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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: 30,193
09-30-2005, 09:44 AM
1. ### Probabilities Logical Problem

Hi, i would like to leave you here a logical problem related with probabilities, if you can help me i would appreciate a lot!. The problem: You...

• Replies: 2
• Views: 1,020
02-20-2013, 01:59 PM
2. ### Help With Potential Textbook Error

I'm reading through the statistics chapter in my research methods textbook and think I may have found a mistake. I was hoping someone here could...

• Replies: 5
• Views: 793
BGM
02-20-2013, 11:15 AM
3. ### Here's a good brain puzzler:

If I choose an answer at random, what's the probability of getting it correct? A) 25% B) 0% C) 50% D) 25%

• Replies: 4
• Views: 1,062
02-20-2013, 09:24 AM
4. ### basic question: random variables

Hello all, I just came across this wonderful forum and was pleasantly surprised by the wealth of information and rich discussion here! I am...

• Replies: 4
• Views: 2,031
02-19-2013, 06:34 PM
5. ### regression choice

I made survey for my master tesis. And it is a problem now to choose the method to analyse the model. I can use buying probability after event or...

• Replies: 3
• Views: 1,673
02-19-2013, 04:39 PM
6. ### Transition matrix to compact set of rules?

Hello. Could you please point me to some methods of extracting a compact set of rules that describe a Markov chain, given that chain's (often very...

• Replies: 2
• Views: 1,243
02-17-2013, 07:16 AM
7. ### Study question

Reviewing for an exam I have become stumped, \int_{1}^{x} {3}{t}^{-4}{dt} =1-{x}^{-3} P(x<2|x \geq 1.5) and so on

• Replies: 6
• Views: 1,792
02-15-2013, 03:28 PM
8. ### Moved: Data Entry

• Replies: -
• Views: -
BGM
02-15-2013, 01:22 PM
9. ### Discrete Optimization Question

1. The problem statement 9. This is a simplified inventory problem.Suppose that it costs c dollars to stock an item and that the item sells for s...

• Replies: 5
• Views: 3,247
02-15-2013, 12:48 PM
10. ### Simple conditional probabilities

Hello, I am currently reading an image processing paper that involves conditional probabilities in one section, but my probability classes are way...

• Replies: 1
• Views: 1,743
BGM
02-15-2013, 12:31 AM
11. ### Asynchronis Particle Counting

I have particles incident on a detector at 1000 events/sec. My detector is turning on and off at 1000 e/s bu only for 10% of the time, asynchronis to...

• Replies: 0
• Views: 993
02-14-2013, 05:27 PM
12. ### Confirm my results for me

1. The police confiscated 500 tablets suspected to contain ecstasy. A sample of 15 tablets were sent to the laboratory for analysis. After getting...

• Replies: 1
• Views: 1,607
02-14-2013, 02:45 PM
13. ### quantify difference between discrete distributions

Hello, I am trying to quantify the difference between two discrete distributions. I have been reading online and there seems to be a few...

• Replies: 0
• Views: 1,564
02-14-2013, 09:49 AM
14. ### Problem Understanding Simple Example

I have a simple example that I do not understand. I would really appreciate some help. It's been 30 years since I had a class in probability :) ...

• Replies: 1
• Views: 1,746
BGM
02-14-2013, 05:38 AM
15. ### Double Exponential Density

Hi All, I've got a question on which I'm hoping someone might be able to help! 1. Problem Let T be an exponential random variable with...

• Replies: 1
• Views: 3,462
02-14-2013, 01:11 AM
16. ### Help applying correlation coefficient to calculate paired statistical outcome

Hi there, I was wondering if anyone would be willing to help me, or point me to where I can find the info I seek. I'm doing some probabilistic...

• Replies: 2
• Views: 1,832
02-13-2013, 03:38 PM
17. ### joint probability

is the product of a probability function in x and a probability density distribution in x a function describing joint probability as function of x?

• Replies: 2
• Views: 1,306
02-13-2013, 03:01 AM
18. ### Help create a payoff table!

Would the states of nature and decisions be the same?! Suppose that Willy has to decide on the number of special Valentine boxes to make prior to...

• Replies: 1
• Views: 2,898
02-12-2013, 10:38 AM
19. ### HELP: Creating an ordered list of objects; independent/dependent events

Let us say that I have an ordered list of objects (numbered balls). From this list of N balls, I am going to choose seven of them and place them...

• Replies: 0
• Views: 1,002
02-11-2013, 07:19 PM
20. ### Copula decomposition

Hello, I need to estimate correlations in the conditional distribution p(y|theta,eta) using copula. Theta is a scalar and eta is 3x1 vector. For...

• Replies: 0
• Views: 935
02-11-2013, 04:39 AM
21. ### Student - t CDF

Hello, I need to evaluate multivariate student-t CDF at various points, my software enables to evaluate CDF of student-t with mean zero and...

• Replies: 2
• Views: 1,241
02-11-2013, 04:15 AM
22. ### Decision Trees

I know how to pull back the tree, but I can't figure out how to draw them from a story! Here's the story, please help the best you can: EnvirNova...

• Replies: 1
• Views: 1,195
02-10-2013, 10:23 PM
23. ### High order Markov Chains

Hi, i'm stuck in a task of simulating a binary sample from a Markov chain of high order (say q>100). Does anyone knows an algorithm to do this? ...

• Replies: 0
• Views: 1,391
02-09-2013, 10:04 AM
24. ### two-sample Kolmogorov-Smirnov test

Hello, Hello, I have recorded some discrete data with an unspecified distribution. I have generated some discrete data from a model. I'm...

• Replies: 0
• Views: 788
02-08-2013, 08:54 AM
25. ### Distribution

We have an interval , which we divide into k equally sized subintervals and generate n observations. Lets call the number of observations which falls...

• Replies: 3
• Views: 1,250
02-08-2013, 08:50 AM
26. ### Probability- Expected Value

Every year at this time Willy Wonka makes special heart shaped boxes of candy to sell for Valentine's Day. The probability distribution of sales in...

• Replies: 1
• Views: 1,261
BGM
02-07-2013, 12:26 PM
27. ### Looking at the information

I could stare at this and saunter over it for hours but I still don't know which way to interpret this problem. It is basically the last problem in...

• Replies: 3
• Views: 2,205
BGM
02-07-2013, 05:32 AM
28. ### simple probability question

So i just wrote a test and i answered this question as 50% tell me if i am right supposed 50% of all students in the world read newspaper. 5...

• Replies: 2
• Views: 962
02-06-2013, 07:59 PM
29. ### Calculate a probability

There are 2n ball in the box, n black and n white. Now get 2 from the box(we call it one pair), then get another 2, ... continue until there is no...

• Replies: 2
• Views: 1,155
02-06-2013, 12:58 PM
30. ### Probability Distributions

Hi, I understand all the fuss about normal distribution. a lot of real life events and their probability of occurence follow a normal...

• Replies: 3
• Views: 1,589
02-06-2013, 12:36 PM
31. ### Probability of Drivinf while intoxicated

On New Year's Eve, the probability of a person having a car accident is 0.09. The probability of a person driving wh)le intoxicated is 0.32 and...

• Replies: 2
• Views: 3,679
02-05-2013, 08:32 AM
32. ### p value chi-square vs. randomization test

Hi, I am conducting a meta-analysis, using Random effects model, with a categorical variable, I need help to interpret restuls where for between...

• Replies: 0
• Views: 2,257
02-03-2013, 09:56 PM
33. ### creating conditional probability distribution

I have a system which visits two locations and collects signals every 10 seconds. It is well known that A causes B to occur but not all the time. So,...

• Replies: 0
• Views: 1,992
02-03-2013, 05:19 PM
34. ### Law of Total Expectation

Suppose a box initially contains 1 red marble and 1 black marble and that, at each time n = 1, 2, ..., we randomly select a marble from the box and...

• Replies: 3
• Views: 2,165
02-03-2013, 04:26 PM
35. ### Finding UNcondintional Mean and Variance of U

Good evening! I am working through this problem and searched online and found the solution, which makes a lot of sense, but am not quite sure...

• Replies: 8
• Views: 5,919
02-03-2013, 09:43 AM
36. ### Histogramms and the Central limit theorem

Hi everybody I was wondering the following: If we make histogramms for a large number of samples for any aribitrary distribution (and assume that...

• Replies: 1
• Views: 2,972
BGM
02-03-2013, 06:17 AM
37. ### E[MSE] simple linear regression

Hi All- I am trying to figure out how to prove that MSE = SSE/n-2 is an unbiased estimator of sigma^2 in simple linear regression. I have that...

• Replies: 14
• Views: 41,504
02-02-2013, 03:44 AM
38. ### Probability - Distribution ?

According to experts, each year there is about 18% of all federal taxpayers who would file an incorrect tax return. The Canada Customs & Revenue...

• Replies: 1
• Views: 2,549
02-01-2013, 02:40 AM
39. ### Combinational problem

This homework problem has me stumped. I have a pretty logical result b/c I think I use all of the 5 credits needed. The problem states, A video...

• Replies: 3
• Views: 1,912
02-01-2013, 12:39 AM
40. ### Having trouble with an expected value manipulation

I'm having a little trouble with part a. Okay, okay, I'm having trouble with all of it, but I'm guessing that solving a will help with the rest....

• Replies: 5
• Views: 2,687
01-31-2013, 10:54 PM
41. ### Calculating Probability of Failure

I am a solicitor with an engineering background. I have a client who needs to work out what the probability is that a customer will be injured by a...

• Replies: 6
• Views: 2,914
01-31-2013, 02:32 PM
42. ### I've got a question about Pr(A|B)

So my goal is to find the Pr(AuB) and I thought this may work but the answer is only a little bit to much. I want to first ask something and then try...

• Replies: 2
• Views: 1,615
01-30-2013, 05:55 PM

Someone told me the answer was 1, but I don't know how to show the work. Among those western Nova Scotia applicants for commercial loans at MCB...

• Replies: 1
• Views: 932
01-30-2013, 03:02 PM
44. ### Probability?

There is a 50‐50 chance that the king carries the gene of twins. If he is a carrier, then each princess has a 50‐50 chance of having twins...

• Replies: 1
• Views: 1,549
01-30-2013, 04:49 AM
45. ### Probability?

The final grades given by two professors in introduction to Sociology course have been carefully examined. The students in the first professor’s...

• Replies: 1
• Views: 1,163
01-30-2013, 04:48 AM
46. ### help me!

about 0.025 or 2.5% of the cedar trees in that pasture are shorter than how many feet in height? how could i solve it? help me as soon as...

• Replies: 3
• Views: 1,681
01-30-2013, 02:04 AM
47. ### Probably easy probability question

Hi, I'm an engineer who have just started studying statistics and I have this question I just can't seem to get right. The question at hand is you...

• Replies: 4
• Views: 1,653
01-29-2013, 05:37 PM
48. ### Probabbility?

Simran can either take a course in Math or in Biology, if Simran takes the math course, then she will receive an A grade with probability 1/5. If she...

• Replies: 2
• Views: 1,215
01-29-2013, 03:38 PM
49. ### 4-alternative forced choice problem

Hi there, I have the following problem: Participants in my experiment were presented with 4 objects and 4 categories and asked to map each of...

• Replies: 2
• Views: 2,793
01-29-2013, 12:45 PM
50. ### help!!!

An investor holds two stocks, each of which can rise (R), remain unchanged (U), or decline (D) on any particular day. Assume that for the first...

• Replies: 3
• Views: 4,303
01-29-2013, 05:58 AM
51. ### Is this right?

Can you check if my solution is right for the 2 questions below? 1. An airliner has 2 p.m., 8 p.m., and 10 a.m. ﬂights from Montreal to...

• Replies: 0
• Views: 2,291
01-28-2013, 10:32 PM
52. ### 52 card deck

Ok, I have been trying to solve part d) in my homework for the past hour and then I turned to the web and still couldn't find an answer. This is an...

• Replies: 4
• Views: 2,393
01-27-2013, 11:52 PM
53. ### Probability- Combinations

I need help getting started with this question. We've done combination questions, but not with percents, and its throwing me off. Computer...

• Replies: 2
• Views: 1,169
01-27-2013, 10:17 PM
54. ### Calculating a value given probability and type of random variable

Hello, "Let \overline{X} be the average of a sample of 16 independent normal random variables with mean 0 and variance 1. Determine a, such that...

• Replies: 1
• Views: 1,013
BGM
01-27-2013, 03:31 AM
55. ### Central Limit Theorem Problem

Hey folks, I am working on this problem and found several solutions, but none the same! A business ships its products, variable in weight,...

• Replies: 1
• Views: 1,913
01-26-2013, 12:39 PM
56. ### Combine Normal Distributions

How do you combine multiple normal distributions with different standard deviations and means, to produce one representative normal distribution? ...

• Replies: 12
• Views: 20,710
01-26-2013, 12:51 AM
57. ### Networking probability theory; packet length, time of transmission, etc; need help

Assume that an application sends packets over a communication link with a capacity of C bits per second, i.e. when the packet is l0 bits long, then...

• Replies: 2
• Views: 1,885
BGM
01-25-2013, 11:17 PM
58. ### Conditional probability

Hi guys. I am currently preparing for SOA Exam P and am having some questions. In a survey of 94 students, the following data was obtained. 60...

• Replies: 0
• Views: 1,333
01-25-2013, 01:19 PM
59. ### Probability conundrum

This little problem has got at me so much I've registered on this site just to see if there is a solution! Maybe someone can help This is the...

• Replies: 1
• Views: 1,435
BGM
01-24-2013, 11:47 PM
60. ### Combination question

Hey, kind of stumped on this and hopefully someone can point me in the right direction. A company is looking at events over N years. A person can...

• Replies: 1
• Views: 1,680
BGM
01-24-2013, 01:06 PM

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