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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: 30,406
09-30-2005, 09:44 AM
1. ### Card Problem--(More than meets the eye...hopefully)

Hmm, wondering if anyone can solve this problem, and possibly know which game show it came from: Say that you have 3 cards you can choose from:...

• Replies: 2
• Views: 3,273
12-14-2007, 07:45 PM
2. ### Hi, Emergency Help for Final Please!!

8 basketball players are to be selected to play in a special game. The players will be selected from a list of 27 players.If the players are...

• Replies: 3
• Views: 3,990
12-14-2007, 10:58 AM
3. ### Help on my final project Please!

All questions seem to be connected to one another. I think I have been able to work out questions 1 and 2. I have however,spent hours trying to...

• Replies: 0
• Views: 2,406
12-13-2007, 11:39 AM
4. ### Help in exponential dist..

Hi, I have a question like that below, Suppose daily demand for gas is an exponential random variable with mean 5000 liters.Each day yhe tank...

• Replies: 1
• Views: 2,793
12-13-2007, 07:16 AM
5. ### simple combinatorics problem

this problem has been solved, please delete this post

• Replies: 0
• Views: 2,759
12-12-2007, 11:27 PM
6. ### !HELP! in PROBABILITY Question! Please!

A Level Statistics Question (Probability) Q. In a class, 25% of students are British and 55% are American. If 15% are both British & American,...

• Replies: 1
• Views: 3,244
12-11-2007, 04:49 PM
7. ### Probability Distribution

I have no clue. I need help solving this problem: About 71% of the student generally pass the psych. class. This semester 88 students took the...

• Replies: 2
• Views: 4,108
12-11-2007, 04:39 PM
8. ### Probability comparing confidence intervals/usability designs

Note: I don't have a background in statistics, so please bear with me I am with a very small company split-running two web site designs at a time...

• Replies: 0
• Views: 3,225
12-11-2007, 07:07 AM
9. ### z and standard normal variable...

I have a question on my homework...I'm not looking for the answer, just how to find it... If Z is a standard normal variable how would you find the...

• Replies: 1
• Views: 3,350
12-10-2007, 02:49 PM
10. ### basic probability query

I have two datasets each with 18 unique records. I am using a randomising function to assign numbers from 1 to 18 for each table and then join them...

• Replies: 3
• Views: 2,852
12-10-2007, 10:27 AM
11. ### I would just like the answers so I can work backwards and know how to do it

The question is: Shutouts in the National Hockey League occur randomly and independently at a rate of 1 every 20 games. Calculate the probablity...

• Replies: 2
• Views: 4,197
12-07-2007, 12:49 PM
12. ### Probability - mean, and deviation

A scale designed so that when items are weighed, the errors in the indicated weights are normally distributed with a mean 0g and a standard deviation...

• Replies: 0
• Views: 3,586
12-06-2007, 04:07 PM
13. ### collect sales taxes on items purchased through the internet

Many states are carefully considering steps that would help them collect sales taxes on items purchased through the internet. How many randomly...

• Replies: 0
• Views: 5,481
12-06-2007, 03:58 PM
14. ### Probability

I'll give you the questions, and my answers. I'm not sure if they're right. A disease is estimated to affect 1% of the population. The sensitivity...

• Replies: 0
• Views: 2,699
12-05-2007, 11:09 PM

Find the stationary distribution for a markov chain with two states 1,2 and 0 < P11 = a < 1,0 < P22 = b < 1. Use the balance of flows to and from...

• Replies: 0
• Views: 2,766
12-04-2007, 12:47 PM
16. ### Probabilities involving sample means

I'm having trouble with this, I need help! I construe that the heights of hobbits are approximately normally distributed with mean 36 inches and...

• Replies: 0
• Views: 4,262
11-28-2007, 11:09 PM
17. ### Probability question

Scenario 8 cars use a private drive to join a local road Peak time for traffic leaving drive is 7-9am and 5-7pm Assume 4 of cars are used for...

• Replies: 0
• Views: 2,278
11-28-2007, 03:23 PM
18. ### dice probability question

I have a game that requires rolling 16 sided dice numbered 0-15. I would like to know the probability of rolling a sum of less then 20 using four...

• Replies: 0
• Views: 2,816
11-27-2007, 11:23 PM
19. ### please .. I want a help in two Q

I have a 2 problems in probability please help me to solve it :( 1\ A college have 5 math sections ,if we distribute another 4 students to...

• Replies: 0
• Views: 2,405
11-26-2007, 11:05 AM
20. ### Need help with probability

I have a problem that I DO NOT know what method to use to develop the answer here is my attempted solution, but I want affirmation from a pro. Q:...

• Replies: 1
• Views: 2,849
Rob
11-17-2007, 06:11 AM
21. ### I need help so bad (transform)

Muestre la transformacion Box-Muller: Sean U1;U2, v.a.i.i.d. (independant, identically distribuited random variables) with Ui ~ unif(0; 1) y define...

• Replies: 0
• Views: 3,303
11-16-2007, 01:23 PM
22. ### Can't figure out the correct formula

We do a lot of A/B(/C...) testing on our e-commerce sites. I'm putting together a dashboard to display the results from the testing. But I can't come...

• Replies: 1
• Views: 2,830
11-16-2007, 12:55 PM
23. ### Totally lost

I am totally lost in my intro to statistics and probability course at this point. I try to get help from my TA but he doesn't even speak english...

• Replies: 1
• Views: 2,676
11-15-2007, 10:22 PM
24. ### Combination/Permutation???

Ok here is the problem I have four m\$ms and three friends How many ways can i divide the m&ms considering i can give each friend 0, 1, 2, 3 or...

• Replies: 1
• Views: 4,263
11-15-2007, 10:15 PM
25. ### Am I right?

:confused: Here is the Question. The probablity that one of your new batch of printers will break down has been an unacceptable 0.2 each day. You...

• Replies: 1
• Views: 2,377
11-15-2007, 10:09 PM
26. ### Urgently Need Help.

I can't seem to figure this problem out. 125 employees in a company. The following probability distribution shows the likelihood that people were...

• Replies: 2
• Views: 3,330
11-15-2007, 10:43 AM
27. ### Probability of rolling a 1 10% or less over # of trials?

Hey guys, It's been years since I've taken a stats class and just need a refresher on how to calculate a problem of this form. Specifically, I'm...

• Replies: 0
• Views: 3,261
11-14-2007, 12:11 AM
28. ### There's a 70% chance this is an easier question to figure out

Hey all, I started playing this new card game, which uses 4 standard decks of cards, with jokers (total of 216 cards). Suits do not matter in...

• Replies: 2
• Views: 2,824
11-13-2007, 06:08 PM
29. ### Joint distribution question

Let X and Y be independent random variables with an exponential distribution with parameters µ and λ (note that the exponential distribution is given...

• Replies: 0
• Views: 2,833
11-09-2007, 01:40 PM
30. ### Statistics question help! Stuck!

I have a question regarding statiscs. Here is some information: A case of 600 past negligence cases showed 80% of the plantiffs were awarded...

• Replies: 0
• Views: 4,109
11-08-2007, 05:58 PM
31. ### Discrete Probability

I am not sure if I am doing this question right so I just want to verify. Viruses such as Trojan programs and worms, reach networks by requests...

• Replies: 1
• Views: 5,177
11-08-2007, 02:45 PM
32. ### Probability question-using binomial expansion

The question is: You have a special 12-sided die. You roll the die 5 times. What is the probability of getting either 2, 3, or 4 "eights" in those...

• Replies: 1
• Views: 3,802
11-08-2007, 02:26 PM
33. ### Probability Distribution

I am having difficulty solving this problem and was wondering if anyone can help me out. The manager of a soft drink bottling company believes that...

• Replies: 1
• Views: 2,876
11-08-2007, 02:18 PM
34. ### Probability question!!

How do we use z-scores to compute the probability of normally distributed, continuous variables? Does it have to do with the pearson r...

• Replies: 0
• Views: 2,625
11-07-2007, 06:11 PM

(10) The New Brew Pub manufactures and distributes three types of beers: a low-calorie light beer, a regular beer, and a dark beer. To investigate...

• Replies: 1
• Views: 3,018
11-07-2007, 07:59 AM
36. ### p-value

Can anyone tell me what a p-value of .000 means in layman terms?

• Replies: 1
• Views: 9,849
11-06-2007, 08:25 PM

So I missed last weeks lecture in Statistics, but got the homework. I thought I understood what was going on, but maybe not. Here is the problem...

• Replies: 2
• Views: 3,808
11-05-2007, 07:29 AM
38. ### Discrete Probability

Suppose that X is a normal random variable with mean 5. If P{X>9} = 0.2, approximately what is Var(X)?

• Replies: 1
• Views: 5,016
11-04-2007, 07:12 AM
39. ### Interesting Problem

Hi this is my first post on your forums so I apologize if I'm putting this in the wrong place :) This is a fairly complex, multi-aspect question...

• Replies: 0
• Views: 2,754
11-03-2007, 03:24 AM
40. ### Hurricane name contest Blows up the odds

Recently a contest was held to see if anyone could pick a couple of storms from this years Two questions were asked of the contributors: 1)...

• Replies: 3
• Views: 3,930
11-02-2007, 09:26 PM
41. ### Hello i am redoing an assignmnet which i failed and i am having the following problem

Here's my assignment: Question #1) Consider that it is well known that the probability that someone contracted chickenpox when they were young in...

• Replies: 1
• Views: 2,654
10-31-2007, 08:38 PM
42. ### Confidence Interval for N Observations?

I have a Statistics/Probability question that isn't homework, but a true life example. Some posters on another messageboard are predicting the...

• Replies: 0
• Views: 2,946
10-29-2007, 10:00 PM
43. ### non-independent RV

Hi, Let's say I have a binary experiment where the outcome has a 60% chance of being positive and a 40% chance of being negative. The outcome of...

• Replies: 0
• Views: 2,320
10-29-2007, 11:43 AM
44. ### easy peasy

Hello I was wondering if I could some help with this question. I am good at the hard stuff but it is the simple things like this which perplex me. ...

• Replies: 1
• Views: 2,563
10-29-2007, 01:13 AM
45. ### Corrected significance level in Tukey HSD post-hocs?

Dear all, I have a question that is really bugging me: I'm testing if seed set in one plant species is impacted by the deposition of pollen...

• Replies: 1
• Views: 4,116
10-28-2007, 06:31 PM
46. ### help!!! Gaussian and exponential random variable

Let Xn be independent identically distributed Gaussian random variables with mean zero and variane one. Let Yn be independent identically distributed...

• Replies: 0
• Views: 3,055
10-28-2007, 05:07 PM
47. ### sampling with replacement/central limit thereom

Hi! The question states: Suppose that you pick 16 digits at random with replacement from the set {0,1,2....9}, what is the probability that their...

• Replies: 0
• Views: 3,549
10-28-2007, 03:14 PM
48. ### central limit theorem question check?

Hi! The question states: "Suppose that, historically, one-third of the graduating seniors at a certain college have two parents who attend the...

• Replies: 0
• Views: 4,689
10-28-2007, 03:06 PM
49. ### any body help me please !!! tomorrow i ave exam but now I don't understand

any body help me Two stocks, A and B, are known to be related. The probability that stock A will go up tomorrow is 0.20 and the probability that...

• Replies: 0
• Views: 2,890
10-28-2007, 08:09 AM

Shutouts in the NHL occur randomly and independently at the rate of 1 every 20 games. A) 2 in the next 10 games B) 25 in 400 Games c) a shutout...

• Replies: 0
• Views: 2,351
10-27-2007, 11:08 PM
51. ### pemutation

how many permutations of three items can be selected from a group of six? Us the letters A, B, C, D, E, and F to identify the items, and list each...

• Replies: 0
• Views: 5,156
10-27-2007, 05:37 PM

Dear all Please help me The chancellor state university is applying for a new position. At a certain point in his application process, he is...

• Replies: 3
• Views: 3,757
10-27-2007, 03:36 AM
53. ### combinations/permutations

It's for Finite Math and we're dealing with combinations, permutations, and all that good stuff. Here we go: Suppose there are 3 U.S....

• Replies: 0
• Views: 2,704
10-26-2007, 03:29 AM
54. ### probability and binomial random variable

A state end-of-grade exam in American History is a multiple-choice test that has 50 questions with 4 answer choices for each question. A student must...

• Replies: 0
• Views: 4,052
10-24-2007, 09:44 PM
55. ### Normal distribution investment problems

I am new to this messageboard and I really need help with these two problems. Problem #1 You make an investment. Assume that returns are...

• Replies: 1
• Views: 3,475
10-24-2007, 01:01 AM
56. ### Really Easy Question

This is a basic question about probabilities, specifically what kind of test to use. I think I am close to an answer, but I am not sure. The idea...

• Replies: 0
• Views: 2,834
10-24-2007, 12:24 AM
57. ### Expected Values and Variances!

I'm an econ grad student stuck on a homework problem - I've been working on it for a couple of days now but am getting nowhere...and it's due...

• Replies: 0
• Views: 3,326
10-23-2007, 07:43 PM
58. ### Probability issue

I have a question with regard to a probability issue ; Assume a game that is played on a matrix composed of 120 squares. The game is played in 3...

• Replies: 1
• Views: 2,149
10-23-2007, 05:50 PM
59. ### conditional normal distribution

Hi all First of all, I am new here but I am not new to statistics. But I need your help:cool: I do have a multivariate normal distribution:...

• Replies: 1
• Views: 3,133
10-22-2007, 08:38 AM

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