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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: 30,390
09-30-2005, 09:44 AM
1. ### Birthday problem

ignore this, I have solved the problem

• Replies: 0
• Views: 2,465
11-25-2006, 12:52 AM
2. ### Uniform Variable

Can someone please help with the below problem? Derive the probability density function of X=U^2, where U is uniform on (0,1) Where do I even...

• Replies: 1
• Views: 2,465
10-26-2008, 05:29 PM
3. ### Probability of the sample Mean

The weight (x) of an adult salmon in Lake Michigan is a normally distributed variable with the mean 5.5 lbs and a standard deviation of 0.5 lbs. An...

• Replies: 0
• Views: 2,465
12-07-2010, 06:11 PM
4. ### [Question] Birthday Problem

Here is the problem, I already get the answer, \frac{r}{365 -365(\frac{364}{365})^s} What do you think?

• Replies: 1
• Views: 2,465
10-26-2011, 12:04 PM
5. ### Numerical frequency analysis query

Hi, I heard about this on radio 4 (UK) back in 2007. A statistical method whereby the frequency of integers in a dataset is calculated, then...

• Replies: 0
• Views: 2,464
03-08-2010, 07:52 AM

I have this question that I believe I have the correct answer for, however, I am unsure as to exactly what the proper formula is (and obviously...

• Replies: 6
• Views: 2,464
01-27-2012, 09:01 PM
7. ### can anyone help on this one?

Given two i.i.d uniform random points x and y on the interval , what is the average size of the smallest of the three resulting intervals?

• Replies: 4
• Views: 2,463
09-11-2010, 10:04 AM
8. ### Probability HW

Hi, I need some help figuring out the inclusion probability. Here is the problem: Unequal probability sampling is often unavoidable, so it is...

• Replies: 0
• Views: 2,463
10-13-2010, 07:42 PM
9. ### 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: 2,463
06-19-2013, 02:47 PM
10. ### Average Probablities over a quarter

Hi all, I have the following probability data for a medical event, I need to find what was the overall probability for these three month? 1-...

• Replies: 1
• Views: 2,463
10-31-2016, 01:48 PM
11. ### 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: 2,462
10-03-2007, 05:23 AM
12. ### Permutation probability

Hi all, I am trying to find the probability of the permutation of correlated random variables. The problem is: Let X_i be correlated normal...

• Replies: 2
• Views: 2,461
06-15-2010, 06:49 AM
13. ### Relating Type I and Type II Error to C-charts

Hello, I am trying to figure out how to relate type I and type II error calcuations to c-charts. Ive already calculated the 3 sigma control...

• Replies: 9
• Views: 2,461
04-21-2014, 03:25 PM
14. ### Basketball shooting percentage - binomial distribution?

I am interested in studying the probability of team field goal percentage being unusually high. In context, I recently watched a women's college...

• Replies: 3
• Views: 2,461
02-15-2015, 11:59 AM
15. ### Travelling

Hi, Still on my quest to sort probabilities problems involving time, I was trying to get help on this: If my car is traveling at 100 km / h in...

• Replies: 2
• Views: 2,461
10-07-2016, 01:36 AM
16. ### SAMPLING DISTRIBUTIONS - I tried to answer the question please check my work!*!*!*!*!

There was no help, and I don't want to give away my work when nobody offers any help to me.

• Replies: 1
• Views: 2,459
02-01-2008, 03:58 PM
17. ### the oldest 100

I’m studying activity (number of posts) for the first 100 users on an social network. It is skewness distribution. I am trying to find out if there...

• Replies: 2
• Views: 2,459
09-01-2010, 02:26 PM
18. ### change of variable help

1. Let X~Geometric(1/4), and let Y have probability function: pY(y)= 1/6 if y=2 1/12 if y=5 3/4 if y=9 0 otherwise Let W=X+Y. Suppose X and...

• Replies: 1
• Views: 2,459
11-01-2010, 07:53 PM
19. ### Help on Stats Assignment!

hey guys, In the town of Dumparonster it is well known that garbage must be out by 8am each Monday morning and that each house in the town has a...

• Replies: 2
• Views: 2,458
02-12-2009, 12:19 PM
20. ### Help On Probablity Immediatly

For a particular brand of popcorn in an air popper, the average number of kernels that fail to pop is 6.8 per cup. a.) Find the probability that 5...

• Replies: 1
• Views: 2,457
03-17-2008, 09:20 PM
21. ### Statistical significance for discrete data?

I'm getting myself in a muddle and hoping someone can help! I am analysing a discrete data set - I am comparing my control and experimental group,...

• Replies: 0
• Views: 2,457
08-09-2008, 09:28 AM
22. ### A problem about poisson process

Hi all, I have a question about the poisson process. Below is the queston: Consider each transition of the poisson process as an event, for...

• Replies: 0
• Views: 2,454
04-26-2009, 04:56 PM
23. ### Machines fail randomly once a month on average.

With one machine how long do I have to wait, on average, for a failure? I don't know when the last failure was. How long for the first failure...

• Replies: 4
• Views: 2,453
03-15-2010, 09:55 AM
24. ### Expectation of a density function

Hi guys, I have a question about the calculation of the expectation based on a density function where the integral is NOT 1. Is it okay to...

• Replies: 4
• Views: 2,453
01-14-2014, 02:07 PM
25. ### Help!!!!

the demand for a magazine is thought to be modelled by a Gamma distribution with mean 10,000 and variance 1,000,000. A publisher prints and...

• Replies: 2
• Views: 2,451
02-24-2010, 08:03 AM
26. ### 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: 2,450
heD
01-31-2006, 11:22 PM
27. ### probability help pugowner

14. A study was made to determine the calories, total fat content and sodium in 54 brands of “veggie” burgers as shown below. < 130...

• Replies: 5
• Views: 2,450
10-04-2008, 05:06 PM
28. ### stuck on a probability problem

THe question is according to the January theory if the stock market is up in Jan. it will be up all year, if its down it will be down all year....

• Replies: 0
• Views: 2,450
09-26-2009, 05:46 PM
29. ### variable dependency check

hi, i am a bit confused. i know how to check if two variables are not correlated. but how do i check they are independent? for instance i have...

• Replies: 0
• Views: 2,450
01-24-2010, 04:32 AM
30. ### Determine the risk (probability) of meeting forecasted demand

Hi, I'm doing a project for a car company for my final year studying Industrial Engineering. The company forecast demand 4 months ahead but,...

• Replies: 1
• Views: 2,450
05-08-2016, 02:03 PM
31. ### Need Help with Practice Exam Question ASAP

Hi. I have an exam coming up and I have no clue on how to do this problem on the practice exam. Can someone help me as soon as you can? Thanks. ...

• Replies: 0
• Views: 2,449
08-06-2007, 08:03 AM
32. ### Mutual independence -> Conditional independence ?

hi, all! I have the following question about relations between conditional independence and mutual independence: Does Mutual independence imply...

• Replies: 1
• Views: 2,448
05-07-2012, 09:31 AM
33. ### Polyp probability

some help would be greatly appreciated, this should be easy for people here, but unfortunately i am bad with this stuff. 15 polyps are discovered...

• Replies: 12
• Views: 2,448
06-27-2012, 12:15 AM
34. ### Binomial Probablity Distribution exactly one & and at least one.. check my answer

Your favorite baseball player has a 0.300 batting average (that is, he averages three hits for every 10 times he is up to bat). If he is up to bat...

• Replies: 3
• Views: 2,446
10-11-2016, 02:35 PM

hello I really need some help.. I have a test tomorrow and Im still a little confused. MNM Corp. gives each of its employees an aptitude test. The...

• Replies: 1
• Views: 2,445
11-15-2006, 05:48 PM
36. ### Confirmation?

Just wrote an exam, was able to copy down the questions along with my answers. I don't need you to solve them, but just to clarify some things. 1)...

• Replies: 2
• Views: 2,445
02-13-2009, 10:17 AM
37. ### Question trouble...

Working on this for a class and wondering if I did this correctly. If anyone could help that would be great. Thanks in advance! 60% of the...

• Replies: 2
• Views: 2,445
09-28-2009, 10:50 PM
38. ### Joint Density Help

What is joint density?

• Replies: 0
• Views: 2,445
11-23-2009, 02:22 AM
39. ### question regarding distribution mean (app Crystal Ball)

Hi everyone, I have a question that I have come across running some Crystal Ball simulations however, I think the problem is rather a generic...

• Replies: 1
• Views: 2,444
BGM
11-11-2011, 05:27 AM
40. ### How to calculate the probability between two normal distributions?

Using the normal distribution. Let X  N(1, 2) and Y  N(2, 3) where N(μ, variance) denotes the normal distribution with mean μ and variance . X...

• Replies: 7
• Views: 2,444
02-21-2013, 07:42 PM
41. ### Help with problem

I am studying a non-symmetric binary memoryless transmission channel. Where the probability to receive a logical 0 when we send a 1 I have named it...

• Replies: 1
• Views: 2,443
BGM
11-17-2010, 11:38 AM
42. ### Probability question

In a city where 30% occupants are foreign, the probability of a foreign being questioned is 40%, while for a local is 10%. What is the likelihood...

• Replies: 2
• Views: 2,442
11-21-2006, 01:21 AM
43. ### What's wrong with this sample space?

"A coin is tossed until for the first time the same result appears twice in succession. Describe the sample space." My answer: \Omega :=...

• Replies: 6
• Views: 2,442
08-07-2012, 01:08 PM
44. ### here is another one

I have done this a million times with the same result... it is apparently incorrect but I cannot figure out why... what percentage of a circle will...

• Replies: 1
• Views: 2,441
04-15-2006, 11:18 PM
45. ### binomial probability

ok so here is the question i attempted but no getting the answer a loan officer has indicated that 80% of all loan application forms have zero...

• Replies: 0
• Views: 2,440
03-19-2012, 06:48 PM
46. ### random sampling question - I need help

A journalist wanted to learn the views of the chief executive officers of the 500 largest United States corporations on program trading of stocks. In...

• Replies: 2
• Views: 2,439
04-01-2006, 01:20 AM
47. ### Probability help

An investment offers the chances of various returns for each of 3 years as follows- Year Return- $30,000$40,000 1 ...

• Replies: 0
• Views: 2,439
04-27-2008, 05:35 AM

X) How many different eleven-letter words (not necessairly pronounceable or meaningful) can be made from the letters in the word MISSISSIPPI? ANS:...

• Replies: 4
• Views: 2,439
09-20-2008, 12:20 PM
49. ### Trying to help out a teacher with this

My neighbor is an elementary school teacher and asked for my help with this, but I haven't done a math problem like this in years! She's grading...

• Replies: 1
• Views: 2,439
01-24-2009, 05:43 PM
50. ### The multi-factor model is a multivariate gaussian distribution?

I'm sure that the following question is trivial, but I can't found a solid demonstration. Can we state that multi-factor model is a multivariate...

• Replies: 1
• Views: 2,439
07-16-2012, 11:11 AM
51. ### formulating probabilities

Could anyone help? Please! Joe Smith batted .347 in 2007. So assume the probability of getting a hit is .347 for each time he batted. In a...

• Replies: 1
• Views: 2,438
09-10-2008, 07:13 PM
52. ### A large and powerful corporation is extorting money from the public.

When confronted with ****ing evidence the corporate CEO says these were rogue employees, these were anomalous cases, etc., etc., etc.. . . . ...

• Replies: 5
• Views: 2,438
08-07-2011, 09:47 AM
53. ### Need help with this problem

On average, every six minutes a car passes by a sector in which it plans to build a tunnel. The passage of many vehicles indicate risk of congestion...

• Replies: 2
• Views: 2,438
03-05-2014, 07:24 PM
54. ### calculating frequency of ingredients in various cookbooks?

Hi Everybody I just need a push in the correct direction of which statistics formula I should use and how? I am given x number (unknown) of...

• Replies: 3
• Views: 2,437
07-19-2006, 09:14 AM
55. ### Monty Hall

You are playing a game show, in which there are prizes behind three doors. One prize is good (eg a car), and the others aren't (eg. a goat and a...

• Replies: 1
• Views: 2,437
10-07-2008, 10:06 PM
56. ### Drawing more than 1 marble

Hi, My answer doesnt tally with the answer provided, can someone please have a look and figure out where I am mistaken? Thank u so much If four...

• Replies: 2
• Views: 2,437
BGM
09-12-2011, 01:14 PM

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