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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: 30,208
    09-30-2005, 09:44 AM Go to last post
  1. If a RV is a function of another RV, then they are dependent?

    Hello all! This is my first post on this forum. I just have a simple question. If a rv Z is a function of another rv X, then is it guaranteed that...

    Started by alext9036‎, 02-23-2013 12:26 AM
    • Replies: 6
    • Views: 1,908
    02-26-2013, 04:43 AM Go to last post
  2. Marginal Densities of 3 Joint Normal r.v.s in Polar Coordinates

    Hey all, So fun question. X, Y and Z are independent ~ N(0,sigma^2). x = r*sin(phi)*cos(theta) y = r*sin(phi)*sin(theta) z = r*cos(phi) 0 <=...

    Started by tritan.ex47‎, 02-01-2012 01:10 AM
    • Replies: 6
    • Views: 3,835
    02-01-2012, 11:12 AM Go to last post
  3. hypergeometric distribution problem

    Hi I'm having a hard time finding the solution to the following problem: Any ideas, tips or anything that will guide me in the right direction...

    Started by odgaard‎, 02-15-2012 09:31 AM
    • Replies: 6
    • Views: 2,548
    02-15-2012, 11:56 AM Go to last post
  4. Drug Reaction Probability

    In a clinical test of the drug Viagra, it was found that 4% of those in a placebo group experienced headaches. Assuming that the same 4% rate applies...

    Started by kelly g‎, 02-27-2012 09:32 PM
    • Replies: 6
    • Views: 6,213
    02-27-2012, 11:15 PM Go to last post
  5. On Correlation Matrices

    Hi. This is a question from a question bank. I am self-studying for upcoming MS exam. a)Random vector X, elements are independent and zero mean....

    Started by alidemedi‎, 03-01-2012 11:13 PM
    • Replies: 6
    • Views: 2,208
    03-02-2012, 12:16 AM Go to last post
  6. Bayes thoerem, can you check my solution please?

    Hi, I'm terrible at statistics, i hope someone can help. A ship sank into the sea and is now laying in a fixed but uknown position on the bottom...

    Started by any_body‎, 03-05-2012 07:59 AM
    bayes thoerem
    • Replies: 6
    • Views: 2,163
    03-05-2012, 12:20 PM Go to last post
  7. Probability Distribution Function

    Hi Every one. Can any one help me to start solving this problem?i am stocked in the beginning. The range of a ballistic projectile is given by ...

    Started by 22nelson‎, 03-13-2012 09:44 PM
    pdf cdf
    • Replies: 6
    • Views: 2,126
    03-15-2012, 03:49 AM Go to last post
  8. Help with derivation of probability density of {event generation} & {event detection}

    I would like to specify a new probability distribution that relates to an event of size M being produced by some process and subsequently detected....

    Started by chippy‎, 03-31-2012 10:31 AM
    combining variables, density function, probability distributions
    • Replies: 6
    • Views: 1,897
    04-05-2012, 05:24 PM Go to last post
  9. Approximately chi-quadrat distributed

    Hi all, the definition of the chi-quadrat distribution is \chi^2_n \sim Z_1^2 + \dots + Z_n^2 with Z_i \sim N(0,1) My question: Are...

    Started by Jacov‎, 04-09-2012 09:10 AM
    • Replies: 6
    • Views: 1,979
    04-10-2012, 01:13 AM Go to last post
  10. E(X), bag with 6 red and 5 black balls, X = number of red balls

    A bag contains 5 black and 6 red balls. Two counters are drawn, one at a time, and not replaced. Let X be "the number of red counters drawn". Find...

    Started by Hans Rudel‎, 04-25-2012 11:25 AM
    e(x), pdf
    • Replies: 6
    • Views: 4,007
    04-25-2012, 12:52 PM Go to last post
  11. Probability problem help

    I'm needing a little help finding the probability of a problem, I think I did this right but would just like to confirm. The problem is about mean...

    Started by jjhall5150‎, 04-26-2012 01:39 PM
    • Replies: 6
    • Views: 3,243
    04-26-2012, 04:03 PM Go to last post
  12. Field Assignment

    Please help me in finalizing all the sets in this event space. I am creating a field generated by script B: {{2,4},{6,8}}.

    Started by statisticsnewbie‎, 06-25-2012 10:14 PM
    field
    • Replies: 6
    • Views: 2,079
    06-26-2012, 12:29 AM Go to last post
  13. Probability of 3 out of 4 Independent Events Occurring in Golf Foursome

    I have 4 golfers playing together in a foursome. I know the probability of each making a par or better on a given hole: A-player: 60% ...

    Started by hunt68‎, 06-28-2012 07:55 AM
    • Replies: 6
    • Views: 2,934
    06-28-2012, 10:11 AM Go to last post
  14. Permutations involving additional chances

    I am attempting to calculate the probabilities of a simple dice game. I have actually calculated the perfect score, and the additional permutations...

    Started by Absinthe‎, 07-08-2012 06:44 PM
    • Replies: 6
    • Views: 2,779
    01-13-2014, 09:44 AM Go to last post
  15. Probability problem

    I'm teaching myself the basics of probability using an old book called "A programmed introduction to probability" by J.R.Dixon, published in 1964....

    Started by Jacobite‎, 07-24-2012 02:28 AM
    • Replies: 6
    • Views: 1,918
    08-16-2012, 06:22 AM Go to last post
  16. Probability Theory Query - Which one?

    I was wondering if an anyone suggest a possible probability theory for a piece of work I'm doing. Essentially I have a sequence of values (all...

    Started by hotchpotch‎, 08-04-2012 06:02 PM
    • Replies: 6
    • Views: 1,591
    08-04-2012, 08:10 PM Go to last post
  17. 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: 2,401
    08-07-2012, 01:08 PM Go to last post
  18. 818 Facebook Friends, 0 Birthdays

    Hi all, first time poster here. I am an avid facebooker and like to wish people happy birthdays when they come up. Today, for the first time, I...

    Started by kmac1112‎, 08-21-2012 12:47 PM
    • Replies: 6
    • Views: 2,020
    08-21-2012, 02:09 PM Go to last post
  19. gambling/trading problem

    Hi folks, I have a probability calculation problem that is currently doing my head in and I wonder if someone can tell me where I've gone wrong...

    Started by ratbag2‎, 08-26-2012 07:03 PM
    • Replies: 6
    • Views: 1,671
    08-27-2012, 03:42 AM Go to last post
  20. Predicting the chance of attendance for a given appointment time

    Hi I do work for a health screening programme that screens hundreds of thousands of diabetic patients every year to try to prevent blindness. ...

    Started by Renegade666‎, 09-25-2012 11:22 AM
    • Replies: 6
    • Views: 2,254
    09-25-2012, 02:57 PM Go to last post
  21. [SOLVED] Pharmacy errors

    Hello, I am lost on these questions. Could someone please help me? What is the median number of prescriptions until the pharmacist makes the first...

    Started by dina786‎, 10-01-2012 06:11 PM
    • Replies: 6
    • Views: 2,649
    10-01-2012, 11:30 PM Go to last post
  22. comparing pass/fail rates among teachers

    Suppose there are 1,050 students all age 15 and each student is randomly assigned to one of seven different teachers. However, teachers are allowed...

    Started by greg30043‎, 10-01-2012 10:20 PM
    • Replies: 6
    • Views: 4,832
    10-05-2012, 08:15 AM Go to last post
  23. Error in Calculating the Variance of X?

    Hello, I am solving the following problem: “A Salesman has scheduled two appointments to sell encyclopedias. His first appointment will lead to a...

    Started by S-C-3-1-3‎, 10-02-2012 02:00 AM
    • Replies: 6
    • Views: 2,329
    10-02-2012, 12:57 PM Go to last post
  24. 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: 1,801
    10-20-2012, 08:50 PM Go to last post
  25. Probablity and Usability

    Here is the question: A usability engineer claims that in usability experiments there is a 40% chance (or a probability value of 0.4) that a user...

    Started by somethingclever‎, 10-20-2012 08:41 PM
    • Replies: 6
    • Views: 1,823
    10-21-2012, 11:58 AM Go to last post
  26. Expected Value - Help PLEASE!!!

    How do you find E(1/X)? X is distributed binomially with probability p and n+1 terms: X~Binom(n+1, p). So E(X) = p(n+1), but how do I find E(1/X)?...

    Started by Aria1‎, 11-02-2012 03:57 AM
    expected value
    • Replies: 6
    • Views: 1,727
    11-02-2012, 02:21 PM Go to last post
  27. Xn~Exponential(.5) -> Xn~Normal. Use Chebychev's inequality

    Xn are iid Exponential(.5). After using the central limit theorem, Xn is Normally distributed. Use chebychev's inequality to find out how large n be...

    Started by phychoflip29‎, 10-15-2012 04:57 PM
    chebychev's inequality, exponential, normal
    • Replies: 6
    • Views: 2,260
    10-20-2012, 03:01 PM Go to last post
  28. General Probability Question

    Hi, I was wondering why one of the solutions to my answers says P(t>=2) = 1-P(t<=1), and another solution for a different problem says...

    Started by S-C-3-1-3‎, 11-12-2012 03:37 PM
    • Replies: 6
    • Views: 1,154
    11-13-2012, 12:05 AM Go to last post
  29. Probability distribution of active calls at a telephone exchange

    Please, could someone help me with this exercise from this book: Suppose that calls arrive at a telephone exchange according to a Poisson process...

    Started by zakmck‎, 05-05-2013 12:35 PM
    • Replies: 6
    • Views: 3,647
    05-06-2013, 07:37 AM Go to last post
  30. What is the probability of getting 6 uniques in 10 tries?

    Each of these balls contain 1 figure. There is a total of 6 different figures to collect. There is an equal chance to get any of those 6 figures when...

    Started by MathIsOhSoHard‎, 01-18-2013 11:19 PM
    • Replies: 6
    • Views: 1,617
    01-19-2013, 02:50 PM Go to last post
  31. Exclamation Homework Problem. Please Help!

    I'm having problems mostly with part (b) and (c). Please add every single step and side note you can - including formulas used. I greatly appreciate...

    Started by ca91‎, 04-28-2013 12:45 AM
    homework, homework help
    • Replies: 6
    • Views: 2,858
    04-28-2013, 02:30 PM Go to last post
  32. Probability Modelling?

    Hello, first off, I'm not English, nor majoring in statistics & the sorts, nor have more than simple knowledge about the topic, so forgive me for any...

    Started by ktx2skd‎, 02-19-2013 05:28 PM
    • Replies: 6
    • Views: 1,401
    02-23-2013, 09:02 AM Go to last post
  33. need pointers to the right direction...

    A tyre company has invented a revolutionary new product. In order to overcome consumer resistance a mileage guarantee is offered with the tyre. Road...

    Started by gigovv‎, 03-14-2013 11:06 AM
    • Replies: 6
    • Views: 1,865
    03-14-2013, 11:53 AM Go to last post
  34. Study question

    Reviewing for an exam I have become stumped, \int_{1}^{x} {3}{t}^{-4}{dt} =1-{x}^{-3} P(x<2|x \geq 1.5) and so on

    Started by Matthew18342‎, 02-15-2013 02:36 PM
    • Replies: 6
    • Views: 1,793
    02-15-2013, 03:28 PM Go to last post
  35. A little confused

    I am doing these problems and I am looking at the shading, why is the 2 all the way on the right? Shouldn't it be on the left? And should the X and Z...

    Started by PSG‎, 03-25-2013 12:09 AM
    • Replies: 6
    • Views: 1,865
    03-31-2013, 03:57 AM Go to last post
  36. Need help with nCk

    solved...thread can be trashed.

    Started by ethunnn‎, 03-24-2013 08:42 PM
    • Replies: 6
    • Views: 2,367
    03-29-2013, 09:00 PM Go to last post
  37. Calculating Probability of Failure

    I am a solicitor with an engineering background. I have a client who needs to work out what the probability is that a customer will be injured by a...

    Started by alexmay‎, 01-31-2013 06:46 AM
    • Replies: 6
    • Views: 2,917
    01-31-2013, 02:32 PM Go to last post
  38. Probability table needs double checking

    solved...thread can be trashed.

    Started by ethunnn‎, 03-25-2013 12:55 PM
    • Replies: 6
    • Views: 1,752
    03-26-2013, 12:02 AM Go to last post
  39. Geometric and independence

    Hi, New to this forum here. I have attached an interesting question that involves geometric distribution and independence. 3 Questions in all. ...

    Started by meeksoup‎, 03-20-2013 08:21 PM
    • Replies: 6
    • Views: 2,357
    03-23-2013, 12:42 PM Go to last post
  40. Expected Value Distribution

    Hi, I have a question pertaining to the problem: The expected value of the number of customers entering a shop during a 15 minute time interval...

    Started by Bikelyst‎, 05-15-2013 03:27 PM
    • Replies: 6
    • Views: 1,754
    05-15-2013, 04:13 PM Go to last post
  41. 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: 2,697
    05-17-2013, 05:29 PM Go to last post
  42. Probability of sum of 6 digit number

    Hi, What is the probability of sum of any 6 digit number (ranging from 000000 to 999999) to be equal to 12. Actually I am looking for the...

    Started by badaya‎, 06-14-2013 11:47 AM
    • Replies: 6
    • Views: 3,938
    06-14-2013, 01:42 PM Go to last post
  43. Question Occupany problem

    This is a homework problem that deals with occupancy. Q: consider r indistinguishable balls and n cells where n > r. The r balls are placed at...

    Started by TrikyMove‎, 09-23-2013 09:44 PM
    • Replies: 6
    • Views: 2,622
    09-25-2013, 06:47 PM Go to last post
  44. Poussin distraction

    Poisson distribution Hi guys this question has mind blanked me A call centre receives an average of 10 calls per hour. What is the...

    Started by ianhirst‎, 11-19-2013 05:10 PM
    • Replies: 6
    • Views: 2,205
    11-20-2013, 12:55 AM Go to last post
  45. Need Help

    If anyone can take a look at these two problems and see my answers and let me know if I did it correct or am doing it wrong it would be greatly...

    Started by bigbob‎, 09-29-2013 04:56 PM
    • Replies: 6
    • Views: 2,965
    09-29-2013, 07:27 PM Go to last post
  46. MLE of a weirdly split lambda in a Poisson distribution

    Hi everyone! :) I'm new here. I have been looking everywhere for the solution to this problem so here's to hoping some of you can help me. :) ...

    Started by L1meta‎, 10-22-2013 07:35 AM
    mle, poisson distribution
    • Replies: 6
    • Views: 2,614
    10-24-2013, 06:39 AM Go to last post
  47. Probabilty of picking a card in a deck

    I've never been very good in probability but I want to know how to calculate this. This is not a homework assignment or anything I am just curious....

    Started by tralli‎, 11-02-2013 02:17 PM
    • Replies: 6
    • Views: 1,878
    11-03-2013, 07:37 AM Go to last post
  48. Privacy vs safety, please critique

    Feel free to put in your own reasonable numbers. AT&T says US citizens value their privacy at $350/year. My chance of being killed by some...

    Started by Outlier‎, 12-18-2013 05:34 PM
    • Replies: 6
    • Views: 1,895
    12-20-2013, 09:23 AM Go to last post
  49. Expectation of variance

    Trying to figure out the expectation of the population variance, i.e. Egetting stuck on what I'm sure will turn out to be some simple algebra. I...

    Started by Prometheus‎, 12-29-2013 08:03 AM
    • Replies: 6
    • Views: 3,467
    01-02-2014, 02:42 PM Go to last post
  50. A bouncing ball is giving me fits.

    Hi. Thank-you for reading this. My name's Philip Ripper. I'm not a student. I'm a curious person with a fairly poor math education. This is...

    Started by Tethers‎, 04-11-2014 12:00 PM
    • Replies: 6
    • Views: 1,603
    04-11-2014, 08:53 PM Go to last post
  51. help with a tricky question

    hi guys, when i was looking for statistics exams to practice i found this problem at mit final exam back at 2004 the condition for failure of a...

    Started by MFM‎, 04-21-2014 09:36 AM
    • Replies: 6
    • Views: 1,711
    04-21-2014, 04:52 PM Go to last post
  52. Statistics Probability question

    At an allergist’s office, patients are screened for having a peanut allergy. The probability of having a peanut allergy is 0.023. The probability...

    Started by laurenwatkins‎, 04-28-2014 02:17 PM
    probability
    • Replies: 6
    • Views: 1,906
    04-29-2014, 11:46 AM Go to last post
  53. Unhappy PLEASE lead me in the right direction!

    Here is the question that I can't seem to figure out!!! PLEASE HELP!! I've attached the JPEG of the question. This is my last question out of about...

    Started by quadoduece‎, 05-13-2014 11:37 PM
    • Replies: 6
    • Views: 1,881
    05-14-2014, 01:48 AM Go to last post
  54. Probability vs sample size graph.

    Hi, if have a question about how a graph of probability vs sample size might look. I know the line would never be linear but it could either sigmoid...

    Started by Morganb4‎, 05-22-2014 10:01 PM
    • Replies: 6
    • Views: 2,147
    05-23-2014, 11:36 PM Go to last post
  55. Normal and standard distribution question

    I have X \sim N(0,1) and Y \sim N(\mu,\sigma^2) Apparently then Y =\sigma X + \mu I can't quite see how, and can't find anything on the...

    Started by Prometheus‎, 05-25-2014 08:50 AM
    • Replies: 6
    • Views: 1,795
    07-21-2014, 11:47 AM Go to last post
  56. IP probability question

    hi guys. as you know, IP is a combination of 4 parts. every part is from 0-255, for example 234.32.135.7. now, my question is, what is the...

    Started by uv_h‎, 06-06-2014 09:48 AM
    probability
    • Replies: 6
    • Views: 2,652
    07-08-2014, 07:12 AM Go to last post
  57. Probability Help

    Hi, I giving my IGCSE this November and came across a problem that I can't solve. It'd be really helpful if someone can help me with the sum. ...

    Started by preziano‎, 06-09-2014 01:59 AM
    • Replies: 6
    • Views: 1,555
    06-09-2014, 04:30 AM Go to last post
  58. Homework help?

    Hi... So I'm taking statistics as an independent study this summer... Having troubles. I'm on my last question for the night. Can someone walk me...

    Started by AlmostdsntCount‎, 06-13-2014 10:59 PM
    • Replies: 6
    • Views: 3,025
    06-18-2014, 01:45 PM Go to last post
  59. An event and its complement

    My wife was overdue clearing customs so I thought the probability of her showing up any minute was increasing. But then I thought, suppose -there...

    Started by Outlier‎, 10-23-2014 08:27 PM
    complement, event
    • Replies: 6
    • Views: 1,817
    10-28-2014, 03:22 PM Go to last post
  60. I am not sure how to solve for a probability when N is not given (beginner help).

    
I am having the most trouble with part "a)" but I am comparing the two answers so if you feel inclined to discuss part "b)" as well, I would...

    Started by annaml‎, 11-10-2014 12:02 PM
    • Replies: 6
    • Views: 1,217
    11-10-2014, 12:31 PM Go to last post

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