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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: 30,213
09-30-2005, 09:44 AM
1. ### Name for the expression E(Y|X)*Prob(X)

I am working with a term which is an expectation conditional on an event, multiplied by the probability of the event occuring. For example,...

• Replies: 5
• Views: 2,211
09-12-2012, 07:56 PM
2. ### Question Involving Both a Die and Coin

Hi, I am having difficulties with this probability question and would love some feedback to see if I am thinking this through correctly: “A die...

• Replies: 11
• Views: 2,609
09-12-2012, 08:41 AM
3. ### Question about a monte carlo simulation of car travel patterns

Hi there, I have a question about probability, conditional expectations, copula functions and their use in a Monte carlo simulation. I'd...

• Replies: 0
• Views: 1,217
09-12-2012, 08:13 AM
4. ### Selection probability + time variable?

Greetings statisticians, I seek advice regarding a probability of selection. Here is the scenario: I, living in the US, have a music collection...

• Replies: 0
• Views: 1,650
09-11-2012, 08:29 PM
5. ### Stuck on Algebraic Proof

Hi, I am trying to algebraically prove the following statement: (n-k+1) ((n) c (k-1)) = k ((n) c (k)). The following are the steps I have down on...

• Replies: 11
• Views: 2,685
09-10-2012, 07:00 PM
6. ### "either but not both" ??

Hi, I was trying to complete this question, but I'm confused about where either but not both comes in: "certain chickens on a large farm have...

• Replies: 2
• Views: 4,011
rlm
09-10-2012, 04:43 PM
7. ### Uncorrelatedness implies independent ?

Hi, my question is how to derive the following statement: Give two random variables, X and Y, if E(h(X)g(Y)) = E(h(X))E(g(Y)) for all...

• Replies: 1
• Views: 946
09-09-2012, 03:28 AM
8. ### finding pmf and cdf of a random variable sequence

Question: Consider the i.i.d. sequence X1, X2, …X6 where each Xi is one of the four symbols (a,t,g,c). Further suppose that P(X1=a)=0.1,...

• Replies: 1
• Views: 2,865
09-08-2012, 09:12 PM
9. ### conditional probability and size of population question.

deleted post. no responses.

• Replies: 1
• Views: 1,389
09-08-2012, 05:47 PM
10. ### Oreos

This should be simple but my 4 other people got a different answer than me. You have a bag with 6 oreos. 4 are vanilla, and 2 are chocolate. You...

• Replies: 3
• Views: 1,479
BGM
09-06-2012, 03:49 AM
11. ### Sampling Probability Question

Hi Folks. i have a probability question. Actually, it's more of a sampling question. I have a population that contains 6 different conditions. ...

• Replies: 8
• Views: 1,700
09-05-2012, 06:05 AM
12. ### question on two uniform variables.

Let X~Uniform(0,10), Y~Uniform(0,10). If E = 2, what is E[|X-5|?

• Replies: 2
• Views: 1,800
BGM
09-04-2012, 04:44 PM
13. ### Help Needed In Solving For Mean of Normal of CDF

(My stats are a bit rusty so please forgive my clumsy notation and terminology.) Okay so given values for A,B and a probability p: p*F(A;mu,1)...

• Replies: 5
• Views: 1,929
09-04-2012, 01:01 PM
14. ### Battleships Game

Guys, I am struggling to understand how the probability of the Battleships game works. Clearly the variables are a) the area of the grid b) the area...

• Replies: 1
• Views: 1,181
09-02-2012, 10:14 AM
15. ### Kelly formula for two options (one with 0 risk)

Kelly says you should invest x% of your bankroll in a gamble (either lose everything or gain a multiple E from a win with probability p): x =...

• Replies: 1
• Views: 1,525
BGM
08-31-2012, 02:36 AM
16. ### Confidence Question?

I have a question related, I think, to "confidence". The problem I have is when people jump to conclusions based on what appears to be a...

• Replies: 4
• Views: 1,563
08-30-2012, 09:12 AM
17. ### Area under PDF for Normal, beta, gamma, and weibull distribution

Dear Stata user/Professional! I have a problem of integral function estimation for the Normal, Beta, Gamma, and Weibull density function in stata. ...

• Replies: 0
• Views: 3,721
08-30-2012, 12:24 AM
18. ### classification of probability distributions

Hi, I wonder if there is a classification of probability distributions or so called 'controlled vocabulary' or 'ontology'? So far I could find...

• Replies: 0
• Views: 2,276
08-29-2012, 11:48 AM
19. ### Decomposition of bivariate normal density

Hello, I have a question regarding the bivariate normal density. I need to evaluate density p(x,y), where x is a n x 1 vector and y is n*3 x 1...

• Replies: 2
• Views: 1,199
08-28-2012, 12:28 PM
20. ### 725 Facebook Friends, 6 Birthdays

I logged into Facebook today to find that 6 of my 725 friends had their birthday today. This number seemed quite high to me. What are the odds of...

• Replies: 1
• Views: 1,259
08-27-2012, 03:46 PM
21. ### random walk without replacement probabalistic bounds

Hi, I am trying to prove a seemingly simple property of random walks created by selecting steps without replacement. I'm considering...

• Replies: 2
• Views: 3,123
08-27-2012, 07:56 AM

Hi folks, I have a probability calculation problem that is currently doing my head in and I wonder if someone can tell me where I've gone wrong...

• Replies: 6
• Views: 1,671
BGM
08-27-2012, 03:42 AM
23. ### Probability - stuck trying to use a different solution

The Conundrum Question? Two of the cylinders in an eight cylinder car are defective and need to be replaced. If two cylinders are selected at...

• Replies: 0
• Views: 3,024
08-27-2012, 12:18 AM
24. ### Help!!!

I HAVE THE ANSWER, I just need to know how I got there. (If that makes any sense) At a random moment between 6:30 and 7:30 a.m. the morning paper...

• Replies: 1
• Views: 949
08-26-2012, 07:13 PM
25. ### Probability Help

Two points are placed at random on (not in) a circle of diameter 1. The second point travels on the circle to the first point. Find the expected...

• Replies: 3
• Views: 1,847
08-26-2012, 06:28 PM
26. ### Probability

Hi everyone, how can i start this? i have a lot of 32k parts and I would like to calculate the probability of finding one bad part in this lot, how...

• Replies: 2
• Views: 1,627
08-25-2012, 04:36 PM
27. ### EM Algo Iterations

Dear all, Consider the EM algorithm. Does this algo has the property that the value of the objective function always decrease in an iteration...

• Replies: 0
• Views: 1,208
08-25-2012, 12:18 PM
28. ### Binomial Probability

problem solved :)

• Replies: 0
• Views: 1,396
08-24-2012, 11:39 PM
29. ### Game Theory Exercise! Help???

Consider the following guessing game. There are 100 participants, and each participant announces independently and simultaneously a number between 0...

• Replies: 3
• Views: 3,511
08-24-2012, 04:50 PM
30. ### ln probability

this question im lost and confused to whats it asking X is a positive continuous random variable with mean 20 and standard deviation 2. In the...

• Replies: 1
• Views: 1,840
08-24-2012, 08:46 AM
31. ### Probability Involving a Variation on Poker

Hey everyone, I've been experimenting with probability lately, and I've been creating various games for fun and analyzing the math behind them. On...

• Replies: 10
• Views: 1,938
08-24-2012, 12:49 AM
32. ### Mean of a Joint Random Variable

I am new to statistics, so bare with me please. I have the following question to answer. Suppose X and Y have joint density f(x, y) =...

• Replies: 4
• Views: 1,592
08-23-2012, 10:12 PM
33. ### bootstrap theory reference?

I am curious about bootstrap methods, and just read the very elementary explanation of them here:...

• Replies: 2
• Views: 1,566
08-23-2012, 08:02 PM
34. ### A probability question

I am trying to revise for a test, and am working through some prep questions. I am struggling on this one, could anyone help? Suppose there is a...

• Replies: 4
• Views: 1,202
08-22-2012, 08:53 PM
35. ### Var(X + XY + Y|X)

Hey everyone, The exercise is as follows: Let X ~ N(0,2) and Y ~ N(0,1) be two random variables with cov(X,Y) = 0.5. Let Z=X+X*Y+Y. I have to...

• Replies: 0
• Views: 1,678
08-22-2012, 01:09 PM
36. ### Probability of breakdown

I am considering using regression analysis to estimate the probability of breakdown of vehicles in a fleet. I have some evidence showing that...

• Replies: 0
• Views: 2,138
08-22-2012, 08:08 AM
37. ### Uniform Probability distribution question.

So the question is this: http://i.imgur.com/WRMCC.jpg So far, I have: http://imgur.com/ddUPj How do I do part (b)??

• Replies: 1
• Views: 1,538
BGM
08-21-2012, 03:36 PM
38. ### 818 Facebook Friends, 0 Birthdays

Hi all, first time poster here. I am an avid facebooker and like to wish people happy birthdays when they come up. Today, for the first time, I...

• Replies: 6
• Views: 2,021
08-21-2012, 02:09 PM
39. ### How many different combinations can a user make?

I would like to figure how many different ways a report can be filtered. The report shows how many different units were sold. Filter 1: Allows...

• Replies: 8
• Views: 4,019
08-20-2012, 08:55 PM
40. ### How to find the conditional density

Hi, I'm trying to solve the following exercise: Y = X² Find f(X|Y) in terms of f_X(x) I have been able to find the pdf of Y, f_Y, via the...

• Replies: 0
• Views: 1,324
08-20-2012, 05:26 PM
41. ### Determine if a worker differs from typical performance?

I'll start with some details about my specific situation. I've got a database that contains records of jobs, clients, and workers. My goal is to see...

• Replies: 3
• Views: 1,636
08-18-2012, 02:03 PM
42. ### lottery tickets, better to buy all for one game or play X number of games

Im wondering which would be better. Im assuming the following, chance of winning = 10,000 for a particular ticket. So if i bought 10 tickets, the...

• Replies: 0
• Views: 844
08-18-2012, 12:47 PM
43. ### Geometric Distribution question

probability of raining each day = p = 0.01 q = 0.99 What is the expected number of days until we see a rainy day? I think the answer is ...

• Replies: 3
• Views: 4,331
BGM
08-17-2012, 05:31 AM
44. ### Tough Problem

Well, for me anyway. :p A process undergoing tests has both electrical and mechanical parts. The tests show satisfactory operation 55% of the...

• Replies: 0
• Views: 1,071
08-17-2012, 02:14 AM
45. ### Card Drawing Help!

This is for a project I'm working on involving MtG. It began in a different form from an idea for a program I have, but this particular iteration is...

• Replies: 2
• Views: 1,309
08-16-2012, 01:48 PM
46. ### Probability problem

I'm teaching myself the basics of probability using an old book called "A programmed introduction to probability" by J.R.Dixon, published in 1964....

• Replies: 6
• Views: 1,919
08-16-2012, 06:22 AM
47. ### Probability or Non Probability sampling?

:wave: Good day guys. I have a problem on the sampling technique i used in my study. I have clustered the barangays of Tagum City into 2 urban and...

• Replies: 0
• Views: 1,608
08-15-2012, 08:55 PM
48. ### probabilities of combinations

Hi, I'm thinking if you can help me think of a better way to solve this. Here's the situation I have probabilities of the number of bags I...

• Replies: 3
• Views: 1,909
08-13-2012, 10:36 AM
49. ### Normal Distribution

Hi all, I need some urgent help with the below questions: 1. Sales of apples are normally distributed with a mean of 500,000 boxes per week and a...

• Replies: 2
• Views: 1,196
08-13-2012, 08:59 AM
50. ### Difficult probability question

I've gotten this off another forum (it hasn't been solved yet), and thought you guys might enjoy this problem. I don't need it solved as it's not my...

• Replies: 7
• Views: 1,887
08-09-2012, 10:20 AM
51. ### Goodness of fit

Can R^2 be use to test the goodness of fit for the probability distribution of univariate sample?

• Replies: 1
• Views: 1,423
08-09-2012, 08:30 AM
52. ### What's wrong with this sample space?

"A coin is tossed until for the first time the same result appears twice in succession. Describe the sample space." My answer: \Omega :=...

• Replies: 6
• Views: 2,403
08-07-2012, 01:08 PM
53. ### Prediction & Autocorrelation

I have a set of dependent variables which are serially correlated. I understand the confidence and prediction intervals are actually much broader...

• Replies: 0
• Views: 1,623
08-07-2012, 11:18 AM
54. ### Need help here on probabilities

Hi, I'm trying to create a template in excel which will give me the probabilities of winning a tennis match. I've done some research already, and...

• Replies: 1
• Views: 1,431
08-06-2012, 08:31 AM
55. ### probability of winning 1st and second

Hi, I just want to know if what I have here makes any sense to you Here's the problem Suppose i have unknown number of balls in a jar with...

• Replies: 4
• Views: 1,583
08-06-2012, 01:08 AM
56. ### Probability with sampling question

i have been having problems with what should be a trivial probability problem Suppose there are 130 patients. Each patient was administered one of...

• Replies: 17
• Views: 4,433
08-06-2012, 12:18 AM
57. ### Probability of Independent Events

Hi, If hypothetical events A and B are independent, with P(B/A)=.4, and P(A)=.3 What is the P(B)? What formula would you use to figure this...

• Replies: 9
• Views: 2,382
08-05-2012, 12:39 PM
58. ### distribution total number of car accidents in a lifetime of the car

the number of car accidents every year has Poisson distribution with mean λ and lifetime of the car has exponential distribution with mean 1/μ. how...

• Replies: 1
• Views: 1,450
08-05-2012, 09:33 AM
59. ### Probability Theory Query - Which one?

I was wondering if an anyone suggest a possible probability theory for a piece of work I'm doing. Essentially I have a sequence of values (all...

• Replies: 6
• Views: 1,591
08-04-2012, 08:10 PM

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