08:34 PM Go to last post
  43. 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: 1,503
    01-23-2016, 01:06 PM Go to last post
  44. 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: 1,251
    01-23-2016, 10:44 AM Go to last post
  45. 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: 1,150
    01-23-2016, 07:29 AM Go to last post
  46. 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: 2,244
    01-20-2016, 01:46 PM Go to last post
  47. 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: 1,530
    01-19-2016, 02:32 AM Go to last post
  48. 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: 1,085
    01-18-2016, 08:27 PM Go to last post
  49. 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: 1,182
    01-18-2016, 04:02 PM Go to last post
  50. 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: 1,520
    01-18-2016, 03:05 PM Go to last post
  51. 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: 1,555
    01-18-2016, 12:22 PM Go to last post
  52. 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: 1,166
    01-17-2016, 10:13 PM Go to last post
  53. 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: 1,515
    01-17-2016, 05:13 AM Go to last post
  54. 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: 2,058
    01-16-2016, 10:21 PM Go to last post
  55. 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: 1,201
    01-16-2016, 11:52 AM Go to last post
  56. 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: 1,092
    01-14-2016, 09:27 AM Go to last post
  57. 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: 1,820
    01-11-2016, 08:37 PM Go to last post
  58. 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: 1,116
    01-11-2016, 12:44 AM Go to last post
  59. 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: 1,222
    01-10-2016, 12:47 PM Go to last post
  60. 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: 1,931
    01-08-2016, 10:18 PM Go to last post

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