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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: 30,339
09-30-2005, 09:44 AM
1. ### Probability question. Think its Multinomial.

The Question is: Packets of a certain brand of shampoo should contain 1kg of shampoo powder. The filling machine for these packets is known to give...

• Replies: 1
• Views: 1,978
BGM
05-26-2010, 02:09 AM
2. ### Gamma/poisson distribution

Suppose that ‘serious’ road accidents happen on a regional road in accordance with a Poisson process with a rate of 2.3 per week. Let T1 be the...

• Replies: 1
• Views: 6,272
BGM
05-25-2010, 08:36 AM
3. ### Probability Density Function needed

I am looking for a continuous probability density function defined in the interval with the following properties: 1. If the mode is 0.5 then...

• Replies: 3
• Views: 2,910
05-23-2010, 02:17 AM
4. ### Is this a standard distribution?

Hello, Please pardon my LaTeX, but does anyone recognize this probability distribution? \frac{ (1-w)^{n_1} w^{n_2} }{ ...

• Replies: 6
• Views: 2,549
BGM
05-22-2010, 04:26 AM
5. ### why should the I use a t distribution? (theory question)

Hello I would like some help with the theory behind the t-test. I know how to technically perform a t-test but something in the logic doesn't add...

• Replies: 5
• Views: 7,346
BGM
05-19-2010, 01:15 PM
6. ### Convergence problem in probability

Hi, the following question keeps coming up in recent year's exam and i'm unsure how to do it fully: Q. If the sequence of random variables...

• Replies: 1
• Views: 4,261
BGM
05-19-2010, 10:18 AM
7. ### How can I determine the accuracy of some predictions?

How can I determine the accuracy of some predictions? Take the example of weather forecasts. Each day weather.com has a predicted probability it will...

• Replies: 2
• Views: 4,160
05-18-2010, 11:47 AM
8. ### Good Probability Theory Text Book

Hello, I am wondering if someone, preferably a graduate student, instructor, or professor, could recommend a good textbook about probability. ...

• Replies: 3
• Views: 4,337
05-17-2010, 06:43 PM

A box contains six balls, labeled 1 through 6. What is the probability that if you draw out two of the balls, the sum of the numbers on the two is...

• Replies: 1
• Views: 2,236
05-14-2010, 09:21 PM
10. ### Sum of Weighted Probability Distributions

If I sum independent random variables X + Y = Z, then the distribution f(z) will be given by the convolution of the probability distributions f(x)...

• Replies: 2
• Views: 9,726
05-14-2010, 10:38 AM
11. ### What data transformation should I apply to count data, which includes zero values?

What data transformation should I apply to count data, which includes zero values and follows the negative binomial distribution, prior to the...

• Replies: 1
• Views: 5,155
05-13-2010, 10:27 AM

hey could you guys tell me if i got these correct because there are some I'm unsure on the method thanks :wave: X-Exp(0.3) then find P(X>15|X>10)...

• Replies: 6
• Views: 3,602
05-13-2010, 04:15 AM
13. ### How to calculate the expected overlab between sets

Hi! I wish to do the following: I have two vectors with N elements in each. All elements are set to zero. Now, in each vector I select n...

• Replies: 1
• Views: 3,199
BGM
05-11-2010, 02:45 PM
14. ### mann whitney test or Kolmogorov smirnov test?

I'm working with non parametric methods to compare two samples and detect diferences between them. I used the mann-whitney test and obtained, for all...

• Replies: 23
• Views: 27,112
05-09-2010, 02:28 PM
15. ### help needed

Hello, I have two questions. 1)Each year in my company employees (about 100 people) are evaluated. Scores are: 0.7, 1.0, 1.2 and 1.3....

• Replies: 2
• Views: 2,793
05-09-2010, 01:19 AM
16. ### Industry-Wide safety factor of 4

I want to hang a 10# picture on the wall so I carefully and slowly load the hanger with 40#. It doesn't fall. What can I say at this point about...

• Replies: 6
• Views: 5,266
05-08-2010, 10:20 AM

Three iid random variables, X, Y and Z with normally distribution with known mean and variances. If two pairs are made, X+Y and Y+Z then are they...

• Replies: 4
• Views: 3,695
BGM
05-08-2010, 03:41 AM
18. ### Help with Binomial Proportion Estimate

Hello All, This problem has been giving me headaches! When a person walks into a supermarket they either use a cart (success) or don't use a...

• Replies: 2
• Views: 2,885
05-06-2010, 05:22 PM
19. ### Simple probability question

Test question: Assume that it is equally likely for a pregnancy to deliver a baby boy or a baby girl. Suppose that for a particular large...

• Replies: 4
• Views: 4,815
05-06-2010, 12:25 PM
20. ### 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: 5,730
05-06-2010, 06:14 AM
21. ### very short question bounded in prob

Hi there, If X is a r.v. and E(X^2)<infinity , can I say that the r.v. X is bounded in probability? If yes why? Is there a theorem or...

• Replies: 3
• Views: 2,755
BGM
05-06-2010, 05:41 AM
22. ### Need help for Selecting Model

Hi, I'am working in a project of a service company.Say they are providing 4 different service to customer.Now my task is to find the transition...

• Replies: 1
• Views: 2,061
05-05-2010, 11:13 AM
23. ### Sojourn time of birth and death process

Hello, I'm having trouble working out the sojourn times and the lecture notes are no help. So far all I know is that they are independently and...

• Replies: 2
• Views: 4,886
05-04-2010, 01:40 AM
24. ### Probability that a hypothesis is correct

I posted this question on Y! Answers a while ago and no one answered it :) I thought I'd try my luck here instead. A scientist performs an...

• Replies: 1
• Views: 2,574
05-03-2010, 03:15 PM
25. ### How do I add percentages?

For instance, let's say a person is a truck driver and there's an: 80% chance of they smoke 40% chance of they are overweight 60% chance of they...

• Replies: 4
• Views: 8,000
05-03-2010, 11:15 AM
26. ### Probability of leading at quarter time

Hi all, I'm interested in calculating the probability that a sporting team will be leading at quarter time if the probability of the team winning...

• Replies: 0
• Views: 2,784
05-03-2010, 07:23 AM
27. ### Examples of strictly stationary sequence?

Hi. I come across this 'stationary' term quite frequent. I find 'stationary increment' in Poisson process. But, now, in extreme value theory, i find...

• Replies: 0
• Views: 5,161
05-03-2010, 05:25 AM

Hi people, Stasticians :) I'm new and a mom. I have been asked to help out with an assignment due tomorrow :O - she has been away overseas for...

• Replies: 1
• Views: 3,978
05-02-2010, 11:14 PM
29. ### Probability that W(t) = 0 (Calculating inverse Gaussian double integral)

I'm working on a problem that asks for the probability that a standard Brownian motion = 0 for some time t between t0 and t1, and I'm stuck on...

• Replies: 1
• Views: 2,916
05-01-2010, 06:51 PM
30. ### Sum of Series?

Hi, I was wondering how to prove Summation from k=0 to d of (d choose k) * (a/d)^k * (1 - a/d)^(d-k) * k = a To put this in context, it's...

• Replies: 2
• Views: 2,510
05-01-2010, 01:22 PM
31. ### Poisson Process

Hello I really need help with this problem and I have to show my work. We went over the Poisson equation but I can't figure out how to plug...

• Replies: 1
• Views: 6,037
BGM
04-28-2010, 12:49 AM
32. ### randomization for design of experiments help

Hi! New here. Looks like a pretty awesome place! I have a question regarding the differences in randomization processes. I'm working on a small...

• Replies: 2
• Views: 3,028
04-27-2010, 06:23 PM
33. ### Help!!!

Hello, I am taking a statistics class and have been able to do well up until now however I have reached a problem and the instructor is not...

• Replies: 1
• Views: 1,932
04-27-2010, 01:35 PM
34. ### Hypergeometric dist

Hi, got a little question regarding Hypergeometric distribution. We mix in an urn 15 coins. 5 coins of 1 pound, 5 coins of 50 pens and 5 coins...

• Replies: 2
• Views: 3,390
04-27-2010, 01:03 PM
35. ### please verify that this is correct

David goes to a drive test until he passes it. the chance of passing the test is 0.6. assume that the tests are independent. if we know that David...

• Replies: 1
• Views: 3,109
BGM
04-27-2010, 11:07 AM
36. ### Logistic Distribution Question

I have two independent random variables each with a logistic distribution (not necessarily same mean and variance). How is the difference (or sum)...

• Replies: 6
• Views: 8,226
04-27-2010, 07:22 AM
37. ### Shared risk / reward

Ok. I'm not a math wiz, but a buddy and I had a debate regarding probability. Here's the scenario, let's say the probability of getting hit by a...

• Replies: 1
• Views: 3,976
04-25-2010, 05:55 PM
38. ### A Darts Problem

In a game of darts the person that throws first in a leg has an advantage. The players take it in turns to go first. So if we assume Player A has a...

• Replies: 3
• Views: 3,126
BGM
04-25-2010, 02:23 PM
39. ### Help Needed

Textbook publishers must estimate the sales of new (first-edition) books. The records of one major publishing company indicate that 10% of all new...

• Replies: 1
• Views: 4,845
04-25-2010, 12:42 AM
40. ### 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: 5,827
04-25-2010, 12:36 AM
41. ### Normal Distribution

An individuals’ heights are normally distributed with mean 70 and standard deviation 3 (inches). a) What proportion of the population is...

• Replies: 4
• Views: 10,988
04-24-2010, 01:34 AM
42. ### True / False ?

P(A/B)=P(B)-P(Ac/B) where Ac is the complement of A Is it true or false ? cheers !

• Replies: 1
• Views: 4,007
04-21-2010, 04:43 AM
43. ### least squares

Hi there, The least squares equations are g1=Σ(y-μ)=0 g2=Σx(y-μ)=0 where μ is b0+b1*x. g1 and g2 take a specific value for each pair of...

• Replies: 5
• Views: 3,553
04-20-2010, 09:34 AM
44. ### Expected value and variance of bootstrap estimate

Hi all! I have a question about bootstrapping. Let the variance estimate based on B bootstrap samples be \widehat{SE}^2_B =...

• Replies: 2
• Views: 8,154
04-19-2010, 06:59 AM
45. ### Bayes' Theory

Hi i'm currently working on a horse race prediction project and trying to include bayes' theory in my project. The thoery is new to me I am trying to...

• Replies: 2
• Views: 4,634
04-19-2010, 03:21 AM
46. ### p-value of empirical distribution

I obtained an empirical distribution (with simulation) of a specific measure - I have 1000 values. Now I want to do right tail test. How do I get...

• Replies: 0
• Views: 5,469
04-17-2010, 03:31 PM
47. ### Equation for the Standard Normal Curve

Does anybody know what the equation is for the standard normal curve? In my statistics class, we use a chart to find areas under the curve given...

• Replies: 6
• Views: 17,487
04-16-2010, 04:52 PM
48. ### Expected Maximum for series of Poisson Distributions

The problem I am working on is this: I have a detector which is an array of 4096 pixels. Each pixel receives an average of N counts. Since this is...

• Replies: 3
• Views: 5,221
04-16-2010, 07:23 AM
49. ### convergence short question

Hi there, The "n" below is a subscript If Xn is a sequence of random variables and Xn converges to zero almost surely. Can we say something...

• Replies: 6
• Views: 3,719
04-15-2010, 08:19 AM
50. ### Assesin expected value of X1>X2 after many permutations of not unique values

Hi all! I have following problem: I have n observed values (some of them are not unique). I permute them many times. Each time I only look at the...

• Replies: 3
• Views: 4,041
BGM
04-15-2010, 06:54 AM
51. ### Expected mean question

Suppose that a random variable X has distribution given by P(X = x1) = a = 1 - P(X = x2), where a 2 and x1 != 0 and x2 != 0. (a) Find E i do...

• Replies: 4
• Views: 3,553
BGM
04-15-2010, 06:49 AM
52. ### Probaility of one random value being bigger than the other?

Hi all! Intuition was telling me that probability of one random value being bigger than the other (both values are sampled from same distribution...

• Replies: 5
• Views: 3,388
BGM
04-14-2010, 11:01 PM
53. ### Uniform Probability

I'm having trouble with this problem, and help would be really appreciated! Suppose a random variable x is best described by a uniform probability...

• Replies: 2
• Views: 9,322
04-14-2010, 08:56 PM
54. ### Probability ?

A machining operation at Cleveland Tool Works (Process A) produces small parts, 10% of which are defective. A similar operation (Process B) produces...

• Replies: 1
• Views: 2,883
04-14-2010, 07:00 PM
55. ### Urgent help needed please !!

In a given sample student size of 90, 2 persons are underweight, 61 healthy weight, 25 overweight and 2 obese. If we select a randomly a student from...

• Replies: 1
• Views: 2,390
04-14-2010, 11:40 AM
56. ### Probability confusion

Hi guys, I have a question here. I understand the reasoning behind the solution, but I am also wondering about why an alternative solution is not...

• Replies: 3
• Views: 3,451
BGM
04-13-2010, 09:14 PM
57. ### overlap integrals for empirical data

Hi, I have two sets of data each originating from a different probability density function for a continuous stochastic variable (I do not know how...

• Replies: 2
• Views: 4,147
04-13-2010, 08:13 PM

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