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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: 30,224
09-30-2005, 09:44 AM
1. ### standard deviation of a ratio of dependent variables

Hi- I have a function (ratio essentially) r= x / (1-x) I need some way of expressing the error of r ... I've experimentally measured x and...

• Replies: 2
• Views: 11,877
11-27-2008, 04:54 AM
2. ### MLE of a Gamma Distribution

Hello everyone, I'm having quite some trouble with a question about the maximum likelihood estimator of a gamma distribution. The question is as...

• Replies: 2
• Views: 28,466
11-26-2008, 01:24 PM
3. ### uniform distribution

A bus travels between Glasgow and Edinburgh, which we suppose are 78km apart. If the bus has a breakdown, the distance from breakdown to Glasgow has...

• Replies: 5
• Views: 4,891
11-26-2008, 09:27 AM
4. ### Probability Question

I was given 10 problems is my stats class and is having an issue with one. Can someone help me? Suppose n men throw their hats into a pile and...

• Replies: 4
• Views: 2,584
11-26-2008, 09:02 AM
5. ### random variables and variance

if we let X be a (continous or discrete) random variable with range Rx how can we find Var(X)?? i dont have any clue plz help me. thx

• Replies: 4
• Views: 3,600
11-26-2008, 07:00 AM
6. ### Calculating probability of multiple events

This is my first post so I hope I can get my question across reasonably intelligently. I have calculated the probability of an event occurring for...

• Replies: 3
• Views: 13,414
11-26-2008, 05:24 AM
7. ### Random Variables

Haven't a clue where to start with this problem: Leona and Fed are friendly competitors in high school. Both are about to take the ACT college...

• Replies: 1
• Views: 6,275
11-26-2008, 12:49 AM
8. ### test of significance with Poisson Distribution...

Hello guys, well my problem is the following: I have some data that I have proved that follow the Poisson distribution using chi-squared test. Then...

• Replies: 2
• Views: 6,104
nwg
11-25-2008, 03:46 PM
9. ### Distribution Probabilities

Here's my question with what I have done so far.. Guess I'm looking to know if I am on the right track - thanks in advance A completely confuses...

• Replies: 2
• Views: 2,567
11-24-2008, 10:18 PM
10. ### Normal distribution

Hey guys, was wondering if you guys could help me out with this, been ok so far with my Stats at Uni but not sure what to do with these examples, can...

• Replies: 2
• Views: 2,242
11-23-2008, 10:01 PM
11. ### looking for algorithm for weighted random choice

The subject line probably doesn't quite call it what it's supposed to be called but, anyway, here's the problem: Just for the sake of argument,...

• Replies: 1
• Views: 4,801
m3p
11-23-2008, 01:02 PM
12. ### k-sided dice

Hi everyone, Looking for a bit of help. If i throw a k-sided dice twice, what is the expected value of their sums. I'm looking for a formula for...

• Replies: 2
• Views: 2,713
11-22-2008, 08:40 PM
13. ### Probability of exactly one?

Hello, I have a question that I am stuck on. Given: the probability of passing a Photography class is 75% and the probability of passing a...

• Replies: 9
• Views: 8,083
11-21-2008, 07:29 AM

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: 5,665
11-20-2008, 03:37 PM
15. ### Statistic & Probability

I am having problems completing assignment of 8 problems. I do not know what I am doing and I need this course to graduate in the spring. I would be...

• Replies: 1
• Views: 2,946
11-20-2008, 03:00 PM
16. ### Probability question- Are my answers correct

Question: You are given the probabilities given below: P(A)=0.30 P(B)=0.40 P(C)=0.10 P(A or D)=0.50 P(A and D)=0.04 P(A and C)=0.03...

• Replies: 0
• Views: 2,555
11-19-2008, 11:32 PM
17. ### I really need some small help here please.

Hey everybody I am new here one of my friends refered me to these forums as help. SO i have 2 small problems that i will write down right now. I...

• Replies: 1
• Views: 2,894
11-19-2008, 09:28 AM
18. ### Question: generalization for negative binomial random variable

Hello, I wonder if there is a know random variable which is a generalization of the negative binomial random variable. The generalization I search...

• Replies: 0
• Views: 2,353
twy
11-16-2008, 05:48 PM
19. ### Probability model on common cold

Here is a probabilistic model for the spread of the common cold. We have two people in a room, one of them healthy, and immune, the other sick....

• Replies: 0
• Views: 2,322
11-13-2008, 10:33 PM
20. ### Squared Normal Dist

Hello All- My problem is: Find the distribution of W=X^2 when X is N(0,4) I know that this problem is related to the fact that Z^2 =...

• Replies: 2
• Views: 3,234
11-13-2008, 07:40 PM
21. ### DeMorgans Law

I NEED DESPRETE HELP! I'M GONNA FAIL MY CLASS IF I DON'T GET THE ANSWERS RIGHT! PLEASEEE! Heres the problem: A local TV station predicts a 80&#37;...

• Replies: 0
• Views: 2,063
11-13-2008, 06:31 PM
22. ### Somebody please verify the solution i have posted, am not 100% sure

A telecom produces telephone sets in two plants: New York, and Buffalo. Daily production volumes of a certain model are : 500 and 2000 units...

• Replies: 1
• Views: 2,079
11-13-2008, 04:39 PM

I have trouble with the following two questions concerning expectations, can anyone give me a hint? Question 1) Suppose there are k=10 types of...

• Replies: 5
• Views: 3,898
11-13-2008, 03:15 PM

Here is my problem. I need to estimate a ramdom variable h with a chi-square distribution, that is, h= x^2+y^2 with x and y gaussian. The observed...

• Replies: 0
• Views: 2,336
11-13-2008, 01:25 PM
25. ### Complicated STATs problem

Say I have five variables A, B, C, D and E that range anywhere from -11 to 11. Given that A,B,C and D occur before E and there is correlation,...

• Replies: 0
• Views: 2,681
11-13-2008, 12:58 PM
26. ### Parametric Test on Ordinal Data

Hi to everybody, can I used a parametric test to compare, for example, two independent samples when these samples contain ordinal data and are...

• Replies: 0
• Views: 3,202
11-12-2008, 11:17 AM
27. ### Cereal Prizes

Hi, I'm stumped on a probability question. Here's the situation...a cereal company gives away 3 different prizes in its boxes of cereal, with...

• Replies: 7
• Views: 3,804
11-11-2008, 07:39 PM

I dont know why I cant get this, i know its not hard. Id really appreciate it if someone could clear this up for me =( If there are 72 multiple...

• Replies: 7
• Views: 2,406
11-11-2008, 12:16 PM
29. ### HElp

3. (15 points / 3 points each) Wait time for a taxi outside Penn Station in New York City is uniformly distributed on the interval (0, 420) where...

• Replies: 1
• Views: 1,623
11-09-2008, 03:31 PM
30. ### Probability question -- T Distribution

You are the head of the Amex card group. Nationally, the credit card default rate is at 12&#37; A random sample of 25 Amex card holders shows a default...

• Replies: 3
• Views: 2,641
11-08-2008, 08:54 AM
31. ### Random Thoughts?

This is a question I am thinking through and just need some input as to whether I am reasoning correctly. I have never thought of the sample mean as...

• Replies: 3
• Views: 1,882
11-08-2008, 12:10 AM
32. ### Questions need help!!

Weekly demand for packs of a certain make of chocolate trifle at a major supermarket store has a Normal distribution with mean of 200 and standard...

• Replies: 0
• Views: 2,249
11-07-2008, 07:03 AM
33. ### Transformation of Y = 1/X

X ~ U(2,4). Find the density of Y = 1/x f(x) = (1/2, 2<x<4) (0,elsewhere) G(Y) = P(Y<y) = P(1/X<y) = P(X>1/Y) = 1 -...

• Replies: 3
• Views: 6,580
11-07-2008, 06:45 AM
34. ### Sampling marbles

I have an urn containing N marbles: M white marbles and N-M black marbles. From this urn, I need to grab a handful of marbles (n) and figure out...

• Replies: 0
• Views: 2,547
11-06-2008, 06:51 PM

Robert is a

• Replies: 23
• Views: 5,487
11-06-2008, 06:03 PM
36. ### uniform dist. parameter est.

Here is the problem: Use MLE to estimate the parameters of the two parameter uniform pdf f_Y_(y;theta1,theta2)=1/(theta2-theta1);...

• Replies: 1
• Views: 2,571
11-06-2008, 02:08 PM
37. ### zmoggggg -- Continuation of Poisson question, please verify and advise

ok so lambada value here =4 (Average of 240 planes in 1 hr) and for the following question a) atleast 1 plane arrives during the 10-minute...

• Replies: 2
• Views: 2,165
11-06-2008, 01:50 PM
38. ### Help please! The sum of two rolling die

hey! Does anyone know how to do this question: "You keep rolling a die until either: 1. The sum of the two die is equal to 7, twice 2. A 6...

• Replies: 3
• Views: 2,993
11-06-2008, 11:24 AM
39. ### Help! First time taking Stats and soooo confused!

I'm taking Statistics online and every week I can barely get through the assigned problems. I'm not sure how to even begin figuring out this...

• Replies: 12
• Views: 5,439
11-06-2008, 09:53 AM

have a couple of questions on my hw that I cannot figure out please help me A) Find P(Z=0) B) Find the z-score that separates the bottom...

• Replies: 2
• Views: 2,688
11-06-2008, 09:23 AM
41. ### Can anybody help me with this probability question?

helpneeeded

• Replies: 4
• Views: 2,290
11-06-2008, 02:24 AM
42. ### Help

I have a couple of questions on my hw that I cannot figure out please help me A) Find P(Z=0) B) Find the z-score that separates the bottom...

• Replies: 0
• Views: 1,781
11-05-2008, 09:09 PM
43. ### Regression Control Chart

I have a project that needs to plot to regression control chart. Can anyone tell me which statistical software I can use for this purpose? Thanks a...

• Replies: 0
• Views: 2,678
11-05-2008, 08:51 PM
44. ### another transformation

Let X be a continuous random variable with p.d.f. f (x) = k(1 − x^2 ), |x| ≤ 1 0,otherwise Show that k = 3/4. I'm not sure...

• Replies: 2
• Views: 2,869
11-05-2008, 04:19 PM

I need help with part of a problem in my Stats book. There are four parts to the problem, and I understand how to do the other three parts, I'm just...

• Replies: 2
• Views: 4,376
11-05-2008, 10:41 AM
46. ### Poisson Process

Hello, Have a task I cant solve; incomming calls to a central follows a poisson process with λ > 0, infinity capasity, and all calls are taken...

• Replies: 3
• Views: 3,952
11-05-2008, 04:45 AM
47. ### random variables

Question: The number of littly, teeny raisins (x) in a box of a popular brand of raisin bran cereal has a distribution with mean 280 and s.d. 25....

• Replies: 3
• Views: 3,808
11-04-2008, 10:41 PM
48. ### Percentile of a Poisson variable

Hi, How can I find the 90th percentile of a Poisson random variable with lamba = 0.4 ? I tried: e-0.4 (0.4^.90) / 0.9! but this gives...

• Replies: 3
• Views: 5,083
11-03-2008, 04:16 PM
49. ### generalized gamma distribution random numbers

Hi there, Does anyone know how to generate random numbers from the generalized gamma distribution?? If you want to check the density take a look...

• Replies: 1
• Views: 4,438
11-03-2008, 07:38 AM
50. ### Reliability of a system with parallel components

Hi, Consider this q.: If all 3 components in a parallel system function independently of one another, and the reliability at time t of the ith...

• Replies: 2
• Views: 6,058
11-03-2008, 03:02 AM
51. ### Derivative help

I am having a problem completing a problem because of derivatives. I complete the work down to the part where I get lnL(theta) =nln(theta)- sum...

• Replies: 7
• Views: 2,683
11-02-2008, 03:59 PM
52. ### The sign of COV( f(x,y) , g(x,y) )

I am a PhD student in Economics, I am reading a paper on statistics, and the author states the following proposition without proof. My question is is...

• Replies: 19
• Views: 9,290
11-02-2008, 03:56 PM
53. ### probability of a machine failure at a certain hour of the day

Hello folks. I look after some servers at work, one of which is intermittently failing. In the 38 days since I set up monitoring, there have been ten...

• Replies: 2
• Views: 4,605
11-02-2008, 12:49 PM
54. ### goodness of fit , 1 sided or 2 sided?

Hello everyone, I am reading about " accuracy " of the Chi squared test. Now we have the following : - P( X=i ) = 1/6 for all i = 1(1)n ...

• Replies: 1
• Views: 3,451
11-02-2008, 11:24 AM
55. ### Is this 2 sided or a 1 sided test

Hello everyone! I am new to Hyposthesis Testing. Suppose my H_0 ( Null Hypothesis ) is : mu =1 I understand that H_1 : mu >1 or H_1 mu<1 are...

• Replies: 2
• Views: 4,019
11-01-2008, 11:44 PM
56. ### Weird Probability Problem

Hi, I'm having trouble with a problem assigned by my teacher that reads: "Assume that you are boarding a flight in which there are five seats and...

• Replies: 5
• Views: 6,408
11-01-2008, 03:49 PM
57. ### Not a problem, but an opinion about a book

I am currently taking a class called Probability/Math Statistics I. We are using a book called Probability and Statistics with Applications. It is...

• Replies: 4
• Views: 2,095
11-01-2008, 10:39 AM
58. ### Selecting K numbers from N=10^L where group of same prefix exists

Hello all, I cannot solve following problem. Lets have a phone numbers of the length L. Number of phone numbers is N=10^L. What is the...

• Replies: 5
• Views: 2,758
10-30-2008, 01:04 PM
59. ### Tough probability question...

We are supposing that the proportion of all adults who think that two children is ideal is p = 0.49. What is the probability that a sample proportion...

• Replies: 2
• Views: 2,512
10-29-2008, 01:14 PM

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