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05-10-2017
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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: 30,178
09-30-2005, 09:44 AM
1. ### Determining p-values, significant cutoffs and false discovery in non-normal data

Hi, I have a set of data points from a genetic study. I wish to ascertain which of these data points is statistically significant. The data is not...

• Replies: 2
• Views: 1,324
06-21-2013, 12:03 PM
2. ### Property of independent random variables

hello! I'm trying to understand the following property: Let X and Y be independent random variables z: = X + Y. Then where fZ (z) is the...

• Replies: 3
• Views: 1,688
06-21-2013, 11:36 AM
3. ### Quick Probability Increase Logic Question

I have 2 events, each increase the overall probability by 20%, events are independent of each other: Original probability 10/100 1st event...

• Replies: 1
• Views: 1,990
06-21-2013, 11:25 AM
4. ### Help with probabilities question

It's kind of complicated, and I'm not even sure how to phrase it in statistics/probabilities terminology, so I'll just describe the problem: You...

• Replies: 1
• Views: 1,742
BGM
06-21-2013, 05:11 AM
5. ### Sufficiency and contional sufficiency?

Suppose p(x,y|a)=p(T(x),y|a)h(x,y) and p(x,a)=p(T(x)|a)g(x), where a is the parameter of inference. Then, g(x)= {int p(T(x),y|a)h(x,y)}/ {int...

• Replies: 0
• Views: 1,360
06-20-2013, 05:41 PM
6. ### what method to use?

Hi: Here is the problems to solve: There are a certain amount of balls. They can be white, blue, green and red in color. There is a machine can...

• Replies: 3
• Views: 981
BGM
06-20-2013, 12:07 PM
7. ### Central limit theorem - Approximation the Sum of Bernoullis to Normal Distribution

Hello, I'm new in this forum and I would like to ask for your help. I have a set of Independent Bernoulli random variables, but they are not...

• Replies: 9
• Views: 2,434
06-19-2013, 02:47 PM
8. ### Joint distribution from multiple marginals

Consider an experiment consisting of a repeated trial with two random Bernoulli (=binary) variables, A and B. Each trial consists of multiple...

• Replies: 4
• Views: 1,707
06-19-2013, 06:21 AM
9. ### Different Interpretations of the Central Limit Theorem

My friend and I are having an argument about the meaning of CLT. It led to me build this javascript experiment which you may enjoy:...

• Replies: 2
• Views: 3,286
06-18-2013, 07:33 PM
10. ### Probability of a Time Game in Ruzzle

I am not a statistic savant, but I am mathematically minded. My friend asked me today what I thought the odds were of a game of Ruzzle ending in a...

• Replies: 1
• Views: 2,964
06-17-2013, 03:25 PM
11. ### Poisson Process Problem

People come into a store according to a Poisson process with rate: lambda (t) = 0.0025*t (people / period) Of all the people who arrive between...

• Replies: 4
• Views: 2,139
BGM
06-17-2013, 06:17 AM
12. ### Probability of sum of 6 digit number

Hi, What is the probability of sum of any 6 digit number (ranging from 000000 to 999999) to be equal to 12. Actually I am looking for the...

• Replies: 6
• Views: 3,911
BGM
06-14-2013, 01:42 PM
13. ### Geometric Distribution of 2 Independent Random Variables

Hey Guys, I have an exam coming up for my stats paper soon and as I was looking over past assignment questions I came across this question which I...

• Replies: 1
• Views: 2,648
BGM
06-14-2013, 04:00 AM
14. ### Predicting probability with standard deviations, mean high and low values.

I registered on this forum specifically to ask this question. This is not homework, it's simply a for fun/hobby problem I am trying to solve. This...

• Replies: 5
• Views: 5,180
06-14-2013, 03:55 AM
15. ### Real life example for pairwise independent mutually dependent RVs

Three or more pairwise independent variables may be mutually dependent. There are several mathematical examples like Bernsteins Paradox. I am...

• Replies: 0
• Views: 2,376
06-13-2013, 02:19 PM
16. ### Searching for statistical significance

I need to answer this simple question in order to show that my experimental results are statistically significant. This is probably a very easy...

• Replies: 2
• Views: 1,835
06-13-2013, 08:04 AM
17. ### Lottery Game Question (6/42)

So I'm having a little difficulty with this lottery game question. I think this game is similar to the actual 6/49 game in Atlantic Canada, if anyone...

• Replies: 2
• Views: 3,282
06-12-2013, 04:09 PM
18. ### Probability

According to a survey done by a dealership company, they have 40% of customer who enters the shop that are woman and it says that there are 37% of...

• Replies: 3
• Views: 1,738
06-11-2013, 08:03 AM
19. ### what's the chance that a number n is prime IF....?

so... a compuer science friend of mine and myself were having lunch together and discussing whether or not studying number theory can be your one-way...

• Replies: 9
• Views: 1,366
06-11-2013, 02:33 AM
20. ### Exponential Distribution, X + Y

Hello Guys, I have no clue how to solve the following problem: "X and Y are exponential distributed and independend with the parameter lambda >...

• Replies: 1
• Views: 1,623
06-10-2013, 05:49 AM
21. ### Is this a prob distribution?

Hi, How do you find an average of a reducing sample: miles 0-10 10=20 20-30 30-40 midpoint 5 15 25 30 cars 5 4 3 1 failures 0 3 2 1 rate...

• Replies: 0
• Views: 1,104
06-09-2013, 03:34 PM
22. ### Show that a stochastic variable is allmost this expression.

Hi We have a binomial situation where the p value is: p=\frac{2}{a}, our end goal is to find an estimator for a, and an estimate for this...

• Replies: 8
• Views: 1,649
06-09-2013, 11:05 AM
23. ### Multiplication (Bernoulli Distribution)

Hello, I'm not sure, if I understand the following question right: There are two independend Variables X and Y with X ~ Bernoulli(p) und Y ~...

• Replies: 1
• Views: 1,925
06-09-2013, 10:00 AM
24. ### Probability on a normal curve

Hey all - It's been a long time since I was in school looking at probability and statistics. i have a bit of a difficult question for me. I have...

• Replies: 10
• Views: 1,622
06-07-2013, 01:47 PM
25. ### Probability of queuing

We are students and we developing the project of a music festival that takes place in 3 venues. We have identified some risks; one of those is...

• Replies: 2
• Views: 1,712
06-06-2013, 11:31 AM
26. ### Different arrangments of n 0's and m 1's

This simply stated problem is giving me some trouble: How many different ways can I arrange n 0's and m 1's? Perhaps someone would direct me...

• Replies: 5
• Views: 1,639
06-06-2013, 05:54 AM
27. ### Estimating parameter from conditionals of non-independent data

The context of this problem is the estimation of the distribution of a parameter v given sets of data A and B, where A and B are not independent. ...

• Replies: 0
• Views: 1,201
06-02-2013, 06:33 PM
28. ### Two Variables with the same distribution

Hello, I study IT and need help with the following problems: 1) two variables, Y and Z have the same distribution. Y and Z can be 0 or 1. I need...

• Replies: 2
• Views: 1,297
06-02-2013, 01:30 PM
29. ### Radio Competition - HELP NEEDED!

Hi, I'm a producer on a big (US) Radio station. I'm developing a new competition, but I need help with the probability... The game is simple...

• Replies: 12
• Views: 2,017
05-30-2013, 04:12 PM
30. ### Fitting a Normal Distribution

I am trying to fit a normal distribution with unknown mean and standard deviation based on a sample of observations. I know how to use an approach...

• Replies: 2
• Views: 1,837
05-28-2013, 11:46 PM
31. ### Poisson

The number of pacients that get into the hospital is 36 per day. Wich is the probability that in one hour 4 pacients get in.

• Replies: 7
• Views: 2,018
05-27-2013, 07:18 PM
32. ### Need help developing a probability calculator for game

The goal of this game is to get your opponents life points down to 0 before he gets yours down to 0. You take turns hitting each other until one...

• Replies: 3
• Views: 1,281
BGM
05-27-2013, 05:02 PM
33. ### Question on Probability Distribution

Hi, I am new here, and my name is Jonas. I'm a CS major at a university in the Northeast US. I'm a senior and wrapping up degree requirements which...

• Replies: 2
• Views: 1,585
05-25-2013, 07:43 AM
34. ### Need help figuring this out...

Three gentlemen, Prof. Plum, Mr. Green, and Col. Mustard, have offended each others' honor. They will settle their dispute with a duel truel with...

• Replies: 8
• Views: 2,426
05-24-2013, 10:26 PM
35. ### Question Involving # of Defective Products

So I'm independently studying for exam P/1 and ran across this question in one of the previous exams: A store has 80 modems in its inventory, 30...

• Replies: 1
• Views: 2,181
05-24-2013, 10:02 PM
36. ### Changing the units changes the scale and shape of Weibull pdf?

I don't know how to delete the post.:(

• Replies: 0
• Views: 1,129
05-24-2013, 06:14 PM
37. ### Probability of occurance-I don't understand my instructor's solution

Hello: I am in a statistical process control class and we are studying control charts. My instructor gave the following problem: For the...

• Replies: 10
• Views: 1,731
05-23-2013, 03:40 PM
38. ### Test significance of gene overlap between two gene lists by chance

I am very new to bioinformatics and statistics so trying to ask around for help. I am working with expression data from two different antibody...

• Replies: 3
• Views: 6,088
BGM
05-22-2013, 11:32 AM
39. ### Keno problem: last ball doubles the prize.

Hi, I'm trying to solve this problem, but apparently, Im going in the wrong direction. It's a Keno Game, you choose 15 balls out of 80...

• Replies: 0
• Views: 825
05-20-2013, 10:05 PM
40. ### Chance of Beating the House In Roulette

Hi, I was wondering how I could calculate this. I tried two different methods and got the same answer, but I'm not sure if I'm attacking the problem...

• Replies: 1
• Views: 2,135
05-20-2013, 11:55 AM
41. ### Binomial variability

Hi, I have in my research 45 children who took a test twice and the score is either (correct or incorrect). I calculated confidence intervals for...

• Replies: 0
• Views: 1,154
05-19-2013, 02:25 PM
42. ### 'Shifted' Poisson Processes?

Hi all. I’m a graduate student in ops research, but my research is in the optimization side of things more so than the stochastic processes. I...

• Replies: 2
• Views: 10,503
BGM
05-18-2013, 03:05 PM
43. ### Probability of event vs. (?) probability of event occurring by chance

Hi there: This is my first post so please forgive me if I am in the wrong section. This is not technically "homework", but it is a question that I...

• Replies: 6
• Views: 2,691
05-17-2013, 05:29 PM
44. ### Minimum of 2 dependent Random Variables

Guys, how can I find the distribution of the min between two random variables, if the two random variables are not independent?

• Replies: 1
• Views: 3,266
BGM
05-17-2013, 12:31 PM
45. ### Poisson Distribution

Hai everyone, I am stuck with this exercise Arrivals to a bank automated teller machine (ATM) are distributed according to a poisson...

• Replies: 4
• Views: 2,923
05-16-2013, 02:29 PM
46. ### Exercise probability

Hi all, I would need some help with a probability exercise. I am sure you can help me. So here it is: We have an urn which contains 1000 balls...

• Replies: 3
• Views: 2,206
05-15-2013, 04:46 PM
47. ### Expected Value Distribution

Hi, I have a question pertaining to the problem: The expected value of the number of customers entering a shop during a 15 minute time interval...

• Replies: 6
• Views: 1,751
05-15-2013, 04:13 PM
48. ### Probability distribution

hi everyone, I am unable to solve this exercice can you help me please ? Exercice : Starbucks has entered into an agreement with a...

• Replies: 4
• Views: 1,822
05-15-2013, 01:30 PM
49. ### Poisson Process Question (Last)

Could someone kindly check whether or not my answer is correct to part a of the question. Ive listed the solutionts to part b) which I found on the...

• Replies: 0
• Views: 1,046
05-15-2013, 12:14 PM
50. ### Possion Process Question

Uploaded with ImageShack.us I attempted this question and I was wondering two things 1) whether the answer is correct 2) and whether the hand...

• Replies: 0
• Views: 1,054
05-15-2013, 12:04 PM
51. ### conditional probability and trial of experiments

Consider a medical test for a disease, D. The test mostly gives the right answer, but not always. Say its false-negative rate is 1% and its...

• Replies: 2
• Views: 1,389
05-15-2013, 07:43 AM
52. ### Binomial probability

A number of trials were run with a high success rate, n = 1700 & 99.9% success How can I calculate (with 95% confidence) the lowest probability of...

• Replies: 8
• Views: 1,869
05-15-2013, 06:24 AM
53. ### Probability: Conditional Vs. Joint Issue

Hi all, Brand new to this site. I've read the posting rules, but please feel free to herd me into the correct way of doing things with this...

• Replies: 1
• Views: 2,072
05-14-2013, 06:39 PM
54. ### 1-bimoncdf vs binomcdf

Hey, everyone. I'm new here, and I was just wondering what the difference is between 1-Binomcdf and Binomcdf?

• Replies: 2
• Views: 3,306
05-14-2013, 12:33 PM
55. ### OC Curve (n, c) Unknown

So, my teacher gave me some extra credit assignment where we're supposed to make a program to find the (n, c) values of an OC Curve... We're given...

• Replies: 1
• Views: 2,213
05-12-2013, 06:16 PM
56. ### Proportion and Expected

The Proportion of college student who take Stats is P=.22 A)If 200 college students are selected at randon, how many would you expect to take...

• Replies: 5
• Views: 1,494
05-11-2013, 09:50 PM
57. ### Probabilities from Excel's RANDBETWEEN

I created a craps (dice) model in Excel using its RANDBETWEEN function and nested IF functions. I noticed that based on theoretical probabilities I...

• Replies: 0
• Views: 1,486
05-10-2013, 10:50 PM
58. ### Not Homework--Need Solutions!

I'm studying for an exam tomorrow. I have last years exam from the same teacher but cannot find solutions and I am stuck! 1: An electric...

• Replies: 1
• Views: 1,866
BGM
05-10-2013, 02:44 PM

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