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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: 30,307
09-30-2005, 09:44 AM
1. ### Quick Probability Increase Logic Question

I have 2 events, each increase the overall probability by 20%, events are independent of each other: Original probability 10/100 1st event...

• Replies: 1
• Views: 2,004
06-21-2013, 11:25 AM
2. ### overlap integrals for empirical data

Hi, I have two sets of data each originating from a different probability density function for a continuous stochastic variable (I do not know how...

• Replies: 2
• Views: 4,138
04-13-2010, 08:13 PM
3. ### family game: how many combinations are possible?

Hi guys I'm almost getting crazy. We are playing a game in our family and i wanted to demonstrate my son for what probability is useful. Now i am...

• Replies: 1
• Views: 1,144
BGM
04-06-2015, 06:44 AM
4. ### Suggested Book on Probability

-------------------------------------------------------------------------------- I have never taken a course in probability. My teacher recommended...

• Replies: 2
• Views: 2,454
06-06-2011, 03:16 AM
5. ### Probability exam questions with worked-out solutions

Students can download from http://personal.vu.nl/h.c.tijms/ExamQuestionsUP.pdf a collection of more than 150 probability exam questions with fully...

• Replies: 0
• Views: 5,767
04-26-2013, 03:53 AM
6. ### Probability of a string containing a specific substring

So I've been getting into concepts like the Library of Babel and infinite monkey theorem, and have been trying to work out how to calculate the...

• Replies: 1
• Views: 6,677
01-18-2012, 11:22 AM
7. ### Estimating Conversion Rate When Data is Sparse

I'm a co-founder of a startup, and am seeking help with a statistical problem. I've been wracking my brains over this, and wondered if any of you...

• Replies: 0
• Views: 1,963
08-06-2011, 08:10 PM
8. ### Frequency of Exceedance, Paired Data, and Cumulative Frequency

Hello, I am working on an analysis problem that I was hoping folks could provide feedback on. I have a paired timeseries dataset (groups A and...

• Replies: 0
• Views: 1,117
12-23-2015, 05:00 PM

if you have a trading system that is right 80% of the time and the risk/reward is 0.8/1 what is the probability of getting to breakeven in 50 trades?...

• Replies: 0
• Views: 1,515
08-07-2011, 03:55 PM
10. ### Normal Distribution

I am currently working on this problem: Tire compnay produces tires whose diameters are normally distributed, with mean =36 inches and standard...

• Replies: 2
• Views: 1,769
06-03-2008, 11:48 AM
11. ### question on standard deviation?

hi i missed this on the text. does anyone know how to work this problem on a multiple choice test with 11 question each question has 4...

• Replies: 2
• Views: 3,760
06-25-2009, 12:29 AM
12. ### random variable?

A graduating senior seeking a job has interviews with two companies. After the interview, he estimates that his chance of getting an offer from the...

• Replies: 3
• Views: 3,751
09-04-2008, 07:10 AM
13. ### Video game equipment

Hello everyone, My friend has been playing this game called Tabula Rasa, and is trying to make the perfect armor for his character. In order to do...

• Replies: 5
• Views: 4,638
05-30-2008, 12:00 AM

On the desk, you have 40 envelopes. Each contain a cash prize (unknown until opened): 5 - contain $10,000 6 - contain$5,000 9 - contain $1,000... • Replies: 3 • Views: 2,967 10-30-2006, 03:23 PM 15. ### World Cup - a simple probability question Hi All I hope this is not considered too far outside the purpose or spirit of this site! I haven't touched statistics since doing A level... • Replies: 2 • Views: 2,566 06-21-2006, 10:50 AM 16. ### Help combining probabilities I am a relative novice concerning statistics and probability, and was hoping for some assistance with this problem. I have a substantial database... • Replies: 0 • Views: 2,096 12-22-2010, 03:47 AM 17. ### Possion Process Question Uploaded with ImageShack.us I attempted this question and I was wondering two things 1) whether the answer is correct 2) and whether the hand... • Replies: 0 • Views: 1,062 05-15-2013, 12:04 PM 18. ### Stochastic Processes - Probability of r heads in a row before s tails in a row? A biased coin is tossed repeatedly, with p the probability of heads on any single toss. Find the probability that there is a run of r heads in a row... • Replies: 2 • Views: 2,735 04-17-2013, 07:57 PM 19. ### Poisson Process Question (Last) Could someone kindly check whether or not my answer is correct to part a of the question. Ive listed the solutionts to part b) which I found on the... • Replies: 0 • Views: 1,073 05-15-2013, 12:14 PM 20. ### Continuous Local Martingale Question I have attempted the following local martingale question. I'm not sure if the proof is correct. If M is in the space of continuous local... • Replies: 2 • Views: 1,215 03-26-2014, 08:30 AM 21. ### Mice in a maze probability puzzle I’ve got a probability puzzle I am trying to solve and was hoping somebody could help. It comes from some chemistry experiments I’m doing, and not... • Replies: 2 • Views: 4,960 08-13-2008, 10:51 AM 22. ### Binomial question? I have this question that I think is binomial probability. Bananas that are almost ripe to pick carry the chance of being 15% rotten. What would be... • Replies: 4 • Views: 1,627 07-21-2015, 12:32 PM 23. ### quest. Hi! Not looking for answers, just direction -- don't know what type of probability model to use to se up Q: Quality control inspector for company... • Replies: 2 • Views: 3,250 11-04-2005, 01:49 AM 24. ### How to find the probability of a podium finish Say in a race there are 22 competitors and say that the probability of driver A of winning the race is 55%. How can one calculate the probability of... • Replies: 5 • Views: 2,186 10-08-2013, 10:57 PM 25. ### Hi, please help me this one Statistic question for test tomorrow? 1. Subway Sandwiches wishes to introduce a new condiment, carrot, to its sandwiches. To test whether "carrots" will be well-received by its... • Replies: 1 • Views: 1,224 12-12-2013, 02:17 AM 26. ### I'm curious... I was just looking over an old exam, and I came across a problem with T scores. I know how to work with z scores, but I'm confused with T scores. I... • Replies: 1 • Views: 2,291 09-13-2006, 08:35 PM 27. ### 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: 6,284 03-11-2010, 12:45 PM 28. ### positions of letters in texts (coincidence?) Hi everyone. Please excuse this stupid question but here it is anyway: What are the chances of the following occourring in a book? On page... • Replies: 2 • Views: 2,523 01-28-2009, 07:39 AM 29. ### Probability of hitting a certain number Random numbers between 5 and 18 are continually added to increase a sum, starting at zero, what is the probability that you will hit the number 72? • Replies: 5 • Views: 2,421 10-21-2007, 09:55 PM 30. ### Analyzing test results- Normal Distribution I’m trying to compare my grade on my Algebra exam to my fellow students using the normal distribution. Here are the results of the exam: ... • Replies: 0 • Views: 5,729 06-20-2006, 10:02 AM 31. ### Test Score Probability I’m trying to compare my grade on my Algebra exam to my fellow students using the normal distribution. Here are the results of the exam: ... • Replies: 1 • Views: 6,107 09-14-2006, 01:00 PM 32. ### Poisson Mean Hello Everyone, Im not sure if i posted at the right section if not im extending my apologies in advance. Ive been reading this network... • Replies: 0 • Views: 2,204 05-19-2008, 12:24 AM 33. ### Normal Distribution Problem Hi, I've been working on this problem for a while now and keep getting stuck. The problem says, The length of time before a cell phone using a... • Replies: 1 • Views: 4,449 07-03-2007, 01:37 PM 34. ### Generate Random Correlated Variable I have established a correlation between independent X and dependent Y. Is there a formula for generating a random Y from a particular X? For... • Replies: 17 • Views: 15,284 06-29-2012, 09:43 AM 35. ### Confidence Help I am trying to make some observations from a data set of independent and dependent variables. Using its S and AD Test statistic, the set of natural... • Replies: 0 • Views: 1,098 07-25-2012, 01:40 PM 36. ### Prediction & Autocorrelation I have a set of dependent variables which are serially correlated. I understand the confidence and prediction intervals are actually much broader... • Replies: 0 • Views: 1,631 08-07-2012, 11:18 AM 37. ### z standard normal First part of the question asks..if X is normal with mean = 8.48 and sd = 1.6, what are the 2 values of X which include central 80% of probability? ... • Replies: 1 • Views: 5,491 04-11-2008, 07:18 AM 38. ### probability help! mean =$1530 sd = $120 Bookstore must sell at least$1200 in sales to break even. What is the probabily that on a given day the bookstore will...

• Replies: 1
• Views: 2,107
04-11-2008, 07:12 AM

I am trying to finish my thesis for my Masters in Civil Engineering and have run into a statistics/ probability question which my one Engineering...

• Replies: 6
• Views: 2,768
02-05-2009, 06:45 PM
40. ### Probability Homework

I have a probability question that I have no idea where to start. It is probably simple but I don't have any idea where to start. I was thinking it...

• Replies: 0
• Views: 2,797
cjb
09-13-2009, 10:52 PM
41. ### Permutation or Combination? Who knows? How to know?

I think I have a decent understanding of the difference btwn permuation and combination. But occasionally a word problem comes up that throws me a...

• Replies: 2
• Views: 6,127
04-18-2006, 04:35 PM
42. ### Prob w/Combination of At Least AND Combination

I'm stuck on this. I've had similar probs, but none that combine the At Least with this type of selection. I really hate to ask for help on a...

• Replies: 5
• Views: 10,436
04-23-2006, 08:38 AM
43. ### Probability question making my brain hurt :p

"suppose you know that a friend of yours has two children and that at least one of them is a boy. One day, you visit your friend's house and his son...

• Replies: 1
• Views: 10,144
03-18-2014, 03:22 AM
44. ### Probability and coincidences help

Can someone please help in the breakdown of how I do this question I am completely lost and I am not sure how to even word the answers ...

• Replies: 0
• Views: 935
03-22-2014, 01:51 AM
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: 2,826
01-29-2013, 12:45 PM
46. ### Raffle with many entries per person, many prizes, limit one prize per person

Consider a raffle for which each person may buy any number of tickets. There are many prizes but each each person may only win one prize. What is the...

• Replies: 2
• Views: 7,563
BGM
01-19-2012, 01:55 PM
47. ### how many degrees of freedom do I need to make a Root Sum Square valid?

If I have two errors, that seems on the low end for using RSS. If I have a hundred, I feel pretty comfortable. I'm having trouble finding math...

• Replies: 0
• Views: 4,606
01-17-2011, 03:43 PM
48. ### Probability Question (Ambiguous)

SOLVED BY MYSELF, YOU CAN CLOSE THE THREAD :) Hi guys, I'm new to this forum, and some of you might find it annoying that I post a question...

• Replies: 1
• Views: 1,510
10-24-2013, 05:02 PM
49. ### Bayesian Approach To Combine Multiple Weighted Inputs

I'm beginning to learn about Bayesian theory but I'm stumped on the ideal approach for combining multiple weighted inputs. Here's an example to make...

• Replies: 2
• Views: 1,196
05-08-2016, 10:59 AM
50. ### r-value > Probability

I have two wrestlers who are going to arm-wrestle. I want to try to predict who will win based on their previous fights against other opponents....

• Replies: 14
• Views: 7,047
08-24-2011, 06:14 AM
51. ### Easy Probability Question

Hi. I have an easy probability question. If you flip a coin 50 times, what is the probability of getting 70% heads? Sorry this is so easy,...

• Replies: 7
• Views: 2,890
11-04-2010, 05:05 PM
52. ### Simple Probability Question

Hi. I have a simple probability question: Not counting the greens, what are the odds of getting 19 of the same color in a row in roulette? ...

• Replies: 7
• Views: 3,414
12-02-2010, 12:44 PM
53. ### Equity Trading Probability Question

Hi Talk Stats, I'm an equity trader who is testing a new strategy. So far, we have succeeded on 72 of 103 trades, or a success rate of 69.90%. ...

• Replies: 2
• Views: 2,282
02-03-2011, 04:06 PM
54. ### What minimum sample size should relfect the distribution of the overall population

If I have exam grades for a large population (2500), what is the minimum sample/class size for which I can expect the distribution of grades for the...

• Replies: 0
• Views: 3,556
02-16-2009, 01:05 PM

Im looking back over an old assignment and I cant figure out how to get the correct probability Question: what is the probability of encountering...

• Replies: 3
• Views: 2,256
10-26-2008, 02:37 PM
56. ### binomial distribution

A "thinking" question I need help with regarding binomial distributions and I have no clue what they mean. Please help!! I can do the problems O.K....

• Replies: 0
• Views: 3,812
12-29-2007, 10:36 PM
57. ### Binary Bootstrap

Is it valid to use a bootstrap technique for estimating variance in a binary (yes/no or 1/0) data set? My motivation for doing so is to perform...

• Replies: 5
• Views: 7,406
09-29-2009, 04:01 AM

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