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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: 30,361
09-30-2005, 09:44 AM
1. 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: 1,280
10-22-2014, 02:20 PM
2. Proof for Pooling

Hello all, I have a research question regarding pooling probability data. The application is population genetics. Assume we have a population of...

• Replies: 0
• Views: 2,404
01-02-2008, 03:09 PM
3. Dirichlet distribution - moments (mean and variance)

For a Dirichlet variable, I know the means and covariances, that is, E = \alpha_i/\alpha_0 Cov =\frac{ \alpha_i (\alpha_0 I -...

• Replies: 12
• Views: 11,842
02-14-2012, 10:56 AM
4. Is a subset of a normal distribution normal?

An easy one for some of you guys here I suspect. Thanks to anyone who can help me with it. I have an application which adds a normally...

• Replies: 4
• Views: 10,357
10-29-2009, 03:54 AM
5. How to use Weibull statistics?

My problem is the following. I have the results of mechanical (tensile) tests performed at different temperatures. I found that below certain...

• Replies: 1
• Views: 1,295
09-06-2013, 10:29 AM
6. Homework Problem

Hi, I am a beginner in statistics, and can't figure out this problem: "In a highly publicized murder trial it was estimated that 25 percent of the...

• Replies: 3
• Views: 4,772
03-31-2011, 12:47 AM
7. Pub Probability Question

Hi, We were discussing the following in the pub and its frustrating me because I can't figure out the answer (15 years on from a maths degree), I...

• Replies: 3
• Views: 2,538
06-17-2008, 11:42 AM
8. One problem - two approaches, two different answers

A test is based upon the average of 5 results. Assuming only random errors in measurement, what is the probability the data is trended (sequential...

• Replies: 0
• Views: 1,159
03-20-2015, 12:52 PM
9. Joint probability distribution

1. An instructor has given a short test consisting of two parts. For a randomly selected student, let X = the number of points earned on the rst part...

• Replies: 1
• Views: 10,850
10-11-2009, 07:28 PM
10. Help me solve this probability question

The owner of a petrol station wished to determine the proportion of customers who use a credit card to pay at the pump. He surveyed 200 customers and...

• Replies: 2
• Views: 2,097
07-06-2011, 04:32 PM
11. Game Entry Statistics

I am trying to figure out the method of calculating the number of times that a certain game must be entered in order to advance to a specific level...

• Replies: 3
• Views: 3,204
08-09-2010, 01:54 AM
12. Probability Simulation Software Recommendation

I am looking for software recommendations that will allow me to define a known multi-level game for the purposes of running simulations to determine...

• Replies: 16
• Views: 9,017
08-19-2010, 10:59 AM
13. 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: 2,998
06-17-2013, 03:25 PM
14. Group Probability Problem

Hi, I'm having a difficult time figuring out an approach to a problem and could use some help -- if I have a team of 5 basketball players, each...

• Replies: 3
• Views: 1,579
12-19-2014, 01:31 PM
15. Probability for a CHi-square, normal, and binomial in Excel.

Never mind...

• Replies: 0
• Views: 1,089
01-23-2016, 07:29 AM
16. Seeking help with a condition probability question

Hello, I have measurements of 3 variables (1) Journey start time (2) Distance travelled (3) Journey Time. I am looking to work out the...

• Replies: 0
• Views: 1,206
06-22-2012, 05:48 AM
17. Markov chain transition probability matrix

Hi there, I'm trying to understand markov chains and transition probability matrices. I have a recording of time (1, 2,, 3 second etc), velocity...

• Replies: 1
• Views: 3,020
08-16-2011, 12:00 PM
18. Combining 2 transitional probability matrices?

Hello, How would you/or is it possible to combine two transitional probability matrices? Say for example I have 2 matrices that both measure...

• Replies: 7
• Views: 2,125
02-22-2012, 07:21 AM
19. States of a Transition probability matrix

Hi there, I have a question about the states on a Markov chain that I was hoping some one might be able to explain to me. Say for instance...

• Replies: 0
• Views: 3,293
02-06-2012, 11:48 AM
20. States of a Markov Chain question?

Hello all, I would be grateful if somebody could advise me or comment on a Markoc Chain question that I have. It is with regards to the state...

• Replies: 0
• Views: 1,347
02-21-2012, 07:36 AM
21. Transform random variables to uniforms using their CDF

Hello, I researching the Joint Normal Transform methodology. I only have a basic statistics. How would you transform a random variable to its...

• Replies: 2
• Views: 2,315
12-11-2013, 07:09 PM
22. modelling departure time probability on consecutive days with copula function

Hello, I have data of the departure and arrival time of cars from their home. These stochastic variables are modelled using a normal copula...

• Replies: 0
• Views: 1,546
05-17-2012, 11:46 AM
23. Using a copula function when one of the correlations is not significant

Hello, I have 4 variables: 1. Departure Time from Home 2. Distance travelled during the day 3. The number of trips made during the day 4....

• Replies: 4
• Views: 2,368
06-05-2012, 04:07 AM
24. How to generate a certain number of random numbers from a gamma distribution that sum

Hello, Would anybody be able to advise me or tell me how you could generate a certain number of random numbers from a gamma distribution that sum...

• Replies: 1
• Views: 2,050
06-21-2012, 05:57 PM
25. Conditional probability Question

Hello, I'm trying to work out a conditional probability. I have two measurements of two variables (1) Start Time and (2) Distance. I've...

• Replies: 1
• Views: 1,350
BGM
06-22-2012, 10:31 AM
26. Determining the probability of an electric car charging station being available?

Hi there, I'm just wondering if anybody would know of a way of determining the probability of an event. I trying to figure out how I could...

• Replies: 0
• Views: 1,025
06-27-2012, 09:29 AM
27. Stick breaking constriction probability

Hi Guys, Could I ask a question with regards to probability theory? I have recorded some journey distances for cars. Here is an example. The...

• Replies: 0
• Views: 1,403
07-24-2012, 08:02 AM
28. Conditional probability Question

Hi Guys, Could I ask a question with regards to probability theory? I have recorded some journey distances for cars. Here is an example. The...

• Replies: 1
• Views: 1,249
07-26-2012, 01:35 PM
29. Question about a monte carlo simulation of car travel patterns

Hi there, I have a question about probability, conditional expectations, copula functions and their use in a Monte carlo simulation. I'd...

• Replies: 0
• Views: 1,228
09-12-2012, 08:13 AM
30. Conditional probability question

Hi there, I have the journey times of 2 journeys. Would somebody be able to show me by way of example how to calculate the conditional...

• Replies: 0
• Views: 983
09-18-2012, 09:26 AM
31. Bayesian probability question about Dirichlet prior distributions

Hi there, I have a question about Bayesian probability. I have a list of the starting times of journeys. I binned the data into 15 minute...

• Replies: 2
• Views: 1,704
10-16-2012, 03:38 AM
32. continuous and discrete variables with a copula?

Hi, I have 3 correlated variables that I wish to model with a copula function. 2 of the variables are continuous and 1 is discrete. My...

• Replies: 1
• Views: 1,975
BGM
11-02-2012, 10:29 PM
33. 1st order or 2nd order distribution

Hi, I'm fitting a distribution to the starting times of the first car journey in the day. I have a sample of 3,000 journey starting times. I am...

• Replies: 0
• Views: 2,087
11-03-2012, 08:55 AM
34. Probability of journey times

Hello, If you assume that the average speed of car will be 30km/hr when making a journey. A journey distance is 10 km. You therefore...

• Replies: 3
• Views: 1,668
11-16-2012, 11:17 AM
35. Q-Q plot equivalent for discrete variable?

Hello, You can use a Q-Q plot to visually test if 2 continuous variables are from the same distribution and you get a straight line. Is there...

• Replies: 0
• Views: 2,360
12-04-2012, 08:05 AM
36. quantify difference between discrete distributions

Hello, I am trying to quantify the difference between two discrete distributions. I have been reading online and there seems to be a few...

• Replies: 0
• Views: 1,589
02-14-2013, 09:49 AM
37. Probability of electric car recharging

Hi, I'm reading a paper which calculates the probability of an electric car re-charging. Data has been recorded from a car. There are 2 types of...

• Replies: 4
• Views: 1,159
03-01-2013, 10:19 AM
38. two-sample Kolmogorov-Smirnov test

Hello, Hello, I have recorded some discrete data with an unspecified distribution. I have generated some discrete data from a model. I'm...

• Replies: 0
• Views: 795
02-08-2013, 08:54 AM
39. simple probability question

Hello, I have a simple probability question that I was hoping somebody could answer. If I know that the probability that a charging point is...

• Replies: 2
• Views: 1,867
04-04-2013, 01:33 PM
40. Simulating a probability, use a random number?

Hello, I looking for some advice for a simulation. I know that when an electric car arrives at a destination there is a 70% chance that a...

• Replies: 3
• Views: 1,139
03-09-2013, 01:13 PM
41. variance of product

hi, i try to prove this property. Verify that: Var=Var.Var +Var.E^2+ Var.E^2 X,Y are independent variables. i tried the definition of variance...

• Replies: 1
• Views: 2,206
01-27-2012, 10:17 AM
42. Probability and Efficiency

I have a probability question I am looking for some help with. In the scenario I perform a task on an object. I will either succeed or fail....

• Replies: 0
• Views: 1,191
04-13-2016, 10:31 AM
43. Expected value

I can't figure out how to set this up. The compilation of data is boggling my mind. Do i use the 0,1,2,3,4,5,6,7,8,9 to figure my probabilities? ...

• Replies: 4
• Views: 4,351
01-25-2017, 09:31 PM
44. Normal distribution? Probability? What?! Help, please! D:

I'm doing a sample test for a Stats quiz I have on Tuesday and I've run into a question that I just cannot get. :confused: I'm sure the method to use...

• Replies: 2
• Views: 3,821
02-25-2010, 04:36 PM
45. probability question

This is probably going to seem so easy to most of you but I cannot remember how to do this problem. In one town 64% of adults have health...

• Replies: 2
• Views: 2,038
06-18-2008, 12:07 AM
46. expectation problem

10 balls are inserted (uniformly) into five jars ..each insertion is independent from the others. compute E(X1*X2) where X1 and X2 describes the...

• Replies: 3
• Views: 3,583
01-21-2012, 08:58 AM
47. Request: Exams(CS109)

hi, im studying for an exam in Introduction for Probability to CS.. does anyone have past exams of CS109 from Stanford/ similiar courses at...

• Replies: 2
• Views: 2,825
02-14-2012, 07:09 PM
48. Distributions

shuffle a deck of 52 cards turn over one top card until you reach the first ACE. find the E(X).

• Replies: 1
• Views: 2,295
04-16-2009, 07:59 PM
49. Maximum probability in a grid

Hi, this is my first post, so hello! My problem (and my question) is how can I either express the probabilities calculated below as the...

• Replies: 0
• Views: 2,044
12-21-2015, 06:04 AM
50. Issues with Probability Mass Function

Hello, could someone please provide guidance with this question? (a) Let X be the maximum value when two cards are randomly selected from a deck...

• Replies: 3
• Views: 4,521
BGM
06-21-2011, 09:05 AM
51. Excel Simulation (Monte Carlo) help

Hi all, I've been racking my non-statistical brain on my Excel simulation (monte carlo sim predicts profit). I have created the model and as I...

• Replies: 3
• Views: 2,217
03-01-2016, 10:20 PM
52. bayesian

• Replies: 5
• Views: 3,262
01-16-2009, 12:52 AM
53. Card Pairs Problem with a Twist (TV Gameshow)

Hi I'm working out a solution for a TV gameshow which leads me to a problem... I'd like to know the probability of finding a pair of cards in the...

• Replies: 0
• Views: 1,531
05-03-2012, 04:50 AM
54. simple probability question

So i just wrote a test and i answered this question as 50% tell me if i am right supposed 50% of all students in the world read newspaper. 5...

• Replies: 2
• Views: 980
02-06-2013, 07:59 PM
55. need help with a handful of question

Hello.. I just found this site and I was wondering if you guys could help me. I've never been very good at stats and I've been working on questions...

• Replies: 3
• Views: 2,579
01-28-2007, 11:48 AM
56. probaliblity question

a producer of a fruit drink advertises it contains 10% real fruit juices. A sample of 75 bottles are analyzed and it's found that only 6.6% is real...

• Replies: 1
• Views: 2,263
01-28-2007, 04:27 PM
57. 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: 2,574
07-28-2014, 08:40 AM
58. Need help with this problem asap

1. The average number of calls received by a switchboard in a 30-minute period is 15. What is the probability that between 10:00 and 10:30 the...

• Replies: 0
• Views: 4,534
03-30-2008, 08:44 PM
59. Really Easy Question

This is a basic question about probabilities, specifically what kind of test to use. I think I am close to an answer, but I am not sure. The idea...

• Replies: 0
• Views: 2,828
10-24-2007, 12:24 AM

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