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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: 30,373
09-30-2005, 09:44 AM
1. ### A question in probability

i wanna know the difference between P(A∩B) and P(A|B) i don't mean in the law i mean its meaning what i know is P(A∩B) ==> is the probability of A...

• Replies: 1
• Views: 1,624
05-11-2012, 11:39 AM
2. ### A question on exponential distributions

from an exponential distribution with expected value 0.2, if i get the mean of 20 observations, then repeat (get another 20) , etc, so in total 1000...

• Replies: 0
• Views: 2,056
12-01-2010, 07:25 PM
3. ### A question on Poisson distribution

Hi, Let X1 and X2 be Poisson distributed variables with the same mean m and Y be defined as multiplication of X1 and X2 (Y=X1X2). How can i obtain...

• Replies: 2
• Views: 4,177
BGM
06-18-2010, 12:11 PM
4. ### A question on probability

Let X_1, X_2, \ldots, X_{10} be a random sample from N(80, 3^2) distribution. Define S = \sum_{i=1}^{10} U_i T = \sum_{i=1}^{10}\left(...

• Replies: 9
• Views: 2,907
01-30-2011, 11:56 PM
5. ### A question on the Poisson process

Let N be a Poisson process with rate 1, T^{(\lambda )} be an exponential random variable with rate \lambda independent of N, and U^{(\lambda)} be...

• Replies: 3
• Views: 3,206
10-06-2010, 01:34 PM
6. ### a question with 3 different probablities

a baseball problem player A has a batting average of .350, player B as a BA of .184 and player C has a BA of .381. Making no adjustments for the...

• Replies: 3
• Views: 1,761
08-20-2011, 04:21 PM
7. ### a random number generator problem

Hello all, I have to resolve the next type of problem: I have a machine that is supposed to generate truely random 0/1 values. If i'm testing...

• Replies: 1
• Views: 3,410
05-19-2007, 12:07 AM
8. ### A random variable that is a mix of discrete and continuous

Here's a question we got for homework: It is given that at a certain bank there's 50-50 chance that when you enter there's: - no one waiting...

• Replies: 1
• Views: 2,090
BGM
12-17-2011, 10:58 AM
9. ### A random variable's median and variance.

-Part a) A box from 0 to 1 of height 1. What is its median ? Interpretation/Attempt: A random variable, X, is uniform, (So that its density is...

• Replies: 0
• Views: 1,772
02-09-2017, 05:43 AM
10. ### A reversal of the Birthday Problem

I hope today finds you well and in good spirits. I am trying to develop a model based, in part, on the Classic Birthday Problem. Looking at...

• Replies: 0
• Views: 3,451
11-05-2006, 05:29 PM
11. ### A self study question for extreme probability....Gaming-Cards.

No, this does not have to do with any current games on the market.... I have a unique question for anyone that can explain it to me. I'm a bit of a...

• Replies: 3
• Views: 1,722
02-28-2012, 11:54 AM
12. ### a short one

Hi guys, I'm new to this forum, and perhaps there already exist an answer to this question. Anyway here I go, I have an assignment in...

• Replies: 5
• Views: 2,423
02-09-2009, 08:01 PM
13. ### A simple but trickly probability question

My coworker asked me a probability problem. It seems simple, but, maybe not actually. Could anyone help me and take a look at the problem? Your...

• Replies: 2
• Views: 2,177
06-09-2007, 05:01 AM
14. ### A simple expectation problem!

guys, consider we have N numbers (no equal numbers). we want to find the maximum of these numbers. The method is like this... I choose one of...

• Replies: 0
• Views: 2,010
01-02-2007, 05:54 PM
15. ### A simple Probability question....

MALE FEMALE Thrombosis 10 14 Appendix 15 10 Blood-Pressure 25 18 TOTAL 50 42

• Replies: 1
• Views: 2,227
10-21-2007, 09:35 AM
16. ### A simple probability theory question, but the answer may not be simple.

Hi, I have the following question. Suppose I draw a measure of 0<m<1 points uniformly without replacement from . What is the probability that less...

• Replies: 2
• Views: 1,436
BGM
05-11-2014, 11:45 AM
17. ### A simple problem about normal distribution

At supermarkets in a Midwestern city the sales of canned tuna varies from week to week. Marketing researchers have determined that there is a...

• Replies: 2
• Views: 7,482
02-07-2012, 06:01 PM
18. ### A solitaire game with no possible moves?

Hi everyone. I just opened a solitaire game on my computer with no moves possible. Does anyone have any idea what the probability of this happening...

• Replies: 0
• Views: 2,434
09-21-2006, 09:17 PM
19. ### a tricky gaussian problem

hello everyone, I am stuck with a problem I can't figure. I will try to explain briefly what it is: we run an experiment where we expect 4/9 of...

• Replies: 2
• Views: 1,319
10-26-2012, 02:00 PM
20. ### A Tuberculosis Test....

:confused: A Tuberculosis Test is given to a sample of 3 TB patients. The test will detects the diease 95% of the time. Let y denote a positive...

• Replies: 2
• Views: 2,622
12-13-2006, 12:46 PM
21. ### A Two Class Probability Problem

This is a problem that has been bothering me for a while. Say you have 10 'things' and each thing can either be of class A or class B (mutually...

• Replies: 0
• Views: 2,257
03-04-2008, 03:25 PM
22. ### A two-outcome game on a limited budget: the probability of being busted over n tries

Hello, My question does not regard a piece of homework, but I have become stuck trying to solve a statistical problem and I would really...

• Replies: 2
• Views: 2,220
BGM
11-13-2011, 03:37 AM
23. ### A very simple question, I think.

Hi. I have what I think will be an easy question. Apologies if it's too trivial or if this is the wrong forum, I've never done stats, and really only...

• Replies: 3
• Views: 3,205
05-29-2010, 04:04 PM
24. ### 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: 4,128
10-03-2010, 03:26 AM
25. ### About marginal densities... confused

If we have N random variables (not necessarily normal; with some level of correlation) and M observations of them (i.e. we have M N-dimensional...

• Replies: 1
• Views: 2,541
07-13-2007, 09:38 PM

I found there is a term of "negative probability" in WikiPedia. Here is the link: http://en.wikipedia.org/wiki/Negative_probability I would...

• Replies: 1
• Views: 2,279
10-07-2009, 06:49 PM

Can someone give some tips to prove the statement: C and D are two sets. If C belongs to D, then \sigma(C) belongs to \sigma(D). where...

• Replies: 1
• Views: 1,684
05-30-2012, 05:17 AM
28. ### About the definition of probability

We know the measurable space of probability is a continuous space of . Then, if a random measure is valued (or defined) on the continuous space , is...

• Replies: 2
• Views: 2,855
10-29-2009, 03:41 PM
29. ### About the definition of random correspondence

I have a question:"Is there a concepte and a definition on random correspondence in the current Probability Theory?" If there is, how is it...

• Replies: 0
• Views: 2,607
03-08-2010, 11:17 AM
30. ### Absolute risk reduction

• Replies: 0
• Views: 3,160
09-12-2010, 03:38 AM
31. ### Acceptance Testing - Calculating Type 1 and Type 2 Errors

Removed...

• Replies: 1
• Views: 1,568
01-27-2015, 11:25 AM
32. ### Actuarial Exam P

Sorry if this isn't really the best place for this question. I passed the exam P and am just trying to figure out how I can determine how many...

• Replies: 0
• Views: 3,623
01-31-2012, 01:22 PM
33. ### add chi square or F distributions yields?...

Hi there, I have two questions: First: X1 follows X^2 distribution with n1 d.f. X2 follows X^2 distribution with n2 d.f. Then what is...

• Replies: 1
• Views: 3,476
09-29-2008, 06:01 PM

Hello, I have a discrete distribution: with a chance of a delay (in hours) I came out of 80 000 measurements to a table with max 40 h delay and...

• Replies: 2
• Views: 1,044
02-22-2016, 10:09 AM
35. ### Adding normal distribution - z-scores

Hi - I have a quick question. I understand that the sum of two normal distributions is a normal distribution. Now let's say I have the z-score...

• Replies: 5
• Views: 8,662
06-05-2012, 09:21 AM
36. ### Adding squares of dependent random variables

Hi there, I hope someone in this forum can help me with this problem: I am creating a scalar test statistic from a time series of a vector r(t)=...

• Replies: 2
• Views: 2,748
05-26-2009, 01:15 AM
37. ### Adjusted odd ratio interpretation

Hi There, I have a question regarding adjusted ODD RATIO interpretation I am trying to interpret a table of results of logistic regression...

• Replies: 1
• Views: 8,706
06-11-2009, 08:09 AM
38. ### Adjusting Fantasy Sports Projections Using Z-Scores

Hi! Stats newbie here so be nice! :wave: I'm currently working on a projection model for fantasy basketball. I am trying to adjust a player's...

• Replies: 2
• Views: 2,815
02-21-2014, 02:02 PM
39. ### Adjusting ranges of probabilities based on a single variable

Hi everyone, I've been trying to solve this problem for a few weeks now, but can't think of any solutions. I can't think of how to generalize...

• Replies: 2
• Views: 1,612
06-26-2012, 10:43 AM

Hi, I posted a similar thread in the "R" posting but thought I'd may as well post here as it is generic as well. To calculate lotto probability...

• Replies: 3
• Views: 2,786
02-28-2009, 08:21 PM
41. ### Advantage of reducing process variation?

The question is, "What is the advantage of reducing process variation, thereby causing process control limits to be at a greater number of standard...

• Replies: 4
• Views: 8,219
03-08-2012, 02:30 PM
42. ### Advantages of having population-defined parameters?

Hello peeps. Quick “conceptual”/weird question. While finishing-up my next manuscript, I started thinking that a way to “buff it up” would be to talk...

• Replies: 1
• Views: 1,194
04-14-2016, 06:06 PM
43. ### Age and the Vancouver Stanley Cup Riot

Practice Question: The information below is public knowledge just released by the BC justice department which shows some people who were charged...

• Replies: 1
• Views: 2,029
12-02-2011, 11:57 AM
44. ### Algebra with random variables

I've done something strange, potentially bad, and i just wanted to check how bad. So i have the p.d.f of waiting time as: ...

• Replies: 3
• Views: 1,467
09-16-2015, 08:40 AM
45. ### Almost lost 10\$ at the bar

First off, I am kind of drunk, so excuse the simple mistakes. I was just given even odds on a bet on 1 roll of 5 dice. (I didn't take it) Meaning we...

• Replies: 0
• Views: 1,202
05-08-2012, 03:13 AM
46. ### Almost sure convergence

Let Y_n be a simple symmetric random walk on the integers Z, starting in state 0. Define X_n to be 1 if Y_n=0 and 0 otherwise. I have already...

• Replies: 1
• Views: 4,311
11-22-2009, 11:05 AM
47. ### almost sure convergence

Hi, I've got this question I'm trying solve for days already. Let Xn be random variable = 2 with prob 1/3 and = 1/2 with prob 2/3 Let Zn be...

• Replies: 5
• Views: 4,298
BGM
01-13-2012, 04:20 AM
48. ### Alternative to chi-squared test needed

Hi all. I need a goodness of fit test for a situation in which a chi-squared test isn't appropriate - where the sum of the expected values does...

• Replies: 5
• Views: 8,134
04-15-2011, 05:23 PM
49. ### 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: 2,573
07-04-2007, 01:44 AM
50. ### Am I doing this right?

Here is the problem: According to an opinion poll, 905 of 1393 americans polled believe that america is ready for a woman president. If the...

• Replies: 0
• Views: 2,312
03-26-2009, 12:43 PM
51. ### Am I on the right track for this one?

The height of people in a certain population is approx. normally distributed with a mean of 67 inches and a standard deviation of 3.4 inches....

• Replies: 4
• Views: 2,745
02-08-2006, 12:59 AM
52. ### Am I on the right track?

The researcher in Part A decides to compare the difference in the population proportions of supporters for a reduction in funding between taxpayers...

• Replies: 1
• Views: 1,543
01-21-2012, 11:56 PM
53. ### Am I right?

The odds are two to one that when A and B play tennis A wins. Suppose that A and B play two matches. What is the probability that A wins at least...

• Replies: 2
• Views: 4,737
09-01-2006, 06:37 PM
54. ### Am I right?

:confused: Here is the Question. The probablity that one of your new batch of printers will break down has been an unacceptable 0.2 each day. You...

• Replies: 1
• Views: 2,377
11-15-2007, 10:09 PM
55. ### Am I thinking of this the right way?

Hi, I'm not sure if I'm thinking of the right way to do this problem: Bacterial cells are often classified by their shapes, the three most common...

• Replies: 3
• Views: 2,753
09-30-2015, 01:02 PM
56. ### Amateur has a question please

My wife and I have been married for 30 years. During all this time neither my wife, nor her father (my father-in-law), have had an auto accident. We...

• Replies: 5
• Views: 1,937
11-02-2013, 08:54 PM
57. ### An abstract mortality question

A few days ago a 48 year old man died and a 65 year old man did not die. I'm familiar with the mortality tables and the likelihood of, in the US,...

• Replies: 2
• Views: 3,028
08-03-2010, 02:09 PM
58. ### An application of optional sampling theorem to 1-D random walk

Hello all, I have a question about what wiki has to say about an application of optional sampling theorem to symmetric random walk: * Now...

• Replies: 2
• Views: 3,406
07-29-2011, 07:18 PM
59. ### An engineer has observed that the gap times between...

I am struggling with this question ..please help An engineer has observed that the gap times between vehicles passing a certain point on a...

• Replies: 2
• Views: 2,599
12-31-2014, 04:23 PM

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