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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: 30,384
09-30-2005, 09:44 AM
1. ### Binomial probability problem

I have a problem working out the answer to this problem using the binomial formula. Assume an airline operates a short haul flight form Edinburgh...

• Replies: 4
• Views: 3,298
08-04-2010, 10:57 AM
2. ### Clustering in SPSS

Hi, This forum has been of great help so far. THANKS. I have another question.:p I have some 170 cases which I want to classify according...

• Replies: 4
• Views: 3,408
08-18-2010, 04:36 PM
3. ### Calculating Joint Probability

If I have uniform random variables X and Y in the range (a,b), how can I calculate joint probability distribution function p(y,x) for y...

• Replies: 4
• Views: 8,745
BGM
08-19-2010, 02:11 PM
4. ### Is it possible to calculate a binomial distribution with a non-constant p?

Here's the actual problem I'm faced with. Suppose a segment of dna with 100 mutations (SNPs) which occur at different frequencies from each other and...

• Replies: 4
• Views: 4,515
BGM
08-26-2010, 12:04 AM
5. ### My probability practise

Hi, I am just trying to improve my probability concepts.. I came across this question.. Just let me know if I am correct? Thanks here is the...

• Replies: 4
• Views: 5,090
BGM
09-08-2010, 04:30 AM
6. ### can anyone help on this one?

Given two i.i.d uniform random points x and y on the interval , what is the average size of the smallest of the three resulting intervals?

• Replies: 4
• Views: 2,462
09-11-2010, 10:04 AM
7. ### Gamma Distribution parameters

Hi, I'm trying to understand the theory behind the probability distributions specifically what do the shape and scale parameters for gamma...

• Replies: 4
• Views: 7,550
BGM
09-28-2010, 01:14 AM
8. ### how to solve this???

An exam starts at t=0 & is supposed to be over at t=3.The students are asked to "wrap it up" at t=2.5.The relative number of students finishing an...

• Replies: 4
• Views: 2,685
09-22-2010, 02:39 AM
9. ### wikipedia entry

I was reading about false positive and found this wikipedia entry, can this be true? how come probability is greater than 1?

• Replies: 4
• Views: 3,012
09-20-2010, 08:42 AM
10. ### How to modify this function to be a probability density function????

f(t)=t^2 (1-t)^2 (u(t)-u(t-1)), where u(t) is the unit step function. SHOULD I INTEGRATE f(t) where i get F(T) AND THEN DIFFERENTIATE F(T) TO GET...

• Replies: 4
• Views: 7,088
09-21-2010, 04:25 PM
11. ### help on probability question!

I can't seem to figure out how to go about solving this question: Workers for the health clinic measured the cholesterol of 1000 people selected...

• Replies: 4
• Views: 2,051
09-23-2010, 01:21 AM
12. ### Jump Discontinuities in CDF's

There aren't any examples of cumulative distribution functions with discontinuities in my textbook. I'm wondering what to do with something like...

• Replies: 4
• Views: 6,175
10-27-2010, 12:33 PM
13. ### Gaussian Probability - can I do this?

Hi :) I have a question regarding Gaussian distributions. I actually am not sure where to post this, but after reading thru a few threads, it might...

• Replies: 4
• Views: 3,481
09-28-2010, 10:49 PM
14. ### PLZZZZ Help!! a priori probability and posteriori PDF

Flipping a coin game.The coin is unkown,thus, the probability to have heads is unknown:P(H)=P{h}=p.Thus probability to have heads is a random...

• Replies: 4
• Views: 3,100
09-28-2010, 05:05 PM
15. ### Normal Distribution problem

Question: an instructor is administering a final examination. She tells her class that she will give an A grade to the 10% of the students who earn...

• Replies: 4
• Views: 2,793
09-28-2010, 11:36 AM
16. ### proofs are tricky

Hi everyone! Proofs have always been a major weak point for me and I'm really struggling with the problem below. Any help or pointers to get me...

• Replies: 4
• Views: 2,885
10-01-2010, 12:09 AM
17. ### Dependent normal distributions

I'm doing some stock market analysis for a personal project. If I have two stocks which generate returns which are normally distributed, what is...

• Replies: 4
• Views: 9,018
10-08-2010, 01:33 PM
18. ### from Uniform random variable to Logistic

Given U~Unif(0,1) and X=s*ln(U/(1-U)), where s>0 is a parameter, I am hoping to get F(x), where F(x) would turn out to be a logistic cdf F(x) =...

• Replies: 4
• Views: 2,903
10-08-2010, 12:21 AM
19. ### 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: 4,875
12-06-2010, 10:57 PM
20. ### Is this possible?

Hi, please help me out with this problem. I want to calculate P(X <= x) = P(sum(1->n)(Z_k) <= x) where sum(1->n)(Z_k) is the sum of Z_k from 1 to...

• Replies: 4
• Views: 2,065
10-22-2010, 08:23 AM
21. ### Bayesian inference -(unknown mean and variance | and a proof)

hello, i take a bayes lesson. there are 3 questions as my homework, i did one of them. i am new to statistics, so instructor said i can get help as...

• Replies: 4
• Views: 5,103
10-22-2010, 05:07 PM
22. ### help randoooomly chooooose

Hello Everyone, I have :confused: question: Define ni to be the number of families with i children, i = 1,2,3,…..,k. Define E to be the event...

• Replies: 4
• Views: 3,545
10-25-2010, 05:32 PM
23. ### my answer and Q

Hi, can someone please have a look at my answer and Q? Thanks In advance:). Q:Let Pi represents the probability that the ith decision appears...

• Replies: 4
• Views: 3,119
11-16-2010, 11:13 AM
24. ### Estimating the number of red balls drawn

Assume that there are N jars numbered 1 to N. Each jar contains many balls. Assume that we draw a ball from i-th jar. The probability of drawing a...

• Replies: 4
• Views: 3,795
BGM
10-29-2010, 02:29 AM
25. ### Markov chain

There are two states, A and B; A is initial state from where Markov chain starts. If 5 out of 8 samples have probabilities P1, we move from A to B....

• Replies: 4
• Views: 3,257
11-04-2010, 04:36 PM
26. ### joint probability density function, using the Jacobian

X1 and X2 are independent random variables from a standard normal distribution so the joint p.d.f of X1, X2 = p.d.f X1 x p.d.f X2 = ( 1/(2pi)^1/2)...

• Replies: 4
• Views: 7,444
BGM
11-07-2010, 10:39 PM
27. ### Finding Mean and Variance for X^2 Given Mean and Variance for X

I am working on a question that has me stumped. X1, X2, ... Xn are normally distributed and independent. Each has a mean of 0 and variance sigma^2....

• Replies: 4
• Views: 72,539
11-08-2010, 06:47 PM
28. ### Joint Density Function - Exponentials

please delete, I overthunk myself on this one.

• Replies: 4
• Views: 3,124
11-06-2010, 10:52 PM
29. ### Poisson Distribution Conditional Probability

Hello, My name is Chris and I would greatly appreciate some help concerning the folowing Probability problem. Suppose that the number of...

• Replies: 4
• Views: 15,280
11-08-2010, 10:53 AM
30. ### 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: 6,407
12-05-2010, 05:27 PM
31. ### very confused

if P( Z > x ) = 0.99 – 2.33 = x is it correct ? very confused= =!:o

• Replies: 4
• Views: 3,372
11-14-2010, 12:58 AM
32. ### Just starting with probability

Hi I am just starting with probability. I have a basic question. There are three rows R1, R2, R3, and a target can appear in any of the...

• Replies: 4
• Views: 2,555
11-16-2010, 01:00 PM
33. ### Question about a wording/context of a problem

I won't give the problem in its entirety here, because my only question is the wording/context of it. But I will only give a summary. Both X and Y...

• Replies: 4
• Views: 2,656
11-16-2010, 04:40 PM
34. ### random variable convergence

Wn has density / for 0<x<1, and 0 otherwise. The random variable W has a uniform distribution on . Prove that {Wn} converges in distribution to W. ...

• Replies: 4
• Views: 3,186
11-20-2010, 03:00 PM
35. ### percentile for (1 - cumulative distribution function)

Hi, Before addressing my question, please let me define the context: The percentile is usually defined as the value of a variable BELOW which a...

• Replies: 4
• Views: 13,038
01-04-2011, 10:09 AM
36. ### 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: 7,211
11-28-2010, 12:37 PM
37. ### 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: 4,559
11-25-2010, 09:18 PM
38. ### 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: 3,186
c2q
11-28-2010, 05:52 PM
39. ### 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: 3,828
12-06-2010, 04:41 PM
40. ### 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: 3,615
12-09-2010, 12:08 PM
41. ### joint pmf of 2 dependent variables

Hi, I am having trouble calculating the joint pmf of two "not necessarily independent" RV's. The information given was that X~Bernoulli(p),...

• Replies: 4
• Views: 5,338
12-13-2010, 12:27 AM
42. ### How to find probability in this statistics problem?

We have "N" experiments with YES/NO outcome and in each experiment probability for YES is "p". If in "N-1" experiments we had "m" YES outcomes,...

• Replies: 4
• Views: 3,380
12-14-2010, 12:20 PM
43. ### Membership in group

This is from the Bertsekas Intro Probability book, 1st ed. How do you approach this problem? A class has 4 grad students and 12 undergrad...

• Replies: 4
• Views: 2,654
12-15-2010, 06:39 PM
44. ### Probability problem

Hello, I am a student and still new to statistics and have recebtly found this forum. I have this particular problem to solve and I need help: ...

• Replies: 4
• Views: 2,903
12-17-2010, 04:24 PM
45. ### RV distribution with hint

Let x be a RV that counts the number of clients that enter some place. It is initialized to 0 at time 0. The number of clients that enter per second...

• Replies: 4
• Views: 4,286
12-30-2010, 03:55 PM
46. ### National Lottery

Consider these two scenarios and decide which is *better* (better is purposely ambiguous here…). 1. Have one punt at the lottery and purchase 52...

• Replies: 4
• Views: 3,622
12-31-2010, 02:15 PM
47. ### Probability of Victory

Say I was looking at how all 14-seeds performed against 3-seeds over several years of the NCAA Basketball Tournament. And say I had several stats at...

• Replies: 4
• Views: 3,435
02-03-2011, 01:14 AM
48. ### Mgf

Let X and Y have the following joint probability distribution:- P(X=x,Y=y) = \frac{e^{-2}}{x!(y-x)!} , x=0,1,2,...,y ; ...

• Replies: 4
• Views: 2,295
01-21-2011, 08:43 AM
49. ### Why can't I use the transformation...

Why can't I use the transformation equation fy(y)=fx(x(y))AbsoluteValue to solve this problem: An actuary is reviewing a study she performed on...

• Replies: 4
• Views: 2,687
01-19-2011, 01:39 AM
50. ### Joint cdf/pmf- Multinomial Distribution.

I'll really appreciate if somebody could take time to explain the following question's answer. Suppose that (N1, N2) is multinomial with n=2,...

• Replies: 4
• Views: 6,988
BGM
01-30-2011, 11:41 PM
51. ### Sampling Distribution Question

I have a couple questions here that I think I am doing correctly, just want some confirmation? Thanks! 1. Suppose that the final exam scores of a...

• Replies: 4
• Views: 5,393
02-12-2011, 12:22 AM
52. ### How would I calculate triple coin flipping in sets?

Say you have three pennies. You throw them all in the air and record the way they land. Then you do this five more times for a total of six throws: ...

• Replies: 4
• Views: 4,852
02-19-2011, 08:33 PM
53. ### Help with Binomial & Poisson Distribution!!

Hello forum! I am trying to do complete my homework however I am unsure if I did what was asked correctly for one question and I am having issues...

• Replies: 4
• Views: 5,063
02-25-2011, 12:13 PM
54. ### Is this possible?

Hello, I've been pondering this question for a while but I don't think I have what it takes to come up with the answer. I'd really appreciate some...

• Replies: 4
• Views: 2,671
02-24-2011, 05:12 PM
55. ### probability of rocket launch failure

hi everyone. My statistics/probability knowledge is unfortunately striving towards zero, therefore I would greatly appreciate any kind of input on...

• Replies: 4
• Views: 6,927
03-03-2011, 10:24 AM
56. ### Probability in Census

Hey, having some trouble with a problem: The 2000 census allowed each person to choose from a long list of races. That is, in the eyes of the...

• Replies: 4
• Views: 7,117
03-15-2011, 05:25 PM
57. ### Distribution of sample mean using MGF

I'm not sure if I posted this in the right place, correct me if I'm wrong. I have been trying to solve this question for awhile now: Let...

• Replies: 4
• Views: 8,876
04-02-2011, 08:27 PM

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