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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: 30,353
09-30-2005, 09:44 AM
1. ### Understanding independent events.

There is a problem I do not understand: Government data show that 8% of adults are full-time college students and that 30% of adults are age 55 or...

• Replies: 1
• Views: 194
10-20-2017, 09:02 AM
2. ### Tires Probability Question

Question: You recently bought a new set of four tires from a manufacturer who just announced a recall because 2% of that particular brand of tires...

• Replies: 1
• Views: 92
10-19-2017, 09:36 PM
3. ### I tried to calculate a probability problem..pls review my try?

I will be straight and simple on explanation: Abstract: I was playing bingo in a mobile game with my friend, and I wondered, "what is the...

• Replies: 4
• Views: 252
10-14-2017, 02:18 AM
4. ### Measuring strentgh of competing teams

The average number of goals scored per match by Team A when playing on home ground is 2.2 with a standard deviation of 1.3 while the average number...

• Replies: 0
• Views: 130
10-10-2017, 10:53 AM
5. ### Combining two sources of uncertainty

I will use an imperfect dice for simplicity. Let's assume there are two factors that influence the probability of the results obtained from throwing...

• Replies: 2
• Views: 194
10-08-2017, 03:51 PM
6. ### Conditional probability problem

Given P(A1) = .12, P(A2) = .07, P(A3) = .05, P(A1 U A2) = .13, P(A1 U A3) = .14, P(A2 U A3) = .10, and P(A1 A2 A3) = .01 What is the probability...

• Replies: 1
• Views: 182
10-08-2017, 05:21 AM
7. ### Probability summation help

I have the following problem: Two cups, A and B, each contain 1 ml of the same infectious serum. If there is a 30% probability that I will get the...

• Replies: 2
• Views: 169
10-07-2017, 04:41 PM
8. ### multiplication rule with two random events?

Exercise from mathint.com: "The probability that a student passes Mathematics is 2/3 and the probability that he passes English is 4/9 . If the...

• Replies: 1
• Views: 114
10-06-2017, 03:41 PM
9. ### Probability HW help

I need help with these problems. I worked them out, got answers, and checked the back of the book to see if I got them correct. A pair of...

• Replies: 1
• Views: 220
10-03-2017, 12:14 AM
10. ### 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: 146
10-01-2017, 02:07 AM
11. ### determining the most probable permutation of a set

Is there any way to determine the most probable permutation of any given set? For example, given the set of letters SKTANH, is there a way to compute...

• Replies: 2
• Views: 165
09-30-2017, 02:37 PM
12. ### Sales Probability

First post on this forum so I hope to explain my question appropriately. Our company issues catalogs to 3,000 customers. The products in this...

• Replies: 0
• Views: 168
09-29-2017, 09:01 AM
13. ### Determine probabilty of a sampled value being <= 40

Hi all! Brand new poster here, trying to think back to those stats classes that I hated at the time, but now seem fascinating. Ahhhh to be 18 again...

• Replies: 2
• Views: 237
09-28-2017, 12:14 PM
14. ### probobility of a tax inspecton

From our statistics the probability of getting an inspection in any single week is a pprox 1,000 : 1 I was trying to work out the probability...

• Replies: 1
• Views: 152
09-27-2017, 06:52 PM
15. ### Ranking products according to their price and probability of sale

Hello! I have little knowledge of statistics/probability theory, so please bear with me. I was wondering about the following: I have a bunch...

• Replies: 0
• Views: 111
09-27-2017, 08:57 AM
16. ### 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: 4
• Views: 243
09-26-2017, 12:00 PM
17. ### 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: 203
09-23-2017, 08:20 PM
18. ### 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: 254
09-20-2017, 02:16 PM
19. ### 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: 798
09-02-2017, 10:52 AM
20. ### 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: 569
08-11-2017, 02:01 PM
21. ### 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: 571
08-07-2017, 02:53 AM
22. ### 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: 375
08-06-2017, 05:37 AM
23. ### 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: 384
08-03-2017, 04:29 PM
24. ### 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: 381
07-27-2017, 06:58 AM
25. ### 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: 461
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: 1,075
07-09-2017, 04:45 PM
27. ### 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: 767
07-09-2017, 04:15 AM
28. ### 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: 1,044
07-07-2017, 12:17 PM
29. ### 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: 1,257
07-07-2017, 12:16 PM
30. ### 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: 902
06-24-2017, 05:43 PM
31. ### 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: 699
06-15-2017, 04:59 PM
32. ### conjoint analysis

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

• Replies: 3
• Views: 1,060
06-12-2017, 06:56 AM
33. ### 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: 733
06-08-2017, 10:29 PM
34. ### 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: 1,287
06-05-2017, 02:37 PM
35. ### 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: 1,413
06-04-2017, 02:09 AM
36. ### 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: 808
05-30-2017, 11:36 PM
37. ### 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: 518
05-30-2017, 05:01 PM
38. ### 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: 704
05-27-2017, 11:34 PM
39. ### 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: 840
05-27-2017, 09:30 PM
40. ### 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: 964
05-20-2017, 04:20 AM
41. ### 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: 1,403
05-11-2017, 03:32 AM
42. ### 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: 1,023
05-09-2017, 11:34 PM
43. ### 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: 1,679
04-30-2017, 04:26 AM
44. ### 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: 1,191
04-28-2017, 06:10 PM
45. ### 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: 1,339
04-27-2017, 05:38 PM
46. ### Time Series Analysis

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

• Replies: 7
• Views: 7,213
04-18-2017, 03:10 PM
47. ### 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: 1,287
04-18-2017, 02:38 PM
48. ### [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: 1,082
04-18-2017, 09:18 AM
49. ### 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: 786
04-16-2017, 05:23 PM
50. ### 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: 2,243
03-30-2017, 04:11 PM
51. ### 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: 1,349
03-30-2017, 03:42 PM
52. ### 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: 1,205
03-30-2017, 02:06 PM

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