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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: 30,208
09-30-2005, 09:44 AM
1. ### Probability Question

Question 1: Suppose that in a weekly lottery you have probability .02 of winning a prize with a single ticket and that you buy 1 ticket per week...

• Replies: 5
• Views: 3,388
BGM
10-19-2011, 03:46 PM
2. ### Probabilty Question

I am looking at 6 events. The probabilities of each occuring independantly are as follows: Event 1- 7% Event 2- 4% Event 3- 7% Event 4- 4%...

• Replies: 5
• Views: 3,312
BGM
10-19-2011, 03:46 AM
3. ### statistics

if T follows a t7 distribution, find t0 such that P(|T|<t0)=.9 and P(T>t0)= .05

• Replies: 2
• Views: 5,109
10-18-2011, 08:07 AM
4. ### Probability, University, Married, Car Insurance, Help!

Haha, I thought I'd be creative with my title.... let's get some facts straight, this has to do with probability and University but I'm not married...

• Replies: 1
• Views: 2,587
10-18-2011, 06:07 AM
5. ### Multinomial Distribution shortcut?

I'm wondering is there any kind of shortcut with the Multinomial Distribution. Suppose i have 6 balls:{3R,2B,1G} and i make 3 draws (with...

• Replies: 4
• Views: 3,299
10-17-2011, 03:05 PM
6. ### Dice and Don't Cares

Hi. I'm working on deriving a probability formula to help in some research I'm doing, but I've hit a wall. I've managed to reduce my problem down...

• Replies: 3
• Views: 1,947
BGM
10-17-2011, 08:19 AM
7. ### Conditional Probability Venn Diagram

I am having a very difficult time trying to determine how they got the probabilities shown in the Venn Diagram from the above information. I'm...

• Replies: 3
• Views: 5,514
BGM
10-17-2011, 03:09 AM
8. ### Using Bayes Theorem, need help.

I have been trying to solve this problem using Bayes theorem but know I have gone wrong somewhere. Question breaks down to this. defect occurs...

• Replies: 3
• Views: 3,103
10-17-2011, 01:23 AM
9. ### Third Moment about the mean

Let E=μ4 S=/σ^3, where E(X-μ)^3=E(X^3)-3+2^3 How can I rewrite the right hand side of the above expression in terms of μ, σ^2, S and μ4. ...

• Replies: 11
• Views: 8,713
BGM
10-17-2011, 12:06 AM
10. ### Expected value of Yi^2

Yi is i.i.d. N(0,σ^2) for i=1 to n. E=0, var=σ^2 Show that E = 1 if E = 0, how does the the sum of squared Yi's equal 1?

• Replies: 3
• Views: 5,550
BGM
10-16-2011, 11:48 PM
11. ### Express E[X-μ]^4 in terms of....

X is a random variable with moments E, E, E. Suppose var(X)= σ^2, skewness is given as S=/(σ^3). Express the right side of the following as in...

• Replies: 0
• Views: 132,799
10-16-2011, 10:52 PM
12. ### Question. Non parametric analysis in SAS

I have a question perhaps someone can easily answer. I used a random block design and couldn't get normal distribution on the data. I then switched...

• Replies: 4
• Views: 3,133
10-16-2011, 09:56 PM
13. ### Binomial Probability, Real Limits, X=0

Can someone have guessed on quiz and got all 50 questions wrong, but still get 100%? Thanks in advance! :D

• Replies: 7
• Views: 4,428
BGM
10-16-2011, 04:36 PM
14. ### Μarginal Distributions of f(x,y)

f(x,y) = e^(-x), 0<=x<inf, 0<=y<=1 To find the marginal PDFs here is what I did so far: Marginal Distribution of x: f(x) = integral...

• Replies: 2
• Views: 123,163
10-16-2011, 12:42 PM
15. ### need help on Conditional Probability problems...

Can anybody please help me to work out on following problems? 1. The probability Pk that a family has ‘k’ children is given by p0 = p1 = a, Pk =...

• Replies: 1
• Views: 2,706
BGM
10-16-2011, 01:01 AM
16. ### linearly independent

prove that if A= <------(it should to be a column not row, cuz i couldnt make it into a column form ) and the columns of B are independent ,...

• Replies: 1
• Views: 2,061
10-15-2011, 11:47 PM
17. ### Basic probability question

f(x) = x/4 for 0<x<2 = 1- x/4 for 2<x<4 = 0 otherwise Find c1 and c2 such that probability of (c1<x<c2)=0.6 So I tried to plot the...

• Replies: 3
• Views: 1,797
BGM
10-15-2011, 03:27 AM
18. ### probability given p=.10

Question: A manufacturer of power meters, which are used to regulate energy thresholds of a data-communications system, claims that when its...

• Replies: 4
• Views: 3,341
10-14-2011, 05:30 AM
19. ### Poisson Distribution and binomial distribution

Can somebody explain the practical meaning of the mean (np, or lambda) and variance (np) of the Poisson Distribution with a real example? I am...

• Replies: 3
• Views: 3,429
BGM
10-14-2011, 01:44 AM
20. ### central limit theorem

The central limit theorem can be used to analyze round-off error. Suppose that the round-off error on one number is represented as a uniform random...

• Replies: 0
• Views: 1,915
10-12-2011, 07:32 PM
21. ### Uniform and Independent Probability (Simple Problem)

Hey there, I have a quick question. The problem: 3 numbers, say X, Y, and Z are chosen from a set of numbers (1 to n) where n is greater or...

• Replies: 7
• Views: 3,297
10-12-2011, 08:17 AM
22. ### Need help with what is probably a simple EMV problem concerning demand

Hi all, I am becoming quite frustrated with this problem, and I KNOW it's simple, I just don't feel comfortable with either answer I come up with....

• Replies: 0
• Views: 1,398
10-12-2011, 05:12 AM
23. ### Random Variables with not degenerated distribution

Hi How do i proof the following: Consider (, B|, lebesgue measure) Show that there exists no family of iid rv {X_t:t \in } with not degenerated...

• Replies: 0
• Views: 1,675
10-11-2011, 03:00 PM
24. ### geometrical distribution question

x has a geometrical distribution with parameter p 1.show that P( X= m+k| X>m) = P(X=k) 2. also explain the means of this equality please...

• Replies: 3
• Views: 2,717
BGM
10-11-2011, 05:09 AM
25. ### probability, independent or dependent

Hello. I roll a dice twice. Let's say that A = odd number on first, B = even number on second, C = sum is odd. Now, I need to calculate P(A),...

• Replies: 7
• Views: 3,166
10-10-2011, 09:56 AM
26. ### Basic Probability Homework

We just stated to have about probability at the ongoing course. We have this Exercise which I, apparently, cannot figure out how to calculate. "...

• Replies: 4
• Views: 3,271
10-10-2011, 08:13 AM
27. ### Random Result of an experiment

Hello, I am analyzing some data in order to classify between two groups. My test set is rather small, let's say n1 people from group 1 and n2...

• Replies: 2
• Views: 2,198
10-10-2011, 07:27 AM
28. ### I need some help with Probability Problem.

The local barber shop is home to three barbers, 1, 2, and 3. The barbers appear identical but vary in their ability to provide good haircuts. The...

• Replies: 5
• Views: 3,789
BGM
10-09-2011, 01:53 AM
29. ### Poisson or binomial or something completely different?

I need to calculate the probability of a Y/N type issue, with varying probabilities of success. For example, I need to know the probability of...

• Replies: 1
• Views: 2,311
10-07-2011, 09:35 AM
30. ### Hypergeometric?

I read online an erasure analysis by a well-respected independent company. An erasure analysis is used in educational testing for a paper-and-pencil...

• Replies: 0
• Views: 1,794
10-07-2011, 09:04 AM
31. ### Classical Probability

Greetings from new comer! Here is my question I could not figure it out by myself: There are two types of bags H and R in a single box (black box...

• Replies: 5
• Views: 2,404
10-06-2011, 08:09 PM
32. ### More education = less income?

Years ago a guy from ESA told me that at his 50 year high school reunion the only millionaire was the only guy who didn't go to college. ...

• Replies: 9
• Views: 2,539
10-06-2011, 05:58 PM
33. ### How to find the cummulative distribution function from a probability density function

Hi, The pdf is here: Uploaded with ImageShack.us This is what I have done, but the answer is wrong. May I know how should i do this?

• Replies: 1
• Views: 2,866
10-06-2011, 12:32 PM
34. ### exponential distribution light bulbs hypothesis testing

Two companies make a similar light bulb. Suppose random samples of light bulbs from both companies are obtained and the lifetimes for these light...

• Replies: 3
• Views: 4,771
BGM
10-06-2011, 12:05 PM
35. ### need help with stats

a games is played on a board marked off into a line of four squares. a player starts on the square numbered 2. on each turn, a six-sided die is...

• Replies: 1
• Views: 2,631
BGM
10-06-2011, 08:36 AM
36. ### Find the constant that makes f(x,y) a probability density function

Let X and Y have a joint density function given by f(x,y) =e^(-kX), 0<=X<inf, 0<=Y<=1, k is a constant, and 0 elsewhere Find the value...

• Replies: 12
• Views: 7,856
10-05-2011, 09:36 PM
37. ### Distributions and Percentages

HW problem here. Suppose that when the Slease company overcharges a customer, the distribution of the amount overcharged (expressed as a...

• Replies: 1
• Views: 3,645
10-04-2011, 05:22 PM
38. ### Binomial Distribution Problem - How to interpret the given information

Your company is running an audit on the Sleaze Company. Because Sleaze has a bad habit of issuing incorrect invoices, the focus of your audit is on...

• Replies: 5
• Views: 8,191
10-04-2011, 01:58 PM
39. ### Stochastic Problem, any help greatly appreciated

Admittedly I am a bit rusty with my stochastic modelling, but here is the question I have been given. I am just looking for a bit of a guide as to...

• Replies: 9
• Views: 3,407
BGM
10-04-2011, 12:27 PM
40. ### First post, stuck on question.

Hi all, got stuck on a problem and after googling for calculators for hours, finally asked myself, hmm there must be a statistics/probability...

• Replies: 2
• Views: 2,515
10-04-2011, 04:39 AM
41. ### HW: Probability of baby gender given ultrasound results

Given the data on 1000 births, determine if an ultrasound is a reliable method for predicting unborn gender: Ultrasound predicted female/Actual...

• Replies: 1
• Views: 7,065
10-02-2011, 09:02 PM
42. ### Probability problem

Find the conditional probalilities of the indicated events when two fair dice (one red and one green) are rolled: The sum is 6, given that the...

• Replies: 5
• Views: 6,661
10-02-2011, 05:12 PM
43. ### Probability assignment

Let Y be binary variable P(Y = 1) = P(Y = 0) = 0.5 and X a random variable uniform on when Y = 0 and uniform when Y = 1. Draw mean of X and P(Y =...

• Replies: 0
• Views: 1,655
10-02-2011, 09:42 AM
44. ### A challenge problem (for me at least)

Hello everyone, this is my first post on this forum. My name is Ryan and I am a first year grad student in electrical engineering at a college in...

• Replies: 1
• Views: 3,613
BGM
10-02-2011, 01:28 AM
45. ### Hi, i'm new to probability and to this site and I need help ^^

Hi, it would be very appreciated if someone can help me figure out how to find part b) and c) please. Problem: A work crew for a building...

• Replies: 3
• Views: 2,359
BGM
10-01-2011, 05:01 PM
46. ### Probability of new lottery

Hi everyone, I come from the Czech Republic and I received a business case at work. I am supposed to come up with a new lottery which would be a...

• Replies: 3
• Views: 2,518
BGM
10-01-2011, 03:07 PM
47. ### Need some tips for a couple of proofs.

Hi there. I have been working on these problems but I'm not sure if what I'm doing is right. 1) I'm trying to prove that two R.V.s X & Y are...

• Replies: 1
• Views: 1,712
10-01-2011, 01:14 AM
48. ### i need help with this please!!!!

Angus reid conducted a survey of adult canadians finding that over all 56% supported the legalization of marijuana. the percenatage of support was...

• Replies: 1
• Views: 2,088
09-30-2011, 11:50 PM
49. ### conditional variance problem

hi there, not sure on how to approach this problem. I'm a bit lost. how can I show that a rv y which can be expressed a function of rv x, say...

• Replies: 0
• Views: 1,648
c2q
09-30-2011, 06:51 PM
50. ### 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: 2,307
c2q
09-30-2011, 05:06 PM
51. ### Finding the max and min P-value from an F-tets

There is a following task in my econometrics HW: 1) I have 25 values of the {X} random value. First I find the variation, then the estimation for...

• Replies: 7
• Views: 8,916
BGM
09-30-2011, 07:28 AM
52. ### New to stats, stuck on a probability problem

Hi there, I'm new to stats, stuck on how to get any further with this question. Not to sure on how to read the tables... Mean= 1250 Std = 120...

• Replies: 1
• Views: 2,448
BGM
09-29-2011, 06:29 AM
53. ### Yet (another) derivation from linear mixed effects regression...

hello there... first of all, thank you very much to everyone who has replied to my questions and has helped me understand these things a little bit...

• Replies: 3
• Views: 2,028
09-28-2011, 08:07 PM
54. ### General question on a likelihood result

In my stat inference class, we've been covering likelihood a bit. We were shown a result that is identical to the one posted here:...

• Replies: 2
• Views: 2,875
09-28-2011, 07:05 PM
55. ### Card Problem

Hi everyone, My problem is something like this: I have a deck of cards, without jokers (52 cards total). 30 cards are dealt. What is the...

• Replies: 1
• Views: 1,561
BGM
09-28-2011, 04:27 PM
56. ### Coin toss question

How about a hint about how to approach the following problem. If you toss a fair coin X number of times, what would be the probability that the...

• Replies: 10
• Views: 3,426
BGM
09-28-2011, 03:45 PM
57. ### Determine how close a real distribution is to an ideal one.

My apologies if this is an insultingly easy question: I'm trying to determine how close a real distribution is to an ideal one. Example: a...

• Replies: 1
• Views: 1,566
09-28-2011, 11:28 AM

City A has a population of 4 million, and city B has 6 million. Both cities have the same proportion of women. A random sample (with replacement)...

• Replies: 1
• Views: 3,407
BGM
09-28-2011, 04:23 AM
59. ### Likelihood Theory

Hi. I'm working with the exponential density f(x;theta) = theta * exp (-x*theta). I'm asked to verify the Var = -E. I've worked out the right...

• Replies: 3
• Views: 3,430
09-26-2011, 10:25 PM

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