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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: 30,170
09-30-2005, 09:44 AM
1. ### 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: 9,579
BGM
09-05-2010, 10:22 PM
2. ### 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: 3,488
08-27-2010, 10:00 AM
3. ### 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: 3,259
09-14-2010, 01:30 PM
4. ### Need some help understanding probability theory.

Hello, My probability course has just started and I have a little trouble in preparation for my first quiz tomorrow, understanding some concepts....

• Replies: 5
• Views: 4,906
09-19-2010, 10:02 PM
5. ### Probability Density Function and Cumulative Distribution Function

Hi everybody, If anyone has experience working with probability density functions (pdf), please look these sample problems over and if you could,...

• Replies: 5
• Views: 13,288
09-27-2010, 06:34 AM
6. ### Help with probability..asap plz

An entomologist is studying the effect of a chemical sex attractant (pheromone) on insects. Several insects are released at a site equidistant from...

• Replies: 5
• Views: 6,502
10-01-2010, 05:30 AM
7. ### Probability Mass Function

I am given that X follows the geometric distribution and asked to give the probability mass function for X^2. I know that the probability mass...

• Replies: 5
• Views: 4,943
10-08-2010, 11:23 AM
8. ### NEED HELP with joint density problem

Two RVs X & Y have the jiont density: f(x,y)=a, x^2+y^2<=1 Find the constant a. >>> HOW CAN I SOLVE THIS ???can i say that z=x^2+y^2

• Replies: 5
• Views: 3,300
BGM
10-08-2010, 12:48 AM
9. ### Probability density function

I have a problem on one part of the four parts of this question. Here it is: The probability density function of the time customers arrive at a...

• Replies: 5
• Views: 11,743
10-08-2010, 03:00 PM
10. ### probability , confusing table

I am really confused with the table , I am not sure if I am doing it right, Can you have a look at my answers? 3. In smoking related research,...

• Replies: 5
• Views: 2,654
10-12-2010, 07:23 PM
11. ### Pretty Basic probability question

Thanks guys. Figured it out!

• Replies: 5
• Views: 3,152
10-14-2010, 11:09 AM
12. ### Confidence Interval homework check if correct

1. 68.6 I did this by solving for x with this equation .004=1.96(.14/sqroot of x) 2.84.72% I found this by finding zscore for 1.43 which was...

• Replies: 5
• Views: 4,432
10-19-2010, 04:56 PM
13. ### prob. questions

Let we have 3 urns with a white, b black balls in each urn. We choose one ball from urn 1 and transform it to urn 2. Then, choose one ball from urn 2...

• Replies: 5
• Views: 2,912
10-20-2010, 05:01 PM
14. ### help with beta distribution

for this question How do i show that X1~Beta(a1,a2+a3) whats a hint to show this?

• Replies: 5
• Views: 4,230
11-02-2010, 06:35 PM
15. ### Propability with variable

Hi , I need help with my statistics homework. I'm not realy good at statistics :shakehead more green. So will be very great to get some help.;)

• Replies: 5
• Views: 2,757
11-03-2010, 03:09 PM
16. ### How can we prove a text is written by a human beign?

A computer prints two papers, on the first paper is written, "ASDDSF DFGDF ERSDKUF DFD RRVFDSDA" on the second paper is written, "HOW ARE YOU...

• Replies: 5
• Views: 4,594
11-18-2010, 06:15 PM
17. ### help with chi square freedom sums

How do i show that the a + is a ? How can i use moment generating functions to do this?

• Replies: 5
• Views: 5,197
11-25-2010, 10:12 PM
18. ### Finding pdf of Quotient

Let X ~ Uniform(0, 1) and Y ~ Exponential(1) be independent. Find pdf of X/Y For Y/X case, I understand that the pdf of this is integral of...

• Replies: 5
• Views: 3,036
11-30-2010, 05:04 PM
19. ### Need a formula for a one of these gamma densities

For the integral from for x^(s-1) * e^(-lambda * x) You have s and lambda, so is the final answer for this (s-1)! / lambda^(s) ? Or is it (s-1)!...

• Replies: 5
• Views: 3,673
11-30-2010, 12:26 AM
20. ### Help with a hw question

I am taking my first probability course and need some help. I am working on some homework. The question I am on now asks... Consider...

• Replies: 5
• Views: 5,169
BGM
12-04-2010, 12:51 PM
21. ### Moment Generate function

Suppose we were to play a game with the following rules. We pay seven dollars to play the game. We then flip a (possibly biased, probability of heads...

• Replies: 5
• Views: 4,615
12-06-2010, 04:27 PM
22. ### Help with Probability!

Hi. I came across a few questions tht i came across while studyin for a probability chapter. Just a little request, im very new to probability so u...

• Replies: 5
• Views: 18,835
12-09-2010, 10:41 AM
23. ### Possion question

Hey guys, i have my final next week and i been studying for it. i been doing the question in the book, but i there is a questions that i really do...

• Replies: 5
• Views: 3,212
12-10-2010, 10:13 PM
24. ### probability help

Hi I am new to statistics and have been given the following question: Suppose X~B(16, 0.75) How do I calculate E(X) and V(X)? All the...

• Replies: 5
• Views: 2,517
ccs
12-13-2010, 01:59 PM
25. ### Geometric RV

So i have a question... If X is a geometric RV with parameter p (the geometric definition where x=0,1,2,3...) 1. compute the distribution of...

• Replies: 5
• Views: 6,664
12-14-2010, 09:08 PM
26. ### Uniform Disk Help Grovel

Let (x,y) be uniformly distributed over x^2+y^2\leq1, the unit disk. 1. Work out an expression for E{X^mY^n} I have found that the marginal...

• Replies: 5
• Views: 3,550
BGM
12-16-2010, 02:44 PM
27. ### Probability for 20 people

Hi, I'm not a stats student, I'm a university student reviewing some literature and I'm interested in some of the statistics related to it and how...

• Replies: 5
• Views: 4,377
12-16-2010, 06:55 PM
28. ### Probability Question

Hi Guys, I'm a novice at probability and would be very appreciative of some assistance with this question: If Company A (car manufacturer)...

• Replies: 5
• Views: 3,883
01-14-2011, 04:21 AM
29. ### What type of sampling is this....`

First of all sorry if this is in the wrong section but i think is the section that applies most! I want to distrubute questionaires to five groups...

• Replies: 5
• Views: 2,914
03-08-2011, 11:23 PM
30. ### Roulette & interesting binomial question

Hi everyone, Since I have some mathematical knowledge my friend asked me to help him out with a question with which I'm struggling: "On a...

• Replies: 5
• Views: 5,335
02-08-2011, 06:07 AM
31. ### probability problem

For detecting a disease, a test gives correct diagnosis with probability 0.99. It is known that 1% of the population suffers from this disease. If a...

• Replies: 5
• Views: 5,849
03-10-2011, 08:19 AM
32. ### Binomial Distribution Problem - How to interpret the given information

Your company is running an audit on the Sleaze Company. Because Sleaze has a bad habit of issuing incorrect invoices, the focus of your audit is on...

• Replies: 5
• Views: 8,175
10-04-2011, 01:58 PM
33. ### on the probability density function

Good morning to all. I have a question: I have a data set X={x_1, x_2, ... , x_N} with probability density function P(x) (suppose continuous); if I...

• Replies: 5
• Views: 3,973
03-07-2011, 04:35 PM
34. ### Likelihood Ratio Test Statistic

Hi guys, Heres my problem: ********** Data X1,X2,....,Xn, n = 20, are available of numbers of flaws per 10 metres of bales of a manufactured...

• Replies: 5
• Views: 10,529
BGM
03-08-2011, 01:43 AM
35. ### looking for some help with my highschool homework

hey everyone, sorry for the english i'm not a native. i'm was hoping to you could help me a little bit with a few homework assignments i have ...

• Replies: 5
• Views: 3,283
03-07-2011, 03:05 PM
36. ### Given Joint Density Function

f(x) { x(1+3y^2)/4 0<x<2, 0<y<1 0 otherwise 1. Find g(x), h(y) 2. Find f(x|y) 3.Evaluate P(1/4<x<1/2 | Y=1/3) in getting g(x) is this...

• Replies: 5
• Views: 4,625
BGM
03-10-2011, 04:10 PM
37. ### Probabilty : Round permutation problem

A garland is to be formed with five roses and five dahlias. If they are arranged randomly, find the probability of roses and dahlias being arranged...

• Replies: 5
• Views: 4,811
03-14-2011, 09:53 AM
38. ### Conditional Probability

Hello!!! Can anyone help me with this problem??...please!!! In relation to Equation P(A│B)=P(AB) / P(B) Show that: P(A│B)P(B)=P(B│A)P(A)

• Replies: 5
• Views: 2,666
03-20-2011, 09:12 PM
39. ### Conditional Expectation Problem

Hi all I need to solve the following problem: If E(X|Y)=Y and E(Y|X)=X, prove that X=Y almost surely. Seems like I'll need to use the...

• Replies: 5
• Views: 4,697
BGM
03-26-2011, 12:36 PM
40. ### Equation involving uniformly distributed variable

Let U be a random variable uniformly distributed on , and let X be a dependent variable such that X^U = a for some number a (X^U means X to the power...

• Replies: 5
• Views: 3,059
BGM
03-31-2011, 02:29 PM
41. ### Alternative to chi-squared test needed

Hi all. I need a goodness of fit test for a situation in which a chi-squared test isn't appropriate - where the sum of the expected values does...

• Replies: 5
• Views: 8,037
04-15-2011, 05:23 PM
42. ### Uniform Probability Distribution

The driving distance for the top 100 golfers on the PGA tour is between 284.7and 310.6 yards (Golfweek, March 29, 2003). Assume that the driving...

• Replies: 5
• Views: 19,829
BGM
04-11-2011, 01:53 PM
43. ### Homework Help - Balls in Urn problem (hypergeometric distribution?)

Hi all, I need help with the following problem: The urn contains 5 black and 8 red balls. You close your eyes and remove balls from the urn...

• Replies: 5
• Views: 4,627
04-29-2011, 10:18 AM

A coin is tossed n times, where n is an odd number. Let X be the number of times heads show up in the n tosses. Define Y in terms of X as follows: if...

• Replies: 5
• Views: 2,658
BGM
05-09-2011, 11:55 AM
45. ### Conditional covariance

X_i\sim Ber(\frac{1}{4}) and Y_i\sim Ber(\frac{3}{4}). Find Cov(\sum_{i=1}^{N} X_i,\sum_{i=1}^{N} Y_i) where P(N=k)=\frac{1}{2^k} for k=1,2,3,.... ...

• Replies: 5
• Views: 8,142
05-15-2011, 10:09 AM
46. ### Probably of success for 3 mutually exclusive events

I have been removed from the details of this since college over 20 years ago... Here is my question... For event A, probability of success is 30%...

• Replies: 5
• Views: 3,503
05-17-2011, 12:56 PM
47. ### hi

Let (X_n)_{n \geq 1} be a sequence of random variables such that E(X_n)>0 for all n. Is it straightforward for one to say that the series \sum_{n...

• Replies: 5
• Views: 2,515
05-21-2011, 04:59 AM
48. ### Weighted coin probability

The problem: A coin is weighted to show heads 60% of the time. How many coin tosses are needed to have 90% confidence of getting more heads than...

• Replies: 5
• Views: 5,422
BGM
06-06-2011, 03:18 PM
49. ### Tricky Poisson Formula Rearrangement

Hello, I am currently doing some bus stop designs. I have not done statistics for a while but remember once doing poisson distributions at Uni. ...

• Replies: 5
• Views: 3,801
BGM
06-10-2011, 12:44 PM
50. ### Stuck on this

The probability of an event happening is 20%. How many times would you have to do this to get an 80% chance of it happening at least 3 times?

• Replies: 5
• Views: 2,262
06-26-2011, 09:03 PM
51. ### A large and powerful corporation is extorting money from the public.

When confronted with ****ing evidence the corporate CEO says these were rogue employees, these were anomalous cases, etc., etc., etc.. . . . ...

• Replies: 5
• Views: 2,403
08-07-2011, 09:47 AM
52. ### Markov Chain

A Markov chain X_{n},n\geq 0 with states 0, 1, 2 has the transition probability matrix If P(X_{0}=0)=P(X_{0}=1)=\frac{1}{4}, find E How do...

• Replies: 5
• Views: 3,845
08-09-2011, 12:58 AM
53. ### Same player winning the jackpot twice

Hi Here in Sweden a scratch card buyer managed to buy two scratch cards with the top prize. The top prize is very rare so this caused some...

• Replies: 5
• Views: 2,973
08-31-2011, 11:18 AM
54. ### Assessing goodness of fit across many variables in R in one session.

Hi all I'm just getting started in R and would like some help with the following problem which could make life easier I hope! I have data set...

• Replies: 5
• Views: 1,946
09-06-2011, 05:54 PM
55. ### Need some help with basic probability!

Hey, I need some help with two probability question, and I would really appriciate all the help I can get! QUESTION 1: (a) A quality inspector...

• Replies: 5
• Views: 4,715
09-16-2011, 03:43 AM
56. ### Gambling system significance

I have a gambling system that I've been using on NFL games since November of 2009. So far there have been 128 plays and the record is 80 wins and 48...

• Replies: 5
• Views: 3,740
09-14-2011, 03:42 PM
57. ### Probability problem

Find the conditional probalilities of the indicated events when two fair dice (one red and one green) are rolled: The sum is 6, given that the...

• Replies: 5
• Views: 6,619
10-02-2011, 05:12 PM

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