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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: 30,206
09-30-2005, 09:44 AM
1. ### Can you really solve for an MLE given a fictitious distributi

to estimate MLE, you need more than one observation, right? What if you don't have a density function? (It's a fictitious disitrubtion)

• Replies: 3
• Views: 2,446
04-09-2010, 09:09 AM
2. ### probability space

hi, I need some help with this one.... Let \Omega be a finite set. Show that the set of all subsets of \Omega (2^omega), is also finite and...

• Replies: 1
• Views: 2,552
04-08-2010, 12:41 PM
3. ### Please help. This is impossible. Please!

Please help me answer these. They are due by midnight and I am totally lost. Please. I need to pass this class. Thanks in advance. You can see...

• Replies: 3
• Views: 3,387
04-07-2010, 01:02 AM
4. ### disctrete or cumulative ??

0 if x <2 0.7 if 2 <= x < 2.5 F(x) = 0.8 if 2.5 <= x < 3 1 if x => 3 from first sight i think that this is a...

• Replies: 2
• Views: 2,252
04-07-2010, 12:50 AM
5. ### help with 2 r.v. normal distribution problem

Hi all, so my question has to do with 2 r.v. and normal distribution. X: mean = 5000, standard deviation = 100 Y: mean = 5200, standard...

• Replies: 8
• Views: 5,548
04-06-2010, 08:54 PM
6. ### what is a log normal?

Hi there, I have a question regarding the log normal and normal distribution. What I think is that if Y has a normal distribution then X=log(Y)...

• Replies: 2
• Views: 4,610
04-06-2010, 09:11 AM
7. ### Calculatng an event

Find the probability that contains the event A but not event B. P(A) = 0.15, P(B) = 0.05, P(A or B) = 0.17 I thought I could use P(A or B) - P(B)...

• Replies: 1
• Views: 2,322
BGM
04-05-2010, 03:40 AM
8. ### How to show that this is chi-square distribution?

I have something like 2 Sum from i=1 to n {X^2 / Theta^2} where X is Wei(Theta,2) it is distributed chi-square 2n but I do not know where to start....

• Replies: 1
• Views: 4,862
BGM
04-05-2010, 03:21 AM
9. ### Finding the Probability

Hi I just have a quick question, and just want to know if I did the question right :) A organization contains 2 events, E and T. The organization...

• Replies: 1
• Views: 4,132
04-02-2010, 02:09 PM
10. ### short question measurable function?

Hi there, All numbers, "N", "n" and "t-1" are subscripts: Let the data Z0, Z1, ..., ZN be the data we have. Let Fn=σ(Ζ0, Ζ1, ... Ζn). θ is...

• Replies: 0
• Views: 2,243
04-02-2010, 05:08 AM
11. ### Probability

An object has probability 0.10 of being defective. i) If a sample of 100 objects is drawn, exactly 10 will be defective. True, because its 100 X...

• Replies: 1
• Views: 2,848
04-01-2010, 10:44 AM
12. ### Direction please

What statisics to I need to use work out the probability of seeing a dolphin given that it has been seen before? i.e. If it was seen once, will it...

• Replies: 1
• Views: 2,472
03-28-2010, 06:25 PM
13. ### HELP PLEASE! Normal Probability Question.

So I have a quick question. I was able to figure part A out (i think) but I don't think my answer for part B is correct... The daily dinner bills...

• Replies: 2
• Views: 7,603
03-27-2010, 05:13 PM
14. ### Question about 68-95-99.7 rule

Suppose that 60% of all students at a large University access course information using the internet. There is a 68% chance that the sample...

• Replies: 1
• Views: 5,352
BGM
03-25-2010, 09:18 AM
15. ### Probability problem

An airline has 500 places for a flight. However, due to only 95% of reservations being taken the airline usually overbooks by 20 places. When the...

• Replies: 4
• Views: 3,104
BGM
03-23-2010, 01:25 PM
16. ### Please recommend a book that blends research methodology and statistics

Hi, Over the past few months, I've went over an introductory statistics text along with some multivariate stuff. I'd like to now design...

• Replies: 3
• Views: 3,950
03-22-2010, 10:56 AM
17. ### product of sequences converging in probability

Hi, I'm stuck on the following problem: Show that if X_n -> X in probability and Y_n -> Y in probability then (X_n)(Y_n) -> XY in probability. ...

• Replies: 1
• Views: 4,284
mnt
03-22-2010, 10:40 AM
18. ### Terribly confused-binomial distribution & profit

Would someone kindly take a look at this problem? The link is to the book page in google books. (it is a long problem). I seem to have parts 1 and 2...

• Replies: 0
• Views: 2,180
03-22-2010, 08:19 AM
19. ### 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: 5,620
03-20-2010, 12:48 PM
20. ### Gaming Problem

This is probably a trivial problem -- but it has me stumped. I'm doing a simulation of a roulette game and trying to calculate probability (no...

• Replies: 0
• Views: 2,494
03-20-2010, 12:45 PM
21. ### Expected value of ratio: please help!

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: 5,799
03-19-2010, 04:38 PM
22. ### conditional probability

hi, well i've just started to mess around the probabilities and the problem i don't understand is : if a probability for a person to finish his...

• Replies: 2
• Views: 2,242
03-19-2010, 02:40 AM
23. ### Probability density function

I'm having trouble with the continuous distribution. I can verify that f(x) satisfies the requirements for the uniform random variable X and find...

• Replies: 2
• Views: 3,583
03-17-2010, 04:11 PM
24. ### Need some guidance!!!

I just need my work verified for the problem below. Any help/guidance is much appreciated. A faculty member can be either an assistant professor,...

• Replies: 0
• Views: 3,611
03-16-2010, 12:08 PM
25. ### zero inflated poisson distribution

I am new and I hope I'm abiding to the rules. I just wanted to know what exactly a zero inflated Poisson distribution is? How is it related to the...

• Replies: 2
• Views: 6,382
03-16-2010, 09:21 AM
26. ### Do you recognize this distribution?

I'm pondering the probabilities involved in playing a certain fantasy wargame. For the most part, this game works on a dice pool mechanic can be...

• Replies: 0
• Views: 2,038
03-15-2010, 11:17 PM
27. ### stage 1 probability question

hey i know that this might seem like a really easy question for you guys :( but here goes: well there are 10 six sided dice, all independent. what...

• Replies: 3
• Views: 3,394
03-15-2010, 07:44 PM
28. ### Machines fail randomly once a month on average.

With one machine how long do I have to wait, on average, for a failure? I don't know when the last failure was. How long for the first failure...

• Replies: 4
• Views: 2,437
03-15-2010, 09:55 AM
29. ### correlated binary variables

I have the following problem: let X = {x_i}, and Y = {y_i} be two vectors of binary variables with n elements (taking the value 0 or 1 with some...

• Replies: 2
• Views: 4,137
03-12-2010, 03:56 AM
30. ### weighted averages and binomials(i think)

consider a multiple choice exam with 50 questions. a student who has gone to class and done homework has a 75% probability of answering any...

• Replies: 0
• Views: 1,882
03-11-2010, 06:30 PM
31. ### Combining random variables, squared

Been sitting with this for a while, and hoping wome of you can assist me. I'm given a pdf f(y) = 6y(1-y) for 0<y<1, and I want to calculate the pdf...

• Replies: 2
• Views: 6,225
03-11-2010, 12:45 PM
32. ### How to calculate the number of samples?

Our company receives wires which are manufactured to our spec in lot sizes that range between 2000 to 20000 wires at a time. These wires should be...

• Replies: 4
• Views: 9,564
03-09-2010, 05:11 AM
33. ### exact probability, two random variables, normal distribution

Hi, I've been stuck on this problem for awhile: The problem asks to find the exact probability that X will last longer than Y. It says that on...

• Replies: 3
• Views: 6,489
03-08-2010, 10:30 PM
34. ### About the definition of random correspondence

I have a question:"Is there a concepte and a definition on random correspondence in the current Probability Theory?" If there is, how is it...

• Replies: 0
• Views: 2,583
03-08-2010, 11:17 AM
35. ### Numerical frequency analysis query

Hi, I heard about this on radio 4 (UK) back in 2007. A statistical method whereby the frequency of integers in a dataset is calculated, then...

• Replies: 0
• Views: 2,420
03-08-2010, 07:52 AM
36. ### 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: 6,481
03-07-2010, 05:53 PM
37. ### Upper bound for the probability one random variable will be greater than another

Hi Everyone! Just came across this forum a few weeks ago and have already gotten some great use out of it. Just want to say thanks to all the really...

• Replies: 2
• Views: 6,726
03-07-2010, 11:33 AM
38. ### Probability Problem Set

1. It takes five people working on different tasks to produce a new product. A small workplace has five different workers and the plant manager...

• Replies: 0
• Views: 2,170
03-07-2010, 09:08 AM
39. ### Need help with probability questions

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

• Replies: 2
• Views: 2,759
03-06-2010, 02:44 PM
40. ### Conditional expectation question

Hey, I would really appreciate your help with the following question: X and Y each has a uniform distribution on and the two are independent....

• Replies: 8
• Views: 5,394
03-06-2010, 02:46 AM
41. ### Power large Sample Standardized?

This is probably staring me in the face, but my face has been staring at it for many hours ... ;) In basic power analysis of a mean, using the...

• Replies: 1
• Views: 2,215
03-03-2010, 10:11 PM
42. ### ball game

sorry I got it now, thanks, can someone delete this for me?

• Replies: 0
• Views: 2,993
03-02-2010, 09:11 PM
43. ### Can't seem to figure this one out...

This question must be trickier than I thought: A statistics professor and his wife are planning to take a 2-week vacation in Hawaii, but they...

• Replies: 1
• Views: 5,114
03-02-2010, 02:35 PM
44. ### is this a truncated normal?

Hi there, After some algebra on a problem I have I derived the following distribution concering let's say the r.v. X. ...

• Replies: 1
• Views: 2,982
BGM
03-02-2010, 07:38 AM
45. ### Urgent help needed :(

Hey guys, its my first time in this forum and I am quite desperate. This task is totally confusing me: It is believed that as many as 25% of...

• Replies: 1
• Views: 4,320
02-28-2010, 06:12 PM
46. ### Probability difficulties and Z scores

I am currently grappling with this question: In a certain study the average age was 34.79 years. The SD of age was 14.78. What probability do...

• Replies: 4
• Views: 3,799
02-28-2010, 04:52 PM
47. ### Convolutions

Can anyone explain convolutions to me? I've been staring at page 302 of this book (sum of 2 uniform random variables):...

• Replies: 1
• Views: 3,136
02-27-2010, 11:14 AM
48. ### Probability Problem related to Actuarial Sceince P1

An insurer o ers a health plan to the employees of a large company. As part of this plan, the individual employees may choose exactly two of the...

• Replies: 0
• Views: 4,736
02-26-2010, 09:18 AM
49. ### count of integers in sliding window

Hi all, I'm looking to generate a series of integers in the range , that start off with a large spacing, like 2 50 101, etc. At a peak of some...

• Replies: 11
• Views: 5,631
02-26-2010, 06:29 AM
50. ### probability question with percentage of sales

(I accidentally posted this in the statistics forum so I am moving it over here.) I have worked on solving the problem below for over an hour and...

• Replies: 3
• Views: 10,141
02-25-2010, 08:50 PM
51. ### Interpretation of ratios Cp

Hi to everyone!! I have solved one exercise in statistics and I have a problem in the interpretation of these ratios: I calculated the following for...

• Replies: 3
• Views: 5,445
02-25-2010, 08:27 PM
52. ### Normal distribution? Probability? What?! Help, please! D:

I'm doing a sample test for a Stats quiz I have on Tuesday and I've run into a question that I just cannot get. :confused: I'm sure the method to use...

• Replies: 2
• Views: 3,769
02-25-2010, 04:36 PM
53. ### Probability Concepts Homework Help!!

Hi, I have been struggling with this question for the past few days now and still can't seem to figure it out. If anyone can help me and show me...

• Replies: 7
• Views: 12,441
02-24-2010, 12:51 PM
54. ### Random Variables and CDF

The problem: A transmission channel is noisy and a binary bit (assume it is a 0 or a 1) has probability of .11 of being incorrectly transmitted. ...

• Replies: 4
• Views: 4,318
02-24-2010, 11:16 AM
55. ### Help!!!!

the demand for a magazine is thought to be modelled by a Gamma distribution with mean 10,000 and variance 1,000,000. A publisher prints and...

• Replies: 2
• Views: 2,410
02-24-2010, 08:03 AM
56. ### stochastic dominance, stochastic monotonicity

Can someone point me out on the right direction? I need some theorems, or references or something... There's a random amount, for example, demand...

• Replies: 0
• Views: 2,953
02-23-2010, 06:56 PM
57. ### Probability question

Hello I am hoping that someone with a good understanding of probability theory could answer a question I have. I am trying to understand how...

• Replies: 0
• Views: 2,237
02-23-2010, 08:43 AM
58. ### finding p-value from chi square freedom

For example, estimated p-value from chi-square table with 1 d.f is 0.1 < p < 0.9. Can anyone tell me how we get this range? aka. can anyone help me...

• Replies: 1
• Views: 9,003
02-23-2010, 02:42 AM
59. ### Cup and ball game: what are the odds of that?

OK we are having an intelectual discussion (no, really) about the change in odds during the classic cup and ball game. To explain: a dealer has...

• Replies: 2
• Views: 12,536
02-22-2010, 08:00 PM

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