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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: 30,255
    09-30-2005, 09:44 AM Go to last post
  1. Question Puzzling problem

    King Zack's kingdom is on the brink of war with the neighboring kingdom of Yarmouth. King Zack has three advisors, Alfred, Belle, and Chris. ...

    Started by bioniclime‎, 03-12-2012 12:30 PM
    • Replies: 3
    • Views: 1,512
    03-12-2012, 01:48 PM Go to last post
  2. 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: 1,507
    02-16-2016, 01:38 PM Go to last post
  3. Real World Problem--Defending Your Gambling Losses

    I'm a slot player, bet the maximum on dollar machines ($40 is a typical bet). Over the period of a year I've had large wins of say, $4000, $14,000,...

    Started by birkoff‎, 08-07-2009 12:15 AM
    • Replies: 0
    • Views: 2,415
    08-07-2009, 12:15 AM Go to last post
  4. How is it possible to account for lucky guesses?

    I need to solve a problem involving assessing the ability of prospective film analysts to make accurate predictions of the total U.S. box office...

    Started by bitt3n‎, 06-21-2007 05:21 PM
    • Replies: 0
    • Views: 3,207
    06-21-2007, 05:21 PM Go to last post
  5. Need Help with this probability question

    Hi everyone, i am new to the forum. So I was never really good at probability, which is why I am posting here to see if I did these questions...

    Started by Biz‎, 10-20-2012 06:07 PM
    • Replies: 6
    • Views: 1,807
    10-20-2012, 08:50 PM Go to last post
  6. Please help me with these questions

    So my teacher gave us practice questions for a test review and i dont understand these questions at ALL. Can someone please explain how to do...

    Started by Biz‎, 10-21-2012 07:17 PM
    • Replies: 0
    • Views: 1,369
    10-21-2012, 07:17 PM Go to last post
  7. Conditional expectation

    Good afternoon, I have to calculate the expected value of a logistic distribution given that the values are above a given constant (lets say 0). So...

    Started by bizan‎, 06-12-2012 08:06 AM
    conditional expectation, expected value, logistic
    • Replies: 1
    • Views: 3,957
    06-14-2012, 04:58 PM Go to last post
  8. Stats question.

    Part 1. In how many ways can a television director schedule a sponsor's six different commercials during the six time slots allocated to commercials...

    Started by bjc-8000‎, 07-23-2008 02:56 PM
    • Replies: 1
    • Views: 3,085
    07-23-2008, 07:37 PM Go to last post
  9. 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: 2,431
    09-26-2009, 05:46 PM Go to last post
  10. Question Homework help with Confidence Intervals & Estimating Probability Proportions?

    I'm super lost on a few sets of my statistics homework and wondering if anyone can walk me through this so I can finish the rest of the questions as...

    Started by bjk8090‎, 11-24-2014 11:33 AM
    • Replies: 2
    • Views: 4,180
    11-24-2014, 02:46 PM Go to last post
  11. consectutive wins in 10,000 events

    Hello, Thanks in advance for your help. My question is related to probability. I think I know the answer, but I would like confirmation on my...

    Started by Bjorn‎, 08-04-2007 10:29 AM
    • Replies: 1
    • Views: 2,389
    08-13-2007, 03:40 PM Go to last post
  12. Joint distributions for Order Statistics

    I have a problem with part b of this question. I found the joint distribution and seem to have problem integrating it. I seem to have gotten a double...

    Started by bk123‎, 04-26-2013 12:45 PM
    • Replies: 8
    • Views: 2,605
    04-17-2014, 10:50 AM Go to last post
  13. Probability Q help, uses combinatorics, Poisson-Distr and possibly Multinomal

    Place successively and independent of each other 20 particles into 10 boxes. Hereby, each of the 10 boxes is chosen with the same probability. a)...

    Started by bkc‎, 12-10-2016 03:05 PM
    poisson, probability
    • Replies: 0
    • Views: 2,191
    12-10-2016, 03:05 PM Go to last post
  14. Variance and correlation coefficient

    Nothing to see here :)

    Started by bklstheman‎, 11-23-2006 10:45 AM
    • Replies: 1
    • Views: 2,224
    11-24-2006, 12:15 PM Go to last post
  15. help with binomial distribution

    Hello, I have a problem with this binomial question..I will try to make it short a machine makes on average 1 error per hour and needs to be...

    Started by blaah‎, 06-01-2012 04:28 PM
    • Replies: 0
    • Views: 1,379
    06-01-2012, 04:28 PM Go to last post
  16. Combinatorial Analysis HW Help

    There are 100 U.S Senators, two from each of the 50 States. If 12 Senators are randomly chosen to form a committee, what is the probabilty that...

    Started by blackhaze5‎, 02-08-2015 12:36 AM
    combinations, combinatorics, probability
    • Replies: 0
    • Views: 1,514
    02-08-2015, 12:36 AM Go to last post
  17. Do you think you can solve this problem? (I'm a beginner..please help..)

    Hi guys, I have no idea how to solve this problem...can anyone give me some piece of advice. (please..) If the probability density of X is...

    Started by blackjesus13‎, 10-18-2008 03:14 AM
    • Replies: 1
    • Views: 2,043
    10-18-2008, 09:07 AM Go to last post
  18. Very easy question for you...help

    Assume that the rate of return on projects is a random variable having a normal distribution with standard deviation = 0.05 per cent. If a bank...

    Started by blackjesus13‎, 10-19-2008 03:29 AM
    • Replies: 6
    • Views: 2,851
    10-20-2008, 11:10 AM Go to last post
  19. Poisson distribution...have you any ideas?

    While away from the office for an hour, a lecturer receives an average of six telephone calls. i)What conditions must be satisfied if the number...

    Started by blackjesus13‎, 10-19-2008 03:31 AM
    • Replies: 1
    • Views: 1,936
    10-20-2008, 11:45 AM Go to last post
  20. Smile Uniform and Independent Probability (Simple Problem)

    Hey there, I have a quick question. The problem: 3 numbers, say X, Y, and Z are chosen from a set of numbers (1 to n) where n is greater or...

    Started by blackrobe89‎, 10-11-2011 11:05 PM
    distribution, independent, probability, uniform
    • Replies: 7
    • Views: 3,319
    10-12-2011, 08:17 AM Go to last post
  21. Expected values, MGF

    I got a couple of exercise questions that a little help would be appreciated. 1.Suppose X and Y discrete RV with following joint PF: Y/X...

    Started by blacksuede‎, 05-27-2009 04:46 AM
    • Replies: 3
    • Views: 3,081
    05-27-2009, 11:27 PM Go to last post
  22. Scrabble probability question?

    I have a question for you probability and statistics experts out there. At the beginning of scrabble to determine who starts, each person (in this...

    Started by blahb‎, 10-04-2007 01:11 PM
    • Replies: 4
    • Views: 9,124
    12-21-2007, 04:22 PM Go to last post
  23. An interesting probability calculation problem

    Hello all! I'll be really glad if you respond to this question. I am working with an interesting probability calculation problem. In my problem...

    Started by Blain Waan‎, 01-17-2013 01:51 PM
    • Replies: 2
    • Views: 1,456
    01-17-2013, 02:20 PM Go to last post
  24. Probability calculation problem for a ranked set sample

    Let us consider a case where a ranked set sampling scheme from $n^2$ subjects has been adopted. There are a total of $n$ RSS blocks. So each RSS...

    Started by Blain Waan‎, 03-23-2013 03:12 AM
    probability question, probability theory, probablity
    • Replies: 1
    • Views: 2,325
    03-23-2013, 01:53 PM Go to last post
  25. Conditional probability of an event given two independent events

    I am dealing with an interesting probability problem. I had 16 subjects randomly divided into 4 different rooms, each room having 4 seats. The...

    Started by Blain Waan‎, 01-19-2015 11:17 AM
    probability, probability help, probability question
    • Replies: 2
    • Views: 1,877
    01-20-2015, 08:14 AM Go to last post
  26. Exclamation scrabble probability =]

    if im the first to draw all 7 SCRABBLE tiles what is the probabiltiy ill get an X and J? another question: what is the probabilty ill get...

    Started by blargh‎, 05-14-2008 06:34 PM
    • Replies: 1
    • Views: 4,939
    05-14-2008, 09:05 PM Go to last post
  27. Is this problem even possible to solve?

    "Last year 75% of Joe Shack's cash purchases were for less than $150. In a random sample of 200 cash processing companies, what is the probability of...

    Started by blippy‎, 03-14-2011 09:33 PM
    • Replies: 2
    • Views: 2,662
    03-15-2011, 12:30 AM Go to last post
  28. I choose a 4 digit number abcd between 0000 and 9999 at random.

    I choose a 4 digit number abcd between 0000 and 9999 at random. What is the probability that? a) What is the probability that |a-d| = 2? b) What...

    Started by blisman‎, 01-11-2013 10:21 PM
    probabilty
    • Replies: 2
    • Views: 3,212
    01-11-2013, 10:58 PM Go to last post
  29. probability of events in a row with binomial

    Hi, Suppose I have an event with probability p. I understand how to use the binomial formula to find the probability of k occurrences of that...

    Started by blmdzr‎, 05-04-2013 11:42 AM
    • Replies: 7
    • Views: 2,544
    05-07-2013, 06:23 AM Go to last post
  30. Exponentially Distributed Random Variable

    Hey everyone, im having a hard time with this questions, I guess its just not clicking. I was wondering if someone could give me some pointers. ...

    Started by Bloodshot‎, 07-19-2007 05:41 PM
    • Replies: 1
    • Views: 4,359
    07-20-2007, 07:11 AM Go to last post
  31. Expected Value of the Difference

    The heights of all male students in a university have mean 170 cm and standard deviation 10 cm. Two male students are randomly selected. What is...

    Started by Blooooooooo‎, 10-20-2010 01:21 PM
    • Replies: 3
    • Views: 8,842
    10-20-2010, 03:31 PM Go to last post
  32. A little help with choosing tests?

    Hello, I am new here. A little background, I am a Masters of Forensic Science student with a little statistics knowledge. I am currently working...

    Started by blpierce76‎, 07-15-2015 09:39 AM
    • Replies: 9
    • Views: 1,984
    07-21-2015, 09:32 AM Go to last post
  33. Probability of event vs. (?) probability of event occurring by chance

    Hi there: This is my first post so please forgive me if I am in the wrong section. This is not technically "homework", but it is a question that I...

    Started by blue11‎, 05-16-2013 10:33 PM
    • Replies: 6
    • Views: 2,711
    05-17-2013, 05:29 PM Go to last post
  34. Comparing proportions

    Hello there: I have a couple of questions about comparing proportions. 1) why do we use a z-test to compare proportions but t-test to compare...

    Started by blue11‎, 09-21-2014 01:35 PM
    • Replies: 0
    • Views: 1,028
    09-21-2014, 01:35 PM Go to last post
  35. 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: 1,296
    02-14-2016, 05:33 PM Go to last post
  36. Plase! I need urgent Help, MLE

    hello i'm really stucked with this problem. hope anybody oould help me out. Thanks!!

    Started by bluefire‎, 10-11-2010 11:08 PM
    • Replies: 1
    • Views: 2,476
    10-11-2010, 11:44 PM Go to last post
  37. Acceptance Testing - Calculating Type 1 and Type 2 Errors

    Removed...

    Started by bluejay‎, 01-27-2015 01:51 AM
    • Replies: 1
    • Views: 1,564
    01-27-2015, 11:25 AM Go to last post
  38. Joint Probability Question

    I was wondering if anyone knows how to do this: Five balls are drawn without replacement from an urn that contains 7 blue balls, 4 green balls and...

    Started by blues360‎, 03-17-2009 12:14 AM
    • Replies: 1
    • Views: 2,910
    03-19-2009, 02:01 PM Go to last post
  39. Help with conditional probabilty

    I've been struggling for a good couple hours on the below, and I was hoping someone might be able to push me in the right direction... "A"...

    Started by BlueScreenOD‎, 09-14-2009 06:54 PM
    • Replies: 2
    • Views: 2,674
    11-14-2009, 03:55 PM Go to last post
  40. Joint density function and conditional distribution

    Need help for my assignment question. I just can't get the answer for this question after hours of trying. Given the joint density function ...

    Started by blueycool‎, 06-01-2009 01:00 AM
    • Replies: 2
    • Views: 7,004
    06-01-2009, 01:58 AM Go to last post
  41. Is this a suitable way to summarize parameter distributions?

    Hello everyone, I have the following situation: I have a set of multiple environmental models with multiple parameters. I have now run these with...

    Started by BManz‎, 12-07-2012 01:34 PM
    coefficient of variation, parameter estimation
    • Replies: 0
    • Views: 972
    12-07-2012, 01:34 PM Go to last post
  42. collect sales taxes on items purchased through the internet

    Many states are carefully considering steps that would help them collect sales taxes on items purchased through the internet. How many randomly...

    Started by BMarks‎, 12-06-2007 03:58 PM
    • Replies: 0
    • Views: 5,421
    12-06-2007, 03:58 PM Go to last post
  43. Probability - mean, and deviation

    A scale designed so that when items are weighed, the errors in the indicated weights are normally distributed with a mean 0g and a standard deviation...

    Started by BMarks‎, 12-06-2007 04:07 PM
    • Replies: 0
    • Views: 3,553
    12-06-2007, 04:07 PM Go to last post
  44. random problems

    I get extremely confused about how to solve these problems. I don't even have examples to go by. For instance: In how many different ways can...

    Started by bmonkey‎, 10-01-2006 08:42 PM
    • Replies: 1
    • Views: 2,113
    10-02-2006, 02:24 AM Go to last post
  45. Magician

    A magician has cards 1-10 and a person picks two numbers. What is the probability that Sebastian will correctly name the 2 cards, if he is just...

    Started by boardinfanatic89‎, 10-22-2009 08:21 PM
    • Replies: 1
    • Views: 1,752
    10-23-2009, 10:31 AM Go to last post
  46. Erlang-k where k is Negative Binomial

    I have a stochastic process where calls have exponential interarrival times with parameter L and I have a stationary probability, p, that a call is...

    Started by Bob Gremley‎, 08-28-2007 10:35 AM
    • Replies: 0
    • Views: 2,654
    08-28-2007, 10:35 AM Go to last post
  47. Weighted coin probability

    The problem: A coin is weighted to show heads 60% of the time. How many coin tosses are needed to have 90% confidence of getting more heads than...

    Started by bob3690‎, 06-06-2011 06:05 AM
    • Replies: 5
    • Views: 5,472
    06-06-2011, 03:18 PM Go to last post
  48. Poisson Approximation

    A sequence of N triples of balls are randomly and independently placed into one of 100 boxes. Each triple of balls consists of a red, white and blue...

    Started by Bobby Smith‎, 12-09-2011 07:41 AM
    • Replies: 2
    • Views: 1,755
    12-09-2011, 09:03 AM Go to last post
  49. probability help...poisson process

    hi there can any one explain and show me how this is done please , i have a book at home and there are lots of unexplained questions . During...

    Started by bobby37‎, 03-23-2011 03:23 PM
    • Replies: 1
    • Views: 2,253
    03-23-2011, 04:28 PM Go to last post
  50. Fair bet question

    This is the question: Your friend proposes the following game. She will roll a fair dice six times. If the number of different numbers that show...

    Started by bobbyjoe‎, 04-01-2013 12:00 AM
    • Replies: 2
    • Views: 2,019
    04-02-2013, 04:41 AM Go to last post
  51. Moments of a random variable involving numerous Binomial Distributions

    I am editing my post because it might have been unclear. Suppose X is a random variable involving 4 binomially distributed random variables: X...

    Started by BobbyRichards‎, 05-06-2016 03:42 PM
    binomial distributions, moments
    • Replies: 6
    • Views: 1,369
    05-10-2016, 10:59 AM Go to last post
  52. Probability based on multiple pieces of information

    It's been about 20 year since my last stats class and I'm working on a fun little side project that involves some probability. I'm having some...

    Started by bobbytables‎, 07-20-2014 10:25 PM
    • Replies: 9
    • Views: 1,833
    07-22-2014, 12:57 PM Go to last post
  53. how to understand this probability

    Suppose there is a conditional probability density function p(x, pi| fi) which is called complete likelihood. This is a conditional joint...

    Started by bobwm‎, 06-22-2009 07:02 PM
    • Replies: 0
    • Views: 2,355
    06-22-2009, 07:02 PM Go to last post
  54. 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: 2,419
    06-21-2009, 04:59 PM Go to last post
  55. Inequalities between random variables

    Hi guys, I have the following question: Assuming that X and Y are two independent discrete random variables and Pr(X <= Y) is known how easily...

    Started by Bogdan‎, 09-13-2012 03:07 AM
    • Replies: 2
    • Views: 2,356
    09-15-2012, 02:11 AM Go to last post
  56. Simulate and sample from a group

    I'm confused with a question as follows: Consider the case that the total number of accidents happening in a highway in one day follows the...

    Started by Bojo‎, 03-14-2015 05:48 AM
    • Replies: 0
    • Views: 986
    03-14-2015, 05:48 AM Go to last post
  57. please i need help with this probleme

    hi,we got this mind breaking exercice from our probability teacher -.- note:it's question number 2 that's killing me a gate keeper have 12 keys and...

    Started by bomebome123‎, 12-29-2012 06:36 AM
    • Replies: 1
    • Views: 1,353
    01-02-2013, 01:36 PM Go to last post
  58. determining the most probable permutation of a set

    Is there any way to determine the most probable permutation of any given set? For example, given the set of letters SKTANH, is there a way to compute...

    Started by bonbonbaron‎, 09-30-2017 09:54 AM
    permutation, recurrent neural network, sequence
    • Replies: 2
    • Views: 157
    09-30-2017, 02:37 PM Go to last post
  59. Cup and ball game: what are the odds of that?

    OK we are having an intelectual discussion (no, really) about the change in odds during the classic cup and ball game. To explain: a dealer has...

    Started by bonedoctor‎, 02-22-2010 06:27 PM
    • Replies: 2
    • Views: 12,567
    02-22-2010, 08:00 PM Go to last post
  60. Stats homework help NYS

    New York Stock Exchange. Suppose that the percentage returns for a given year for all Stocks listed on the New York Stock Exchange follows a...

    Started by bonfar10‎, 10-22-2014 02:20 PM
    • Replies: 0
    • Views: 1,272
    10-22-2014, 02:20 PM Go to last post

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