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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: 30,253
09-30-2005, 09:44 AM
1. ### Word problem needs double checking.

There are 10 seniors, 8 juniors, 5 sophomores and 3 frshman on student council. A committee of 6 members is formed. a.p(all seniors) b.p(3...

• Replies: 2
• Views: 1,473
05-10-2013, 02:16 PM
2. ### Determining the probability that two data sources are the same

I've been looking for the answer to this problem for a while now and I think a large part of it is that I don't know how to frame the question. Here...

• Replies: 5
• Views: 2,009
05-10-2013, 03:50 AM
3. ### Question Paper Probability

Hi all, I'm new to this forum and hope you guys will be able to assist with a basic probability question I can't seem to figure out. My...

• Replies: 3
• Views: 1,504
BGM
05-08-2013, 10:40 AM
4. ### What is the probability of ones at least one ancestor has prostituted?

Given the oldest profession is prostitution.

• Replies: 1
• Views: 1,999
05-08-2013, 07:47 AM
5. ### Are (sample) correlation matrices covariance matrices?

All my life I had been under the impression that the correlation matrix was a type of covariance matrix. They share similar features: they are...

• Replies: 2
• Views: 1,333
05-07-2013, 03:21 PM
6. ### Joint Distribution - Need some guidance

I have a problem that I am not sure how to solve, and would appreciate any guidance, help, or direction... The problem states: Suppose the...

• Replies: 3
• Views: 2,834
BGM
05-05-2013, 11:33 PM
7. ### Probability that values from different normal distributions will be in a given order?

I am looking at several normal distributions that describe the same metric for different populations (independent). I want to find the probability...

• Replies: 1
• Views: 2,247
BGM
05-05-2013, 12:07 PM
8. ### Calculate the Expected value,Variance,density and 2nd moment

I have to solve this exercise. Here are also my solutions but I don't know if they're correct. Let Ω ⊆ R ^ 2 a finite set of points in R ^ 2....

• Replies: 3
• Views: 1,569
BGM
05-04-2013, 08:04 AM
9. ### Integration of factorial?

If I want to figure out the constant, c, for the following joint probability mass function: { c(2^(x+y))/(x!)(y!) for x is an element of...

• Replies: 2
• Views: 3,826
05-03-2013, 11:15 PM
10. ### 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: 9,232
05-03-2013, 01:27 PM
11. ### Use a tree diagram to calculate the probability

Hi everybody! I have to solve this exercise. We observe a tournament of 2 ^ n players, which consists of n rounds. In each round every 2 players...

• Replies: 0
• Views: 2,076
05-03-2013, 09:41 AM
12. ### Central Limit Thrm / Chebyshev Problem

Suppose the price of a particular stock changes from day to day according to the following model. If Yn is the price of the stock on day n, then Yn =...

• Replies: 3
• Views: 2,340
BGM
05-03-2013, 01:21 AM
13. ### Dice Problem

Hi there, There's a the problem I've been trying to solve for the past two days. I have 5 dice, each with a different number of sides. Dice A:...

• Replies: 2
• Views: 1,970
05-02-2013, 05:46 PM
14. ### Sequence probability, need a cross-check

This is not a homework problem so, I don't have a grader or a TA to assist. Short problem: In a randomly generated 5 digit number (including...

• Replies: 5
• Views: 1,757
05-02-2013, 01:34 PM
15. ### Little help please with probability

A study indicates that 80% of college students having cell phones send and receive text messages with their phones. A) A sample of these students of...

• Replies: 1
• Views: 2,076
BGM
05-02-2013, 12:38 AM
16. ### Probability, Markov chain

A teacher leaves out a box of N stickers for children to take home as treats. Children form a queue and look at the box one by one. When a child...

• Replies: 1
• Views: 1,728
BGM
05-01-2013, 10:40 PM
17. ### Density of a random variable

Professor Roberto has to take an oral examination. The grading scale is as follows: 5: = best and 1: = worst. At most he only gives the note 4. Each...

• Replies: 2
• Views: 1,670
04-30-2013, 09:22 AM
18. ### Can anyone help me with this exercise?

Hi! I have to do this exercise: Define a finite probabilistic Space (Ω; Pr) and 2 events A,B⊆ Ω and Pr ≠ Pr so that we can verify that ...

• Replies: 1
• Views: 1,902
BGM
04-30-2013, 09:10 AM
19. ### Can anyone explain me the solution of this exercise please?

Hi i've found this exercise but I do not understand the solution: _________________________________________________________________ In a party c...

• Replies: 2
• Views: 1,565
04-30-2013, 05:52 AM

I'm having problems mostly with part (b) and (c). Please add every single step and side note you can - including formulas used. I greatly appreciate...

• Replies: 6
• Views: 2,866
04-28-2013, 02:30 PM
21. ### stochastic birth-death processes: electronic resources

I am interested in stochastic birth-death processes at about the level of Karlin and Taylor's 1975 text. My eyes are bad so I have a hard time...

• Replies: 0
• Views: 1,603
04-26-2013, 03:42 PM
22. ### Probability exam questions with worked-out solutions

Students can download from http://personal.vu.nl/h.c.tijms/ExamQuestionsUP.pdf a collection of more than 150 probability exam questions with fully...

• Replies: 0
• Views: 5,756
04-26-2013, 03:53 AM
23. ### Random Walk, Programming it.

Hi, I've recently became interested in learning about stochastic processes so after a bit of light reading, i decided to put this into action. I...

• Replies: 4
• Views: 5,111
04-25-2013, 03:50 PM
24. ### (What may be) A beginner problem!

Just as a disclaimer, I have never taken a probability or stats course, so please excuse me for not being up to snuff around here. Anyhow, for my CS...

• Replies: 0
• Views: 1,493
04-25-2013, 11:08 AM
25. ### Probaility Solution.

A quiz consists of 20 true-false questions. The score for each question is 1 point if it is answered correctly, and 0 otherwise. 1) Suppose a...

• Replies: 1
• Views: 2,131
04-25-2013, 06:09 AM
26. ### Renewal Process

Use the Laplace transform approach to find the renewal function for a renewal process with interrenewal p.d.f. as follows: g(x) = (c^2)xe^(-cx) ,...

• Replies: 1
• Views: 1,940
BGM
04-25-2013, 04:00 AM
27. ### Probability: 10 true/false questions, probability at least 7 are correct

An instructor gives a quiz involving 10 true-questions. To test the hypothesis that he student is guessing, the following rule is adopted: a) If 7...

• Replies: 1
• Views: 2,937
04-25-2013, 02:07 AM
28. ### Continuity Correction Questions

I understand the concept of continuity corrections for normal approximations, but I do not understand how to apply them. Most sites state that you...

• Replies: 0
• Views: 2,290
04-24-2013, 11:04 PM
29. ### Expected searches calculation for finding a discrepancy

Say you have an urn containing two different coloured balls. If the task is to keep blindly selecting balls without replacement until a 'target'...

• Replies: 1
• Views: 1,797
BGM
04-23-2013, 12:41 AM
30. ### Hypergeometric and Binomial Distributions

Hi all, I am getting a bit confused with these two questions: 1. 20% of widgets are faulty previously. You receive a lot of 20 widgets. You...

• Replies: 1
• Views: 2,632
04-21-2013, 02:32 PM
31. ### Combining properties of expected values and variances

Hi! First post here so cut me a bit of slack Hopefully an easy topic too (I'm new to stats). If I have some values for E(X) (e.g. 5min) and...

• Replies: 1
• Views: 1,809
04-21-2013, 02:13 PM
32. ### Stochastic Processes - Probability of r heads in a row before s tails in a row?

A biased coin is tossed repeatedly, with p the probability of heads on any single toss. Find the probability that there is a run of r heads in a row...

• Replies: 2
• Views: 2,728
04-17-2013, 07:57 PM
33. ### 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: 9,494
04-15-2013, 08:12 AM

In a game you have three chances to hit a ball. On each try you'll either score a hit, H, or a miss, M. After each try you have to alternate hands...

• Replies: 1
• Views: 2,400
04-14-2013, 10:20 AM
35. ### help!

Suppose a population has a mean of 90 and a standard deviation of 28. If a random sample of size 49 is drawn from the population, the probability of...

• Replies: 2
• Views: 2,148
04-11-2013, 04:02 PM
36. ### when (if ever) is Var(X) + Var(Y) > 2Cov(X,Y)

Hello to everyone. I have been asked to show when the following inequality holds and, if it never does, to also explain it. I am working under the...

• Replies: 3
• Views: 1,677
04-09-2013, 07:04 PM
37. ### Correlation coeficient(X,rank(X))

Given a sample of size N from a standard normal, I'd like to compute the correlation coeficient(X,rank(X)). So I need the expected value fo X*F(X)......

• Replies: 3
• Views: 1,932
04-09-2013, 05:09 PM
38. ### NCAA seed problem

Hello I am working on my final project and am having a lot of difficulty because it is over NCAA stuff and I have never watched a basketball game in...

• Replies: 2
• Views: 1,699
04-07-2013, 04:15 PM
39. ### Random Stats Question - Need a Refresher

Hi there, I am a finance major that took some 500 level statistics classes at one point in time. Unfortunately my statistics knowledge has...

• Replies: 1
• Views: 2,405
04-07-2013, 09:10 AM
40. ### Difference between binary logistic regression analyses and multivariate regression

I am new to this forum, hope this is in the correct placce. Can someone explain the difference between these two?

• Replies: 1
• Views: 3,095
04-06-2013, 09:09 PM
41. ### Exercise, Poisson process

This is an exercise from the book, Introduction to Probability Models by Sheldon M. Ross. Problem: A scientific theory supposes that mistakes in...

• Replies: 0
• Views: 2,922
04-06-2013, 12:05 PM
42. ### Normal Distribution Problem

Hello everyone, I am stuck on some problems involving normal distribution. Any help would be GREATLY appreciated. Unfortunately, this is for an...

• Replies: 1
• Views: 5,537
04-05-2013, 03:20 PM
43. ### simple probability question

Hello, I have a simple probability question that I was hoping somebody could answer. If I know that the probability that a charging point is...

• Replies: 2
• Views: 1,849
04-04-2013, 01:33 PM
44. ### Help with permutations

A relay race has 4 runners who run different parts of the race. There are 16 students, 4 from each class level, on your track team. What is the...

• Replies: 2
• Views: 2,492
04-04-2013, 01:29 PM
45. ### Neyman-Pearson test

'In the Neyman-Pearson binary hypothesis testing case, demonstrate that, in addition to the optimum, there also exists the worst possible test whose...

• Replies: 0
• Views: 1,864
04-04-2013, 09:59 AM
46. ### Problem with calculate joint probability

Hello I have a problem with calculating joint probabilities in text mining. i have two paralel text like this for example Bonjour les bons amis ...

• Replies: 0
• Views: 1,284
04-02-2013, 11:49 AM
47. ### Fair bet question

This is the question: Your friend proposes the following game. She will roll a fair dice six times. If the number of different numbers that show...

• Replies: 2
• Views: 2,018
04-02-2013, 04:41 AM
48. ### martingale and markov chain question

I need help understanding a solution. http://www.stat.lsa.umich.edu/~ionides/620/hw/hw8sol.pdf On #5, I really dont understand the notation for...

• Replies: 1
• Views: 1,985
BGM
04-01-2013, 01:55 PM
49. ### Beginner help with unconscious statistician

I should really know this, but i get stuck at some differentiation. So X is a R.V. with p.d.f. f_x(x), and Y=aX+b. We want to find f_y(y). So i...

• Replies: 2
• Views: 1,845
03-30-2013, 04:41 PM
50. ### Can I Know The Difference and A Couple of Questions

Mean 266 Days STD=16 Days Question 1- What is the probability that a random sample of 20 pregnancies that has a mean gestation period of 260...

• Replies: 2
• Views: 1,738
PSG
03-30-2013, 12:00 AM

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