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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: 30,355
09-30-2005, 09:44 AM
1. ### Probability of Events - Accident Stats

I am trying to figure out the likelihood that a series of accidents is either indicative of a problem or not, in other words how rare is this series...

• Replies: 1
• Views: 6,004
10-08-2010, 05:27 PM
2. ### Conditional probability problem

Hi, So here's the problem I've been working on for several hours now: "Deer ticks can be carriers of either Lyme disease or HGE. Based on a...

• Replies: 7
• Views: 6,003
02-06-2012, 09:27 PM
3. ### Reading z-tables when you know the probability

I'm having trouble reading z tables. If anyone can help I'd be thankful as I feel I can't move on until I know how to do this. One of the...

• Replies: 2
• Views: 5,993
12-03-2010, 10:40 AM
4. ### P value interpretation

I'm reviewing a report where two populations were compared using a two-tailed T test. I am wondering if this sentence is true: For example, a P...

• Replies: 3
• Views: 5,980
01-10-2011, 05:02 PM
5. ### Correlation of the product of 2 multivariate normal variables...

hello everyone! i've got a quick theoretical question that i'm gearing towards a simulation exercise but i need to get my stuff right first... ...

• Replies: 12
• Views: 5,978
07-28-2011, 01:33 AM
6. ### Finding UNcondintional Mean and Variance of U

Good evening! I am working through this problem and searched online and found the solution, which makes a lot of sense, but am not quite sure...

• Replies: 8
• Views: 5,966
02-03-2013, 09:43 AM
7. ### Percentage overlap of two gaussian distributions

I would like to know how to calculate the overlap between two one dimensional gaussian distributions. Here is my approach: 1) Find the point, x*,...

• Replies: 0
• Views: 5,962
04-23-2008, 07:15 PM
8. ### Hypergeometric Random Variable help!

Here's the question, I've tried all the formulas given to me in the chapter, and none are working. I'm guessing to use the mean and...

• Replies: 4
• Views: 5,959
10-24-2011, 03:01 PM
9. ### Permutation Problem - help me understand pls!

I am reading this example about permutation and can't understand how to go about rationalize it. Example: Suppose that 2 anthropology, 4 computer...

• Replies: 1
• Views: 5,932
01-31-2007, 06:17 AM
10. ### Black Jack Anyone?

Using the hypergeometric probability function below: P(x) = (r/x)((N-r)/(n-x))/(N/n) P(x) = probability of x success in n trials n = number of...

• Replies: 3
• Views: 5,930
02-13-2006, 03:02 PM
11. ### Project ideas for probability n stats

I needed ideas to prepare a project which has application of probability or stats in some form. The project contains a significant programming part...

• Replies: 0
• Views: 5,924
09-23-2010, 12:04 PM
12. ### Probability of events occuring at the same time?

Hi! I'm having a bit of trouble calculating a probability as my statistics are a little bit rusty. Basically, I have 25 independant Wireless G...

• Replies: 4
• Views: 5,915
07-24-2009, 11:24 AM
13. ### comparing two Poissonians

What is the proper statistical test for the following: I know A1 and A2 to be Poisson distributed with (unknown) means x1 and x2. I have a single...

• Replies: 20
• Views: 5,912
06-23-2010, 12:36 PM
14. ### Probability

Ok I am very new to stats and am very confused. I went to the examples board and now am even more confused. Here is the problem. Ok they offer a...

• Replies: 13
• Views: 5,907
11-15-2005, 03:11 PM
15. ### Normal distributions

I have been using my TI 84 Plus Silver Edition calculator to try and figure this out with no luck :-( Can anyone help? Assume that the heights of...

• Replies: 7
• Views: 5,897
07-15-2010, 01:58 PM
16. ### probability problem

For detecting a disease, a test gives correct diagnosis with probability 0.99. It is known that 1% of the population suffers from this disease. If a...

• Replies: 5
• Views: 5,890
03-10-2011, 08:19 AM
17. ### Silly baseball question.

I know I'm new, but it's not really my intention to just jump on here and post something and then never post again, honestly I don't know why I...

• Replies: 2
• Views: 5,883
04-22-2007, 08:57 PM
18. ### test question

At a large department store, the average number of years of employment for a cashier is 5.7 with a standard deviation of 1.8 years and the...

• Replies: 1
• Views: 5,876
10-17-2010, 11:18 PM
19. ### First forum visit ever. Questions

I'm taking an online statistic course and am having a very hard time with it. I think my biggest problem is setting up the problems. Could someone...

• Replies: 2
• Views: 5,871
06-24-2008, 12:05 PM
20. ### Two part PMF for a Joint Distribution problem

Suppose X and Y have the following joint distribution p(x, y) = c(x^2 + y^2). For x = -1, 0, 1, 3 and y = -1, 2, 4: A) Find the value of c that...

• Replies: 2
• Views: 5,869
12-08-2010, 10:26 AM
21. ### Standard deviations and profits?

So this is another question I attempted to solve but was stuck on the 2nd part of it: A store knows that the number of pies sold each day varies...

• Replies: 1
• Views: 5,860
02-25-2008, 01:16 PM
22. ### Help with Conditonal Probability

I think this is a classic problem. :) Oscar has lost his dog in either forest A (with a priori probability 0.4), or in forest B (with a priori...

• Replies: 1
• Views: 5,854
07-03-2007, 01:08 PM
23. ### Joint Probability Distribution

Joint Probability Distribution for Random Variable X and Y? Three cards are drawn without replacement from 12 face cards (Jacks, Queens, and Kings)...

• Replies: 3
• Views: 5,849
BGM
03-10-2011, 04:56 AM
24. ### birth defects - probability

I am new and really stuck with this one: Analyzing cases of a rare congenital defect>>>>>>>>>>>>> • 1 female in 30 in the population carries the...

• Replies: 3
• Views: 5,844
04-25-2008, 01:26 PM

Hello, I am trying to find an unbiased estimator for E(X/Y), where X is Normal(mu_1,sigma_1) and Y is Normal (mu_2,sigma_2). Does anyone happen...

• Replies: 1
• Views: 5,843
03-19-2010, 04:38 PM
26. ### Simple marginal effects after probit

So I have cannot find pretty much any basic information on marginal effects after probit in STATA on the net or my textbooks, so any help would be...

• Replies: 0
• Views: 5,842
sif
11-29-2010, 08:39 PM
27. ### Homework Problem- Normal Distribution/Standard Deviation

Hi there, I've been working through my homework problems and this one has totally stumped me in terms of where to start in order to complete the...

• Replies: 6
• Views: 5,839
08-14-2011, 07:40 AM
28. ### finite variance

Hi there, if X is a random variable and all we know is that it has finite variance. Can we say that X is bounded? If not what is the meaning of...

• Replies: 2
• Views: 5,835
04-25-2010, 12:36 AM
29. ### distribution function of the division of two variables

Hello Probably this is a silly question, but its is being resulting a non obvious task for me. Any isight would be welcome. I have a continous...

• Replies: 1
• Views: 5,831
07-20-2007, 11:44 PM
30. ### Random Variable/Expected Value Problem (Profit)

I thought I'd gotten the hang of these, but then the newer problems had different value types that needed to be used. This particular question asks:...

• Replies: 2
• Views: 5,820
BGM
11-03-2011, 11:57 PM
31. ### probability

a pharmaceutical firm claims that a certain medication is 92% effective in relieving arthric pain. if ten people who suffer from arthritis are...

• Replies: 16
• Views: 5,819
09-21-2006, 08:28 AM
32. ### Specific set number generator

Hi, I`m totally newbie in statistic and i would like to ask for help. I need to write a program for generating a list of numbers from a specific...

• Replies: 1
• Views: 5,803
12-11-2009, 11:19 PM
33. ### Poisson distribution and moment generating function question

This is a problem my professor assigned for homework. He said if we can't do it, it's not a big deal; it's a difficult problem. I'd still like to...

• Replies: 3
• Views: 5,800
02-05-2012, 04:45 PM
34. ### Conditional Probability

I've been working on this one for the last 3 days to no avail. The problem is this: "A statistics professor wants to ensure that she is not late...

• Replies: 1
• Views: 5,798
08-15-2006, 09:59 PM
35. ### Probability: Sums and Products of Random Variables

Suppose that X is uniformly distributed on (0,2), Y is uniformly distributed on (0,3), and X and Y are independent. Determine the distribution...

• Replies: 1
• Views: 5,788
05-11-2011, 09:53 PM
36. ### Can you get me started?

A television store owner figures that 45% of the customers entering the store will purchase an ordinary television set, 15% will purchase a plasma...

• Replies: 7
• Views: 5,783
11-09-2006, 07:39 AM
37. ### Binomial Distribution

A company starts a fund of M dollars from which it pays \$1000 to each employee who achieves high performance during the year. The probability of...

• Replies: 3
• Views: 5,783
02-08-2014, 02:10 PM
38. ### Probability exam questions with worked-out solutions

Students can download from http://personal.vu.nl/h.c.tijms/ExamQuestionsUP.pdf a collection of more than 150 probability exam questions with fully...

• Replies: 0
• Views: 5,779
04-26-2013, 03:53 AM
39. ### Normal approximation and also a problem with hypothesis testing

I need a little help with the formulas here. I’m not sure if I am doing this right. Records show that 29% of all payments to a mail-order company...

• Replies: 0
• Views: 5,772
11-21-2009, 09:47 PM
40. ### how many seating arrangements are possible

Delegates from 8 countries (G8): U.S., U.K., France, Germany, Italy, Russia, Japan and Canada are to be seated around a circular table. How many...

• Replies: 2
• Views: 5,770
09-29-2010, 08:20 PM
41. ### probability

regarding poisson, how would you go about solving if a question reads: A hospital has noted that they admit an average of 8 patients per hour. ...

• Replies: 2
• Views: 5,766
09-18-2005, 11:57 AM
42. ### Moment Generating Function

If the joint moment generating function of X and Y is M X,Y (t1, t2) = 6 / (1-t1) * and X,Y are the times that required for two tasks to be...

• Replies: 16
• Views: 5,763
02-23-2012, 01:13 PM
43. ### Normal approximation

Given n=200 and p = 0.01 (probability that you will find a customer spending less that \$100). Find the probability that you won't find any that spend...

• Replies: 10
• Views: 5,759
03-20-2011, 04:05 PM
44. ### Sequence of chess games

Person A and Person B play a sequence of chess games. S=(A wins a game) and the outcomes of the successive games are independent with P(S)=P(F)=0.5...

• Replies: 9
• Views: 5,755
10-24-2010, 07:25 PM
45. ### Probability and Sampling Distribution Question

Just before a city referendum on a school budget, a local newspaper polls 400 voters in an attempt to predict whether the budget will pass. Suppose...

• Replies: 2
• Views: 5,747
03-31-2008, 06:36 PM
46. ### Analyzing test results- Normal Distribution

I’m trying to compare my grade on my Algebra exam to my fellow students using the normal distribution. Here are the results of the exam: ...

• Replies: 0
• Views: 5,744
06-20-2006, 10:02 AM
47. ### Intensity Matrix

Hi, sorry to keep harassing everyone like this, but I'm stuck again. It's the same setup as the last question, but this time it's asking about the...

• Replies: 2
• Views: 5,735
05-06-2010, 06:14 AM
48. ### calculate the probability of accident.

Suppose there are seven(distinct) accident occurs in a week. What is the probability that all accidents are occurred on the same day? Pls explain in...

• Replies: 6
• Views: 5,732
12-25-2011, 06:15 PM
49. ### Uniform Dist

Suppose X,Y are uniformly distributed over the unit circle. Let R = sqrt(X^2 + Y^2) and theta=arctan(Y/X). What is the joint pdf of (R, theta)?...

• Replies: 1
• Views: 5,722
BGM
10-28-2010, 07:24 AM
50. ### Sampling distribution of standard deviation

Hi, I need some help, please. If X_i~N(mu, s^2), what is the distribution of sample standard deviation , I mean, with n-1 degree of freedom? ...

• Replies: 3
• Views: 5,718
05-04-2011, 02:58 PM
51. ### Simulate truncated exponential

Hi, I have to simulate from Exp(1) which is truncated below by 0.5 using the method of inversion. That is simulate a random variable X~Exp(1)...

• Replies: 1
• Views: 5,717
03-18-2009, 12:43 PM

A machine fills containers with a particular product. The standard deviation of fillign weights is known from past data to be .6 once. if only 2% of...

• Replies: 1
• Views: 5,713
11-11-2009, 11:27 AM
53. ### Prove finite expectation value

Hallo, I've got a problem with a proof: I should prove that a r.v. X (>=0) has a finite expectation value iff sum_{i>=1}P(X>i) is finite. I...

• Replies: 1
• Views: 5,711
03-20-2010, 12:48 PM
54. ### Lottery probability. What if a friend wins?

As a programmer I've worked a little bit with statistics, but not much with probability. An interesting question has come to mind this week, and it...

• Replies: 8
• Views: 5,709
03-03-2011, 04:53 PM

Before ya slam me let me explain. I foolishly took an online statistics course. I will be failing this class... there is nothing I can do to avoid it...

• Replies: 3
• Views: 5,692
11-20-2008, 03:37 PM
56. ### integral of probability density function

Hi, I apologize for the almost certainly stupid question. I'm sure somebody must have asked it before but I have searched and cannot find an...

• Replies: 2
• Views: 5,687
06-08-2009, 04:00 PM
57. ### "with and without replacement" question

hi, thanks for taking a look. im stumbling on trying to understand one question. the problem is: a box of nine gloves contains two left handed...

• Replies: 1
• Views: 5,685
BGM
09-15-2009, 12:39 PM
58. ### Probability Problem

Hi all, I have been trying to come up with the correct answer for part c) of this question with no luck. A gumball dispenser has 38 orange...

• Replies: 4
• Views: 5,684
02-22-2008, 04:09 PM

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