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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: 30,333
09-30-2005, 09:44 AM
1. ### independent and disjoint

If C and D be independent events which are disjoint. What can we said about their probabilities?? i know C, D are independent so P(C n D)=P(C)...

• Replies: 6
• Views: 10,055
11-29-2008, 02:10 PM
2. ### HELP! P with percentages...3 problems

:) 1. A researcher wishes to conduct a study of the color preferences of new car buyers. Suppose that 40% of this populatin prefers the color red....

• Replies: 2
• Views: 10,035
12-26-2009, 10:45 PM
3. ### 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: 10,018
09-02-2010, 10:21 PM
4. ### Probability different colored balls picked without replacement "at least one of each"

Hello everyone. I am a hobby programmer working on a cool new project. I've always loved probability and always wanted to write a program using it...

• Replies: 7
• Views: 10,004
02-19-2012, 07:38 AM
5. ### What is the chance to have a mutual friend with a random person ?

We have a social network say facebook. We know that it is composed by 500 milion of users. We know that each user have an average of 135 friend. ...

• Replies: 8
• Views: 9,987
09-02-2011, 06:35 PM
6. ### I need help please!!!

A mail order company receives an average of five orders per 500 solicitations. If it sends out 100 advertisements, find the probability of receiving...

• Replies: 4
• Views: 9,981
10-09-2005, 08:51 PM
7. ### Uniform Distribution/Probability Density Function

I'm experiencing a mental block with this concept. If anyone could help me out, I'd be most appreciative. I understand the formula for the...

• Replies: 3
• Views: 9,934
11-29-2005, 09:29 PM
8. ### Exponential Distribution

I am in a 400 level Probabilities/Stats class at my university and am stuck on a problem relating to exponential distribution. I will list the...

• Replies: 7
• Views: 9,920
10-26-2006, 07:53 PM

I don't understand how to solve this problem. Please help! Thanks in advance A common design requirement is that an item (such as an aircraft or...

• Replies: 3
• Views: 9,909
04-19-2009, 10:53 PM
10. ### Expectance and Variance of Mixed Distributions

Hi, How do I get the expectance and variance of mixed variables. I can't seem to get a good exampe on this.

• Replies: 1
• Views: 9,859
11-11-2006, 02:11 AM
11. ### p-value

Can anyone tell me what a p-value of .000 means in layman terms?

• Replies: 1
• Views: 9,818
11-06-2007, 08:25 PM
12. ### Discrete and Random Variables

I'm not sure how to setup this problem. It says: To perform certain type of blood analysis, lab technicians must perform two procedures. The...

• Replies: 1
• Views: 9,755
09-14-2009, 08:30 AM
13. ### Probability System, discrete dist.

here is the system we're dealing with here Component 1 is the key one while an identical backup component is 2 and is in an "off" state until...

• Replies: 28
• Views: 9,750
11-16-2010, 12:10 AM
14. ### Sum of Weighted Probability Distributions

If I sum independent random variables X + Y = Z, then the distribution f(z) will be given by the convolution of the probability distributions f(x)...

• Replies: 2
• Views: 9,720
05-14-2010, 10:38 AM
15. ### Why can't t/(1-t) be a moment generating function for a R.V?

Hi there, having a bit of trouble with this one: Explain/show why there can be no random variable for which Mx(t) (moment generating function) = t...

• Replies: 11
• Views: 9,670
BGM
09-15-2011, 03:08 AM
16. ### Probability question

Here is the problem: To get to work, a commuter must cross train tracks. The time the train arrives varies slightly from day to day , but the...

• Replies: 4
• Views: 9,635
12-15-2005, 11:13 AM
17. ### 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: 9,635
BGM
09-05-2010, 10:22 PM
18. ### How to calculate the number of samples?

Our company receives wires which are manufactured to our spec in lot sizes that range between 2000 to 20000 wires at a time. These wires should be...

• Replies: 4
• Views: 9,629
03-09-2010, 05:11 AM
19. ### Chi-Square distribution problem

So my professor started doing stuff with the chi-square distribution this week and I've been lost for almost the entire time. Consider a random...

• Replies: 7
• Views: 9,589
02-18-2012, 05:50 PM
20. ### Difference between likelihood and the posterior probability (bayesian statistics)

Hello everyone. I am having a little bit of trouble wrapping my head around the difference between the likelihood and the posterior probability in a...

• Replies: 4
• Views: 9,546
04-15-2013, 08:12 AM
21. ### Expected value and Standard deviation of 2 alternatives

Hi! I'm glad I found this great forum! I really hope to be of use myself and help answer some easier questions. In the meantime, could somebody...

• Replies: 1
• Views: 9,529
02-02-2010, 06:22 PM
22. ### 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: 9,506
04-09-2011, 10:51 PM
23. ### Poisson or Binomial

Hi, im trying to make sure i have the difference between when to use Binomial and Poisson distributions firmly understood. Regarding the following...

• Replies: 5
• Views: 9,495
05-03-2012, 08:19 AM
24. ### Probability of 20-question test, binomial?

20 true-false quiz to determine who has read a book. Shes wants to choose the passing grade such that the probability of passing a student who...

• Replies: 9
• Views: 9,485
10-14-2010, 12:28 AM
25. ### 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: 9,469
05-11-2011, 01:35 PM
26. ### The sign of COV( f(x,y) , g(x,y) )

I am a PhD student in Economics, I am reading a paper on statistics, and the author states the following proposition without proof. My question is is...

• Replies: 19
• Views: 9,356
11-02-2008, 03:56 PM
27. ### The Gamblers Fallacy and Regression to the Mean

Hi, so first time posting and all. I'm not a statistician by degree or trade (actually an engineer), so a little confused by something, and was...

• Replies: 5
• Views: 9,350
10-10-2013, 02:27 PM
28. ### Probability of an Event

There is probably a very simple answer to this, but please help a stats novice. I am trying to determine the probability of an event occurring in...

• Replies: 12
• Views: 9,330
02-03-2010, 09:00 PM
29. ### Uniform Probability

I'm having trouble with this problem, and help would be really appreciated! Suppose a random variable x is best described by a uniform probability...

• Replies: 2
• Views: 9,314
04-14-2010, 08:56 PM
30. ### The sample covariance matrix is ALWAYS nonsingular... Right?

Just checking... I mean, with the exception of some peculiar cases (e.g. one variable is a linear combination of other ones present), there is no...

• Replies: 8
• Views: 9,252
05-03-2013, 01:27 PM
31. ### 12-sided dice probability

How would you give a sample space of rolling a pair of 12-sided dice?

• Replies: 2
• Views: 9,233
10-20-2007, 06:53 PM
32. ### Binomial Distribution as N goes to Infinity

I know that the Central Limit Theorem says that all types of distributions go to normal distribution as N goes to infinity. However, is there some...

• Replies: 6
• Views: 9,194
07-15-2010, 07:36 PM
33. ### how to find joint probability distribution of 3 variables

I am stuck in a problem. we have a red balls, b blue balls and c white balls. We are choosing n balls without replacement. How to find joint...

• Replies: 2
• Views: 9,186
10-27-2006, 09:59 PM
34. ### Comparing Gaussian curves

Hi, I have two points A(30.333,100) and B(30.333151665,80) I need to draw Gaussian for each point separately and need to check their overlap...

• Replies: 7
• Views: 9,160
08-31-2011, 05:35 PM
35. ### Scrabble probability question?

I have a question for you probability and statistics experts out there. At the beginning of scrabble to determine who starts, each person (in this...

• Replies: 4
• Views: 9,147
12-21-2007, 04:22 PM

Hi everyone, My question is- If Y denotes a geometric random variable with probability of success p, then show that for a positive integer a,...

• Replies: 2
• Views: 9,107
03-29-2009, 12:49 AM
37. ### Dice Probability (Yahtzee Related)

hi, I am currently doing my Computer Science Dissertation and it it to create a program that can play Yahtzee. My planning involves lots of...

• Replies: 1
• Views: 9,106
10-16-2007, 02:28 PM
38. ### Finding probability of left and right handed people

Hello, I am lost on these problems: Assume that 13% of people are left-handed. If we select 10 people at random, answer the following questions: ...

• Replies: 11
• Views: 9,058
10-02-2012, 10:29 AM
39. ### finding p-value from chi square freedom

For example, estimated p-value from chi-square table with 1 d.f is 0.1 < p < 0.9. Can anyone tell me how we get this range? aka. can anyone help me...

• Replies: 1
• Views: 9,039
02-23-2010, 02:42 AM
40. ### Independent Events Occurring Simultaniously

This should be an easy one for you smart guys: Consider a double computer intruder detection system (IDS) with system A and system B. If there is...

• Replies: 6
• Views: 9,033
10-10-2008, 07:48 AM
41. ### Difficulty setting up double integrals for Joint Distributions

I'm struggling to set up the correct range when calculating probabilities of joint distributions....anyone have any recommended reading or sites that...

• Replies: 16
• Views: 9,031
09-30-2012, 03:24 AM
42. ### 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: 9,007
08-19-2010, 10:59 AM
43. ### Dependent normal distributions

I'm doing some stock market analysis for a personal project. If I have two stocks which generate returns which are normally distributed, what is...

• Replies: 4
• Views: 9,003
10-08-2010, 01:33 PM
44. ### Probability of a Sample Mean between two numbers

I am having troubles with a problem that requires me to find the probability of a sample mean between two numbers. I am given the mean and the SD,...

• Replies: 0
• Views: 8,993
01-25-2010, 09:46 PM
45. ### wishart distribution and correlation matrix???

hey there everyone! just a quick question.... you see how the sampling distribution of the covariance matrix follows a wishart distribution (for...

• Replies: 7
• Views: 8,980
Lep
09-16-2013, 03:01 AM
46. ### Standardized Normal Distribution and Exponential Probability Distribution

• Replies: 0
• Views: 8,977
01-23-2008, 11:32 PM
47. ### Finding the max and min P-value from an F-tets

There is a following task in my econometrics HW: 1) I have 25 values of the {X} random value. First I find the variation, then the estimation for...

• Replies: 7
• Views: 8,969
BGM
09-30-2011, 07:28 AM
48. ### problem where the teach doesnt teach

I am not 100% sure how to even start this. With the 2 variable I get lost Please any help Human visual inspection of solder joints on printed...

• Replies: 2
• Views: 8,928
09-10-2008, 06:53 PM
49. ### Need help with a problem with Indicator Random Variable

A building has 10 floors above the basement. 12 people get into an elevator at the basement, and each of the 12 chooses one of the 10 floors at...

• Replies: 3
• Views: 8,913
10-05-2010, 07:24 PM
50. ### Help!! Probability ?????????????

I have a problem and need some step to step computation and a bit of explanantion. Have deadine of tomorrow Here's the problem: Oil company...

• Replies: 9
• Views: 8,885
10-20-2005, 10:24 AM
51. ### Expected Value of the Difference

The heights of all male students in a university have mean 170 cm and standard deviation 10 cm. Two male students are randomly selected. What is...

• Replies: 3
• Views: 8,874
10-20-2010, 03:31 PM
52. ### Distribution of sample mean using MGF

I'm not sure if I posted this in the right place, correct me if I'm wrong. I have been trying to solve this question for awhile now: Let...

• Replies: 4
• Views: 8,858
04-02-2011, 08:27 PM
53. ### Probability and Stat help

I'm having trouble with my homework, can anyone figure out these problems for me? In a certain community, 35% of the families own a dog, and 20%...

• Replies: 2
• Views: 8,824
06-16-2008, 09:13 PM
54. ### Explain Terms...

Am I correct? Q: A study compares two groups of mothers with young children who were on welfare two years ago. One group attended a voluntary...

• Replies: 1
• Views: 8,799
11-14-2005, 09:51 AM
55. ### Third Moment about the mean

Let E=μ4 S=/σ^3, where E(X-μ)^3=E(X^3)-3+2^3 How can I rewrite the right hand side of the above expression in terms of μ, σ^2, S and μ4. ...

• Replies: 11
• Views: 8,758
BGM
10-17-2011, 12:06 AM
56. ### variance for 2 random variables

Studying for an intro course test and I have no one to compare it to right now.. any help would be appreciated. Here is the question. Q....

• Replies: 3
• Views: 8,748
02-16-2009, 09:52 PM
57. ### 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: 8,732
BGM
08-19-2010, 02:11 PM
58. ### chess probability question

Hello, This question is taken from Ross' a first course in probability chapter 2. It is question 17. Here it is: If 8 rooks are randomly...

• Replies: 4
• Views: 8,707
05-06-2008, 12:28 PM

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