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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: 30,371
09-30-2005, 09:44 AM
1. conditional probability

hi, well i've just started to mess around the probabilities and the problem i don't understand is : if a probability for a person to finish his...

• Replies: 2
• Views: 2,256
03-19-2010, 02:40 AM
2. Probability and forward error correction by parallel transmission

I need a formula to express the probability of being able to correct single digit errors in a transmitted string of digits by transmitting the string...

• Replies: 0
• Views: 1,271
06-28-2014, 08:27 AM
3. Poisson. Calculate expected frequency problem.

I've decided to brush up on my statistics recently by jumping right in the middle of it, and I landed on the normal distribution. I have this...

• Replies: 4
• Views: 10,373
06-15-2009, 09:07 AM
4. Pollutants in auto exhausts.

Hello all - I am in need of some assistance with a probability problem. I am thoroughly confused and I don't know what to do. Any help is...

• Replies: 2
• Views: 16,552
10-25-2009, 11:26 AM
5. Joint Density f(X,Y) integration when there is no Y in the eqn

Hi I'm having difficulties with integration by parts when the main function of a joint distribution doesn't contain the Y. Here it is: Let X and Y...

• Replies: 24
• Views: 8,670
BGM
02-14-2011, 04:09 AM
6. Movement in Consumer Choice / Markov Chain??

I'm trying to determine a way to model the choice behavior of a group of individuals whose choices are based on a 5-point scale (i.e. they can select...

• Replies: 1
• Views: 2,374
08-06-2008, 04:03 PM
7. probability density function questions...

Suppose X selects an integer, x, uniformly from the set S = {0,1,...,9}. Then Y selects an integer uniformly from {0,1,...,x^2}. Find: (a) f(x,y) ...

• Replies: 1
• Views: 2,186
03-08-2012, 12:14 AM
8. lock combinations Q- for fun, not work

Suppose I want to crack a safe. What I know: The lock has numbers ranging from 0-75 The numbers can be repeated What I don't know: Whether...

• Replies: 0
• Views: 1,605
03-09-2012, 05:34 PM
9. 3 Norm Dists (correlated), prob co-occurence of 1% right tail

Hi, hoping someone can lead me in the right direction.. I'm looking at three normal distributions, specifically looking at the 1% extreme in each...

• Replies: 2
• Views: 2,308
10-21-2009, 05:15 PM
10. Need some help thinking ...

As funny as that sounds, it's actually been a while since my stat classes. This actually isn't a homework question, I'm just trying to analyse some...

• Replies: 0
• Views: 1,377
05-06-2011, 01:53 PM
11. Need help on stat, I will compensate

hey guys, I need some tutoring before my stat final next week, the topics include: Inventory models (service levels, quantity discounts,...

• Replies: 0
• Views: 2,554
05-09-2009, 01:23 AM
12. A problem about expected value

given two variables satisfying uniformly distribution as p1~U(0,a1),p2~U(0,a2), there is a random variable defined as s=(a1*p2-a2*p1)/(p1+p2). ...

• Replies: 0
• Views: 1,918
11-24-2006, 08:00 AM
13. Probability help

Hey guys I'm new to this site, and I could really use some help! I am currently in a stats class and I'm so terrible with numbers it's not even...

• Replies: 2
• Views: 1,789
01-16-2014, 09:35 AM
14. Predicting probability with standard deviations, mean high and low values.

I registered on this forum specifically to ask this question. This is not homework, it's simply a for fun/hobby problem I am trying to solve. This...

• Replies: 5
• Views: 5,253
06-14-2013, 03:55 AM
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: 1,346
06-17-2015, 10:15 PM
16. probability

ok so the question says; find the probability that exactly two heads appearing in two tosses of a fair coin............... is the answer a half???...

• Replies: 1
• Views: 2,270
02-24-2012, 11:26 PM
17. Probability (compound event)

Question: the event A&B are such that P(A)= x+.2 P(B)= 2x + .1 P(AnB)=x a) Given that P(AuB)= .7 find the value of x OK I DON'T EXPECT ANYONE...

• Replies: 12
• Views: 2,706
02-27-2012, 07:56 PM
18. binomial probability

ok so here is the question i attempted but no getting the answer a loan officer has indicated that 80% of all loan application forms have zero...

• Replies: 0
• Views: 2,439
03-19-2012, 06:48 PM
19. System Response Time Alerts - Choosing a Statistical Method

Hi It's been a long time since I had to use statistics in anger, so please bear with me. I have a test running that measures the response time of...

• Replies: 1
• Views: 1,374
01-18-2016, 03:05 PM
20. distribution

Distribute six energy units to four different states, 0ε, 1ε, 2ε, 3ε, with the constraint that the total energy of the system is equal to 4ε which...

• Replies: 0
• Views: 1,395
04-19-2012, 03:19 PM
21. Probability HW

Hi, I need some help figuring out the inclusion probability. Here is the problem: Unequal probability sampling is often unavoidable, so it is...

• Replies: 0
• Views: 2,460
10-13-2010, 07:42 PM
22. Binomial probability question

Hi all, I have been stumped on this binomial probability question and was wondering if anyone can help me get started: I was thinking...

• Replies: 2
• Views: 1,901
12-04-2013, 02:48 PM
23. How to obtain variance estimator

Suppose we have the following ml estimator for beta beta = (lambda - c(1-lambda)) / p beta and lambda are proportions, c is a constant...

• Replies: 0
• Views: 2,212
06-17-2008, 03:55 AM
24. Probabilities from Distribution Functions

Buses arrive at ﬁfteen minute intervals starting at noon. Anne arrives at the bus stop X minutes after noon, where X is a random variable with...

• Replies: 1
• Views: 2,406
09-22-2013, 05:06 PM
25. Probability of irregular 10-sided die

I've got an odd question here: I've got a 10-sided die with sides labeled as such: -1, 0, 0, 0, 0, 1, 1, 1, 1, 2 Thus, the odds for a single die...

• Replies: 1
• Views: 1,898
08-05-2013, 11:05 AM
26. multivariate mutual information

Hello everyone :wave:, I wonder if the equation concernat multivariate mutual information MI (X, Y, Z) = MI (X, Y) - MI (X, Y | Z) is the same...

• Replies: 1
• Views: 2,620
08-25-2011, 07:01 AM
27. Problem with calculate joint probability

Hello I have a problem with calculating joint probabilities in text mining. i have two paralel text like this for example Bonjour les bons amis ...

• Replies: 0
• Views: 1,296
04-02-2013, 11:49 AM

"For fans who visit the celebrity facebook page, 15% will click the ad on the page. Each click on the ad link will generate a $0.05 income. For a... • Replies: 3 • Views: 1,553 BGM 02-29-2012, 05:49 AM 29. Card Problem--(More than meets the eye...hopefully) Hmm, wondering if anyone can solve this problem, and possibly know which game show it came from: Say that you have 3 cards you can choose from:... • Replies: 2 • Views: 3,263 12-14-2007, 07:45 PM 30. Probability of relations in a network Imagine i have a predicate$friends(p_1, p_2)$and I know that$p(friends(p_1, p_2)) = p_1$. If I generate a world of$n\$ people, I expect there to...

• Replies: 0
• Views: 948
05-08-2015, 07:29 AM
31. Compound Probability

Hey guys, i am having a bit of trouble with this basic probability question which shows that i do not understand the basics at all. The question...

• Replies: 4
• Views: 1,434
04-26-2015, 10:01 AM
32. Probability of selecting two different colored balls

Given an urn with x red balls, and y green balls, thoroughly mixed, what is the probability of choosing two colors in the first two picks, when the...

• Replies: 12
• Views: 2,920
BGM
02-25-2014, 10:20 PM
33. Permutation problem?!

Hi all, I've been working on two problems that are really stumping me, and would really appreciate some help. Here is the problem, A computer...

• Replies: 3
• Views: 1,305
07-09-2012, 04:41 PM
34. Membership in group

This is from the Bertsekas Intro Probability book, 1st ed. How do you approach this problem? A class has 4 grad students and 12 undergrad...

• Replies: 4
• Views: 2,654
12-15-2010, 06:39 PM
35. Comparison of variability of synthetic and real data

Hello, I'm trying to compare a real dataset with a random (synthetic) distribution to determine whether a pattern I see in the data is real or the...

• Replies: 0
• Views: 1,267
02-05-2014, 03:36 PM
36. "Hepatitis" and "Golf" probabilities.

I'm having some trouble with these... A test for Hepatitis A is 98% accurate: if a person has Hepatitis, the test will come out "positive" with...

• Replies: 7
• Views: 6,749
06-01-2008, 06:51 PM
37. Golf Probability Again

This problem is really bothering me cause I can't figure it out at all...so I'm gonna try reposting it if that's ok: Harry is an employee at a...

• Replies: 4
• Views: 1,992
06-02-2008, 03:44 PM
38. test question

At a large department store, the average number of years of employment for a cashier is 5.7 with a standard deviation of 1.8 years and the...

• Replies: 1
• Views: 5,877
10-17-2010, 11:18 PM
39. Previously Posted Question

I am trying to view the attachments that are connected to this previous thread. Can anyone help. http://www.talkstats.com/showthread.php?t=1301 ...

• Replies: 1
• Views: 2,560
05-21-2007, 02:38 AM
40. Am I doing this right?

:confused: Im not sure if im doing this right. This is the question that I am working on right now. You wish to open a new restaurant and are...

• Replies: 1
• Views: 2,572
07-04-2007, 01:44 AM
41. Probability question (league related)

I have a question that I figured I post to see some other people opinions. I'm part of a sport where there are multiple individual leagues of 12...

• Replies: 1
• Views: 2,938
12-08-2005, 03:26 PM
42. I have a probability problem I need help in

I figured out most of it need help in other parts

• Replies: 3
• Views: 1,669
07-30-2012, 01:31 PM
43. 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: 6,045
BGM
04-28-2010, 12:49 AM
44. customer service problem

N customers circulate in a closed system with two servers. In Server 1 and Server 2, service times are exponential with parameters µ1 and µ2,...

• Replies: 0
• Views: 900
04-17-2012, 09:12 PM
45. Dice probability with limited reroll

Hello, I'm having difficulty understanding this problem and I was wondering if someone had an answer. Let n = \text{Number of dice} = 3 p_s...

• Replies: 2
• Views: 1,624
03-23-2016, 12:13 PM
46. 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: 2,552
BGM
05-22-2010, 04:26 AM
47. poisson probability problem

I have constructed this experiment to better understand poisson probabilities. Problem: There are two sets of data: lets choose a poisson type...

• Replies: 1
• Views: 2,724
02-16-2008, 04:00 PM
48. conditional expectation given sum

Hello, I need your help. Suppose: X\sim N(0,\sigma^2_x), Y\sim N(0,\sigma^2_y) , X, Y are independent, and c\in R. I need to find an...

• Replies: 0
• Views: 2,256
07-28-2016, 03:58 PM
49. Dice probability

Hello people, I have a very simple probability question that I need to solve a problem (recreational mathematics). Anyway, I would like to know how...

• Replies: 3
• Views: 2,018
BGM
09-08-2011, 11:52 AM
50. Expected value of logarithm of determinant of Wishart-distributed matrix

Does anyone know a simple, or at least tractable, formula for E, where W is a real Wishart-distributed matrix? It seems like there ought to be one,...

• Replies: 3
• Views: 4,923
BGM
11-27-2011, 11:52 PM
51. Generalized multivariate t / Pearson Type VII distribution with vector d.f.?

Does anyone know if there's such a thing as a multivarate t or Pearson Type VII distribution with vector-valued rather than scalar-valued degrees of...

• Replies: 0
• Views: 2,301
04-07-2012, 11:08 AM
52. Binomial probablity

According to National Highway traffic Safety Administration 66% of California motorists use seat belts. Find the probablity that in one group of 12...

• Replies: 1
• Views: 2,820
12-27-2006, 12:20 AM
53. Process capability without variability in data?

My company uses Cpk to judge process capability, with a 1.33 Cpk being the acceptable minimum for most processes. In some cases, we do not have...

• Replies: 5
• Views: 7,408
09-11-2009, 06:41 AM

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