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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: 30,399
09-30-2005, 09:44 AM
1. ### Random-walk models

Recently read about an example of the random-walk in an old Astrophysics book I picked up when they were cleaning out the college library. Anyone...

• Replies: 0
• Views: 2,551
09-19-2010, 08:36 PM
2. ### Rv

An exam starts at t=0 & is supposed to be over at t=3.The students are asked to "wrap it up" at t=2.5.The relative number of students finishing an...

• Replies: 1
• Views: 1,958
09-19-2010, 03:39 PM
3. ### Easy normal dist

A heating/cooling company advertises that any customer buying an air conditioner during the first 16 days of December will receive a 25% discount if...

• Replies: 3
• Views: 3,290
09-19-2010, 11:47 AM
4. ### Probability Question

I am a little confused on what formula I should use here. I understand if you don't want to give me the answer. I just want to be pointed in the...

• Replies: 3
• Views: 2,654
09-18-2010, 08:50 PM
5. ### URGENT HELP! Markov chain and life insurance

Hi there. For one of my statistics courses, I have been given a question about "Equivalence principle" in regard to life insurance. For this...

• Replies: 0
• Views: 2,590
09-18-2010, 07:36 AM
6. ### random variables

compute xbar=integral xf(x)dx for the continous distribution: exponential:f(x)=u(x)lambda e^-lambdax. compute x^2bar

• Replies: 8
• Views: 3,799
09-18-2010, 02:38 AM

There are three teams in a cross-country race. Team A has five runners, team B has six runners, and team C has seven runners. In how many ways can...

• Replies: 9
• Views: 8,075
09-16-2010, 07:06 PM
8. ### Markov Chain: Absorbtion Probability and Hitting Time

Hi Suppose i have a markov chain with state (0,1,2,3) whose transition matrix looks like this .25, 0, .5, .25 .2, .2, 0, .6 0, 0, 1, 0 ...

• Replies: 3
• Views: 7,018
BGM
09-15-2010, 07:34 AM
9. ### need help with proof issues

1) given: (1+x)^n =SUM nCk X^k, prove that SUM nCk p^k q^n-k =1,where p+q=1 2)prove the general law of addition:P(E1 U E2 U......U En)=SUM...

• Replies: 14
• Views: 4,886
09-14-2010, 04:04 PM
10. ### Challenge

E1,E2,....,En are events; P is the probability that at least one of them occurs. a)show that SUM P(Ei)-SUM{i<j}P(EiEj) <= P<= SUM P(Ei) ...

• Replies: 2
• Views: 2,753
09-14-2010, 01:33 PM
11. ### these problems are due today..HELP

a penny is tossed from a distance onto a large table ruled in 1 inch sqaures.the penny is 3/4 inch in diam.find: 1)probability that it will fall...

• Replies: 5
• Views: 3,292
09-14-2010, 01:30 PM
12. ### Normal Distribution

Hi, I ask this question in relation to a commerce project which I am working on in regards to the probability distributions of operating profits. ...

• Replies: 7
• Views: 3,481
09-14-2010, 11:54 AM
13. ### unfair coin problem

im stuck with a part of a problem which is : An unfair coin (p{h}=p=0.6) is tossed n=20 times. FIND the probability that the number of heads k is...

• Replies: 8
• Views: 6,661
09-14-2010, 01:46 AM
14. ### Hypergeometric distribution problem

A purchaser receives small lots (N = 25) of a high precision device. She wishes to reject the lot 95% of the time if it contains as many as seven...

• Replies: 8
• Views: 6,722
09-13-2010, 02:49 PM
15. ### find the probability of an event given a guassian distribution

This seems like such a simple question, and I should know it, but for some reason I cannot figure it out and cannot find an answer via googling I...

• Replies: 0
• Views: 2,063
09-13-2010, 12:33 PM
16. ### Bayes' Theorem and Conditional Probability

Hello! So I have a question with regards of a mix of results. I want to change the posterior into a form I know. \mathbb{P}\left( \mu | y,H_1...

• Replies: 2
• Views: 2,621
09-12-2010, 06:35 PM
17. ### conditional probability and mgf question

Hi i'm having trouble doing this question, any help would be much appreciated The time needed to defuse the bomb is modeled by a continuous...

• Replies: 2
• Views: 4,741
09-12-2010, 05:44 PM
18. ### Absolute risk reduction

• Replies: 0
• Views: 3,162
09-12-2010, 03:38 AM
19. ### can anyone help on this one?

Given two i.i.d uniform random points x and y on the interval , what is the average size of the smallest of the three resulting intervals?

• Replies: 4
• Views: 2,463
09-11-2010, 10:04 AM
20. ### Die throwing game

A fair die is thrown a number of times and every time we count the number of dots (cumulative), until the total number of dots is bigger than or...

• Replies: 7
• Views: 4,844
09-10-2010, 02:37 PM
21. ### Sampling distributions of estimates question?

Hi there, I'm stuck on a question regarding the chap. in our course called: Sampling distributions of estimates. Here is the question: My thoughts...

• Replies: 3
• Views: 5,352
09-10-2010, 06:16 AM
22. ### what is predictive power?

Can anyone please tell me what is meant by 'predictive power' of a statement? what is it represented as? Thanks

• Replies: 0
• Views: 5,488
09-08-2010, 07:20 PM
23. ### sample percentage contained within symmetric limits

Hi! Thank you in advance for assisting with my question. I am working on a probability question and am able to answer almost all of it except one...

• Replies: 3
• Views: 23,133
09-08-2010, 10:57 AM
24. ### My probability practise

Hi, I am just trying to improve my probability concepts.. I came across this question.. Just let me know if I am correct? Thanks here is the...

• Replies: 4
• Views: 5,094
BGM
09-08-2010, 04:30 AM
25. ### 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: 4,226
09-07-2010, 04:18 AM
26. ### Binomial distribution variace q

Given a scenario where there is a true statistic - proportion voting yes in a vote denoted by p ,we sample people from the large population, n . ...

• Replies: 0
• Views: 2,224
09-06-2010, 04:24 PM
27. ### Random walk on a clock

Consider the numbers 1, 2,..., 12 written around a ring as they usually are on a clock. Consider a Markov chain that at any point jumps with equal...

• Replies: 5
• Views: 9,663
BGM
09-05-2010, 10:22 PM
28. ### Predicting server load for MMORPG

deleted content

• Replies: 0
• Views: 2,708
09-05-2010, 03:50 PM
29. ### Is it a tricky question?

When many small businesses were surveyed, 82.2% said they employed women in some capacity. Of the businesses that employed women, 17.5% employed no...

• Replies: 6
• Views: 3,432
09-04-2010, 01:55 AM
30. ### [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: 4,185
09-03-2010, 04:47 PM
31. ### Another question

To ascertain the effectiveness of the advertising campaign for the Red Cross Annual Appeal on donations, a telephone survey of 309 Brisbane residents...

• Replies: 3
• Views: 2,218
BGM
09-03-2010, 07:34 AM
32. ### Poisson process, order statistics problem

Starting at some fixed time, satellites are launched at times of a Poisson process with rate lambda. After an independent amount of time having...

• Replies: 1
• Views: 6,556
BGM
09-03-2010, 06:55 AM
33. ### help plz

The Personal Computer magazine surveyed its readers to determine how likely it was that people who planned to purchase their next computer would buy...

• Replies: 1
• Views: 2,498
BGM
09-03-2010, 06:33 AM
34. ### 95% CI is Insignificant, P-Value is Significant

Suppose you're performing a 2x2 contingency table analysis. You do your Chi Square or Fisher Exact test, as appropriate, then you calculate an odds...

• Replies: 2
• Views: 10,057
09-02-2010, 10:21 PM
35. ### Binomial expected value

I think the answer to this is painfully obvious, but I need to be certain. Consider some binomial distribution where the probability of a single...

• Replies: 1
• Views: 3,165
09-02-2010, 12:08 PM
36. ### Poisson process, last arrival in interval

Consider a Poisson process with rate lambda. Let L be the following r.v.: if there is an arrival in , then L is the time of the last arrival in ; if...

• Replies: 1
• Views: 4,568
09-02-2010, 08:48 AM
37. ### project help with poisson distribution

Hi. i am a computer science student and i am given a networking related project to make in my final term. and this project includes statistics in 3...

• Replies: 0
• Views: 2,554
09-01-2010, 09:09 PM
38. ### Poisson process, payment, standard deviation

We have an insurance company that pays out claims at times of a Poisson process, with rate 4 per week. Suppose that the mean payment is 10K dollar...

• Replies: 6
• Views: 7,407
09-01-2010, 09:06 PM
39. ### HELP with Probability Result

HI During the course of some proof, I encountered the following given by the author and I cannot figure for the love of God how he came by this...

• Replies: 0
• Views: 2,872
09-01-2010, 02:42 PM
40. ### the oldest 100

I’m studying activity (number of posts) for the first 100 users on an social network. It is skewness distribution. I am trying to find out if there...

• Replies: 2
• Views: 2,461
09-01-2010, 02:26 PM
41. ### regression of multple populations in one dataset

Hi, I have a dataset (x,y) that contain several populations with their own trends. I would want to perform regression on each one separately, but...

• Replies: 7
• Views: 3,618
08-31-2010, 09:00 AM
42. ### Conditional ev,big problem with definition

I jus dont seem to understand this concept "conditional e.v." I do know the definitions: joint density f_X,Y , conditional density of X given Y=y,...

• Replies: 3
• Views: 3,122
BGM
08-28-2010, 12:26 PM
43. ### Conditional expectation, three exponential distributed r.v.

First post... Let A, B and C be independent exponential distributed random variables with parameters lambda_A, lambda_B and lambda_C,...

• Replies: 2
• Views: 2,586
08-27-2010, 07:20 PM
44. ### Probability Question..urgent

Can somebody help me by solving the below mentioned proble? A survey reports that 62% of callers to a help desk complain about the service if...

• Replies: 5
• Views: 3,515
08-27-2010, 10:00 AM
45. ### Is it possible to calculate a binomial distribution with a non-constant p?

Here's the actual problem I'm faced with. Suppose a segment of dna with 100 mutations (SNPs) which occur at different frequencies from each other and...

• Replies: 4
• Views: 4,516
BGM
08-26-2010, 12:04 AM
46. ### Profit and Probability

Given a game with a probability of 1/x and a payout of y:1 where y=x/2 and a number of players n, where n>x and n%x=0. Build a distribution of...

• Replies: 3
• Views: 4,421
BGM
08-25-2010, 10:22 AM
47. ### True or false?

Is this statement true or false? The central limit theorem says that, as n tends to infinity the distribution of (Y - E(Y))/Standard deviation...

• Replies: 10
• Views: 5,342
08-24-2010, 11:26 PM
48. ### Bayes' Theorem and improper priors

Hello! I know Bayes' Theorem applies to both discrete and continuous probability distributions, and also seeing as how, given certain conditions,...

• Replies: 0
• Views: 2,530
08-24-2010, 02:51 PM
49. ### Central limit problem

Hi, I've been struggling with the below and have no idea how to tackle it. I've looked at the mgf but this doesn't seem to work out. Intuitively I...

• Replies: 3
• Views: 2,998
08-24-2010, 10:30 AM
50. ### Minimization of joint pdf

I want to find out that, for which combination of probability distributions of random variables X and Y, we have minimum joint entropy H(X,Y), ...

• Replies: 9
• Views: 3,041
08-22-2010, 09:05 PM
51. ### Competition scoring problem

Not a homework question; a real scenario that I think should be determinable but I don't know how to... x number of people will enter a poker...

• Replies: 0
• Views: 2,104
GRM
08-22-2010, 02:15 PM
52. ### Hung jury

12 jurors are only able to agree on one count out of 24 while 11 agree on all counts. There is one holdout. How would the likelihood that this...

• Replies: 2
• Views: 3,464
08-21-2010, 08:11 PM
53. ### probability help

:shakeheadCan anyone please help me solve these problem or reccommend which book that i can find on the net to solve these problem Q1.)The...

• Replies: 1
• Views: 4,990
08-19-2010, 09:02 PM
54. ### Calculating Joint Probability

If I have uniform random variables X and Y in the range (a,b), how can I calculate joint probability distribution function p(y,x) for y...

• Replies: 4
• Views: 8,747
BGM
08-19-2010, 02:11 PM
55. ### Density and Median

Help please :confused: The diameter of a ball is a random variable X with the next density: 2x if 0<x<=0.5 1 if...

• Replies: 2
• Views: 2,098
08-19-2010, 12:12 PM
56. ### Probability Simulation Software Recommendation

I am looking for software recommendations that will allow me to define a known multi-level game for the purposes of running simulations to determine...

• Replies: 16
• Views: 9,027
08-19-2010, 10:59 AM
57. ### Clustering in SPSS

Hi, This forum has been of great help so far. THANKS. I have another question.:p I have some 170 cases which I want to classify according...

• Replies: 4
• Views: 3,410
08-18-2010, 04:36 PM

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