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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: 30,265
09-30-2005, 09:44 AM
1. ### Mutual information of two vectors

As with another poster on this section, I understand the ideas behind mutual information but am having trouble with finding information necessary for...

• Replies: 0
• Views: 4,120
01-02-2008, 09:11 AM
2. ### Proof for Pooling

Hello all, I have a research question regarding pooling probability data. The application is population genetics. Assume we have a population of...

• Replies: 0
• Views: 2,386
01-02-2008, 03:09 PM
3. ### probability generating function

Hi All, I'm new to the forum. I'm trying to learn a bit of statistics on my own (as a pastime) but I'm stuck with this problem: I have two...

• Replies: 0
• Views: 3,053
01-05-2008, 10:01 AM
4. ### Manipulating resulst - Bernoulli distribution

Say you are estimating the probabiilty of an event happening, and. you determine there is 30% probability of it occurring. You then run the trial....

• Replies: 0
• Views: 2,292
01-05-2008, 12:39 PM
5. ### moment generating function

Given a random variable X with a uniform continuous pdf (0 for x < a, 1/(b-a) for a <= x <= b, 0 for x > b) and a dependant variable Y = -lnX, how...

• Replies: 0
• Views: 3,631
01-08-2008, 09:10 AM
6. ### Means and Variances of Random Variables

A distribution of grades in a class (where A=4, B=3, etc.) is: x 0 1 2 3 4 p(x) .10 .15 .30 .30 .15 ...

• Replies: 1
• Views: 3,148
01-14-2008, 01:12 PM
7. ### Christmas Present Problem

May be this is a simple problem for the professionals but its driving me mad. Here is the problem: At Christmas time a group of people at work,...

• Replies: 10
• Views: 3,108
01-17-2008, 02:01 PM
8. ### 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: 4,571
01-18-2008, 02:40 PM
9. ### i need help with normal distribution please

i can't answer this example...can anyone help me asap please.. The diameter of the dot produced by a printer is normally distributed with a mean...

• Replies: 5
• Views: 6,827
01-18-2008, 03:59 PM
10. ### Assesing normality - Amateur question

Hi everybody, (First of all, excuse my poor english : It's not my native tong). I'm working for myself on a computer programm which will deal...

• Replies: 4
• Views: 4,133
01-21-2008, 11:11 AM
11. ### False negatives and positives

My head is in a knot with this problem! A lab carries out a test sequence on incoming goods to determine if they contain a trace element X. The...

• Replies: 0
• Views: 2,755
01-21-2008, 06:24 PM
12. ### normal approximation to binomial distribution.

hi everyone. so i have this stupid final project and i'm pretty sure i know how to do it but i just wanted to check my method. the question...

• Replies: 0
• Views: 4,794
01-21-2008, 06:59 PM
13. ### Standardized Normal Distribution and Exponential Probability Distribution

• Replies: 0
• Views: 8,949
01-23-2008, 11:32 PM
14. ### proof for expectation

hiii ppl here is a small problem i am stuck at, i have to prove that E(X) = in the limit from 0 to infinity where X is non -ve random...

• Replies: 0
• Views: 3,329
01-25-2008, 02:34 PM
15. ### condition expectation and variance

Let X, Y be independent exponential random variables with means 1 and 2 respectively. Let Z = 1, if X < Y Z = 0, otherwise Find E(X|Z) and...

• Replies: 0
• Views: 2,652
01-25-2008, 11:10 PM
16. ### I need help

I've been working on this one problem for a week now and can't seem to figure it out. All of the different solutions I have tried have all come out...

• Replies: 0
• Views: 2,145
01-28-2008, 05:21 AM
17. ### Help help null and alternative hypotheses

Null and Alternative Hypotheses -------------------------------------------------------------------------------- I have researched the site...

• Replies: 2
• Views: 3,109
01-29-2008, 09:57 PM
18. ### Old question - can't find answer

PiggyBank has narrowed its options down to two incentive plans: A. cash back when the consumer makes an online purchase; and B. cash back when the...

• Replies: 0
• Views: 1,938
01-29-2008, 10:07 PM
19. ### Expected value: an alternative way to calculate it.

We all know that the expected value of a random variable y with a Probability Density Function f(y) can be calculate as: EV = Int(0,inf, y*f(y)) ...

• Replies: 1
• Views: 2,512
01-30-2008, 09:05 AM
20. ### How to calculate optimal number of questions in a question bank

I am trying to determine the optimal number of questions (X) that should be in the question bank so that 2 students in the exam hall should NOT have...

• Replies: 0
• Views: 3,273
01-30-2008, 03:08 PM
21. ### Probability that an exponential variable is greater than poisson.

I need help with one problem in my class, the text is taken directly from the book: The life T (hours) of the lightbulb in av overhead projector...

• Replies: 1
• Views: 4,983
01-30-2008, 03:43 PM
22. ### SAMPLING DISTRIBUTIONS - I tried to answer the question please check my work!*!*!*!*!

There was no help, and I don't want to give away my work when nobody offers any help to me.

• Replies: 1
• Views: 2,445
02-01-2008, 03:58 PM

I am new to statistics and probability; the question that I am on is; On an eight question frue/false quiz, a student guesses each answer....

• Replies: 0
• Views: 2,407
02-02-2008, 05:22 PM
24. ### need help with MLE!!

:confused: 1) Suppose X1, X2, ..., Xn ~ Uniform(0, theta) independently, please find the MLE of theta. I just have no idea how to start this...

• Replies: 1
• Views: 1,849
02-04-2008, 05:47 PM
25. ### beta-binomial for repeated discriminative test

Hi everybody. I need advice on repeated discriminative test. It is a similarity test, i.e. I am interested in determinig that two items are...

• Replies: 0
• Views: 2,704
02-06-2008, 10:59 PM
26. ### log-logistic distribution function

I need to create a function (in Mathematica) to generate a log-logistic distribution (also called a Fisk distribution). I know the log-logistic...

• Replies: 0
• Views: 5,118
a^2
02-07-2008, 11:01 AM
27. ### weibull distributed waiting times

hi everyone, wonder if someone can help me - in the same way that a poisson process has exponentially distributed waiting times, what's the process...

• Replies: 0
• Views: 3,062
pep
02-07-2008, 11:13 AM

My friend asked me for his help and I'm stumped. Please help me find the right equation. Here's the problem: If I have a 3&#37; chance of drawing a...

• Replies: 2
• Views: 2,815
02-07-2008, 02:05 PM
29. ### Need help getting started

edit.......

• Replies: 0
• Views: 2,069
02-07-2008, 07:25 PM
30. ### Demography Probability Question

Question: What is the probability of having a livebirth (L) at a second birth given that the outcome of the first pregnancy was a stillbirth (D)?...

• Replies: 3
• Views: 2,639
02-07-2008, 09:58 PM
31. ### Maximizing Hourly Profit

A stock day trader has a winning system and he wants to maximize his profit per hour. He has found that when he trades 5 hours a day, 90% of the time...

• Replies: 0
• Views: 2,098
02-08-2008, 02:39 PM
32. ### Need Help on Probability Probs.

:confused: I'm having trouble with some problems: 1) Suppose that in a family, the probability of a child having black hair is .45, the...

• Replies: 7
• Views: 3,137
02-09-2008, 11:27 AM
33. ### Bayes Theorem

I have been doing some problems with Bayes Theorem, but I have one question that is more complex than the others and was wondering if anyone can help...

• Replies: 1
• Views: 3,100
02-10-2008, 08:29 PM
34. ### finding e10 need help lost

Given the sample space S={e1, e2, e3, …, e10}, where P(e1)=P(e3)=P(e5)=P(e7)=P(e8)=P(e9)=0.1 and P(e2)=0.05, P(e4)=0.12, p(e6)=0.14. Consider the...

• Replies: 0
• Views: 2,308
02-11-2008, 01:16 AM
35. ### Probability Question

A billion thanks to anyone who can help me with this problem: Let's say that there is a deck of only six cards labeled A through F And each...

• Replies: 0
• Views: 1,861
02-11-2008, 08:29 PM
36. ### h3Lp ()n cond'l prob and indePendence

guys, i need help w!th this one. Please. thank y0u in adv. ---- a c()mpany's mngt made a certain proposal t0 its representatives in d!fferent...

• Replies: 0
• Views: 1,997
02-12-2008, 12:23 AM
37. ### Probablity Question

So I need help!!! For a sales promotion, the manufacturer places winning symbols under the caps of 10% of all Pepsi bottles. You buy a six-pack. ...

• Replies: 1
• Views: 6,197
02-12-2008, 01:43 AM
38. ### Help.....

Can someone please help me. I have been working on this problem and cannot figure it out. I know it deals with the multiplecation rule, and that...

• Replies: 0
• Views: 2,360
02-14-2008, 12:32 PM
39. ### Help me please.. (expected value) Thanks

Suppose that 20 percent of the students who took a certain test were from school A and the average of their scores on the test was 65. Also,...

• Replies: 1
• Views: 2,826
02-16-2008, 03:51 PM
40. ### poisson probability problem

I have constructed this experiment to better understand poisson probabilities. Problem: There are two sets of data: lets choose a poisson type...

• Replies: 1
• Views: 2,708
02-16-2008, 04:00 PM
41. ### Tossing a coin

Hi everybody and sorry about my English I’ve a simple question and it seems typical but please before answering it thinks carefully because it is...

• Replies: 5
• Views: 2,949
02-17-2008, 10:50 AM
42. ### Expected value of sup - MLE

Hey guys Im struggeling to show the existence of an expeted value of a sup. The problem is to find the supremum of the absolute value of the...

• Replies: 0
• Views: 3,777
02-17-2008, 07:57 PM
43. ### Need Help-Probability Marbles

Would appreciate help with this probability problem. A bag of marbles contains 6 red marbles, 5 green marbles, and 4 yellow marbles. Three marbles...

• Replies: 1
• Views: 2,141
02-19-2008, 08:52 AM
44. ### Probability Problem Question

Hello all, I'm struggling quite mightily with this one problem (embarrassing to me once you see how simple it is). I've been trying to figure it...

• Replies: 4
• Views: 2,478
02-21-2008, 06:00 PM
45. ### Probability Problem

Hi all, I have been trying to come up with the correct answer for part c) of this question with no luck. A gumball dispenser has 38 orange...

• Replies: 4
• Views: 5,656
02-22-2008, 04:09 PM
46. ### Probability with Normal model.

According to the NHS, heights of adults may have a normal model with mean heights of 69.1" for men and 64.0" for women. The respective standard...

• Replies: 5
• Views: 2,470
02-22-2008, 08:34 PM
47. ### Easy problem, unsure on terminology

According to infoplease, 18.8&#37; of the luxury cars manufactured in 2003 were silver. A large dealership typically sells 50 luxury cars a month. Let...

• Replies: 5
• Views: 3,318
02-22-2008, 08:35 PM
48. ### Significance testing with probabilities of 100 percent

Hi, I have a question that I am beginning to believe may not even make sense mathematically, as I have tried to google it for hours with no luck:...

• Replies: 5
• Views: 3,142
02-24-2008, 01:09 PM
49. ### Variance

You have a total of \$1 to invest in investments X and Y that have the same expected return. It is known that Var(X) = 25 and Var(Y) = 36. a) If X...

• Replies: 1
• Views: 2,010
02-24-2008, 04:50 PM
50. ### I think I got it, but then... (A DRINKING GAME!)

400 accidents on a Saturday night were analyzed: Number of vehicles involved & whether alcohol played a role in the accident. The numbers are in the...

• Replies: 3
• Views: 3,181
02-25-2008, 03:19 AM
51. ### help

I can not figure this problem out! I don't think there is enough info, but there is an answer in the back: 0.271 The problem: Using Composite...

• Replies: 2
• Views: 5,248
02-25-2008, 01:09 PM
52. ### Standard deviations and profits?

So this is another question I attempted to solve but was stuck on the 2nd part of it: A store knows that the number of pies sold each day varies...

• Replies: 1
• Views: 5,808
02-25-2008, 01:16 PM
53. ### Batting Average & Probability

A softball team's first 4 hitters are Sam (batting average .500), Gina (batting average .400), Tom (batting average .737), and Kerry (batting average...

• Replies: 1
• Views: 5,301
02-26-2008, 01:43 PM
54. ### sealed bid problem

Your company is making a sealed bid for a construction project. If your firm has the lowest bid, you will pay another firm (a subcontractor) 140...

• Replies: 1
• Views: 4,382
02-26-2008, 05:27 PM
55. ### Real Roots??

:eek: I have no idea where to start on this one If a is uniformly distributed over , what is the probability that the roots of the equation...

• Replies: 0
• Views: 3,001
02-26-2008, 08:56 PM
56. ### Success by chance?

I have a problem where participants had to discriminate two objects, and success was defined was getting 9 correct in a 10 trial run - meaning that...

• Replies: 10
• Views: 3,744
02-27-2008, 11:27 AM
57. ### Help please! I can't seem to make sense of these!

A test consists of 10 true/false questions. To pass the test a student must answer at least 6 questions correctly. If a student guesses on each...

• Replies: 1
• Views: 4,242
02-27-2008, 04:34 PM
58. ### Help with these two questions, please? I am confused!

Hello Everyone, These are part of my unit on Binomial and Poisson distributions: 1) The average number of phone inquiries per day at the center...

• Replies: 7
• Views: 2,546
02-27-2008, 09:27 PM

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