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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: 30,170
09-30-2005, 09:44 AM
1. ### i need help!

this is my first year taking a stats class and i dont understand this question if someone could explain how to do it to me that would be greatly...

• Replies: 1
• Views: 2,372
09-13-2007, 01:48 AM
2. ### i am having trouble with a stats question

What do you think is the most common nonobstetric (not related to pregnancy) reason for hospitalization among 18-44 American women? According to the...

• Replies: 1
• Views: 2,736
11-28-2010, 10:37 PM
3. ### need help with a few questions

the question is: A shrub that is purchased at a local nursery has probability .80 of surviving the first year. If a customer pruchases 4 shrubs,...

• Replies: 1
• Views: 4,770
07-13-2007, 03:55 AM
4. ### Need help with contingency tables

I'll do all the math in the contingency tables but I got this question and I'm stumped on how I should set the tables up, any advice would help a...

• Replies: 0
• Views: 1,277
10-16-2012, 09:38 PM
5. ### 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: 1,315
03-08-2014, 01:42 AM
6. ### Can't justify 'correct' answer

I thought I understood sampling without replacement fairly well, but this problem has me stumped as the answer that I calculate doesn't appear to be...

• Replies: 2
• Views: 1,334
07-29-2014, 07:29 PM
7. ### Normal Distribution Help :(

Hi i had a problem with a normal distribution question The question is: Find a and b such that P(a<X<b)=0.90 and such that a and b are the same...

• Replies: 1
• Views: 1,927
04-10-2008, 01:01 PM
8. ### probability

I am new to stats and have an assignment due in two days. I can only explain it by writing out the problem. Not sure how to begin solving. The...

• Replies: 0
• Views: 2,051
11-25-2010, 11:30 AM
9. ### Help with basic proportions

The Saloon claims that their pints, on average, are 16 ounces. To test whether the Saloon is actually pouring LESS than 16 ounces (at the .025...

• Replies: 0
• Views: 4,882
10-11-2010, 08:02 PM
10. ### Probability of Yahtzee game

Hi, i am new to this forum. Sorry if i post in wrong place. Have anyone played Yahtzee game? It's a popular game with 5 dice and you can roll up...

• Replies: 3
• Views: 1,910
11-03-2013, 09:59 PM
11. ### probability

what is hypergeometric experiment?

• Replies: 4
• Views: 2,484
09-24-2006, 09:38 AM
12. ### prove inequality

inequality theorem

• Replies: 0
• Views: 3,628
09-23-2006, 05:48 PM
13. ### weibull distribution

How could weibull random variables be generated from a uniform random numbers generator?

• Replies: 1
• Views: 3,322
11-05-2006, 08:40 PM
14. ### how to find joint probability distribution of 3 variables

I am stuck in a problem. we have a red balls, b blue balls and c white balls. We are choosing n balls without replacement. How to find joint...

• Replies: 2
• Views: 9,136
10-27-2006, 09:59 PM
15. ### A coin thrown probability question

Hi all I could not explain this question by using "the product rule for independent events" - A coin is thrown four times. What is the probility...

• Replies: 2
• Views: 1,924
12-27-2011, 11:03 AM
16. ### A probability question

I am trying to revise for a test, and am working through some prep questions. I am struggling on this one, could anyone help? Suppose there is a...

• Replies: 4
• Views: 1,201
08-22-2012, 08:53 PM
17. ### 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: 1,996
12-02-2011, 11:57 AM
18. ### Estimate Probabilites

Hi All, I am interested in replicating in-game win probabilities for the NBA. There are a number of sites on the web that do this; sometimes it...

• Replies: 2
• Views: 2,597
06-15-2010, 07:30 PM
19. ### Probability problem

An experiment consists of flipping one coin four times. Give a pair of events that are independent and a pair of events that that are dependent, and...

• Replies: 0
• Views: 1,248
12-11-2014, 03:12 AM
20. ### 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: 1,305
02-13-2013, 03:01 AM
21. ### Can you figure this out?

My company has a Safety Bingo game. For every day there is no accident in the plant, we pull a number. Every associate has a card and there are 110...

• Replies: 2
• Views: 3,293
08-30-2006, 09:25 AM
22. ### Probability that a hypothesis is correct

I posted this question on Y! Answers a while ago and no one answered it :) I thought I'd try my luck here instead. A scientist performs an...

• Replies: 1
• Views: 2,547
05-03-2010, 03:15 PM
23. ### Conditioning on more than one event

Lately, I've been studying conditional probability. I'm working with the following theorems: 1. P(A|B)=P(A,B)/P(B) (the comma represents...

• Replies: 4
• Views: 1,875
09-07-2016, 09:58 PM
24. ### 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: 1,739
08-20-2011, 04:21 PM
25. ### another baseball question

Player will bat 4 times in this game. He is expected to get a single .15 of the time he goes to bat for 1 total base, he will get a double .05 a...

• Replies: 0
• Views: 1,871
08-22-2011, 04:27 PM
26. ### Video Game Probability Stats

First off, hi! I've never been to this forum, but would like to humbly request help on something a little over my head. 1st problem at hand: ...

• Replies: 0
• Views: 4,244
06-01-2008, 01:55 AM
27. ### Probability - help working out a betting probability scenario

Need a little help and guidance: Tennis match. Player A to hold serve is 85%, Player B to hold serve is 80%. What is the probability that...

• Replies: 0
• Views: 1,295
09-26-2016, 09:33 AM
28. ### hi a problem of probability.

There are 3 bag. there are 5 white and 5 black balls in 1st bag. In the 2nd 4 white and 8 black. in the 3rd8 white n 6 black. A ball is selected...

• Replies: 1
• Views: 2,323
12-22-2005, 09:35 AM
29. ### Conditional expectation question

Hey, I would really appreciate your help with the following question: X and Y each has a uniform distribution on and the two are independent....

• Replies: 8
• Views: 5,391
03-06-2010, 02:46 AM
30. ### NCA Office Pool Win Probability

Hello, I run a small NCAA office pool website where folks make predictions about the outcome of each game in a 64-team tournament that consists of...

• Replies: 0
• Views: 3,007
12-19-2016, 02:12 AM
31. ### Assistance with Monte Carlo Method for Board GAme

Outcomes 16 cards. The cards have up to four values. I need assistance building a data set I can analyze. Simulating a starting hand, and...

• Replies: 5
• Views: 1,861
01-27-2016, 06:58 PM
32. ### Monte Carlo Assistance

Hello, I have a monte carlo simulation built. Need assistance tweaking. Please reach out if interested. Tom

• Replies: 0
• Views: 1,366
02-01-2016, 11:00 PM
33. ### 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: 1,117
11-03-2014, 10:29 PM
34. ### Combining Bernoulli distributions

I'm looking for a way to find the standard deviation of a certain distribution. This distribution is created by performing n_0 Bernoulli trials with...

• Replies: 4
• Views: 1,666
07-18-2012, 03:20 PM
35. ### Probability that one random variable is greater than another

I need to find the probability that a normally-distributed random variable is greater than a uniformly-distributed random variable. That is: X...

• Replies: 2
• Views: 4,032
b_d
07-20-2012, 12:52 PM
36. ### Infinite sum

Hi All- It has been a few years since my last calc class and now I am taking a course in mathematical stats. I have the discrete data pmf:...

• Replies: 4
• Views: 3,079
10-12-2008, 02:06 PM
37. ### Discrete random variable

Here is a problem given : Let X equal the number of flips of a fair coin that are required to observe heads-tails on consecutive flips. Need to...

• Replies: 1
• Views: 4,076
10-23-2008, 10:27 AM
38. ### Exponential pdf

Hello all- Can anyone help on the meaning of the exponential distribution? The derivation I am looking at shows the cdf F(w) = P(W<=w) = 1 -...

• Replies: 1
• Views: 3,173
10-28-2008, 11:29 PM
39. ### Squared Normal Dist

Hello All- My problem is: Find the distribution of W=X^2 when X is N(0,4) I know that this problem is related to the fact that Z^2 =...

• Replies: 2
• Views: 3,227
11-13-2008, 07:40 PM
40. ### 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: 41,473
02-02-2013, 03:44 AM
41. ### Power large Sample Standardized?

This is probably staring me in the face, but my face has been staring at it for many hours ... ;) In basic power analysis of a mean, using the...

• Replies: 1
• Views: 2,209
03-03-2010, 10:11 PM
42. ### Expected number of events in a simple birth-death process.

I have a simple birth-death process with parameters, beta=4/5v and the initial population size is 6. I have calculated that the birth rate= 4/9 and...

• Replies: 0
• Views: 2,235
02-11-2016, 05:38 AM
43. ### Simple probablility question

A closet contains 8 pairs of shoes. If 4 shoes are randomly selected, what is the probability that there will be no complete pair? So i know that...

• Replies: 8
• Views: 7,997
06-08-2010, 05:53 PM
44. ### Counting rules.

Hi, Can someone please explain to me why the answer to this question is as written? Suppose we deal four 13-card bridge hands from an ordinary...

• Replies: 9
• Views: 6,770
09-26-2010, 08:20 PM
45. ### Need some help understanding probability theory.

Hello, My probability course has just started and I have a little trouble in preparation for my first quiz tomorrow, understanding some concepts....

• Replies: 5
• Views: 4,906
09-19-2010, 10:02 PM
46. ### Simple probability question.

Hi, this is a fairly simple problem that is confusing me a bit on some matters. A person watches tv at 6pm 2/3 of the time, and watches tv at 11pm...

• Replies: 1
• Views: 3,178
09-20-2010, 11:55 PM
47. ### Is P(A n B) the same as P(B n A)?

As the topic says. If we have two events A and B respectively, is it possible that P(A n B) != P(B n A)? This isn't a homework question but its...

• Replies: 1
• Views: 12,353
10-05-2010, 03:44 PM
48. ### Cumulative distribution help.

Okay so I've got this question: Let X be a random variable with a cumulative distribution function Fx. Prove that P(x=a) = 0 if and only if Fx is...

• Replies: 11
• Views: 5,969
10-11-2010, 06:25 PM
49. ### What does this mean?

If a question asks us to find (X,Y) or show that (X,Y) ~ something X = something Y = something does that mean it is asking us to find/show the...

• Replies: 1
• Views: 2,242
BGM
11-07-2010, 10:35 PM
50. ### Urgent - how do i find joint density?

If i have 2 individual probability distributions given for 2 different variables. So i have 2 variables x1 and x2. the distribution of x1 is the...

• Replies: 1
• Views: 3,688
11-11-2010, 03:35 AM
51. ### What does this distribution mean?

When it says: the marginal distribution of Y is given by 1/Y ~ Exponential(lamda) does that mean the distribution is written has: ...

• Replies: 4
• Views: 3,136
c2q
11-28-2010, 05:52 PM
52. ### Expected Value question.

Suppose that X, given Y = y, is distributed Gamma(α, y) and that the marginal distribution of Y is given by 1/Y~ Exponential(λ). Determine E(X). ...

• Replies: 2
• Views: 3,403
12-02-2010, 11:13 AM
53. ### Help with understanding this expected value proof

can someone please explain this. My instructor did this but I don't really understand how. I have E(Y*E(YlX)) from theorem of total...

• Replies: 3
• Views: 3,383
BGM
09-26-2011, 04:06 AM
54. ### how to evaluate this expected value?

hi I've been stuck on trying to understand a part of this proof I am reading. I want to know how they got from this step to the next = ...

• Replies: 0
• Views: 2,299
c2q
09-30-2011, 05:06 PM
55. ### Help with a proof

If x1...xk are random variables defined on a set omega, and B1...Bk C R^1, then prove that (x1,....,xk)^-1 (B1x,...,xBk) = x1^-1B1 n x2^-1B2 n ......

• Replies: 2
• Views: 2,306
c2q
02-04-2012, 03:41 PM
56. ### Proving some axioms about sigma algebra.

I have the following to prove: Given a sigma field/sigma algebra B on a set S. Prove: i) 0 E B ii) if B1,..,Bk E B then UBi E B for i = 1 to n...

• Replies: 9
• Views: 7,575
02-05-2012, 10:32 PM
57. ### Proof of covariance of a weak stationary stoch. process.

Hey there. I'm having trouble on how to show this is true. Assuming you have a weakly stationary independent increments stochastic process with ...

• Replies: 15
• Views: 6,745
c2q
02-05-2012, 04:22 PM
58. ### Gaussian process proof.

I want to prove that the brownian bridge is a gaussian process. Before I start I just wanted to make sure of something. In my notes my...

• Replies: 0
• Views: 2,929
c2q
02-05-2012, 04:29 PM

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