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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: 30,322
09-30-2005, 09:44 AM
1. ### PLZZZZZ HELP!!!!Asymptotic approximation for ppisson distribution

RV X is a Poisson variable.find asymptotic aproximation for this distribution. >>>first i got the charactersitic function im wondering if i...

• Replies: 1
• Views: 2,014
10-04-2010, 10:19 AM
2. ### Binomial MLE

Hello, I need some clarification on the following problem. Suppose Y ~ Bin (189, 59/189) Graphically show the likelihood function and...

• Replies: 1
• Views: 4,511
10-04-2010, 02:25 AM
3. ### About convergence of a monotonic sequence

If {X_n} is a monotonically increasing sequence, such that X_1 <= X_2 <= X_3 <= ... and there's some subsequence of {X_nk} of {X_n} such that ...

• Replies: 0
• Views: 4,119
10-03-2010, 03:26 AM
4. ### Excel's ERF(x) function

I want to provide a formula in terms of Excel's ERF(x) function that calculates the G(x) function. >>>I know that erf(x)=G(x)-1/2 by...

• Replies: 0
• Views: 3,446
10-02-2010, 01:50 PM
5. ### Psychic question

Hi there. Heres a question in my book: A psychic is shown 20 people and told that 10 are criminals and 10 are innocent. The psychic's task...

• Replies: 1
• Views: 1,897
10-01-2010, 03:44 PM
6. ### Gaussian random number generator

Hi guys, I'm quite stuck with how this random number generator works. I know that the random numbers it generates follow the normal distribution....

• Replies: 1
• Views: 4,058
10-01-2010, 01:44 PM
7. ### Help with probability..asap plz

An entomologist is studying the effect of a chemical sex attractant (pheromone) on insects. Several insects are released at a site equidistant from...

• Replies: 5
• Views: 6,543
10-01-2010, 05:30 AM
8. ### The famous cereal box prizes puzzle

One version says that a cereal company puts four different prizes one in each of all their boxes. The prizes are evenly distributed. How many...

• Replies: 0
• Views: 4,452
10-01-2010, 02:33 AM
9. ### proofs are tricky

Hi everyone! Proofs have always been a major weak point for me and I'm really struggling with the problem below. Any help or pointers to get me...

• Replies: 4
• Views: 2,877
10-01-2010, 12:09 AM
10. ### How to prove the epected value of the following?

PROVE THAT E{e^tX}=e^tmiu SUM(n=0,infinity) miu(n) t^n /n! where miu is the mean and miu(n)=E{(x-miu)^n} are the central moments >>>should i...

• Replies: 2
• Views: 4,432
BGM
09-30-2010, 02:01 PM
11. ### How to use DeMoivre-laplace theorem here????

Use the results of the Demoivre-Laplace theroem to solve the following: An unfair coin (p{h}=p=0.6) is tossed n=20 times; find the probability that...

• Replies: 0
• Views: 3,094
09-30-2010, 12:39 PM
12. ### Children Gender Split Probability Question

Hello everyone, I've another question on probability (: A randomly chosen family has 4 children. Assume that the chance of having a son or a...

• Replies: 1
• Views: 4,183
09-30-2010, 10:02 AM
13. ### Poker Card Probability Question

Good evening everyone, I have the following question: Jane plays a game where she randomly draws a card from a pile of 3 poker cards initially...

• Replies: 6
• Views: 3,197
09-30-2010, 10:01 AM
14. ### Integrations by part - Expected Value

Hi guys, I need to prove that E = int - int Any starting points ? Thank you!

• Replies: 1
• Views: 2,831
BGM
09-30-2010, 05:00 AM
15. ### how many seating arrangements are possible

Delegates from 8 countries (G8): U.S., U.K., France, Germany, Italy, Russia, Japan and Canada are to be seated around a circular table. How many...

• Replies: 2
• Views: 5,762
09-29-2010, 08:20 PM
16. ### Probability help needed

Each state of the 50 in the US has two senators. What is the probability that in a random committee of 50 senators (a) Maryland is represented (b)...

• Replies: 1
• Views: 4,541
09-28-2010, 11:39 PM
17. ### Normal Distribution

The time for symptoms of fire blight to develop in apple seedlings maintained at a temperature of 25C is normally distributed with a mean of 7 days...

• Replies: 1
• Views: 3,115
09-28-2010, 11:36 PM
18. ### Gaussian Probability - can I do this?

Hi :) I have a question regarding Gaussian distributions. I actually am not sure where to post this, but after reading thru a few threads, it might...

• Replies: 4
• Views: 3,463
09-28-2010, 10:49 PM
19. ### statistical procedures

What do I gather out of this based on the chi square at the end? Some 54% of subjects in the control group and 44% of subjects in the...

• Replies: 3
• Views: 2,599
09-28-2010, 09:11 PM
20. ### PLZZZZ Help!! a priori probability and posteriori PDF

Flipping a coin game.The coin is unkown,thus, the probability to have heads is unknown:P(H)=P{h}=p.Thus probability to have heads is a random...

• Replies: 4
• Views: 3,092
09-28-2010, 05:05 PM
21. ### Normal Distribution problem

Question: an instructor is administering a final examination. She tells her class that she will give an A grade to the 10% of the students who earn...

• Replies: 4
• Views: 2,782
09-28-2010, 11:36 AM
22. ### Duplication Probability Question

I have a list of 8 items. The list is duplicated so there are two of each item. If I were to then randomize the list of 16 items, and select the...

• Replies: 3
• Views: 2,366
09-28-2010, 11:03 AM
23. ### Convergence of random variables

Hi guys, I have two questions that I don't really know how to approach. 1. Consider a random variable Zn = max (1<= k <= n) Xk where Xk is...

• Replies: 1
• Views: 1,985
BGM
09-28-2010, 10:36 AM
24. ### Gamma Distribution parameters

Hi, I'm trying to understand the theory behind the probability distributions specifically what do the shape and scale parameters for gamma...

• Replies: 4
• Views: 7,534
BGM
09-28-2010, 01:14 AM
25. ### probability and random processes with applications to signal processing Henry Stark

Hi, I need this e book Probability and Random Processes with Applications to Signal Processing (3rd Edition) Henry Stark, John W. Woods. Has...

• Replies: 0
• Views: 5,239
mkl
09-27-2010, 02:52 PM
26. ### Probability of outcome that hasn't been previously recorded.

Hello, If I have three binary random variables: A B and C, and the following set of test results, how can I guess the value of x? A B C 1 0...

• Replies: 0
• Views: 1,942
09-27-2010, 01:09 PM
27. ### Help with a probability problem

There were three parts to the following problem I solved with no problem but part D I can't figure out for the life of me. Can anybody offer any...

• Replies: 2
• Views: 6,573
BGM
09-27-2010, 12:16 PM
28. ### Doesn't "At least" mean greater than

Thank you for taking the time to read my question :) I was given a question that reads: We would like to test whether the percentage of students...

• Replies: 7
• Views: 36,609
09-27-2010, 10:35 AM
29. ### Probability Density Function and Cumulative Distribution Function

Hi everybody, If anyone has experience working with probability density functions (pdf), please look these sample problems over and if you could,...

• Replies: 5
• Views: 13,398
09-27-2010, 06:34 AM
30. ### What is "countability" mean exactly.

Hi, If a question said, S is uncountable, does that mean it is infinite? my professor said that: a set is countable if it can be put into a one...

• Replies: 2
• Views: 3,979
09-27-2010, 01:05 AM
31. ### What is the professor asking for?

I am having difficulty understanding what it is the problem is asking for here. Asked the professor and did not get a lot of help. Please help! ...

• Replies: 3
• Views: 2,908
09-26-2010, 08:57 PM
32. ### Counting rules.

Hi, Can someone please explain to me why the answer to this question is as written? Suppose we deal four 13-card bridge hands from an ordinary...

• Replies: 9
• Views: 6,803
09-26-2010, 08:20 PM

Hi everyone, I am a very new member here so I do not know my way around the forum. I've been searching for the option where I can post a question...

• Replies: 2
• Views: 3,230
09-26-2010, 03:38 PM
34. ### probability question

If the distribution of the standardized value of risk, associated with smoking with cancer, follow a Z distribution, then compute the probability of...

• Replies: 1
• Views: 2,519
BGM
09-26-2010, 11:40 AM
35. ### question involving standard cauchy distribution

nvm solved it. - X1, X2, X3, ... are independent random variables with a standard Cauchy distribution. Prove or disprove the following. ...

• Replies: 1
• Views: 4,529
09-25-2010, 07:24 PM
36. ### Integrating a probability out

I really do not know & understand about integrating out a probability, in fact I really do not understand the phrase integrate something out. The...

• Replies: 2
• Views: 11,735
09-25-2010, 01:47 PM
37. ### How to solve composite function of random variable?

X is a Cauchy random variable (fX(x)=1/pi(x^2 + 1)). Determine fY(y) if Y=g(X) and g(x) is: x-1 x>1/2 ...

• Replies: 1
• Views: 7,152
BGM
09-25-2010, 03:59 AM
38. ### Confidence Interval

Hi all, I am new to this forum and wanted help in calculating Confidence interval (CI) I have 3 possible outcomes with probability of say p1, p2,...

• Replies: 1
• Views: 2,943
BGM
09-24-2010, 03:13 PM
39. ### Project ideas for probability n stats

I needed ideas to prepare a project which has application of probability or stats in some form. The project contains a significant programming part...

• Replies: 0
• Views: 5,918
09-23-2010, 12:04 PM
40. ### simple probability question

Dear all, I am in need of an advice regarding a conditional probability... Although it is very simple, I haven't found anywhere anything similar...

• Replies: 1
• Views: 2,980
09-23-2010, 07:32 AM
41. ### Here we go again.

Based on the history and physical examination, your patient has a 0.3 probability of having a leg thrombosis (blood clot) in the large veins of his...

• Replies: 0
• Views: 1,612
09-23-2010, 04:34 AM
42. ### help on probability question!

I can't seem to figure out how to go about solving this question: Workers for the health clinic measured the cholesterol of 1000 people selected...

• Replies: 4
• Views: 2,039
09-23-2010, 01:21 AM
43. ### Bayesian kills me

I have been practicing this Bayesian thing as you can tell.. so here I have made another attempt to get my concepts clear, If the pre-test...

• Replies: 11
• Views: 3,887
09-23-2010, 12:54 AM
44. ### Probability Distribution

The time (in hours) it takes before belts X and Y need replacing in a high use machine follows the joint probability distribution: integral y/100*...

• Replies: 8
• Views: 4,085
BGM
09-22-2010, 01:01 PM
45. ### how to solve this???

An exam starts at t=0 & is supposed to be over at t=3.The students are asked to "wrap it up" at t=2.5.The relative number of students finishing an...

• Replies: 4
• Views: 2,667
09-22-2010, 02:39 AM
46. ### Probability practise

An electrical system is set up such that power can get from the source to the switch if both parts A and B are working, if part C is working or if...

• Replies: 18
• Views: 6,718
09-21-2010, 04:41 PM
47. ### How to modify this function to be a probability density function????

f(t)=t^2 (1-t)^2 (u(t)-u(t-1)), where u(t) is the unit step function. SHOULD I INTEGRATE f(t) where i get F(T) AND THEN DIFFERENTIATE F(T) TO GET...

• Replies: 4
• Views: 7,045
09-21-2010, 04:25 PM
48. ### Genetics Probability Question

There is a genetic completely recessive trait. Neither mother or father display the trait but they may be heterozygous carriers. The...

• Replies: 1
• Views: 4,095
09-21-2010, 04:17 PM
49. ### Inverse Gamma alternative parameterization?

Hi all, I am trying to generate RVs from an Inverse Gamma(nu,s) in order to replicate some Bayesian estimations. The parameterization given in...

• Replies: 2
• Views: 3,504
09-21-2010, 09:01 AM
50. ### false positive

A company has developed a new drug screening test which correctly identifies cocaine users 97% of the time; marijuana users 88% of the time and other...

• Replies: 3
• Views: 6,492
09-21-2010, 03:53 AM
51. ### What is meant by mod

X(i,j)=k mod 4, Where (i,j=1,...6) & k=i+j Everything is clear, but what is meant by mod 4 here?

• Replies: 2
• Views: 4,398
09-21-2010, 02:27 AM
52. ### Simple probability question.

Hi, this is a fairly simple problem that is confusing me a bit on some matters. A person watches tv at 6pm 2/3 of the time, and watches tv at 11pm...

• Replies: 1
• Views: 3,213
09-20-2010, 11:55 PM
53. ### Transformation of random variables

Suppose X ~ N(0,1). Let Y = exp(x). Find the pdf of Y. P(Y < y) = P(exp(x) < y) = P(x < log(y)) = intergral from ln(y) to 0 for the standard...

• Replies: 1
• Views: 2,904
09-20-2010, 06:56 PM
54. ### counting rule?

20 students have to be split into 5 different labs groups; how many ways can we partition them if the first 3 labs have 3 students, the 4th has 5...

• Replies: 15
• Views: 6,176
09-20-2010, 10:52 AM
55. ### wikipedia entry

I was reading about false positive and found this wikipedia entry, can this be true? how come probability is greater than 1?

• Replies: 4
• Views: 3,005
09-20-2010, 08:42 AM
56. ### Pdf

I'm asked to modify this function into a PDF(probability density function): f(t)=t^2(1-t)^2(u(t)-u(t-1)) Should I differentiate this function?

• Replies: 3
• Views: 2,524
09-20-2010, 03:04 AM
57. ### Need some help understanding probability theory.

Hello, My probability course has just started and I have a little trouble in preparation for my first quiz tomorrow, understanding some concepts....

• Replies: 5
• Views: 4,929
09-19-2010, 10:02 PM
58. ### Random-walk models

Recently read about an example of the random-walk in an old Astrophysics book I picked up when they were cleaning out the college library. Anyone...

• Replies: 0
• Views: 2,538
09-19-2010, 08:36 PM
59. ### Rv

An exam starts at t=0 & is supposed to be over at t=3.The students are asked to "wrap it up" at t=2.5.The relative number of students finishing an...

• Replies: 1
• Views: 1,956
09-19-2010, 03:39 PM
60. ### Easy normal dist

A heating/cooling company advertises that any customer buying an air conditioner during the first 16 days of December will receive a 25% discount if...

• Replies: 3
• Views: 3,271
09-19-2010, 11:47 AM

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