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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: 30,353
09-30-2005, 09:44 AM
1. ### Help Whith this problem.. probability

Hey my name is george... im Colombian... anyway if you guys can help me with this one i will try to translate this the better i can A box of 50...

• Replies: 6
• Views: 2,572
03-11-2011, 04:54 PM
2. ### Given Joint Density Function

f(x) { x(1+3y^2)/4 0<x<2, 0<y<1 0 otherwise 1. Find g(x), h(y) 2. Find f(x|y) 3.Evaluate P(1/4<x<1/2 | Y=1/3) in getting g(x) is this...

• Replies: 5
• Views: 4,681
BGM
03-10-2011, 04:10 PM
3. ### Looking for help with a question :)

Hi folks, I'm trying to help a friend with some statistics but since I study engineering it's not something I have covered. If anyone could assist me...

• Replies: 1
• Views: 2,677
03-10-2011, 10:07 AM
4. ### 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
5. ### MLE Question - Bernoulli Distribution

Q. A and B are playing a tennis match. A is serving for the entire game. Let p_A be the probability that A wins when A serves. In this game, A wins...

• Replies: 1
• Views: 3,260
03-10-2011, 06:40 AM
6. ### 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
7. ### Joint density function question

let X and Y be a continuous random variables having joint density function of f(x,y)=c(x^2 + y^2), 0<=x<=1, 0<=y<=1 1) Determine the constant c.

• Replies: 10
• Views: 4,010
03-09-2011, 04:52 PM
8. ### Probability/Stats help

I wasn't sure what forum to post this is in, its for stats class but it ask for probabilities. A survey measured numbers of hours per month spend...

• Replies: 1
• Views: 2,223
03-09-2011, 01:32 AM
9. ### E(X) and variance of i.i.d without integration

How would you calculate the Expected value of a independent identically distributed seq. of continuous RVs without using integration? i don't know...

• Replies: 3
• Views: 4,207
BGM
03-08-2011, 11:50 PM
10. ### What type of sampling is this....`

First of all sorry if this is in the wrong section but i think is the section that applies most! I want to distrubute questionaires to five groups...

• Replies: 5
• Views: 2,946
03-08-2011, 11:23 PM
11. ### Probability of event

Hello Friends I'll try to ask in very simple way I will have multiple choice test next month and i have 240 questions every question has 3...

• Replies: 7
• Views: 3,564
03-08-2011, 02:06 PM
12. ### Joint Probability

X and Y below are independent: How am I going to solve the joint probability? Am I correct if I solve it this way:

• Replies: 1
• Views: 2,973
03-08-2011, 11:10 AM
13. ### Likelihood Ratio Test Statistic

Hi guys, Heres my problem: ********** Data X1,X2,....,Xn, n = 20, are available of numbers of flaws per 10 metres of bales of a manufactured...

• Replies: 5
• Views: 10,581
BGM
03-08-2011, 01:43 AM
14. ### on the probability density function

Good morning to all. I have a question: I have a data set X={x_1, x_2, ... , x_N} with probability density function P(x) (suppose continuous); if I...

• Replies: 5
• Views: 4,039
03-07-2011, 04:35 PM
15. ### looking for some help with my highschool homework

hey everyone, sorry for the english i'm not a native. i'm was hoping to you could help me a little bit with a few homework assignments i have ...

• Replies: 5
• Views: 3,320
03-07-2011, 03:05 PM
16. ### MLE question

Q. The proportion of metal in an ore sample has the pdf: f(u) = c.u^(c-1) 0≤u≤1 (a) The parameter c>0 is a measure of the quality...

• Replies: 6
• Views: 2,381
BGM
03-07-2011, 09:08 AM
17. ### MLE Question using binomial distribution

Q. There are N fish in a lake. Six fishermen fished for 3 hours and caught 8 fish between them. They fished for another 3 hours and caught 3 more...

• Replies: 2
• Views: 3,600
03-07-2011, 07:14 AM
18. ### Binomial/geometric distributions

Which of the following are true statements? I. The histogram of a binomial distribution with p=0.5 is always symmetric II. The histogram of a...

• Replies: 6
• Views: 5,638
BGM
03-07-2011, 03:21 AM
19. ### f-divergences

Hi, Is there a 'natural' way to extend f-divergences to multiple distributions? For instance, JS-Divergence for three distributions? Tx, Omri.

• Replies: 2
• Views: 2,955
03-06-2011, 05:20 PM
20. ### Maximum Likelihood Estimator question with binomial distribution

Q. Lifetimes of components are Gamma distributed. The parameters of the Gamma are shape = a scale = λ The pdf is: f(x) =...

• Replies: 3
• Views: 5,626
BGM
03-06-2011, 01:21 PM
21. ### Maximum likelihood estimator question with discrete uniform distribution

Q. A bag contains sequentially numbered lots (1,2...N). Lots are drawn at random (each lot has the same probability of being drawn). Two lots are...

• Replies: 9
• Views: 12,774
BGM
03-06-2011, 01:15 PM
22. ### cumulative distribution function for error

Hi, I need help regarding the generation of cumulative distribution function (CDF) for distance error. I have a system which calculates...

• Replies: 9
• Views: 6,295
03-04-2011, 12:06 AM
23. ### 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: 5,708
03-03-2011, 04:53 PM
24. ### probability of rocket launch failure

hi everyone. My statistics/probability knowledge is unfortunately striving towards zero, therefore I would greatly appreciate any kind of input on...

• Replies: 4
• Views: 6,917
03-03-2011, 10:24 AM
25. ### calculation of distance using Kullback–Leibler divergence

Hi, Basically I'm from biology back ground. So it may be a basic question for you. I have two plots for example plot1: X - axis values: ...

• Replies: 2
• Views: 121,610
03-03-2011, 09:39 AM
26. ### Binomial, did I solve correctly ?

Hi guys, can you please tell me if I am anyway right with this ? The price of a cake of kind A is 15\$. The price of a cake of kind B is 10\$. The...

• Replies: 3
• Views: 2,384
02-26-2011, 11:18 PM
27. ### Arithmetic proof of predicted values

Maybe the title of this thread should be: Arithmetic proof of predicted values or Why you shouldn't let stats lie dormant in your life for 7...

• Replies: 2
• Views: 2,412
02-25-2011, 01:08 PM
28. ### Help with Binomial & Poisson Distribution!!

Hello forum! I am trying to do complete my homework however I am unsure if I did what was asked correctly for one question and I am having issues...

• Replies: 4
• Views: 5,056
02-25-2011, 12:13 PM
29. ### Probability of an event occuring

Hi there, I was hoping someone could give me some help on the best way to investigate a problem. I really don´t know much about probability but here...

• Replies: 0
• Views: 3,182
02-24-2011, 05:43 PM
30. ### Is this possible?

Hello, I've been pondering this question for a while but I don't think I have what it takes to come up with the answer. I'd really appreciate some...

• Replies: 4
• Views: 2,667
02-24-2011, 05:12 PM
31. ### Poisson Distribution

Here's the question: The number of calls that come into a small mail-order company follows a Poisson distribution. Currently, these calls are...

• Replies: 1
• Views: 5,432
02-24-2011, 04:17 AM
32. ### Discrete Probability

Hello all. I recently became a member on this forum. Hope to learn many new things from here and in my statistics course in college. I am still...

• Replies: 1
• Views: 12,426
BGM
02-24-2011, 12:06 AM
33. ### The Old Coin Toss Question

Helppppp meeee! AH. :wave: John flips a fair, two-sided coin 5 times. a. What is the probability that he flips 4 heads? ...

• Replies: 2
• Views: 3,439
02-23-2011, 06:18 AM
34. ### What is the probablity that a randomly selected customer will purchase the product?

1234 1234 1234 1234

• Replies: 0
• Views: 3,047
02-22-2011, 02:33 PM
35. ### Sample size influence on the mean for non-normal distributions?

Hi, I'm not a statistician so sorry if this is dumb. I am making non-linear (neural networks) models and my errors are not supposed to be normal,...

• Replies: 1
• Views: 4,039
02-22-2011, 03:56 AM
36. ### Sample mean Question

Research indicates that, in general, women in United States earn \$0.77 for each \$1.00 earned by a man in an equivalent job. A sample of 100 women...

• Replies: 0
• Views: 2,340
02-21-2011, 03:00 AM
37. ### Marble Question

Hey guys, This is my first posting on here. I am a beginner in Prob/Stat and will be starting a class this summer. I want to learn as much as I...

• Replies: 1
• Views: 3,124
02-21-2011, 12:20 AM
38. ### How would I calculate triple coin flipping in sets?

Say you have three pennies. You throw them all in the air and record the way they land. Then you do this five more times for a total of six throws: ...

• Replies: 4
• Views: 4,846
02-19-2011, 08:33 PM
39. ### The Generator and Compensator of Stochastic Processes

What is, intuitively, the difference between the generator and compensator of a stochastic process? tks

• Replies: 0
• Views: 3,210
02-19-2011, 11:20 AM
40. ### Many urns, two color marbles = distribution?

Not homework here, actually trying to estimate the success rate of an algorithm against a random strategy... 25 white marbles 25 red marbles...

• Replies: 0
• Views: 2,039
02-18-2011, 12:42 PM
41. ### Poisson RV

Hi Guys, I just need you to check if I solved correctly... The number of power problems a day in some city, is a poisson random variable. it is...

• Replies: 0
• Views: 2,003
02-18-2011, 07:58 AM
42. ### Conditional multivariate

Strangely, I am not sure about something very simple... I know that by definition, P(X1 | X2,X3) = P(X1,X2,X3) / P(X2,X3) But is this also...

• Replies: 1
• Views: 3,234
BGM
02-15-2011, 10:18 AM
43. ### Probability Theory

An automobile insurance company classifies drivers into 3 classes: class A, class B, and class C. The percentage of drivers in each class is: class...

• Replies: 2
• Views: 2,922
02-14-2011, 07:43 PM
44. ### Hidden State Modeling

The disease state is continuously changing in patients and I want to be able to predict this change (slope) ahead of time using 3 variables measured...

• Replies: 1
• Views: 2,723
02-14-2011, 01:02 PM
45. ### Joint Density f(X,Y) integration when there is no Y in the eqn

Hi I'm having difficulties with integration by parts when the main function of a joint distribution doesn't contain the Y. Here it is: Let X and Y...

• Replies: 24
• Views: 8,664
BGM
02-14-2011, 04:09 AM
46. ### Probability of complements.. is it that simple?

P(A) = 1/4 P(B) = 2/3 P(A|B) = 1/4 Question: What is P(A^c|B^c) ? I don't think it's just 1 - 1/4 = 3/4 ... Would it be P(A^c) * P(B^c) =...

• Replies: 2
• Views: 4,081
02-14-2011, 01:19 AM
47. ### Weighted Die

Hello I have a question about weighted die and binomal distribution the question goes like this Someone rolls one die 5 times. The die is...

• Replies: 3
• Views: 5,678
BGM
02-13-2011, 03:25 PM
48. ### Sampling Distribution Question

I have a couple questions here that I think I am doing correctly, just want some confirmation? Thanks! 1. Suppose that the final exam scores of a...

• Replies: 4
• Views: 5,387
02-12-2011, 12:22 AM
49. ### Very very low arrival rate and fitted distribution

I am attempting to fit a distribution to a process with a low arrival rate. The unit measurement is 1 day and I have an average arrival rate of 0.02...

• Replies: 2
• Views: 3,225
02-11-2011, 09:50 AM
50. ### Unit Root

What's this about? I'm new to econometrics and i'm trying to understand this conceptually. I know it has to do with nonstationarity (mean, variance...

• Replies: 0
• Views: 3,526
02-09-2011, 06:14 PM
51. ### Review this Probability math

Hi, I'm a new user looking for assistance in a single probability equation: So to try to help convey my problem as clear as possible I'll list my...

• Replies: 1
• Views: 4,939
02-09-2011, 05:21 AM
52. ### Roulette & interesting binomial question

Hi everyone, Since I have some mathematical knowledge my friend asked me to help him out with a question with which I'm struggling: "On a...

• Replies: 5
• Views: 5,387
02-08-2011, 06:07 AM
53. ### probability channels

We have a weather station somewhere in the country, with the aid of satelitte information and it gives us the probability of rain every day. Suppose...

• Replies: 3
• Views: 2,719
02-07-2011, 10:00 PM

Hi everyone, I m new to stats and I m stuck with this two question for 2 hours now...I ll be really appreciate if someone here could show me how to...

• Replies: 2
• Views: 6,947
02-06-2011, 02:17 PM
55. ### Trinomial Joint Density

The Question: An unbiased six-sided die is cast 30 independent times. Let X be the number of 1's and Y be the number of 2's. a) What is the...

• Replies: 1
• Views: 3,715
02-05-2011, 10:28 PM

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