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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: 31,138
09-30-2005, 09:44 AM
1. ### calculating $E(Y)$

suppose X is random variable non negative with Distribution function F_{X}(x) and Y is random variable with Distribution function...

• Replies: 1
• Views: 1,141
BGM
05-31-2016, 01:56 PM
2. ### Hypothesis test of sample (yes/no) and proportions

Edit: I'm not sure whether this belongs in statistics or probability forum. Hi guys, I' prepping for exams with old exam questions and I'm...

• Replies: 0
• Views: 1,682
05-25-2016, 06:06 PM
3. ### Probability problem - no idea where to start

Sorry - my question was poorly written.

• Replies: 0
• Views: 1,123
05-25-2016, 05:27 PM
4. ### How to calculate probability of two samples

Hello everyone, Just need advice how to calculate probability of two samples in a 2 x 4 table. so say i have two groups (brown haired people...

• Replies: 0
• Views: 1,768
05-25-2016, 11:25 AM
5. ### Probability problem - descrete Random variable

post deleted...

• Replies: 0
• Views: 1,376
05-25-2016, 08:32 AM
6. ### Is the order of an event occurs in a sequences of events random?

I am interested in knowing how to analyse whether the order in which an event occurs within a sequence of events is random; i.e. is the likelihood of...

• Replies: 0
• Views: 762
05-25-2016, 06:20 AM
7. ### Easy Coin Flip Problem ???

Hi, I need help. Assume the probability of flipping a coin to heads 20 times in a row is 1:1,000,000 Q: Each day you wake up and flip a coin...

• Replies: 7
• Views: 2,108
05-18-2016, 01:54 PM

1. Between two games offered to you, would you rather (i) roll a die once and get paid $1 million for each dot on the upturned face, or (ii) roll a... • Replies: 1 • Views: 2,002 05-17-2016, 08:21 PM 9. ### Roll 2 Dice (2) 2. If you roll 2 fair dice and add the points on each of the upturned face, what is the most likely sum? What is the probability of getting this sum?... • Replies: 0 • Views: 1,847 05-17-2016, 05:32 PM 10. ### Probability question A teacher says 40% of students study for a specific test. If she randomly selects 5 students, whats the probability that 3 studends did not study for... • Replies: 2 • Views: 1,428 05-17-2016, 08:43 AM 11. ### Differences of proportions Please forgive what I assume is the simplicity of these related problems, but I don't seem to find the solution elsewhere. 1) 2 cards are... • Replies: 0 • Views: 1,687 05-16-2016, 08:52 AM 12. ### Hotel overbooking task Hello together, I am a bit lost with this problem that I need to answer for a university project and I hope someone is able to help me solving... • Replies: 1 • Views: 1,967 05-15-2016, 03:13 PM 13. ### should bayes therom be used? Seems like a relatively simple question, but I'm missing it: There are 25 delinquent accounts in 100 accounts. If I choose 75 accounts out of the... • Replies: 2 • Views: 1,340 05-15-2016, 06:41 AM 14. ### Conditional probability of functions. Small question Hey, i was just looking at a question where the question is calculate: P( B(t) =< x| x=B(s) ). That is, calculate the probability that B(t) is less... • Replies: 0 • Views: 1,008 05-12-2016, 06:29 AM 15. ### Moments of a random variable involving numerous Binomial Distributions I am editing my post because it might have been unclear. Suppose X is a random variable involving 4 binomially distributed random variables: X... • Replies: 6 • Views: 1,449 05-10-2016, 10:59 AM 16. ### Challenge: Card drawing probability Hello everybody, This is my first post because this has been in my head and I couldn't hold it any longer! So here it goes: A friend of mine... • Replies: 4 • Views: 1,662 05-10-2016, 06:32 AM 17. ### 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: 2,590 05-08-2016, 02:03 PM 18. ### 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: 1,306 05-08-2016, 10:59 AM 19. ### logistic regression+test of hypothesis Hello guys! I need your advice. I have done a logistic regression to estimate a probability of impaiment occurs or not. My indep.variables were... • Replies: 2 • Views: 2,130 05-07-2016, 02:21 AM 20. ### Markov limit expectation I need to find a limit involving a discrete finite state markov chain with absorbing state. It is given that: q(x,c) = r(x) + \beta E_{c'\lvert... • Replies: 0 • Views: 930 05-06-2016, 10:43 AM 21. ### Number of Positives Hi, If I have 128 samples and each sample has a 0.25 probability of being positive, what is the probability that I will have at least 24... • Replies: 1 • Views: 1,112 05-02-2016, 10:01 PM 22. ### Probability question I recently stumbled up on this question. Need help in solving this. N balls thrown at N baskets, what is the chance that a random basket will have... • Replies: 17 • Views: 3,623 05-02-2016, 06:58 AM 23. ### Dice probability question What are the odds of rolling 2d6(2 6-sided dice) three times and getting two 3s? How about rolling 4 times; 5 times? I know rolling a 2d6 has a... • Replies: 1 • Views: 1,169 04-30-2016, 01:36 PM 24. ### The random variable and Probability. 2 problems Hi, can anyone help me out with these 2 problems? Sorry for language mistakes, translated from German. • Replies: 1 • Views: 1,485 04-30-2016, 11:52 AM 25. ### Probability Of insurance sales Just a disclaimer I know I am omitting important factors such as competition, earned premium etc etc. I'm just using this exercise so I can start... • Replies: 7 • Views: 1,869 04-26-2016, 02:50 PM 26. ### Normal distribution Hi all, I'm generating a random normal distribution and i don't control the mu and sigma (its a matlab function that i need to use because the... • Replies: 2 • Views: 1,259 04-26-2016, 01:31 AM 27. ### Geometric Mean and SD into Normal Curve Hi I'm working with a data set of historical return on a particular investment. I have 556 consecutive monthly price values, and i used those to... • Replies: 0 • Views: 4,773 04-25-2016, 09:38 AM 28. ### Probability of having "Best Qualified" applicants in a subset of the entire pool Probability of having "Best Qualified" applicants in a subset of the entire pool. I am working on an issue, trying to show whether or not an HR... • Replies: 0 • Views: 930 04-25-2016, 12:47 AM 29. ### Not understanding the posterior distribution result So I cam across this question http://pages.pomona.edu/~jsh04747/courses/math152/wu2_f07.pdf I understand majority of it, except the line ξ(θ|x). I... • Replies: 1 • Views: 1,098 04-22-2016, 08:56 PM 30. ### a low correlation and a strong significance = can the null hypothesis be rejected? I have found that there is a very low negative correlation (r= - 0.17) with strong significance (p<0.0001) between A test and B test. The null... • Replies: 7 • Views: 1,571 04-22-2016, 09:07 AM 31. ### Engineering Failure Analysis I'm currently writing a report in which I would like to discuss the potential for failure of several pipelines. If the chance of failure per pipeline... • Replies: 1 • Views: 1,225 04-20-2016, 02:58 PM 32. ### synthetic data (poisson) Hello I'm trying to get a grip of generating synthetic data but I'm having some difficulties ? Following Hilbe2010... • Replies: 0 • Views: 1,666 04-19-2016, 05:57 AM 33. ### Compound Distribution Hyper-Parameters Hi, If a compound distribution is made up of a gamma dist with parameters (a,b), and b is gamma-distributed so that its parameters are (c,d), such... • Replies: 1 • Views: 1,491 BGM 04-18-2016, 01:57 AM 34. ### Sampling with replacement - probability problem Hi all, (this is my first post, hopefully I am not breaking any rules). I have the following problem that I cannot solve: I have a set of... • Replies: 6 • Views: 2,325 04-17-2016, 03:02 PM 35. ### Express similarity measure in terms of probability Hi, I have an image called 'source.png'. And a set (lets call it set-1) of images called 'target-i.png' (where i:1-10). I need to find which of... • Replies: 0 • Views: 1,456 04-15-2016, 05:58 PM 36. ### conditional probability question I'm having trouble with the following problem: I want to know P(X>C | W>C) with C a known fixed constant, X and W both normally distributed... • Replies: 0 • Views: 1,210 04-15-2016, 10:28 AM 37. ### Advantages of having population-defined parameters? Hello peeps. Quick “conceptual”/weird question. While finishing-up my next manuscript, I started thinking that a way to “buff it up” would be to talk... • Replies: 1 • Views: 1,313 04-14-2016, 06:06 PM 38. ### Probability of getting a certain card game hand combo Trying to figure out the chance of getting a certain combination of cards in a card game. This is related to Magic: The Gathering if that matters. ... • Replies: 0 • Views: 955 04-13-2016, 11:31 PM 39. ### Probability and Efficiency I have a probability question I am looking for some help with. In the scenario I perform a task on an object. I will either succeed or fail.... • Replies: 0 • Views: 1,290 04-13-2016, 10:31 AM 40. ### Have the mean, standard deviation and probability...but something seems off! hi all! So I am taking a Quantitative methods class for my MBA and we are just getting started, so I am somewhat overwhelmed. I am taking the... • Replies: 1 • Views: 3,969 04-11-2016, 06:19 AM 41. ### Find E(X) and VAR (X) Question is: There is one error in one of five blocks of program. To find the error, we test three randomly selected blocks. Let X be the number of... • Replies: 10 • Views: 27,645 04-10-2016, 03:54 AM 42. ### Basic Probability Question Hi, could anyone point out the methodology I should use the answer the question below? Your wisdom is much appreciated! Question: "Between... • Replies: 0 • Views: 1,929 04-10-2016, 03:31 AM 43. ### Another game designer dice question... Firstly I want to introduce myself. My name is Daniel and I am a game designer (http://www.hazardgaming.com) when I'm not teaching mathematics. I can... • Replies: 9 • Views: 2,854 04-09-2016, 09:53 AM 44. ### Hypothesis Testing with proportions Calculate and interpret the Z-scores to test significant difference between the proportion of rates of dementia between a. 30-49 year-old US men... • Replies: 0 • Views: 1,355 04-07-2016, 04:30 PM 45. ### Markov hitprobabilities Hey I have to find the equilibrium path in a dynamic directed stochastic game. The equilibrium path are the set of state space points with positive... • Replies: 0 • Views: 971 04-07-2016, 02:30 PM 46. ### Coin flip explanation Hi, I have been wondering about a probability question. Suppose you have a 50% chance of winning$1 when you flip a coin. You also have a 50%...

• Replies: 1
• Views: 1,290
BGM
04-06-2016, 04:07 AM
47. ### Probability

Hello! I will appreciate if anyone can help me with this problem. Thank you!:) 40% of vacationers going to rocky mt. region visit yellowstone...

• Replies: 2
• Views: 1,872
BGM
03-31-2016, 11:26 PM
48. ### Probability question

Out of 12 people in a room, what is the probability that no 2 different people has birthday at the same month?

• Replies: 1
• Views: 1,768
03-23-2016, 04:24 PM
49. ### bayes's theorem and conditional probability question

chat **** get banged

• Replies: 2
• Views: 1,970
03-23-2016, 01:43 PM
50. ### Dice probability with limited reroll

Hello, I'm having difficulty understanding this problem and I was wondering if someone had an answer. Let n = \text{Number of dice} = 3 p_s...

• Replies: 2
• Views: 1,750
03-23-2016, 12:13 PM
51. ### Need help with some Statistics Questions

In a certain population, 18% of the people have Rh-negative blood. A blood bank serving this population receives 95 blood donors on a particular day....

• Replies: 1
• Views: 3,497
03-21-2016, 04:55 PM
52. ### statistics and probability question

Winnipeg has three professional sports teams - the Winnipeg Jets hockey team, the Winnipeg Blue Bombers football team and the Winnipeg Goldeyes...

• Replies: 1
• Views: 2,126
03-17-2016, 08:12 PM
53. ### What is the probability of this improbable event?

Hello all, Let's suppose that we are given 6 chances to draw for two specific numbers. (Though perhaps that 6 chances doesn't really matter?) Let's...

• Replies: 1
• Views: 1,820
03-17-2016, 09:40 AM
54. ### Conditional probability

I am consideriing the following identities: p(s' \lvert s,a) = p(x'_1,x'_2,c' \lvert x_1,x_2,c,a_1,a_2) = \pi(c'\lvert c)p(x'_2 \lvert...

• Replies: 0
• Views: 1,576
03-16-2016, 06:14 PM
55. ### Special Multiplication Rule

Hey I was reading some basic probability problems from my Intro Stats book and thought of a problem to test if I understand it correctly. ...

• Replies: 0
• Views: 1,556
03-16-2016, 02:10 AM

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