1. Announcement:
05-10-2017
Views:
1,901
Page 2 of 91 First 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 52 ... Last
Threads 61 to 120 of 5451

# 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. ### Solve this??

There are w cakes and n people. The cakes are distributed to people randomly. Find the expected number of cakes a 'i' person can receive. The...

• Replies: 1
• Views: 1,886
09-12-2011, 07:10 AM

First off, let me say I know very little about math and even less about probabilities. I am a father of two teenage boys. One of them gave me a...

• Replies: 11
• Views: 2,179
12-23-2014, 05:42 PM
3. ### Non-linear function of M i.i.d. r.v.

Hi, I have a hard time with the following problem: I consider a population of M r.v. a_i, i.i.d. I need to study the following r.v. eta defined as...

• Replies: 3
• Views: 2,652
04-30-2009, 05:33 AM
4. ### one-sided confidence intervals

1. Let X1,...,Xn be iid with cdf Fθ, where Fθ(x) = (x/θ)^β for x in . Here β>0 is a known constant and θ>0 is an unknown parameter. Let X(n)= max...

• Replies: 0
• Views: 2,546
03-27-2012, 02:51 PM
5. ### Kind of unusual problem...

So this may seem sort of silly but was hoping I could get some help. I am not a very mathematical person but it has interested me a lot recently so...

• Replies: 4
• Views: 1,847
08-08-2011, 05:51 PM
6. ### Help with a probability problem

You have a deck of 60 cards which contains 4 red and 4 blue cards. You draw 7 cards from the deck, what is the probability that you'll have at least...

• Replies: 5
• Views: 2,999
07-02-2010, 12:02 AM
7. ### Joint and Marginal Densities.

I am having some problems grasping the concept of these joint and marginal densities. It would really help if someone could provide me with an answer...

• Replies: 1
• Views: 6,073
BGM
01-30-2011, 02:28 AM
8. ### Discrete Functions and pmf/cdf.

Suppose that X is discrete with pmf p(0)=p(1)=2p(2) (and zero otherwise). Find the pmf and cdf of X. How would you simulate the random variable X...

• Replies: 0
• Views: 3,336
01-30-2011, 02:48 AM
9. ### Joint cdf/pmf- Multinomial Distribution.

I'll really appreciate if somebody could take time to explain the following question's answer. Suppose that (N1, N2) is multinomial with n=2,...

• Replies: 4
• Views: 6,980
BGM
01-30-2011, 11:41 PM
10. ### Joint density. Help!

Let x and y have the joint density: f(x,y) = 6/7(x+y)^2 for 0<=x<=1 and 0<=y<=1 a.Find the marginal densities of X and Y. . b.By integrating...

• Replies: 1
• Views: 6,797
BGM
01-31-2011, 03:01 AM
11. ### Independence of Bivariate Continuos RV's.

By the two definitions of independence for bivariate continuous RVs: (1) F(x,y)=F_X(x)F_Y(y) and (2) f(x,y)=f_X(x)f_Y(y). Prove that these two are...

• Replies: 8
• Views: 3,574
01-30-2011, 11:44 PM
12. ### I've been stuck for a while on this part. Help would be really appreciated!

Let X1, . . . , Xn be IID Exponential(?) random variables. Use mgfs to find the distributionofY =X1 +...Xn.

• Replies: 0
• Views: 1,923
03-30-2012, 12:31 AM
13. ### Prob of happening by chance

Say I have 1000 balls. 50% are blue, 50% are red. Someone trys to convince me they can pick red balls from the bag without looking at the balls. ...

• Replies: 9
• Views: 4,479
04-22-2008, 09:16 PM
14. ### Probability question:??

If I have 2 coins the first coin is a fair coin and sec one is two head. I randomly pick one and toss it twice, the result are both head for two...

• Replies: 8
• Views: 2,384
02-29-2012, 06:09 PM
15. ### Probability a Selection wins the most races

I have 12 races with 6 participants (Sel'n 1 - Sel'n 6) and below is the probablities on how many wins each selection would get... Sel'n 1 Sel'n...

• Replies: 2
• Views: 2,422
08-24-2011, 03:55 PM
16. ### Help summing probabilities

Hi all, I am trying to figure out a way to use probability to estimate the number of customers my business is likely to see again in the future...

• Replies: 0
• Views: 1,299
12-19-2011, 11:59 PM
17. ### Trouble with diagnosis probability

Having an absolute nightmare as part of my Nautical Science Honours course... I'm no statistician! Need to find a solution for this problem, can...

• Replies: 2
• Views: 2,691
01-10-2010, 12:34 PM
18. ### 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: 6,432
11-01-2008, 03:49 PM
19. ### Proof the sum of two CDF's is a CDF.

This is a question my instructor asked in the last midterm exam but nobody was able to solve and he's suggesting it may come out again in the finals:...

• Replies: 4
• Views: 3,131
BGM
10-18-2013, 10:02 PM
20. ### Normal Distribution

Suppose that in an apartment building run by the Probandstat rental company, the inhabitants's weights follow a normal distribution with mean 73.0...

• Replies: 1
• Views: 1,018
12-13-2015, 12:10 PM

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: 3,702
BGM
05-08-2010, 03:41 AM
22. ### Multivariate normal distribution

Hi, I want to calculate expected value of a series. Where X = A + 2B +3C + ..... A = bivariate normal B = trivariate normal C =...

• Replies: 1
• Views: 2,586
10-19-2010, 03:47 PM
23. ### Markov chain

There are two states, A and B; A is initial state from where Markov chain starts. If 5 out of 8 samples have probabilities P1, we move from A to B....

• Replies: 4
• Views: 3,251
11-04-2010, 04:36 PM
24. ### Markov chain hitting time

Hi, I am trying to compute the hitting time of Markov chain. The way I formulated the problem is, what is the time to to hit state j (j in E) for...

• Replies: 2
• Views: 1,563
11-24-2012, 04:14 AM
25. ### Law of Total Expectation

Suppose a box initially contains 1 red marble and 1 black marble and that, at each time n = 1, 2, ..., we randomly select a marble from the box and...

• Replies: 3
• Views: 2,218
02-03-2013, 04:26 PM

Hi. Just trying to figure out something for one of my hobbies... I have a PDF that describes the wait time between event 1 (which happens at...

• Replies: 1
• Views: 2,630
BGM
03-18-2011, 12:05 AM
27. ### Distributions and Percentages

HW problem here. Suppose that when the Slease company overcharges a customer, the distribution of the amount overcharged (expressed as a...

• Replies: 1
• Views: 3,664
10-04-2011, 05:22 PM
28. ### Probability distributions that never have a density (not even a mass)

Hi, the classical example of a distribution that has nowhere a density is Cantor's distribution. Now, I was wondering if we can build other...

• Replies: 0
• Views: 1,707
06-04-2011, 08:33 AM
29. ### characterization of multivariate normal distribution by covariances

Hi, the professor told us that a multivariate normal distribution can be characterized as the only distribution for which zero covariance implies...

• Replies: 3
• Views: 3,619
07-30-2011, 06:50 AM
30. ### Probability Problem

Apologies if my terminology is bad, I haven't done any statistics for years. If this thread is posted in the wrong place, sorry I am new to this...

• Replies: 7
• Views: 2,480
BGM
07-28-2011, 11:46 PM
31. ### Probability for 20 people

Hi, I'm not a stats student, I'm a university student reviewing some literature and I'm interested in some of the statistics related to it and how...

• Replies: 5
• Views: 4,411
12-16-2010, 06:55 PM
32. ### p-value

Can anyone tell me what a p-value of .000 means in layman terms?

• Replies: 1
• Views: 9,823
11-06-2007, 08:25 PM
33. ### Joint probability distribution functions

So a joint pdf is of the form P(X,Y) = SS f(x,y) dx dy, where 'S' is the integral symbol. I've got to cook up the pdf for f(x,y), where X and Y...

• Replies: 3
• Views: 10,413
10-25-2006, 07:34 PM
34. ### Probability that an exponential variable is greater than poisson.

I need help with one problem in my class, the text is taken directly from the book: The life T (hours) of the lightbulb in av overhead projector...

• Replies: 1
• Views: 5,008
01-30-2008, 03:43 PM
35. ### STAT101 Simple-ish Probability

The mean monthly fee for Internet service is \$25, Standard Deviation is \$12. If a sample of 33 households is taken, what is the probability that a...

• Replies: 2
• Views: 2,372
09-09-2009, 05:01 PM
36. ### Probability / Conditional Prob.

Above is the question I'm trying to figure out.... I'm not sure if I'm correct, but attempting the problems results in: a. P<38 = .92 b....

• Replies: 0
• Views: 2,934
12-18-2007, 08:21 PM
37. ### I'm confused about use of a Complement in determining binomial probability

Hi, I'm working on some homework dealing with binomial probability of inequalities. The problem which has caused me some confusion is stated as...

• Replies: 1
• Views: 1,843
BGM
09-29-2012, 04:39 PM

So I missed last weeks lecture in Statistics, but got the homework. I thought I understood what was going on, but maybe not. Here is the problem...

• Replies: 2
• Views: 3,802
11-05-2007, 07:29 AM
39. ### Conditional Probability

Hello!!! Can anyone help me with this problem??...please!!! In relation to Equation P(A│B)=P(AB) / P(B) Show that: P(A│B)P(B)=P(B│A)P(A)

• Replies: 5
• Views: 2,698
03-20-2011, 09:12 PM

Derive the followings equations:

• Replies: 1
• Views: 2,640
BGM
03-16-2011, 12:40 AM
41. ### Probability Problem

Hello everyone!! I need to solve the following problem: Derive the followings equations: - P(AC)=P(AB1C)+...+P(ABNC) -...

• Replies: 0
• Views: 1,958
03-22-2011, 08:21 PM
42. ### Theorem of Total Probabilities

• Replies: 1
• Views: 4,205
BGM
03-28-2011, 10:51 AM
43. ### Occurrence Probability

Hello..... Can anyone help me understand the occurrence probability? I am analyzing wind speed by frequency distribution, to do this I fitted wind...

• Replies: 2
• Views: 2,012
01-11-2012, 10:26 PM
44. ### Performance Function

What is performance function?

• Replies: 0
• Views: 1,076
01-16-2012, 10:24 PM
45. ### probability tree

Suppose 1 in 25 adults is afflicted with a disease for which a new diagnostic test has been developed. Given that an individual actually has the...

• Replies: 0
• Views: 4,490
10-05-2007, 05:51 PM
46. ### probability of liscense plate

What is the probability of getting a license plate that has a repeated letter or digit if you live in a state where the scheme is three letters...

• Replies: 1
• Views: 13,051
10-06-2007, 08:21 AM
47. ### probability and binomial random variable

A state end-of-grade exam in American History is a multiple-choice test that has 50 questions with 4 answer choices for each question. A student must...

• Replies: 0
• Views: 4,037
10-24-2007, 09:44 PM
48. ### Probability, University, Married, Car Insurance, Help!

Haha, I thought I'd be creative with my title.... let's get some facts straight, this has to do with probability and University but I'm not married...

• Replies: 1
• Views: 2,608
10-18-2011, 06:07 AM
49. ### Need help with probability

I have a problem that I DO NOT know what method to use to develop the answer here is my attempted solution, but I want affirmation from a pro. Q:...

• Replies: 1
• Views: 2,836
Rob
11-17-2007, 06:11 AM
50. ### How to calculate a confidence level per unit in production

If a manufacturer produces 100,000 boxes a day that are meant to be packed at 110 units per box, but varies from 105 to 115 units per box, what level...

• Replies: 0
• Views: 2,570
11-02-2012, 06:41 AM
51. ### Probability from Z-score for a given population?

Hi there, Apologies in advance for my lack of stats knowledge. We are using some predictive models that do assume a normal distribution but...

• Replies: 0
• Views: 1,411
06-16-2012, 01:48 AM
52. ### Multiple Criteria, non-binary outcomes

So, I'm trying to predict outcomes using baseball data. What I want to do is predict the outcome of batted balls based on the following criteria: ...

• Replies: 2
• Views: 1,087
02-28-2014, 11:47 AM
53. ### model conversion events

When a web site visitor purchase a product, this event is called a conversion. I would like to know how to model such conversion events. What methods...

• Replies: 1
• Views: 1,262
09-18-2012, 10:23 AM
54. ### The Expectation of a Majority random process

I want to know the answer of the following question, I will be so thankful if somebody gives me some clues: "We start a random process with Nb blue...

• Replies: 1
• Views: 1,342
BGM
03-15-2016, 10:41 PM
55. ### Can some one solve this as soon as possible ?!

• Replies: 1
• Views: 1,602
12-15-2012, 07:41 PM

Page 2 of 91 First 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 52 ... Last

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.