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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: 31,047
09-30-2005, 09:44 AM
1. ### Immortality & Bayesian Statistics

- I seem to have written an 8 page paper virtually proving -- through Bayesian statistics -- that we are immortal (or something similar). Obviously,...

• Replies: 81
• Views: 17,689
04-06-2015, 05:11 PM
2. ### Probability Problem

Pls help...........:wave: My problem exercise goes like this - An employee of the records office at a certain school currently has 10 forms on...

• Replies: 74
• Views: 64,397
leo
06-04-2008, 07:00 PM
3. ### Immortality and Conditional Probability

- Hopefully, I won't aggravate readers so much with this approach. - Here, my claim is simply that the likelihood of my current existence is...

• Replies: 71
• Views: 15,614
04-22-2015, 06:50 AM
4. ### Help with Bayesian question please

Just got a question with Bayes problem, I always struggle to understand the actual question in Bayes problems so that could be why I'm stuck, but...

• Replies: 48
• Views: 6,822
07-27-2015, 09:48 AM
5. ### Probability of coincidence ?

Probability of coincidence ? (WARNING... resolving this problem may force upon you world fame and extreme wealth) I basically don't know where to...

• Replies: 40
• Views: 13,476
02-27-2014, 09:21 PM
6. ### Probability System, discrete dist.

here is the system we're dealing with here Component 1 is the key one while an identical backup component is 2 and is in an "off" state until...

• Replies: 28
• Views: 10,182
11-16-2010, 12:10 AM
7. ### I need some help, please

Hi, I have found some difficulty in solving this exercise. HINT: Use the fact that T/σ^2~chi-squared (n-1) and the moments of the chi-squared...

• Replies: 28
• Views: 13,574
11-13-2013, 04:10 PM
8. ### The probability of seeing 13 minutes past the hour at least once every day?

Each day, there are 24 opportunities in a 24 hour period to see 13 minutes past the hour. There are 60 x 24 possible times that can be reported in...

• Replies: 28
• Views: 8,420
11-08-2014, 03:40 PM
9. ### Consequences of choosing the wrong likelihood function...

hey everyone! just a quicky-quick question here. i think i remember reading somewhere that some of the nice properties of parameter estimates...

• Replies: 26
• Views: 7,952
09-23-2012, 12:17 PM
10. ### Joint Density f(X,Y) integration when there is no Y in the eqn

Hi I'm having difficulties with integration by parts when the main function of a joint distribution doesn't contain the Y. Here it is: Let X and Y...

• Replies: 24
• Views: 8,983
BGM
02-14-2011, 04:09 AM
11. ### [SOLVED] Sensitivity/Specificity

Here is my question: The sensitivity of a screening test is 0.95 and it's specificity is 0.85. The rate of the disease for which the test is used...

• Replies: 24
• Views: 7,891
01-29-2012, 11:08 PM
12. ### mann whitney test or Kolmogorov smirnov test?

I'm working with non parametric methods to compare two samples and detect diferences between them. I used the mann-whitney test and obtained, for all...

• Replies: 23
• Views: 27,926
05-09-2010, 02:28 PM

Robert is a

• Replies: 23
• Views: 5,802
11-06-2008, 06:03 PM
14. ### What is the difference between classical and bayesian understanding of probability?

I am reading a book on monte carlo analysis and the author stresses in passing that the definition of probability used in an example in the book is...

• Replies: 22
• Views: 4,328
02-08-2017, 10:28 PM
15. ### Keno or LOTTO style

So, here is how the game goes. suppose that the game uses the numbers 1 through 50 and suppose that the operator selects eight of these. If the...

• Replies: 21
• Views: 11,057
cet
09-27-2006, 04:41 PM

Hi im having trouble with this question. If anyone could help me out thatd be great , Im not sure where to start! Heres info: The cost of...

• Replies: 21
• Views: 6,991
03-30-2008, 10:38 PM
17. ### Joint PDF problem

Hey folks, I've got a problem with a joint probability density function question. Given f(x, y) = 6(x^2)y for 0 <= x <= y, x + y <= 2 and 0...

• Replies: 21
• Views: 14,414
10-13-2010, 05:20 PM
18. ### need help understanding interview question

Hello folks, I had a weird question which I am confused about. I was wondering if you anyone could help me or point me in the right direction (ie....

• Replies: 21
• Views: 4,850
BGM
06-24-2013, 12:41 PM
19. ### Discrete Random Variable

Hey all, I have a Discrete Random Variable taking on values x= 1,3,3^2,3^3,...3^m and f(x)=P(X=x)=c/x for some constant c, find value of c. How...

• Replies: 21
• Views: 3,909
11-27-2013, 09:12 AM
20. ### simulating correlated, non-normal data: WHY DOES THIS HAPPEN!?

i have been experimenting with different methods to generate correlated, non-normal data for comprehensive-exam purposes and i'm finding something i...

• Replies: 21
• Views: 4,760
09-21-2014, 08:59 PM
21. ### comparing two Poissonians

What is the proper statistical test for the following: I know A1 and A2 to be Poisson distributed with (unknown) means x1 and x2. I have a single...

• Replies: 20
• Views: 6,254
06-23-2010, 12:36 PM
22. ### Maximum of a set of independent normal random variables

Consider a set of random variables X_1, X_2, X_3, \ldots, X_n with unit varience but different means: \mu_1, \mu_2, \mu_3, \ldots, \mu_n . What...

• Replies: 20
• Views: 21,353
07-12-2010, 03:45 PM
23. ### Moment Generating Function of a Chi-Squared distribution

Hey guys, need help with this question. Random Variables V and U are independent with N~(0,4). Let W = U^2 + V^2 . Calculate P(W>24). Is the...

• Replies: 20
• Views: 8,033
05-09-2012, 01:54 AM
24. ### The sign of COV( f(x,y) , g(x,y) )

I am a PhD student in Economics, I am reading a paper on statistics, and the author states the following proposition without proof. My question is is...

• Replies: 19
• Views: 9,802
11-02-2008, 03:56 PM
25. ### Settle an Argument

A social club has a daily contest where they draw a name from a list of all of the club members. A name is drawn each day. In order to win, you must...

• Replies: 19
• Views: 5,823
07-27-2010, 07:22 PM
26. ### Unbiased Estimator Question

Suppose that Y has a Poisson distribution with parameter lambda. How can I show that (-2)^lambda is an unbiased estimator of e^(-3*lambda)?

• Replies: 19
• Views: 7,912
01-26-2012, 11:32 AM
27. ### random question about non-Guassian multivariate distributions...

today in my seminar we were talking about all these interesting ways people can start with random uniform distributions and through doing and...

• Replies: 19
• Views: 4,757
03-09-2012, 07:55 PM
28. ### 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: 6,976
09-21-2010, 04:41 PM
29. ### Probability on a Multiple Choice exam

Hello, I am not very good at this type of stuff. I thought up something and I was wondering if someone can look over it and tell me if my...

• Replies: 18
• Views: 23,937
12-25-2011, 07:07 AM
30. ### Time scaling a geometric random variable

Hello, When one performs bernoulli trials at discrete times t = 1, 2, 3, ....., with the probability of a success at an arbitrary trial given by...

• Replies: 18
• Views: 4,221
09-01-2013, 03:44 PM
31. ### Layperson with a question

Hello! A friend of mine recently asked me for help with this, and while we kicked around a few ideas, we weren't really satisfied. That, and the fact...

• Replies: 18
• Views: 4,569
08-06-2015, 09:10 PM
32. ### Not Statistically Significant.... or is it?

I am comparing 2 groups to see if there are differences in GPA across 4 years of high school. Group A has a higher mean for all 4 years, BUT... the...

• Replies: 18
• Views: 1,216
09-02-2017, 10:52 AM
33. ### probability

This is a part of a problem. I decided to ask it here after hours of trying to solve it... Two tennis players make a match composed of 5 sets....

• Replies: 17
• Views: 7,935
11-30-2005, 04:49 PM
34. ### Joint density function

This is from Exercise 5.26 from Mathematical Statistics with Applications v6. f (y1, y2) = {2, 0 <= y1 <= 1, 0 <= y2 <= 1, 0 <= y1 + y2 <= 1 ...

• Replies: 17
• Views: 7,853
04-22-2008, 05:15 PM
35. ### probability question

Hello, I am having trouble with my stat homework. Maybe someone can give me some guidance? I would really appreciate it! A woman is fishing for...

• Replies: 17
• Views: 7,962
10-28-2008, 04:23 PM
36. ### probability homework

Hello, I am having difficulty figuring out my homework. I made attempts and could someone check my answers and see if I'm right or make suggestions?...

• Replies: 17
• Views: 7,008
10-28-2008, 04:41 PM
37. ### Difficult Integral standard normal pdf/cdf

I would like to get an explicit analytical form for the integral (below)...or something close to it with an associated (small) error term. (Note that...

• Replies: 17
• Views: 14,539
BGM
05-31-2010, 09:35 AM
38. ### Generate Random Correlated Variable

I have established a correlation between independent X and dependent Y. Is there a formula for generating a random Y from a particular X? For...

• Replies: 17
• Views: 15,776
06-29-2012, 09:43 AM
39. ### [SOLVED] Correlation between two normal variables ...

Suppose A ~ N (0,a), B ~ N (0,b-a), C = A + B what is the expression for the correlation between A and C?

• Replies: 17
• Views: 7,163
02-04-2012, 11:48 AM
40. ### Thinking Fast and Slow - Probability question

In his book (Thinking Fast and Slow) Kahneman states: For example, if you believe that 3% of graduate students are enrolled in computer science (the...

• Replies: 17
• Views: 8,805
02-08-2012, 04:30 PM
41. ### I have a real stumper here

I have a question that has stumped everyone I have asked. I wonder if anyone can help. Here is the scenario. Every time that team A plays on...

• Replies: 17
• Views: 4,241
03-30-2012, 11:47 PM
42. ### Probability with sampling question

i have been having problems with what should be a trivial probability problem Suppose there are 130 patients. Each patient was administered one of...

• Replies: 17
• Views: 4,981
08-06-2012, 12:18 AM
43. ### Card draw and joint probability

I wonder if I'm overthinking this and want confirmation... I'm in thought about how to apply (1) to find the probability of 2 not independent...

• Replies: 17
• Views: 5,698
08-12-2013, 03:34 PM
44. ### Probability question

I recently stumbled up on this question. Need help in solving this. N balls thrown at N baskets, what is the chance that a random basket will have...

• Replies: 17
• Views: 3,584
05-02-2016, 06:58 AM
45. ### probability

a pharmaceutical firm claims that a certain medication is 92% effective in relieving arthric pain. if ten people who suffer from arthritis are...

• Replies: 16
• Views: 6,160
09-21-2006, 08:28 AM
46. ### simple coin flip problem

hi, I recently discovered this forum and I think this could help me with my stats courses... I havent received the text book yet, so my first...

• Replies: 16
• Views: 11,689
10-23-2006, 09:09 AM
47. ### Probability Simulation Software Recommendation

I am looking for software recommendations that will allow me to define a known multi-level game for the purposes of running simulations to determine...

• Replies: 16
• Views: 9,272
08-19-2010, 10:59 AM
48. ### Probability of radar detection

Aircraft is in certain area, radar correctly registers its presence with prob. of 0.95. If it is not present, radar falsely registers its presence...

• Replies: 16
• Views: 12,141
10-11-2010, 02:39 PM
49. ### show that the sum of e(i) = 0 and the sum of e(i)*Yhat(i) = 0

Consider a usual multiple linear regression model: Y = X β + ε where Y is a (n x 1) response vector, X is a (n x p) matrix with its first column...

• Replies: 16
• Views: 15,165
BGM
11-14-2011, 02:40 AM

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