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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: 30,190
09-30-2005, 09:44 AM
1. ### Stuck on this...

I'm kind of stuck on my homework. I was given a chart of a total of 1052 people (men 495, women 557) in four categories: nonsmokers (men 335,...

• Replies: 1
• Views: 3,267
02-26-2006, 10:39 PM
2. ### In a certain town....

40% of voters favor a given ballot measure. For groups of 22 voters, find the mean and standard deviation for the number who favor the measure.

• Replies: 0
• Views: 4,296
03-19-2006, 10:21 PM
3. ### Normal Distribution

Assume x has a normal distribution, and find the indicated probability. The mean is 200, standard deviation 50. Find the following probability: ...

• Replies: 3
• Views: 3,400
04-08-2006, 02:59 PM
4. ### Lottery draw question (hypothetical)

I'm new to the forum, and certainly no math wizz, but I'm hoping someone can help me with a hypothetical lottery problem. Basic setup: there are...

• Replies: 1
• Views: 3,080
08-21-2009, 05:01 AM
5. ### Mr

Need to simultaneneously compare child-woman ratios of two censuses presented in 2 (4*7) tables;4 educational categories and 7 age-groups. Any...

• Replies: 5
• Views: 2,385
04-01-2009, 04:56 PM
6. ### lizards probability question

Note: This is not homework, I am a Biologist trying to learn basic statistics. Hi, I am trying to learn basic probability and I would like to get...

• Replies: 0
• Views: 1,743
12-14-2013, 11:42 PM

40 teams are taking place in a knock-out competition in which there is no seeding. They all have rankings determined by previous performance. The...

• Replies: 1
• Views: 1,114
10-11-2012, 09:26 AM
8. ### Trying to calculate Prize Odds

am currently trying to come up with the odds on picking a perfect fantasy football lineup. I see NFL.com has a challenge of picking a perfect NFL...

• Replies: 1
• Views: 1,198
08-20-2013, 03:59 PM
9. ### Simple probability

If I have: The year of eruption The month of eruption 1660 July 1682 August 1694 April 1698 January 1707 July 1737 May 1760 March

• Replies: 2
• Views: 2,023
12-03-2013, 08:48 AM
10. ### Fishing Probability

The probability that Pete will catch fish on a particular day when he goes fishing is .8. Pete is going fishing 3 days next week. The probability...

• Replies: 1
• Views: 6,368
04-22-2012, 04:17 PM
11. ### What do you think ?

I am new to stats so I need help They have also asked the probability of an individual consumer receiving a prize over the course of a year. For...

• Replies: 2
• Views: 2,119
02-23-2006, 01:07 PM
12. ### Variances in Predictions?

Hi All: I am new to this forum, but glad that i have found it! I posted this in the statistics forum but it may be better suited here. ...

• Replies: 0
• Views: 2,683
11-28-2008, 12:26 PM
13. ### Gambling Theory / Martingale

Is anyone here familiar with gambling theory? If so, is the Martingale system a viable betting strategy where P(w) > .5, say .5061. Does anyone...

• Replies: 0
• Views: 1,951
01-28-2007, 09:31 PM
14. ### Statistics question for algorithm development

Hi, This isn't a homework help question. I'm actually trying to figure out some formulas for algorithm programming. I'm trying to calculate...

• Replies: 0
• Views: 2,213
08-02-2010, 04:33 PM
15. ### Desperate to understand....

Desperate to understand how to calculate p value for my research on object line degradation, I have tried SPSS, etc, but am getting more and more...

• Replies: 3
• Views: 1,983
01-16-2013, 01:05 AM
16. ### Probability calculation on 2 similar vases with difference in time and backlog

Hi all, Below is a problem that we find hard to solve, any input would be much appreciated. In short, we're looking for the exact probability...

• Replies: 0
• Views: 1,813
07-21-2016, 07:34 AM
17. ### Looking for help with a question :)

Hi folks, I'm trying to help a friend with some statistics but since I study engineering it's not something I have covered. If anyone could assist me...

• Replies: 1
• Views: 2,653
03-10-2011, 10:07 AM
18. ### picking 50 yellow marbles

If there's a jar with 663 yellow marbles out of 849 total marbles, what is probability that i will extract 50 yellow marbles in 50 tries?

• Replies: 6
• Views: 3,306
03-10-2009, 11:02 AM
19. ### 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: 3,406
02-26-2012, 05:35 AM
20. ### Venn Diagram for Random Variables

Hi All, I was wondering whether it is possible to represent random variables in venn diagrams. As far as I've read, the distribution of...

• Replies: 2
• Views: 2,145
01-18-2012, 01:03 AM
21. ### Markov Random Fields

Hi All, Can anyone kindly refer me to an easily explained tutorial on Markov Random Fields/Markov Networks? Thank you. Meeta

• Replies: 0
• Views: 1,525
01-20-2012, 01:33 PM
22. ### Probability Question

Hi, I have two questions that I'm currently struggling with, the first one states that there are 40 red balls, 40 green balls, and 20 blue balls....

• Replies: 1
• Views: 5,040
11-04-2006, 08:27 AM
23. ### Success by chance?

I have a problem where participants had to discriminate two objects, and success was defined was getting 9 correct in a 10 trial run - meaning that...

• Replies: 10
• Views: 3,732
02-27-2008, 11:27 AM
24. ### uniform distribution

A manager of a store reports that the time of a customer on the second floor must wait for the elevator has a uniform distribution ranging from 2 to...

• Replies: 5
• Views: 8,245
10-24-2005, 12:04 PM
25. ### more uniform dist.

If a is uniformly distributed over (-21,25), what is the probability that the roots of the equation x+ax+a+80=0 are both real? I have no idea what...

• Replies: 1
• Views: 3,966
10-23-2005, 06:57 PM
26. ### candy

A candy store owner has daily demand Y for a certain brand of candy sold from the bulk bins. Suppose the owner will never stock more than one...

• Replies: 5
• Views: 4,641
10-25-2005, 04:51 PM
27. ### deciles

Women's weights are normally distributed with a mean of 143 lb and a standard deviation of 29lb. Find the third decile, D3, which separates the...

• Replies: 1
• Views: 4,719
10-24-2005, 12:20 PM
28. ### need help with set-up

Give the joint density f(x,y)= 60xy^2 if 0<x<y<1 and 0 otherwise, find P(X+Y<1). I just need help setting up the integral...I don't know what to...

• Replies: 1
• Views: 4,346
11-20-2005, 06:31 PM
29. ### Raw moments of 3-parameter Weibull distribution

Hi, I know that the formula for computing the raw moments of 2-parameter Weibull distribution is: Mu'n=b^n*Gamma(1+n/c), where b and c are scale...

• Replies: 2
• Views: 1,224
08-26-2015, 12:37 AM
30. ### zero inflated poisson distribution

I am new and I hope I'm abiding to the rules. I just wanted to know what exactly a zero inflated Poisson distribution is? How is it related to the...

• Replies: 2
• Views: 6,378
03-16-2010, 09:21 AM
31. ### Poisson Distribution

Here's the question: The number of calls that come into a small mail-order company follows a Poisson distribution. Currently, these calls are...

• Replies: 1
• Views: 5,385
02-24-2011, 04:17 AM
32. ### Confidence interval estimate - distribution binomial, variable when positive

Hi, Here is my situation: I have a sampling of 60 bills on a population of size 2300. On that sampling, 20 have an error, i.e they have been...

• Replies: 2
• Views: 2,931
BGM
11-18-2011, 02:07 AM
33. ### probability question about composing a song

i have 450 numbers and i want to know which group of numbers have more probability lower of the average or higher and why :i dont know statistics...

• Replies: 0
• Views: 1,419
09-01-2011, 01:01 PM
34. ### help me

can any bady help me to solve this problem :confused: Problem 1: An airline finds that 4 percent of the passengers that make reservations on a...

• Replies: 6
• Views: 2,712
12-04-2006, 04:11 PM
35. ### Care to place a bet? (probability guru needed)

I consider myself pretty good when it comes to math and probabilities, but this has me stumped. It's your lucky day! A man offers you a fair coin...

• Replies: 1
• Views: 2,085
BGM
03-04-2014, 10:14 PM
36. ### need help to calculate variance of sales

Hi, I'm trying to calculate numerical value of the variance of sales, and the probability of a sale greater than 6300 cans. but it seems wrong...

• Replies: 14
• Views: 6,729
09-21-2011, 07:18 PM
37. ### Binomial Distribution Problem

I'm at work, so I don't have the problem verbatim, but it's something like this: Suppose that companies who launch products with revenue growth as...

• Replies: 0
• Views: 3,301
10-23-2006, 08:49 AM
38. ### Complicated Probability

Q1. Suppose that four regular 6-sided dice are flipped. 1.What is the probability of a "three-of-a-kind" that is, three of the dice show the same...

• Replies: 1
• Views: 1,792
BGM
11-23-2011, 01:53 AM
39. ### Probability question -- T Distribution

You are the head of the Amex card group. Nationally, the credit card default rate is at 12&#37; A random sample of 25 Amex card holders shows a default...

• Replies: 3
• Views: 2,637
11-08-2008, 08:54 AM
40. ### Somebody please verify the solution i have posted, am not 100% sure

A telecom produces telephone sets in two plants: New York, and Buffalo. Daily production volumes of a certain model are : 500 and 2000 units...

• Replies: 1
• Views: 2,064
11-13-2008, 04:39 PM
41. ### simple chi-squared problem

This is probably a very simple problem Y is distributed by the chi-squared distribution with 5 degrees of freedom. Calculate the probability that...

• Replies: 2
• Views: 2,909
07-12-2010, 09:00 PM
42. ### question about binomial distribution

If the probability distribution of Y is defined by a binomial distribution, what would be the limiting distribution of Y/n as n approaches infinity?...

• Replies: 3
• Views: 4,058
07-13-2010, 09:26 PM
43. ### testing hypotheses

Out of an i.i.d sample, with N = 200, and a sample mean of 7000 and sample variance of 700, how would you answer the following question, At 5%...

• Replies: 5
• Views: 3,278
07-14-2010, 05:20 PM
44. ### Binomial Distribution as N goes to Infinity

I know that the Central Limit Theorem says that all types of distributions go to normal distribution as N goes to infinity. However, is there some...

• Replies: 6
• Views: 9,115
07-15-2010, 07:36 PM
45. ### question about likelihood function/MLE

If a random variable Y has the following probability distribution: P (Y = 1) = p, P (Y = 2) = q, and P (Y = 3) = 1−p−q. A random sample of size n...

• Replies: 6
• Views: 4,509
08-06-2010, 10:25 AM
46. ### A bet between a buddy and I regarding the lottery

Hello all, My coworker is convinced that the Powerball lottery is rigged against those players purchasing more than one game (set of 6 randomly...

• Replies: 8
• Views: 1,880
09-08-2015, 11:23 AM
47. ### Normal distribution probability density function returning values > 1

i am trying to draw a normal curve over a histogram of some data of mine and i just can't get it to come out right! Mean =1.002327404 Standard...

• Replies: 11
• Views: 6,356
10-03-2008, 04:50 PM
48. ### random variables - expected value of time taken to perform a service

Hello everyone, My name is Alex, I am from Spain and I need help. I am not trained in statistics and all I know is a little bit from school and...

• Replies: 5
• Views: 2,008
07-31-2012, 01:35 AM
49. ### A simple Probability question....

MALE FEMALE Thrombosis 10 14 Appendix 15 10 Blood-Pressure 25 18 TOTAL 50 42

• Replies: 1
• Views: 2,204
10-21-2007, 09:35 AM
50. ### Probability for Zener pyshic card test

Hi, My Name is Mark Fennell, and I am a flash game developer. (My games are at www.markfennell.com/flash and www.blastone.com) Anyways, my next...

• Replies: 3
• Views: 8,501
01-20-2009, 09:01 PM
51. ### help with a tricky question

hi guys, when i was looking for statistics exams to practice i found this problem at mit final exam back at 2004 the condition for failure of a...

• Replies: 6
• Views: 1,710
MFM
04-21-2014, 04:52 PM
52. ### Confidence interval?

I am trying to create intervals in my data such that each interval contains the same number of samples within its bounds. I created a histogram...

• Replies: 3
• Views: 3,888
05-09-2011, 08:49 PM
53. ### Joint Probability Distribution

Can anyone help? The problem: Experiment = {A balance six-sided die is rolled twice} Random Variable X = {the number of 4s obtained in two...

• Replies: 3
• Views: 3,608
10-08-2006, 09:28 PM
54. ### Probability! HELP!

for the fiscal year 2007, a tax authority audited 1.53% of individual tax returns with income of 100,000 or more. What is the probability that two...

• Replies: 1
• Views: 2,570
10-20-2009, 10:47 AM
55. ### Familywise Type II error rates

There is a lot in the literature on familywise Type I errror rates but no explanation of familywise Type II error rates. If familywise rates remain...

• Replies: 0
• Views: 2,730
12-09-2010, 03:14 PM

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