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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: 30,238
09-30-2005, 09:44 AM
1. ### Binomial

machine has 3 wheels each with 40different numbers, the problem need to find the probabilty of have 3 apples in the case where 1) 3 times in...

• Replies: 14
• Views: 2,808
12-07-2011, 07:02 AM
2. ### Conditional Probability

In order to be qualified for a job, a candidate need to pass 3 exams. If a candidate fail an exam, he can't take the next one. A random candidate...

• Replies: 8
• Views: 3,074
12-06-2011, 08:13 PM
3. ### Please Help - Understanding odds within growing sample (not homework)

This will probably sound pretty easy, but please bear with me. For my own understanding. Say I have a 100 different numbers, and every hour a...

• Replies: 0
• Views: 1,188
12-06-2011, 01:46 AM
4. ### estimating likelihood

First off, this isn't homework question, just trying to figure it out. Imagine you have a box with a window. You make an observation through the...

• Replies: 2
• Views: 2,672
12-05-2011, 02:12 PM
5. ### Probability Distribution Function

Hello guys hope you are good, I have a final question. Suppose that the r.v X represents the radius of a ball and that X has probability...

• Replies: 6
• Views: 2,287
12-05-2011, 12:28 PM
6. ### Probability Density Function

Hello guys I just want my work to be reviewed on this exercise please :) Consider X a random variable with pdf f X (x) = (3/8) * (1-x)^2 if...

• Replies: 4
• Views: 2,654
BGM
12-05-2011, 11:04 AM
7. ### Basic Question

Hi all, I feel a little embarrassed about this, but: what is the rule linking the probability of an event A to the weighted sum of its sub-events?...

• Replies: 2
• Views: 1,364
12-04-2011, 09:43 PM
8. ### Continuous Multi-variablel Distribution question

I'm doing some problems with multi-variable probability distributions and marginal distributions. I think I'm doing them right, but they don't feel...

• Replies: 0
• Views: 886
12-03-2011, 06:00 PM
9. ### normal distribution

Please explain me how to do that? What is the probability that a worker at Random drives more that 15 miles to work if the distribution of all...

• Replies: 7
• Views: 2,255
12-03-2011, 05:21 PM
10. ### Poisson test help!

Hi! I am sitting with a school assignment, but I got stuck on this one. I am suppose to test if my data is Poisson-distributed. The data has a...

• Replies: 4
• Views: 2,397
12-03-2011, 08:33 AM
11. ### Bowl with marbles

Hi there, I have difficulties in resolving this problem: In a bowl we have 5 white marbles and 15 black marbles. What is the probability of...

• Replies: 4
• Views: 2,372
12-02-2011, 03:46 PM
12. ### statistical decision making

:wave: Is it possible to know if whether an error in statistical decision making has been committed in a single study?

• Replies: 4
• Views: 2,512
12-02-2011, 01:41 PM
13. ### Age and the Vancouver Stanley Cup Riot

Practice Question: The information below is public knowledge just released by the BC justice department which shows some people who were charged...

• Replies: 1
• Views: 2,007
12-02-2011, 11:57 AM
14. ### Joint Probability Issues

I'm trying to prepare for a test and going over some practice problems I just found with no solutions, and they've basically led me to believe I'm...

• Replies: 11
• Views: 3,020
12-02-2011, 09:53 AM
15. ### Simple Prob. Question / problem

Hey, Im new to the forum and have loved reading and lurking over the past few weeks. I have a question my friends and I constatnly argue over and...

• Replies: 4
• Views: 1,730
12-01-2011, 04:26 PM
16. ### probability distribution

Hello All, I calculated an average latency value let say 3 units then after observing the network I found that different nodes have the fallowing...

• Replies: 0
• Views: 1,214
12-01-2011, 10:46 AM
17. ### Will decision on H0 depend on Ha

In testing of hypthesis , will the decision of whether to accept or reject depend on the tail of the test ? That is suppose Ha M<0 and Ha!=0. In...

• Replies: 3
• Views: 2,251
BGM
12-01-2011, 02:02 AM
18. ### How to find sign of z

In a normal Distribution 31% of the item are under 45 and 8 % are above 64.Find its mean and SD? In a normal Distribution 31% of the item are under...

• Replies: 1
• Views: 2,235
BGM
12-01-2011, 12:20 AM
19. ### testing of Hypothesis

How to identify if the population is same or different? The heights of six randomly chosen sailors are inches 63,65,58,69,71 and 72.The heights of...

• Replies: 2
• Views: 1,714
11-30-2011, 11:12 PM
20. ### Bayesian Statistics

A logistic regression model for a binary outcome Y given x is given by P(Y=1) = exp(a +bx)/(1+exp(a+bx)) Assume a prior distribution f(a,b)...

• Replies: 3
• Views: 1,869
11-29-2011, 02:44 PM
21. ### Probability of failure for average of multiple samples from normal distribution

Hello - my attempt at this one resulted in a huge calculation, though it seems like a simple problem. There must be a better way! I have a normally...

• Replies: 3
• Views: 3,193
BGM
11-29-2011, 02:23 PM
22. ### Promotion Probability

We are giving away a vehicle as a promotion. Four people will be selected. They will each have a game board in front of them which consists of the...

• Replies: 3
• Views: 1,857
BGM
11-29-2011, 02:09 PM
23. ### Special interest groups want my money

and they say that they lobbied for so-and-so bill and it passed and so I am to conclude that they are effective. Aside from a controlled...

• Replies: 5
• Views: 2,134
11-29-2011, 11:54 AM
24. ### Weighted multivariate hypergeometric distribution?

Hi, I'm writing a simulation where part of it can be done using the following steps: 1. Choose 1 element from with probability without...

• Replies: 4
• Views: 3,202
11-28-2011, 07:05 PM
25. ### help for task in R programming language

This is my task. I don't know how to solve it in R studio. Please help me!!! Simulate: a) 15 values from N(0,1) distribution b) 50 values from...

• Replies: 4
• Views: 2,894
11-28-2011, 12:35 PM
26. ### *Rate of Ruin & Optimal N

For a fair coin toss game, both prob(ruin) & prob(consecutive losses) increases with no. of trials. Is the Rate of ruin .i.e.where prob(ruin)...

• Replies: 13
• Views: 3,874
11-28-2011, 12:21 PM
27. ### Expected value of logarithm of determinant of Wishart-distributed matrix

Does anyone know a simple, or at least tractable, formula for E, where W is a real Wishart-distributed matrix? It seems like there ought to be one,...

• Replies: 3
• Views: 4,900
BGM
11-27-2011, 11:52 PM
28. ### Floor function

A famous pianist will be recording her latest CD of Beethoven's Moonlight Sonata today. Once she arrives to the recording studio she will play the...

• Replies: 2
• Views: 2,143
11-27-2011, 07:51 PM
29. ### Help with a problem.

Problem: 2. Photocards-R’-Us is a photo card printer. For this year, they have found that 10% of the cards they make are of inferior quality (blurred...

• Replies: 7
• Views: 2,382
11-27-2011, 07:40 AM
30. ### Help please with the problem

W is a standard exponential distribution. Q is distributed uniformly on W and Q are independent. R=sqrt(2W) -pi/2<=a<=pi/2 - constant. ...

• Replies: 1
• Views: 1,565
11-27-2011, 03:03 AM
31. ### Probability & Food Poisoning

Could the probability of this situation be calculated? Seven of my family members contracted food poisoning. The health department says we must of...

• Replies: 1
• Views: 4,997
11-26-2011, 06:10 PM
32. ### Monte carlo conditioning

I am trying to learn how to reduce variance with conditioning. page 15 in these lecture notes: http://www.columbia.edu/~mh2078/MCS_Var_Red1.pdf ...

• Replies: 13
• Views: 3,036
alf
11-26-2011, 10:43 AM
33. ### Complicated Probability

Q1. Suppose that four regular 6-sided dice are flipped. 1.What is the probability of a "three-of-a-kind" that is, three of the dice show the same...

• Replies: 1
• Views: 1,797
BGM
11-23-2011, 01:53 AM
34. ### Probability Problem - How many events needed?

I am trying to figure out how to calculate how many samples of a population I would need to take in order to get a true representation of the total...

• Replies: 1
• Views: 1,930
BGM
11-22-2011, 02:47 PM
35. ### help please probability

A Lumber Company has three sawmills which produce boards of different lengths. The following table is a joint frequency distribution based on a...

• Replies: 1
• Views: 3,499
11-22-2011, 10:24 AM
36. ### probability strings

So I am having trouble with a homework problem. its called probability strings. Take 6 pieces of twine, each about 1 foot long. Place the six...

• Replies: 3
• Views: 2,493
BGM
11-21-2011, 02:18 PM
37. ### permutation questions

Having a lot of trouble with this question and subquestions below. I answer each one and just wondering if on the right track? You belong to a...

• Replies: 0
• Views: 1,731
11-20-2011, 10:37 PM
38. ### please i need help with my HW

hello i have question in my home work that i was tried to solve it but unfortunate i can't the question: Harrison Water Sports has three...

• Replies: 4
• Views: 4,904
11-19-2011, 02:37 PM
39. ### Characteristic function of the Gamma distribution

I have not been able to find anywhere a rigorous derivation of the characteristic function of the Gamma distribution. Any suggestions?

• Replies: 3
• Views: 16,139
11-18-2011, 03:41 AM
40. ### Confidence interval estimate - distribution binomial, variable when positive

Hi, Here is my situation: I have a sampling of 60 bills on a population of size 2300. On that sampling, 20 have an error, i.e they have been...

• Replies: 2
• Views: 2,939
BGM
11-18-2011, 02:07 AM
41. ### Need help with joint distribution involving cauchy distributions

Okay so I know that help is only given to those who show effort, but I'm totally stuck on this one, I don't even know where to start. I know what the...

• Replies: 3
• Views: 2,906
BGM
11-17-2011, 12:48 AM
42. ### Help required with a linguistics-related probability problem

Hello all, As someone with very little background in probability theory, I have come across a problem in the writing of my linguistics MSc thesis...

• Replies: 6
• Views: 2,046
11-16-2011, 03:34 PM
43. ### Converting a Wide Sense CycloStationary process into a Wide Sense Stationary process

Hello everybody :) I have a bit of a problem with understanding the conversion from a WSCS process X(t) to a WSS process Y(t) = X(t - \Delta) ....

• Replies: 0
• Views: 1,960
11-16-2011, 05:36 AM
44. ### Independence between x1 and x2+x3+,,,+xn

Hi, I've wondered whether X1 and X2+X3+,,,+Xn(=Z) are stochastically independent or not where X1, X2, ,,, Xn ~iid poisson(Lamda). And Today, I...

• Replies: 1
• Views: 2,162
BGM
11-16-2011, 02:35 AM
45. ### Probability Question

Hi guys, I need some help with this question, I don't have answers, not even final, so any attempt is useless... from an urn with 10 balls...

• Replies: 1
• Views: 1,671
BGM
11-16-2011, 02:09 AM
46. ### Question about exponential distribution

Okay, because P(Y) is an exponential function with mean of 10, I know a=1, B=10 P(Y) = (1/B)e^(-y/B), or (1/10)e^(-y/10). I'm stuck with what to do...

• Replies: 3
• Views: 6,612
BGM
11-16-2011, 12:00 AM
47. ### a question for Makov inequality

Given 0<\lambda<1, can we show \mathrm{P}\le \sum _{i=1}^{n} E/\epsilon^{\lambda}? I think we can get the result by Markov inequality if we know...

• Replies: 3
• Views: 3,535
11-15-2011, 05:49 PM
48. ### Trivial question

Hi All, This is my first post here so be gentle. I've the following question: Suppose you have a parameter X, given by X=g(Y), that could only...

• Replies: 6
• Views: 2,566
11-15-2011, 06:58 AM
49. ### joint distribution of f(x,y)

joint distribution f(x,y) = (1/4)xy if 0<x<2, 0<y<2 = 0 otherwise how to find P(XY<2)? I wrote it out as ∫(from 2...

• Replies: 4
• Views: 3,037
11-15-2011, 02:21 AM
50. ### show that the sum of e(i) = 0 and the sum of e(i)*Yhat(i) = 0

Consider a usual multiple linear regression model: Y = X β + ε where Y is a (n x 1) response vector, X is a (n x p) matrix with its first column...

• Replies: 16
• Views: 14,512
BGM
11-14-2011, 02:40 AM
51. ### A problem using Bayes Inference

This is our Master Qualify Exam problem, please help! Thanks! In a large national park, the number of raccoons in a randomly-picked acre is a...

• Replies: 1
• Views: 2,487
BGM
11-14-2011, 12:27 AM
52. ### A probability confusion

There are two packs of cards. pack A and pack B. A = {11, 12, 13, 15, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 31, 32} B = {11. 13. 15. 21. 22, 35}...

• Replies: 1
• Views: 2,852
BGM
11-14-2011, 12:03 AM
53. ### A two-outcome game on a limited budget: the probability of being busted over n tries

Hello, My question does not regard a piece of homework, but I have become stuck trying to solve a statistical problem and I would really...

• Replies: 2
• Views: 2,200
BGM
11-13-2011, 03:37 AM
54. ### 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...

• Replies: 1
• Views: 2,416
BGM
11-11-2011, 05:27 AM
55. ### CDF of difference of chi squared random variables

Hi, I posted this question under "Probability Theory" and got no response. Maybe I'd have better luck here? I'm interested in obtaining a...

• Replies: 1
• Views: 8,622
BGM
11-10-2011, 03:50 PM
56. ### statistics of sinc function with normal argument

Hi, Can anyone point me to the pdf, cdf, moments, etc of y = sinc(x) = sin(pi*x)/(pi*x) where x ~ N(0,s^2)? Thanks!

• Replies: 0
• Views: 3,082
rhz
11-10-2011, 01:21 PM
57. ### probability question

I have a probability question. It also relates to computer networks but I figured I would try posting it here. The question deals with packets...

• Replies: 1
• Views: 3,263
BGM
11-10-2011, 12:55 AM
58. ### What is the meaning of kurtosis?

I found in Wikipedia that kurtosis is measurement of peakiness of the famous bell curve. If kurtosis is more than 3, it is kind of peaky, if kurtosis...

• Replies: 10
• Views: 25,194
11-09-2011, 12:39 PM
59. ### Consistent Estimator

I'm new here so i'm not sure what is wrong with my tex (i cant get +)so I will write the correct information under my tex lines A balanced one way...

• Replies: 4
• Views: 6,222
alf
11-09-2011, 11:41 AM

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