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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. ### Help analyzing playoff predictions with my grandson

My grandson is a huge football fan. His team, the Seattle Seahawks, made the playoffs. Sadly mine, the 49ers, didn't. The last 2 years, we have...

• Replies: 0
• Views: 1,086
01-08-2016, 01:52 PM
2. ### Is the Poisson probability distribution correctly applied to this problem?

THE PROBLEM The transport company XYZ owns delivery trucks traveling back and forth along 1,000 miles of roads within a state, subdivided into 10...

• Replies: 0
• Views: 1,020
01-07-2016, 03:12 AM

(i) The air in a “clean room” used for the production of electronic devices is cleaned by filtering. The air on the outside of the filters is...

• Replies: 1
• Views: 4,049
01-03-2016, 04:08 PM

Just want to check whether i undertsand something about SD correctly. Am i right in thinking that generally as a sample size increases, its SD...

• Replies: 3
• Views: 1,937
01-01-2016, 07:40 AM
5. ### Help with beginner probability problem?

Hi, I saw this probability question today and I don't understand how the answer was derived. It was about independent events. Could someone...

• Replies: 4
• Views: 1,860
12-31-2015, 06:59 PM
6. ### Probability: Sampling to find defects

Hi, I'm new to the site. We discovered that a process is resulting in a defect rate of 14% for some batches. Each batch of product contains 2,500...

• Replies: 3
• Views: 1,900
12-31-2015, 07:38 AM
7. ### (Bayesian) Frequency and Likelihood Ratio Substitution

I've been trying to learn Bayesian statistics "on my own" and part of how I study is by reading on its application in Court. Recently I've been...

• Replies: 1
• Views: 1,895
12-26-2015, 05:54 AM
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: 1,182
12-23-2015, 05:00 PM
9. ### Probability of winning a jackpot

Hi, i'm new here. I was wondering whats the probability of wining a football prediction jackpot with a win draw or loose options in 13 games...

• Replies: 1
• Views: 1,844
12-22-2015, 05:31 PM
10. ### Probability Function Help

During my college days, I used my statistics classes to help me understand the probabilities of various roleplaying games, including Vampire, the...

• Replies: 0
• Views: 1,207
12-22-2015, 11:29 AM
11. ### Employee commuting question

It takes an average weekday commute of 39 minutes with a Standard Deviation of 7 minutes for the employees to get to work when they use their...

• Replies: 1
• Views: 1,739
12-22-2015, 10:35 AM
12. ### Maximum probability in a grid

Hi, this is my first post, so hello! My problem (and my question) is how can I either express the probabilities calculated below as the...

• Replies: 0
• Views: 2,278
12-21-2015, 06:04 AM
13. ### Inferring the Number of Sides of a Fair Die

Hello, Suppose that Alice has a fair die with N sides, labelled 1..N. Only Alice knows N, and Alice won't tell N to anyone else. However, you may...

• Replies: 1
• Views: 2,834
BGM
12-21-2015, 02:21 AM
14. ### Gender and birth year

Okay this is probably simple but I'm wanting to verify. A co-worker's wife is pregnant with their 8th baby (yeah. It's a lot) and we are all betting...

• Replies: 2
• Views: 4,181
12-19-2015, 10:46 AM
15. ### Expected return

Hello, it has been a couple years since my last statistics course and i need help with a report i am compiling for work. I have a list of 500 or so...

• Replies: 0
• Views: 1,353
12-16-2015, 07:49 PM
16. ### Conditional Probability

http://i.imgur.com/9UELFY5.png Here is the problem in question. I have the answers for both of these already,but I am not sure I have 2b correct. ...

• Replies: 5
• Views: 1,240
12-14-2015, 05:18 PM
17. ### Normal Distribution

Suppose that in an apartment building run by the Probandstat rental company, the inhabitants's weights follow a normal distribution with mean 73.0...

• Replies: 1
• Views: 1,060
12-13-2015, 12:10 PM
18. ### Probability and Averages

The prompt is this. "The prices of power tools manufactured by Whammo are known to be normally distributed with a mean of \$1200 and a standard...

• Replies: 1
• Views: 1,595
BGM
12-11-2015, 09:38 PM
19. ### Sampling distribution of the sample proportion.

A random sample of 20 students is selected. What is the probability that the sample proportion exceeds 75%, i.e., more than 15 students (out of 20...

• Replies: 1
• Views: 1,473
12-11-2015, 09:12 PM
20. ### Probability of a Poisson Distribution without t given problem

This is on my final exam study guide for statistics. I have absolutely no idea how to do it Problem 1: Valerie Variance is taking her "no-time...

• Replies: 1
• Views: 1,491
12-06-2015, 02:01 PM
21. ### expectation of number of streaks

Ok so i have this question and i dont even knownwhere to begin. An unfair coin with the probability of p to get a head is tossed n times. (n>6). A...

• Replies: 6
• Views: 2,844
BGM
12-04-2015, 11:58 PM
22. ### Probability of an event occurring 5 times??

Hi all I have recently placed a bet with a bookmaker concerning the number of days Sydney will exceed 35C in summer. Summer has 90 days and the...

• Replies: 3
• Views: 2,150
12-04-2015, 04:53 AM
23. ### Three (or more) normally distributed variables

Hi I have three variables, X, Y and Z with all different means but same standard deviation. All are normally distributed. It could be four in some...

• Replies: 3
• Views: 1,526
12-03-2015, 04:18 PM
24. ### Finding probability from Moment Generating Functions

I am stuck on part 3 of this question. I am given the following moment generating function mx(t) e^(4e^t-4) 1) identify the distribution and...

• Replies: 2
• Views: 1,316
12-02-2015, 06:34 PM
25. ### bayesian statistics

I have a large amount of data, given totals for every hour over a year period for the following columns: # of Jams Jam event time in minutes # of...

• Replies: 0
• Views: 1,321
12-01-2015, 01:23 PM
26. ### Expectation of random variable

Hey guys, I have stumbled upon this problem, and I've tried solving it by looking at it as a Binomial distribution, but i just don't see the right...

• Replies: 1
• Views: 3,009
BGM
11-25-2015, 11:06 PM
27. ### Probability of seeing the same token number

Hello, This is well beyond my understanding and I am hoping there is someone out there that can help. I have looked on the forum for an answer but...

• Replies: 0
• Views: 1,636
11-25-2015, 08:08 AM
28. ### Calculating special lottery odds

#s out of a bag! Hello, I would appreciate anyone's help in this problem: There are 11 balls in a bag numbered 0-10. You get 6 picks out of...

• Replies: 4
• Views: 1,385
BGM
11-24-2015, 12:54 AM
29. ### Probability During Sampling

I work a biomedical lab, but I haven't had a statistics course in quite some time. It's important that our data have a p < 0.05. The question can...

• Replies: 3
• Views: 2,035
11-22-2015, 01:31 PM
30. ### Unobserved effect integrated out

The question is whether the following argument holds: I start with some model \mu_1(x,c) = E such that E = \int_c E p(c\lvert x) dc I then...

• Replies: 0
• Views: 1,272
11-22-2015, 12:33 PM
31. ### College Football Bowl Pick'em Pool Probability

I'm creating an excel spreadsheet for our office pool. If you're not familiar with the College Bowl Pick'em game, the rules are as follows... ...

• Replies: 2
• Views: 2,804
11-21-2015, 10:47 AM
32. ### Probability Density Function and Cumulative Distribution function

Suppose you have a random variable X and Y with Joint PDF define by: f(x,y)= Ky -1<= x <=1, 0<y<|x| f(x,y) = 0 otherwise I found K=3. ...

• Replies: 2
• Views: 1,426
11-16-2015, 08:51 PM
33. ### Gross up sample to population?

Hi We emailed out a survey to 50 random customers. So far we received 10 responses back. For one of the Yes/No questions, question 7, we got 10...

• Replies: 0
• Views: 1,246
11-15-2015, 07:56 PM
34. ### Football (Soccer) Probability

I am having some difficulty in understanding some information that I have been sent. I have been given the following information about two...

• Replies: 2
• Views: 1,672
11-15-2015, 02:20 PM
35. ### #s out of a bag!

Hello, I am new to the forum, and have joined because the following question has stumped me. There are 11 balls in a bag numbered 0-11. You...

• Replies: 0
• Views: 1,368
11-13-2015, 06:01 PM
36. ### Basic Probability help required.

Hi, Im new to the site so apologies if I haven't posted the question correctly. But here goes, I have been given this question as an example to...

• Replies: 0
• Views: 985
11-13-2015, 09:48 AM
37. ### correct update of bayesian posteriors

the question looks a bit artificial but I simply tried to get rid of useless details. There are two persons, A, and B. they each got a number, a...

• Replies: 1
• Views: 1,369
BGM
11-12-2015, 11:58 PM
38. ### Powerball Jackpot

Hello, I need help with my homework! I'm not really good at probability but I really want to learn, if its possible to help me with the answer and...

• Replies: 0
• Views: 1,372
11-11-2015, 10:16 PM
39. ### Tricky question

Here's the problem: Let P(k) be a random draw of integers between 1 and k (inclusive). Assume you repeatedly apply P, starting at 10^1000. What's...

• Replies: 1
• Views: 1,833
BGM
11-11-2015, 09:31 PM
40. ### Which Formula do I Need?

Hi, I've been scouring the internet for answers but I have very little knowledge when it comes to probability so I need help. I have 10 trials,...

• Replies: 2
• Views: 1,561
11-11-2015, 04:27 AM
41. ### Random Variable probability question. Help for a non stastician

Hi everyone, I have a stat question. lets assume I have five possible categories ( 1,2,3,4,5) for a quality issue. since 8 years, a total of...

• Replies: 2
• Views: 1,903
11-08-2015, 05:24 AM
42. ### Average time needed..

Dear Talk Stats users, First of I'm glad I found this forum and to be part of it! To keep a long story short: I've got a problem with an exercise...

• Replies: 2
• Views: 1,503
11-02-2015, 01:27 PM

Hey everybody, Sorry this is my first time on this forum, I just have one question that my colleagues and I are interpreting in essentially...

• Replies: 2
• Views: 1,615
11-01-2015, 04:38 AM
44. ### Shared car usage

Given a pool of C cars available to use by P people, the arrival rate of drivers to borrow cars is r, and the average trip time is t, how often will...

• Replies: 1
• Views: 1,106
BGM
10-31-2015, 02:47 AM
45. ### Sampling in a bounded region by using a MCMC approach ensuring samples uniformity

Hi everybody, tired of waiting any longer for your remarks. Thank you all. P.

• Replies: 0
• Views: 1,343
10-30-2015, 07:16 AM
46. ### Probability of duplicates

Suppose I have a bag of N balls numbered from 1 to N. If I draw K balls at random with replacement, how do I calculate the expected number...

• Replies: 2
• Views: 1,415
10-30-2015, 01:24 AM
47. ### Help with Pathway Probability Problem

I am completely lost on how to solve this problem. Any hint would help There is a lost tourist in New York. The streets in New York run east to...

• Replies: 1
• Views: 2,352
10-29-2015, 09:03 PM
48. ### Normal Average versus Weighted Average

I'm taking a self-study course from "The Great Courses" called "Joy of Numbers". I'm on the lesson "Joy of Mathematical Games" and am confused by the...

• Replies: 1
• Views: 1,038
10-29-2015, 02:07 PM
49. ### Samples

Hello, maybe there is someone here who can answer the following question because I don not understand the basic behind it. 1. How do I find...

• Replies: 1
• Views: 1,526
10-28-2015, 09:55 AM
50. ### Probability of seeing given wild animal in area

I would like to know how to try to calculate the probability that given individual wild animal is seen on area A when going through it via path, when...

• Replies: 0
• Views: 2,504
10-24-2015, 08:00 PM
51. ### urgent help need mean variance

Hi everybody, If a random variable X is distributed in , can we say E>var? If yes, can you please give me a reference which is stated that or...

• Replies: 1
• Views: 1,506
BGM
10-22-2015, 12:51 AM
52. ### conditional binomial is a poisson distribution

Hi, I'm fighting with this problem for a while. There is something important I'm missing So the problem goes like this X~Poisson(lambda) and Y|X=k...

• Replies: 13
• Views: 23,011
10-21-2015, 04:01 PM
53. ### Stock market returns, Normal and Log-normal distributions - question

I wondered if anyone could please help me with the following. - I'm looking at expected stock market returns for a hypothetical portfolio - We...

• Replies: 1
• Views: 2,666
10-21-2015, 07:56 AM
54. ### Correlation between data and people

Hi all, I need your help for this problem. I have to understand the probability to identify the person of a team gives me the product dirtier....

• Replies: 6
• Views: 1,755
10-21-2015, 06:19 AM
55. ### probability question

Hello i need your helps in solving this question we have 20 boys an 10 girls, and i want to divide them to 5 groups, six in each group..(order...

• Replies: 4
• Views: 2,470
10-21-2015, 03:34 AM

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