1. 10-14-2010
Views:
18,446
Page 1 of 80 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 51 ... Last
Threads 1 to 60 of 4796

# 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: 11,528
09-30-2005, 10:44 AM
1. ### When does the Normal Distribution arise?

Hello guys, Studying the multivariate normal distribution (and the univariate one as well), I found in Muirhead (1982) that the normal distribution...

• Replies: 1
• Views: 90
Yesterday, 05:19 PM
2. ### Distribution

Hello, I having doubts on this issue 1) If X~Gamma(a,B) and Y~Beta(γ,B-γ), respectively with B>= 0 and γ>= 0, such that γ <= B. Which...

• Replies: 10
• Views: 253
BGM
11-22-2014, 04:56 PM
3. ### Hard probability question/game-binomial dist.

Consider 50 people and series of 10 rooms. Each room has, for example, 5 doors that will open to the next room with known (totally known, including...

• Replies: 0
• Views: 78
11-22-2014, 09:58 AM
4. ### Combination and Permutation question

Hi guys, I'm new to the field of probability and statistics, I have a question that I can't seem to be able to solve, it would be a great help if you...

• Replies: 2
• Views: 197
11-20-2014, 11:03 PM
5. ### Expected Value and Variance

If a number X is chosen at random from the integers 1, 2, . . . , 100, what is the expected value and the variance of X? Expected value is just...

• Replies: 3
• Views: 170
11-15-2014, 07:12 PM
6. ### Stats help

A biology student wishes to assess the amount of calories in a certain brand of chocolate energy bars. A sample of bars is taken and the calories...

• Replies: 1
• Views: 224
11-14-2014, 05:32 PM
7. ### Maximum likelihood estimation of transition probabilities

Hi, I'm new to Markov chains but have been advised by a colleague to use this approach for my latest study. I have a basic understanding of the...

• Replies: 0
• Views: 101
11-13-2014, 04:27 AM
8. ### Probability - Law of multiplication?

I'm reading about probability and encountered this problem: http://imgur.com/6xTM9Z1 (I guess the answer of a is 1-0,37=0,63 which is the...

• Replies: 0
• Views: 134
11-12-2014, 10:07 AM
9. ### "Show that fY|X(y) is a density function of a true probability distribution"

Where do I begin?? The course I'm taking is focusing heavily on proofs like this, and I'm studying it at a distance so my opportunity to ask...

• Replies: 3
• Views: 173
BGM
11-12-2014, 05:37 AM
10. ### Probability Help

Hello! Taking an introductory course on statistics in college. Confused about one question. It reads: The IRS reports that 15% of the tax returns...

• Replies: 1
• Views: 128
11-12-2014, 02:10 AM
11. ### Triple Coupon Collector's Problem

I've been looking around for solutions to a certain variation of the Coupon Collector's Problem, but I haven't been able to find anything (and I'm...

• Replies: 1
• Views: 127
BGM
11-11-2014, 03:29 AM
12. ### Problem:Finding n-stickers

Hello, we ( students ) were given a very randomly homework. I say randomly because we've been solving PROBABILITY tasks and now suddenly we were...

• Replies: 7
• Views: 211
BGM
11-10-2014, 01:08 PM
13. ### I am not sure how to solve for a probability when N is not given (beginner help).

I am having the most trouble with part "a)" but I am comparing the two answers so if you feel inclined to discuss part "b)" as well, I would...

• Replies: 6
• Views: 179
11-10-2014, 12:31 PM
14. ### Conditional Variance

Hi, I have difficulty understanding the definition of conditional variance as: var(X|Y) = E)**2 | Y]. Given the definition of variance of a...

• Replies: 6
• Views: 207
11-10-2014, 01:10 AM
15. ### Cumulative Distribution

Can anyone explain how to do this problem: Let X be a random variable uniformly distributed in the interval (0, 1). Find the cumulative distribution...

• Replies: 2
• Views: 150
11-09-2014, 06:25 PM
16. ### Poisson Distribution

I figured out that this is Poisson distribution with a parameter λ >0 P(X = k) = ((λ^k)/k!)e^−λ , k = 0, 1, . . . , And now I want to show that...

• Replies: 3
• Views: 174
11-09-2014, 05:42 PM
17. ### Independent Variables and Distribution

I am having a lot of trouble starting this problem. Can anyone explain the process in doing this problem. Thank you for any help in advance. ...

• Replies: 1
• Views: 170
11-09-2014, 09:24 AM
18. ### 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: 960
11-08-2014, 03:40 PM
19. ### Beginning and end of rainy season. How to?

Hi all, This is a beginner's question, I apologize for that. I have taken Descriptive Statistics and I am on my why to Probability and later...

• Replies: 2
• Views: 157
11-08-2014, 12:54 PM
20. ### How to calculate if a mean is above chance level

Dear all, I have a problem to compare means from two groups with chance level. The Variable I want to compare against chance level is calculated...

• Replies: 2
• Views: 147
11-07-2014, 09:03 AM
21. ### Bayes' Priors

With a Bayes factor, when specifying priors found in previous studies, I know to use 0 as the mean p(population value given theory) when using a half...

• Replies: 0
• Views: 137
11-06-2014, 04:59 AM

Can ANYONE please help me solve this problem, especially part D? (Or let me know I'm going in the right direction??). The tutors at my school are...

• Replies: 1
• Views: 206
11-04-2014, 11:11 PM

I'm having a tough time with my online stat course. Very limited feedback from instructor and I feel somewhat on my own. Can someone assist with...

• Replies: 1
• Views: 160
11-04-2014, 12:56 PM
24. ### finding Confidence interval without CLT

Hi all, I searched the posts and I did not get what I wanted. so here is the question: In our Hw we are given daily sales of pastries and coffee...

• Replies: 1
• Views: 151
11-04-2014, 11:40 AM
25. ### Backpropagated Probabilities

To All: First, I am not sure if backproagation is the right way to define what I am looking at, but it appears to at least take the smallest...

• Replies: 2
• Views: 159
11-03-2014, 10:29 PM
26. ### law of total probability - variation formal names?

Hello, there are different variations of the law of total probability. For example, the probability of 3 discreet events all occurring is: A1 *...

• Replies: 1
• Views: 228
11-01-2014, 06:53 PM
27. ### How to find mean and variation from information given?

I am very lost, my teacher gives us a bunch of notes that make absolutely no sense to me. This is the question im stuck on: -- 41% of adults have...

• Replies: 4
• Views: 189
10-30-2014, 04:33 PM
28. ### Probability of survey item-responses when participants could choose multiple items

Hi there, I am trying to reanalyze some data from published research. My question is: how do you compare 2 proportions of responses, drawn...

• Replies: 0
• Views: 161
10-30-2014, 03:53 PM
29. ### Implications of Joint Independence

Hi, I have a question regarding the implications of joint independence. There are 3 random variables U,V and Z. (U,V) have a bivariate normal...

• Replies: 1
• Views: 148
BGM
10-30-2014, 01:07 PM
30. ### Combinatorics / Conditional Independence problems

Every year, 6 Irish families, represented by 4 members each, meet up and rent 3 minivans of 8 seats each to go to a big festival. In order to mix...

• Replies: 0
• Views: 261
10-30-2014, 03:14 AM
31. ### Normalized histograms show the same mean. Is this correct?

I have to compare the features of histograms. All the histogram are normalized and with same number of bins. This results in the same mean value for...

• Replies: 1
• Views: 143
10-29-2014, 11:35 PM
32. ### conditional independence

hello, I would like to ask the following: I have 3 random variables X , Y and Z. If I know that X is independent of Y given Z then does this...

• Replies: 3
• Views: 177
10-29-2014, 03:57 PM
33. ### An event and its complement

My wife was overdue clearing customs so I thought the probability of her showing up any minute was increasing. But then I thought, suppose -there...

• Replies: 6
• Views: 314
10-28-2014, 04:22 PM
34. ### bizarre distributions

Perhaps some expert here can shine some light on the strange results I've been experiencing lately. I wanted to explore the idea of creating a...

• Replies: 0
• Views: 166
10-28-2014, 09:59 AM
35. ### The Probabiliy of Making it

I have 1,2,3,4,5,6,7,8,9,10,11,12 teams. Only 8/12 teams make it to the playoffs. What is the probability that 3,4,5,8,9,10 are part of the 8 teams...

• Replies: 3
• Views: 285
BGM
10-23-2014, 02:36 AM
36. ### Black Swans, non-normal distributions

I am looking for a reference to a popular science magazine article. The point of it was that in the real world we find populations that are...

• Replies: 2
• Views: 292
10-22-2014, 09:11 PM
37. ### Stats homework help NYS

New York Stock Exchange. Suppose that the percentage returns for a given year for all Stocks listed on the New York Stock Exchange follows a...

• Replies: 0
• Views: 212
10-22-2014, 03:20 PM
38. ### 600 hotdogs. homework help

Not quite sure how to do B or C. Thanks for the help! Jake runs the concession stand for a Chicago area minor league baseball team. He knows that...

• Replies: 0
• Views: 218
10-21-2014, 09:56 PM
39. ### Committee Combination

Hi. I have used the below formulation of the problem. Kindly let me know whether I am correct or wrong. Q. "A condominium management committee...

• Replies: 0
• Views: 146
10-21-2014, 04:20 PM
40. ### Probability of Absolute Return

Mean = 0.04% SD = 1.9% of a percentage rate of return recorded daily for one year on an asset. What is the probability of an absolute return on any...

• Replies: 0
• Views: 161
10-21-2014, 06:36 AM
41. ### Why this Frequency Polygon is not correct?

Hi guys! I stumbled upon this blurry question from one of my lab old exams, in statistics elective course. I will leave you to check the...

• Replies: 0
• Views: 139
10-21-2014, 03:40 AM
42. ### Finding Minimum Probability

Hi. Below is the question in my homework. I don't know whether I've to solve this using Bayes' theorem or I have to provide a general answer. ...

• Replies: 0
• Views: 164
10-20-2014, 03:11 PM
43. ### Bayes Probability question

Question: Yearly automobile inspections are required for residents of the state of Pennsylvania. Suppose that 18% of all inspected cars in...

• Replies: 0
• Views: 171
10-19-2014, 05:57 AM
44. ### Closing Difference between two numbers with confidence limits.

Company A tested its widgets and found that when they tested 10000 of them, 2010 of them failed. They tested the widgets of their competition but...

• Replies: 0
• Views: 225
10-17-2014, 03:26 PM

kindly help (or provide hints) on below question: Suppose that you pay $1024 to enter a coin tossing game. A biased coin with head probability... • Replies: 5 • Views: 423 BGM 10-16-2014, 01:48 AM 46. ### Convergence in Probability Hello all. I have a two statements. One says -\frac{1}{T} \sum_{t=1}^T X_t \rightarrow a in probability as T \rightarrow \infty The... • Replies: 2 • Views: 286 10-13-2014, 05:10 PM 47. ### Simple Bernoulli question I am sort of baffled by this. The point is to simulate how often students will be right when guessing on a multiple choice tests with 5 responses. It... • Replies: 13 • Views: 444 10-13-2014, 04:24 PM 48. ### Drwaing the probability distribution of the population from a sample Hey there, this might be a bit of an uneducated question, but I want to make sure I don't get anything wrong. I'm wondering if one can draw... • Replies: 1 • Views: 252 BGM 10-13-2014, 02:08 PM 49. ### Please help me start this question. Consider an experiment where we roll a single die once and let X represent the number of dots that appear on the top face of the die. Suppose that... • Replies: 8 • Views: 643 10-12-2014, 12:19 PM 50. ### Simple but quite confusing Problem Hi all, I'm solving the problems in probability but, the question below looks simple but quite confusing to me. Regarding question 2-(c), any... • Replies: 1 • Views: 214 BGM 10-12-2014, 11:49 AM 51. ### Negative Binomial Distribution Hi, Regards • Replies: 0 • Views: 200 10-12-2014, 09:54 AM 52. ### Probability theory: The Quantum Measurement Problem There is a famous double-slit experiment in Quantum Mechanics that attempted to measure whether electrons and photons are comprised of particles or... • Replies: 2 • Views: 271 10-10-2014, 09:29 AM 53. ### probability question Five cards are dealt at random and without replacement from a standard deck of 52 cards. What is the probability that the hand contains all 4 aces if... • Replies: 0 • Views: 195 10-09-2014, 03:09 PM 54. ### Difference of expectations of RV's given arbtrary pdfs I've been beating my head on this for a while... Let X and Y have pdf's f & g respectively such that \begin{cases} f(x) >= g(x) & \mbox{if } x... • Replies: 1 • Views: 223 BGM 10-09-2014, 05:23 AM 55. ### Probability that X restaurants will be visited if Y people choose independently I am trying to determine for Y people selecting from X restaurants (with an equal probability) what the expected value of the number of restaurants... • Replies: 2 • Views: 189 JPC 10-08-2014, 08:37 AM 56. ### Prob: Normal probability distribution The mean cost of domestic airfares in the United States rose to an all-time high of$385 per ticket (Bureau of Transportation Statistics website,...

• Replies: 1
• Views: 934
10-07-2014, 08:39 PM
57. ### two normal distributions

the post no longer relevant - outdated

• Replies: 0
• Views: 241
10-06-2014, 07:17 PM

Page 1 of 80 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 51 ... Last

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.