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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: 30,178
09-30-2005, 09:44 AM
1. ### Simple birth-death process

Hello, I am working on a simple birth-death process problem, I have been asked to find the distribution function for the extinction time T. So T...

• Replies: 0
• Views: 4,164
11-08-2009, 05:27 AM
2. ### Almost sure convergence

Let Y_n be a simple symmetric random walk on the integers Z, starting in state 0. Define X_n to be 1 if Y_n=0 and 0 otherwise. I have already...

• Replies: 1
• Views: 4,274
11-22-2009, 11:05 AM
3. ### Is this a negative binomial?

Is this a negative binomial? I understand the solutions. But why am I not getting the right answer using the negative binomial formula? Problem:...

• Replies: 1
• Views: 2,579
BGM
04-04-2011, 02:04 PM
4. ### Application of binomial distribution

Hello all, this is my first post. I am a practicing engineer facing a dilemma. Our resident statistician is out for the MONTH, and I have a deadline...

• Replies: 0
• Views: 2,173
05-16-2014, 08:53 AM
5. ### Probability

Trying to figure how many ways you can have 4 qualifiers out of a group of 11 if order matters and if order does not matter. Anyone help??? Thanks

• Replies: 3
• Views: 2,407
07-07-2009, 07:58 PM
6. ### statistics help

Hey this is my first time doing this but I am makeing a b in the elementary statistics class that I am in I need help finding out how to find the...

• Replies: 5
• Views: 3,082
11-14-2005, 08:24 PM
7. ### Probability: proving

Show that two events A,B are independent if and only if at least one of the following holds i) P(A/B)=P(A) or P(B/A)=P(B) ii) P(A)=0 or P(B)=0

• Replies: 1
• Views: 2,165
DAV
10-04-2008, 03:53 PM
8. ### Find the joint density of Z=X+Y,W=X-Y

Question:Let X,Y be independent random variables with X~Exp(lambda1) and Y=~Exp(lambda2). Find the joint density of Z=X+Y,W=X-Y ...

• Replies: 1
• Views: 5,122
10-04-2008, 09:14 PM
9. ### probability

A congested computer network has a 0.002 probability of losinga data packet and packet losses are independent events. Alost packet must be resent....

• Replies: 1
• Views: 4,573
BGM
09-22-2013, 04:30 AM
10. ### 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: 1,320
12-11-2015, 09:12 PM
11. ### Bound on the difference of two normal cds

Let Xi be univariate normal variables with means mi and standard deviations di, with i = 1,2. Suppose |m1-m2| < e1 and |d1 - d2| < e2. I need an...

• Replies: 2
• Views: 2,833
08-01-2010, 04:30 PM
12. ### Probablility question

If the odds of winning a game are 1 in 10 what are the odds of winning that game three times in a row? Thanks for your help!

• Replies: 0
• Views: 991
02-16-2015, 12:45 PM
13. ### Probability

The Honolulu Advertiser stated that in Honolulu there was an average of 659 burglaries per 300,000 households in a given year. In the Kohola Drive...

• Replies: 1
• Views: 3,884
10-10-2013, 09:27 PM
14. ### I need help with homework please.

The teacher just kind of highlights the basics of it and tells us to read the chapter but the book makes absolutely no sense whatsoever. If someone...

• Replies: 1
• Views: 5,106
02-27-2012, 10:20 PM
15. ### Log normal distribution

Hello all, I would like to find a solution to the following problem. Consider I have a variable X log normally distributed with some expected...

• Replies: 2
• Views: 2,671
07-07-2009, 07:56 AM
16. ### expected value, uniform distribution

Hi everyone, i have a weird question and here it goes, if x is uniformly distributed within the region (0,1]. How should I find E where...

• Replies: 1
• Views: 4,316
07-11-2010, 11:27 AM
17. ### Bayes Theorem application

Prior probabilities if diseases are based on the physician’s assessment of factors such as geographic location, seasonal influences, and occurrence...

• Replies: 1
• Views: 4,890
08-03-2008, 12:55 PM
18. ### Exercise doubt

Hello everyone, I have to do an exercise or probability and i dont know or better if i say im not sure what to do? I know i have three types of...

• Replies: 0
• Views: 2,727
04-12-2011, 08:56 PM
19. ### How to calculate probability of two samples

Hello everyone, Just need advice how to calculate probability of two samples in a 2 x 4 table. so say i have two groups (brown haired people...

• Replies: 0
• Views: 1,573
05-25-2016, 11:25 AM
20. ### calculating expectation and variance

Hi, I wanted to know if i'm on the right track with this problem. So far, for expectation I multiply 15/60 and 12. Not sure if this is correct....

• Replies: 4
• Views: 5,101
02-01-2009, 02:17 PM
21. ### Proving an assertion on sigma-algebras

Hi there :) I have a problem with solving this question: If \mathcal{A} is a \sigma-algebra defined on \Omega and B \subset \Omega is an...

• Replies: 11
• Views: 1,771
11-04-2012, 11:35 PM
22. ### Multinomial Distribution - difficult question - SOS

This has to do with statistics,but the question I don't know the answer to is in probability. I don't know how to solve (b) Please help...

• Replies: 0
• Views: 3,057
07-25-2010, 04:59 AM
23. ### White's Reality Check test

Hi, I have a stock dataset for which I have found the "best" trading rule. Now, I need to find out the probability that this is the best trading...

• Replies: 1
• Views: 3,655
03-30-2012, 03:41 PM
24. ### inverse of the students t-distribution

Dear All, I have a issue about two-tailed inverse of the students t-distribution. I am trying to use calculation for two-tailed inverse of the...

• Replies: 0
• Views: 1,270
10-01-2014, 05:52 AM
25. ### inverse of the students t-distribution

Hi All, I am trying to use calculate for two-tailed inverse of the students t-distribution function presented by Excel functions like...

• Replies: 3
• Views: 1,736
10-03-2014, 12:27 PM
26. ### Conditional probability of functions. Small question

Hey, i was just looking at a question where the question is calculate: P( B(t) =< x| x=B(s) ). That is, calculate the probability that B(t) is less...

• Replies: 0
• Views: 920
05-12-2016, 06:29 AM
27. ### Help with Excell and 1 2 and 3 Standar Deviations

I was given the following data: 45, 89, 78, 85, 47, 25, 56, 99, 100, 98, 65, 65, 65, 56, 35, 53, 58, 57, 54, 89, 78, 75, 75, 72, 83, 84, 75, 82,...

• Replies: 1
• Views: 2,358
10-29-2011, 05:39 PM
28. ### Risk Analysis questions

Hi, I'm new on this forum! I have some question about risk analysis, I'm doing some exercices and I don't understand some points. 1) Limit of...

• Replies: 0
• Views: 1,101
06-10-2016, 03:02 PM
29. ### Probability and time

Hi This is not a homework question, alas school and university are many years ago for me; but I was wondering how you account for time when using...

• Replies: 0
• Views: 2,167
04-14-2007, 06:59 PM
30. ### Dice Throwing

2 dice thrown together for 3 times, what is the probability that for any of the 3 throws, I will get the same number on both dice? Thx ! Andrew

• Replies: 1
• Views: 3,343
12-16-2010, 08:56 AM
31. ### basic probability

My assignment question gives me the following info regarding the probability of system having 3 types of defects (type A1, A2, and A3): P(A1)=...

• Replies: 1
• Views: 2,819
09-28-2008, 06:29 PM
32. ### Method for Bayes spam filtering

I am trying to understand the method for Bayesian spam filtering given here http://en.wikipedia.org/wiki/Bayesian_spam_filtering It makes sense...

• Replies: 0
• Views: 1,677
08-10-2008, 04:35 PM
33. ### Infer the best time of day to call?

I work for a non-profit. We do courtesy calls (no telemarketing) to our existing constituents. Half the calls end up in answering machines. To be...

• Replies: 0
• Views: 2,843
04-06-2009, 06:07 PM
34. ### Quantifying response with variable length history

I have what I hope is a common a statistics problem. In our non-profit organization we occasionally send people direct mail appeals. The goal is to...

• Replies: 0
• Views: 2,134
01-05-2010, 08:05 PM
35. ### Linear Probability Model problem (Binary dependent variables)

y i =a+bD i +u i ,i=1,…,n (LPM equation) Always thank you for your helps! I have a question about Linear Probability Model. You can see the...

• Replies: 0
• Views: 2,017
10-12-2013, 11:34 AM
36. ### Probability and percentiles

An airline has found from past experience that the weight of checked-in baggage items is Normally distributed with mean 13 kg and standard deviation...

• Replies: 0
• Views: 3,352
09-20-2011, 11:50 PM
37. ### Will rounding off Standard Deviation Bins cause error on Histogram?

I am creating a Histogram. I have about 100 points of data and I am using MS Excel's Histogram function to create the "Bins". The data points I have...

• Replies: 4
• Views: 6,653
06-30-2010, 11:34 AM
38. ### distribution of the range of N independent standard normal variables

Let x1, x2, ... xn be independent standard normal variables. (standard normal: normal with 0 mean and variance 1). Let the range R be defined as...

• Replies: 4
• Views: 7,420
02-20-2010, 01:07 AM
39. ### bidding probability

Hi. I am not overly familiar with statistics. I am preparing a manuscript and I need a formula to determine probability. Here is the problem. ...

• Replies: 0
• Views: 2,822
03-14-2011, 02:45 PM
40. ### die probability

Two fair dices are thrown and you are told that the sum of upturned face is equal to 7.what is the probabilty that neither face os equal to 6??is it...

• Replies: 0
• Views: 1,884
05-04-2009, 05:55 AM
41. ### get a distribution of x from y

Hello I have two variables x and y with a roughly linear relationship and good correlation. I have been given a y value and I want to get a...

• Replies: 0
• Views: 1,261
03-13-2015, 12:43 PM
42. ### 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: 2,159
03-02-2017, 04:20 AM
43. ### I think this is binomial???

I was wondering if anyone can solve this problem and let me know how they did it. I am thinking this is a binomial problem, but I haven't been able...

• Replies: 2
• Views: 2,655
07-30-2008, 09:34 PM
44. ### Conditional Probability

I was hoping someone could shine some light on how to go about solving this question.... A dog has a litter of four pups. Assume, as usual, that...

• Replies: 1
• Views: 2,086
07-27-2008, 03:18 PM
45. ### simple random walk

Hi all, I've a question for u... the mathematical model that explains the experiment of tossing a fair coin is the simple random walk,...

• Replies: 1
• Views: 860
BGM
11-21-2012, 11:37 AM
46. ### Probability Question

I am a little confused on what formula I should use here. I understand if you don't want to give me the answer. I just want to be pointed in the...

• Replies: 3
• Views: 2,614
09-18-2010, 08:50 PM
47. ### Normal Distribution problem

Question: an instructor is administering a final examination. She tells her class that she will give an A grade to the 10% of the students who earn...

• Replies: 4
• Views: 2,758
09-28-2010, 11:36 AM
48. ### Normal Distribution

The time for symptoms of fire blight to develop in apple seedlings maintained at a temperature of 25C is normally distributed with a mean of 7 days...

• Replies: 1
• Views: 3,060
09-28-2010, 11:36 PM
49. ### Conditional probability calculation

Please can someone help me with the following question: An urn contains 3 white, 6 red and 5 black balls. Six of these balls are randomly selected...

• Replies: 1
• Views: 7,386
BGM
08-08-2011, 11:16 AM
50. ### Need Help with Practice Exam Question ASAP

Hi. I have an exam coming up and I have no clue on how to do this problem on the practice exam. Can someone help me as soon as you can? Thanks. ...

• Replies: 0
• Views: 2,412
08-06-2007, 08:03 AM
51. ### Joint distribution from multiple marginals

Consider an experiment consisting of a repeated trial with two random Bernoulli (=binary) variables, A and B. Each trial consists of multiple...

• Replies: 4
• Views: 1,707
06-19-2013, 06:21 AM
52. ### really hard prob ques==need major help !!!

Hi guys i really need help on this question, it's so confusing, all help will be greatly appreciated ! =) so here's the question: as part of a...

• Replies: 3
• Views: 3,167
06-09-2008, 09:18 PM
53. ### Need help with probability questions

Democrat Republican Independent Total Male 346 125 24 495 Female 404 ...

• Replies: 2
• Views: 2,757
03-06-2010, 02:44 PM
54. ### How to draw tree diagram

I have the following problem from my home problem. An oil-prospecting firm hits oil or gas on 10% of its drillings. If the firm drills two wells,...

• Replies: 1
• Views: 6,477
03-07-2010, 05:53 PM
55. ### birthday coincidence

Hi, I'm wondering if anyone can help with something that's been puzzling my family for years. I have 3 sons, 2 from my first marriage and one from...

• Replies: 10
• Views: 2,718
08-17-2011, 02:24 PM
56. ### how do design an experiment given a previous one

hello my question is : i have preformed an experiment on an electronic device. the experiment was running the device 110000 cycles in which i...

• Replies: 0
• Views: 2,260
07-27-2012, 09:37 AM
57. ### Order statistics, sample median

Hi! Can you help me with this: we have X=(X1, X2, ... Xn) - iid, Xi ~ N(m,1), I need to prove that distribution of med(X)-X(j) is the same as...

• Replies: 4
• Views: 4,115
04-08-2012, 04:59 PM
58. ### PDF & CDF Integration! Please help!!

Hi everyone, I haven't done integration in a long time, so I just need someone to verify if my calculation is right. The question is: ...

• Replies: 2
• Views: 4,514
08-10-2009, 09:31 AM
59. ### PDF & Cost

Hi everyone, I just need my answer verified. Suppose that the number of word processors x that are purchased each year has the following...

• Replies: 2
• Views: 3,053
08-17-2009, 10:18 AM

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