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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: 29,561
09-30-2005, 09:44 AM
1. ### Help with what a question is asking

I know how to calculate probabilities, but I want to make sure that I am understanding the question. "What is the probability that the Dow Jones...

• Replies: 3
• Views: 5
Today, 09:17 AM
2. ### What is the probability a particular sequence of 6 letters appearing in 13?

What is the statistical probability a particular set of 6 letters appearing in a 13 alpha-numerical sequence in the case of: ...

• Replies: 1
• Views: 128
09-23-2017, 08:20 PM
3. ### Simple Set THeory/Probability Problem

Hello all, I'm very new to statistics as well as this forum, so please bear with me. I've tried solving this for about 30 minutes now and I've...

• Replies: 4
• Views: 171
09-20-2017, 02:16 PM
4. ### Not Statistically Significant.... or is it?

I am comparing 2 groups to see if there are differences in GPA across 4 years of high school. Group A has a higher mean for all 4 years, BUT... the...

• Replies: 18
• Views: 586
09-02-2017, 10:52 AM
5. ### Kruskal Walis & Wilcoxon test

Hi all, it would be so kind if someone could explain to me as to why both equations, Kruskal Walis and Wilcoxon, consists of the number 12? The...

• Replies: 1
• Views: 475
08-11-2017, 02:01 PM
6. ### urgent question on the mode, median, variance and mean

We roll two (unbiased) dice and let X and Y be the two numbers that appear. Find the mode, the median, the expectation, and the standard deviation...

• Replies: 1
• Views: 479
08-07-2017, 02:53 AM
7. ### a fair gambling game

You want to invent a gambling game in which a person rolls two (unbiased) dice and is paid some money if the sum is 7, but otherwise he loses his...

• Replies: 1
• Views: 264
08-06-2017, 05:37 AM
8. ### Prob of high risk loans defauting, student text question

Hi, first of all thanks for reading this. I'm 47 and trying to teach myself Stats from an excellent textbook as part of my course in maths and...

• Replies: 3
• Views: 308
08-03-2017, 04:29 PM
9. ### calculate intersection sets of cell clones in samples?

Is it possible to calculate the probability of intersection sets in this setting? I have 44000 different cell clones in sample O, I don´t know how...

• Replies: 0
• Views: 317
07-27-2017, 06:58 AM
10. ### get number of participants from given probability

Hi! I have a pool of participants - defined number of tournaments (competitions) - defined participants per tournament (partPerTour) Of...

• Replies: 1
• Views: 354
07-26-2017, 06:09 PM

Hi, I'm stumped on this set of questions. I know it must be very simple, but I can't seem to crack it... Anyone able to give me some direction/Excel...

• Replies: 1
• Views: 895
07-09-2017, 04:45 PM
12. ### A Puzzling Probability Problem

Hello everyone. I have encountered these problems. I tried to answer them, but I'm not sure if they are correct.:: I would be very grateful if...

• Replies: 4
• Views: 632
07-09-2017, 04:15 AM
13. ### Minimum CDF of non-independent random variables

How can I find the CDF for F_{X,Y}={x,x} if X,Y are not-independent. In other words, what will be Pr{min(X,Y)<x} if X,Y are not-independent? If I...

• Replies: 1
• Views: 815
07-07-2017, 12:17 PM
14. ### Random Vectors and their inner product.

Let's say i have two random vectors, X and Y, both of length n. The elements of either vector are not independent, and X and Y themselves are not...

• Replies: 1
• Views: 1,081
07-07-2017, 12:16 PM
15. ### probability of getting 4 aces when 5 cards are drawn

Question: Find the probability of getting 4 aces when 5 cards are drawn from an ordinary deck of cards. Which of the followings is the correct...

• Replies: 1
• Views: 724
06-24-2017, 05:43 PM
16. ### Card Probability Problems

Scenario: If you have a standard deck of 52 cards and you draw 2 of those cards without replacement, what is the probability of: 1) P(getting a...

• Replies: 1
• Views: 578
06-15-2017, 04:59 PM
17. ### conjoint analysis

Hi how i can ask for which situation to use conjoint analysis?

• Replies: 3
• Views: 936
06-12-2017, 06:56 AM
18. ### Essay Grouping Problem

if i have 8 essay topics (a,b,c,d,w,x,y,z) and they will be randomly grouped into 2 groups of 4, what is the probability of getting group (a,b,c,d)?...

• Replies: 1
• Views: 621
06-08-2017, 10:29 PM
19. ### Probability of Occurance

Hi I'm new to probability and need help with what is probably a simple equation for you guys. I am trying to calculate the probability of even A...

• Replies: 3
• Views: 1,128
06-05-2017, 02:37 PM
20. ### probability of 3 in a row

Hi the probability of 1 occurance is about 1 in 10 what i would like to calculate is the probability of 3 of these happening in a row at any time...

• Replies: 3
• Views: 1,026
06-04-2017, 02:09 AM
21. ### Probability of Sampling Error Assistance

Hello! I am working on a mini project and am stuck on the third question! I think it's how the question is phrased that is throwing me off..? I...

• Replies: 0
• Views: 667
05-30-2017, 11:36 PM
22. ### Probability of H/T Score AND F/T Score Being Specific Scores...

Hi All, Just trying to answer something in my mind... If I had calculated (using poisson) the chances of various scores occurring in a football...

• Replies: 0
• Views: 424
05-30-2017, 05:01 PM
23. ### decile

hi experts. I 'd like to ask about cluster analysis. to identify the group of customer that which group will have high potential to cancel the...

• Replies: 0
• Views: 589
05-27-2017, 11:34 PM
24. ### How to calculate posterior probabilities (Bayes related, I think)

I graduated Uni 16 years ago and generally have no problems with the math and stats I need in my life ... until today. I am breeding horses and there...

• Replies: 2
• Views: 689
05-27-2017, 09:30 PM
25. ### Simple Problem

In a game, you: - Win 70 in scenario 1 - Win 4 in scenario 2 - Lose 20 in scenario3 - Lose 80 in scenario 4 For it to be a fair game, what...

• Replies: 1
• Views: 867
05-20-2017, 04:20 AM
26. ### Distribution of a random sum of random non-iid variables

I'm trying to find the probability distribution of a sum of a random number of variables which aren't identically distributed. Here's an example: ...

• Replies: 1
• Views: 1,232
05-11-2017, 03:32 AM
27. ### Interpretation of probability density function - uniform distribution

Dear all, I'm having some problems in the interpretation of the probability density function. Until now I thought that f(x) for a continuous...

• Replies: 1
• Views: 889
05-09-2017, 11:34 PM
28. ### Chi² distribution link with standard normal distribution?

Hello, The chi² distribution is the sum of n random standard normal variables. It's used for example to know if a distribution fits the uniform...

• Replies: 4
• Views: 1,541
04-30-2017, 04:26 AM
29. ### Help please on calculating probabilities of certain coin-flip outcomes

Hi all, (Note: this is not a request for help with "homework"; I'm 51 years old and am trying to learn on my own, through my own "assignments" to...

• Replies: 5
• Views: 1,034
04-28-2017, 06:10 PM
30. ### Basic Statistics

I am sure this is a basic problem that is easily solvable, however, I have not been in a Statistics class in a little over 31 years and have all but...

• Replies: 4
• Views: 1,146
04-27-2017, 05:38 PM
31. ### Time Series Analysis

Hello All. I am a new member to this forum. I wish to understand a couple of papers ...

• Replies: 7
• Views: 6,692
04-18-2017, 03:10 PM
32. ### A puzzling problem

Hello all, I am posting here looking for help on solving a probability problem I have been struggling with for 2 days. It has been several years...

• Replies: 3
• Views: 1,115
04-18-2017, 02:38 PM
33. ### [Discrete Probability Function] P(X²=1)= P(X=1) U P(X=-1)?

I would like to know if this following form of interpretation is correct: ========================== Suppose I have a discrete probability...

• Replies: 1
• Views: 918
04-18-2017, 09:18 AM
34. ### Hypothetical example of using probability to control emotions in business

Imagine a company where there are two principals. The first person is the founder and owner of the company. The second person is nearly a partner...

• Replies: 0
• Views: 641
04-16-2017, 05:23 PM
35. ### Conditional Probability

I have some ambiguity in the following problem Three cards are drawn in succession from a deck without replacement. find the probability...

• Replies: 6
• Views: 2,049
03-30-2017, 04:11 PM
36. ### Exponential Distribution Conditional Probability

Hello, I have been working with Exponential Distribution problems, but have not come across a problem like this one with both Exponential...

• Replies: 1
• Views: 1,140
03-30-2017, 03:42 PM
37. ### ordering Probabilty in coin tosses

Hi Guys, First post here so please accept my apologies if this question was posted before. This is baffling me for quite a few days now and I...

• Replies: 4
• Views: 1,048
03-30-2017, 02:06 PM
38. ### Probability with Permutations Question

Hello! This is my first time posting and I would appreciate any help at all! So the problem I'm working on has to do with randomly choosing letters...

• Replies: 4
• Views: 895
03-30-2017, 11:58 AM
39. ### Conditional Probability

Dear all Please help in solving the following problem. A large industrial firm uses 3 local motels to provide overnight accommodations for its...

• Replies: 1
• Views: 1,068
03-29-2017, 06:59 AM
40. ### Probability and roundoff errors

Hi, I work on a real life problem with roundoff errors and found a glitch in my thinking. If someone knows how to solve this problem I appreciate...

• Replies: 1
• Views: 1,261
03-23-2017, 10:38 AM
41. ### Union and intersection

43% of adults are stockholders. 75% of adult stockholders have some college education. 37% of adults have some college education. An adult is...

• Replies: 5
• Views: 1,788
03-18-2017, 06:05 PM
42. ### Urgent: Probability of having Lyme Disease and Bayes theorem

I recently found a deer tick on me (had been there for several days). I have no symptoms. My Dr. says I could ignore it or take a course of...

• Replies: 14
• Views: 1,669
03-13-2017, 06:02 PM
43. ### Confidence levels

Hi, I need to calculate the confidence levels that I have enough staff at any point in time to service up to 6 tills in a supermarket. I have a...

• Replies: 3
• Views: 1,714
03-07-2017, 10:33 PM
44. ### CDF of a PDF with a negative power

I need to solve the following problem: For a marine hull insurance policy, a claim occurs with probability 0.DD, where DD represents the two...

• Replies: 3
• Views: 2,044
03-04-2017, 12:06 AM
45. ### Probability of an Event...in a certain Time!

Hi Guys, This is probably a basic question for you lot...but let's say I had calculated the chance of an event happening (in this case lets say a...

• Replies: 4
• Views: 1,777
03-02-2017, 05:06 PM
46. ### bayes for generating new data

I am estimating a tree inventory for a city. I have already measured the heights and identified the species for about 1000 trees in some areas of...

• Replies: 3
• Views: 1,916
03-02-2017, 04:20 AM
47. ### Roulette - expected value

Hello, I want to calculate the expected pay-out of european roulette spins. Particularly, I want to know what is the expected pay-out at the...

• Replies: 7
• Views: 2,359
03-02-2017, 04:06 AM
48. ### Probability of developing a lung cancer disease

I need to solve this problem: A cohort study is done to assess the impact of smoking on lung cancer. In this study, a large representative sample...

• Replies: 5
• Views: 1,825
03-01-2017, 06:30 PM
49. ### Different solutions when using direct calculation and Chebychev's inequality

Hi all, I have a question that I can't find answer to: I have 10 random variables X1, X2....X10 which are all independent and exponentially...

• Replies: 1
• Views: 1,797
02-23-2017, 06:05 PM
50. ### Fixing the low value and high value in a probabilistic simulation

Hi, When doing repeated random sampling in a monte carlo method, is there a defined procedure to fixing the low value and high value of the...

• Replies: 10
• Views: 2,321
02-23-2017, 03:33 PM
51. ### Probability of storm surge given parameters for hurricanes.

I've been working through some statistics problems and could use a little guidance on how to arrive at the right answer (and more importantly, why...

• Replies: 4
• Views: 1,894
02-23-2017, 01:00 AM

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