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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: 30,178
09-30-2005, 09:44 AM
1. ### 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: 2,655
10-26-2007, 03:29 AM

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: 3,656
10-27-2007, 03:36 AM
3. ### 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: 5,102
10-27-2007, 05:37 PM

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: 2,298
10-27-2007, 11:08 PM
5. ### 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: 2,876
10-28-2007, 08:09 AM
6. ### 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: 4,643
10-28-2007, 03:06 PM
7. ### 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: 3,489
10-28-2007, 03:14 PM
8. ### 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: 3,020
10-28-2007, 05:07 PM
9. ### 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: 4,078
10-28-2007, 06:31 PM
10. ### 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: 2,515
10-29-2007, 01:13 AM
11. ### 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: 2,279
10-29-2007, 11:43 AM
12. ### 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: 2,904
10-29-2007, 10:00 PM
13. ### 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: 2,638
10-31-2007, 08:38 PM
14. ### 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: 3,813
11-02-2007, 09:26 PM
15. ### 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: 2,725
11-03-2007, 03:24 AM
16. ### 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: 4,940
11-04-2007, 07:12 AM

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: 3,737
11-05-2007, 07:29 AM
18. ### p-value

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

• Replies: 1
• Views: 9,732
11-06-2007, 08:25 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: 2,964
11-07-2007, 07:59 AM
20. ### 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: 2,588
11-07-2007, 06:11 PM
21. ### 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: 2,846
11-08-2007, 02:18 PM
22. ### 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: 3,744
11-08-2007, 02:26 PM
23. ### 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: 5,113
11-08-2007, 02:45 PM
24. ### 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: 4,046
11-08-2007, 05:58 PM
25. ### 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: 2,782
11-09-2007, 01:40 PM
26. ### 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: 2,786
11-13-2007, 06:08 PM
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: 3,158
11-14-2007, 12:11 AM
28. ### 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: 3,286
11-15-2007, 10:43 AM
29. ### 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: 2,360
11-15-2007, 10:09 PM
30. ### 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: 4,203
11-15-2007, 10:15 PM
31. ### 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: 2,639
11-15-2007, 10:22 PM
32. ### 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: 2,802
11-16-2007, 12:55 PM
33. ### 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: 3,252
11-16-2007, 01:23 PM
34. ### 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: 2,788
Rob
11-17-2007, 06:11 AM
35. ### 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: 2,372
11-26-2007, 11:05 AM
36. ### 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: 2,766
11-27-2007, 11:23 PM
37. ### 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: 2,267
11-28-2007, 03:23 PM
38. ### 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: 4,198
11-28-2007, 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: 2,710
12-04-2007, 12:47 PM
40. ### 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: 2,602
12-05-2007, 11:09 PM
41. ### 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: 5,396
12-06-2007, 03:58 PM
42. ### 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: 3,536
12-06-2007, 04:07 PM
43. ### 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: 4,136
12-07-2007, 12:49 PM
44. ### 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: 2,802
12-10-2007, 10:27 AM
45. ### 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: 3,286
12-10-2007, 02:49 PM
46. ### 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: 3,171
12-11-2007, 07:07 AM
47. ### 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: 4,008
12-11-2007, 04:39 PM
48. ### !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: 3,210
12-11-2007, 04:49 PM
49. ### simple combinatorics problem

this problem has been solved, please delete this post

• Replies: 0
• Views: 2,708
12-12-2007, 11:27 PM
50. ### 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: 2,769
12-13-2007, 07:16 AM
51. ### 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: 2,378
12-13-2007, 11:39 AM
52. ### 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: 3,917
12-14-2007, 10:58 AM
53. ### 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: 3,208
12-14-2007, 07:45 PM
54. ### Mutual Information and Probability

Hi, This is my first post in this forum :) I have some knowledge on statistics and probability but im stuck on a experiment im doing. ...

• Replies: 0
• Views: 4,246
12-17-2007, 02:03 PM
55. ### Probability / Conditional Prob.

Above is the question I'm trying to figure out.... I'm not sure if I'm correct, but attempting the problems results in: a. P<38 = .92 b....

• Replies: 0
• Views: 2,902
12-18-2007, 08:21 PM
56. ### Scrabble probability question?

I have a question for you probability and statistics experts out there. At the beginning of scrabble to determine who starts, each person (in this...

• Replies: 4
• Views: 9,105
12-21-2007, 04:22 PM
57. ### Inverse gamma distributions & simulated annealing

I've hit a problem trying to sample an inverse gamma distribution, 'scaled' using a temperature variable, T. If my distribution is defined as (where...

• Replies: 0
• Views: 2,818
12-24-2007, 07:16 AM
58. ### really stuck

:( hello all. I am really struggling with analysing my data which i have collected for my report. I am using a 2 x 2 mixed ANOVA and i am not sure...

• Replies: 0
• Views: 2,451
12-26-2007, 05:14 PM
59. ### binomial distribution

A "thinking" question I need help with regarding binomial distributions and I have no clue what they mean. Please help!! I can do the problems O.K....

• Replies: 0
• Views: 3,780
12-29-2007, 10:36 PM

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