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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: 30,253
09-30-2005, 09:44 AM
1. ### Question regarding draws from a box

Hi, I'm a little confused about the following problem: You draw twice without replacement from a box containing four tickets, labeled '1', '1',...

• Replies: 2
• Views: 1,622
10-19-2012, 11:22 AM
2. ### Do u know a statistical distribution with exponential moment generating function

Hi When I involve with a problem about limiting distribution of Gama, I encounter with below moment generating function:...

• Replies: 1
• Views: 1,060
BGM
10-19-2012, 03:00 AM
3. ### Covariance of a linear comb. of independent variables

U = y1 - 2y2 + y3 W = 3y1 + y2 E = 1, E = 2, E = -1, Var = 1, Var = 3, Var = 5 Var(U) = 12, Var(W) = 12 ;I hope y1, y2, y3 are Independent RV's...

• Replies: 2
• Views: 1,735
10-18-2012, 10:48 PM
4. ### Probability & (possibly) Binomial Distribution

Problem: A certain drug causes kidney damage in 1% of patients. Suppose the drug is to be tested on 50 patients. Find the probability that: (a)...

• Replies: 2
• Views: 4,649
10-18-2012, 06:11 PM
5. ### distributions of Markov Chain

Hello!I am very confused with the terms initial distribution,limiting distribution and stationary distribution of a Markov Chain. Is initial...

• Replies: 1
• Views: 1,349
BGM
10-18-2012, 12:37 PM
6. ### Can some one please solve part b and c of this probability question

Can some one please solve part b and c of this probability question?? Thanks The Myers Briggs type indicator has been used to measure...

• Replies: 3
• Views: 1,584
10-18-2012, 12:00 PM
7. ### Probability & Binomial Distribution?!?!

I just want to know if my line of thinking is correct: Observational unit: Fruitflies 30 % black mutated body color 70 % gray nonmutated body...

• Replies: 1
• Views: 2,771
10-18-2012, 10:07 AM
8. ### Horse Racing Problem

I break down horse races into two horse races and my probabilities are fairly accurate. I have been wrestling with how to convert all these...

• Replies: 3
• Views: 3,207
10-17-2012, 10:02 PM
9. ### Exponential Distribution - Moment Generating Function

I have a rate of .5, and three sample size scenarios (16,36,100). I am trying to find the exact distribution of the average time by using an MGF. ...

• Replies: 3
• Views: 3,806
10-17-2012, 07:37 PM
10. ### Independency and flipping a coin that might be a biased coin

Setup: There are two coins in an urn: A fair coin and a biased coin that lands Heads with probability q. At time 0, we choose a coin at random, and...

• Replies: 0
• Views: 1,075
10-17-2012, 02:07 PM
11. ### Verification & Specification

Hi, I've been given a bunch of problems for homework and I'm stumped on the last one, any assistance will be greatly appreciated. Verify that: ...

• Replies: 2
• Views: 1,479
10-17-2012, 12:21 PM
12. ### Need help with contingency tables

I'll do all the math in the contingency tables but I got this question and I'm stumped on how I should set the tables up, any advice would help a...

• Replies: 0
• Views: 1,285
10-16-2012, 09:38 PM
13. ### convergence in probability and strong convergence in the discrete case

Show that if you have convergence in probability, then you also have strong convergence in the discrete case. I know that the discrete case means...

• Replies: 4
• Views: 2,263
BGM
10-16-2012, 03:52 AM
14. ### Bayesian probability question about Dirichlet prior distributions

Hi there, I have a question about Bayesian probability. I have a list of the starting times of journeys. I binned the data into 15 minute...

• Replies: 2
• Views: 1,698
10-16-2012, 03:38 AM
15. ### Uniform Distribution with Convergence

I am trying to Prove that {Wn} converges in distribution to W. Wn has the following density: (1 + x/n) / (1 + 1/2n) In essence, I am trying to...

• Replies: 8
• Views: 1,876
10-16-2012, 02:32 AM
16. ### Find the Probability that the system fails

The figure below is a representation of two subsystems operating in parallel. Each subsystem has two components that operate in series. Subsystem A...

• Replies: 1
• Views: 1,782
10-16-2012, 02:19 AM
17. ### Gamma, Exponential, Oh My!

I have the answer already, but I wan't to understand how this actually works. "Suppose that X, given Y = y, is distributed Gamma(a, y) and that...

• Replies: 1
• Views: 1,744
10-15-2012, 09:57 PM
18. ### Need help with Uniform probability distribution

Hey guys... I'm sort of confused about these two problems. If you guys can help me out that would be great. Problem: Suppose X is a random...

• Replies: 2
• Views: 2,549
10-15-2012, 12:22 PM
19. ### Bayesian conclusion scale with uneven data distribution. Possible?

I have two sets of data distribution between 0 to 100%. I was thinking of using the Bayes theorem of explaining the data distribution. More info on...

• Replies: 4
• Views: 1,860
10-15-2012, 06:11 AM
20. ### Central Limit Theorem and Exponential Distribution

Exponential Distribution with lambda = 1/2. Use the central limit theorem to estimate the probability that the average service time of the first n...

• Replies: 1
• Views: 3,883
10-15-2012, 02:33 AM
21. ### Computing pobabilities for any normal probability Dist.

Greetings all, I am a math challenged individual in the middle of a stats class and (you've heard it before) seriously struggling with story...

• Replies: 2
• Views: 4,712
10-14-2012, 03:23 PM
22. ### Independent events occurring simultaneously

Hey guys, I saw a similar question on the site, but still need some help with my own. Here it is: Consider a double computer intruder detection...

• Replies: 2
• Views: 2,714
10-14-2012, 02:32 PM
23. ### Conditional Expectation

I will keep it simple... Suppose the Joint PMF is: 1/2 x = -4, y = 1 1/2 x = 6, y = 7 I have already computed several actual values for...

• Replies: 1
• Views: 1,296
BGM
10-14-2012, 12:04 PM
24. ### sampling - distribution of sample mean

How do I solve this? I'm a little confused by the question itself too. A student's performance is equally good in both subjects. The marks she might...

• Replies: 1
• Views: 1,321
BGM
10-14-2012, 11:53 AM
25. ### Help with question in combinatorics

Hi, Got the following question, I'm sure it's pretty simple but can't get to a solution :( There's a monthly employment survey, conducted by...

• Replies: 1
• Views: 1,459
BGM
10-14-2012, 11:49 AM
26. ### 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: 1,791
10-13-2012, 10:13 AM
27. ### Binomial distributions

A total of 16 mice are sent down a maze, one by one. From previous experience, it is believed that the probability a mouse turns right is .38 a)...

• Replies: 1
• Views: 4,443
10-12-2012, 09:25 PM
28. ### estimating population from hash table fill rate

Apologies if this is the wrong forum, but it looks reasonably close. I have a practical problem to estimate the number of actual entries in a...

• Replies: 3
• Views: 1,851
10-12-2012, 08:13 PM
29. ### Need help showing my work

A new study by Square Trade indicates that smartphones are 50% more likely to malfunction than simple phones over a 3 year period. Of smartphone...

• Replies: 1
• Views: 1,940
BGM
10-12-2012, 04:40 AM
30. ### Probabilty of Hard Drive Failure

Thank you in advance. It's been a while since I've engaged in any probability problems, so I appreciate your help. Problem: I have two hard drives...

• Replies: 1
• Views: 3,583
BGM
10-12-2012, 04:39 AM
31. ### Maximum Likelihood Estimate For A Poisson Mass Function ...

with mean μ is ((μ ^ x) * ((exp) ^ -μ)) / x! The log likelihood is x * log(μ) − μ. (Answer) How do I arrive at the log likelihood provided? ...

• Replies: 2
• Views: 1,449
10-11-2012, 03:00 PM
32. ### Please help me to judge if a 'random' draw was fixed !

40 teams are taking place in a knock-out competition in which there is no seeding. They all have rankings determined by previous performance. The...

• Replies: 1
• Views: 1,117
10-11-2012, 09:26 AM
33. ### how can i calculated the expected duration?

hi, my name is ghder alshreef, i'm a searcher from Egypt and my intersted about stochastic process specially random walk models, and i need to...

• Replies: 0
• Views: 2,290
10-11-2012, 03:58 AM
34. ### Probability Question- Positive/Negative Disease

One percent of all individuals in a certain population are carriers of a particular disease. A diagnostic test for this disease has a 97 % detection...

• Replies: 4
• Views: 4,577
10-10-2012, 11:58 PM
35. ### Tricky question on probability?!

A fair dice with 6 sides is rolled a certain number of times and the numer 1-6 is recorded each time it is rolled. Which of the following sequences...

• Replies: 13
• Views: 3,215
nyo
10-10-2012, 08:35 PM
36. ### Expected Value - Multiplication

Given the following input: (E + E) * (E+E) Is my output: EE + EE + EE + E^2 I know if I multiply INSIDE the expected value ( E = E + E),...

• Replies: 2
• Views: 3,992
10-10-2012, 07:19 PM
37. ### Poisson distribution help please! :)

I can't figure this one out. Can someone help me please? Thanks! One model for plant competition assumes that there is a zone of resource depletion...

• Replies: 1
• Views: 3,280
10-10-2012, 06:34 PM
38. ### What is variance of X-bar^2, if X ~ N(theta, sigma^2), sigma is known?

I want to calculate variance of X-bar^2, (mean of X)^2, when Xi ~ Normal(theta, sigma^2) and sigma is known. plz help.

• Replies: 3
• Views: 6,885
10-10-2012, 10:02 AM
39. ### Help...

I'm not sure how to set up this binomial probability problem. I hope there is a good probability that someone can point me in the right direction. ...

• Replies: 4
• Views: 6,114
10-09-2012, 09:55 PM
40. ### Probability of selecting buckets with items

Given n buckets, each bucket containing m items, we want to select k items. Selecting an item means that the corresponding bucket is selected too. ...

• Replies: 7
• Views: 1,931
BGM
10-09-2012, 09:05 AM
41. ### Probability after being given an initial condition

This is a question I have received on my test and I am not sure whether or not my answer is correct. question: you are given 3 bags. First bag...

• Replies: 1
• Views: 1,590
BGM
10-08-2012, 11:44 PM
42. ### Elementary probability question (combinations)

A set of plastic picnic cutlery is mixed in a bag. There are 4 brown spoons, 5 green forks, 6 brown knives, 3 blue forks and 7 pink spoons. ...

• Replies: 2
• Views: 1,811
BGM
10-08-2012, 04:51 PM
43. ### Poisson distribution question on lambda

An office printer has a paper jam on average 2 times in 3 weeks. THe number of paper jamsfollows a poisson distribution Findd the probabilitythat...

• Replies: 5
• Views: 2,689
10-08-2012, 06:32 AM
44. ### Bionomial distribution:expected value problem question

: The FBI Standard survey of crimes shows that for about 80% of all property crimes, the criminals arenever found and the case is never solved....

• Replies: 3
• Views: 4,695
10-08-2012, 04:48 AM
45. ### Moment Generating Function (DISCRETE)

P(X = 2) = 1/2 P(X = 5) = 1/3 P(X = 7) = 1/6 Compute Mx(s) for s an element of Real Numbers. I am under the impression that the Moment...

• Replies: 3
• Views: 2,012
10-08-2012, 01:42 AM
46. ### Will two Independent Variables transformed into two functions remain independent?

X & Y are independent variables. X ~ Bernoulli(1/2), Y ~ Bernoulli(1/3). Let Z = X + Y and W = X - Y. Compute Cov(Z,W) and Corr(Z,W). Am I...

• Replies: 16
• Views: 3,045
10-07-2012, 11:36 PM
47. ### Hi Probability experts..... Can you solve this problem.

Hi lads, I'm looking to solve this probability problem. Nobody i've given it to has solved it yet, and I'm a maths teacher, and I can't solve it....

• Replies: 2
• Views: 2,386
10-07-2012, 11:23 AM
48. ### Expected Value - Binomial and Poisson

EDIT: I have confirmed the answer is correct, help is no longer needed. Thank you. I think I have this right and am just looking for a 2nd set of...

• Replies: 1
• Views: 1,735
10-07-2012, 01:11 AM
49. ### Math Symbols - R1 --> R2

What does the symbol R mean in the following description: "Let X be a discrete random variable, and let g : R^1 -> R^1 be some function ... " ...

• Replies: 4
• Views: 11,404
10-07-2012, 12:34 AM
50. ### Question about mutually exclusive probability

How do i find mutually exclusive probability? it says in my book that if p(A or B) = p(a) + p(b) then the events are mutualy exclusive. Or does it...

• Replies: 14
• Views: 6,784
10-06-2012, 08:19 PM
51. ### Probability help sovling a problem.

When the child is between 29 and 53 months, for each hour of TV watched per week, waist circumference increases by a mean of 0.43 mm. This increase...

• Replies: 1
• Views: 1,253
10-05-2012, 03:53 PM
52. ### What test can predict the outcome of two teams with different win percentages?

There are two teams in a ten team league. Team A has an overall win percentage of .688 Team B has an overall win percentage of .523 In...

• Replies: 2
• Views: 978
10-05-2012, 02:51 PM
53. ### JaVale McGee

Hey friends. I decided that being an NBA all-star, author, rapper, actor, father, role model, PhD, and Nobel Prize winner wasn't enough. So I...

• Replies: 7
• Views: 1,724
10-05-2012, 01:10 PM
54. ### Question on probabiltiy terminology

Just wondering, Does "Neither" In probability always mean p( a and b)? Consider the following non-mutually-exclusive event A basket of 14...

• Replies: 1
• Views: 1,036
10-05-2012, 08:49 AM
55. ### Statistics normal distribution question

It has been found that to much TV increases a childs waist size When the child is between 29 and 53 months, for each hour of tv watched per week,...

• Replies: 1
• Views: 1,205
10-04-2012, 02:17 PM
56. ### smarties

Hi there, You have a bag of 20 smarties(chocolate candies), the smarties have 8 different colours. We know that the fill process of the bag in the...

• Replies: 1
• Views: 1,106
BGM
10-04-2012, 07:35 AM
57. ### pop quiz

Shaq is studying for a nursing qualifying exam that will consist of 20 distinct questions selected at random from a list of 40 that the professor has...

• Replies: 1
• Views: 1,457
BGM
10-04-2012, 02:52 AM
58. ### a discrete RV pdf

The pdf of a discrete random variable is the following: f(x) = 36/(49x^2), for x = 1,2,3 What is the cdf of x? I'm not sure but I think...

• Replies: 1
• Views: 892
10-03-2012, 10:58 PM
59. ### Some Help

Please. I think I am having a mental cramp right now. I want to know when are the times you subtract 1-so and so? The examples are below. Mean...

• Replies: 1
• Views: 4,541
10-03-2012, 09:14 PM

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