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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: 31,090
09-30-2005, 09:44 AM
1. ### Mutual independence -> Conditional independence ?

hi, all! I have the following question about relations between conditional independence and mutual independence: Does Mutual independence imply...

• Replies: 1
• Views: 2,518
05-07-2012, 09:31 AM
2. ### Probability involving stock market help pls

Stock A and stock B. Every day the price of stock A will either increase by 1 dollar with probability 0.6 or decrease by one dollar with...

• Replies: 0
• Views: 3,741
04-19-2006, 04:59 PM
3. ### homework help!

any1 who can do as much of this as possible!?? 6.Assuming that the following sample of 12 numbers arise from a Normal distribution with mean ...

• Replies: 1
• Views: 2,956
04-01-2011, 09:02 AM
4. ### Probability problem

Hello everyone, I don't know how to calculate a probability, relating a lotto game. The problem is: if I choose 10 random numbers in a 6/49 game,...

• Replies: 0
• Views: 5,527
06-23-2008, 09:10 AM
5. ### Which Formula do I Need?

Hi, I've been scouring the internet for answers but I have very little knowledge when it comes to probability so I need help. I have 10 trials,...

• Replies: 2
• Views: 1,555
11-11-2015, 04:27 AM
6. ### Probability of queuing

We are students and we developing the project of a music festival that takes place in 3 venues. We have identified some risks; one of those is...

• Replies: 2
• Views: 1,835
06-06-2013, 11:31 AM
7. ### Normal Distribution question

Can someone help me out with this, Based on a population that is normally distributed, with a population mean of \$470 and a population standard...

• Replies: 2
• Views: 3,559
11-17-2010, 08:05 PM
8. ### Help with some homework

I got the following question for homework, We know that 27% of the homes in Cleanville have a central vacuum system. We are going to randomly...

• Replies: 1
• Views: 1,678
11-20-2010, 06:53 PM
9. ### Bayes Probability question

Question: Yearly automobile inspections are required for residents of the state of Pennsylvania. Suppose that 18% of all inspected cars in...

• Replies: 0
• Views: 2,712
10-19-2014, 04:57 AM
10. ### selecting randomly from a sample

Hi, I have a sample of 400 observations. if I want to select randomly 100 out of the 400. could I have 5000 different combinations of the elements...

• Replies: 2
• Views: 2,468
10-06-2006, 12:40 AM
11. ### kurtosis

Hi, I am calculating the skewness of returns of 10,000 randomly selected portfolios with different portfolio sizes(where assets range from 2 to...

• Replies: 2
• Views: 5,112
11-17-2006, 09:47 PM
12. ### Kurtosis Central limit vs No central limit

Hi, I am discovering that certain softwares report different measures for kurtosis. Mainly the central limit kurtosis and non central limit...

• Replies: 0
• Views: 3,206
11-25-2006, 11:35 AM
13. ### Game Theory Exercise! Help???

Consider the following guessing game. There are 100 participants, and each participant announces independently and simultaneously a number between 0...

• Replies: 3
• Views: 3,730
08-24-2012, 04:50 PM
14. ### Statistical significance for discrete data?

I'm getting myself in a muddle and hoping someone can help! I am analysing a discrete data set - I am comparing my control and experimental group,...

• Replies: 0
• Views: 2,569
08-09-2008, 09:28 AM
15. ### Computing pobabilities for any normal probability Dist.

Greetings all, I am a math challenged individual in the middle of a stats class and (you've heard it before) seriously struggling with story...

• Replies: 2
• Views: 4,971
10-14-2012, 03:23 PM
16. ### Probability: 10 true/false questions, probability at least 7 are correct

An instructor gives a quiz involving 10 true-questions. To test the hypothesis that he student is guessing, the following rule is adopted: a) If 7...

• Replies: 1
• Views: 3,183
04-25-2013, 02:07 AM
17. ### Expected Value calculation

I have 2 random variables U and V uniformly distributed on . Their joint cumulative distribution function F(u, v) = min (u,v) on x . Therefore I...

• Replies: 9
• Views: 4,105
06-07-2011, 04:17 PM
18. ### Equation involving uniformly distributed variable

Let U be a random variable uniformly distributed on , and let X be a dependent variable such that X^U = a for some number a (X^U means X to the power...

• Replies: 5
• Views: 3,170
BGM
03-31-2011, 02:29 PM
19. ### Using Taylor expansion for calculating Expected Value

Hello, This question is motivated by a very helpful approach suggested by BGM for solving an expected value estimation problem recently posted on...

• Replies: 1
• Views: 11,456
BGM
04-04-2011, 02:15 PM
20. ### "Bridging" uniform and "mass" distributions

My goal is to find a family X(a, b) of random variables (continuously) depending on two non-negative parameters a and b . The family should have the...

• Replies: 2
• Views: 2,293
04-26-2011, 11:22 AM
21. ### Probability Distribution Function

Hi Every one. Can any one help me to start solving this problem?i am stocked in the beginning. The range of a ballistic projectile is given by ...

• Replies: 6
• Views: 2,202
03-15-2012, 03:49 AM
22. ### Quick Population / Media Prob question

This is hopefully a fairly quick conditional probability question for you guys. Imagine a total population of 22MM people and I am running a...

• Replies: 0
• Views: 1,213
01-10-2016, 12:47 PM
23. ### Probability Distributions

Hi, I understand all the fuss about normal distribution. a lot of real life events and their probability of occurence follow a normal...

• Replies: 3
• Views: 1,766
02-06-2013, 12:36 PM
24. ### Poisson

I just took an exam and not sure if I botched up on the Poisson concept which was asked several times. Possion (e^-lambda*lambda^X/X!) .5...

• Replies: 1
• Views: 2,498
10-19-2006, 06:57 AM
25. ### 4th Super Bowl Victory

When the NY Giants won Super Bowl XLII it was their 3rd Super Bowl victory AND it was also the third time that I created a NY Giants billboard in...

• Replies: 0
• Views: 2,416
03-05-2008, 02:06 PM
26. ### Payoff table probabilities

Hello guys, I have an assignment and I am royally stuck and don't have a clue how to begin. Any sort of help would be greatly appreciated (no need to...

• Replies: 0
• Views: 2,571
01-31-2014, 09:09 PM
27. ### Simple Problem

In a game, you: - Win 70 in scenario 1 - Win 4 in scenario 2 - Lose 20 in scenario3 - Lose 80 in scenario 4 For it to be a fair game, what...

• Replies: 1
• Views: 1,070
05-20-2017, 04:20 AM
28. ### need help with statistics

1. The problem statement, all variables and given/known data the weight of items produced by a production line is normally distributed with a mean...

• Replies: 2
• Views: 3,190
08-13-2010, 03:19 PM
29. ### probability, independent or dependent

Hello. I roll a dice twice. Let's say that A = odd number on first, B = even number on second, C = sum is odd. Now, I need to calculate P(A),...

• Replies: 7
• Views: 3,330
10-10-2011, 09:56 AM
30. ### Three shooters, probability that two of them hits

I have a little problem. There are three shooters ( i= 1,2,3) and they hit the target with probabilities P(A1) = 1/2, P(B1) = 2/3, P(A3) = 3/4....

• Replies: 14
• Views: 5,485
10-24-2011, 01:18 AM
31. ### What type of sampling is this....`

First of all sorry if this is in the wrong section but i think is the section that applies most! I want to distrubute questionaires to five groups...

• Replies: 5
• Views: 3,014
03-08-2011, 11:23 PM
32. ### summing two probability density functions---Gompertz hazard model?

Hi, r-help members. I have a question about summing two density distributions. I have two samples from which I've estimated hazard parameters for...

• Replies: 0
• Views: 3,393
04-23-2012, 04:44 PM
33. ### Challenging probability question (expectation of iterative uniform integer)

" You start with a number x_0. Let R(x_s) be a random integer drawn uniformly from {0,...,x_s-1}. We now play a game where we draw x_1=R(x_0). If...

• Replies: 4
• Views: 1,721
11-10-2012, 05:59 PM
34. ### The Old Coin Toss Question

Helppppp meeee! AH. :wave: John flips a fair, two-sided coin 5 times. a. What is the probability that he flips 4 heads? ...

• Replies: 2
• Views: 3,553
02-23-2011, 06:18 AM
35. ### Probability Proportion Question

Hello I am having a bit of difficulty understanding how to go about this question. A very large airline claims that 90% of their flight departures...

• Replies: 1
• Views: 1,687
12-18-2013, 12:22 AM
36. ### Propability with variable

Hi , I need help with my statistics homework. I'm not realy good at statistics :shakehead more green. So will be very great to get some help.;)

• Replies: 5
• Views: 2,876
11-03-2010, 03:09 PM
37. ### How to get this number?

a) Variant P(x=0)=P(0,0)+P(0,1)+P(0,2)=0.27 P(x=1)=P(1,0)+P(1,1)+P(1,2)=0,4 P(x=2)=P(2,0)+P(2,1)+P(2,2)=0.33 expected value ( I do not know how...

• Replies: 13
• Views: 3,777
11-24-2010, 12:16 PM
38. ### Probability question

I need a probability question answering as soon as possible and i though this might be the place to come. There are 13 balls in a hat being...

• Replies: 5
• Views: 2,035
03-02-2014, 11:36 PM
39. ### 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: 4,828
04-16-2008, 11:04 PM
40. ### Bayes' Theorem

Hi guys, I was hoping somebody might be able to help me with this question. The information I am given: Gamma1 = the risk of disease for...

• Replies: 0
• Views: 2,836
03-20-2008, 07:34 AM

Let say if player A scores an average of 3 points per game, and he has played a tons of games already. What fraction of his games will be exactly...

• Replies: 3
• Views: 2,588
10-09-2006, 10:13 AM
42. ### Probablity Question!! HELP PLEASE~~

Suppose that (X, Y) is uniformly distributed over the region defined by 0<y<1-x^2 and -1<x<1, find the joint density.

• Replies: 1
• Views: 2,634
10-10-2006, 11:41 PM

ignore this, I have solved the problem

• Replies: 1
• Views: 2,315
11-21-2006, 12:41 AM
44. ### Birthday problem

ignore this, I have solved the problem

• Replies: 0
• Views: 2,608
11-25-2006, 12:52 AM
45. ### household selection probabilities for household surveys

Hi, we are starting a survey with 2 stage cluster sampling approach. At first stage we select a fixed number of clusters from total population...

• Replies: 0
• Views: 3,798
06-04-2010, 01:07 AM
46. ### probability

Hi My name is Angela. Can anyone help me figure out how to do this problem. I don't know where to begin. An automobile has three factories. A, B,...

• Replies: 1
• Views: 2,539
06-05-2008, 11:49 PM
47. ### Help please.... Find the expectation of the game

Hi my name is Angela. Can anyone help me with this problem please..... For \$4 a person may buy a chance at a raffle. There are 2000 tickets sold....

• Replies: 1
• Views: 2,605
06-05-2008, 11:59 PM
48. ### Point me in the right direction on a game probability

This is my third time typing this grrrr. Let's hope my login holds this time. I have written a dice game for the computer and now I am trying to...

• Replies: 3
• Views: 2,049
06-30-2012, 07:52 PM
49. ### Permutations involving additional chances

I am attempting to calculate the probabilities of a simple dice game. I have actually calculated the perfect score, and the additional permutations...

• Replies: 6
• Views: 2,941
01-13-2014, 09:44 AM
50. ### Central Limit Theory?

Hi everyone! Here's my problem: In a large population, 12.5% of all individuals have diabetes. (a) Seven of these individuals are sampled at...

• Replies: 7
• Views: 4,044
11-28-2005, 11:35 PM
51. ### Employee commuting question

It takes an average weekday commute of 39 minutes with a Standard Deviation of 7 minutes for the employees to get to work when they use their...

• Replies: 1
• Views: 1,728
12-22-2015, 10:35 AM
52. ### Null and alternate hypothesis

Hi- I have a problem that begins, "Suppose you wish to test the null hypthesis that u=50 vs the alternate hypothesis that u<50...."and then it goes...

• Replies: 1
• Views: 2,954
10-15-2008, 09:49 PM
53. ### true hypothesis and errors??

Ok...so i have a sample problem that asks to describe the circumstances under which a researcher would make a Type I and or Type II error in the...

• Replies: 2
• Views: 1,681
10-19-2008, 07:26 AM
54. ### one or two tailed?

Ok, so i know when testing to determine if say a drug umproves some fuction, the null and alternate hypothesis would not be two tailed. But, if im...

• Replies: 1
• Views: 2,750
10-26-2008, 10:43 AM
55. ### Game Probability

Hi All - I have not looked at statistics or probability for a number of years but am wondering if someone can provide me with a formula for figuring...

• Replies: 4
• Views: 4,382
07-14-2010, 12:26 PM
56. ### Exponential likelihood ratio test help

Hello all, I am trying to get a grasp of likelihood ratio tests. Can any one help me with the following problem? Exponential likelihood ratio...

• Replies: 1
• Views: 3,072
BGM
04-22-2012, 03:12 PM
57. ### A probability question

Dear all This may be simple for you guys but I would be grateful for some advice on the following: A bus stop layby is only long enough for 2...

• Replies: 5
• Views: 1,642
BGM
04-09-2014, 07:50 AM
58. ### one question

well, I did post this in another forum, but I just realized I probably should have posted it here. I've just been having trouble with this one...

• Replies: 1
• Views: 2,571
04-04-2006, 02:24 PM

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