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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: 31,130
09-30-2005, 09:44 AM
1. ### !!!URGENT!! convolution problem

a signal x(t)=delta(t) is filtered by the filter f(t)=u(t)-u(t-1) multiple times. *compute and plot the result of the first and second application...

• Replies: 0
• Views: 2,755
11-02-2010, 12:42 AM
2. ### !HELP! in PROBABILITY Question! Please!

A Level Statistics Question (Probability) Q. In a class, 25% of students are British and 55% are American. If 15% are both British & American,...

• Replies: 1
• Views: 3,350
12-11-2007, 04:49 PM
3. ### #s out of a bag!

Hello, I am new to the forum, and have joined because the following question has stumped me. There are 11 balls in a bag numbered 0-11. You...

• Replies: 0
• Views: 1,368
11-13-2015, 06:01 PM
4. ### Μarginal Distributions of f(x,y)

f(x,y) = e^(-x), 0<=x<inf, 0<=y<=1 To find the marginal PDFs here is what I did so far: Marginal Distribution of x: f(x) = integral...

• Replies: 2
• Views: 123,421
10-16-2011, 12:42 PM
5. ### α = 0.05 vs p-value?

So I've got a couple questions on my stats homework as follows: E. Canis infection is a tick-bone disease of dogs that is sometimes contracted by...

• Replies: 4
• Views: 52,793
09-30-2012, 04:51 AM
6. ### π-system and monotone class

Assume P is a π-system (that is, P is closed under finite intersections) and M is monotone class (that is M is a non-empty collection of subsets of Ω...

• Replies: 3
• Views: 132,150
BGM
12-17-2011, 10:54 AM
7. ### φ Distribution Table

Hi, I'm currently looking for the φ distribution table, to calcuate marginal effects in a probit model. Unfortunatly there isn't one in my...

• Replies: 0
• Views: 189,174
04-15-2011, 05:59 AM
8. ### "Bridging" uniform and "mass" distributions

My goal is to find a family X(a, b) of random variables (continuously) depending on two non-negative parameters a and b . The family should have the...

• Replies: 2
• Views: 2,301
04-26-2011, 11:22 AM
9. ### "either but not both" ??

Hi, I was trying to complete this question, but I'm confused about where either but not both comes in: "certain chickens on a large farm have...

• Replies: 2
• Views: 4,316
rlm
09-10-2012, 04:43 PM
10. ### "Exploding" Dice Probability (Talk to me like I'm an idiot)

Hi All, First off, let me just start by saying that my mathematical savvy leaves a lot to be desired. I didn't take a lot of math in school, and...

• Replies: 1
• Views: 2,014
BGM
10-06-2016, 01:04 AM
11. ### "Fair Game" problem

Hello, I'm new here. I joined in the hope that someone would be able to help me with this problem: --- Players A and B play a fair game for \$20:...

• Replies: 1
• Views: 3,731
05-18-2007, 12:54 PM
12. ### "Hepatitis" and "Golf" probabilities.

I'm having some trouble with these... A test for Hepatitis A is 98% accurate: if a person has Hepatitis, the test will come out "positive" with...

• Replies: 7
• Views: 7,229
06-01-2008, 06:51 PM

I need a bit of help understanding this concept. I have a paper published in Lancet that show data on the short-term and lifetime risks for...

• Replies: 2
• Views: 2,374
03-01-2009, 09:49 PM
14. ### "Naturally occurring" left-skewed distributions?

hello there. for thesis purposes i'm finding myself with the need to simulate left-skewed distributions with a level of skewness i can determine...

• Replies: 2
• Views: 3,893
07-30-2012, 12:04 PM
15. ### "Show that fY|X(y) is a density function of a true probability distribution"

Where do I begin?? The course I'm taking is focusing heavily on proofs like this, and I'm studying it at a distance so my opportunity to ask...

• Replies: 3
• Views: 1,944
BGM
11-12-2014, 05:37 AM
16. ### "Six nines" reliability vs. safety factor

Aircraft are supposed to have a 99.9999 % chance that they will work over some specified time interval. If a picture weighs 25# and you want the...

• Replies: 3
• Views: 4,704
05-20-2011, 06:05 PM
17. ### "with and without replacement" question

hi, thanks for taking a look. im stumbling on trying to understand one question. the problem is: a box of nine gloves contains two left handed...

• Replies: 1
• Views: 5,932
BGM
09-15-2009, 12:39 PM
18. ### 'Bayesian version' of the Cramer-Rao lower bound?

just wondering if there is some sort of "Bayesian version" of that very useful and popular result that people use in maximum likelihood, the...

• Replies: 3
• Views: 2,953
07-30-2012, 10:00 PM
19. ### 'Shifted' Poisson Processes?

Hi all. I’m a graduate student in ops research, but my research is in the optimization side of things more so than the stochastic processes. I...

• Replies: 2
• Views: 10,912
BGM
05-18-2013, 03:05 PM
20. ### (Bayesian) Frequency and Likelihood Ratio Substitution

I've been trying to learn Bayesian statistics "on my own" and part of how I study is by reading on its application in Court. Recently I've been...

• Replies: 1
• Views: 1,895
12-26-2015, 05:54 AM
21. ### (Simple) proof for the arithmetic mean?

Hello. I am having trouble trying to figure out a way to answer this homework exercise: "Prove that the arithmetic mean cannot be greater than the...

• Replies: 5
• Views: 2,283
02-05-2014, 03:48 PM
22. ### (Simple?) probability question...

Three coins. One is fair; one is two-headed; one is two-tailed. We pick a coin at random, flip it, and it comes out heads. The probability that...

• Replies: 7
• Views: 2,507
12-15-2011, 12:05 PM
23. ### (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: 1,610
04-25-2013, 11:08 AM
24. ### *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: 4,053
11-28-2011, 12:21 PM
25. ### 1 out 101

Hi, I am hoping that someone can help me out with this? If I have 54 numbers on a roulette table, and there is a random generator picking the...

• Replies: 2
• Views: 1,489
11-23-2012, 05:28 AM
26. ### 1-bimoncdf vs binomcdf

Hey, everyone. I'm new here, and I was just wondering what the difference is between 1-Binomcdf and Binomcdf?

• Replies: 2
• Views: 4,055
05-14-2013, 12:33 PM
27. ### 10 books are arranged on a shelf randomly...

10 books are arranged on a shelf randomly. A) What's the probability that between the books "Cinderella" and "The Hobbit" 3 books exactly will...

• Replies: 3
• Views: 3,270
12-26-2008, 02:48 PM
28. ### 10x 1/100

Hi all, Apologizes for the easy question: Imagine a dangerous mountain where the chance of dying is 1%. If a group of 10 hikes the moutain,...

• Replies: 1
• Views: 240
10-01-2017, 02:07 AM
29. ### 12-sided dice probability

How would you give a sample space of rolling a pair of 12-sided dice?

• Replies: 2
• Views: 9,846
10-20-2007, 06:53 PM
30. ### 13 card straight - Calculation correct?

Hello! I am trying to compute the Pr. of being dealt a 13 card straight out of a standard 52 card deck. (ie. 23456789TJQKA) Here's my...

• Replies: 1
• Views: 5,624
03-14-2009, 01:38 PM
31. ### 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: 7,541
12-30-2011, 02:39 PM
32. ### 19 lowercase letters + 1 single digit number = possible combinations ?

Hi everybody and happy new year too all :tup: I've just discovered this forum today and I have one thing to say : AWESOME ! :) I have trouble...

• Replies: 10
• Views: 7,576
01-20-2011, 03:42 AM
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: 2,211
11-03-2012, 08:55 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: 2,582
01-27-2012, 09:01 PM
35. ### 2 four sided dice, probability of 1 dice = 3, sum = even

2 four tetrahedral dice with sides, 1,2,3,4. the two dice are thrown, what is the probability that given the first dice is a 3, the sum of the 2...

• Replies: 1
• Views: 12,093
04-24-2012, 08:56 AM
36. ### 2 Probability problems

I am taking statistics at my local community college and am ONLY doing it because it is required for a BSN degree. I am a 4.0 student, but most of my...

• Replies: 2
• Views: 6,608
06-16-2008, 03:14 PM
37. ### 2 probability question

I have just recently been learning probability and I have been having troubles with some questions. If someone can help me on these two question, I...

• Replies: 1
• Views: 3,804
04-11-2006, 07:54 AM
38. ### 2 questions: Finding the optimal value of the mean of a standard normal distribution.

I have two questions involving the Standard Normal Distribution. The first one involves finding the optimal mean, the second one involves proving...

• Replies: 1
• Views: 3,069
BGM
11-06-2011, 04:02 PM
39. ### 2 randomly selected have same birthday

• Replies: 2
• Views: 6,799
01-24-2009, 06:51 PM
40. ### 2 statistical bioresearch problems

Hello guys, I require your help in my research project. Problem 1: We are filtering a suspension of 1ml containing 1250 cells, through a...

• Replies: 11
• Views: 2,863
09-25-2012, 02:54 PM
41. ### 2012 Presidential Election Probability Calculator

I'm trying to create a calculator to determine odds of Democrats winning the 2012 US Presidential election. I take the electoral college map from...

• Replies: 2
• Views: 4,412
07-31-2011, 02:25 AM
42. ### 3 Coin Bet

• Replies: 3
• Views: 3,847
03-11-2006, 09:56 PM
43. ### 3 Norm Dists (correlated), prob co-occurence of 1% right tail

Hi, hoping someone can lead me in the right direction.. I'm looking at three normal distributions, specifically looking at the 1% extreme in each...

• Replies: 2
• Views: 2,385
10-21-2009, 05:15 PM
44. ### 3D Random Walk

Okay, so I've got this random walk problem here: (a) Using an appropriate Dirac-delta function, find the probability density w(s) for...

• Replies: 1
• Views: 4,891
04-12-2008, 11:32 PM
45. ### 4-alternative forced choice problem

Hi there, I have the following problem: Participants in my experiment were presented with 4 objects and 4 categories and asked to map each of...

• Replies: 2
• Views: 3,031
01-29-2013, 12:45 PM
46. ### 4th Super Bowl Victory

When the NY Giants won Super Bowl XLII it was their 3rd Super Bowl victory AND it was also the third time that I created a NY Giants billboard in...

• Replies: 0
• Views: 2,422
03-05-2008, 02:06 PM
47. ### 5 letter palindrome

Hello, I need help with these two questions. In a 5 letter word (out of 26): 1) What is the probability that L,E and D won't appear? 2) What...

• Replies: 1
• Views: 3,374
11-27-2016, 01:10 PM
48. ### 5% uniform random noise

Can someone describe what 5% uniform random noise is?

• Replies: 0
• Views: 2,897
04-06-2009, 10:01 AM
49. ### 50-50 or just abusing the game?

Hi my name is Oscar and I had a question that has been bugging me and some other friends. We cannot wrap our heads around something and we have our...

• Replies: 9
• Views: 2,325
09-25-2012, 02:12 PM
50. ### 52 card deck

Ok, I have been trying to solve part d) in my homework for the past hour and then I turned to the web and still couldn't find an answer. This is an...

• Replies: 4
• Views: 2,649
01-27-2013, 11:52 PM
51. ### 6 digits number

we want to create a 6 digits number from the digits 1-5, and to keep the condition that each of the 5 digits, appear at least once. what is the...

• Replies: 0
• Views: 2,284
05-10-2009, 08:54 AM
52. ### 600 hotdogs. homework help

Not quite sure how to do B or C. Thanks for the help! Jake runs the concession stand for a Chicago area minor league baseball team. He knows that...

• Replies: 0
• Views: 1,511
10-21-2014, 08:56 PM
53. ### 7 Balls in 7 Buckets

Hi, Say I have 7 balls I can put in 7 different buckets. Define Xn to be the number of buckets with n balls. For instance X3 = 1 is the number of...

• Replies: 0
• Views: 1,207
07-24-2013, 11:10 PM
54. ### 725 Facebook Friends, 6 Birthdays

I logged into Facebook today to find that 6 of my 725 friends had their birthday today. This number seemed quite high to me. What are the odds of...

• Replies: 1
• Views: 1,359
08-27-2012, 03:46 PM
55. ### 818 Facebook Friends, 0 Birthdays

Hi all, first time poster here. I am an avid facebooker and like to wish people happy birthdays when they come up. Today, for the first time, I...

• Replies: 6
• Views: 2,285
08-21-2012, 02:09 PM
56. ### 90 Ball Bingo

In the traditional game of bingo there are 90 balls and each player gets a card with 15 of those 90 balls on arrange in 3 lines of 5. To match any...

• Replies: 0
• Views: 2,970
08-15-2011, 09:54 AM
57. ### 95% CI is Insignificant, P-Value is Significant

Suppose you're performing a 2x2 contingency table analysis. You do your Chi Square or Fisher Exact test, as appropriate, then you calculate an odds...

• Replies: 2
• Views: 10,513
09-02-2010, 10:21 PM
58. ### 97th percentile

"suppose the moisture content per pound of a dehydrated protein concentrate is normally distributed with a mean of 3.5 and standard deviation of 0.5....

• Replies: 5
• Views: 8,047
03-26-2012, 10:34 PM
59. ### 99% CI for failure proportions

Hi, Is this working correct for a 99% CI for the difference between two proportions: p(A) = 11 failures out of 200 p(B) = 6 failures out of...

• Replies: 1
• Views: 2,703
09-15-2008, 04:13 AM

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