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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: 31,138
09-30-2005, 09:44 AM
1. ### Continuity correction, poisson

Hi There is something that puzzles me. I tried calculating a Poisson probability. Exactly, and with the normal distribution, using both the...

• Replies: 3
• Views: 2,994
03-09-2014, 11:27 AM
2. ### Mmsee

If I am given a random vector X with mean ' and a covariance matrix C= how do I find the MMSEE of x1 given x2 = 0 x3 = 0 x4 = 0

• Replies: 4
• Views: 2,868
03-08-2014, 01:51 AM
3. ### Binomial formula - solve for N help ...

Hi, I'm not a student and this is not for a test. I'm a programmer and this is related to the markets. This is a link for the common formula:...

• Replies: 1
• Views: 1,452
03-08-2014, 01:42 AM
4. ### Poisson Distribution

On average, every six minutes a car passes by a sector in which it plans to build a tunnel. The passage of many vehicles indicate risk of congestion...

• Replies: 1
• Views: 2,486
BGM
03-06-2014, 10:50 PM
5. ### Homework Help! Axioms of Probability

Hi, so I've been stuck on three problems after multiple submissions and still cannot get it right! Can someone help and mind explaining? The bolded...

• Replies: 0
• Views: 3,469
03-05-2014, 08:05 PM
6. ### Need help with this problem

On average, every six minutes a car passes by a sector in which it plans to build a tunnel. The passage of many vehicles indicate risk of congestion...

• Replies: 2
• Views: 2,828
03-05-2014, 07:24 PM
7. ### Apparent contradiction with the definition of probability

Hi everyone, here is my doubt: according to the definition of probability the probability that in a coin tossing the result be heads is 0.5 because...

• Replies: 1
• Views: 1,755
03-05-2014, 05:58 PM
8. ### calculating expected cell frequency multivariate normal distribution

How would I go about calculating the expected cell frequency of a discrete distribution (say, multivariate normal)? The 1-D analog would be the...

• Replies: 3
• Views: 1,079
BGM
03-05-2014, 07:48 AM
9. ### Care to place a bet? (probability guru needed)

I consider myself pretty good when it comes to math and probabilities, but this has me stumped. It's your lucky day! A man offers you a fair coin...

• Replies: 1
• Views: 2,293
BGM
03-04-2014, 10:14 PM
10. ### Probablity

The probability that in a fair a person will hit the balloon is 0.25. What is the probability that a person will hit 2 balloons using binomial...

• Replies: 1
• Views: 1,432
03-03-2014, 11:42 PM
11. ### Multivariate normal distribution, not full rank, probability density function

If X has a multivariate distribution of full rank and Y is the sum of the elements of X. Then (X,Y) is a multivariate normal distribution but not...

• Replies: 1
• Views: 1,769
BGM
03-03-2014, 12:06 PM
12. ### Probability question

I need a probability question answering as soon as possible and i though this might be the place to come. There are 13 balls in a hat being...

• Replies: 5
• Views: 2,041
03-02-2014, 11:36 PM
13. ### Deriving the sampling (or asymptotic) distribution

Assume we have the following function: f(p) = \frac{1}{(1-p)d}\ln\left(\frac{1}{T}\sum_{t=1}^{T}\left^{1-p} \right) where d is a constant ...

• Replies: 3
• Views: 3,000
03-02-2014, 01:18 AM
14. ### Events following Poisson Distribution including a fixed dead time

Hi, Im trying to describe some events with the Poisson distribution and overall its a really good fit. There is however a slight error in the...

• Replies: 1
• Views: 2,194
03-01-2014, 10:08 PM
15. ### Multiple Criteria, non-binary outcomes

So, I'm trying to predict outcomes using baseball data. What I want to do is predict the outcome of batted balls based on the following criteria: ...

• Replies: 2
• Views: 1,186
02-28-2014, 11:47 AM
16. ### 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: 13,593
02-27-2014, 09:21 PM
17. ### Probability question - Cards

Hello everyone! I just started to study statistics by myself because I spent a semester abroad and there are no more lectures at the University, if...

• Replies: 0
• Views: 1,511
02-26-2014, 05:17 AM
18. ### Same flat tire

Hello, I am unsure about how to solve this one: It's Friday afternoon and six fraternity brothers at UNC have just attended their last class of the...

• Replies: 7
• Views: 4,773
02-26-2014, 12:24 AM
19. ### Probability of selecting two different colored balls

Given an urn with x red balls, and y green balls, thoroughly mixed, what is the probability of choosing two colors in the first two picks, when the...

• Replies: 12
• Views: 3,187
BGM
02-25-2014, 10:20 PM
20. ### probability & time series

hi I'm a physician and really need help from somebody who is good at probability. I calculated time series of tidal stresses. It turned out that...

• Replies: 1
• Views: 1,749
02-25-2014, 02:59 PM
21. ### Need help- formulating difference equation

there is a square with 4 equal blocks. if a mosquito set to fly starting at block 1, it is equally likely to fly to other blocks 2,3,4. what is the...

• Replies: 0
• Views: 1,120
02-24-2014, 08:00 PM
22. ### Weiner Hopf method cross-correlation confusion

u(n) = .4s(n) +.7s(n-1)-.1s(n-1) +v(n) where variance of v(n) = .003 I want to find the cross correlation matrix against the optimal delay of 6...

• Replies: 0
• Views: 1,175
02-24-2014, 12:07 AM
23. ### New at this

If I offer a 90% satisfaction rate. and 3 people call me what is the probabilty that they will satisfied?

• Replies: 1
• Views: 1,125
02-23-2014, 08:56 PM
24. ### Basic correlation matrix question

I am new to statistics. I have a signal u(n) = .4s(n)+.7s(n-1)-.1s(n-2) +v(n) where v(n) has variance .003 E yields .4^2 +.7^2 +(-.1)^2...

• Replies: 1
• Views: 1,087
02-23-2014, 08:45 PM
25. ### Stats

The time to failure for a TV is modeled by this equation f(t) = 0.02e -0.02t. Should I start this problem off by looking at the T table getting the...

• Replies: 4
• Views: 1,714
02-23-2014, 04:32 PM
26. ### Sufficent statistics and unbiased

If I find the (unique) sufficient statistic of a parameter and say I also found the MLE of the parameter. If the MLE of the parameter is not...

• Replies: 2
• Views: 1,399
02-23-2014, 08:58 AM
27. ### Independence versus conditional indenpendce

Independence versus conditional independence. Consider x and y independent Gaussian random variables with zero mean and unity variance. 1. For an...

• Replies: 2
• Views: 1,581
02-22-2014, 11:59 AM
28. ### 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: 3,026
02-21-2014, 02:02 PM
29. ### Some questions

1. Suppose you are calculating an Analysis of Variance for a completely randomized design. You are testing the hypotheses: H0: µ1 = µ2 = µ3 = µ H1:...

• Replies: 0
• Views: 1,271
02-18-2014, 01:21 PM
30. ### Poisson probability question

1. An enemy force is known to be hiding in one of twenty possible locations. General Staff orders a search to be made by picking a site at random,...

• Replies: 1
• Views: 1,717
02-17-2014, 07:08 PM
31. ### Help with an algorithm

Say I have many conditions (C1...n), and one event E. I know the basic probability of both E and C1..n occurring. I'm not too good with this stuff......

• Replies: 0
• Views: 1,256
02-14-2014, 02:01 PM
32. ### Probability

this is my question Suppose 20% of the items produced by a factory are defective. Suppose 12 items are chosen at random. Find the probability that...

• Replies: 1
• Views: 1,252
BGM
02-14-2014, 12:20 PM
33. ### Binomial Distribution - Help

• Replies: 2
• Views: 988
02-14-2014, 01:10 AM
34. ### Binomial Probability (Elementary Statistics)

Hi, I was hoping someone could explain this to me. I've tried online tutoring, and honestly it doesn't seem like they know what their doing. My...

• Replies: 0
• Views: 1,129
02-13-2014, 11:10 PM
35. ### Need Help with Model

I need help with the following... I am using @Risk and am trying to set up a model. I finished an MBA level stats course, and am fairly familiar...

• Replies: 3
• Views: 1,637
02-12-2014, 09:23 AM
36. ### statistic help me please "probability"

1. Data on the 30 largest stock and balanced funds provided one-year and five year percentage returns for the period ending ending March 31, 2000...

• Replies: 0
• Views: 2,411
02-11-2014, 10:59 AM
37. ### Post Conditional Probability question???? Help me ,please

1. Data on the 30 largest stock and balanced funds provided one-year and five year percentage returns for the period ending ending March 31, 2000...

• Replies: 1
• Views: 3,119
02-11-2014, 07:29 AM
38. ### Conditional Probability question???? Help me ,please

1. Data on the 30 largest stock and balanced funds provided one-year and five year percentage returns for the period ending ending March 31, 2000...

• Replies: 0
• Views: 1,819
02-11-2014, 02:21 AM
39. ### Homework Question

P(high-quality oil)= .50 P(medium-quality oil) = .20 P(no oil) = .30 a) what is the probability of finding oil? I know the answer to this, it is...

• Replies: 1
• Views: 3,018
02-10-2014, 12:35 PM
40. ### Gambling odds probability

2. A gambler offers you to pay even odds if you get 9, 10 or 11 heads in 20 tosses. Should you take the bet? Assume it is a fair coin. X=number of...

• Replies: 1
• Views: 1,718
02-09-2014, 10:46 PM
41. ### Generateing a random variable

Hi, I have a problem on how to start the following problem: Suppose that X and Y are discrete random variables with a joint probability mass...

• Replies: 1
• Views: 1,392
02-09-2014, 10:46 AM
42. ### Application of the unconscious statistician

A random variable Y is normal with mean u and variance s^2. Given that g(y) =exp(2y) , using a taylor series expansion around u to approximate E and...

• Replies: 1
• Views: 1,976
02-08-2014, 10:18 PM
43. ### Binomial Distribution

A company starts a fund of M dollars from which it pays \$1000 to each employee who achieves high performance during the year. The probability of...

• Replies: 3
• Views: 6,031
02-08-2014, 02:10 PM
44. ### random vectors covariance

If a random vector X = ^T where T is the transpose has mean u and covariance R. Find the average and covariance of Y = b1x1+b2x2+...+bnxn where bi...

• Replies: 2
• Views: 1,090
02-07-2014, 12:54 PM
45. ### Monty Hall Probability Question- with what i have done so far

In a game show, there are 3 doors. Behind one of the doors is a car, behind the other two are goats. A contestant chooses door number 1, but...

• Replies: 1
• Views: 1,112
02-06-2014, 04:07 PM
46. ### (Simple) proof for the arithmetic mean?

Hello. I am having trouble trying to figure out a way to answer this homework exercise: "Prove that the arithmetic mean cannot be greater than the...

• Replies: 5
• Views: 2,283
02-05-2014, 03:48 PM
47. ### Comparison of variability of synthetic and real data

Hello, I'm trying to compare a real dataset with a random (synthetic) distribution to determine whether a pattern I see in the data is real or the...

• Replies: 0
• Views: 1,339
02-05-2014, 03:36 PM
48. ### Probability in Hidden Markov Model

Hello, I'm considering a Hidden Markov Model as follows: X_{n + 1} = F_n(X_n,\Theta,\eta_n) (that's X_{n+1} here, I don't know why the + is...

• Replies: 0
• Views: 1,250
02-05-2014, 08:24 AM
49. ### Probability question with percentages

- You are given a number of transmission switches that are unreliable in the following sense: when triggered by a sudden voltage pulse, they will...

• Replies: 2
• Views: 1,736
02-03-2014, 06:09 PM
50. ### Payoff table probabilities

Hello guys, I have an assignment and I am royally stuck and don't have a clue how to begin. Any sort of help would be greatly appreciated (no need to...

• Replies: 0
• Views: 2,581
01-31-2014, 09:09 PM
51. ### Binomial Probability

I am trying to figure out how many possible combinations there are for a 10 question survey that has yes or no answers. I tried writing out a sample...

• Replies: 1
• Views: 1,247
01-30-2014, 10:46 AM
52. ### Question about the basic limit theorem of Markov-chains.

Hi, I have two questions about the theorem. 1. If a Markov-chain is irreducible, aperiodic and and positive recurrent we can use the theorem to...

• Replies: 0
• Views: 2,354
01-26-2014, 09:39 PM
53. ### Closed form formula for the non central moments of normal distribution?

What is the formula for the nth non-central moments of the normal distribution.

• Replies: 1
• Views: 4,462
01-25-2014, 08:50 PM
54. ### Probability for Denver and Seattle reaching the Super Bowl

There are 16 teams in the American Football Conference, the Denver, Colorado Broncos being one. There are 16 teams in the National Football...

• Replies: 3
• Views: 3,137
01-25-2014, 05:03 AM
55. ### proof on expected value inequality

Suppose f(x) symmetric. Prove E^2 <= variance(x) = E-E^2. Attempt: E^2 +E^2 <= E^2 +E^2 = 2E^2 (?) <= E I do not know how to show...

• Replies: 1
• Views: 2,257
BGM
01-24-2014, 04:55 AM
56. ### Probability GIVEN I already know some event has occurred

I ask 14 people to buy something, 2 say yes, 12 say no. Given this happened, what is the probability that the next person I ask will buy...

• Replies: 8
• Views: 1,966
01-23-2014, 02:23 AM

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