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# Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

1. ### 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)...

• Replies: 0
• Views: 30,331
09-30-2005, 09:44 AM
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....

• Replies: 1
• Views: 4,277
03-01-2009, 01:58 PM
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...

• Replies: 4
• Views: 4,276
12-30-2010, 03:55 PM
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...

• Replies: 1
• Views: 4,275
10-24-2006, 11:15 AM
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? ...

• Replies: 0
• Views: 4,274
11-06-2010, 07:00 PM
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. ...

• Replies: 0
• Views: 4,272
12-17-2007, 02:03 PM
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...

• Replies: 1
• Views: 4,270
02-27-2008, 04:34 PM
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...

• Replies: 0
• Views: 4,268
06-28-2014, 11:05 AM
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,...

• Replies: 0
• Views: 4,267
05-30-2012, 05:38 AM

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... • Replies: 1 • Views: 4,259 11-15-2007, 10:15 PM 10. ### 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... • Replies: 1 • Views: 4,258 03-31-2009, 01:41 AM 11. ### 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... • Replies: 1 • Views: 4,257 BGM 05-19-2010, 10:18 AM 12. ### 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... • Replies: 1 • Views: 4,249 01-19-2007, 10:08 PM 13. ### 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... • Replies: 6 • Views: 4,249 07-17-2011, 11:28 AM 14. ### 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 ... • Replies: 3 • Views: 4,246 09-21-2007, 07:16 AM 15. ### 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... • Replies: 0 • Views: 4,246 11-20-2009, 04:59 PM 16. ### 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...

• Replies: 8
• Views: 4,245
09-03-2009, 11:56 AM
17. ### 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...

• Replies: 2
• Views: 4,245
10-21-2011, 10:37 AM
18. ### 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...

• Replies: 2
• Views: 4,242
03-19-2012, 06:44 PM
19. ### 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...

• Replies: 1
• Views: 4,241
06-08-2007, 04:06 AM
20. ### 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...

• Replies: 1
• Views: 4,236
10-27-2008, 06:14 PM
21. ### 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...

• Replies: 0
• Views: 4,235
11-28-2007, 11:09 PM
22. ### 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...

• Replies: 5
• Views: 4,235
11-25-2013, 12:10 AM
23. ### 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...

• Replies: 3
• Views: 4,232
03-28-2009, 04:30 PM
24. ### 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...

• Replies: 5
• Views: 4,231
01-10-2006, 11:30 PM
25. ### 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...

• Replies: 1
• Views: 4,227
06-26-2010, 01:28 PM
26. ### 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...

• Replies: 2
• Views: 4,226
05-26-2011, 05:25 PM
27. ### 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...

• Replies: 2
• Views: 4,222
07-31-2011, 02:25 AM
28. ### 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...

• Replies: 9
• Views: 4,216
09-07-2010, 04:18 AM
29. ### 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...

• Replies: 1
• Views: 4,215
12-16-2008, 01:45 AM
30. ### 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...

• Replies: 0
• Views: 4,214
08-03-2009, 05:41 AM
31. ### 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...

• Replies: 10
• Views: 4,213
10-21-2012, 11:55 AM
32. ### 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...

• Replies: 0
• Views: 4,212
10-27-2006, 07:13 AM
33. ### 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...

• Replies: 4
• Views: 4,211
01-28-2007, 01:57 PM
34. ### 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...

• Replies: 1
• Views: 4,210
06-25-2010, 03:00 PM
35. ### Too large a difference between seasonally adjusted and unadjusted employment numbers

• Replies: 1
• Views: 4,208
01-23-2009, 04:21 PM
36. ### 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...

• Replies: 3
• Views: 4,206
03-25-2011, 12:13 AM
37. ### 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}) =...

• Replies: 3
• Views: 4,202
BGM
06-19-2011, 08:20 AM
38. ### 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...

• Replies: 1
• Views: 4,202
04-28-2012, 09:55 AM
39. ### 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...

• Replies: 2
• Views: 4,202
11-24-2014, 02:46 PM
40. ### 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...

• Replies: 1
• Views: 4,201
04-11-2006, 10:39 PM
41. ### Theorem of Total Probabilities

• Replies: 1
• Views: 4,199
BGM
03-28-2011, 10:51 AM
42. ### 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...

• Replies: 2
• Views: 4,198
12-17-2010, 04:58 PM
43. ### 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...

• Replies: 1
• Views: 4,196
09-30-2010, 10:02 AM
44. ### 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...

• Replies: 3
• Views: 4,196
BGM
03-08-2011, 11:50 PM
45. ### 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...

• Replies: 0
• Views: 4,195
11-08-2009, 05:27 AM
46. ### 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.

• Replies: 1
• Views: 4,192
01-25-2014, 08:50 PM
47. ### [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...

• Replies: 9
• Views: 4,183
09-03-2010, 04:47 PM
48. ### 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...

• Replies: 4
• Views: 4,179
06-17-2006, 11:04 PM
49. ### 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...

• Replies: 2
• Views: 4,178
04-05-2012, 05:40 PM
50. ### 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...

• Replies: 2
• Views: 4,177
12-07-2007, 12:49 PM
51. ### 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...

• Replies: 2
• Views: 4,177
03-12-2010, 03:56 AM
52. ### 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...

• Replies: 3
• Views: 4,176
05-09-2008, 06:11 PM
53. ### 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...

• Replies: 1
• Views: 4,176
10-07-2010, 11:23 PM
54. ### Probability Question

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

• Replies: 6
• Views: 4,173
06-04-2008, 01:26 PM
55. ### 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...

• Replies: 1
• Views: 4,168
BGM
04-02-2011, 09:01 AM
56. ### Quantiles for the Wishart distribution

1234567890

• Replies: 1
• Views: 4,167
BGM
01-25-2011, 02:26 PM
57. ### 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...

• Replies: 2
• Views: 4,165
BGM
06-18-2010, 12:11 PM
58. ### 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)?

• Replies: 1
• Views: 4,163
BGM
11-18-2010, 11:38 PM
59. ### 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:...

• Replies: 1
• Views: 4,158
DAV
10-04-2008, 05:00 PM

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