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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: 30,371
09-30-2005, 09:44 AM
1. ### Resolution of your sample size and Confidence Intervals

I'm look for some generalized guidance. Let's say I have 200 stores. I test 10 of these for a month doing some sort of specialized promotion. I...

• Replies: 0
• Views: 1,457
12-13-2013, 07:30 PM
2. ### Coin Flip and calling randomly

If there is a coin flip contest and there is a coin flipper continuously flipping the coin and there are three contestants 1. Always Calls Heads...

• Replies: 5
• Views: 1,611
03-10-2014, 08:47 AM
3. ### Calculating a stochastic matrix with multiple states

I am struggling with how to calculate the values of a Markov matrix which has multiple states. For example, Imagine an unfair 6 sided dice. The...

• Replies: 1
• Views: 1,183
BGM
07-14-2015, 11:02 AM
4. ### Exam Question Probability.

Pretty straightforward question, I just want to double check what I told a friend. She has 11 exam questions to study for, only 6 of these will be...

• Replies: 3
• Views: 5,207
06-20-2008, 01:36 AM
5. ### introduction to stochastic process by by Hoel, Port and Stone.

those any one have this text. i have gone through all the questions in chapter 1 except for two prove questions. no 27 and 26 i am lost

• Replies: 6
• Views: 13,180
07-16-2010, 02:05 PM
6. ### UK Sports Sweepstake Question

Hi, my friends have been having many conversations on the following subject and can't seem to find an answer anywhere and now we have a little...

• Replies: 2
• Views: 3,790
01-17-2010, 10:39 AM
7. ### Apartment vacancy question

My friend is in this exact situation and we are having trouble figuring out the probability - please help! She is looking for a top-floor...

• Replies: 2
• Views: 1,292
12-19-2013, 05:52 PM
8. ### Stats question: random balls

There is a pool of 4500 unique balls. There are 3 people, called X, Y and Z, who are blindfolded. They take turns to take out as many balls as they...

• Replies: 3
• Views: 3,603
09-03-2009, 07:22 PM
9. ### Lottery Draft Question

Hi! I'm trying to figure out the odds of each team getting each pick in our NHL fantasy league lottery draft. It is somewhat modeled after the...

• Replies: 1
• Views: 3,139
BGM
03-01-2012, 02:08 AM
10. ### How can I estimate the traffic

Hi, I'm trying to make some computer system load estimations, but I'm not sure I have all the data I need for that. I have a machine that will...

• Replies: 1
• Views: 2,679
02-16-2009, 10:14 AM
11. ### how many combinations ?

4 numbers with each can be from 1 to 49. e.g. 1,2,3,4 1,2,3,5 1,2,3,6 1,2,3,7 but exclude depublication that is 2,1,3,4 or...

• Replies: 4
• Views: 3,965
01-29-2009, 10:02 PM
12. ### Probability - Law of multiplication?

I'm reading about probability and encountered this problem: http://imgur.com/6xTM9Z1 (I guess the answer of a is 1-0,37=0,63 which is the...

• Replies: 0
• Views: 1,079
11-12-2014, 10:07 AM
13. ### PDF and Mean

I have a couple of question here I can't figure out. Does anyone know how to prove these? And can you explain why? Find the probability density...

• Replies: 1
• Views: 2,446
heD
01-31-2006, 11:22 PM
14. ### MLE of range of Uniform(a,b)

So, I want an MLE for (b - a). log L(a,b|x) = -n log (b - a) given a < x_(1) and b > x_(n) but d/da log L gives me n/(b-a) >, and in fact =/=...

• Replies: 9
• Views: 10,947
03-17-2011, 12:13 PM
15. ### (What may be) A beginner problem!

Just as a disclaimer, I have never taken a probability or stats course, so please excuse me for not being up to snuff around here. Anyhow, for my CS...

• Replies: 0
• Views: 1,510
04-25-2013, 11:08 AM
16. ### Gamma/poisson distribution

Suppose that ‘serious’ road accidents happen on a regional road in accordance with a Poisson process with a rate of 2.3 per week. Let T1 be the...

• Replies: 1
• Views: 6,275
BGM
05-25-2010, 08:36 AM
17. ### Poisson distribution

The number of cars that pass Bill's house between 8.00am and 9.00am on a normal week day follows a poisson process with rate 6 cars every 5 minutes....

• Replies: 2
• Views: 3,421
08-03-2010, 10:13 AM
18. ### True or false?

Is this statement true or false? The central limit theorem says that, as n tends to infinity the distribution of (Y - E(Y))/Standard deviation...

• Replies: 10
• Views: 5,338
08-24-2010, 11:26 PM
19. ### Probabilty of picking higher number

I am working on a webbased game, and need help with some probability. Player A rolls a 20 sided die with the numbers 1 through 20. Player B rolls...

• Replies: 12
• Views: 3,555
08-28-2008, 12:02 AM

a fair six sided die is rolled 5 times and the number of 6's are counted. find n and p. Find the probability of exactly two 6's. I know that n=5...

• Replies: 2
• Views: 3,626
11-17-2009, 09:49 PM
21. ### *Rate of Ruin & Optimal N

For a fair coin toss game, both prob(ruin) & prob(consecutive losses) increases with no. of trials. Is the Rate of ruin .i.e.where prob(ruin)...

• Replies: 13
• Views: 3,894
11-28-2011, 12:21 PM
22. ### What is the number of combinations for a 6XN combination lock?

Hi, does anyone know how to calculate the total number of combinations a 6XN combination lock .i.e. each of the 6 wheel columns has N possible...

• Replies: 5
• Views: 1,915
12-26-2011, 02:02 PM
23. ### Fano plane concept applied to lottery combinatorics

I came across an interesting combinatorics optimisation description for 14numbers. Maybe someone good in combinatorics can expand this fano plane...

• Replies: 2
• Views: 2,489
03-30-2012, 12:58 PM
24. ### Roulette probability

I am really struggling with this.... any help will be greatly appreciated Consider the following three methods of betting reds on a roulette...

• Replies: 1
• Views: 1,937
11-28-2012, 09:08 PM
25. ### Calculating special lottery odds

#s out of a bag! Hello, I would appreciate anyone's help in this problem: There are 11 balls in a bag numbered 0-10. You get 6 picks out of...

• Replies: 4
• Views: 1,327
BGM
11-24-2015, 12:54 AM
26. ### Probability problem

Find the conditional probalilities of the indicated events when two fair dice (one red and one green) are rolled: The sum is 6, given that the...

• Replies: 5
• Views: 6,733
10-02-2011, 05:12 PM
27. ### Dice Probability (2d6, 3d6, 4d6)

I would like to find the probabilities of rolling a result using different numbers of six-sided dice. I am looking for the best way to figure out the...

• Replies: 2
• Views: 6,025
BGM
05-10-2014, 12:50 AM
28. ### HW help

I have a probelm with one of my hw questions which is: A sample from a normal population has a standard deviation of 0.02. What is the...

• Replies: 0
• Views: 2,743
10-09-2008, 02:28 PM
29. ### Conditional ev,big problem with definition

I jus dont seem to understand this concept "conditional e.v." I do know the definitions: joint density f_X,Y , conditional density of X given Y=y,...

• Replies: 3
• Views: 3,114
BGM
08-28-2010, 12:26 PM
30. ### Trying to predict a trend

The chart below displays what percentage of bankruptcies are filed each year, by region, due to medical costs. If I'm trying to predict how many...

• Replies: 1
• Views: 3,499
04-28-2009, 09:06 PM
31. ### Probabilities in a 7-game series

This probably isn't relevant, but this is not homework help. I'm just a curious adult who hasn't taken a stastics class in a few years so I'm pretty...

• Replies: 3
• Views: 5,109
01-11-2012, 03:36 PM
32. ### Joint distribution question

Let X and Y be independent random variables with an exponential distribution with parameters µ and λ (note that the exponential distribution is given...

• Replies: 0
• Views: 2,825
11-09-2007, 01:40 PM
33. ### Generating function

Hi, I'm stuck on this problem. If anyone could help, it would be really appreciated! Find the generating function for the negative binomial...

• Replies: 0
• Views: 2,481
10-19-2007, 08:21 PM
34. ### 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: 1,865
06-10-2014, 07:16 AM
35. ### Probability Scenario

Here’s the scenario: A committee of 9 people is deciding which 5 people of 14 candidates should be hired for a job. In order to be hired, a...

• Replies: 4
• Views: 1,755
02-25-2016, 07:02 PM
36. ### How to get this Z value?

P<=.667 Z.667 = .432 My question is how to get .432 by using the cumulative normal probability table(z-values). Thanks for your help,...

• Replies: 1
• Views: 2,293
05-05-2007, 03:16 PM
37. ### Trying to calculate confidence intervals

Hi everyone. The numbers below are the annual maintenance costs of a program I am working on. I'd like to use the data set to estimate future costs...

• Replies: 2
• Views: 2,004
07-08-2015, 10:02 AM
38. ### Expectd Value for ranges

I hope someone can help me with this expected value question: Total Number of Admissions/Probability 950,000 to 1,050,000/ ...

• Replies: 2
• Views: 2,690
02-03-2009, 02:34 PM
39. ### Bayes' Theorem applied to poker?

• Replies: 1
• Views: 1,875
06-01-2014, 11:00 AM
40. ### Normality of predictors - negative binomial regression

Hi guys, As a part of my current research project I'm conducting a sequence of negative binomial regressions with counts of crime offences from...

• Replies: 2
• Views: 5,040
03-06-2009, 09:02 PM
41. ### U.S. diversity index problem

Hi, everyone. I'm having a little bit of trouble with this problem: The U.S. Census measures the diversity of a population by calculating a...

• Replies: 2
• Views: 3,143
01-19-2009, 07:13 PM
42. ### How do you multiply a probability times a probability?

Just a non-math guy needing help from some math guys so I can finish an article for a magazine! I know it's easy to do, I just don't know how. ...

• Replies: 10
• Views: 5,360
01-20-2010, 01:05 PM
43. ### How do I add percentages?

For instance, let's say a person is a truck driver and there's an: 80% chance of they smoke 40% chance of they are overweight 60% chance of they...

• Replies: 4
• Views: 8,008
05-03-2010, 11:15 AM
44. ### Poisson Question

I'm not a stat guy by any means, so I want to check my thinking here. Let's say a football player scored 11 Touchdowns in 16 games for an average...

• Replies: 7
• Views: 2,689
06-01-2011, 07:02 PM
45. ### Help me please (homework)

-Suppose a measurement of A has been made over a large population -5% of those population are positive for A -if A is measured on the same subject...

• Replies: 1
• Views: 2,460
10-03-2007, 05:23 AM
46. ### Help me please.. (expected value) Thanks

Suppose that 20 percent of the students who took a certain test were from school A and the average of their scores on the test was 65. Also,...

• Replies: 1
• Views: 2,847
02-16-2008, 03:51 PM
47. ### Poisson Distribution

Can anyone help me with this poisson question The number of spelling errors per 1000 words made by a typist has a Poisson distribution with a mean...

• Replies: 3
• Views: 2,896
03-27-2006, 01:32 PM
48. ### binomial distribution question

A currier service receives parcels and forwards them to their destination. The aim is to forward all parcels within 24 hours but is not always...

• Replies: 1
• Views: 2,736
03-28-2006, 04:13 PM
49. ### Validity of setting constant to zero

Can anyone tell me the validity of setting the constant term to zero to make the other coefficients pass significance? I have been sent a multiple...

• Replies: 3
• Views: 8,402
05-13-2009, 05:32 PM
50. ### need help with these 2 questions

a) Profits (denoted as X) 100 normally distributed mean value of 1.5 mi and a (s.d.) of 120,000. Calculate P (X < \$1 million) -4.66 is that...

• Replies: 3
• Views: 3,202
06-17-2008, 11:46 AM
51. ### 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: 1,379
10-21-2014, 05:36 AM
52. ### Corrected significance level in Tukey HSD post-hocs?

Dear all, I have a question that is really bugging me: I'm testing if seed set in one plant species is impacted by the deposition of pollen...

• Replies: 1
• Views: 4,109
10-28-2007, 06:31 PM
53. ### Pie slices

Hi all, I would like to know what the probability distribution for the number of pie slices could be. Or the stochastic process behind slicing....

• Replies: 0
• Views: 1,944
09-17-2006, 12:53 PM
54. ### Conditional Probability question

okay the problem statement is as follows A gene can be either type A or type B (ie note type A). A gene can also be either dominant or regressive....

• Replies: 3
• Views: 2,538
DAV
10-09-2008, 11:21 AM
55. ### 15 people (including you) apply for 7 jobs. What are your chances of getting the job?

Hi :wave: Allow me to extend my thanks to you all for taking the time to visit this thread. I came across this seemingly simple probability...

• Replies: 16
• Views: 7,262
12-30-2011, 02:39 PM
56. ### probability generating function

Hi All, I'm new to the forum. I'm trying to learn a bit of statistics on my own (as a pastime) but I'm stuck with this problem: I have two...

• Replies: 0
• Views: 3,068
01-05-2008, 10:01 AM
57. ### Simple Set THeory/Probability Problem

Hello all, I'm very new to statistics as well as this forum, so please bear with me. I've tried solving this for about 30 minutes now and I've...

• Replies: 4
• Views: 257
09-20-2017, 02:16 PM

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