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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: 30,320
09-30-2005, 09:44 AM
1. ### 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: 1,183
04-28-2017, 06:10 PM
2. ### 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: 1,671
04-30-2017, 04:26 AM
3. ### 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: 1,014
05-09-2017, 11:34 PM
4. ### 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: 1,397
05-11-2017, 03:32 AM
5. ### 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: 955
05-20-2017, 04:20 AM
6. ### 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: 829
05-27-2017, 09:30 PM
7. ### 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: 700
05-27-2017, 11:34 PM
8. ### 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: 509
05-30-2017, 05:01 PM
9. ### 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: 797
05-30-2017, 11:36 PM
10. ### 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: 1,393
06-04-2017, 02:09 AM
11. ### 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: 1,277
06-05-2017, 02:37 PM
12. ### 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: 718
06-08-2017, 10:29 PM
13. ### conjoint analysis

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

• Replies: 3
• Views: 1,049
06-12-2017, 06:56 AM
14. ### 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: 687
06-15-2017, 04:59 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: 882
06-24-2017, 05:43 PM
16. ### 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: 1,249
07-07-2017, 12:16 PM
17. ### 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: 1,024
07-07-2017, 12:17 PM
18. ### 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: 758
07-09-2017, 04:15 AM

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: 1,054
07-09-2017, 04:45 PM
20. ### 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: 452
07-26-2017, 06:09 PM
21. ### 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: 375
07-27-2017, 06:58 AM
22. ### 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: 379
08-03-2017, 04:29 PM
23. ### 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: 367
08-06-2017, 05:37 AM
24. ### 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: 566
08-07-2017, 02:53 AM
25. ### 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: 561
08-11-2017, 02:01 PM
26. ### 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: 772
09-02-2017, 10:52 AM
27. ### 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: 249
09-20-2017, 02:16 PM
28. ### 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: 200
09-23-2017, 08:20 PM
29. ### 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: 237
09-26-2017, 12:00 PM
30. ### 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: 110
09-27-2017, 08:57 AM
31. ### 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: 147
09-27-2017, 06:52 PM
32. ### 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: 229
09-28-2017, 12:14 PM
33. ### 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: 164
09-29-2017, 09:01 AM
34. ### 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: 161
09-30-2017, 02:37 PM
35. ### 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: 141
10-01-2017, 02:07 AM
36. ### 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: 216
10-03-2017, 12:14 AM
37. ### 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: 111
10-06-2017, 03:41 PM
38. ### 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: 166
10-07-2017, 04:41 PM
39. ### 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: 177
10-08-2017, 05:21 AM
40. ### 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: 192
10-08-2017, 03:51 PM
41. ### 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: 126
10-10-2017, 10:53 AM
42. ### 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: 243
10-14-2017, 02:18 AM
43. ### 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: 73
10-19-2017, 09:36 PM
44. ### 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: 63
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