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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: 30,309
09-30-2005, 09:44 AM
1. ### Help with probability, please! I've already done some work, just need some extra help

I need to calculate the probability of at LEAST five shoppers entering the mall between 11 and 11:05, with them entering at an average of 120/hr I...

• Replies: 0
• Views: 1,898
03-25-2009, 10:03 PM
2. ### Type of Distribution, Central Limit Theorem?

Question: a roulette wheel has 38 slots, numbered 0, 00, and 1 through 36. if you bet 1 on a specified number you either win 35 or lose 1 if it...

• Replies: 0
• Views: 2,349
03-25-2009, 09:33 PM
3. ### probability question

i decided to erase my question. I found it posted elsewhere on this forum. Thank you!!

• Replies: 0
• Views: 1,965
03-25-2009, 04:56 PM
4. ### normal distribution ...help?

Can Someone please help me solve this?:confused: The credit score of a 35 year old applying for a mortgage at Ulysses Mortgage Associates is...

• Replies: 0
• Views: 2,241
03-25-2009, 02:11 PM
5. ### MLE for iid sample

I am trying to find the MLE of theta where the pdf is f(x;theta)=theta.x^(n-1) and then show that its variance-->0 as n-->inf I have found the...

• Replies: 4
• Views: 3,626
03-25-2009, 02:20 AM
6. ### Random sample from a gamma distribution, several questions about same problem

Consider a random sample X1, X2, ... ,Xn from a Γ(α=3, λ=1/θ) distribution. So far i have figured the following out: p.d.f = /3Γ] x^2 e^(-x/θ)...

• Replies: 1
• Views: 4,679
03-24-2009, 11:50 AM
7. ### need help with constant failure rates

Hi, I understood the concept of constant failure rates, but how do I go about a problem with identical components being tested. For eg: Suppose...

• Replies: 1
• Views: 3,336
03-23-2009, 12:37 PM
8. ### What kind of stats do I use to work this out?

Hi guys, Just signed up so I can post this, but I lurk here quite often. I hope this is the right section. I need help finding out what kind of...

• Replies: 2
• Views: 2,907
03-22-2009, 05:25 PM
9. ### Beauty Shop problem

Alice and Betty enter a beauty parlor simultaneously, Alice to get a manicure and Betty to get a haircut. Suppose the time for a manicure(haircut) is...

• Replies: 0
• Views: 3,972
03-22-2009, 02:13 PM
10. ### Combinatorics + Statistics Question

I have a homework question to find the probability that a permutation of 1000 symbols has between 432 and 789 cycles. X is a random variable denoting...

• Replies: 0
• Views: 2,087
03-22-2009, 11:49 AM
11. ### First differencing a nonstationary process

This is something that I can't quite understand about using first differences to turn a nonstationary process into a stationary one. If we regress dY...

• Replies: 0
• Views: 3,023
03-22-2009, 10:50 AM
12. ### mutually exclusive events

Hi guys, please help. I have to check whether the following events are mutually exclusive: (a) P(X) = 0.2, P(Y) = 0.3, P(Z) =...

• Replies: 6
• Views: 2,888
03-21-2009, 04:46 PM
13. ### montecarlo simulation

I wish to simulate negative binomial numbers by montecarlo method. Negative binomial (NB) is obtained by considering that the poisson parameter...

• Replies: 0
• Views: 2,009
03-21-2009, 06:51 AM

Hi there, I need to calculate probabilities using a venn diagram... anybody has a good link or attachment on that? it would really help. thank...

• Replies: 0
• Views: 2,605
03-20-2009, 03:59 PM
15. ### hey guys im new and i got a question to boot =)

hey guys im new to this forum and i got a couple of problems i cant wrap my head around ill list them here if a product has a 80% success rate....

• Replies: 1
• Views: 2,338
03-19-2009, 02:07 PM
16. ### help with hw problem plz!!!

given X~Bin(400, .01) find : P(X>5) This is what I did I just want to check if I did it right. since n is so large I found the expected...

• Replies: 1
• Views: 2,716
03-19-2009, 02:04 PM
17. ### Joint Probability Question

I was wondering if anyone knows how to do this: Five balls are drawn without replacement from an urn that contains 7 blue balls, 4 green balls and...

• Replies: 1
• Views: 2,924
03-19-2009, 02:01 PM
18. ### A problem related to Poisson process

Hi all, I have a probability problem. Can you help me? Thank you! Here is the problem: Consider the queueing system, there are n customers 1,...

• Replies: 0
• Views: 1,990
03-19-2009, 12:28 PM
19. ### Gelman Hierarchical Bayesian Beta Binomial model

Hi folks: Am new to the board and hoping to post something that might be useful to someone. I'm currently trying to learn Bayesian modeling on my...

• Replies: 1
• Views: 4,121
03-18-2009, 03:52 PM
20. ### Simulate truncated exponential

Hi, I have to simulate from Exp(1) which is truncated below by 0.5 using the method of inversion. That is simulate a random variable X~Exp(1)...

• Replies: 1
• Views: 5,705
03-18-2009, 12:43 PM
21. ### Probability Question

In a trivia game, there are five questions, of which I can wager 1, 2, 3, 4, or 5 points on each. (I get the points for a correct answer, but no...

• Replies: 0
• Views: 2,188
03-16-2009, 03:07 PM
22. ### Cumulative distribution function help!

Hey, I'm new here. I'm stuck with this problem. Will post what I've tried to do. Hopefully someone can provide hints to help me out. Thanks. If Z...

• Replies: 1
• Views: 3,680
03-16-2009, 12:58 PM
23. ### Central Limit Theorem

I have been trying for 3 hours and can not figure out what to do. My teacher included this section and it was not in the textbook. I do not know what...

• Replies: 1
• Views: 3,049
03-15-2009, 01:27 PM
24. ### Binomial distribution help plz..

A multiple-choice test has 6 questions each with 4 responses, one of which is correct. The lowest number of correct answers a student must obtain in...

• Replies: 2
• Views: 3,999
03-14-2009, 04:15 PM
25. ### 13 card straight - Calculation correct?

Hello! I am trying to compute the Pr. of being dealt a 13 card straight out of a standard 52 card deck. (ie. 23456789TJQKA) Here's my...

• Replies: 1
• Views: 5,338
03-14-2009, 01:38 PM
26. ### probability excel lab

The following lab assignment is really confusing regarding where to begin. I'm not sure if I need to use a formula or if I need to just plug the...

• Replies: 1
• Views: 4,470
03-12-2009, 04:47 PM
27. ### picking 50 yellow marbles

If there's a jar with 663 yellow marbles out of 849 total marbles, what is probability that i will extract 50 yellow marbles in 50 tries?

• Replies: 6
• Views: 3,322
03-10-2009, 11:02 AM
28. ### functions of two random variables

Let X,Y have joint probability density function fxy(x,y)=2 and joint range space Rxy={(x,y):x>0,y>o and x+y<1} Set U=X/(1-Y) and V=Y Questions:...

• Replies: 2
• Views: 2,798
03-09-2009, 06:46 PM
29. ### joint distributions, marginals, conditional

I am trying to teach myself joint distributions. I've been struggling with how to know what limits of integration to use when finding the marginal...

• Replies: 0
• Views: 6,568
03-09-2009, 12:11 PM

I have no idea how to start or how to do it. Can someone be extremely helpful ? Question 3 (Unit 1) – 10 marks (a) The random variables V...

• Replies: 3
• Views: 3,149
03-08-2009, 02:38 PM
31. ### Using probability for pen and paper RPGs...

A character in the game can study from concentrated magic in physical form called "vis". The amount of experience points "xp" is derived from the...

• Replies: 1
• Views: 1,997
03-07-2009, 06:01 PM
32. ### Normality of predictors - negative binomial regression

Hi guys, As a part of my current research project I'm conducting a sequence of negative binomial regressions with counts of crime offences from...

• Replies: 2
• Views: 5,020
03-06-2009, 09:02 PM
33. ### Flip a coin probability problem

Hi, I have homework problem at which I'm looking for a couple of hours now and I'm not able to solve it: Two people flip a coin (head, tail):...

• Replies: 2
• Views: 3,570
03-05-2009, 03:12 AM
34. ### probability density function under softmax transformation.

Hi all, Given that random vectors X and Y are related by Y = softmax(X), and X has a normal distribution with mean m and covariance matrix C. ...

• Replies: 0
• Views: 3,905
03-04-2009, 06:19 PM
35. ### Stationary Probability for a Markov Chain problem

I have been given a problem like this: Find the limit of p^2n as n --> infinity. Our matrix p = | 0 0 1/4 1/2 | | 0 0 3/4...

• Replies: 0
• Views: 3,481
03-04-2009, 01:51 PM
36. ### Need Help, how to interpret the goodness of fit, bivariate probit model

I ran proc qlim in SAS, bivariate probit model, but dont know how to interpret the results. Could anyone please help me out of this problem.... ...

• Replies: 0
• Views: 5,501
03-04-2009, 04:01 AM
37. ### Generate random number using Inverse Transformation Method

Hi, I am looking for guidance on the proof of the Inverse Transformation Method to simulate a random variable having a continuous distribution. ...

• Replies: 2
• Views: 6,111
03-03-2009, 12:01 PM
38. ### conditional expectation behaviour

Hi, I had an exam the other day and I had to prove if some function was a martingale or not. I don´t remember it accurately, but I do remember I got...

• Replies: 0
• Views: 2,575
03-02-2009, 09:45 AM
39. ### homework help

I Figured out the answer...thanks for viewing... I've been staring at this problem most of the weekend and for some reason just can't seem to get...

• Replies: 0
• Views: 1,964
03-02-2009, 07:56 AM
40. ### Probability of sample

How do I calculate the probability of 25 women having a mean height between 66" and 70.5". How do I find a new standard deviation?

• Replies: 3
• Views: 3,070
03-01-2009, 11:49 PM

I need a bit of help understanding this concept. I have a paper published in Lancet that show data on the short-term and lifetime risks for...

• Replies: 2
• Views: 2,211
03-01-2009, 09:49 PM
42. ### something ANOVA-like?

I apologize for re-posting this question. I posted it a month ago in the probability forum, and after more than 100 views, there was no response...

• Replies: 1
• Views: 2,061
03-01-2009, 09:42 PM
43. ### Distribution

Figured it out on my own :o)

• Replies: 0
• Views: 1,783
03-01-2009, 07:13 PM
44. ### probability,variance,moment generating function

1. Let X denote the mean of a random sample of size 75 from the distribution that has the pdf f (x)=1, 0 <=x<=1. Calculate P (0.45 <X< 0.55). 2....

• Replies: 1
• Views: 4,268
03-01-2009, 01:58 PM
45. ### normal distribution problem

Question..?? I cant seem to get this right. Do I find the z-score then do the problem or... please help.. question The life span of oil-drilling...

• Replies: 4
• Views: 5,523
03-01-2009, 11:28 AM
46. ### Confirmation: Urgent!

Hey all, I just wrote my final exam and there were a set of questions I'm not sure I answered correctly: A deck of 52 cards is shuffled, then we...

• Replies: 6
• Views: 3,023
02-28-2009, 11:02 PM

Hi, I posted a similar thread in the "R" posting but thought I'd may as well post here as it is generic as well. To calculate lotto probability...

• Replies: 3
• Views: 2,773
02-28-2009, 08:21 PM
48. ### Hypothesis test

Hello, I have the following problem and I have no idea how to answer. Suppose that you are performing a one-tailed hypothesis test. " Assuming...

• Replies: 3
• Views: 3,575
02-28-2009, 02:06 AM
49. ### Joint Probability Distribution

Hello all! Having a bit of problems here with making the table for a joint distribution: Question: 3 Fair coins are tossed. Let X = #of heads in...

• Replies: 6
• Views: 10,313
02-27-2009, 07:51 PM
50. ### Student Enrollment Probability

Hey everyone, back again with another problem giving me problems. A local university reports that 3% of their students take their general...

• Replies: 6
• Views: 8,293
02-27-2009, 07:44 PM
51. ### Poisson Random Variables

Hey all, I have a very difficult statistics problem and it would be awesome if someone could help out. Full credit to whomever figures this, lots of...

• Replies: 2
• Views: 3,371
02-27-2009, 09:20 AM
52. ### probability distribution

A dealer sells 3 different models of a freezer having 12,14, and 16 cubit feet of storage respectively. Let x= the amount of storage pace purchased...

• Replies: 2
• Views: 3,400
02-27-2009, 06:56 AM
53. ### Homework help

Hello. I have a minor set back on my homework. So I have a homework problem which states find the probability of the indicated event if...

• Replies: 5
• Views: 19,422
02-26-2009, 11:15 PM
54. ### help with problem

Basic probablity question , someone help? A 2-out-of-3 system is one that will function properly if at least 2 of the 3 individual components in the...

• Replies: 1
• Views: 2,734
02-26-2009, 03:02 PM
55. ### study guide problem..having trouble

a mail order firm uses a parcel service 60% of the time with the order being late 2% of the time. The other 40% is used by local transportaion and is...

• Replies: 0
• Views: 2,134
02-26-2009, 02:54 PM
56. ### Binomial Expectation

I'm having a little problem following this Y~Bin(5,1/3) Find: E = E = 4E - 4E - 1

• Replies: 3
• Views: 2,738
02-26-2009, 09:36 AM
57. ### Random Variable Transforms help

1) Suppose X is an Exponential random variable with parameter λ: f(x) = λe-λx, for x > 0, where λ satisfies λ > 0 (a) Let U be a Uniform...

• Replies: 1
• Views: 3,193
02-25-2009, 02:52 PM
58. ### Probabilistic Independence

Hi, First time poster. Hopefully I won't break any rules. I'm sure you will let me know if I did. Question: Suppose that two dice are tossed....

• Replies: 5
• Views: 2,597
02-25-2009, 06:35 AM
59. ### normal distribution probability problem

ive got a problem that i have already solved and i am looking for verification it is right: eggs produced have an unknown distribution with a mean...

• Replies: 3
• Views: 2,831
02-24-2009, 07:52 PM

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