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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: 30,183
09-30-2005, 09:44 AM
1. ### Birthday problem using Bernoulli trails

I came up with this problem: What is the approximate probability that no two people in a group of seven have the same birthday? So, I set up...

• Replies: 5
• Views: 2,867
09-02-2013, 03:36 PM
2. ### Births

Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of an other...

• Replies: 1
• Views: 15,705
10-09-2005, 09:22 PM
3. ### Bivariate normal

Hi, Need some help getting started with an assignment question. We have to independant distributed random variables, X~N(10,3) and Y~N(15,24)....

• Replies: 2
• Views: 2,873
02-14-2009, 12:07 PM
4. ### Bivariate Normal + Max Transformation

Hi guys, This exercise is driving me crazy. That is: (X,Y) follows a normal bivariate distribution E = E = 0 E = E = 1 E = r I have to...

• Replies: 3
• Views: 4,018
02-02-2011, 05:25 PM
5. ### Bivariate Normal distribution

I want to get the characteristic function of the bivariate normal distribution when both means =0 and variances =1 . I can't do the integration. In...

• Replies: 0
• Views: 2,466
Emy
06-26-2010, 04:09 AM
6. ### Bivariate Normal Distribution

I can't figure out this problem. The definition for Bivariate Normal Distribution is too long and complicated to type, but can be easily found if...

• Replies: 1
• Views: 5,063
BGM
05-02-2012, 03:12 AM
7. ### Bivariate Normal problem

PSAT scores: mean = 1200, SD = 100 (Let Random Variable = X) SAT scores: mean = 1300, SD = 90 (Let Random Variable = Y) Correlation p = .6 ...

• Replies: 0
• Views: 2,900
12-06-2010, 10:32 AM
8. ### Bivariate random variable problem

Hello I am trying to solve this problem: A coin is given with probability 1/3 for head (H) and 2/3 for tail (T). The coin is being drawn N...

• Replies: 1
• Views: 2,271
BGM
12-30-2013, 07:16 AM
9. ### Bivariate transformation?

Hello, I'm having problem with a book question from statistical inference, Casella, Berger excercise 4.19 a). X_1 and X_2 are two i.i.d R.V -...

• Replies: 9
• Views: 1,717
01-11-2016, 08:37 PM
10. ### bizarre distributions

Perhaps some expert here can shine some light on the strange results I've been experiencing lately. I wanted to explore the idea of creating a...

• Replies: 0
• Views: 1,255
10-28-2014, 08:59 AM
11. ### Black Jack Anyone?

Using the hypergeometric probability function below: P(x) = (r/x)((N-r)/(n-x))/(N/n) P(x) = probability of x success in n trials n = number of...

• Replies: 3
• Views: 5,870
02-13-2006, 03:02 PM
12. ### Black Swans, non-normal distributions

I am looking for a reference to a popular science magazine article. The point of it was that in the real world we find populations that are...

• Replies: 2
• Views: 1,350
10-22-2014, 08:11 PM
13. ### Blood Groups - I think this is right?

46% of people have blood type O, 42% have type A, 9% have type B and 3% have AB. Among 4 potential donors, what is the probability that: A) all are...

• Replies: 4
• Views: 1,685
01-28-2012, 03:37 AM
14. ### Book for stochastic processes

I need a good reference to learn these topics 1. Markov Chains in discrete time. 1.1. Classification of states, recurrence notions of...

• Replies: 4
• Views: 1,550
07-22-2015, 01:23 PM
15. ### Book recommendations for distributions?

Hi everyone, I'm relatively new to stats (have done two beginner courses on it), and I feel like I learn best when I have an engaging book by my...

• Replies: 2
• Views: 1,316
06-17-2015, 10:15 PM
16. ### bootstrap theory reference?

I am curious about bootstrap methods, and just read the very elementary explanation of them here:...

• Replies: 2
• Views: 1,560
08-23-2012, 08:02 PM
17. ### Bound on the difference of two normal cds

Let Xi be univariate normal variables with means mi and standard deviations di, with i = 1,2. Suppose |m1-m2| < e1 and |d1 - d2| < e2. I need an...

• Replies: 2
• Views: 2,837
08-01-2010, 04:30 PM
18. ### Bounded in Probability proof

Hi all, I could use some help understanding the following proof so please feel free to pitch in! Consider any random variable X with...

• Replies: 5
• Views: 4,615
BGM
10-02-2013, 11:32 AM
19. ### Bowl with marbles

Hi there, I have difficulties in resolving this problem: In a bowl we have 5 white marbles and 15 black marbles. What is the probability of...

• Replies: 4
• Views: 2,366
12-02-2011, 03:46 PM
20. ### Bowling - determining the probability of beating the other guy...

Let's say bowler A and bowler B are going to face off in one match (string) in a single-elimination tournament. The higher score moves on. Over...

• Replies: 2
• Views: 3,573
12-26-2009, 02:34 PM
21. ### Box Plots

I have got some box plots of my data and need to interpret them .I sort of understand what they mean and what it represents but am unsure of how to...

• Replies: 1
• Views: 3,303
06-26-2006, 03:21 PM
22. ### Box with balls that change colors

Hello ! I'm stuck with this problem Suppose that I have a box that contains n balls, where i are white, the others (n-i) are black. if I get a...

• Replies: 1
• Views: 1,874
BGM
07-30-2013, 12:55 AM
23. ### Brain Teaser

It's here:http://www.braingle.com/palm/teaser.php?id=29228&comm=1 I thought that surely the answer must be 0.5 until I considered writing a test...

• Replies: 11
• Views: 3,237
09-08-2014, 11:43 PM
24. ### Breakeven exit strategy

Hi, I have a gambling problem (admitting it is half the battle, right?), that I hope someone can help me with. Suppose that I know from historical...

• Replies: 0
• Views: 2,521
07-18-2007, 01:22 AM
25. ### brownian motion in stopping time

Hello everyone! I am stuck with a little problem concerning BM and stopping time. :( If we define tau_n:=inf{t>=0 : |W_t|>=n}, does anyone have...

• Replies: 6
• Views: 3,698
07-15-2011, 12:41 PM
26. ### Buffon's Needle Experiment

This problem is quite interesting: A fine needle of length l is dropped at random on a board covered with parallel lines distance d apart where...

• Replies: 0
• Views: 8,520
10-04-2005, 02:08 PM
27. ### building a mailing response model

was hoping someone had any ideas on building a model on the following. let's say we have monthly mailings plus a holdout cell over a period of 12...

• Replies: 0
• Views: 1,668
04-26-2011, 12:17 PM
28. ### Building a Multivariate Exponential Distribution...

hey everyone! so when i asked about the Multivariate Poisson i was pointed in the right direction and was able to come up with a much decent answer...

• Replies: 2
• Views: 4,198
03-19-2012, 06:44 PM
29. ### Building a Multivariate Poission Distribution....

hello peeps. i know i haven't posted in like ages but i've been very, very VERY busy lately so i hope i get more time once the semester ends. ...

• Replies: 5
• Views: 3,058
03-16-2012, 01:03 PM
30. ### Building confidence intervals using Coefficient of variation

Hi I have a doubt and i need to understand it. At my work, my colleagues use the coefficient of variation for doing confidence intervals. Not...

• Replies: 7
• Views: 1,953
08-05-2014, 12:51 PM
31. ### Bunch of questions (just need help not answers)

Like the title says, I have a bunch of problems that I don't know how to solve. I learn from looking at examples and trying to figure it out (this...

• Replies: 9
• Views: 4,901
10-23-2008, 10:01 AM

Please tell me how to solve this question correctly (Q) Buses arrive at a specified stop at 15-minutes intervals starting at 7 a.m. That is, they...

• Replies: 1
• Views: 3,459
Ra0
10-28-2011, 03:18 PM
33. ### Business Predictability Scheduling Dilemma

Our business is working to change a longstanding practice of publishing fixed Buy Prices on a Quarterly basis. One of the impacts of this standard...

• Replies: 0
• Views: 1,270
06-08-2016, 09:57 AM
34. ### Business Stats question...desperate for help

My professor has assigned this problem and I have no idea what else to try. I have tried binomial distributions and poisson. It is in a chapter on...

• Replies: 1
• Views: 7,866
02-16-2009, 09:44 PM
35. ### Calculate a probability

There are 2n ball in the box, n black and n white. Now get 2 from the box(we call it one pair), then get another 2, ... continue until there is no...

• Replies: 2
• Views: 1,154
02-06-2013, 12:58 PM
36. ### calculate intersection sets of cell clones in samples?

Is it possible to calculate the probability of intersection sets in this setting? I have 44000 different cell clones in sample O, I don´t know how...

• Replies: 0
• Views: 367
07-27-2017, 06:58 AM
37. ### Calculate Prob's using multiple means and std dev's

Hi all. My first post. I'm trying to find a correct methodology for a problem and am a bit stumped as I don't really know how to frame it in a...

• Replies: 4
• Views: 2,550
02-15-2012, 09:03 AM
38. ### Calculate probability

an urn contains 5 red and 3 blue chips. suppose that 4 of these chips are selected at random and transferred to a 2nd urn, which was empty. if a...

• Replies: 0
• Views: 1,226
10-28-2012, 10:25 AM
39. ### Calculate probability in a concentrated group?

If a given group of patients, each suffering from a condition that makes them 14 times more likely than the general populace to commit one act of...

• Replies: 1
• Views: 1,317
07-11-2012, 03:10 PM
40. ### Calculate Probability of a value greater than knowing the Mean, St Deviation...?

I need to Calculate the probability of get 20000 or more with the following statistics; Statistics: Forecast values Trials 5,000 Base...

• Replies: 1
• Views: 2,288
BGM
03-27-2013, 02:58 AM
41. ### Calculate Probabilty of event

Hi !!! I have a prooblem and it seems the solution is simple but I need somebody else opinion. I have k groups of numbers from 1 to n . ...

• Replies: 0
• Views: 1,576
08-11-2009, 12:04 PM
42. ### Calculate the Expected value,Variance,density and 2nd moment

I have to solve this exercise. Here are also my solutions but I don't know if they're correct. Let Ω ⊆ R ^ 2 a finite set of points in R ^ 2....

• Replies: 3
• Views: 1,551
BGM
05-04-2013, 08:04 AM
43. ### calculate the probability of accident.

Suppose there are seven(distinct) accident occurs in a week. What is the probability that all accidents are occurred on the same day? Pls explain in...

• Replies: 6
• Views: 5,629
12-25-2011, 06:15 PM
44. ### Calculate the probability of collisions in an RF system?

Dear Sirs, I have a question in probability which i hope you can help me with: In a building there are N number of transmitters. Each such...

• Replies: 2
• Views: 3,881
11-05-2010, 08:34 AM
45. ### calculating $E(Y)$

suppose X is random variable non negative with Distribution function F_{X}(x) and Y is random variable with Distribution function...

• Replies: 1
• Views: 1,061
BGM
05-31-2016, 01:56 PM
46. ### Calculating "p-value"

Hello, I'm brand new to this site...and trying to figure out (I know this is probably very elementary to all of you) "What is the value that appears...

• Replies: 0
• Views: 2,718
07-29-2006, 10:51 AM
47. ### Calculating a posteriori probability for a three-urn problem

Hi, I am a psychology experimenter and I am having some deep trouble with a bayiasian probabillity calculation. I hope someone may help me. Thank...

• Replies: 3
• Views: 2,743
05-26-2011, 08:10 AM
48. ### Calculating a stochastic matrix with multiple states

I am struggling with how to calculate the values of a Markov matrix which has multiple states. For example, Imagine an unfair 6 sided dice. The...

• Replies: 1
• Views: 1,163
BGM
07-14-2015, 11:02 AM
49. ### Calculating a value given probability and type of random variable

Hello, "Let \overline{X} be the average of a sample of 16 independent normal random variables with mean 0 and variance 1. Determine a, such that...

• Replies: 1
• Views: 1,012
BGM
01-27-2013, 03:31 AM
50. ### calculating expectation and variance

Hi, I wanted to know if i'm on the right track with this problem. So far, for expectation I multiply 15/60 and 12. Not sure if this is correct....

• Replies: 4
• Views: 5,104
02-01-2009, 02:17 PM
51. ### calculating expected cell frequency multivariate normal distribution

How would I go about calculating the expected cell frequency of a discrete distribution (say, multivariate normal)? The 1-D analog would be the...

• Replies: 3
• Views: 1,004
BGM
03-05-2014, 07:48 AM

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