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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: 31,080
09-30-2005, 09:44 AM
1. ### 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: 1,421
07-29-2014, 07:29 PM
2. ### 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: 2,380
07-28-2014, 09:57 AM
3. ### 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: 2,650
07-28-2014, 08:40 AM
4. ### 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: 2,749
07-27-2014, 09:26 AM
5. ### 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: 2,127
07-27-2014, 02:43 AM
6. ### 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: 1,700
07-23-2014, 06:34 PM
7. ### 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: 1,902
07-22-2014, 12:57 PM
8. ### 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: 1,919
07-21-2014, 11:47 AM
9. ### 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: 955
07-19-2014, 10:53 AM
10. ### 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: 1,496
BGM
07-18-2014, 10:46 AM
11. ### 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: 2,658
07-12-2014, 06:41 PM
12. ### 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: 2,001
BGM
07-10-2014, 03:10 AM
13. ### 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: 2,043
07-09-2014, 03:15 PM
14. ### 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: 1,987
07-08-2014, 04:27 PM
15. ### 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: 1,454
07-08-2014, 09:01 AM
16. ### 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: 2,803
07-08-2014, 07:12 AM
17. ### 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: 1,791
07-05-2014, 06:18 PM
18. ### 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: 1,411
07-04-2014, 10:56 AM
19. ### 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: 1,304
07-02-2014, 05:58 AM
20. ### 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: 4,462
06-28-2014, 11:05 AM
21. ### 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: 3,139
06-28-2014, 10:59 AM
22. ### 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: 1,314
06-28-2014, 08:27 AM
23. ### 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: 849
06-27-2014, 04:14 PM
24. ### 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: 1,331
06-25-2014, 11:03 AM
25. ### 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: 2,646
06-22-2014, 02:10 AM
26. ### 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: 1,566
06-20-2014, 02:37 PM
27. ### 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: 1,590
06-19-2014, 01:27 AM
28. ### 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: 3,810
BGM
06-18-2014, 12:50 AM
29. ### 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: 1,512
06-11-2014, 01:56 AM
30. ### 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: 1,707
06-10-2014, 08:36 AM
31. ### 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: 1,992
06-10-2014, 07:16 AM
32. ### 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: 2,033
06-07-2014, 09:34 PM
33. ### 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: 1,645
06-07-2014, 03:12 PM
34. ### 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: 1,753
06-06-2014, 01:02 AM
35. ### 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: 1,275
06-04-2014, 02:43 PM
36. ### 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: 1,522
06-04-2014, 12:15 PM
37. ### 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: 1,930
06-04-2014, 06:53 AM
38. ### 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: 1,413
06-02-2014, 09:12 AM
39. ### Bayes' Theorem applied to poker?

• Replies: 1
• Views: 1,957
06-01-2014, 11:00 AM
40. ### How to get OR in STATA after xtlogi..,fe (multilevel)

Hi guys I have been trying to get the odds ratios for my logistic multilevel regression with a fe estimator. I type my regression and then the...

• Replies: 0
• Views: 1,381
05-31-2014, 02:27 AM
41. ### least square estimator of a random variable

Suppose we have an observation y = c+ e where c is an unknown constant and e is error with the pdf = exp(-e-1) for e >-1 . We want to determine the...

• Replies: 1
• Views: 1,481
05-28-2014, 12:46 PM
42. ### Time series expectation

Maybe it's because i've been at it for 8 hours straight today, but i'm stumped trying to show this is true: E=\sigma^2 Any help might spare my...

• Replies: 1
• Views: 1,372
05-28-2014, 10:15 AM
43. ### Probability vs sample size graph.

Hi, if have a question about how a graph of probability vs sample size might look. I know the line would never be linear but it could either sigmoid...

• Replies: 6
• Views: 2,273
05-23-2014, 11:36 PM
44. ### To check whether data is normally distributed or not

I have calculated mean, median and mode for set of data consisting of 1140 values. Output is: mean = 108.27 mode = 107 and median = 108. ...

• Replies: 3
• Views: 1,476
05-23-2014, 09:01 PM
45. ### Homework exercise

I have a homework which can not be fully resolved with my knowlage: Firm has 10 employees, 2 womens and 8 mens. The Management Board will randomly...

• Replies: 10
• Views: 3,900
05-23-2014, 01:14 PM
46. ### Probability question. Pi = ??

Q: It is noted that 8% of abc students are left handed, if 20 students are randomly selected, calculate Probability that none of them are left...

• Replies: 4
• Views: 5,307
05-19-2014, 02:31 AM
47. ### Need help determing what formula to use

Hello guys and gals, I have a problem with my homework since I have no idea what kind of formula to use. I have been searching for 1.5hour now to...

• Replies: 4
• Views: 2,237
05-18-2014, 07:05 AM

Next weekend you will be participating in a 12 km cross country trail race on Table Mountain.The average time between two successive wild animal...

• Replies: 0
• Views: 2,238
05-17-2014, 05:05 PM
49. ### Probability of 11 points first in a game? ** Simple **

Hi all, I am a newbie here and has some simple probability, just would like to gauge how far i am... A match can be won with two ways: (1)...

• Replies: 0
• Views: 1,402
05-16-2014, 12:31 PM
50. ### Application of binomial distribution

Hello all, this is my first post. I am a practicing engineer facing a dilemma. Our resident statistician is out for the MONTH, and I have a deadline...

• Replies: 0
• Views: 2,266
05-16-2014, 08:53 AM
51. ### Geometrical distribution problem

I am trying to solve this problem: X_1, X_2,..., X_100 are independent and have geometrical distribition with probability of success 1/2...

• Replies: 1
• Views: 1,546
05-15-2014, 09:28 AM
52. ### Skydiving question... should be easy

Hi all. I'm a skydiver and I just wanted to see if somebody could help me with a quick probability question. So, if we assume that there is a one...

• Replies: 2
• Views: 1,425
05-15-2014, 02:36 AM
53. ### Sum of n random variables with normal distribution

I am struggling with this problem: Independent random variables X_1, ... , X_n have normal distribution with mean 0 and variance 2. What is the...

• Replies: 2
• Views: 1,841
05-14-2014, 03:13 PM

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