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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: 30,390
    09-30-2005, 09:44 AM Go to last post
  1. Birthday problem

    ignore this, I have solved the problem

    Started by abcboy‎, 11-25-2006 12:52 AM
    • Replies: 0
    • Views: 2,465
    11-25-2006, 12:52 AM Go to last post
  2. Uniform Variable

    Can someone please help with the below problem? Derive the probability density function of X=U^2, where U is uniform on (0,1) Where do I even...

    Started by tc11‎, 10-26-2008 04:34 PM
    • Replies: 1
    • Views: 2,465
    10-26-2008, 05:29 PM Go to last post
  3. Probability of the sample Mean

    The weight (x) of an adult salmon in Lake Michigan is a normally distributed variable with the mean 5.5 lbs and a standard deviation of 0.5 lbs. An...

    Started by dayday404‎, 12-07-2010 06:11 PM
    • Replies: 0
    • Views: 2,465
    12-07-2010, 06:11 PM Go to last post
  4. Question [Question] Birthday Problem

    Here is the problem, I already get the answer, \frac{r}{365 -365(\frac{364}{365})^s} What do you think?

    Started by ilhamdoank‎, 10-26-2011 11:33 AM
    birthday problem, probability
    • Replies: 1
    • Views: 2,465
    10-26-2011, 12:04 PM Go to last post
  5. Numerical frequency analysis query

    Hi, I heard about this on radio 4 (UK) back in 2007. A statistical method whereby the frequency of integers in a dataset is calculated, then...

    Started by bamie9l‎, 03-08-2010 07:52 AM
    • Replies: 0
    • Views: 2,464
    03-08-2010, 07:52 AM Go to last post
  6. [SOLVED] 1st year Biostats student very lost!!! Please help...

    I have this question that I believe I have the correct answer for, however, I am unsure as to exactly what the proper formula is (and obviously...

    Started by kelly g‎, 01-27-2012 07:32 PM
    • Replies: 6
    • Views: 2,464
    01-27-2012, 09:01 PM Go to last post
  7. can anyone help on this one?

    Given two i.i.d uniform random points x and y on the interval , what is the average size of the smallest of the three resulting intervals?

    Started by tennis89‎, 09-10-2010 07:00 PM
    • Replies: 4
    • Views: 2,463
    09-11-2010, 10:04 AM Go to last post
  8. Probability HW

    Hi, I need some help figuring out the inclusion probability. Here is the problem: Unequal probability sampling is often unavoidable, so it is...

    Started by cwalte03‎, 10-13-2010 07:42 PM
    • Replies: 0
    • Views: 2,463
    10-13-2010, 07:42 PM Go to last post
  9. Central limit theorem - Approximation the Sum of Bernoullis to Normal Distribution

    Hello, I'm new in this forum and I would like to ask for your help. I have a set of Independent Bernoulli random variables, but they are not...

    Started by guerreiro74‎, 06-18-2013 07:34 AM
    approximation, bernoulli, clt, not iid
    • Replies: 9
    • Views: 2,463
    06-19-2013, 02:47 PM Go to last post
  10. Average Probablities over a quarter

    Hi all, I have the following probability data for a medical event, I need to find what was the overall probability for these three month? 1-...

    Started by alex_a‎, 10-31-2016 10:10 AM
    • Replies: 1
    • Views: 2,463
    10-31-2016, 01:48 PM Go to last post
  11. Help me please (homework)

    -Suppose a measurement of A has been made over a large population -5% of those population are positive for A -if A is measured on the same subject...

    Started by cpalad‎, 10-02-2007 04:40 PM
    • Replies: 1
    • Views: 2,462
    10-03-2007, 05:23 AM Go to last post
  12. Unhappy Urgent Markov Help - Stationary Distributions

    I have a mid-term in about 18 hours and I really need to know fast how to do this question. I have a 1-step transition matrix (see attached image)...

    Started by woody198403‎, 09-14-2009 10:00 AM
    • Replies: 0
    • Views: 2,461
    09-14-2009, 10:00 AM Go to last post
  13. Permutation probability

    Hi all, I am trying to find the probability of the permutation of correlated random variables. The problem is: Let X_i be correlated normal...

    Started by springgengxin‎, 06-14-2010 05:16 PM
    • Replies: 2
    • Views: 2,461
    06-15-2010, 06:49 AM Go to last post
  14. Relating Type I and Type II Error to C-charts

    Hello, I am trying to figure out how to relate type I and type II error calcuations to c-charts. Ive already calculated the 3 sigma control...

    Started by math&science‎, 04-20-2014 09:49 PM
    • Replies: 9
    • Views: 2,461
    04-21-2014, 03:25 PM Go to last post
  15. Basketball shooting percentage - binomial distribution?

    I am interested in studying the probability of team field goal percentage being unusually high. In context, I recently watched a women's college...

    Started by DRMORRIS‎, 02-14-2015 01:59 PM
    • Replies: 3
    • Views: 2,461
    02-15-2015, 11:59 AM Go to last post
  16. Travelling

    Hi, Still on my quest to sort probabilities problems involving time, I was trying to get help on this: If my car is traveling at 100 km / h in...

    Started by Dedes‎, 10-06-2016 10:27 PM
    • Replies: 2
    • Views: 2,461
    10-07-2016, 01:36 AM Go to last post
  17. SAMPLING DISTRIBUTIONS - I tried to answer the question please check my work!*!*!*!*!

    There was no help, and I don't want to give away my work when nobody offers any help to me.

    Started by IAMLOST‎, 01-31-2008 10:44 PM
    • Replies: 1
    • Views: 2,459
    02-01-2008, 03:58 PM Go to last post
  18. the oldest 100

    I’m studying activity (number of posts) for the first 100 users on an social network. It is skewness distribution. I am trying to find out if there...

    Started by maria_t‎, 09-01-2010 04:15 AM
    • Replies: 2
    • Views: 2,459
    09-01-2010, 02:26 PM Go to last post
  19. Exclamation change of variable help

    1. Let X~Geometric(1/4), and let Y have probability function: pY(y)= 1/6 if y=2 1/12 if y=5 3/4 if y=9 0 otherwise Let W=X+Y. Suppose X and...

    Started by omega‎, 10-31-2010 01:36 PM
    • Replies: 1
    • Views: 2,459
    11-01-2010, 07:53 PM Go to last post
  20. Help on Stats Assignment!

    hey guys, In the town of Dumparonster it is well known that garbage must be out by 8am each Monday morning and that each house in the town has a...

    Started by strongt‎, 02-11-2009 08:00 PM
    • Replies: 2
    • Views: 2,458
    02-12-2009, 12:19 PM Go to last post
  21. Help On Probablity Immediatly

    For a particular brand of popcorn in an air popper, the average number of kernels that fail to pop is 6.8 per cup. a.) Find the probability that 5...

    Started by jensen02431‎, 03-13-2008 11:39 AM
    • Replies: 1
    • Views: 2,457
    03-17-2008, 09:20 PM Go to last post
  22. Statistical significance for discrete data?

    I'm getting myself in a muddle and hoping someone can help! I am analysing a discrete data set - I am comparing my control and experimental group,...

    Started by 1982lu‎, 08-09-2008 09:28 AM
    • Replies: 0
    • Views: 2,457
    08-09-2008, 09:28 AM Go to last post
  23. Unhappy A problem about poisson process

    Hi all, I have a question about the poisson process. Below is the queston: Consider each transition of the poisson process as an event, for...

    Started by Laiton‎, 04-26-2009 04:56 PM
    • Replies: 0
    • Views: 2,454
    04-26-2009, 04:56 PM Go to last post
  24. 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: 2,454
    06-26-2014, 10:26 PM Go to last post
  25. Machines fail randomly once a month on average.

    With one machine how long do I have to wait, on average, for a failure? I don't know when the last failure was. How long for the first failure...

    Started by Outlier‎, 03-14-2010 04:46 PM
    • Replies: 4
    • Views: 2,453
    03-15-2010, 09:55 AM Go to last post
  26. Expectation of a density function

    Hi guys, I have a question about the calculation of the expectation based on a density function where the integral is NOT 1. Is it okay to...

    Started by Stats_Newbie‎, 01-14-2014 10:23 AM
    • Replies: 4
    • Views: 2,453
    01-14-2014, 02:07 PM Go to last post
  27. Help!!!!

    the demand for a magazine is thought to be modelled by a Gamma distribution with mean 10,000 and variance 1,000,000. A publisher prints and...

    Started by MillyMay‎, 02-24-2010 07:15 AM
    • Replies: 2
    • Views: 2,451
    02-24-2010, 08:03 AM Go to last post
  28. PDF and Mean

    I have a couple of question here I can't figure out. Does anyone know how to prove these? And can you explain why? Find the probability density...

    Started by congers@yoeric.com‎, 01-31-2006 10:57 AM
    • Replies: 1
    • Views: 2,450
    01-31-2006, 11:22 PM Go to last post
  29. probability help pugowner

    14. A study was made to determine the calories, total fat content and sodium in 54 brands of “veggie” burgers as shown below. < 130...

    Started by pugowner‎, 10-03-2008 09:40 PM
    • Replies: 5
    • Views: 2,450
    10-04-2008, 05:06 PM Go to last post
  30. stuck on a probability problem

    THe question is according to the January theory if the stock market is up in Jan. it will be up all year, if its down it will be down all year....

    Started by bjfro‎, 09-26-2009 05:46 PM
    • Replies: 0
    • Views: 2,450
    09-26-2009, 05:46 PM Go to last post
  31. variable dependency check

    hi, i am a bit confused. i know how to check if two variables are not correlated. but how do i check they are independent? for instance i have...

    Started by zhenyazh‎, 01-24-2010 04:32 AM
    • Replies: 0
    • Views: 2,450
    01-24-2010, 04:32 AM Go to last post
  32. Exclamation Determine the risk (probability) of meeting forecasted demand

    Hi, I'm doing a project for a car company for my final year studying Industrial Engineering. The company forecast demand 4 months ahead but,...

    Started by wbez0601‎, 05-07-2016 07:34 AM
    monte carlo, probability, stochastic modeling
    • Replies: 1
    • Views: 2,450
    05-08-2016, 02:03 PM Go to last post
  33. Need Help with Practice Exam Question ASAP

    Hi. I have an exam coming up and I have no clue on how to do this problem on the practice exam. Can someone help me as soon as you can? Thanks. ...

    Started by angelica‎, 08-06-2007 08:03 AM
    • Replies: 0
    • Views: 2,449
    08-06-2007, 08:03 AM Go to last post
  34. Mutual independence -> Conditional independence ?

    hi, all! I have the following question about relations between conditional independence and mutual independence: Does Mutual independence imply...

    Started by -coffee-‎, 05-07-2012 07:39 AM
    • Replies: 1
    • Views: 2,448
    05-07-2012, 09:31 AM Go to last post
  35. Polyp probability

    some help would be greatly appreciated, this should be easy for people here, but unfortunately i am bad with this stuff. 15 polyps are discovered...

    Started by intric8‎, 06-25-2012 09:17 AM
    • Replies: 12
    • Views: 2,448
    06-27-2012, 12:15 AM Go to last post
  36. a question about normal distribution

    Hi, there, Since I can not edit equation, please see the attachment for it. I can not understand this equation. If it's a normal...

    Started by bobwm‎, 06-21-2009 04:59 PM
    • Replies: 0
    • Views: 2,447
    06-21-2009, 04:59 PM Go to last post
  37. Calculating a new probability based on a scenario

    I have a number of assets, that I own a portion of, attached. Each asset has an individual annual probability of loss. However, the whole group is...

    Started by prr‎, 12-10-2009 07:35 AM
    • Replies: 0
    • Views: 2,446
    12-10-2009, 07:35 AM Go to last post
  38. Unhappy Binomial Probablity Distribution exactly one & and at least one.. check my answer

    Your favorite baseball player has a 0.300 batting average (that is, he averages three hits for every 10 times he is up to bat). If he is up to bat...

    Started by ANNJALA‎, 10-11-2016 11:31 AM
    binomial probability
    • Replies: 3
    • Views: 2,446
    10-11-2016, 02:35 PM Go to last post
  39. Talking Help Please

    hello I really need some help.. I have a test tomorrow and Im still a little confused. MNM Corp. gives each of its employees an aptitude test. The...

    Started by KmClark84‎, 11-13-2006 06:29 PM
    • Replies: 1
    • Views: 2,445
    11-15-2006, 05:48 PM Go to last post
  40. Confirmation?

    Just wrote an exam, was able to copy down the questions along with my answers. I don't need you to solve them, but just to clarify some things. 1)...

    Started by jamesmartinn‎, 02-13-2009 09:26 AM
    • Replies: 2
    • Views: 2,445
    02-13-2009, 10:17 AM Go to last post
  41. Question trouble...

    Working on this for a class and wondering if I did this correctly. If anyone could help that would be great. Thanks in advance! 60% of the...

    Started by aqulopez44‎, 09-28-2009 05:00 PM
    • Replies: 2
    • Views: 2,445
    09-28-2009, 10:50 PM Go to last post
  42. Joint Density Help

    What is joint density?

    Started by Porter1‎, 11-23-2009 02:22 AM
    • Replies: 0
    • Views: 2,445
    11-23-2009, 02:22 AM Go to last post
  43. question regarding distribution mean (app Crystal Ball)

    Hi everyone, I have a question that I have come across running some Crystal Ball simulations however, I think the problem is rather a generic...

    Started by david.‎, 11-11-2011 04:39 AM
    • Replies: 1
    • Views: 2,444
    11-11-2011, 05:27 AM Go to last post
  44. How to calculate the probability between two normal distributions?

    Using the normal distribution. Let X  N(1, 2) and Y  N(2, 3) where N(μ, variance) denotes the normal distribution with mean μ and variance . X...

    Started by supremerule8‎, 02-21-2013 04:51 PM
    normal distribution, probability density, variance
    • Replies: 7
    • Views: 2,444
    02-21-2013, 07:42 PM Go to last post
  45. Help with problem

    I am studying a non-symmetric binary memoryless transmission channel. Where the probability to receive a logical 0 when we send a 1 I have named it...

    Started by stu114‎, 11-17-2010 03:35 AM
    • Replies: 1
    • Views: 2,443
    11-17-2010, 11:38 AM Go to last post
  46. Probability question

    In a city where 30% occupants are foreign, the probability of a foreign being questioned is 40%, while for a local is 10%. What is the likelihood...

    Started by thedeath‎, 11-19-2006 06:34 AM
    • Replies: 2
    • Views: 2,442
    11-21-2006, 01:21 AM Go to last post
  47. What's wrong with this sample space?

    "A coin is tossed until for the first time the same result appears twice in succession. Describe the sample space." My answer: \Omega :=...

    Started by derksheng‎, 08-07-2012 10:30 AM
    • Replies: 6
    • Views: 2,442
    08-07-2012, 01:08 PM Go to last post
  48. here is another one

    I have done this a million times with the same result... it is apparently incorrect but I cannot figure out why... what percentage of a circle will...

    Started by elce‎, 04-15-2006 11:10 PM
    • Replies: 1
    • Views: 2,441
    04-15-2006, 11:18 PM Go to last post
  49. binomial probability

    ok so here is the question i attempted but no getting the answer a loan officer has indicated that 80% of all loan application forms have zero...

    Started by cushane‎, 03-19-2012 06:48 PM
    • Replies: 0
    • Views: 2,440
    03-19-2012, 06:48 PM Go to last post
  50. random sampling question - I need help

    A journalist wanted to learn the views of the chief executive officers of the 500 largest United States corporations on program trading of stocks. In...

    Started by anthonys‎, 03-15-2006 02:24 AM
    • Replies: 2
    • Views: 2,439
    04-01-2006, 01:20 AM Go to last post
  51. Probability help

    An investment offers the chances of various returns for each of 3 years as follows- Year Return- $30,000 $40,000 1 ...

    Started by lesgriffith‎, 04-27-2008 05:35 AM
    • Replies: 0
    • Views: 2,439
    04-27-2008, 05:35 AM Go to last post
  52. please check

    X) How many different eleven-letter words (not necessairly pronounceable or meaningful) can be made from the letters in the word MISSISSIPPI? ANS:...

    Started by jamesmartinn‎, 09-15-2008 09:06 AM
    • Replies: 4
    • Views: 2,439
    09-20-2008, 12:20 PM Go to last post
  53. Trying to help out a teacher with this

    My neighbor is an elementary school teacher and asked for my help with this, but I haven't done a math problem like this in years! She's grading...

    Started by Kshow‎, 01-24-2009 04:59 PM
    • Replies: 1
    • Views: 2,439
    01-24-2009, 05:43 PM Go to last post
  54. The multi-factor model is a multivariate gaussian distribution?

    I'm sure that the following question is trivial, but I can't found a solid demonstration. Can we state that multi-factor model is a multivariate...

    Started by gtorrent‎, 06-28-2012 10:37 AM
    gaussian copula, multi-factor model, multivariate normal
    • Replies: 1
    • Views: 2,439
    07-16-2012, 11:11 AM Go to last post
  55. Post formulating probabilities

    Could anyone help? Please! Joe Smith batted .347 in 2007. So assume the probability of getting a hit is .347 for each time he batted. In a...

    Started by help72‎, 09-10-2008 03:02 PM
    • Replies: 1
    • Views: 2,438
    09-10-2008, 07:13 PM Go to last post
  56. A large and powerful corporation is extorting money from the public.

    When confronted with ****ing evidence the corporate CEO says these were rogue employees, these were anomalous cases, etc., etc., etc.. . . . ...

    Started by Outlier‎, 08-06-2011 04:00 PM
    • Replies: 5
    • Views: 2,438
    08-07-2011, 09:47 AM Go to last post
  57. Post Need help with this problem

    On average, every six minutes a car passes by a sector in which it plans to build a tunnel. The passage of many vehicles indicate risk of congestion...

    Started by luis0426‎, 03-05-2014 04:53 PM
    • Replies: 2
    • Views: 2,438
    03-05-2014, 07:24 PM Go to last post
  58. Question calculating frequency of ingredients in various cookbooks?

    Hi Everybody I just need a push in the correct direction of which statistics formula I should use and how? I am given x number (unknown) of...

    Started by dontrigg‎, 06-25-2006 11:41 AM
    • Replies: 3
    • Views: 2,437
    07-19-2006, 09:14 AM Go to last post
  59. Monty Hall

    You are playing a game show, in which there are prizes behind three doors. One prize is good (eg a car), and the others aren't (eg. a goat and a...

    Started by jamesmartinn‎, 10-07-2008 08:54 PM
    • Replies: 1
    • Views: 2,437
    10-07-2008, 10:06 PM Go to last post
  60. Drawing more than 1 marble

    Hi, My answer doesnt tally with the answer provided, can someone please have a look and figure out where I am mistaken? Thank u so much If four...

    Started by SadieKhan‎, 09-11-2011 04:07 PM
    • Replies: 2
    • Views: 2,437
    09-12-2011, 01:14 PM Go to last post

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