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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: 30,315
09-30-2005, 09:44 AM
1. ### Any suggestions on how to figure out these two problems????

Im getting frustrated because....I have been looking through my textbooks and notes trying to figure out how to set these two problems up...Can...

• Replies: 1
• Views: 4,656
02-19-2012, 05:47 PM
2. ### HELP! Please! Test on Monday!

:eek: Need help with these two. Have tried and tried and tried. Q1 Recent developments appear to make it possible for couples to dramatically...

• Replies: 1
• Views: 4,652
04-03-2006, 09:01 AM
3. ### Homework Help - Balls in Urn problem (hypergeometric distribution?)

Hi all, I need help with the following problem: The urn contains 5 black and 8 red balls. You close your eyes and remove balls from the urn...

• Replies: 5
• Views: 4,652
04-29-2011, 10:18 AM
4. ### probability

A congested computer network has a 0.002 probability of losinga data packet and packet losses are independent events. Alost packet must be resent....

• Replies: 1
• Views: 4,652
BGM
09-22-2013, 04:30 AM
5. ### probability of a machine failure at a certain hour of the day

Hello folks. I look after some servers at work, one of which is intermittently failing. In the 38 days since I set up monitoring, there have been ten...

• Replies: 2
• Views: 4,651
11-02-2008, 12:49 PM
6. ### Selection w/o replacement, prob. of nth selected being mth of a set

Here's the problem, and the solutions I've attempted and come up with: In a string of 12 christmas tree lights bulbs, 3 are defective. The bulbs...

• Replies: 1
• Views: 4,648
01-26-2009, 10:31 PM
7. ### Stochastic process, empirical CDF, probability for bound

From what I understand, a stochastic process is a family of random variables, each of which follows some probability distribution. Now, let's...

• Replies: 2
• Views: 4,647
01-07-2011, 12:56 PM
8. ### A combinations problem

Hello everyone! I’m only beginning to study statistics. The problem is easy, yet I need help :o A shelf contains 6 separate compartments. In how...

• Replies: 1
• Views: 4,644
01-11-2007, 05:58 PM
9. ### Homework problem, help me!

Circuit boards are produced by a machine. Each board may turn out to be defective (Outcome D) with probability 0.1, good (Outcome D') with...

• Replies: 4
• Views: 4,641
06-20-2012, 06:10 AM
10. ### Poll: Let's Make a Deal....

Monty Hall presents you with 3 doors. Behind one of the doors is a new car. Behind the other 2 doors, there's nothing. You make your choice of...

• Replies: 2
• Views: 4,639
10-17-2005, 10:14 AM
11. ### Video game equipment

Hello everyone, My friend has been playing this game called Tabula Rasa, and is trying to make the perfect armor for his character. In order to do...

• Replies: 5
• Views: 4,639
05-30-2008, 12:00 AM
12. ### painted cubes

How many different ways can 3 cubes be painted if each cube is painted one color and only the 3 colors red, blue, and green are available? (Order is...

• Replies: 3
• Views: 4,635
07-30-2009, 02:49 PM
13. ### Difference between mean and expected value

Could someone please explain as simply as possible the difference between mean and expected value? Here is my problem: This is for my math stats...

• Replies: 2
• Views: 4,635
12-07-2013, 11:06 AM
14. ### Credit Card Roulette - Expected Value

4 people just finished dinner and the bill arrives. The total tab is \$100. When paying for the bill what is better (for the individual): (1) split...

• Replies: 1
• Views: 4,633
06-16-2008, 04:08 PM
15. ### Conditional Probability

What is the chance that the seventh card from the top of the deck will be a heart? This question really stumped me. I thought and then divided by...

• Replies: 5
• Views: 4,633
07-11-2010, 02:49 PM
16. ### Time Independent Poisson Regression

Hi there, I'm new to all this and am looking for an explanation in Layman's Terms Level 1 (level 1 being your average primate.....level 10 being a...

• Replies: 5
• Views: 4,633
11-03-2012, 02:30 PM
17. ### Comparing CDFs using Chi squared?

HI, I have a set of data from which I can construct the cumulative distribution function. I then compare this contructed CDF with the CDFs of a...

• Replies: 3
• Views: 4,632
07-10-2008, 07:44 AM
18. ### Bayes' Theory

Hi i'm currently working on a horse race prediction project and trying to include bayes' theory in my project. The thoery is new to me I am trying to...

• Replies: 2
• Views: 4,628
04-19-2010, 03:21 AM
19. ### what is a log normal?

Hi there, I have a question regarding the log normal and normal distribution. What I think is that if Y has a normal distribution then X=log(Y)...

• Replies: 2
• Views: 4,627
04-06-2010, 09:11 AM
20. ### Area under the sampling distribution curve

Hi, Given a random sample size of n=10 (from a normal population) and a standard deviation of 5, how can I calculate the area under the sampling...

• Replies: 2
• Views: 4,626
08-25-2008, 04:11 PM
21. ### Small question in stochastic processes

fair coin toss: X(t,H)=cos(t) if heads shows X(t,T)=sin(t) if tails shows Introduce a Bernoulli random variable B and express X(t) in terms of...

• Replies: 1
• Views: 4,625
BGM
11-09-2010, 03:26 AM
22. ### How do I calculate probability using excel?

I have 8 weeks worth of fantasy football scores from 12 different teams in a MS excel spreadsheet. Each team plays a different team every week. Is it...

• Replies: 3
• Views: 4,624
11-04-2011, 12:17 PM
23. ### Help!!

In a recent survey about appliance ownership, 58% of the respondents indicated that they own Maytag appliances, while 24% indicated they own GE...

• Replies: 5
• Views: 4,623
10-21-2012, 10:34 PM
24. ### Transformations

Hi! Suppose X ~ U(0,1). If we let Y = -ln (x) and then find the density of Y, we get the exponential distribution (with rate parameter = 1). ...

• Replies: 4
• Views: 4,621
07-12-2010, 03:28 PM
25. ### Two Random Variables Normal Distribution

X1 ~ N(3,2^2), X2 ~ N(-8, 5^2) Let U = X1 - 5X2 Let V = -6X1 + CX2, where C is constant. (a) What are the distributions of U and V? I know U ~...

• Replies: 13
• Views: 4,615
10-19-2012, 11:00 PM
26. ### 3D Random Walk

Okay, so I've got this random walk problem here: (a) Using an appropriate Dirac-delta function, find the probability density w(s) for...

• Replies: 1
• Views: 4,614
04-12-2008, 11:32 PM
27. ### how many degrees of freedom do I need to make a Root Sum Square valid?

If I have two errors, that seems on the low end for using RSS. If I have a hundred, I feel pretty comfortable. I'm having trouble finding math...

• Replies: 0
• Views: 4,606
01-17-2011, 03:43 PM
28. ### independence proof

Hi, I got this problem about event independence, Let A, B, C are independent, prove or disprove that A U B and C are indepent. I tried to...

• Replies: 2
• Views: 4,605
07-01-2009, 11:34 PM
29. ### Same flat tire

Hello, I am unsure about how to solve this one: It's Friday afternoon and six fraternity brothers at UNC have just attended their last class of the...

• Replies: 7
• Views: 4,604
02-26-2014, 12:24 AM
30. ### Hi I need help w/ sampling distribution.

HI, I'm taking statistics and i was trying to solve a problem, but I couldn't solve it. I was wondering if you could help me out. Here's the...

• Replies: 4
• Views: 4,599
11-11-2005, 07:49 PM
31. ### Probability Question- Positive/Negative Disease

One percent of all individuals in a certain population are carriers of a particular disease. A diagnostic test for this disease has a 97 % detection...

• Replies: 4
• Views: 4,591
10-10-2012, 11:58 PM
32. ### Indicated probability

I need help with this. I have tried this every way I know possible. I know the answer, but can't find out how I actually get it. An airline...

• Replies: 1
• Views: 4,586
07-05-2009, 10:47 AM
33. ### Bernoulli / Geometric Distribution Question

This is a question that is on a study-guide for a test I have coming up, and I'm completely lost. I was sick when we covered Bernoulli's experiments...

• Replies: 1
• Views: 4,586
11-17-2010, 01:15 AM
34. ### Confused on total probability formula

I am very confused on how to apply the total probability formula. If X and Y are two independent continuous random variables with pdfs g(x) and...

• Replies: 2
• Views: 4,584
09-10-2009, 12:08 PM
35. ### what's the probability that x^2+bx+c=0 has real root?

can any one answer this one?

• Replies: 3
• Views: 4,582
BGM
07-20-2010, 05:47 AM
36. ### binomial distribuion problem

Estimate the indicted probability by using the normal distribution as an approximation to the binomial distribution. In one county, the conviction...

• Replies: 0
• Views: 4,578
05-14-2009, 04:53 AM
37. ### help with this problem

someone explain the answer of this question ...i have the answers but i want to know the formulas ... An assembly consists of three mechanical...

• Replies: 0
• Views: 4,575
01-18-2008, 02:40 PM
38. ### need help understanding interview question

Hello folks, I had a weird question which I am confused about. I was wondering if you anyone could help me or point me in the right direction (ie....

• Replies: 21
• Views: 4,575
BGM
06-24-2013, 12:41 PM
39. ### P value probabilites by hand/T chart

Thank you for taking the time to read my query. I appreciate it. I moved my query from statistics to probability because I really didn't get an...

• Replies: 0
• Views: 4,571
11-02-2010, 01:59 PM
40. ### Probability dealing with sample proportion

I know how to compute the sample mean but I have a problem dealing with sample proportion. The problem is compute the probability that another...

• Replies: 1
• Views: 4,569
10-16-2008, 01:06 PM
41. ### Axioms of probability and sigma additivity

The third axiom of probability states that given an infinite sequence of mutually exclusive events A1, A2, .... we have P(A1 U A2 U ...) = P(A1) +...

• Replies: 6
• Views: 4,565
02-03-2017, 04:06 PM
42. ### Some Help

Please. I think I am having a mental cramp right now. I want to know when are the times you subtract 1-so and so? The examples are below. Mean...

• Replies: 1
• Views: 4,563
10-03-2012, 09:14 PM
43. ### Probability Distributions

Hi all, I've got a question here, and i'm not sure if it's how it's written or what, but I'm not quite getting it. Consider an insurance policy...

• Replies: 1
• Views: 4,562
11-12-2009, 08:11 PM
44. ### Cumulative combinations

I wish to determine the probability of a team winning AT LEAST eight of its next ten games. I understand that 10C8 will tell me the probability of...

• Replies: 5
• Views: 4,562
07-04-2010, 10:12 AM

Hi everyone, I haven't done integration in a long time, so I just need someone to verify if my calculation is right. The question is: ...

• Replies: 2
• Views: 4,557
08-10-2009, 09:31 AM
46. ### help

I am having a difficult time understanding probability. Here are some questions I am trying to figure out. 1.) Several students are unprepared for...

• Replies: 1
• Views: 4,550
08-17-2007, 08:06 AM
47. ### simulating correlated, non-normal data: WHY DOES THIS HAPPEN!?

i have been experimenting with different methods to generate correlated, non-normal data for comprehensive-exam purposes and i'm finding something i...

• Replies: 21
• Views: 4,548
09-21-2014, 08:59 PM
48. ### Statistics HEEELLPPP!!

A lot of 1000 components contains 250 that are defective. Two components are drawn at random and tested. Let A be the event that the first component...

• Replies: 1
• Views: 4,548
02-24-2015, 11:14 PM

During the past forty years, the monthly rate of return of stocks has been approximately normally distrubuted, with u=0.75 percent and sigma=4.2...

• Replies: 10
• Views: 4,546
11-14-2005, 11:34 AM
50. ### Probability of Word within Word

Hello! I'm in dire need of help as I've been working on this for a couple days now. I've been to the help center around school and have had three...

• Replies: 2
• Views: 4,545
04-16-2008, 11:04 PM
51. ### Poisson process, last arrival in interval

Consider a Poisson process with rate lambda. Let L be the following r.v.: if there is an arrival in , then L is the time of the last arrival in ; if...

• Replies: 1
• Views: 4,545
09-02-2010, 08:48 AM
52. ### X=0 almost surely => E(X)=0

Axioms of expectation: 1. X>0 => E(X)>0 2. E(1)=1 3. E(aX+bY) = aE(X) + bE(Y) 4. If X_n is a nondecreasing sequence of numbers and lim(X_n) = X,...

• Replies: 14
• Views: 4,541
07-20-2009, 12:59 AM
53. ### Probability help needed

Each state of the 50 in the US has two senators. What is the probability that in a random committee of 50 senators (a) Maryland is represented (b)...

• Replies: 1
• Views: 4,540
09-28-2010, 11:39 PM
54. ### 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: 4,532
11-25-2010, 09:18 PM
55. ### 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: 4,530
12-03-2010, 06:28 PM
56. ### Probability integral transformation

Hey I've got a probably simple question concerning time series analysis but I don't know what I should do::( I did a in-sample estimation of...

• Replies: 0
• Views: 4,529
05-09-2009, 08:58 AM
57. ### Simplified Inventory Problem

Hello, I'm having trouble with the following problem. Suppose that it costs c dollars to stock an item and that the item sells for s dollars....

• Replies: 1
• Views: 4,529
BGM
11-01-2012, 02:57 AM
58. ### question about likelihood function/MLE

If a random variable Y has the following probability distribution: P (Y = 1) = p, P (Y = 2) = q, and P (Y = 3) = 1−p−q. A random sample of size n...

• Replies: 6
• Views: 4,527
08-06-2010, 10:25 AM

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