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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: 31,129
09-30-2005, 09:44 AM
1. ### Stats problem

I was given a class problem, Suppose we are interested in computing P(A, D), but we can only measure P(A|B, C, D). Show how we can apply the...

• Replies: 2
• Views: 1,538
10-19-2015, 02:18 PM
2. ### Optimal Fantasy Sports Lineup

So say I have to create a lineup of 9 players and I have a database full of hundreds of players. Each one has a possible point distribution and a...

• Replies: 0
• Views: 1,063
10-17-2015, 11:20 AM
3. ### Conditional probability answer check

I just want to check my answer with you guys. A supermarket wants to know peoples shopping habits. 250 were surveyed. 60% was females. 70% of all...

• Replies: 1
• Views: 1,518
10-15-2015, 09:36 PM
4. ### Probability Distribution Exercises

Hi guys, I got some big problems in Statistics and have actually no clue about 3 exercises I have to solve. If anyone can help me (even if its...

• Replies: 3
• Views: 1,720
10-14-2015, 07:00 AM
5. ### Probability/C.I help

I am doing a midterm review and would very much like to know how to solve these questions 1. Millions of people now shop online. According to...

• Replies: 0
• Views: 1,218
10-13-2015, 04:20 PM
6. ### Need help with probability question

So here's my problem: a typical physician performs 4,000 procedures/services per year. These are made up of 75 unique procedures/services. If I...

• Replies: 3
• Views: 1,794
BGM
10-13-2015, 06:18 AM
7. ### Taylor series

This is probably really easy to see..... but I just can not get it right: // Set y = exp(x). Then x - log(1 + exp(x)) = log(y) - log(y + 1). //...

• Replies: 2
• Views: 1,609
10-12-2015, 03:49 PM
8. ### Prove: Birth-death chain has stationary distribution -> satisfy detail bal. equations

I'm working my way through a course in stochastic processes but came across this Lemma in my coursebook where they didn't show the working (Lemma...

• Replies: 1
• Views: 1,052
10-08-2015, 09:08 AM
9. ### Show the limit of a discrete markov chain's distribution converge to a continuous one

• Replies: 4
• Views: 2,812
10-05-2015, 02:51 PM
10. ### Counting methods

Hello, So I have a question that I thought I did right but in reality, was wrong. The question goes as followed: Suppose I give you a list of 20...

• Replies: 0
• Views: 3,488
ssx
10-04-2015, 08:20 PM
11. ### Odds of getting 1 decent prize out of X chances, Y decent prizes, and Z total prizes.

I am invited to play a game where there are 10 good prizes, 300 losers prizes, and I have 5 tokens to spend playing, 1 per turn. I know the odds...

• Replies: 3
• Views: 1,573
10-03-2015, 09:47 PM
12. ### Finding P(AnB') (Homework)

Hi there, this is my first post on this forum. I am trying to find the probability of P(BnA') the data given is: P(A) = 1/3 P(B) = 1/3...

• Replies: 1
• Views: 1,821
BGM
10-03-2015, 09:54 AM
13. ### Am I thinking of this the right way?

Hi, I'm not sure if I'm thinking of the right way to do this problem: Bacterial cells are often classified by their shapes, the three most common...

• Replies: 3
• Views: 2,930
09-30-2015, 01:02 PM
14. ### Covariance of unconditional density

I do have a minor problem with a simple covariance matrix. Let x be a first order Markov chain of length n defined by the transition matrix P,...

• Replies: 0
• Views: 1,172
09-29-2015, 04:39 AM
15. ### Calculating probability of the expected number of runs needed

Hello, I'm working on a personal project but I've hit a bit of a wall in working out an equation. I'd like to find the probability of a result given...

• Replies: 6
• Views: 1,965
09-28-2015, 02:25 PM
16. ### Can probability limit be used as mean for asymptotic distribution?

Hi there, I was wondering the following. If I have found that a variable X converges to some probability limit p and subsequently I wish to find...

• Replies: 1
• Views: 1,824
BGM
09-27-2015, 12:59 PM
17. ### Calculating the Probability of a Subset

I'm a newbie and not a stats savvy so help and guidance is appreciated. If I use incorrect terms please forgive and correct. The data set...

• Replies: 7
• Views: 1,957
09-27-2015, 01:38 AM
18. ### Probability function based on X ~ Exp(B)

I have a problem which im having difficulties to solve. We have a continuous variable X = time measured in hours until event A happens. X is...

• Replies: 7
• Views: 1,822
09-25-2015, 05:52 AM
19. ### Little homework help needed

Hi, I need help with the last question of a homework problem. I am given: P(A1) = 0.23, P(A2) = 0.26, P(A3) = 0.29, P(A1 ∩ A2) = 0.08, P(A1 ∩ A3)...

• Replies: 3
• Views: 2,431
09-24-2015, 06:48 PM
20. ### Probability for a Two-dimensional Discrete random variable

Hi all, I hope someone can help me a bit facing this problem. I have many item samples from a database (let's say 1000 for example) with two...

• Replies: 1
• Views: 1,358
BGM
09-24-2015, 11:08 AM
21. ### Two events meeting

Hello everyone, I have a question regarding two events that take place randomly over a certain time period and meet. A similar problem would be...

• Replies: 4
• Views: 900
09-23-2015, 12:36 PM
22. ### properties of strictly stationary martingale difference sequence

hey guys, I couldnt find a similar thread, so I decided to post my problem... Im in a time series setting: lets describe a sequence \epsilon_t,...

• Replies: 0
• Views: 1,586
09-22-2015, 10:07 AM
23. ### Determine distribution and parameters

I have a question but maybe it's the wrong question so I'll state the task first... I want to make data that looks like the data I'm working with...

• Replies: 5
• Views: 1,807
09-21-2015, 09:13 PM
24. ### Algebra with random variables

I've done something strange, potentially bad, and i just wanted to check how bad. So i have the p.d.f of waiting time as: ...

• Replies: 3
• Views: 1,626
09-16-2015, 08:40 AM
25. ### Correlation coefficient and Expected Value

Hi there, I'm doing an introductory statistics course and I'm having a little trouble with one of the questions. I am supposed to find out what...

• Replies: 0
• Views: 1,795
09-15-2015, 10:21 AM
26. ### Bayes' Rule with Random Variables

Hello! I'm having so much trouble trying to figure out how to do part (b) of the following problem: The probability that any child in a certain...

• Replies: 0
• Views: 3,649
09-14-2015, 04:53 PM
27. ### How to calculate how often a specific combination occurs in random design?

Hi everybody, I hope someone can help me out! We designed an experiment in which 24 short clips are shown to particpants. These clips belong to...

• Replies: 7
• Views: 2,861
09-11-2015, 10:56 AM
28. ### A bet between a buddy and I regarding the lottery

Hello all, My coworker is convinced that the Powerball lottery is rigged against those players purchasing more than one game (set of 6 randomly...

• Replies: 8
• Views: 1,997
09-08-2015, 11:23 AM
29. ### Probability of many coin flips coming up heads 65% etc.

Hello, I am wondering how to calculate what the probability would be of flipping a coin, say, 250 times and having it come up heads 65% of the time....

• Replies: 4
• Views: 2,074
09-07-2015, 02:32 PM
30. ### Homework help

Hi! I struggle really with statistics, probability theory and math in general, its really hard for me to understand and figure out by myself the...

• Replies: 2
• Views: 1,895
09-05-2015, 02:44 PM
31. ### Probability Density Function of the derivative of a stochastic process

Dear all; What is the expression of the PDF of the derivative of a stochastic process? My problem is completely general and theoretical, so, let's...

• Replies: 0
• Views: 1,663
08-31-2015, 06:45 AM
32. ### help plzzzz

A national grocer's magazine reports the typical shopper spends eight minutes in line waiting for checkout. A sample of 24 shoppers at the local...

• Replies: 0
• Views: 3,980
08-31-2015, 12:55 AM
33. ### Prior probability distribution for k [a;b]

Hi folks. I've a question. Let k be a parameter which must be estimated. It lies within the interval , a and b being finite real numbers. ...

• Replies: 1
• Views: 1,093
08-30-2015, 06:36 PM
34. ### Every one says I am wrong, how can I be wrong?

P(A)/x=(1/52)/t1 P(A)/y=σ²=0_1/t2 x=52 y=f(^x) t1=continuos time

• Replies: 1
• Views: 2,201
08-29-2015, 10:42 AM
35. ### Probability problem

A Committee consist of 8 men and 5 women. 1)in how many ways the group consisting of 4 members can be seleceted 2)in how many group will contain...

• Replies: 0
• Views: 1,804
08-28-2015, 03:18 AM
36. ### Newbie here, would appreciate some help.

Hey guys. First post here and it's a bit basic so sorry about that. I have created an analogy to the problem I have. Say I have 8 balls, 4 of...

• Replies: 5
• Views: 2,478
08-27-2015, 02:15 PM
37. ### Raw moments of 3-parameter Weibull distribution

Hi, I know that the formula for computing the raw moments of 2-parameter Weibull distribution is: Mu'n=b^n*Gamma(1+n/c), where b and c are scale...

• Replies: 2
• Views: 1,368
08-26-2015, 12:37 AM
38. ### Help Settle and Argument re: Chance of Failure in Fantasy Football

Hi, all! I'm new, so please accept my apologies in advance for... whatever. So here's the question. In a fantasy football league, there are...

• Replies: 11
• Views: 1,812
08-25-2015, 12:16 PM
39. ### Probability of goals in a football match?

I am trying to work out the probability of teams scoring a goal in a football match. Obviously there are many factors to consider, and the...

• Replies: 6
• Views: 2,838
08-24-2015, 12:59 PM
40. ### Probability & Network Theory

Hey Everyone, new to this forum and studying network/graph theory on my own. Math has never been my strong point, and I need help with how the...

• Replies: 3
• Views: 1,379
08-22-2015, 07:06 PM
41. ### probability of observation

“In a hospital, births occur randomly at an average rate of 2 births per hour. Calculate the probability of observing 1. 3 births in a given...

• Replies: 2
• Views: 3,315
08-20-2015, 09:38 AM
42. ### formula for False Alarm Rate and Power of Detection based on Median Run Length

Hi, What is the formula for False Alarm Rate and Power of Detection based on Median Run Length?

• Replies: 0
• Views: 1,250
Fam
08-18-2015, 03:53 AM
43. ### Contribution to a Probability

Hi All, I'm sorry that this question is trivial but I'm afraid I've forgotten how to solve simple probability and statistics problem :( Say...

• Replies: 0
• Views: 1,689
edp
08-18-2015, 12:46 AM
44. ### Weibull/Normal Distribution Hazard Rate Calculation

Hi, so I've been searching the web a while for a real example or procedure to get hazard rates from actual data but all I can come up with are...

• Replies: 0
• Views: 1,778
08-13-2015, 03:27 PM
45. ### Pagano solution chap 6

Does anyone have pagano solution book. I just want to know the answers of chap 6 excercise 9 and 15. a b, c d answers. Thanks.

• Replies: 0
• Views: 1,709
08-13-2015, 12:44 AM
46. ### Help in solving a question

Hello everyone, I am working on some exercise questions from probability. I am stuck at this question. Can somebody help me to solve this. I would...

• Replies: 3
• Views: 1,664
08-13-2015, 12:33 AM
47. ### help with homework qouestion

suppose that an admission test at a certain college is designed so that the probability of passing it is 60%. The probability that among 20...

• Replies: 2
• Views: 2,121
08-10-2015, 03:35 PM
48. ### Triangular distribution

Hi all, I have a quick question and I hope you can address that. if I have two uniformly distributed variables x~ and y~ what would be the...

• Replies: 1
• Views: 1,305
BGM
08-08-2015, 02:41 AM
49. ### Layperson with a question

Hello! A friend of mine recently asked me for help with this, and while we kicked around a few ideas, we weren't really satisfied. That, and the fact...

• Replies: 18
• Views: 4,614
08-06-2015, 09:10 PM
50. ### compromise between efficiency and accuracy

Hi! Not sure I post in the right place, but maybe you can help, and some probabilities can be introduced in discussion for the following problem:...

• Replies: 0
• Views: 1,030
08-06-2015, 10:36 AM
51. ### Noob question about "combined" probabilities.

Hello! Sorry for my poor english, I´m from Argentina. And sorry too if I´m in the wrong place. I need some knowledged about stats and this forum...

• Replies: 10
• Views: 1,850
08-04-2015, 09:16 AM
52. ### Questions on likelihood and MLE, help please!

Hey guys, got few questions on likelihood and MLE stuff and hope to get some help and advises on them please. Question Pr(X=x|p) = ((1-p)^(x-1))...

• Replies: 0
• Views: 954
08-04-2015, 02:31 AM
53. ### What is the probability people are forecasting correctly with standard spreadsheets?

It seems that many people are using standard spreadsheets to forecast, getting correlation coefficients, etc. However I decided I needed to write my...

• Replies: 0
• Views: 898
08-03-2015, 08:38 AM
54. ### Hypergeometric distribution appears to have hidden problems

When I was writing a computer program to calculate hypergeometric distributions probabilities I had some funny results. This is because I just used...

• Replies: 2
• Views: 1,198
08-03-2015, 08:15 AM
55. ### Probability of an accident

Looking for help with this problem: A train will pass the same point every 7.5 minutes everyday of the week from 4am to 8am. There are 3380...

• Replies: 6
• Views: 1,476
08-01-2015, 12:24 PM

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