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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: 30,331
    09-30-2005, 09:44 AM Go to last post
  1. probability,variance,moment generating function

    1. Let X denote the mean of a random sample of size 75 from the distribution that has the pdf f (x)=1, 0 <=x<=1. Calculate P (0.45 <X< 0.55). 2....

    Started by thandu3‎, 03-01-2009 12:10 PM
    • Replies: 1
    • Views: 4,277
    03-01-2009, 01:58 PM Go to last post
  2. RV distribution with hint

    Let x be a RV that counts the number of clients that enter some place. It is initialized to 0 at time 0. The number of clients that enter per second...

    Started by yossigi‎, 12-29-2010 09:19 AM
    • Replies: 4
    • Views: 4,276
    12-30-2010, 03:55 PM Go to last post
  3. Solving Complex Equation with Variable Factorials and Exponents

    The Problem: A very important 20-bit message is being sent via satellite, and there is a 5% probability that any single bit will be received...

    Started by nickcherryjiggz‎, 10-23-2006 09:59 PM
    • Replies: 1
    • Views: 4,275
    10-24-2006, 11:15 AM Go to last post
  4. How to prove that an unbiased estimator does NOT exist for a parameter?

    Hello all, How can I prove that an unbiased estimator does not exist for a particular parameter? What are the methods usually used to do this? ...

    Started by Guillaume‎, 11-06-2010 07:00 PM
    • Replies: 0
    • Views: 4,274
    11-06-2010, 07:00 PM Go to last post
  5. Mutual Information and Probability

    Hi, This is my first post in this forum :) I have some knowledge on statistics and probability but im stuck on a experiment im doing. ...

    Started by juanchoc‎, 12-17-2007 02:03 PM
    • Replies: 0
    • Views: 4,272
    12-17-2007, 02:03 PM Go to last post
  6. Help please! I can't seem to make sense of these!

    A test consists of 10 true/false questions. To pass the test a student must answer at least 6 questions correctly. If a student guesses on each...

    Started by LES‎, 02-27-2008 03:53 PM
    • Replies: 1
    • Views: 4,270
    02-27-2008, 04:34 PM Go to last post
  7. Binomial distribution ! Need help!

    Hi, plz tell me if method to solve these question is correct or not! q)In a call centre 180 calls are received at random over a period of 12...

    Started by Shashank Prasad‎, 06-28-2014 11:05 AM
    • Replies: 0
    • Views: 4,268
    06-28-2014, 11:05 AM Go to last post
  8. Exponential or Lognormal: which distribution should I use?

    Hi! Which distribution should I use if my set of data is divided into subgroups and each subgroup is either lognormal or exponential? Please help,...

    Started by whattodo‎, 05-30-2012 05:38 AM
    • Replies: 0
    • Views: 4,267
    05-30-2012, 05:38 AM Go to last post
  9. probability

    Can anybody help me to solve this problem ?please :( 1-In a certain community, 50% of the people have disease A, 15% have disease B and 5% have...

    Started by meme‎, 03-18-2006 07:42 AM
    • Replies: 6
    • Views: 4,265
    04-03-2006, 11:06 AM Go to last post
  10. Combination/Permutation???

    Ok here is the problem I have four m$ms and three friends How many ways can i divide the m&ms considering i can give each friend 0, 1, 2, 3 or...

    Started by gobulldogs‎, 11-12-2007 07:22 PM
    • Replies: 1
    • Views: 4,259
    11-15-2007, 10:15 PM Go to last post
  11. Percentile??

    Exam scores were normal in BIO 200. Jason's exam score was one standard deviation above the mean. What percentile is he in? I do not know where to...

    Started by staffordsc‎, 03-30-2009 09:19 PM
    • Replies: 1
    • Views: 4,258
    03-31-2009, 01:41 AM Go to last post
  12. Convergence problem in probability

    Hi, the following question keeps coming up in recent year's exam and i'm unsure how to do it fully: Q. If the sequence of random variables...

    Started by qwertykeyboards‎, 05-19-2010 05:44 AM
    • Replies: 1
    • Views: 4,257
    05-19-2010, 10:18 AM Go to last post
  13. Normal Curve

    Calculate the standard score of the given X value, X=61.6 where mu=66.7 and standard deviation is 65.2 I got a negative score of .078, that can't...

    Started by cannoli‎, 01-18-2007 12:15 PM
    • Replies: 1
    • Views: 4,249
    01-19-2007, 10:08 PM Go to last post
  14. expected gain

    Let's say the price people are willing to pay for something is listed below, so 9 people are willing to pay 3 while only 1 is willing to pay 12. How...

    Started by Outlier‎, 07-16-2011 03:03 PM
    • Replies: 6
    • Views: 4,249
    07-17-2011, 11:28 AM Go to last post
  15. Probability Help!!! AGAIN

    mean is 4300 standard deviation is 750 compute the probability that more than 5000 acres will be burned P(x > 5000) 5000-4300/750 ...

    Started by sharons‎, 09-15-2007 12:14 AM
    • Replies: 3
    • Views: 4,246
    09-21-2007, 07:16 AM Go to last post
  16. expected value and variance derivation (kernel)

    Hi there, I am studying kernel smoothing from the book of Mand. I will appreciate any help because I am stuck all day. (p15) I am stuck at the...

    Started by leo nidas‎, 11-20-2009 04:59 PM
    • Replies: 0
    • Views: 4,246
    11-20-2009, 04:59 PM Go to last post
  17. Question on standard unit problem

    Mutual Fund A has an average return of $25,000 and Mutual Fund B has an average return of $5,000. The standard deviation for Fund A is $10,000 and...

    Started by rossini‎, 09-03-2009 12:23 AM
    • Replies: 8
    • Views: 4,245
    09-03-2009, 11:56 AM Go to last post
  18. normal approx / continuity correction

    One statistic used to assess professional golfers is driving accuracy, the percent of drives that land in the fairway. Driving accuracy for PGA...

    Started by tahiti323‎, 10-20-2011 10:27 PM
    • Replies: 2
    • Views: 4,245
    10-21-2011, 10:37 AM Go to last post
  19. Building a Multivariate Exponential Distribution...

    hey everyone! so when i asked about the Multivariate Poisson i was pointed in the right direction and was able to come up with a much decent answer...

    Started by spunky‎, 03-19-2012 05:40 PM
    • Replies: 2
    • Views: 4,242
    03-19-2012, 06:44 PM Go to last post
  20. Unhappy Random Number Generator

    I know this is a message board for homework but I have a question for something that I'm actually doing at work. Its been three years since my...

    Started by fperri‎, 06-05-2007 11:08 AM
    • Replies: 1
    • Views: 4,241
    06-08-2007, 04:06 AM Go to last post
  21. university probability problems, help much appreciated.

    Hi guys, I am really struggling with my university statistics work. Probablity has been really difficult. I have asked my tutors for help, but...

    Started by jon2008‎, 10-27-2008 05:09 PM
    • Replies: 1
    • Views: 4,236
    10-27-2008, 06:14 PM Go to last post
  22. Probabilities involving sample means

    I'm having trouble with this, I need help! I construe that the heights of hobbits are approximately normally distributed with mean 36 inches and...

    Started by chicklet0323‎, 11-28-2007 11:09 PM
    • Replies: 0
    • Views: 4,235
    11-28-2007, 11:09 PM Go to last post
  23. Probability and standard deviation

    Dear Members, I am struggling with this particular problem and I am not sure about my answers. If anybody could verify them that would be of great...

    Started by krspatgaon‎, 10-25-2013 01:11 AM
    • Replies: 5
    • Views: 4,235
    11-25-2013, 12:10 AM Go to last post
  24. Unhappy How can you simplify or approximate (p - 1)!/([p^(x-1)](p-x)!)?

    Essentially I need to compute the values of (x - 1)!/((x - p)!) for p = 61,113,205 (population of UK) and x = 1, 2, 3, ... p This should show the...

    Started by tuna‎, 03-28-2009 03:30 PM
    • Replies: 3
    • Views: 4,232
    03-28-2009, 04:30 PM Go to last post
  25. survey question & conversion to variable

    I'm assuming this question will be an ordinal categorical variable. I added the "other" category since there are lots of methods used for dosing. If...

    Started by kalbright36‎, 01-09-2006 01:45 AM
    • Replies: 5
    • Views: 4,231
    01-10-2006, 11:30 PM Go to last post
  26. Proportion question

    Can someone please help, I don't know why but this question is giving me trouble-I am having a mental block. Thanks. The distance that one...

    Started by rkain‎, 06-26-2010 01:21 PM
    • Replies: 1
    • Views: 4,227
    06-26-2010, 01:28 PM Go to last post
  27. Sampling from an inverse Chi Square-Distribution

    Hi all, I got some issues concerning the Chi-Square-Distribution. I am currently trying to implement MCMC-methods in order to determine the...

    Started by paul85‎, 05-26-2011 02:12 PM
    • Replies: 2
    • Views: 4,226
    05-26-2011, 05:25 PM Go to last post
  28. 2012 Presidential Election Probability Calculator

    I'm trying to create a calculator to determine odds of Democrats winning the 2012 US Presidential election. I take the electoral college map from...

    Started by tjc23‎, 07-30-2011 09:44 AM
    • Replies: 2
    • Views: 4,222
    07-31-2011, 02:25 AM Go to last post
  29. calculating stddev from ci - gamma dist

    Hi all, I'm trying to figure out the standard deviation of a gamma distribution armed only with the mean and 90% confidence interval (1.86 for...

    Started by jefflovejapan‎, 09-05-2010 09:14 PM
    • Replies: 9
    • Views: 4,216
    09-07-2010, 04:18 AM Go to last post
  30. Probability: Poplar Tree Lifespan

    The life of one species of poplar tree is normally distributed with mean 20 years and standard deviation 2.3 years. (a) If one tree is selected at...

    Started by JeanetteR‎, 12-16-2008 01:33 AM
    • Replies: 1
    • Views: 4,215
    12-16-2008, 01:45 AM Go to last post
  31. I'm looking for solved probability problems online

    I'm looking for a PDF or other online source of solved probability problems of the kinds typically encountered in college classes. I'd like to find...

    Started by phcorcoran‎, 08-03-2009 05:41 AM
    • Replies: 0
    • Views: 4,214
    08-03-2009, 05:41 AM Go to last post
  32. Question Probability involving college admissions

    Here is the question: College admissions: For high school students graduating in 2010, college admissions to the nation’s most selective schools...

    Started by somethingclever‎, 10-20-2012 07:37 PM
    • Replies: 10
    • Views: 4,213
    10-21-2012, 11:55 AM Go to last post
  33. Probability of sequential deaths and dates

    Hi all, I hope today finds you well and in good spirits. I'm trying to develope a statistical model and haven't done so in years. Any help is...

    Started by statistically_challenged‎, 10-27-2006 07:13 AM
    • Replies: 0
    • Views: 4,212
    10-27-2006, 07:13 AM Go to last post
  34. Complements, Unions, and Intersections

    Help!:shakehead In a market research survey participants were asked if they put ketchup directly on their fries or along side. 26% of men said...

    Started by tmwawa‎, 01-28-2007 12:09 PM
    • Replies: 4
    • Views: 4,211
    01-28-2007, 01:57 PM Go to last post
  35. Binary Logistic Regression Event Prob - Minitab

    Good Day To All, I am new to the site and could use a little clarification regarding the following: In Minitab, I have conducted a Step-Wise...

    Started by optomist1‎, 06-25-2010 10:31 AM
    • Replies: 1
    • Views: 4,210
    06-25-2010, 03:00 PM Go to last post
  36. Too large a difference between seasonally adjusted and unadjusted employment numbers

    Hi, I am kind of confused about the large difference between seasonally adjusted and Non-adjusted figures of weekly initial claims published by...

    Started by musicgold‎, 01-19-2009 10:09 AM
    • Replies: 1
    • Views: 4,208
    01-23-2009, 04:21 PM Go to last post
  37. construction project probability

    A construction project is about 2 months away from the scheduled completion date. Based on the progress of the project to date, the contractor...

    Started by fool‎, 03-23-2011 06:11 AM
    • Replies: 3
    • Views: 4,206
    03-25-2011, 12:13 AM Go to last post
  38. convergence and expectation

    Let X_1, X_2, ... be independent and identically distributed random variables with the characteristic function \varphi_X(t) = E(e^{itx}) =...

    Started by madara123‎, 06-18-2011 09:17 PM
    • Replies: 3
    • Views: 4,202
    06-19-2011, 08:20 AM Go to last post
  39. probability question

    The probability that an individual recovers from an illness in a one-week time period without treatment is 0.1. Suppose that 20 independent...

    Started by bartowski‎, 04-28-2012 09:39 AM
    • Replies: 1
    • Views: 4,202
    04-28-2012, 09:55 AM Go to last post
  40. 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: 4,202
    11-24-2014, 02:46 PM Go to last post
  41. My brain is oozing out of my head!

    I am very lost. I have read my notes and text book but this teacher has me very confused. Can anyone fill me in? The number of semester hours of...

    Started by ot180‎, 04-11-2006 10:21 PM
    • Replies: 1
    • Views: 4,201
    04-11-2006, 10:39 PM Go to last post
  42. Theorem of Total Probabilities

    I appreciate your help.

    Started by af_231‎, 03-28-2011 06:49 AM
    • Replies: 1
    • Views: 4,199
    03-28-2011, 10:51 AM Go to last post
  43. SOA Exam-P Practice

    Anybody studying for the Society of Actuaries Exam-P? I am studying from the practice questions provided on the website. Any good study materials...

    Started by catamount‎, 12-16-2010 08:31 PM
    • Replies: 2
    • Views: 4,198
    12-17-2010, 04:58 PM Go to last post
  44. Children Gender Split Probability Question

    Hello everyone, I've another question on probability (: A randomly chosen family has 4 children. Assume that the chance of having a son or a...

    Started by mysterdusk‎, 09-30-2010 09:56 AM
    • Replies: 1
    • Views: 4,196
    09-30-2010, 10:02 AM Go to last post
  45. E(X) and variance of i.i.d without integration

    How would you calculate the Expected value of a independent identically distributed seq. of continuous RVs without using integration? i don't know...

    Started by maybe‎, 03-08-2011 07:06 PM
    • Replies: 3
    • Views: 4,196
    03-08-2011, 11:50 PM Go to last post
  46. Exclamation Simple birth-death process

    Hello, I am working on a simple birth-death process problem, I have been asked to find the distribution function for the extinction time T. So T...

    Started by Amelia‎, 11-08-2009 05:27 AM
    • Replies: 0
    • Views: 4,195
    11-08-2009, 05:27 AM Go to last post
  47. Closed form formula for the non central moments of normal distribution?

    What is the formula for the nth non-central moments of the normal distribution.

    Started by stephanie‎, 01-25-2014 08:05 PM
    • Replies: 1
    • Views: 4,192
    01-25-2014, 08:50 PM Go to last post
  48. [Homework help] Binomial distribution questions

    After the BP oil crisis in the Gulf, sixty percent of Americans are in favor of the government’s moratorium on deepwater oil drilling. Out of the...

    Started by Tote6000‎, 09-02-2010 09:07 PM
    • Replies: 9
    • Views: 4,183
    09-03-2010, 04:47 PM Go to last post
  49. Pair multiple dice

    Help I have developed a mental block, and despite searching I cannot find any information about how the following works. My problem is...

    Started by NoobSaibot‎, 06-12-2006 09:20 PM
    • Replies: 4
    • Views: 4,179
    06-17-2006, 11:04 PM Go to last post
  50. Probability Density

    The joint density function of X and Y is given by f (x, y) = xe^(-x(y+1)) x > 0, y > 0 (b) Find the density function of Z = XY. How is it...

    Started by pickboys‎, 03-29-2012 03:35 AM
    • Replies: 2
    • Views: 4,178
    04-05-2012, 05:40 PM Go to last post
  51. I would just like the answers so I can work backwards and know how to do it

    The question is: Shutouts in the National Hockey League occur randomly and independently at a rate of 1 every 20 games. Calculate the probablity...

    Started by frankiee‎, 11-25-2007 02:49 PM
    • Replies: 2
    • Views: 4,177
    12-07-2007, 12:49 PM Go to last post
  52. correlated binary variables

    I have the following problem: let X = {x_i}, and Y = {y_i} be two vectors of binary variables with n elements (taking the value 0 or 1 with some...

    Started by torkel‎, 03-11-2010 02:01 PM
    • Replies: 2
    • Views: 4,177
    03-12-2010, 03:56 AM Go to last post
  53. Exclamation Exam Question. Conditional Prob and Dist Functions

    Hi Everyone. I was hoping somebody could help me with this question. I think i have confused myself to a point where I am just lost on it. X...

    Started by woody198403‎, 05-09-2008 02:16 AM
    • Replies: 3
    • Views: 4,176
    05-09-2008, 06:11 PM Go to last post
  54. Probability Mass Function

    I have a question about probability mass function. I understand the simple problems with a toss of a fair coin etc. I have a slightly more...

    Started by LizzyB‎, 10-07-2010 11:04 PM
    • Replies: 1
    • Views: 4,176
    10-07-2010, 11:23 PM Go to last post
  55. Probability Question

    I need help solving this question: P(X^2 > Y) = 0.025 where X^2~X^2(21)

    Started by skyraptor‎, 06-03-2008 07:38 PM
    • Replies: 6
    • Views: 4,173
    06-04-2008, 01:26 PM Go to last post
  56. Normal Distribution

    Hello, I've just started reading a stats book, but I think this is still a prob question. I haven't done any prob/stats in 3 years, and I never...

    Started by Mirey‎, 04-02-2011 08:43 AM
    • Replies: 1
    • Views: 4,168
    04-02-2011, 09:01 AM Go to last post
  57. Quantiles for the Wishart distribution

    1234567890

    Started by jessica01‎, 01-25-2011 01:48 PM
    • Replies: 1
    • Views: 4,167
    01-25-2011, 02:26 PM Go to last post
  58. A question on Poisson distribution

    Hi, Let X1 and X2 be Poisson distributed variables with the same mean m and Y be defined as multiplication of X1 and X2 (Y=X1X2). How can i obtain...

    Started by jylces‎, 06-18-2010 06:46 AM
    • Replies: 2
    • Views: 4,165
    06-18-2010, 12:11 PM Go to last post
  59. Conditional Distribution Expectation of E[Y^2]

    I understand that with the Conditional Distribution Expectation of E, it's E(E). How about E? Is the correct formula E(E)?

    Started by StatStudent3‎, 11-18-2010 11:34 PM
    • Replies: 1
    • Views: 4,163
    11-18-2010, 11:38 PM Go to last post
  60. Football Betting Method

    Say I have 3 betting methods on football games. Each system is able to predict the winner with 60% accuracy. Method1: 60% Method2: 60% Method3:...

    Started by shrek‎, 10-02-2008 03:20 AM
    • Replies: 1
    • Views: 4,158
    10-04-2008, 05:00 PM Go to last post

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