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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: 15,560
    09-30-2005, 09:44 AM Go to last post
  1. Dice probability question

    What are the odds of rolling 2d6(2 6-sided dice) three times and getting two 3s? How about rolling 4 times; 5 times? I know rolling a 2d6 has a...

    Started by CBOR‎, Yesterday 12:34 PM
    dice, probability
    • Replies: 1
    • Views: 44
    Yesterday, 01:36 PM Go to last post
  2. The random variable and Probability. 2 problems

    Hi, can anyone help me out with these 2 problems? Sorry for language mistakes, translated from German.

    Started by kagokina88‎, Yesterday 05:26 AM
    • Replies: 1
    • Views: 54
    Yesterday, 11:52 AM Go to last post
  3. Probability question

    I recently stumbled up on this question. Need help in solving this. N balls thrown at N baskets, what is the chance that a random basket will have...

    Started by sunragav‎, 04-27-2016 02:07 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 290
    Yesterday, 11:41 AM Go to last post
  4. should bayes therom be used?

    Seems like a relatively simple question, but I'm missing it: There are 25 delinquent accounts in 100 accounts. If I choose 75 accounts out of the...

    Started by auditor‎, 04-27-2016 09:31 PM
    • Replies: 0
    • Views: 61
    04-27-2016, 09:31 PM Go to last post
  5. Probability Of insurance sales

    Just a disclaimer I know I am omitting important factors such as competition, earned premium etc etc. I'm just using this exercise so I can start...

    Started by semidevil‎, 04-21-2016 12:38 PM
    • Replies: 7
    • Views: 346
    04-26-2016, 02:50 PM Go to last post
  6. Normal distribution

    Hi all, I'm generating a random normal distribution and i don't control the mu and sigma (its a matlab function that i need to use because the...

    Started by Evyatar‎, 04-25-2016 09:10 AM
    mean 1, normal distribution, random, sigma, std
    • Replies: 2
    • Views: 121
    04-26-2016, 01:31 AM Go to last post
  7. Geometric Mean and SD into Normal Curve

    Hi I'm working with a data set of historical return on a particular investment. I have 556 consecutive monthly price values, and i used those to...

    Started by superfro123‎, 04-25-2016 09:38 AM
    • Replies: 0
    • Views: 71
    04-25-2016, 09:38 AM Go to last post
  8. Probability of having "Best Qualified" applicants in a subset of the entire pool

    Probability of having "Best Qualified" applicants in a subset of the entire pool. I am working on an issue, trying to show whether or not an HR...

    Started by Smangold‎, 04-25-2016 12:47 AM
    • Replies: 0
    • Views: 92
    04-25-2016, 12:47 AM Go to last post
  9. Not understanding the posterior distribution result

    So I cam across this question http://pages.pomona.edu/~jsh04747/courses/math152/wu2_f07.pdf I understand majority of it, except the line ξ(θ|x). I...

    Started by k.dot‎, 04-22-2016 07:31 PM
    • Replies: 1
    • Views: 148
    04-22-2016, 08:56 PM Go to last post
  10. Post a low correlation and a strong significance = can the null hypothesis be rejected?

    I have found that there is a very low negative correlation (r= - 0.17) with strong significance (p<0.0001) between A test and B test. The null...

    Started by emma13‎, 04-21-2016 10:42 AM
    • Replies: 7
    • Views: 327
    04-22-2016, 09:07 AM Go to last post
  11. Engineering Failure Analysis

    I'm currently writing a report in which I would like to discuss the potential for failure of several pipelines. If the chance of failure per pipeline...

    Started by eschertz‎, 04-20-2016 02:27 PM
    • Replies: 1
    • Views: 124
    04-20-2016, 02:58 PM Go to last post
  12. synthetic data (poisson)

    Hello I'm trying to get a grip of generating synthetic data but I'm having some difficulties ? Following Hilbe2010...

    Started by oharman‎, 04-19-2016 05:57 AM
    • Replies: 0
    • Views: 135
    04-19-2016, 05:57 AM Go to last post
  13. Question Compound Distribution Hyper-Parameters

    Hi, If a compound distribution is made up of a gamma dist with parameters (a,b), and b is gamma-distributed so that its parameters are (c,d), such...

    Started by Snow64‎, 04-17-2016 06:42 PM
    distribution function, likelihhod function., optimization
    • Replies: 1
    • Views: 178
    04-18-2016, 01:57 AM Go to last post
  14. Sampling with replacement - probability problem

    Hi all, (this is my first post, hopefully I am not breaking any rules). I have the following problem that I cannot solve: I have a set of...

    Started by Bep75‎, 04-15-2016 01:06 PM
    • Replies: 6
    • Views: 279
    04-17-2016, 03:02 PM Go to last post
  15. Express similarity measure in terms of probability

    Hi, I have an image called 'source.png'. And a set (lets call it set-1) of images called 'target-i.png' (where i:1-10). I need to find which of...

    Started by aryabhatta‎, 04-15-2016 05:58 PM
    • Replies: 0
    • Views: 170
    04-15-2016, 05:58 PM Go to last post
  16. conditional probability question

    I'm having trouble with the following problem: I want to know P(X>C | W>C) with C a known fixed constant, X and W both normally distributed...

    Started by Alex C‎, 04-15-2016 10:28 AM
    • Replies: 0
    • Views: 93
    04-15-2016, 10:28 AM Go to last post
  17. Advantages of having population-defined parameters?

    Hello peeps. Quick “conceptual”/weird question. While finishing-up my next manuscript, I started thinking that a way to “buff it up” would be to talk...

    Started by spunky‎, 04-14-2016 03:06 PM
    • Replies: 1
    • Views: 137
    04-14-2016, 06:06 PM Go to last post
  18. How do I test binomial data?

    Good Afternoon, I have what I assume will be an easy question for all those more statistically minded than myself. Say I have done an...

    Started by SiobhanRoisin‎, 04-14-2016 09:09 AM
    • Replies: 2
    • Views: 134
    04-14-2016, 02:23 PM Go to last post
  19. Probability of getting a certain card game hand combo

    Trying to figure out the chance of getting a certain combination of cards in a card game. This is related to Magic: The Gathering if that matters. ...

    Started by dctrombly‎, 04-13-2016 11:31 PM
    • Replies: 0
    • Views: 107
    04-13-2016, 11:31 PM Go to last post
  20. Probability and Efficiency

    I have a probability question I am looking for some help with. In the scenario I perform a task on an object. I will either succeed or fail....

    Started by braeden‎, 04-13-2016 10:31 AM
    • Replies: 0
    • Views: 95
    04-13-2016, 10:31 AM Go to last post
  21. Lightbulb Have the mean, standard deviation and probability...but something seems off!

    hi all! So I am taking a Quantitative methods class for my MBA and we are just getting started, so I am somewhat overwhelmed. I am taking the...

    Started by sophie0816‎, 04-10-2016 07:51 PM
    • Replies: 1
    • Views: 231
    04-11-2016, 06:19 AM Go to last post
  22. Find E(X) and VAR (X)

    Question is: There is one error in one of five blocks of program. To find the error, we test three randomly selected blocks. Let X be the number of...

    Started by smske‎, 01-15-2012 07:21 AM
    • Replies: 10
    • Views: 15,546
    04-10-2016, 03:54 AM Go to last post
  23. Basic Probability Question

    Hi, could anyone point out the methodology I should use the answer the question below? Your wisdom is much appreciated! Question: "Between...

    Started by ShareTheGlobe‎, 04-10-2016 03:31 AM
    • Replies: 0
    • Views: 132
    04-10-2016, 03:31 AM Go to last post
  24. Another game designer dice question...

    Firstly I want to introduce myself. My name is Daniel and I am a game designer (http://www.hazardgaming.com) when I'm not teaching mathematics. I can...

    Started by hazard‎, 03-08-2016 09:20 PM
    • Replies: 9
    • Views: 802
    04-09-2016, 09:53 AM Go to last post
  25. Unhappy Hypothesis Testing with proportions

    Calculate and interpret the Z-scores to test significant difference between the proportion of rates of dementia between a. 30-49 year-old US men...

    Started by delaney‎, 04-07-2016 04:30 PM
    • Replies: 0
    • Views: 183
    04-07-2016, 04:30 PM Go to last post
  26. Markov hitprobabilities

    Hey I have to find the equilibrium path in a dynamic directed stochastic game. The equilibrium path are the set of state space points with positive...

    Started by JesperHP‎, 04-07-2016 02:30 PM
    • Replies: 0
    • Views: 148
    04-07-2016, 02:30 PM Go to last post
  27. Coin flip explanation

    Hi, I have been wondering about a probability question. Suppose you have a 50% chance of winning $1 when you flip a coin. You also have a 50%...

    Started by numbersman‎, 04-06-2016 02:50 AM
    • Replies: 1
    • Views: 214
    04-06-2016, 04:07 AM Go to last post
  28. Probability

    Hello! I will appreciate if anyone can help me with this problem. Thank you!:) 40% of vacationers going to rocky mt. region visit yellowstone...

    Started by LadyBoss77‎, 03-30-2016 03:41 AM
    • Replies: 2
    • Views: 379
    03-31-2016, 11:26 PM Go to last post
  29. Probability question

    Out of 12 people in a room, what is the probability that no 2 different people has birthday at the same month?

    Started by Eyal8‎, 03-23-2016 04:20 PM
    • Replies: 1
    • Views: 243
    03-23-2016, 04:24 PM Go to last post
  30. bayes's theorem and conditional probability question

    chat **** get banged

    Started by shazooby‎, 03-22-2016 10:51 AM
    bayes' theorem, conditional probabilities, probability
    • Replies: 2
    • Views: 348
    03-23-2016, 01:43 PM Go to last post
  31. Dice probability with limited reroll

    Hello, I'm having difficulty understanding this problem and I was wondering if someone had an answer. Let n = \text{Number of dice} = 3 p_s...

    Started by Dan K‎, 03-20-2016 06:26 PM
    dice, probability
    • Replies: 2
    • Views: 430
    03-23-2016, 12:13 PM Go to last post
  32. Show, by calculation, that the mean of y doesn't exist

    This is one of my questions for my homework, I have attached a copy of the function and also my attempt, I'm not sure if I've done it right. And if I...

    Started by k.dot‎, 03-20-2016 07:08 AM
    • Replies: 5
    • Views: 350
    03-21-2016, 07:35 PM Go to last post
  33. Need help with some Statistics Questions

    In a certain population, 18% of the people have Rh-negative blood. A blood bank serving this population receives 95 blood donors on a particular day....

    Started by surajthemighty‎, 03-13-2016 11:50 PM
    • Replies: 1
    • Views: 451
    03-21-2016, 04:55 PM Go to last post
  34. Post statistics and probability question

    Winnipeg has three professional sports teams - the Winnipeg Jets hockey team, the Winnipeg Blue Bombers football team and the Winnipeg Goldeyes...

    Started by rsniper007‎, 03-17-2016 08:10 PM
    • Replies: 1
    • Views: 271
    03-17-2016, 08:12 PM Go to last post
  35. Question What is the probability of this improbable event?

    Hello all, Let's suppose that we are given 6 chances to draw for two specific numbers. (Though perhaps that 6 chances doesn't really matter?) Let's...

    Started by Kp83‎, 03-16-2016 09:18 PM
    • Replies: 1
    • Views: 263
    03-17-2016, 09:40 AM Go to last post
  36. Conditional probability

    I am consideriing the following identities: p(s' \lvert s,a) = p(x'_1,x'_2,c' \lvert x_1,x_2,c,a_1,a_2) = \pi(c'\lvert c)p(x'_2 \lvert...

    Started by JesperHP‎, 03-16-2016 06:14 PM
    • Replies: 0
    • Views: 169
    03-16-2016, 06:14 PM Go to last post
  37. Special Multiplication Rule

    Hey I was reading some basic probability problems from my Intro Stats book and thought of a problem to test if I understand it correctly. ...

    Started by StilloftheNight‎, 03-16-2016 02:10 AM
    • Replies: 0
    • Views: 170
    03-16-2016, 02:10 AM Go to last post
  38. 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: 212
    03-15-2016, 10:41 PM Go to last post
  39. 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 08:55 AM
    probability, purchase
    • Replies: 0
    • Views: 198
    03-12-2016, 08:55 AM Go to last post
  40. Why doesent MLE equal in normal distribution when mean = variance?

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

    Started by pmle‎, 03-10-2016 10:47 AM
    • Replies: 11
    • Views: 439
    03-12-2016, 12:24 AM Go to last post
  41. 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 07:37 PM
    • Replies: 3
    • Views: 338
    03-10-2016, 02:12 PM Go to last post
  42. 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 10:46 AM
    • Replies: 4
    • Views: 722
    03-08-2016, 07:29 AM Go to last post
  43. Question Probability for Dice Game

    Hi, i´m 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 08:40 AM
    • Replies: 10
    • Views: 636
    03-07-2016, 08:27 AM Go to last post
  44. 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 07:35 AM
    • Replies: 3
    • Views: 337
    03-07-2016, 05:25 AM Go to last post
  45. 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 09:36 PM
    exam, probability, random
    • Replies: 5
    • Views: 445
    03-06-2016, 01:29 AM Go to last post
  46. 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 05:44 AM
    • Replies: 1
    • Views: 276
    03-05-2016, 03:45 PM Go to last post
  47. 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 07:52 AM
    • Replies: 5
    • Views: 352
    03-03-2016, 06:12 AM Go to last post
  48. 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 02:06 PM
    • Replies: 4
    • Views: 430
    03-01-2016, 10:01 PM Go to last post
  49. 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 06:39 PM
    excel, monte carlo, simulation
    • Replies: 3
    • Views: 301
    03-01-2016, 09:20 PM Go to last post
  50. 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 07:07 PM
    • Replies: 3
    • Views: 362
    02-28-2016, 01:15 AM Go to last post
  51. Probability Scenario

    Here’s 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 09:14 AM
    • Replies: 4
    • Views: 388
    02-25-2016, 06:02 PM Go to last post
  52. 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 06:03 PM
    • Replies: 5
    • Views: 398
    02-25-2016, 01:32 PM Go to last post
  53. 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 07:45 AM
    • Replies: 2
    • Views: 303
    02-24-2016, 03:57 AM Go to last post
  54. 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 12:05 AM
    • Replies: 5
    • Views: 405
    02-23-2016, 01:16 PM Go to last post
  55. 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 01:55 AM
    • Replies: 2
    • Views: 209
    02-22-2016, 09:09 AM Go to last post
  56. 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 02:14 PM
    • Replies: 2
    • Views: 237
    02-22-2016, 01:13 AM Go to last post
  57. 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 09:00 AM
    coin flips, cumulative probability, distributation
    • Replies: 3
    • Views: 328
    02-20-2016, 04:28 PM Go to last post
  58. 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 10:31 AM
    dependent, independent, probability
    • Replies: 2
    • Views: 286
    02-18-2016, 10:54 AM Go to last post
  59. 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 03:28 PM
    • Replies: 8
    • Views: 426
    02-17-2016, 03:38 PM Go to last post
  60. 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, 02-15-2016 11:32 PM
    confidence interval, proportion
    • Replies: 3
    • Views: 285
    02-16-2016, 02:48 PM Go to last post

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