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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: 11,268
09-30-2005, 09:44 AM
1. An event and its complement

My wife was overdue clearing customs so I thought the probability of her showing up any minute was increasing. But then I thought, suppose -there...

• Replies: 1
• Views: 55
BGM
Today, 12:38 AM
2. The Probabiliy of Making it

I have 1,2,3,4,5,6,7,8,9,10,11,12 teams. Only 8/12 teams make it to the playoffs. What is the probability that 3,4,5,8,9,10 are part of the 8 teams...

• Replies: 3
• Views: 180
BGM
Yesterday, 01:36 AM
3. Black Swans, non-normal distributions

I am looking for a reference to a popular science magazine article. The point of it was that in the real world we find populations that are...

• Replies: 2
• Views: 214
10-22-2014, 08:11 PM
4. Stats homework help NYS

New York Stock Exchange. Suppose that the percentage returns for a given year for all Stocks listed on the New York Stock Exchange follows a...

• Replies: 0
• Views: 109
10-22-2014, 02:20 PM
5. 600 hotdogs. homework help

Not quite sure how to do B or C. Thanks for the help! Jake runs the concession stand for a Chicago area minor league baseball team. He knows that...

• Replies: 0
• Views: 130
10-21-2014, 08:56 PM
6. Committee Combination

Hi. I have used the below formulation of the problem. Kindly let me know whether I am correct or wrong. Q. "A condominium management committee...

• Replies: 0
• Views: 64
10-21-2014, 03:20 PM
7. Probability of Absolute Return

Mean = 0.04% SD = 1.9% of a percentage rate of return recorded daily for one year on an asset. What is the probability of an absolute return on any...

• Replies: 0
• Views: 78
10-21-2014, 05:36 AM
8. Why this Frequency Polygon is not correct?

Hi guys! I stumbled upon this blurry question from one of my lab old exams, in statistics elective course. I will leave you to check the...

• Replies: 0
• Views: 83
10-21-2014, 02:40 AM
9. Finding Minimum Probability

Hi. Below is the question in my homework. I don't know whether I've to solve this using Bayes' theorem or I have to provide a general answer. ...

• Replies: 0
• Views: 87
10-20-2014, 02:11 PM
10. Bayes Probability question

Question: Yearly automobile inspections are required for residents of the state of Pennsylvania. Suppose that 18% of all inspected cars in...

• Replies: 0
• Views: 108
10-19-2014, 04:57 AM
11. Closing Difference between two numbers with confidence limits.

Company A tested its widgets and found that when they tested 10000 of them, 2010 of them failed. They tested the widgets of their competition but...

• Replies: 0
• Views: 178
10-17-2014, 02:26 PM

kindly help (or provide hints) on below question: Suppose that you pay $1024 to enter a coin tossing game. A biased coin with head probability... • Replies: 5 • Views: 309 BGM 10-16-2014, 12:48 AM 13. Convergence in Probability Hello all. I have a two statements. One says -\frac{1}{T} \sum_{t=1}^T X_t \rightarrow a in probability as T \rightarrow \infty The... • Replies: 2 • Views: 217 10-13-2014, 04:10 PM 14. Simple Bernoulli question I am sort of baffled by this. The point is to simulate how often students will be right when guessing on a multiple choice tests with 5 responses. It... • Replies: 13 • Views: 310 10-13-2014, 03:24 PM 15. Drwaing the probability distribution of the population from a sample Hey there, this might be a bit of an uneducated question, but I want to make sure I don't get anything wrong. I'm wondering if one can draw... • Replies: 1 • Views: 198 BGM 10-13-2014, 01:08 PM 16. Please help me start this question. Consider an experiment where we roll a single die once and let X represent the number of dots that appear on the top face of the die. Suppose that... • Replies: 8 • Views: 542 10-12-2014, 11:19 AM 17. Simple but quite confusing Problem Hi all, I'm solving the problems in probability but, the question below looks simple but quite confusing to me. Regarding question 2-(c), any... • Replies: 1 • Views: 151 BGM 10-12-2014, 10:49 AM 18. Negative Binomial Distribution Hi, Regards • Replies: 0 • Views: 132 10-12-2014, 08:54 AM 19. Probability theory: The Quantum Measurement Problem There is a famous double-slit experiment in Quantum Mechanics that attempted to measure whether electrons and photons are comprised of particles or... • Replies: 2 • Views: 201 10-10-2014, 08:29 AM 20. probability question Five cards are dealt at random and without replacement from a standard deck of 52 cards. What is the probability that the hand contains all 4 aces if... • Replies: 0 • Views: 135 10-09-2014, 02:09 PM 21. Difference of expectations of RV's given arbtrary pdfs I've been beating my head on this for a while... Let X and Y have pdf's f & g respectively such that \begin{cases} f(x) >= g(x) & \mbox{if } x... • Replies: 1 • Views: 162 BGM 10-09-2014, 04:23 AM 22. Probability that X restaurants will be visited if Y people choose independently I am trying to determine for Y people selecting from X restaurants (with an equal probability) what the expected value of the number of restaurants... • Replies: 2 • Views: 143 JPC 10-08-2014, 07:37 AM 23. Prob: Normal probability distribution The mean cost of domestic airfares in the United States rose to an all-time high of$385 per ticket (Bureau of Transportation Statistics website,...

• Replies: 1
• Views: 640
10-07-2014, 07:39 PM
24. two normal distributions

the post no longer relevant - outdated

• Replies: 0
• Views: 190
10-06-2014, 06:17 PM
25. inverse of the students t-distribution

Hi All, I am trying to use calculate for two-tailed inverse of the students t-distribution function presented by Excel functions like...

• Replies: 3
• Views: 183
10-03-2014, 12:27 PM
26. Mean/Var for Loss rate given Loss and Balance

We have a variable X (Loss Dollars) with known Mean and Stdev, and variable Y (Balance) with known Mean and Stdev. Let’s also assume we know the...

• Replies: 0
• Views: 130
10-02-2014, 09:38 AM
27. Process Control

Hi, Could anyone help me with a statistical process control problem i have? I am measuring a process which gives a measured value range from 0...

• Replies: 7
• Views: 258
10-01-2014, 09:34 AM
28. inverse of the students t-distribution

Dear All, I have a issue about two-tailed inverse of the students t-distribution. I am trying to use calculation for two-tailed inverse of the...

• Replies: 0
• Views: 114
10-01-2014, 05:52 AM
29. How to calculate variance of binomial variable where base (n) is binomial also

Hi I have a survey that collects data from each respondent on gender and also on attitudes. We don't know in advance how many men or women will...

• Replies: 0
• Views: 105
10-01-2014, 02:46 AM
30. Identify Statistically Significant Data Point when Mean/Variance Unknown

I am conducting a screen of a wide range of compounds and generating measurements for their effect on a protein. We have conducted some work on...

• Replies: 0
• Views: 133
09-30-2014, 05:11 AM
31. law of total probability - variation formal names?

Hello, there are different variations of the law of total probability. For example, the probability of 3 discreet events all occurring is: A1 *...

• Replies: 0
• Views: 126
09-28-2014, 04:59 PM
32. probability density function

I am having difficulty resolving the two exercises below 1)Consider the function Find the E(X). I now is a Poisson(y), but i don't know how to...

• Replies: 0
• Views: 125
09-28-2014, 04:00 PM
33. Probability of winning an n-game series

With the baseball playoffs coming up, I was fiddling around with how to calculate the probability that one team would win a playoff series, given P,...

• Replies: 3
• Views: 235
BGM
09-28-2014, 03:48 PM

A study undertaken by the Miami-Dade Supervisor of Elections in 2002 revealed that 44% of registered voters are Democrats, 37% are Republicans, and...

• Replies: 2
• Views: 274
09-26-2014, 04:20 AM
35. Expected Value & Variance from Z = min (X,Y)

Dear all, I have an assignment, but I don't understand yet which formulas I have to use to solve it. Here is the question: There is an...

• Replies: 1
• Views: 243
BGM
09-24-2014, 03:48 AM
36. Need help with geometric pmf

Hi all, Here's the problem: Let X be the number of accidents per week in a factory. Let the probability mass function of X be f(x) = 1/(x+1) -...

• Replies: 2
• Views: 220
09-22-2014, 01:26 PM
37. simulating correlated, non-normal data: WHY DOES THIS HAPPEN!?

i have been experimenting with different methods to generate correlated, non-normal data for comprehensive-exam purposes and i'm finding something i...

• Replies: 21
• Views: 493
09-21-2014, 08:59 PM
38. Comparing proportions

Hello there: I have a couple of questions about comparing proportions. 1) why do we use a z-test to compare proportions but t-test to compare...

• Replies: 0
• Views: 130
09-21-2014, 01:35 PM
39. Homework help with conditional probability distribution

Hi, I was wondering if I could get some help with this homework problem. We are given that X~U(0,1) and conditional distribution of Y|X=x is...

• Replies: 1
• Views: 257
09-17-2014, 12:54 AM
40. Astronomer's estimate

I am trying to solve the problem but end up with no where, Please help me to solve the problem Astronomers estimate that as many as one hundred...

• Replies: 3
• Views: 214
09-16-2014, 03:59 PM
41. Tricky probability problem

Hi, I was wondering if you could help me out with a problem I have: I need to work out the probability that someone will be able to complete a...

• Replies: 1
• Views: 193
09-16-2014, 05:24 AM
42. Brain Teaser

It's here:http://www.braingle.com/palm/teaser.php?id=29228&comm=1 I thought that surely the answer must be 0.5 until I considered writing a test...

• Replies: 11
• Views: 483
09-08-2014, 11:43 PM
43. Probability of Unconventional Food Item Alleviating Medical Problem Multiple Times

For about 2 years, a medical problem has more or less repeated, as follows: The problem normally lasts approximately 3 weeks and then goes away...

• Replies: 0
• Views: 151
09-08-2014, 02:50 PM
44. Mathematical intuition for variance

One explanation to "Why do we square the deviations" is.. "The sum of the square deviations of any set of observations from their mean is the...

• Replies: 1
• Views: 123
09-08-2014, 10:59 AM
45. if z-value is a negative number, how can i calculate the Probability?

Hello guys, :) I have an important question I want to ask. I have already searched the web and my statistics book but I can not find the answer :(...

• Replies: 2
• Views: 244
09-04-2014, 10:14 PM
46. My article on runs testing random bit sequences

The article is here: http://home.ptd.net/~artnpeg For smaller values of the mean, the Poisson Distribution with cumulative sums is used. For larger...

• Replies: 0
• Views: 166
09-04-2014, 05:12 AM
47. probability poisson distributed

hi can somebody help me with this question please.

• Replies: 5
• Views: 574
09-01-2014, 10:25 AM
48. Non central Chi square distribution and approximations Matlab

Hello! I have a problem with the computation of a chi squared distribution in Matlab. I have a quadratic form : y' Px y, this form has a non...

• Replies: 3
• Views: 268
08-29-2014, 04:17 PM
49. 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: 2
• Views: 333
08-29-2014, 11:10 AM
50. Computing probability

fX(x)= (3/8)*x*x 0<x<2 fY(y)= 1/x x<y<2x P(1<y<3) Now how do i do this ? Do i have...

• Replies: 1
• Views: 212
BGM
08-29-2014, 03:47 AM
51. Drawing variates from this density function

Hi, I have derived the following probability density function, which I would like to draw random variates from as part of a Gibbs sampling step: ...

• Replies: 2
• Views: 192
08-28-2014, 07:01 PM
52. Poisson proces and binomial

I'm trying to find the distribution of the number Y of arrivals in the timeinterval \subset where X(t) is number of arrivals in a poissonproces...

• Replies: 2
• Views: 144
08-28-2014, 10:15 AM

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