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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: 30,180
09-30-2005, 09:44 AM
1. ### Deciding how many averages are sufficient

Hi, I am performing the following operations: All vectors have the same length. Step 1. Define a vector of constants X Step 2. Create a...

• Replies: 3
• Views: 1,776
10-13-2012, 10:13 AM
2. ### decile

hi experts. I 'd like to ask about cluster analysis. to identify the group of customer that which group will have high potential to cancel the...

• Replies: 0
• Views: 677
05-27-2017, 11:34 PM
3. ### deciles

Women's weights are normally distributed with a mean of 143 lb and a standard deviation of 29lb. Find the third decile, D3, which separates the...

• Replies: 1
• Views: 4,715
10-24-2005, 12:20 PM
4. ### decimal answer need for probability

Happy Meal Problem: McDonalds offers a little toy with its happy meals. They have 5 different toys and each toy has the same probability of appearing...

• Replies: 9
• Views: 3,223
02-28-2012, 08:39 AM
5. ### Decision theory

I came across this question and I could attempt part one , but part two is very confusing though I am not sure if the part 1 that I attempted is even...

• Replies: 1
• Views: 2,664
11-15-2010, 04:02 PM
6. ### Decision Trees

I know how to pull back the tree, but I can't figure out how to draw them from a story! Here's the story, please help the best you can: EnvirNova...

• Replies: 1
• Views: 1,193
02-10-2013, 10:23 PM
7. ### Decisions: probabilities and preferences

Hello everybody. I was wondering if anyone could help me with the following problem. I need to decide between three options: a) spend my holiday...

• Replies: 2
• Views: 1,652
12-24-2012, 06:27 PM
8. ### deck of cards

A person selects a card from an ordinary deck of cards. If it is a black card, she wins \$3. If it is a red card between or including 2 and 8, she...

• Replies: 1
• Views: 3,799
10-06-2006, 11:28 AM
9. ### Decomposition of bivariate normal density

Hello, I have a question regarding the bivariate normal density. I need to evaluate density p(x,y), where x is a n x 1 vector and y is n*3 x 1...

• Replies: 2
• Views: 1,196
08-28-2012, 12:28 PM
10. ### Deconvolution of gamma distribution

Notation: g(x,a,b) is the gamma distribution with shape a and scale b. The distribution g(x,1,1) is the standard exponential distribution. ...

• Replies: 0
• Views: 3,607
11-15-2009, 09:58 AM
11. ### defective parts

The ABC manufacturing company purchases a certain part from two suppliers (A supplier & B supplier). The parts received from the suppliers are used...

• Replies: 0
• Views: 4,373
07-10-2009, 01:29 PM
12. ### Defects

I would like to see how I can solve this problem effectively. Thanks for your help in advance. x= no of defects P(x) = prob of defects x ...

• Replies: 1
• Views: 2,279
06-30-2008, 03:49 PM
13. ### Defining a problem with random variables.

I am studying the following problem. Take n random normal distributions each with a common standard deviation of s. Call these d(1), d(2)...d(n)....

• Replies: 0
• Views: 1,760
11-29-2012, 12:24 PM
14. ### Defining parameter following survival function

I am a newbie, with limited statistical skills, so please excuse/correct basic mistakes. My question is about the characteristics of a...

• Replies: 5
• Views: 1,774
BGM
02-09-2012, 02:10 PM
15. ### Definition of (objective) Probability

There are two definition as far as I know (not including subjective probability), and each one has its problems: 1. If O is the set of all equally...

• Replies: 1
• Views: 2,587
01-21-2012, 09:54 AM
16. ### Definition of random variable with respect to event space

It is given that: We toss two dice with sample space Ω = {(i, j), 1 ≤ i, j ≤ 6} and the σ-algebra is generated by the events Ak = {(i,j) :...

• Replies: 7
• Views: 3,436
10-18-2016, 07:26 AM
17. ### Demography Probability Question

Question: What is the probability of having a livebirth (L) at a second birth given that the outcome of the first pregnancy was a stillbirth (D)?...

• Replies: 3
• Views: 2,626
02-07-2008, 09:58 PM
18. ### 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: 2,053
11-13-2008, 06:31 PM
19. ### Demorgans?

I have to show the following hold. i) (A U B)' = A' & B' ii) (A & B)' = A' U B' Can someone verify if this thinking is correct? i) x is...

• Replies: 2
• Views: 2,392
10-22-2010, 06:31 PM
20. ### Density and Median

Help please :confused: The diameter of a ball is a random variable X with the next density: 2x if 0<x<=0.5 1 if...

• Replies: 2
• Views: 2,079
08-19-2010, 12:12 PM
21. ### density function

I have a problem that says: If U is uniform on , find the density function of U^2. So far I have that F(y)=sqrt(y) Where do I go from there?? I...

• Replies: 2
• Views: 7,169
02-19-2009, 05:18 PM
22. ### density function

hi, i'm working on a problem that goes like: A fire-detection device uses two temperature-sensitive cells (cell A and cell B) acting independent...

• Replies: 3
• Views: 4,058
06-04-2009, 03:25 AM
23. ### density function for X^2Y^2 and max(X,Y)

Hi guys i am struggling in how to find the density function for X^2Y^2 and max(X,Y). Here's the scenario: Suppose a random variable X has the...

• Replies: 3
• Views: 4,796
BGM
06-16-2011, 03:05 AM
24. ### Density function from discrete time values?

Hello, I have a set of times achieved by an agent and want to determine if a probability density function can be derived from that set. Being a...

• Replies: 1
• Views: 1,836
06-29-2012, 08:30 AM
25. ### Density function?

Please can you help me solve this the pdf of continues r.v. X where f(x) {(2x 0≤x≤1 0 elsewhere} 1)...

• Replies: 4
• Views: 3,158
10-05-2009, 04:09 PM
26. ### Density of a random variable

Professor Roberto has to take an oral examination. The grading scale is as follows: 5: = best and 1: = worst. At most he only gives the note 4. Each...

• Replies: 2
• Views: 1,656
04-30-2013, 09:22 AM
27. ### Dependent Event Vs Independent Event Vs Mutually Exclusive Events

While reading probability book I come across with above terms. Following questions raised in my mind. 1)Are Dependent events always Mutually...

• Replies: 3
• Views: 25,506
01-15-2013, 10:04 AM
28. ### Dependent normal distributions

I'm doing some stock market analysis for a personal project. If I have two stocks which generate returns which are normally distributed, what is...

• Replies: 4
• Views: 8,954
10-08-2010, 01:33 PM
29. ### Dependent or Independent

Hello, I am asked the following in an assignment: Let A be the event that a letter picked at random from a piece of English text is T and let B...

• Replies: 11
• Views: 4,646
11-03-2010, 12:57 PM
30. ### dependent probability question?

Hello, I had a question about how to calculate dependent probability. Calculating independent probability is easy, simply multiply the probability...

• Replies: 0
• Views: 1,232
11-30-2013, 10:36 PM
31. ### 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: 2,660
11-02-2008, 03:59 PM
32. ### Derived Random Variable

Can someone please explain the idea behind this to me? My text says "Assume X is a random variable. Then we can define another r.v. Y = g(X). ...

• Replies: 2
• Views: 3,505
03-03-2012, 07:43 PM
33. ### deriving expected value of negative binomial distribution

Hey all, I've derived the expected value of the binomial distribution, but I can't seem to figure it out for the negative binomial distribution....

• Replies: 0
• Views: 11,704
05-13-2007, 07:50 PM
34. ### Deriving posterior probability from frequencies

I'm working through an introductory Bayesian stats text: Doing Bayesian Analysis. Having been away from stats for a while and having never working...

• Replies: 5
• Views: 3,561
11-29-2012, 01:15 PM
35. ### Deriving probability distribution

I've got a dataset of electricity prices for in New York City for the past five years. Surprisingly, prices can be both negative and positive (don't...

• Replies: 1
• Views: 2,643
ssd
12-13-2006, 06:35 AM
36. ### Deriving the sampling (or asymptotic) distribution

Assume we have the following function: f(p) = \frac{1}{(1-p)d}\ln\left(\frac{1}{T}\sum_{t=1}^{T}\left^{1-p} \right) where d is a constant ...

• Replies: 3
• Views: 2,616
03-02-2014, 01:18 AM
37. ### Deriving Var from mu and two Ps

If I know the mean of a normal distribution and two probabilities F1=P(Z>z1) and F2=P(Z>z2), I should be able to derive the Var of the distribution,...

• Replies: 2
• Views: 1,449
BGM
03-13-2013, 02:03 PM
38. ### Describe Sample Space

Suppose you toss a fair coin until you obtain exactly R heads. 1) What is the probability that K tosses are required? 2) Describe your sample space....

• Replies: 2
• Views: 6,828
10-16-2010, 10:27 PM
39. ### Desperate

It would be greatly appreciated if I could get some help with the following question. The probability of incurring an insurance claim loss of...

• Replies: 2
• Views: 3,339
05-20-2007, 08:09 PM
40. ### Desperate to understand....

Desperate to understand how to calculate p value for my research on object line degradation, I have tried SPSS, etc, but am getting more and more...

• Replies: 3
• Views: 1,976
01-16-2013, 01:05 AM
41. ### Desperately needing homework help!

I tried the math lab at the local college and the statistics professor was as stumped as I was! A videotape has an average of one defect every...

• Replies: 4
• Views: 4,775
07-30-2007, 04:02 PM
42. ### Determinant of the variance-covariance matrix

Let ∑ be the variance-covariance matrix of a random vector X. The first component of X is X1, and the second component of X is X2. Then det(∑)=0...

• Replies: 0
• Views: 4,310
10-10-2009, 06:15 PM
43. ### Determine distribution and parameters

I have a question but maybe it's the wrong question so I'll state the task first... I want to make data that looks like the data I'm working with...

• Replies: 5
• Views: 1,577
09-21-2015, 09:13 PM
44. ### Determine distribution given moment generating function

I am given two moment generating functions, and need to calculate some probabilities regarding them. The first is: M(t) = ((2/3)e^t + (1/3))^3 ...

• Replies: 1
• Views: 1,438
03-06-2015, 02:49 AM
45. ### Determine how close a real distribution is to an ideal one.

My apologies if this is an insultingly easy question: I'm trying to determine how close a real distribution is to an ideal one. Example: a...

• Replies: 1
• Views: 1,563
09-28-2011, 11:28 AM
46. ### Determine if a worker differs from typical performance?

I'll start with some details about my specific situation. I've got a database that contains records of jobs, clients, and workers. My goal is to see...

• Replies: 3
• Views: 1,626
08-18-2012, 02:03 PM
47. ### Determine probabilty of a sampled value being <= 40

Hi all! Brand new poster here, trying to think back to those stats classes that I hated at the time, but now seem fascinating. Ahhhh to be 18 again...

• Replies: 2
• Views: 211
09-28-2017, 12:14 PM
48. ### Determine the risk (probability) of meeting forecasted demand

Hi, I'm doing a project for a car company for my final year studying Industrial Engineering. The company forecast demand 4 months ahead but,...

• Replies: 1
• Views: 2,416
05-08-2016, 02:03 PM
49. ### determine underlying distribution

Dear all, I am working on this problem and i want to determine what is the underlying distribution in this experiment. I would appreciate if you...

• Replies: 0
• Views: 2,585
09-19-2007, 10:09 PM
50. ### Determing Return Periods

Hello users, I have a cummulative distribution (weibull) for a variable and I want to know how to calculate the return period (5, 10, 15, 20, 50...

• Replies: 0
• Views: 2,123
07-16-2009, 11:51 AM
51. ### Determining a prob mass function? E[X] and Var[X] help please?

There are 10 chips in a bag: 4 have the number 1 written on them, 2 the number 2, and 4 the number 3. Suppose each chip is drawn with the same...

• Replies: 1
• Views: 2,818
09-29-2009, 10:03 PM
52. ### Determining a probability

There are 15 CDs in a box. On 10 of the CDs there are saved data fi les, and the other CDs have no data files saved on them. i) Suppose that 12...

• Replies: 1
• Views: 1,185
10-23-2012, 11:00 PM
53. ### Determining expected ranges, given correlation

Hi, I have a question relating to whether or not (and if so, how) we can infer range of P10/P90 possible outcomes for a variable given a...

• Replies: 0
• Views: 2,667
11-27-2008, 06:13 PM
54. ### Determining if a bag of coins contains fair coins

This is actually a problem from a specific biological dataset, but can be more generally described as follows: I have a bag containing n coins....

• Replies: 1
• Views: 1,126
06-28-2012, 07:06 PM
55. ### Determining Joint PDFs, and Marginal PDFs

Hi All, I'm going through revision questions, and I am stuck on this particular section all with similar questions. If somebody can give me a guide...

• Replies: 13
• Views: 12,852
05-15-2008, 01:04 AM

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