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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: 30,234
09-30-2005, 09:44 AM
1. Probability and quality control

Hi all, I am simulating a process in Arena software. One part of the process has a delay of a normal distribution of mean 4 minutes with a...

• Replies: 1
• Views: 1,432
08-03-2012, 11:07 PM
2. Help in understand this formula

Hello to all, I'm working on a problem which is as follow: There is a buffer which has maximum K capacity to store items. When a request for an...

• Replies: 1
• Views: 773
08-03-2012, 10:20 AM
3. Die probabilistic

i am reading Mostellers book on 50 difficult probability questions. the question I am struggling with is on the average, how many times must a die be...

• Replies: 8
• Views: 1,940
08-02-2012, 04:57 PM

Dear All Please give your attention to following and help. There are white(9/16) and black(7/16) balls in box with probabilities...

• Replies: 2
• Views: 1,789
08-02-2012, 08:05 AM
5. Joint Distribution

Hi,I need some help here: Toss a fair coin twice. Define X,Y and Z as : X=1 if HH or HT X=0 if TH or TT Y=1 if HH or TH Y=0 if HT or TT

• Replies: 5
• Views: 1,904
08-01-2012, 08:03 PM
6. show P(N>n)=P(X_(n:n)−X_(1:n)<α)

suppose X1,X2,… is sequence of independent random variables of U(0,1) if N=min{n>0:X_(n:n)−X_(1:n)>α,0<α<1} that X_(1:n) is smallest order statistic...

• Replies: 0
• Views: 29,037
08-01-2012, 08:58 AM
7. Normal Approximation

edit: Nevermind... apparently the answer key is wrong...

• Replies: 1
• Views: 1,504
07-31-2012, 10:19 PM
8. finding E(N) in this question

suppose X1,X2,… is sequence of independent random variables of U(0,1) if N=min{n>0:X_(n:n)−X_(1:n)>α,0<α<1} that X_(1:n) is smallest order statistic...

• Replies: 0
• Views: 1,472
07-31-2012, 06:38 PM
9. random variables - expected value of time taken to perform a service

Hello everyone, My name is Alex, I am from Spain and I need help. I am not trained in statistics and all I know is a little bit from school and...

• Replies: 5
• Views: 2,015
07-31-2012, 01:35 AM
10. 'Bayesian version' of the Cramer-Rao lower bound?

just wondering if there is some sort of "Bayesian version" of that very useful and popular result that people use in maximum likelihood, the...

• Replies: 3
• Views: 2,761
07-30-2012, 10:00 PM
11. I have a probability problem I need help in

I figured out most of it need help in other parts

• Replies: 3
• Views: 1,653
07-30-2012, 01:31 PM
12. placing data into which distribution?

Hello all, I have two sets of data, which are divided by a single category. I want to be able to place further observations into one of these...

• Replies: 1
• Views: 1,009
07-30-2012, 01:05 PM
13. Rejection with mean and standard dev given

So I am having a little brain fart. The problem reads, The snack pack of potato chips is advertised to weigh 3.5oz . The weights are normally...

• Replies: 1
• Views: 1,494
07-30-2012, 12:17 PM
14. "Naturally occurring" left-skewed distributions?

hello there. for thesis purposes i'm finding myself with the need to simulate left-skewed distributions with a level of skewness i can determine...

• Replies: 2
• Views: 3,690
07-30-2012, 12:04 PM
15. Lottery 'week intervals'

This strikes me as an interesting (though potentially tricky) lottery question that I'm having trouble getting my head around. Many state...

• Replies: 0
• Views: 2,035
07-29-2012, 12:36 AM
16. how do design an experiment given a previous one

hello my question is : i have preformed an experiment on an electronic device. the experiment was running the device 110000 cycles in which i...

• Replies: 0
• Views: 2,271
07-27-2012, 09:37 AM
17. Conditional probability Question

Hi Guys, Could I ask a question with regards to probability theory? I have recorded some journey distances for cars. Here is an example. The...

• Replies: 1
• Views: 1,234
07-26-2012, 01:35 PM

• Replies: 0
• Views: 1,374
07-26-2012, 08:21 AM
19. Confidence Help

I am trying to make some observations from a data set of independent and dependent variables. Using its S and AD Test statistic, the set of natural...

• Replies: 0
• Views: 1,090
07-25-2012, 01:40 PM
20. Stick breaking constriction probability

Hi Guys, Could I ask a question with regards to probability theory? I have recorded some journey distances for cars. Here is an example. The...

• Replies: 0
• Views: 1,394
07-24-2012, 08:02 AM
21. combinatorics ...

Hey guys here's my confusion, any help clearing it up would be wonderful ... :) Let's say you've got 2 * 6-sided dice The sample space is 6^2 =...

• Replies: 2
• Views: 1,552
07-22-2012, 11:21 PM
22. Probability Question. Help!

I have two questions that I'm stuck on: Question #1: Assume you have applied for two scholarships, scholarship A and scholarship B. The...

• Replies: 1
• Views: 1,152
07-22-2012, 08:21 PM
23. PDF of the sum of random variables

Hello everyone, here is the problem I'm currently working on: I'm stuck on (b). I tried to find the CDF of Y first, is something like this in...

• Replies: 1
• Views: 1,539
07-21-2012, 11:59 AM

I have this quiz due in a couple hours and Im stuck on these last two problems 1) During a certain period of time, the probability that the Food...

• Replies: 2
• Views: 1,126
07-20-2012, 05:45 PM
25. Probability that one random variable is greater than another

I need to find the probability that a normally-distributed random variable is greater than a uniformly-distributed random variable. That is: X...

• Replies: 2
• Views: 4,046
b_d
07-20-2012, 12:52 PM
26. Probability, Complements, Combinations, and Permutations (Quick Question)

I have a population of 200 checks. Five checks are fraudulent. I select a sample of 5 checks (without replacement) What is the probability that all...

• Replies: 0
• Views: 2,565
07-20-2012, 10:15 AM
27. Normal Distribution Probability for a large sigma

My question seems simple, but I'm not getting what I want. I want to know the area under the curve, to the right of x. (1-pnorm) The...

• Replies: 2
• Views: 1,961
07-19-2012, 08:51 PM
28. cant tell if i am on right track for this prababilitly hw assigment help would good!

I was recently given a hw assigment dealing with the price is right's "money game". The contestant is shown nine cards on a board. Each card has one...

• Replies: 2
• Views: 1,534
07-18-2012, 05:32 PM
29. Combining Bernoulli distributions

I'm looking for a way to find the standard deviation of a certain distribution. This distribution is created by performing n_0 Bernoulli trials with...

• Replies: 4
• Views: 1,676
07-18-2012, 03:20 PM
30. mixture modelling

Hello, I would like to know that kind of software exists for mixture modelling? Thank you for any help that you can provide. Best wishes,...

• Replies: 0
• Views: 1,475
07-18-2012, 07:24 AM
31. Separation a mixture of two distributions

Hello, I have 95 data points from my measurements. I plotted a histogram. It looks like a mixture (superposition) of two distributions (normal and...

• Replies: 1
• Views: 1,430
07-18-2012, 05:38 AM
32. having a bit of brain freeze with this

Length of metal strips produced by a machine are normally distributed with mean length of 150 cm and a standard deviation of 10 cm. Find the...

• Replies: 2
• Views: 5,981
07-17-2012, 04:19 PM
33. find area under non-standard normal curve (i.e. units not percentages)

Hello, I would like some advice on how to calculate the area under a non-standard normal curve, in its own units, not relative to a...

• Replies: 1
• Views: 1,823
07-17-2012, 08:36 AM
34. Probability question with a definite outcome

So I'm having trouble calculating the probability of the following scenario: I have 4 possible locations for 4 boxes. Each of these boxes may...

• Replies: 2
• Views: 1,442
07-16-2012, 11:07 PM
35. Roulette probability question

Ok, so here is what I want to know: I have seen probability stats about the odds of a roulette wheel landing on either red or black consecutively,...

• Replies: 4
• Views: 2,556
07-16-2012, 06:12 PM
36. The multi-factor model is a multivariate gaussian distribution?

I'm sure that the following question is trivial, but I can't found a solid demonstration. Can we state that multi-factor model is a multivariate...

• Replies: 1
• Views: 2,421
07-16-2012, 11:11 AM
37. Need help!!!!!

..........

• Replies: 1
• Views: 1,421
07-15-2012, 09:33 AM
38. probability question

A producer checks the quality of his products on a daily basis like this: first he checks 5 items randomly, and if no defects are found, he...

• Replies: 1
• Views: 1,452
07-13-2012, 12:05 PM
39. bins and balls

Working a problem from a text that asks if you have n balls and place them in n bins, what is the probability that exactly one bin remains empty. ...

• Replies: 0
• Views: 2,635
07-12-2012, 10:44 PM
40. censored data

You put a simple defect into a car and have six randomly selected auto repair shops from city X look at it, one after the other. All six want to...

• Replies: 2
• Views: 1,626
07-12-2012, 12:28 PM
41. Question about hidden markov model

Hi guys, I have written a hidden markov model class in c++, the tests for evaluation and decoding problems was ok, but the train method wich i used...

• Replies: 0
• Views: 1,467
07-12-2012, 10:53 AM
42. A lottery question.

So, I'm trying to help out a Euromillions syndicate to understand the probabilities of their different play options. The basic Euromillions lottery...

• Replies: 1
• Views: 1,491
BGM
07-11-2012, 03:21 PM
43. 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: 1,323
07-11-2012, 03:10 PM
44. Random walk?

In a gambling game , you can win 1$in each round with probability 0.6 or lose 2$ in probability 0.4. suppose you start with 100\$. find the...

• Replies: 1
• Views: 1,918
07-11-2012, 04:29 AM
45. Cards (probability)

What is the chance that the fifth card from the top of the deck will be a heart? Here is my attempt (I think it's outright wrong at the moment......

• Replies: 3
• Views: 1,816
07-10-2012, 05:34 PM
46. what is answer of this sequence?

what is answer for this sequence when we know the related series is 1/e. a_n = 1-1/1! +1/2!+...(-1)^n/n! Regards,

• Replies: 4
• Views: 1,825
07-10-2012, 06:58 AM
47. 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: 1,280
07-09-2012, 04:41 PM

Hello all, I have been struggling with this problem for a while and I would really appreciate it if you can explain it to me. A computer hacker...

• Replies: 0
• Views: 2,573
07-09-2012, 03:53 PM
49. Ratio of two Cauchy random variables.

Hello. I'm trying to find the probability density function (pdf) of the random variable U = X/Y where X and Y are both iid Cauchy random...

• Replies: 2
• Views: 4,058
07-09-2012, 02:29 PM
50. approximating a density by using a mixture density

Is there any journal article discussing approximating a density by having a mixture density? Or even an exact conversion? I plotted a mixture...

• Replies: 1
• Views: 1,149
07-08-2012, 02:57 PM
51. Median and Mean of Independent Random Variables

Hello, Here is the question: Let X_1,X_2, . . . ,X_n be random variables with the density \frac{1}{1+x^2} for x \in ({-\infty},{\infty}) ;...

• Replies: 5
• Views: 8,356
07-08-2012, 09:54 AM
52. Interesting pdf question

Z1,....,Z12 are iid standard normal What is the pdf of Z1/(Z2+Z3) + Z4/(Z5+Z6) + Z7/(Z8+Z9) + Z10/(Z11+Z12) My thoughts are the...

• Replies: 2
• Views: 2,601
07-08-2012, 09:05 AM

-Resolved- Thanks

• Replies: 1
• Views: 1,624
07-07-2012, 07:07 PM
54. Binomial Distribution Analysis Question

Hi everyone. I have a couple of questions and would greatly appreciate it if you could help me out! First, I'll provide some information: ...

• Replies: 4
• Views: 11,592
07-07-2012, 12:07 PM
55. I'm not a student and the answer to this might actually save lives

Does the following argument make statistical sense given the data? – if not how can it be corrected/improved? It is all about the huge number of...

• Replies: 4
• Views: 2,487
07-05-2012, 11:19 PM
56. convergence in probability help

Hey guys, I'm hoping that one of you smarter than me can help me with understanding the concept of convergence in probability. I'm currently using...

• Replies: 9
• Views: 2,723
07-05-2012, 04:09 PM
57. Bayesian vs. Frequentist

Hi, I am a college student who has taken a course in frequentist probility learned a little bit of Bayesian probability. I don't know enough to...

• Replies: 8
• Views: 4,471
07-03-2012, 03:43 PM
58. Limit of binomial supermartingale

Hi! My first post here, so I'm not sure if this is an appropriate forum for my question. Anyway, here it goes. I am faced with the following...

• Replies: 0
• Views: 2,062
07-03-2012, 03:49 AM
59. Computing probability density function

If I know the probability distribution of two variables, say x and y, i.e. I know that P(x) and P(y) are both gaussian, how would I compute the P(R)...

• Replies: 4
• Views: 1,725
07-01-2012, 11:17 PM

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