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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: 30,331
09-30-2005, 09:44 AM
1. ### finding p-value from chi square freedom

For example, estimated p-value from chi-square table with 1 d.f is 0.1 < p < 0.9. Can anyone tell me how we get this range? aka. can anyone help me...

• Replies: 1
• Views: 9,039
02-23-2010, 02:42 AM
2. ### Cup and ball game: what are the odds of that?

OK we are having an intelectual discussion (no, really) about the change in odds during the classic cup and ball game. To explain: a dealer has...

• Replies: 2
• Views: 12,605
02-22-2010, 08:00 PM
3. ### More issues with probability distribution

Now I have to construct a probability distribution table from the following information: There are six pencils for sale and two are defective. If...

• Replies: 2
• Views: 3,112
02-22-2010, 03:19 PM
4. ### Probability Distribution question

Homework question involving number of defects found in a randomly selected factory item. if X is the number of defects found, and the probability...

• Replies: 1
• Views: 4,067
02-22-2010, 01:32 PM
5. ### probability, joint density

Hi - I'm stuck on a step in the following example taken from a textbook (survival analysis by Klein): I'm familiar with evaluating...

• Replies: 2
• Views: 2,792
02-21-2010, 05:24 PM
6. ### Joint Density Function Question

So (fy1,fy2) = e^-(y1 + y2) ) , for y1>0, y2>0 and 0 elsewhere. What is P(Y1 + Y2 < 3) The answer is .8009 I just can't work out how to get...

• Replies: 4
• Views: 7,443
02-21-2010, 08:52 AM
7. ### This is kind of embarrassing

QUESTION What is the probability TODAY that over the next ten years that "EVENT X" will occur based on the following criteria. *There is a 50%...

• Replies: 3
• Views: 2,418
02-21-2010, 12:05 AM
8. ### probability question independence

Hi there, Everything is positive: Let the r.v. T=min(X,C), and the r.v. Y. Let also D=1, if X<C, 0 otherwise. (X,C,Y,T continuous). I.e. the...

• Replies: 1
• Views: 2,480
02-20-2010, 11:56 AM
9. ### distribution of the range of N independent standard normal variables

Let x1, x2, ... xn be independent standard normal variables. (standard normal: normal with 0 mean and variance 1). Let the range R be defined as...

• Replies: 4
• Views: 7,445
02-20-2010, 01:07 AM
10. ### Considerations in taking on a one-time gamble

Assuming I'm risk-neutral, how are they different from taking on repeated gambles?

• Replies: 0
• Views: 2,958
02-18-2010, 04:10 PM
11. ### Odds of birthday on same day

I'm confused about the following... Two people have their birthday on a specific day of the year. Are the odds 1:365 or 1:730 ? :confused: ...

• Replies: 7
• Views: 12,508
02-18-2010, 04:09 PM
12. ### Random Samples

I cannot figure out how we come to the answer of 3,921,225 for this question. Out of a 100 numbers I need to take a random sample of four numbers. ...

• Replies: 1
• Views: 3,830
BGM
02-18-2010, 02:02 PM
13. ### Poisson tricky problem

Suppose that N individuals have a certain gain "a" at t0 and that each of them at any point in time participate to an independent lottery which...

• Replies: 0
• Views: 2,644
02-18-2010, 01:14 PM
14. ### Gamma Probability (really an area of a circle question)

The question reads: Explosive Devices used in mining operations produce nearly circular craters when detonated. The radii of these craters are...

• Replies: 1
• Views: 7,472
BGM
02-18-2010, 09:20 AM
15. ### Poisson distribution question

hi guys, I seem to forgot how it's done, a little help will be appreciated ! the number of accidents in a factory have the Poisson distribution...

• Replies: 2
• Views: 3,546
02-17-2010, 04:04 PM
16. ### Ratio of uniforms is Cauchy

Hi all! I have U is uniform(0,1) and V is uniform(-1,1) such that U^2 + V^2 <= 1. Furthermore, let X=V/U. Show that X is Cauchy. I tried to...

• Replies: 4
• Views: 4,298
02-17-2010, 02:21 PM
17. ### Quick question on marginal distributions

Hi, I'm trying to figure out a marginal distribution for a joint probability function. My question is - what do I use as my limits of integration? ...

• Replies: 2
• Views: 2,946
02-16-2010, 08:58 PM
18. ### how many times would you expect to see a sequence "the" in a text

If every letter in an English text would have equal probability to occur, and if every combination of letters would be equally likely, how many times...

• Replies: 1
• Views: 2,815
02-16-2010, 05:27 AM
19. ### Simulated Annealing (Cooling Too Fast)

How do you prove something cools "too fast"? Here is the full question: For simulated annealing, some temperature schedules decrease...

• Replies: 0
• Views: 3,305
02-16-2010, 02:26 AM
20. ### prob question

There are 9 people in group A, 4 people in group B and 2 people in group C. 6 of them will win a ticket. 1. what is the probability that all the...

• Replies: 1
• Views: 2,341
02-15-2010, 01:29 PM
21. ### Benford's Law and U.S. States

Can Benford's law apply to the population of the 50 U.S. states? Is the sample size adequate to make this work? If so, what does it show? Curious...

• Replies: 1
• Views: 2,955
02-13-2010, 12:00 AM
22. ### Odds question

A newspaper article preceeding the 1994 World Cup semifinal match between Italy and Bulgaria stated that "Itality is favored 10-11 to beat Bulgaria,...

• Replies: 2
• Views: 4,387
02-12-2010, 06:05 PM
23. ### Fairly Easy Question - Poisson Distribution

My first post! Anyway I just need a bit of help with a question that I've come across in a textbook which is as follows: Cars arrive at a toll...

• Replies: 5
• Views: 7,456
02-11-2010, 10:48 PM
24. ### Markov Chains & Flux

Hi, I have a question about Markov Chains: Consider a partition of the state space S of a Markov chain into two complementary subsets A and Ac....

• Replies: 1
• Views: 2,833
02-11-2010, 07:36 PM
25. ### Poker probability question

This is probably a simple enough problem, however its been 10 years since I was in a statistics class, so I am clueless. Any help is appreciated. ...

• Replies: 1
• Views: 2,256
02-11-2010, 12:20 AM
26. ### Question about probability - roulette wheel

Hi there, Have a question about the topic above. I spin a roulette wheel and wait until 31 of the 37 numbers have come up. I then cover the...

• Replies: 6
• Views: 5,200
02-09-2010, 01:23 PM
27. ### Forgot how to calculate!

1. CNAE, an all-news AM radio station, ﬁnds that the distribution of the lengths of time listeners are tuned to the station follows normal...

• Replies: 0
• Views: 1,946
02-08-2010, 07:52 PM
28. ### Transformation of univariate random variables

Hi all, I need help with two problems: Problem1: Let U and V be iid Uniform(-1,1). Furthermore, let W=U^2 + V^2 and Z = U / sqrt(W). What is...

• Replies: 3
• Views: 6,375
02-08-2010, 08:42 AM
29. ### Random walk and Central limit theorem

(Random Walk) A stock has the value of 100 on day 0. Each day, the value changes randomly either one unit upwards with probability 2/3 or two units...

• Replies: 2
• Views: 4,076
02-08-2010, 06:30 AM
30. ### Method of Moments, MLEs, and Standard Errors

Hi, I have a question about standard errors in the context of this problem. Any help would be greatly appreciated: Suppose X is a discrete random...

• Replies: 13
• Views: 14,034
BGM
02-07-2010, 04:13 PM
31. ### Bayes Problem

A diagnostic test is designed to detect whether subjects have a certain disease. A positive test outcome predicts that a subject has the disease....

• Replies: 2
• Views: 3,865
02-06-2010, 11:08 AM
32. ### Facebook Probability Question

This seems like a straightforward problem, but I can’t seem to wrap my head around it. Maybe tomorrow after a little more sleep! In short, I’m...

• Replies: 0
• Views: 2,198
02-05-2010, 04:54 PM
33. ### probability problem

can anyone help me with this problem? a boy finds that he can climb to a height of at least 1.85m once in five attempts, and to a height of at...

• Replies: 8
• Views: 3,256
02-03-2010, 09:54 PM
34. ### Probability of an Event

There is probably a very simple answer to this, but please help a stats novice. I am trying to determine the probability of an event occurring in...

• Replies: 12
• Views: 9,329
02-03-2010, 09:00 PM
35. ### Probability, binominal distribution

A hotel manager knows that approximately 5 % of the reservations are so called “no-shows” – people who have made a reservation, but do not arrive...

• Replies: 6
• Views: 8,031
02-03-2010, 03:22 AM
36. ### Expected value and Standard deviation of 2 alternatives

Hi! I'm glad I found this great forum! I really hope to be of use myself and help answer some easier questions. In the meantime, could somebody...

• Replies: 1
• Views: 9,528
02-02-2010, 06:22 PM
37. ### Exploratory Factor Analysis

Hi All: I'm doing an EFA study. Here are the specifics: - A battery of 9 questionnaires - Using iterated principal axis factoring as my...

• Replies: 0
• Views: 2,911
02-01-2010, 07:06 PM
38. ### Probablilty binomial distribution

Keeping in mind that this is an excerpt from a novel, let us examine the probability, 0.7980, of a successful jump. If you were one of the l2-member...

• Replies: 7
• Views: 4,063
02-01-2010, 03:40 PM
39. ### Normal R.V. (z) multiplied by a function of z

it is found in one of the papers I've read recently and written: z ~ N(m,v) and f(z) is just any function of z then E(exp(z)*f(z)) =...

• Replies: 6
• Views: 3,340
02-01-2010, 06:09 AM
40. ### Probablilty binomial distribution

Keeping in mind that this is an excerpt from a novel, let us examine the probability, 0.7980, of a successful jump. If you were one of the l2-member...

• Replies: 1
• Views: 2,858
02-01-2010, 01:20 AM
41. ### Correlating time series data between sources

I have data from a remote environmental station, collected hourly over a period of months. Extreme outliers indicated periodic bad data and so the...

• Replies: 1
• Views: 2,855
01-31-2010, 09:37 PM
42. ### Probability distribution of independent variable

Hello people, i m stuck at this question:(:(: Two players A and B are playing in the final of a table-tennis tournament in which the player who...

• Replies: 1
• Views: 2,854
BGM
01-30-2010, 09:09 AM
43. ### Number in a group having birthday coincidence probability<0.5

Hello, Considering 365 days in a year and uniform distribution of birthdays throughout the year, I want to find out the number of people (among N)...

• Replies: 2
• Views: 3,884
01-30-2010, 12:07 AM
44. ### cluster

Hi there, Suppose I have some variables (among others of several types) measured in likert scale and need to cluster my data according to these...

• Replies: 1
• Views: 2,925
01-29-2010, 10:17 PM
45. ### probability problem

Let, X is a random variable with MGF = exp{ 3t + 8t^2}. then P ( -4.84 < X < 9.6) = ? (A) equal to 0.700 (B) equal to 0.925 (C) equal to 0.975...

• Replies: 7
• Views: 3,219
01-27-2010, 07:51 PM
46. ### best forecast

hi, i have been solving this question and my result is different than the results i have been given to compare to. can u please tell me if i am...

• Replies: 1
• Views: 3,238
BGM
01-27-2010, 08:53 AM
47. ### Probability of a Sample Mean between two numbers

I am having troubles with a problem that requires me to find the probability of a sample mean between two numbers. I am given the mean and the SD,...

• Replies: 0
• Views: 8,989
01-25-2010, 09:46 PM
48. ### Can't reconcile probability information

Hello there! I'm doing a review course in probability that I thought would be trivial. By and large, I'm not having any difficulty, but one...

• Replies: 2
• Views: 2,413
01-25-2010, 02:41 PM
49. ### forecast and fine

hi, am i solving it right? a coin is flipped twice with probability of 2/3 for heads. you are supposed to forecast the number of heads with fine...

• Replies: 1
• Views: 2,832
01-24-2010, 02:07 PM
50. ### even and odd probability of coin

hi, i am preparing for an exam and i wondered if some one could show me explicitly how to calculate the probability of getting an even number of...

• Replies: 1
• Views: 5,322
BGM
01-24-2010, 08:02 AM
51. ### correlation coefficient

hi another exam preparation question: let x1..xn be random varibale independent and with same dist. they have exp. u and variance v. let m be a...

• Replies: 2
• Views: 5,340
01-24-2010, 07:49 AM
52. ### variable dependency check

hi, i am a bit confused. i know how to check if two variables are not correlated. but how do i check they are independent? for instance i have...

• Replies: 0
• Views: 2,437
01-24-2010, 04:32 AM
53. ### problem with convergance of probability

hi, this is a simple on but some how i get a result different from what the professor got. i guess i am wrong but i dont know why. i need to find...

• Replies: 3
• Views: 2,807
01-24-2010, 04:19 AM
54. ### Help

Pregnant women are screened for brith defect for Down syndrome. probability of baby has down syndrome are listed AGE Probability of down...

• Replies: 0
• Views: 2,073
01-21-2010, 06:02 PM
55. ### How do you multiply a probability times a probability?

Just a non-math guy needing help from some math guys so I can finish an article for a magazine! I know it's easy to do, I just don't know how. ...

• Replies: 10
• Views: 5,347
01-20-2010, 01:05 PM
56. ### Symmetric distribution

Hi everyone! I am trying to understand the solution of a problem. "It says that x has a symmetric distribution, so that E=0, where mu=E". Now,...

• Replies: 2
• Views: 5,103
01-19-2010, 09:33 PM
57. ### probability of failure in a multi-component system

I want to calculate the failure rate of a system that has multiple independent points of failure. If any one of these intermediate points fail then...

• Replies: 2
• Views: 16,642
01-19-2010, 10:09 AM

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