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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: 30,373
09-30-2005, 09:44 AM
1. ### Probability on 2 random events combined

event A and B are not related but : if A happens then the event C has a probability W of happening. if B happens then the event C has a probability...

• Replies: 2
• Views: 2,138
05-19-2012, 05:12 AM
2. ### expectation and integral

Hi maybe a stupid question: Let X be a random variable depending on a parameter \xi . Further let f : \mathbb{R} \rightarrow \mathbb{R} be a...

• Replies: 4
• Views: 2,312
05-18-2012, 02:05 PM
3. ### probability of dying first

Hi I thought about this question when i was at this concert the other day. There were a lot of old people in the concert....people in their 80's.......

• Replies: 1
• Views: 1,607
05-17-2012, 07:15 PM
4. ### modelling departure time probability on consecutive days with copula function

Hello, I have data of the departure and arrival time of cars from their home. These stochastic variables are modelled using a normal copula...

• Replies: 0
• Views: 1,546
05-17-2012, 11:46 AM
5. ### Backwards probability: estimate an original content from a sample

Hello, Here is my problem. In a container are between 10power5 to 10power9 unique elements, each of them could be present several times...

• Replies: 0
• Views: 1,586
05-15-2012, 11:25 AM
6. ### Need help with E(Z) and limit theorems

1) Let Xk be a sequence of independent random variables uniformly distributed on . Let Yk = max(X2k-1,X2k). Let Zn = (Y1+...+Yn)/n. Calculate...

• Replies: 2
• Views: 1,687
05-14-2012, 04:55 AM

Hi, I'm having trouble with a homework problem and I was wondering if someone could walk me through it a bit. Alex and Yan agree to meet at the...

• Replies: 1
• Views: 1,405
05-14-2012, 12:19 AM
8. ### set question from Goldberg's book

I am working my way through Goldberg's Probability: An Introduction and am stuck on problem 4.13, chapter 2. The problem states: "Let E and F be any...

• Replies: 2
• Views: 1,701
05-13-2012, 08:50 PM
9. ### Subtract two Log normal R.Vs

Hello every one, here is the problem. We have two Gaussian R.V's : z1 and z2 such that z1~N(mu1,sig1) and z2~N(mu2,sig2). Now if have two other...

• Replies: 4
• Views: 2,824
05-13-2012, 09:11 AM

I been trying to figure this out for so long, i just dont get it. if anyone can explain the answer it'd be very much appreciated. A box of 100...

• Replies: 8
• Views: 2,216
05-12-2012, 01:37 AM
11. ### A question in probability

i wanna know the difference between P(A∩B) and P(A|B) i don't mean in the law i mean its meaning what i know is P(A∩B) ==> is the probability of A...

• Replies: 1
• Views: 1,624
05-11-2012, 11:39 AM
12. ### Expectation doesn't exist!

A game is played as follows: A pile contains x dollars and a coin is flipped. Each time a heads occurs, the amount in the piled is doubled and if a...

• Replies: 1
• Views: 2,524
05-11-2012, 01:17 AM
13. ### Binomial Distribution, 150 tosses of fair coin, P(40%<= X <=50%)

Hi, im getting the wrong answer for the following question and not sure why. (Question) A fair coin is tossed 150 times. Find the probability that...

• Replies: 2
• Views: 2,550
05-10-2012, 07:17 AM
14. ### Probability question

I need some help to prove this. https://docs.google.com/drawings/d/1M34iGB7u4C_kK3f-vcGTgDSuasIkRNORGmAWZ-bB5wk/edit?pli=1 Please, help me.

• Replies: 1
• Views: 1,677
05-09-2012, 09:37 PM
15. ### P-value Question

Hi! I have a question involving P-Values in a specific context. Suppose you have an 1-Way ANOVA with k groups. If you obtain a significant p-value...

• Replies: 2
• Views: 3,492
05-09-2012, 02:05 PM
16. ### Expected value

Could someone please explain the following? A guy and a girl play a game where they roll a dice. If the guy rolls an even number, the girl pays...

• Replies: 2
• Views: 1,685
05-09-2012, 01:21 PM
17. ### 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: 7,604
05-09-2012, 01:54 AM
18. ### Question on probability

Hello, I have a sample of 593 whole numbers. The mean of the sample is 183.1197. The standard deviation is 32.0713 My question is what is...

• Replies: 0
• Views: 1,310
05-08-2012, 11:12 PM
19. ### Almost lost 10\$ at the bar

First off, I am kind of drunk, so excuse the simple mistakes. I was just given even odds on a bet on 1 roll of 5 dice. (I didn't take it) Meaning we...

• Replies: 0
• Views: 1,202
05-08-2012, 03:13 AM
20. ### Help with strategy for a simple game for a book I am writing:

Hope this is the right forum to put this in....This is a strategy I am trying to fine tune for a book I am writing about the card game Pinochle. ...

• Replies: 2
• Views: 1,455
05-07-2012, 10:03 PM
21. ### Mutual independence -> Conditional independence ?

hi, all! I have the following question about relations between conditional independence and mutual independence: Does Mutual independence imply...

• Replies: 1
• Views: 2,448
05-07-2012, 09:31 AM
22. ### Probability question

Okay so heres the information given and the question. Information: 1) 60% of U.S. women 18 yrs and older believe driving age should be 18 2)...

• Replies: 3
• Views: 2,679
05-05-2012, 03:22 PM
23. ### Poisson or Binomial

Hi, im trying to make sure i have the difference between when to use Binomial and Poisson distributions firmly understood. Regarding the following...

• Replies: 5
• Views: 9,506
05-03-2012, 08:19 AM
24. ### Card Pairs Problem with a Twist (TV Gameshow)

Hi I'm working out a solution for a TV gameshow which leads me to a problem... I'd like to know the probability of finding a pair of cards in the...

• Replies: 0
• Views: 1,532
05-03-2012, 04:50 AM
25. ### Hopefully Simple Question

I've been out of school too long to remember how to do this but, my friend, a principal had brought up an interesting convo about some of his...

• Replies: 11
• Views: 3,749
05-02-2012, 03:11 PM
26. ### Bivariate Normal Distribution

I can't figure out this problem. The definition for Bivariate Normal Distribution is too long and complicated to type, but can be easily found if...

• Replies: 1
• Views: 5,121
BGM
05-02-2012, 03:12 AM
27. ### Pdf

Please solve this problem If the reandom variable x has the pdf f(x) = 3x (0<x<1) f(x) = 0 (elsewhere) then find the pdf of y = 4x +3

• Replies: 1
• Views: 1,194
05-02-2012, 01:44 AM
28. ### Probability

Dear expert's kindly solve this problem A normal population has mean 0.1 and sd 2.1. Find the probability that the mean of a sample of size 900...

• Replies: 0
• Views: 1,698
05-02-2012, 01:23 AM
29. ### Which sampling type to use?

What kind of sampling do researchers use to estimate population parameters on individual data? a. population sampling b.nonprobability sampling...

• Replies: 1
• Views: 1,690
05-01-2012, 09:36 PM
30. ### No clue when to use nCr or multiply the probabilites..

I'm completely baffled as to when to use nCr or multiply the probabilites.. Here's an example.. Jane buys 5 jam donuts, 4 cream donuts and 3...

• Replies: 1
• Views: 5,228
05-01-2012, 02:41 PM
31. ### Multivariate probability density and distance... help!!

Hi all. I'm far from a stats connoisseur, and will probably use all the wrong words and describe my problem poorly. But I've got to figure it out...

• Replies: 0
• Views: 1,796
05-01-2012, 11:58 AM
32. ### Final Exam Study Problem: Find P(Y<X-1) - Should I just use a double integral?

A shaded region with boundries y=x^2 ; y=0 ; x=2 The j.d.f. is... Fxy(x,y)= 1/(2x^2) ; 0<x<2 ; 0<y<x^2 Fxy(x,y) = 0 elsewhere Find...

• Replies: 3
• Views: 1,554
04-30-2012, 08:19 PM
33. ### Poisson distribution, no call on 3 days out of 5 between 10.00am and 10.10am

Hi, im having some issues with the following question. Question) A sales manager receives 6 phone calls on average between 9.30am and 10.30am on a...

• Replies: 2
• Views: 2,860
04-30-2012, 12:45 PM
34. ### probability question

The number of cracks in a section of interstate highway that are significant enough to require repair is assumed to follow a Poisson distribution...

• Replies: 2
• Views: 3,017
04-29-2012, 03:03 PM
35. ### Probability distributions?

Hi, I have this problem: Let Y be the number of fires a year and let X be the number of people who die in such fires each year. What are the...

• Replies: 4
• Views: 1,496
04-29-2012, 04:51 AM
36. ### probability question

The probability that an individual recovers from an illness in a one-week time period without treatment is 0.1. Suppose that 20 independent...

• Replies: 1
• Views: 4,211
04-28-2012, 09:55 AM
37. ### poisson problem

The number of cracks in a section of interstate highway that are significant enough to require repair is assumed to follow a Poisson distribution...

• Replies: 1
• Views: 2,234
04-28-2012, 09:36 AM
38. ### I need a Probability approach

Hi, Can you help with the query below? The agents are in charge of assigning a root cause to specific queries by selecting the correct entry in...

• Replies: 0
• Views: 2,202
04-28-2012, 06:28 AM
39. ### ball drop in a maze

A ball bearing is dropped at the top of the maze (see diagram). It has a 50% chance of going left or right at each junction. Find the probability...

• Replies: 7
• Views: 4,057
04-27-2012, 02:33 PM
40. ### Where is my mistake? Markov Chain

this thread can be deleted. thx

• Replies: 0
• Views: 1,174
04-27-2012, 10:27 AM
41. ### A question about sampling

Consider two probability distributions, A and B. A has greater variance than B, but A and B have equal means. We are not told anything about their...

• Replies: 13
• Views: 3,746
04-27-2012, 09:52 AM
42. ### Is it possible to explain this concept to me in simple English?

"Probability density function", particularly in how a histogram may provide an estimate of it. Roughly (very roughly) speaking, what's the...

• Replies: 2
• Views: 1,647
04-26-2012, 05:26 PM
43. ### Probability problem help

I'm needing a little help finding the probability of a problem, I think I did this right but would just like to confirm. The problem is about mean...

• Replies: 6
• Views: 3,286
04-26-2012, 04:03 PM
44. ### Parametrising LogNormal distribution knowing only sample mean, and 90th percentile

I'm a little stuck, and hope someone will be able to explain this to me. I have sample mean, and value of the 90th percentile of the sample. If...

• Replies: 1
• Views: 3,299
BGM
04-26-2012, 12:11 PM
45. ### E(X), bag with 6 red and 5 black balls, X = number of red balls

A bag contains 5 black and 6 red balls. Two counters are drawn, one at a time, and not replaced. Let X be "the number of red counters drawn". Find...

• Replies: 6
• Views: 4,044
04-25-2012, 12:52 PM
46. ### X and Y is independent. I didn't say that X and Y is conditional independent given Z.

X and Y is independent. (Note that I didn't say that X and Y is conditional independent given Z.) Still pr(X|Z) * pr(Y|Z) = pr(XY|Z) is always...

• Replies: 1
• Views: 2,350
BGM
04-25-2012, 02:34 AM
47. ### E(X) , Cov(aX,bY)

Let X and Y be random variables with the density f(x) such that f(X)=1 for 0<x<1 and f(x)=0 for x<0 and x>1. We have that Var(x) = Var(Y). 1)...

• Replies: 12
• Views: 14,321
04-24-2012, 08:52 PM
48. ### Propability question

Hi all I have one mb stupid question but I dont know the answer. If we have chance of 20% to get something what is the whole chance to get this...

• Replies: 1
• Views: 1,698
BGM
04-24-2012, 04:49 PM
49. ### 2 four sided dice, probability of 1 dice = 3, sum = even

2 four tetrahedral dice with sides, 1,2,3,4. the two dice are thrown, what is the probability that given the first dice is a 3, the sum of the 2...

• Replies: 1
• Views: 11,395
04-24-2012, 08:56 AM
50. ### summing two probability density functions---Gompertz hazard model?

Hi, r-help members. I have a question about summing two density distributions. I have two samples from which I've estimated hazard parameters for...

• Replies: 0
• Views: 3,221
04-23-2012, 04:44 PM
51. ### independent vs mutually exclusive (confusion)

I apologize in advance for asking such a stupid question but im having some serious issues getting my head around this concept. At present im using...

• Replies: 3
• Views: 1,941
BGM
04-23-2012, 02:25 PM
52. ### Only one of two events occurs

P(A) = 8/15 P(B) = 1/3 P(A|B) = 1/5 (Question) calculate the probability that only one event occurs. i have already calculated that the...

• Replies: 3
• Views: 6,134
04-23-2012, 11:48 AM
53. ### Expected value! E(Y|min(Y,t))

Any hints would be appreciated :). Suppose that d.f. of Y is F(y)=1 - e^{-y}, y>0. Take t>0. Find E(Y|min(Y,t)) and E(Y|max(Y,t)) Note:...

• Replies: 2
• Views: 2,131
Kol
04-23-2012, 11:26 AM
54. ### Fishing Probability

The probability that Pete will catch fish on a particular day when he goes fishing is .8. Pete is going fishing 3 days next week. The probability...

• Replies: 1
• Views: 6,448
04-22-2012, 04:17 PM
55. ### Exponential likelihood ratio test help

Hello all, I am trying to get a grasp of likelihood ratio tests. Can any one help me with the following problem? Exponential likelihood ratio...

• Replies: 1
• Views: 2,814
BGM
04-22-2012, 03:12 PM

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