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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: 10,844
09-30-2005, 09:44 AM
1. ### Probability that Bernoulli p-parameter is greater than some value, given N samples?

Hello everybody, I have the following question. Assume I observe N outcomes from a Bernoulli random variable with unknown success parameter p....

• Replies: 5
• Views: 205
08-14-2014, 01:52 PM
2. ### Multi-level Bayes

I guess that this is a multi level Bayes problem but there maybe a better technical name for it that I am not aware. Three jars contain tokens of...

• Replies: 2
• Views: 109
08-13-2014, 12:35 PM
3. ### exponential and deterministic random variable mix

Assume that there is a Poisson random process which has a rate of λ that produce samples which has an exponentially distributed inter-arrival times,...

• Replies: 3
• Views: 173
BGM
08-13-2014, 07:28 AM
4. ### Set Completion Problem for a Set of Collectable Objects

I'm trying to do some probability analysis for a digital collectable game called SolForge. There is a particular point in my analysis where I'm not...

• Replies: 8
• Views: 189
BGM
08-10-2014, 05:09 AM
5. ### Given an Average for Drawing 6 Times, What Are the Odds When Drawing Once?

Suppose we draw 6 times, with replacement, from a deck of cards with four suits. We do not know how many cards of each suit there are, nor how many...

• Replies: 1
• Views: 105
BGM
08-10-2014, 04:47 AM
6. ### Statistically different tops for 2 parabolas with non-normal distributed data

For situation 1 and 2 from my data came two parabola relations between variables X and Y. (the two parabolas have both a maximum) My question is...

• Replies: 8
• Views: 371
08-08-2014, 11:20 AM
7. ### a question about discrete RV

hello, I have a question about discrete RV. Five fair coins are tossed. The coins that fall on "Head" are removed and the rest of them are tossed...

• Replies: 11
• Views: 216
08-08-2014, 07:38 AM
8. ### Drawing tokens from a bag - probability of getting 2(a) out of 3 draws

EDIT: Please see my last post for my latest revelation/question regarding this problem! Hi all, first time poster here... I'm creating a...

• Replies: 3
• Views: 168
08-07-2014, 12:08 PM
9. ### Ploting Positions from Peak Over Thresold Series

Hello. I have a little confusing with some aspect related to the Peak Over Thresold Series and differencing the methodology of analysis from that...

• Replies: 0
• Views: 71
08-06-2014, 10:54 AM
10. ### Building confidence intervals using Coefficient of variation

Hi I have a doubt and i need to understand it. At my work, my colleagues use the coefficient of variation for doing confidence intervals. Not...

• Replies: 7
• Views: 189
08-05-2014, 12:51 PM
11. ### Looking for an elegant mathematical expression

Hi to you all, i am new at this forum and i am glad there is such. Problem description suppose i am playing two seperate games (independently!)...

• Replies: 2
• Views: 135
BGM
07-31-2014, 02:46 AM
12. ### Can't justify 'correct' answer

I thought I understood sampling without replacement fairly well, but this problem has me stumped as the answer that I calculate doesn't appear to be...

• Replies: 2
• Views: 153
07-29-2014, 07:29 PM
13. ### Logistic Regression Problem

Hi! My collegue is developing a logistic regression to predict the probability of a customer taking up a particular credit card. Let's call...

• Replies: 5
• Views: 299
07-28-2014, 09:57 AM
14. ### Number serviceable at given time

If I have 50 systems each operating 400 hours per year with an MTBF of 900 hours how do I calculate how many would be serviceable at one time?...

• Replies: 12
• Views: 270
07-28-2014, 08:40 AM
15. ### Question about well-suited poker hand

Hi, I have the following question: A peculiar deck of playing cards is like a regular deck, but has five suits: spades, hearts, diamonds, clubs,...

• Replies: 2
• Views: 205
07-27-2014, 09:26 AM
16. ### Probability of sequences having 1-4 distinct numbers

This is more of combinations problem, but I need to count the number of ways in order to get the probabilities. I would like to find the number...

• Replies: 1
• Views: 114
07-27-2014, 02:43 AM
17. ### Stochastic Integral

Hi there, I created an account here trying to get some help on my problem. I'm really desperate as I'm going to need this for my work on my...

• Replies: 4
• Views: 284
07-23-2014, 06:34 PM
18. ### Probability based on multiple pieces of information

It's been about 20 year since my last stats class and I'm working on a fun little side project that involves some probability. I'm having some...

• Replies: 9
• Views: 293
07-22-2014, 12:57 PM
19. ### Normal and standard distribution question

I have X \sim N(0,1) and Y \sim N(\mu,\sigma^2) Apparently then Y =\sigma X + \mu I can't quite see how, and can't find anything on the...

• Replies: 6
• Views: 348
07-21-2014, 11:47 AM
20. ### Group Assortment Measure

Hi I need a formula that returns a value representative of the amount of ‘assortment’ a group shows. The groups are made up of individuals, all of a...

• Replies: 0
• Views: 125
07-19-2014, 10:53 AM
21. ### PDF of (nearly) collinear variables

My question is motivated by a problem with estimation by maximum likelihood. In simple terms, I want to estimate a parameter \beta and have three...

• Replies: 1
• Views: 165
BGM
07-18-2014, 10:46 AM
22. ### Probability of a sequence....

HI Folks, New to the forum. It's nice to find a forum in this area. I hope someone can help me out. My goal is to determine if it is possible to...

• Replies: 5
• Views: 396
07-12-2014, 06:41 PM
23. ### Need some help with probability and dice

Hi guys, I'm making a board game and ran into some probability problems with dice. I use custom dice (green, blue, red, and yellow). The same...

• Replies: 3
• Views: 237
BGM
07-10-2014, 03:10 AM
24. ### Exam Question / need help

3-Suppose that you are in charge of marketing airline seats for a major airline company. Four days before the flight you have 12 seats remaining on...

• Replies: 2
• Views: 295
07-09-2014, 03:15 PM
25. ### How do you calculate and relate odds from two different experiments?

a) Lets say I have a sack with 119 white balls and 1 black one. Pw=119/120 almost 99.17 % b) A guy called John comes and pick randomly picks a...

• Replies: 0
• Views: 184
07-08-2014, 04:27 PM
26. ### Uniform Distribution - probabilities

Hi guys, I am trying to solve an exercise but it seems to bem somehow strange. It is an experiment where A believes that men are bigger than women...

• Replies: 2
• Views: 155
07-08-2014, 09:01 AM
27. ### IP probability question

hi guys. as you know, IP is a combination of 4 parts. every part is from 0-255, for example 234.32.135.7. now, my question is, what is the...

• Replies: 6
• Views: 401
07-08-2014, 07:12 AM
28. ### Would love some assistance with understanding this puzzling probability "game"

Hello everyone, This is my first post here, so please be gentle :). I'd like to thank everyone in advance for any help that can be given. ...

• Replies: 3
• Views: 299
07-05-2014, 06:18 PM
29. ### Probit regression - Interpretation of marginal effects of IVs in log/percentage form

Dear talkstats-community, I already spent hours on websearch for an answer on a question I have regarding the interpretation of marginal effects...

• Replies: 1
• Views: 214
07-04-2014, 10:56 AM
30. ### What are the chances?

Question: How many times must A occur in order for C to occur 3 times and D to occur once? Every time A occurs, there is a 1 in 2,500 chance that...

• Replies: 1
• Views: 252
07-02-2014, 05:58 AM
31. ### Binomial distribution ! Need help!

Hi, plz tell me if method to solve these question is correct or not! q)In a call centre 180 calls are received at random over a period of 12...

• Replies: 0
• Views: 165
06-28-2014, 11:05 AM
32. ### Poisson distribution!! Need help

Hi, Need help in solving few poisson distribution questions q)A dealer receives hard disks made by a certain manufacturer who on an average gives...

• Replies: 0
• Views: 95
06-28-2014, 10:59 AM
33. ### Probability and forward error correction by parallel transmission

I need a formula to express the probability of being able to correct single digit errors in a transmitted string of digits by transmitting the string...

• Replies: 0
• Views: 231
06-28-2014, 08:27 AM
34. ### Traffic light probability question.Need help!!

Hi, Need help to solve this probability question. At a certain traffic signal red for 30 seconds, yellow for 5 seconds, and green for 25 seconds....

• Replies: 0
• Views: 82
06-27-2014, 04:22 PM
35. ### Need help to solve Probability question!

Hi, Need help to solve this probability question! A supplier of company X makes on average 5 defective pieces.The company accepts a sample if...

• Replies: 0
• Views: 80
06-27-2014, 04:14 PM
36. ### Simple Probability Question

OK, so I am wondering about something and am not good with probability, but maybe someone here has the answer You have a die with only 4 sides,...

• Replies: 2
• Views: 329
06-25-2014, 11:03 AM
37. ### Poisson distribution, university exam quistion

I have the following exam question witch I would appreciate some help with Question: In certain parts of a car one uses plastic plates. These...

• Replies: 1
• Views: 300
06-22-2014, 02:10 AM
38. ### Probability problem

Ques- Suppose there are two bags A and B. A contains n white balls and 2 Black balls and B contains 2 white and n black balls. One of the two bags is...

• Replies: 1
• Views: 215
06-20-2014, 02:37 PM
39. ### Customer Retention Probability

I'm not a statistician so forgive my ignorance. Here's what I'm trying to do: I have a list of all customers active and cancelled. I have tables...

• Replies: 2
• Views: 246
06-19-2014, 01:27 AM
40. ### Explanation counting principle problem

If a travel agency o ers special weekend trips to 12 di erent cities, by air, rail, bus, or sea, in how many di erent ways can such a trip be...

• Replies: 4
• Views: 259
BGM
06-18-2014, 12:50 AM
41. ### Probability of Winning

Hi need some help to understand how the below probability can be determined If I pay $100 to play a game where if lose i lose the$100 but in case...

• Replies: 1
• Views: 286
06-11-2014, 01:56 AM
42. ### Soccer betting probability, risk and odds question - help

Hello, Consider two different cases of soccer betting. 1) The first consists of 32 different sets of matches (each consisting of 5 matches with...

• Replies: 0
• Views: 218
06-10-2014, 08:36 AM
43. ### Hypothesis testing : Help to formulate null hypothesis

Hi all I'm currently doing a hypothesis testing to test a set of sample data (large sample size). From my knowledge of statistics, the null...

• Replies: 3
• Views: 289
06-10-2014, 07:16 AM
44. ### Help with interpreting data regarding religious Affiliation and aspirations to cheat

An article is claiming that likelihood to cheat can be predicted by religious affiliation. I have provided some of their data on their sample of...

• Replies: 3
• Views: 458
06-07-2014, 09:34 PM
45. ### Probability of achieving an expected rate of return by targeting a constat VaR level

Hi all, I am new to this website. Trying to infer the probability of achieving an expected annual rate of return say 10% (assuming my daily returns...

• Replies: 3
• Views: 269
06-07-2014, 03:12 PM
46. ### Prove that the SD of an asymmetric function is larger than the SD of a symmetric one

How can I prove that the standard deviation of an asymmetric function (mean>median>mode) is larger than the standard deviation of a symmetric one...

• Replies: 8
• Views: 313
06-06-2014, 01:02 AM
47. ### Calculating two-tailed probability for Monte Carlo sampling distribution

Hi, First off, I am new to this forum and would like to take this chance to say hi to everyone. I am currently working on a statistics project,...

• Replies: 0
• Views: 302
06-04-2014, 02:43 PM
48. ### Homework

This particular problem has had me "stumped" for several hours. I need to turn in the assignment, however want to make sure my answer is correct. I...

• Replies: 1
• Views: 159
06-04-2014, 12:15 PM
49. ### comparison with normal distribution truncated

Hello, I would to know how to calculate the probability that X > Y when Y is greater than a given value p (X and Y are random variable following...

• Replies: 7
• Views: 377
06-04-2014, 06:53 AM
50. ### How to interprets this algorithm

I make some algorithms to estimate the optimal values. and i want to model it algorithms using probabilistic theorem. but i dont know which...

• Replies: 0
• Views: 144
06-02-2014, 09:12 AM
51. ### Bayes' Theorem applied to poker?

please delete this post

• Replies: 1
• Views: 234
06-01-2014, 11:00 AM

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