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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. ### Probablity

Hi Suppose there are 2000 capsules from Manufacturer A, 3000 capsules from Manufacturer B, and 1000 capsules from Manufacturer C. Each...

• Replies: 4
• Views: 3,949
12-09-2010, 12:08 PM
2. ### Random variable

Suppose that we have a very large collection of marbles, 30% of which are red, 20% of which are green, 40% of which are blue, and 10% of which are...

• Replies: 2
• Views: 4,435
12-09-2010, 11:41 AM
3. ### Help with Probability!

Hi. I came across a few questions tht i came across while studyin for a probability chapter. Just a little request, im very new to probability so u...

• Replies: 5
• Views: 20,101
12-09-2010, 10:41 AM
4. ### Probability of measuring points

Dear all I would like to ask a question from 'real life'. We are manufacturing pieces which will be assembled togehter for later use. between...

• Replies: 0
• Views: 3,390
12-09-2010, 02:04 AM
5. ### Probability of a combination of two separate outcomes, without replacement

All I am stumped with this one, best way to describe the problem is as follows; Suppose you have 10 red marbles, 10 blue marbles, 10 green...

• Replies: 1
• Views: 4,234
BGM
12-08-2010, 11:59 PM
6. ### Combination permutation

Suppose that from a class of students (of whom 14 are male and 16 are female), a committee of 10 students is chosen at random. The committee then...

• Replies: 0
• Views: 3,525
12-08-2010, 11:23 AM
7. ### Two part PMF for a Joint Distribution problem

Suppose X and Y have the following joint distribution p(x, y) = c(x^2 + y^2). For x = -1, 0, 1, 3 and y = -1, 2, 4: A) Find the value of c that...

• Replies: 2
• Views: 6,272
12-08-2010, 10:26 AM

1. The following data represent the pulse rates of females: Pulse Rate Frequency 60 - 69 12 70 - 79 14 80 - 89 11 90- 99 1 ...

• Replies: 3
• Views: 3,455
12-07-2010, 09:06 PM
9. ### Probability of the sample Mean

The weight (x) of an adult salmon in Lake Michigan is a normally distributed variable with the mean 5.5 lbs and a standard deviation of 0.5 lbs. An...

• Replies: 0
• Views: 2,607
12-07-2010, 06:11 PM
10. ### limiting distributions?

A club basketball team will play a 44-game season. 26 of these games are against class A and 18 are against class B teams. Suppose that the team will...

• Replies: 0
• Views: 3,986
12-07-2010, 06:08 PM
11. ### Question about uncorrelated random variables that are not independent

I understand that if random variables are uncorrelated, then Cov(X, Y) = 0 and Corr(X, Y) = 0 are among the 2 conditions. However, what is the...

• Replies: 1
• Views: 5,708
12-07-2010, 11:26 AM
12. ### Expanding MFGs as a power series......

Hey, I'm having trouble working this one out. Any help would be appreciated. I had to find the Moment Generating Function of a chi-squared...

• Replies: 1
• Views: 4,072
BGM
12-07-2010, 10:28 AM
13. ### probability

hello all question: a team of biologist has been studying the children's fishing pond. let x represent the length of a single tilapia taken at...

• Replies: 0
• Views: 1,878
12-07-2010, 12:08 AM
14. ### question about independent variables

Hi, all – So, my daughter just came to me with a homework problem. She already has the answer from the back of the book, but doesn't understand...

• Replies: 8
• Views: 3,154
12-06-2010, 11:14 PM
15. ### Transformations....again!

Let X, Y ~ Uniform(0,1). Define the PDF of i) X - Y ii) X/Y I know this problem can be solved by creating a picture and looking at the areas....

• Replies: 4
• Views: 5,362
12-06-2010, 10:57 PM
16. ### P. distribution for Finan. Mkts

Dear All, 1st of all, thanks for making this forum so interesting. I'm trying to find a prob. distrib. for financial mkts (like the stock...

• Replies: 4
• Views: 4,147
12-06-2010, 04:41 PM
17. ### Moment Generate function

Suppose we were to play a game with the following rules. We pay seven dollars to play the game. We then flip a (possibly biased, probability of heads...

• Replies: 5
• Views: 4,911
12-06-2010, 04:27 PM
18. ### Moment generating function

I have a random variable V with density function: f(v) = (2/3)v, for 1<=v<=2 what is the moment generating function? My answer came out to...

• Replies: 2
• Views: 4,290
12-06-2010, 03:21 PM
19. ### Bivariate Normal problem

PSAT scores: mean = 1200, SD = 100 (Let Random Variable = X) SAT scores: mean = 1300, SD = 90 (Let Random Variable = Y) Correlation p = .6 ...

• Replies: 0
• Views: 3,061
12-06-2010, 10:32 AM
20. ### Credit Card Probability

Last year 75% of Kmart Department Stores credit card purchases were for less than \$150. In a random sample of 200 credit card companies, what is the...

• Replies: 2
• Views: 4,786
12-05-2010, 08:03 PM
21. ### y follows a Poisson distribution with rate lambda*x

Assume that the number of faults in the roll, say y, follows a Poisson distribution with rate lambda*x, where x is the length of the roll. Does this...

• Replies: 4
• Views: 6,675
12-05-2010, 05:27 PM
22. ### Normal Distrubtion question

Hi, I have this question that I can not figure out: Suppose that in an apartment building run by the Probandstat rental company, the inhabitants's...

• Replies: 1
• Views: 3,995
12-04-2010, 04:17 PM
23. ### Help with a hw question

I am taking my first probability course and need some help. I am working on some homework. The question I am on now asks... Consider...

• Replies: 5
• Views: 5,519
BGM
12-04-2010, 12:51 PM
24. ### Tricky question

I have 9 balls in a bag numbered from 1 to 9. I take 1 ball and I guess its number before looking it. I put it on the side (extraction WITHOUT...

• Replies: 1
• Views: 2,674
12-04-2010, 03:55 AM
25. ### probability of a random sample without replacement

I'm having problems on how to approach the following question: Suppose that we have a very large collection of marbles, 30% of which are red, 20%...

• Replies: 1
• Views: 4,769
12-03-2010, 06:28 PM
26. ### Expanded Deck of Card Question

I have been given a question by my work. It feels like a doozy to me, but hopefully it's easier than I assume. Any help with equations would be...

• Replies: 1
• Views: 3,665
12-03-2010, 06:14 PM
27. ### Uniform distribution on a triangle

Hi All! So happy to find this site! If (x,y) is the value of the random vector (X,Y) and is uniformly distributed over the triangle with vertices...

• Replies: 10
• Views: 12,559
BGM
12-03-2010, 03:38 PM
28. ### Reading z-tables when you know the probability

I'm having trouble reading z tables. If anyone can help I'd be thankful as I feel I can't move on until I know how to do this. One of the...

• Replies: 2
• Views: 6,221
12-03-2010, 10:40 AM
29. ### Help with simple probabilities problem?

Hi guys, I'm having trouble finding a satisfactory answer to this one: what is the probability that, in a group of 7 people, you will find the...

• Replies: 3
• Views: 3,994
12-03-2010, 09:09 AM
30. ### distribution of stderr from distribution of variance?

I'm trying to duplicate a macroeconomic paper that uses MCMC analysis to derive time series and parameter values. The authors of the original paper...

• Replies: 0
• Views: 3,606
12-02-2010, 10:43 PM
31. ### Simple Probability Question

Hi. I have a simple probability question: Not counting the greens, what are the odds of getting 19 of the same color in a row in roulette? ...

• Replies: 7
• Views: 3,618
12-02-2010, 12:44 PM
32. ### 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: 3,724
12-02-2010, 11:13 AM
33. ### A question on exponential distributions

from an exponential distribution with expected value 0.2, if i get the mean of 20 observations, then repeat (get another 20) , etc, so in total 1000...

• Replies: 0
• Views: 2,173
12-01-2010, 07:25 PM
34. ### m&m probability

Hi can you look over my solution? I am having difficulty in C and D part(what do they mean by procedure?) Thanks :yup: 1) According to company...

• Replies: 1
• Views: 6,333
12-01-2010, 01:23 AM
35. ### Uniform Distn, Power Function

Let X1 , ... , Xn ∼ Uniform(0, θ) and let Y = max{X1 , ... , Xn }. We want to test H0 : θ = 1/2 versus H1 : θ > 1/2. Suppose we decide to test...

• Replies: 0
• Views: 6,981
11-30-2010, 07:09 PM
36. ### Finding pdf of Quotient

Let X ~ Uniform(0, 1) and Y ~ Exponential(1) be independent. Find pdf of X/Y For Y/X case, I understand that the pdf of this is integral of...

• Replies: 5
• Views: 3,218
11-30-2010, 05:04 PM
37. ### Conditional probability of an event that never occurred

Hi folks, I'm facing a problem right now...given three events A, B and C, is it possible to estimate the occurrence of events A and C together...

• Replies: 1
• Views: 1,977
11-30-2010, 12:22 PM
38. ### Need a formula for a one of these gamma densities

For the integral from for x^(s-1) * e^(-lambda * x) You have s and lambda, so is the final answer for this (s-1)! / lambda^(s) ? Or is it (s-1)!...

• Replies: 5
• Views: 4,027
11-30-2010, 12:26 AM
39. ### help with exponential distribution

X1,X2,...,XN are independently identically exponentially distributed with expected value of 5. How can I compute Xn when n=20 and N=1000? Then...

• Replies: 7
• Views: 6,546
11-30-2010, 12:13 AM
40. ### Simple marginal effects after probit

So I have cannot find pretty much any basic information on marginal effects after probit in STATA on the net or my textbooks, so any help would be...

• Replies: 0
• Views: 6,073
sif
11-29-2010, 08:39 PM
41. ### Pooled Variance Distribution

Hi, I hope I am posting this in the correct forum. I have two populations and I've been taking samples from each population and calculating the...

• Replies: 3
• Views: 8,358
11-29-2010, 07:59 PM
42. ### Probability rank-n

Hello Let y1,..yn be drawn from a normal distribution width known parameters. Let x be drawn from another normal distribution with known...

• Replies: 0
• Views: 2,316
11-29-2010, 12:51 PM
43. ### 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: 2,980
11-28-2010, 10:37 PM
44. ### 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: 3,334
c2q
11-28-2010, 05:52 PM
45. ### Expected value of second highest draw

Hello all, Suppose I take two draws from a uniform distribution on . I know that the value of the highest draw is equal to x. What then is the...

• Replies: 1
• Views: 5,852
BGM
11-28-2010, 02:01 PM
46. ### Properties of discrete random variables

Hello, would some one with more experience mind to confirm or correct me: For discrete random variables I know: E = aE+b and...

• Replies: 4
• Views: 7,710
11-28-2010, 12:37 PM
47. ### Probability that bus arrives to station ?

Hello! I have a problem.... A bus arives to station 07.15 but is often late. Uniform distribution! Bus is late between 0 and 7 minutes! a a)...

• Replies: 1
• Views: 3,596
11-26-2010, 10:44 PM
48. ### help convergence in distribution

If there is b1,b2,b3...bi a sequence with non negative real numbers, and the sum of them is 1. Also P(X=i)=bi for all positive integer i. How do I...

• Replies: 0
• Views: 2,060
11-26-2010, 12:30 PM
49. ### a doctor promises a 90% chance of a cure for your illness

for \$1000. For him to share the risk equally with you how much money should he put in escrow for you? Suppose you want him to share half the...

• Replies: 2
• Views: 2,868
11-26-2010, 10:06 AM
50. ### help with chi square freedom sums

How do i show that the a + is a ? How can i use moment generating functions to do this?

• Replies: 5
• Views: 5,418
11-25-2010, 10:12 PM
51. ### how to get probability from a normal distribution?

If I had Z=Y^3 where Y is a standard normal distribution. How would I approx. calculate the probability of Z<=1 ?, I would understand it if it was...

• Replies: 4
• Views: 4,850
11-25-2010, 09:18 PM
52. ### how to understand if difference between two freq is significant

Hi, I need a suggest, I am not a statistician. I have an observed frequency distribution. A - 47.7 B - 51.9 C - 0.4 The sample is N=1626.

• Replies: 2
• Views: 2,425
11-25-2010, 12:24 PM
53. ### 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: 2,171
11-25-2010, 11:30 AM
54. ### I have questions ??

Hi I have 3 questions. Let x1, . . . , xn be independent observations of a chi-square(k) random variable, with p.d.f. f(x)= 1/(2^k/Γ(k/2)) ...

• Replies: 1
• Views: 4,600
BGM
11-25-2010, 03:08 AM
55. ### MGF Standard Normal to Normal

Hi, I'm just doing some review problems and I've found the MGF of a standard normal random variable, X ~ N(0,1). After some tedious algebra, I...

• Replies: 3
• Views: 5,927
11-25-2010, 12:40 AM
56. ### question on convergence of probability

Show that Xn->0 (in probability) iff |Xn|->0 (in probability). What i have so far |Xn|->0 (in probability) iff for any ε>0 P(||Xn|-ε|>=0)->0 as...

• Replies: 0
• Views: 2,208
11-24-2010, 04:42 PM
57. ### How to get this number?

a) Variant P(x=0)=P(0,0)+P(0,1)+P(0,2)=0.27 P(x=1)=P(1,0)+P(1,1)+P(1,2)=0,4 P(x=2)=P(2,0)+P(2,1)+P(2,2)=0.33 expected value ( I do not know how...

• Replies: 13
• Views: 3,785
11-24-2010, 12:16 PM
58. ### help with convergence in probability

If Xn->X (in probability) and Yn->Y(in probability) and Cn=Xn+Yn and C=X+Y show that Cn->C (in probability). what i got so far |Xn-X|<=ε/2 and...

• Replies: 1
• Views: 2,757
11-24-2010, 01:20 AM

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