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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: 30,288
09-30-2005, 09:44 AM
1. ### Coin flipping

A coin is weighted so chances of heads is 0.60 and the chances of tails is 0.40. The coin's tossed six times and the the number of heads out of six...

• Replies: 1
• Views: 3,242
06-02-2008, 03:11 AM
2. ### coin toss

I have a coin that lands heads with probability p1; you have a coin that lands heads with probability p2. I toss my coin until I get a head. Each...

• Replies: 8
• Views: 3,442
02-26-2012, 05:35 AM
3. ### Coin Toss

Hi, There are three people, A, B ,C, tossing a coin. The first one to get heads wins, they toss in succession in the order ABC, show the...

• Replies: 5
• Views: 2,322
plm
11-17-2013, 11:54 AM
4. ### Coin toss question

How about a hint about how to approach the following problem. If you toss a fair coin X number of times, what would be the probability that the...

• Replies: 10
• Views: 3,448
BGM
09-28-2011, 03:45 PM
5. ### Collect answers and determine probability

Hello! I'm trying to figure out a method to predict the most probable answer taking into account previous answers collected in a database. ...

• Replies: 0
• Views: 1,302
03-22-2012, 12:10 PM
6. ### collect sales taxes on items purchased through the internet

Many states are carefully considering steps that would help them collect sales taxes on items purchased through the internet. How many randomly...

• Replies: 0
• Views: 5,424
12-06-2007, 03:58 PM
7. ### College Football Bowl Pick'em Pool Probability

I'm creating an excel spreadsheet for our office pool. If you're not familiar with the College Bowl Pick'em game, the rules are as follows... ...

• Replies: 2
• Views: 2,519
11-21-2015, 10:47 AM
8. ### College Smokers

This is a proportion of a sampling distribution from what I can tell: I have thought and thought on how to finish this problem. I have read my...

• Replies: 2
• Views: 2,044
09-07-2013, 02:05 AM

Dear All Please give your attention to following and help. There are white(9/16) and black(7/16) balls in box with probabilities...

• Replies: 2
• Views: 1,795
08-02-2012, 08:05 AM
10. ### Combination and Permutation question

Hi guys, I'm new to the field of probability and statistics, I have a question that I can't seem to be able to solve, it would be a great help if you...

• Replies: 2
• Views: 1,457
11-20-2014, 11:03 PM
11. ### Combination of families of fragility curves (cumulative probability functions)

Hi guys, I am a geotechnical engineer and currently involved in a project for risk calculation of an embankment dam. It's my first post here, I am...

• Replies: 0
• Views: 1,568
05-11-2015, 09:42 AM
12. ### Combination permutation

Suppose that from a class of students (of whom 14 are male and 16 are female), a committee of 10 students is chosen at random. The committee then...

• Replies: 0
• Views: 3,276
12-08-2010, 11:23 AM
13. ### Combination probability of variables that are not independent

Hello, I'm hoping I might be able to get some help in creating a forecasting model (in sports) looking at 2 variables that are not independent of...

• Replies: 0
• Views: 1,205
03-02-2013, 08:39 PM
14. ### Combination Problem

I've been banging away at this... and I think I'm close, but would really appreciate someone looking over my shoulder... here goes: - 13 students...

• Replies: 0
• Views: 2,131
12-30-2008, 12:17 PM
15. ### Combination question

Hey, kind of stumped on this and hopefully someone can point me in the right direction. A company is looking at events over N years. A person can...

• Replies: 1
• Views: 1,694
BGM
01-24-2013, 01:06 PM
16. ### Combination question...

A combination lock has a total of 4 rows of numbers(0-9) and will unlock with the proper 3 - number sequence. How many possible combinations exist?...

• Replies: 1
• Views: 2,510
03-20-2006, 11:44 AM

-Resolved- Thanks

• Replies: 1
• Views: 1,632
07-07-2012, 07:07 PM
18. ### Combination/Permutation???

Ok here is the problem I have four m\$ms and three friends How many ways can i divide the m&ms considering i can give each friend 0, 1, 2, 3 or...

• Replies: 1
• Views: 4,253
11-15-2007, 10:15 PM
19. ### Combinational problem

This homework problem has me stumped. I have a pretty logical result b/c I think I use all of the 5 credits needed. The problem states, A video...

• Replies: 3
• Views: 1,933
02-01-2013, 12:39 AM
20. ### combinations and permutations

hi all, can you all help me wif this question? 1. an art collector, who owns 10 paintings, is preparing her will. how many different ways can...

• Replies: 3
• Views: 3,347
10-13-2009, 12:28 PM
21. ### combinations question

At a recent faculty party there were 8 philosophers, 5 psychologists, and 6 physicists, all noted for their love of the (fermented) grape (and...

• Replies: 1
• Views: 1,422
BGM
12-12-2012, 03:47 AM
22. ### Combinations question

I have a strange question I hope someone can explain it to me or tell me if there is some type of statistical definition for this process im trying...

• Replies: 6
• Views: 1,625
02-10-2015, 10:09 PM
23. ### combinations/permutations

It's for Finite Math and we're dealing with combinations, permutations, and all that good stuff. Here we go: Suppose there are 3 U.S....

• Replies: 0
• Views: 2,674
10-26-2007, 03:29 AM
24. ### Combinatorial Analysis HW Help

There are 100 U.S Senators, two from each of the 50 States. If 12 Senators are randomly chosen to form a committee, what is the probabilty that...

• Replies: 0
• Views: 1,518
02-08-2015, 12:36 AM
25. ### Combinatorices

Hello, I have a small question please... In a building there are 8 floors, in each floor, there are 4 flats. In each flat lives a couple ( man &...

• Replies: 1
• Views: 2,741
07-22-2009, 03:53 PM
26. ### Combinatorics

Hey guys. I really struggle with combinatorics/permutations... It seems like I can't possibly translate a verbal question onto math. This mainly...

• Replies: 1
• Views: 1,860
BGM
07-24-2013, 06:26 AM
27. ### Combinatorics + Statistics Question

I have a homework question to find the probability that a permutation of 1000 symbols has between 432 and 789 cycles. X is a random variable denoting...

• Replies: 0
• Views: 2,082
03-22-2009, 11:49 AM
28. ### combinatorics ...

Hey guys here's my confusion, any help clearing it up would be wonderful ... :) Let's say you've got 2 * 6-sided dice The sample space is 6^2 =...

• Replies: 2
• Views: 1,560
07-22-2012, 11:21 PM
29. ### Combinatorics / Conditional Independence problems

Every year, 6 Irish families, represented by 4 members each, meet up and rent 3 minivans of 8 seats each to go to a big festival. In order to mix...

• Replies: 0
• Views: 1,332
10-30-2014, 02:14 AM
30. ### Combine Normal Distributions

How do you combine multiple normal distributions with different standard deviations and means, to produce one representative normal distribution? ...

• Replies: 12
• Views: 20,768
01-26-2013, 12:51 AM
31. ### Combined probabilities

Hi all! I have a pretty interesting problem that I was hoping someone here could help me with. I am designing an application where a given user...

• Replies: 0
• Views: 2,788
07-24-2009, 11:59 PM
32. ### combining 2 probabilities

I have a problem, its not a homework problem so I hope its ok for me to post here. I have calculated the probability that team A wont score a...

• Replies: 2
• Views: 2,903
11-23-2010, 07:23 AM
33. ### 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: 2,116
02-22-2012, 07:21 AM
34. ### Combining Bernoulli distributions

I'm looking for a way to find the standard deviation of a certain distribution. This distribution is created by performing n_0 Bernoulli trials with...

• Replies: 4
• Views: 1,682
07-18-2012, 03:20 PM
35. ### Combining multiple probabilities

Hi, Is it possible to add two or more probabilities together to get an overall probability? For example: There is a dichotomous outcome, let's...

• Replies: 1
• Views: 2,553
BGM
07-21-2011, 06:43 AM
36. ### Combining pdf's for when a task will stop

Hello, I have multiple tasks I want to run in succession, and I need to know at a given time what is the probability that they will both be done....

• Replies: 2
• Views: 2,094
12-20-2010, 06:27 PM
37. ### Combining properties of expected values and variances

Hi! First post here so cut me a bit of slack Hopefully an easy topic too (I'm new to stats). If I have some values for E(X) (e.g. 5min) and...

• Replies: 1
• Views: 1,816
04-21-2013, 02:13 PM
38. ### Combining random variables, squared

Been sitting with this for a while, and hoping wome of you can assist me. I'm given a pdf f(y) = 6y(1-y) for 0<y<1, and I want to calculate the pdf...

• Replies: 2
• Views: 6,276
03-11-2010, 12:45 PM
39. ### Combining standard deviation/normal distribution (do I have this right?)

I have a variable with a mean of 52% and a standard deviation of 2.5%. However, the 52% mean was derived from an opinion poll which itself has a 3%...

• Replies: 0
• Views: 1,421
11-16-2012, 11:28 AM
40. ### Combining two data sets using Bayesian methods

Hi, I want to combine multiple data sets of customer spend data together. I want to calculate how the bounds of the data decrease as I add in more...

• Replies: 0
• Views: 872
02-02-2016, 11:18 PM
41. ### Combining two different normal distributions.

I have done the following question: In a hospital, 1/3 of the people who use a particular elevator are adults and 2/3 are children. The weight of...

• Replies: 10
• Views: 15,842
11-23-2010, 10:41 PM
42. ### Combining two normal distrubtions, 1 of which is for a project which may not happen

Hello, I have to 2 projects: Project A: Median: \$450k, Variance: 625 Project B: Median: \$750k, Variance: 1250 Combined Freqency Distribution:...

• Replies: 2
• Views: 1,278
BGM
03-30-2015, 06:33 AM
43. ### Combining two sources of uncertainty

I will use an imperfect dice for simplicity. Let's assume there are two factors that influence the probability of the results obtained from throwing...

• Replies: 2
• Views: 191
10-08-2017, 03:51 PM
44. ### Cominatorics Question ~ How many equations can be written with n variables?

Hi everyone, currently I am doing a thesis paper. I have currently 7 variables I need to write in terms of the others to satisfy some homogeneity...

• Replies: 2
• Views: 1,733
04-20-2012, 03:21 PM
45. ### Committee

5 member group A-E What is the Probability of drawing 3 slips from a hat randomly , the committee contains A but not B ? to make up a 3 person...

• Replies: 1
• Views: 2,241
09-27-2007, 03:37 PM
46. ### 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: 2,065
10-21-2014, 03:20 PM
47. ### Comparing 2 choice simulations

Hello there, I am stumped with a conceptual problem, for which I am sure there is a very simple solution. There are 2 computer models of...

• Replies: 1
• Views: 2,722
04-14-2008, 07:03 PM
48. ### Comparing 2 continuous uniform distributions

I have what appears to be a very simple problem, but am having difficulties working out a solution. Any help would be much appreciated. The...

• Replies: 1
• Views: 3,046
BGM
02-09-2012, 02:02 PM
49. ### Comparing and balancing two outcome-production methods

Hi, I've a question. :) I have a soccer videogame where teams have different strengths (16 to 621). The result of a match between two teams can be...

• Replies: 1
• Views: 1,497
11-03-2013, 04:06 AM
50. ### Comparing CDFs using Chi squared?

HI, I have a set of data from which I can construct the cumulative distribution function. I then compare this contructed CDF with the CDFs of a...

• Replies: 3
• Views: 4,630
07-10-2008, 07:44 AM
51. ### Comparing conditional probabilities?

I have 250 respondents. They’ve reported their participation in three different kinds of political activities: reading about politics on line,...

• Replies: 2
• Views: 2,878
07-17-2008, 08:22 PM
52. ### Comparing Gaussian curves

Hi, I have two points A(30.333,100) and B(30.333151665,80) I need to draw Gaussian for each point separately and need to check their overlap...

• Replies: 7
• Views: 9,147
08-31-2011, 05:35 PM
53. ### Comparing probability distributions over discrete random variables

Hi guys Sorry if the post is not in the right place but I am new here. I am comparing the performance of two monte carlo methods. The results I...

• Replies: 0
• Views: 2,989
05-08-2011, 07:38 AM
54. ### 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: 1,028
09-21-2014, 01:35 PM
55. ### Comparing the skewness of two smaple distributions

Hi Everyone, I wonder if anyone can help me here. Suppose I have two samples with, say, 100 observations in each, and I am not sure if the...

• Replies: 1
• Views: 3,756
01-04-2011, 10:05 AM
56. ### comparing two Poissonians

What is the proper statistical test for the following: I know A1 and A2 to be Poisson distributed with (unknown) means x1 and x2. I have a single...

• Replies: 20
• Views: 5,880
06-23-2010, 12:36 PM

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