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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: 30,309
09-30-2005, 09:44 AM
1. ### 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: 8,193
05-15-2011, 10:09 AM
2. ### Card guessing problem

I took statistics & probability in college, but, for some reason, I seem to have a mental block on how certain things work. I never know which...

• Replies: 4
• Views: 3,502
05-15-2011, 04:26 AM
3. ### How can estimated mean of a variable be obtained by combining mean values of...?

Hi everyone, I am new to the forum. This is my question: Let say that I have following random variables: X: number of boxes (discrete...

• Replies: 2
• Views: 3,715
05-14-2011, 10:13 PM
4. ### finding MLE

f(x,y)=\frac{\theta}{4}, if (x,y)=(0,0),(1,1) =\frac{2-\theta}{4}, if (x,y)=(0,1),(1,0) Find MLE of \theta where 0\leq\theta\leq 2

• Replies: 8
• Views: 4,379
05-13-2011, 08:05 AM
5. ### Probability: Sums and Products of Random Variables

Suppose that X is uniformly distributed on (0,2), Y is uniformly distributed on (0,3), and X and Y are independent. Determine the distribution...

• Replies: 1
• Views: 5,770
05-11-2011, 09:53 PM
6. ### Marginal distribution over components of a normal-Wishart distribution

Hey, I have a Gaussian-Wishart distribution (with hyperparameters {m, B, W, v}) over the mean and precision matrix of a bivariate Gaussian...

• Replies: 2
• Views: 9,457
05-11-2011, 01:35 PM
7. ### linear combination of exponential distributions

I have an equation with linear combination of exponential distributions, i.e. sum (c_i * exp(a_i)) on the right hand side, and on the left hand...

• Replies: 2
• Views: 8,245
05-10-2011, 06:09 PM
8. ### A box contains 5 tickets

A box contains fives tickets, each with a letter on it: Box : S T A R T Once a day, for n days, a ticket will be drawn at random, with...

• Replies: 1
• Views: 2,981
BGM
05-10-2011, 04:35 AM
9. ### Expected Value of (1/N)

Someone rolls a pair of dice repeatedly until the first time a sum of eleven shows. Let N be the number of rolls required. Find E(1/N). So N is a...

• Replies: 2
• Views: 5,512
BGM
05-10-2011, 04:26 AM
10. ### Confidence interval?

I am trying to create intervals in my data such that each interval contains the same number of samples within its bounds. I created a histogram...

• Replies: 3
• Views: 3,919
05-09-2011, 08:49 PM
11. ### Probability Help Please!

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: 2,692
BGM
05-09-2011, 11:55 AM
12. ### Probability and Statistics

I am currently having trouble with one of my probability and statistics assignment questions and I'm hoping someone can help me. I can't seem to get...

• Replies: 1
• Views: 2,367
05-08-2011, 11:52 PM
13. ### Discrete random variable joint distribution

Hi, I have a pretty basic question about problems involving discrete random variable joint distribution. I'm give an joint distribution table with...

• Replies: 3
• Views: 3,801
BGM
05-08-2011, 11:52 AM
14. ### Probabilty question with two normal distributed variables

Hi there! I need some hints on this question: Assume , the actual voltages of a sample of 6-volt batteries, are independent randomly...

• Replies: 2
• Views: 1,793
05-08-2011, 11:43 AM
15. ### Comparing probability distributions over discrete random variables

Hi guys Sorry if the post is not in the right place but I am new here. I am comparing the performance of two monte carlo methods. The results I...

• Replies: 0
• Views: 2,992
05-08-2011, 07:38 AM
16. ### Problem about probability: how can I fix it?

Hello everyone! I should resolve this problem and I wonder if someone could help me understand everything that I consider to be able to solve it...

• Replies: 1
• Views: 1,910
05-07-2011, 11:09 AM
17. ### reliabilty calculation using poission distribution..urgent help plz

Hi, can someone please help me out with the follwoing problem i've been really struggling with it. I would greatly appreciate if you can. The...

• Replies: 3
• Views: 3,144
BGM
05-07-2011, 09:07 AM
18. ### Need some help thinking ...

As funny as that sounds, it's actually been a while since my stat classes. This actually isn't a homework question, I'm just trying to analyse some...

• Replies: 0
• Views: 1,369
05-06-2011, 01:53 PM
19. ### Probability - transformation of random variable

In an analog to digital conversion an analog waveform is sampled, quantized and coded. A quantized function is a function that assigns to each sample...

• Replies: 7
• Views: 4,128
05-05-2011, 11:02 AM
20. ### Monty Hall parameters

Nevermind, figured it out.

• Replies: 1
• Views: 1,814
05-04-2011, 08:42 PM
21. ### Sampling distribution of standard deviation

Hi, I need some help, please. If X_i~N(mu, s^2), what is the distribution of sample standard deviation , I mean, with n-1 degree of freedom? ...

• Replies: 3
• Views: 5,710
05-04-2011, 02:58 PM
22. ### Epidemic processes please have a look

Hello everyone I just would like anyone has knowledge about this topic to help me I have got the answer however , I do not understand it it...

• Replies: 0
• Views: 1,895
05-04-2011, 09:23 AM
23. ### Basic Probability Problem...

A container has 20 green & 30 red balls. Five balls are randomly drawn with replacement. Let x be the number of green balls drawn. Find the...

• Replies: 2
• Views: 2,004
05-03-2011, 07:05 AM
24. ### Solving probability questions (proofs)

Hi all, I'm sometimes not sure whether I should answer a true/false probability question by using the axioms/formulae, or if I should give a...

• Replies: 1
• Views: 5,030
BGM
05-02-2011, 11:28 AM
25. ### Question Probability Marbles!!

There are 5 red marbles and 195 blue marbles. Marbles are drawn randomly with replacement. What is the smallest number of draws, (d) for which...

• Replies: 4
• Views: 2,782
04-29-2011, 03:17 PM
26. ### 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: 4,652
04-29-2011, 10:18 AM
27. ### Poisson and Geometric Random Variable questions

Hi all, Can anyone tell me if I got the correct answers for the below two questions? Any help is appreciated. Q:Let X have a Poisson...

• Replies: 6
• Views: 5,408
04-28-2011, 10:29 PM
28. ### building a mailing response model

was hoping someone had any ideas on building a model on the following. let's say we have monthly mailings plus a holdout cell over a period of 12...

• Replies: 0
• Views: 1,673
04-26-2011, 12:17 PM
29. ### "Bridging" uniform and "mass" distributions

My goal is to find a family X(a, b) of random variables (continuously) depending on two non-negative parameters a and b . The family should have the...

• Replies: 2
• Views: 2,168
04-26-2011, 11:22 AM
30. ### homework HELP! STUCK!

I have no idea where to even begin. I've missed a lot of class, and have an exam. This is the sample problem. Any help would be great!

• Replies: 0
• Views: 2,278
04-25-2011, 09:04 PM
31. ### continuous random variables two variables help.

I need to know how to find two values that add up to 90% using only the standard deviation and the mean. please dont tell me something like ...

• Replies: 1
• Views: 1,893
04-25-2011, 12:46 AM
32. ### continuous random variables help

continuous random variables: basically, if you guys can answer this question for me and explain how its done I should be able to do the rest of...

• Replies: 1
• Views: 2,210
04-24-2011, 04:47 AM
33. ### Homicide Help!

I'm building a program that is supposed to aid in homicide investigations by giving a possible profile of a killer, but I'm having trouble with the...

• Replies: 0
• Views: 2,671
04-23-2011, 05:19 PM
34. ### Probability problem (independence)

Hi all, I am struggling with this exercise. We have three events A, B, C. A is independent of B, and C is a subset of A. I want to check if also...

• Replies: 1
• Views: 1,751
BGM
04-23-2011, 01:39 PM
35. ### Finding posterior probability from natural frequencies

I've repeatedly been trying to solve a problem (exercise 4.5) in John Kruschke's Doing Bayesian Analysis and I just can't work out how to get the...

• Replies: 2
• Views: 2,399
04-23-2011, 12:48 PM
36. ### Show that Expectation does not exist ?

I've been stuck on this question for a few hours and would appreciate any help. Q. X is a random variable with mass function Px(x) =...

• Replies: 2
• Views: 8,522
BGM
04-20-2011, 11:38 PM
37. ### Joint Probabilities for Dependent Mixed Plans

Hi Folks, Table T13.8 Joint Probabilities for Mixed Plans p612 Acceptance Sampling in Quality Control (2e) Seems to contain erroneous...

• Replies: 0
• Views: 1,541
04-20-2011, 01:12 PM
38. ### Normal Random Variables, Central limit theorem

It is desired to estimate the mean compresive strength of a particular formulation of concrete. Samples are taken and their compressive strength...

• Replies: 1
• Views: 1,880
BGM
04-19-2011, 10:18 AM
39. ### Erf & Solving for x in the Normal Distribution cdf

The cdf formula for Normal Distribution is: f(x) = 1/2 If mu = 0 and sigma = 200 x square root of 2 then f(x) = 1/2 Since f(x) is a...

• Replies: 3
• Views: 7,110
04-18-2011, 07:07 AM
40. ### cross corealtion matrix

Hi can any body help that how can we calculate a cross correlation matrix coeff in real time uzmeed

• Replies: 0
• Views: 2,333
04-18-2011, 05:45 AM
41. ### Random number generation - Use Bernoulli for tennis match series?

Q. The probability of A winning a game of tennis against B is 0.74 Simulate a best of 5 sets (first to win 3) between A and B. Use the following...

• Replies: 3
• Views: 4,514
BGM
04-18-2011, 03:34 AM
42. ### Modified rejection method for random number simulation

Q. The pdf of X is: f_X (x) = c(x^0.5)(1+x)^2.4 , 0≤x≤1 where c is an appropriate constant. Set up a procedure for generating a random...

• Replies: 1
• Views: 3,551
BGM
04-18-2011, 03:29 AM
43. ### Probability of a dependency

How does one calculate the probability that a given event will occur based on the current result and given a history of a sequence. For example,...

• Replies: 1
• Views: 2,556
BGM
04-17-2011, 02:00 AM
44. ### help with probability problem.

Hi there.. I have this one, can you help me out?? #1- a cheese seller gets a stock of cheese for 22000 usd, the prob that he can sell the whole...

• Replies: 1
• Views: 2,352
04-16-2011, 09:02 AM
45. ### 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: 8,106
04-15-2011, 05:23 PM
46. ### φ Distribution Table

Hi, I'm currently looking for the φ distribution table, to calcuate marginal effects in a probit model. Unfortunatly there isn't one in my...

• Replies: 0
• Views: 188,807
04-15-2011, 05:59 AM
47. ### Probability question, formula wanted

My question is example is, if there is a drink that has a 10% chance of making a person grow taller, and I have 50 of those drinks and I sample 50...

• Replies: 1
• Views: 3,568
04-15-2011, 12:06 AM
48. ### probability

I just posted another question and figured it out by myself but now i'm really stuck. Any suggestions to help me through it? Any input would be...

• Replies: 3
• Views: 23,498
04-14-2011, 06:19 AM
49. ### Exercise doubt

Hello everyone, I have to do an exercise or probability and i dont know or better if i say im not sure what to do? I know i have three types of...

• Replies: 0
• Views: 2,766
04-12-2011, 08:56 PM
50. ### Yet another "flipping" coin problem

Hi folks, So we flip two balanced coins. If at least one of them shows tails what is the probability that the other coin is also tails? My answer:...

• Replies: 4
• Views: 3,569
04-12-2011, 08:15 PM
51. ### 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: 19,921
BGM
04-11-2011, 01:53 PM
52. ### Homework problem

Hi, Let's begin with apologize for my English, but I'm native of polish. So my problem, I was asked to figure out after what time of formal...

• Replies: 1
• Views: 4,021
04-09-2011, 11:47 PM
53. ### Normal/Logistic Distribution: Sigma vs. S

For Normal Distribution, we have the variables x, mean and sigma (standard deviation) For Logistic Distribution, we have the variables x, mean and...

• Replies: 1
• Views: 9,495
04-09-2011, 10:51 PM
54. ### type 2 error probability

Hi, I need help calculating the type 2 error probablity A Harris poll was taken to determine which of 13 major industries are doing a good job...

• Replies: 0
• Views: 5,526
04-08-2011, 01:49 AM
55. ### random variables problem

Hello i have a few questions in probability i can't make heads or tails of. hints or answer much appreciated for question 1 assume E=E*E...

• Replies: 2
• Views: 2,516
04-07-2011, 08:16 PM
56. ### continuous distributions

hey.. im struck here f(x,y)=8xy 0<y<x<1 so now how do i take the limits to integrate when i have to calculate E(XY)?

• Replies: 4
• Views: 2,864
04-07-2011, 12:15 PM

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