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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: 31,138
    09-30-2005, 09:44 AM Go to last post
  1. 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: 1,086
    01-08-2016, 01:52 PM Go to last post
  2. 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: 1,020
    01-07-2016, 03:12 AM Go to last post
  3. 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: 4,049
    01-03-2016, 04:08 PM Go to last post
  4. 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: 1,937
    01-01-2016, 07:40 AM Go to last post
  5. 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
    probability
    • Replies: 4
    • Views: 1,860
    12-31-2015, 06:59 PM Go to last post
  6. 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: 1,900
    12-31-2015, 07:38 AM Go to last post
  7. (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: 1,895
    12-26-2015, 05:54 AM Go to last post
  8. 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: 1,182
    12-23-2015, 05:00 PM Go to last post
  9. 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: 1,844
    12-22-2015, 05:31 PM Go to last post
  10. 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: 1,207
    12-22-2015, 11:29 AM Go to last post
  11. 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: 1,739
    12-22-2015, 10:35 AM Go to last post
  12. 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: 2,278
    12-21-2015, 06:04 AM Go to last post
  13. 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: 2,834
    12-21-2015, 02:21 AM Go to last post
  14. 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: 4,181
    12-19-2015, 10:46 AM Go to last post
  15. 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: 1,566
    12-18-2015, 03:20 AM Go to last post
  16. 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: 1,353
    12-16-2015, 07:49 PM Go to last post
  17. 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: 1,240
    12-14-2015, 05:18 PM Go to last post
  18. 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: 1,060
    12-13-2015, 12:10 PM Go to last post
  19. 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: 1,595
    12-11-2015, 09:38 PM Go to last post
  20. 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: 1,473
    12-11-2015, 09:12 PM Go to last post
  21. 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: 1,491
    12-06-2015, 02:01 PM Go to last post
  22. 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: 2,844
    12-04-2015, 11:58 PM Go to last post
  23. 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: 2,150
    12-04-2015, 04:53 AM Go to last post
  24. 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: 1,526
    12-03-2015, 04:18 PM Go to last post
  25. 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: 1,316
    12-02-2015, 06:34 PM Go to last post
  26. bayesian statistics

    I have a large amount of data, given totals for every hour over a year period for the following columns: # of Jams Jam event time in minutes # of...

    Started by bigshottkyd‎, 12-01-2015 01:23 PM
    bayes, bayesian, probability, regression
    • Replies: 0
    • Views: 1,321
    12-01-2015, 01:23 PM Go to last post
  27. Expectation of random variable

    Hey guys, I have stumbled upon this problem, and I've tried solving it by looking at it as a Binomial distribution, but i just don't see the right...

    Started by mystery‎, 11-25-2015 12:40 PM
    • Replies: 1
    • Views: 3,009
    11-25-2015, 11:06 PM Go to last post
  28. Probability of seeing the same token number

    Hello, This is well beyond my understanding and I am hoping there is someone out there that can help. I have looked on the forum for an answer but...

    Started by Wrenchie‎, 11-25-2015 08:08 AM
    • Replies: 0
    • Views: 1,636
    11-25-2015, 08:08 AM Go to last post
  29. Calculating special lottery odds

    #s out of a bag! Hello, I would appreciate anyone's help in this problem: There are 11 balls in a bag numbered 0-10. You get 6 picks out of...

    Started by Copperfil‎, 11-16-2015 09:49 PM
    #lottery, #odds, #probability
    • Replies: 4
    • Views: 1,385
    11-24-2015, 12:54 AM Go to last post
  30. Bayesian Network - Dependency Direction

    Hi There, I am trying to build a Learning Bayesian Network model to understand Traffic density. Traffic density is to be explained by variables...

    Started by Judah‎, 11-13-2015 05:41 PM
    • Replies: 1
    • Views: 1,590
    11-23-2015, 11:43 AM Go to last post
  31. Probability During Sampling

    I work a biomedical lab, but I haven't had a statistics course in quite some time. It's important that our data have a p < 0.05. The question can...

    Started by djvan‎, 11-21-2015 03:53 PM
    • Replies: 3
    • Views: 2,035
    11-22-2015, 01:31 PM Go to last post
  32. Unobserved effect integrated out

    The question is whether the following argument holds: I start with some model \mu_1(x,c) = E such that E = \int_c E p(c\lvert x) dc I then...

    Started by JesperHP‎, 11-22-2015 12:33 PM
    • Replies: 0
    • Views: 1,272
    11-22-2015, 12:33 PM Go to last post
  33. College Football Bowl Pick'em Pool Probability

    I'm creating an excel spreadsheet for our office pool. If you're not familiar with the College Bowl Pick'em game, the rules are as follows... ...

    Started by klb311‎, 11-20-2015 02:01 PM
    • Replies: 2
    • Views: 2,804
    11-21-2015, 10:47 AM Go to last post
  34. Probability Density Function and Cumulative Distribution function

    Suppose you have a random variable X and Y with Joint PDF define by: f(x,y)= Ky -1<= x <=1, 0<y<|x| f(x,y) = 0 otherwise I found K=3. ...

    Started by newb7777‎, 10-31-2015 01:55 PM
    • Replies: 2
    • Views: 1,426
    11-16-2015, 08:51 PM Go to last post
  35. Gross up sample to population?

    Hi We emailed out a survey to 50 random customers. So far we received 10 responses back. For one of the Yes/No questions, question 7, we got 10...

    Started by Mark2015‎, 11-15-2015 07:56 PM
    • Replies: 0
    • Views: 1,246
    11-15-2015, 07:56 PM Go to last post
  36. Football (Soccer) Probability

    I am having some difficulty in understanding some information that I have been sent. I have been given the following information about two...

    Started by phrenetic‎, 11-12-2015 09:35 AM
    • Replies: 2
    • Views: 1,672
    11-15-2015, 02:20 PM Go to last post
  37. #s out of a bag!

    Hello, I am new to the forum, and have joined because the following question has stumped me. There are 11 balls in a bag numbered 0-11. You...

    Started by moose8500‎, 11-13-2015 06:01 PM
    • Replies: 0
    • Views: 1,368
    11-13-2015, 06:01 PM Go to last post
  38. Basic Probability help required.

    Hi, Im new to the site so apologies if I haven't posted the question correctly. But here goes, I have been given this question as an example to...

    Started by rookie88‎, 11-13-2015 09:48 AM
    • Replies: 0
    • Views: 985
    11-13-2015, 09:48 AM Go to last post
  39. correct update of bayesian posteriors

    the question looks a bit artificial but I simply tried to get rid of useless details. There are two persons, A, and B. they each got a number, a...

    Started by David Pekker‎, 11-12-2015 12:29 PM
    • Replies: 1
    • Views: 1,369
    11-12-2015, 11:58 PM Go to last post
  40. Powerball Jackpot

    Hello, I need help with my homework! I'm not really good at probability but I really want to learn, if its possible to help me with the answer and...

    Started by MMart‎, 11-11-2015 10:16 PM
    probability, statistics
    • Replies: 0
    • Views: 1,372
    11-11-2015, 10:16 PM Go to last post
  41. Tricky question

    Here's the problem: Let P(k) be a random draw of integers between 1 and k (inclusive). Assume you repeatedly apply P, starting at 10^1000. What's...

    Started by Aladdin‎, 11-11-2015 11:45 AM
    • Replies: 1
    • Views: 1,833
    11-11-2015, 09:31 PM Go to last post
  42. Thumbs up Which Formula do I Need?

    Hi, I've been scouring the internet for answers but I have very little knowledge when it comes to probability so I need help. I have 10 trials,...

    Started by 0hlie‎, 11-10-2015 08:02 PM
    • Replies: 2
    • Views: 1,561
    11-11-2015, 04:27 AM Go to last post
  43. Smile Random Variable probability question. Help for a non stastician

    Hi everyone, I have a stat question. lets assume I have five possible categories ( 1,2,3,4,5) for a quality issue. since 8 years, a total of...

    Started by Winterfell‎, 11-07-2015 03:25 PM
    • Replies: 2
    • Views: 1,903
    11-08-2015, 05:24 AM Go to last post
  44. An odd payout question...Please Help!

    I have a problem that I am trying to solve. I think my answer is correct, but I am not 100% sure. Any help you could provide would be greatly...

    Started by NCSUStudent‎, 11-03-2015 07:16 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,958
    11-05-2015, 01:16 AM Go to last post
  45. Average time needed..

    Dear Talk Stats users, First of I'm glad I found this forum and to be part of it! To keep a long story short: I've got a problem with an exercise...

    Started by Logistics‎, 11-02-2015 12:33 PM
    • Replies: 2
    • Views: 1,503
    11-02-2015, 01:27 PM Go to last post
  46. Please help!!!

    Hey everybody, Sorry this is my first time on this forum, I just have one question that my colleagues and I are interpreting in essentially...

    Started by ineedhelp!‎, 10-31-2015 08:38 PM
    • Replies: 2
    • Views: 1,615
    11-01-2015, 04:38 AM Go to last post
  47. Shared car usage

    Given a pool of C cars available to use by P people, the arrival rate of drivers to borrow cars is r, and the average trip time is t, how often will...

    Started by gpsfreak‎, 10-30-2015 09:56 AM
    probabilistic sampling, probabilities, probability, probability distribution, probability model
    • Replies: 1
    • Views: 1,106
    10-31-2015, 02:47 AM Go to last post
  48. Sampling in a bounded region by using a MCMC approach ensuring samples uniformity

    Hi everybody, tired of waiting any longer for your remarks. Thank you all. P.

    Started by pimassol‎, 10-30-2015 07:16 AM
    markov chain monte carlo, sampling, uniform samples
    • Replies: 0
    • Views: 1,343
    10-30-2015, 07:16 AM Go to last post
  49. Probability of duplicates

    Suppose I have a bag of N balls numbered from 1 to N. If I draw K balls at random with replacement, how do I calculate the expected number...

    Started by Jennifer Murphy‎, 10-29-2015 04:18 PM
    • Replies: 2
    • Views: 1,415
    10-30-2015, 01:24 AM Go to last post
  50. Help with Pathway Probability Problem

    I am completely lost on how to solve this problem. Any hint would help There is a lost tourist in New York. The streets in New York run east to...

    Started by joestat‎, 10-29-2015 08:20 PM
    • Replies: 1
    • Views: 2,352
    10-29-2015, 09:03 PM Go to last post
  51. Normal Average versus Weighted Average

    I'm taking a self-study course from "The Great Courses" called "Joy of Numbers". I'm on the lesson "Joy of Mathematical Games" and am confused by the...

    Started by B1966J‎, 10-29-2015 10:48 AM
    • Replies: 1
    • Views: 1,038
    10-29-2015, 02:07 PM Go to last post
  52. Samples

    Hello, maybe there is someone here who can answer the following question because I don not understand the basic behind it. 1. How do I find...

    Started by franzpeter‎, 10-28-2015 09:40 AM
    • Replies: 1
    • Views: 1,526
    10-28-2015, 09:55 AM Go to last post
  53. Probability of seeing given wild animal in area

    I would like to know how to try to calculate the probability that given individual wild animal is seen on area A when going through it via path, when...

    Started by mmakela‎, 10-24-2015 08:00 PM
    • Replies: 0
    • Views: 2,504
    10-24-2015, 08:00 PM Go to last post
  54. effect size and statistical significance

    Dear forum- this is my first post. I'm a teacher, looking to create a spreadsheet which calculates the effect size, and statistic significance of...

    Started by markhansen1983‎, 10-22-2015 12:02 AM
    • Replies: 1
    • Views: 1,600
    10-22-2015, 05:31 PM Go to last post
  55. urgent help need mean variance

    Hi everybody, If a random variable X is distributed in , can we say E>var? If yes, can you please give me a reference which is stated that or...

    Started by pasa‎, 10-21-2015 04:01 PM
    random variable, variance
    • Replies: 1
    • Views: 1,506
    10-22-2015, 12:51 AM Go to last post
  56. conditional binomial is a poisson distribution

    Hi, I'm fighting with this problem for a while. There is something important I'm missing So the problem goes like this X~Poisson(lambda) and Y|X=k...

    Started by exuberant‎, 12-24-2010 09:28 AM
    • Replies: 13
    • Views: 23,011
    10-21-2015, 04:01 PM Go to last post
  57. Stock market returns, Normal and Log-normal distributions - question

    I wondered if anyone could please help me with the following. - I'm looking at expected stock market returns for a hypothetical portfolio - We...

    Started by tormod46‎, 10-19-2015 09:54 AM
    • Replies: 1
    • Views: 2,666
    10-21-2015, 07:56 AM Go to last post
  58. Correlation between data and people

    Hi all, I need your help for this problem. I have to understand the probability to identify the person of a team gives me the product dirtier....

    Started by leomac‎, 10-13-2015 04:56 AM
    • Replies: 6
    • Views: 1,755
    10-21-2015, 06:19 AM Go to last post
  59. probability question

    Hello i need your helps in solving this question we have 20 boys an 10 girls, and i want to divide them to 5 groups, six in each group..(order...

    Started by mahde‎, 10-20-2015 12:46 AM
    • Replies: 4
    • Views: 2,470
    10-21-2015, 03:34 AM Go to last post
  60. Angry show navigation in a graph in R using markov decision making process

    I am trying to show navigation in R plot. The current status in time one or (t1) is set as val$currentstatus and next status in (t2) wants to be...

    Started by foad‎, 10-21-2015 03:23 AM
    • Replies: 0
    • Views: 1,050
    10-21-2015, 03:23 AM Go to last post

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