1. Announcement:
05-10-2017
Views:
1,776
Page 1 of 91 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 51 ... Last
Threads 1 to 60 of 5449

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: 30,181
09-30-2005, 09:44 AM
1. Homework Help! Axioms of Probability

Hi, so I've been stuck on three problems after multiple submissions and still cannot get it right! Can someone help and mind explaining? The bolded...

• Replies: 0
• Views: 3,247
03-05-2014, 08:05 PM
2. from Uniform random variable to Logistic

Given U~Unif(0,1) and X=s*ln(U/(1-U)), where s>0 is a parameter, I am hoping to get F(x), where F(x) would turn out to be a logistic cdf F(x) =...

• Replies: 4
• Views: 2,868
10-08-2010, 12:21 AM
3. y follows a Poisson distribution with rate lambda*x

Assume that the number of faults in the roll, say y, follows a Poisson distribution with rate lambda*x, where x is the length of the roll. Does this...

• Replies: 4
• Views: 6,339
12-05-2010, 05:27 PM
4. empirical distribution

Let (x1, …, xn) be iid random variables with the common cdf F(x). The empirical distribution is defined as F_n(x) = P_{Fn}(X<x) = \frac{1}{n}...

• Replies: 1
• Views: 3,443
02-04-2011, 03:09 PM
5. red/white balls, distinct values X1,...,Xn

There are (2n-1) choose (n-1) ways that n-1 red balls can be put in a line with n white balls. Can someone explain why? Thanks.

• Replies: 1
• Views: 2,428
02-04-2011, 03:03 PM

I was wondering if anyone new how to calculate the odds of Quads beating Quads in a texas holdem game. Assuming their were no bets to make folders. ...

• Replies: 0
• Views: 2,608
04-09-2008, 01:09 AM
7. counting probability

i need some help counting probability using Bayes theorem given that 1/10 of message is a spam message. spam detector will correct identify a...

• Replies: 5
• Views: 2,081
07-28-2013, 09:27 AM
8. Questions need help!!

Weekly demand for packs of a certain make of chocolate trifle at a major supermarket store has a Normal distribution with mean of 200 and standard...

• Replies: 0
• Views: 2,242
11-07-2008, 07:03 AM
9. Which sampling type to use?

What kind of sampling do researchers use to estimate population parameters on individual data? a. population sampling b.nonprobability sampling...

• Replies: 1
• Views: 1,660
05-01-2012, 09:36 PM
10. Probability problem help

I need help with 2 quizes: first: ...

• Replies: 1
• Views: 1,865
02-05-2017, 12:59 PM
11. Density function?

Please can you help me solve this the pdf of continues r.v. X where f(x) {(2x 0≤x≤1 0 elsewhere} 1)...

• Replies: 4
• Views: 3,158
10-05-2009, 04:09 PM
12. Joint density

Am a software engineer, and not know much about statsitics but have to explain my younger brother, please help me with this, thanks X1 and X2 have...

• Replies: 2
• Views: 3,630
10-05-2009, 02:59 AM
13. Plz help on this question?

My younger brother asked me and am stuck? Question: Find the probability that exactly four observations of a random sample of size 5 from the...

• Replies: 1
• Views: 2,096
BGM
10-04-2009, 04:37 AM
14. Rick Durrett definition of markov property

Dear forumers This is my first post - I hope this is the right place for the post and that this forum covers these kind of questions. I have...

• Replies: 0
• Views: 1,842
03-23-2012, 01:52 PM
15. probability of exceedence

Hi all, I'm new here, but I have a problem I can't figure out. I have wave height data from the past 13 years and I fitted the data with a...

• Replies: 0
• Views: 3,088
07-07-2008, 09:42 AM
16. Dice and Don't Cares

Hi. I'm working on deriving a probability formula to help in some research I'm doing, but I've hit a wall. I've managed to reduce my problem down...

• Replies: 3
• Views: 1,940
BGM
10-17-2011, 08:19 AM
17. Estimate P(F and M) by P(F), P(M)

Hi guys: I need help from stats experts. First of all I'm working in market research and no longer a student anymore. What I have are projects...

• Replies: 2
• Views: 2,539
06-13-2008, 09:34 PM

Hi, in my homework, I am stuck on a three part question. I have managed to do the first part of the question but can't understand how to do the...

• Replies: 3
• Views: 2,454
BGM
12-22-2010, 12:24 PM
19. probability for "identity"

In a new show on tv, a contestant has to guess the identity of 12 strangers. To win the grand prize the contestant has to guess all twelve. I...

• Replies: 2
• Views: 1,876
12-21-2006, 06:33 PM
20. Probably of success for 3 mutually exclusive events

I have been removed from the details of this since college over 20 years ago... Here is my question... For event A, probability of success is 30%...

• Replies: 5
• Views: 3,504
05-17-2011, 12:56 PM
21. Gamma Distribution and data fitting

I have a problem with data fitting to gamma distribution. I have rainfall occurrences (calculated using 1st order 2 states Markov Chain analysis) for...

• Replies: 0
• Views: 1,736
10-07-2013, 12:13 AM
22. help with some question

hi there are some questions i was unable to solve. i will describe them and say where exactly my problem is. 1. a fair cube (with six surfaces) is...

• Replies: 2
• Views: 2,357
BGM
12-30-2009, 04:16 AM
23. predictions

hi, when i am asked to give a prediction about X in which cases i use what: 1. most probable x 2. e(x) 3.e(x|y) 4. x=ay+b thanks

• Replies: 1
• Views: 2,727
01-01-2010, 07:28 PM
24. ex(xy)

Hi, i can't figure out how do i calculate e(xy) in cases they are not independent and lets say they have the same distribution, for instant...

• Replies: 1
• Views: 11,265
01-08-2010, 08:36 AM
25. problem with convergance of probability

hi, this is a simple on but some how i get a result different from what the professor got. i guess i am wrong but i dont know why. i need to find...

• Replies: 3
• Views: 2,764
01-24-2010, 04:19 AM
26. best forecast

hi, i have been solving this question and my result is different than the results i have been given to compare to. can u please tell me if i am...

• Replies: 1
• Views: 3,208
BGM
01-27-2010, 08:53 AM
27. variable dependency check

hi, i am a bit confused. i know how to check if two variables are not correlated. but how do i check they are independent? for instance i have...

• Replies: 0
• Views: 2,411
01-24-2010, 04:32 AM
28. forecast and fine

hi, am i solving it right? a coin is flipped twice with probability of 2/3 for heads. you are supposed to forecast the number of heads with fine...

• Replies: 1
• Views: 2,810
01-24-2010, 02:07 PM
29. even and odd probability of coin

hi, i am preparing for an exam and i wondered if some one could show me explicitly how to calculate the probability of getting an even number of...

• Replies: 1
• Views: 5,272
BGM
01-24-2010, 08:02 AM
30. correlation coefficient

hi another exam preparation question: let x1..xn be random varibale independent and with same dist. they have exp. u and variance v. let m be a...

• Replies: 2
• Views: 5,294
01-24-2010, 07:49 AM
31. Problem of a biased coin

Hi! I am having problems to solve the subsequent probability problem: A person has a biased coin. It was fabricated in a way that there is more...

• Replies: 1
• Views: 3,383
BGM
06-21-2011, 09:07 AM
32. Who can solve this probability problem?

Hi all, We have a population of people (denoted by S=30000). Assume that we want to divide this population into groups (denoted by D) consisting...

• Replies: 0
• Views: 1,284
10-29-2013, 04:26 PM
33. precision of two independent classifiers

Consider two classifiers A and B giving binary labels to a big set of candidates, say, we have a million cats and a million dogs for labeling. Assume...

• Replies: 0
• Views: 1,207
12-29-2014, 10:12 AM
34. 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: 6,796
01-18-2008, 03:59 PM
35. 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: 4,554
01-18-2008, 02:40 PM
36. 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: 4,512
09-28-2010, 11:39 PM
37. Probability question in section involving conditonal probability

With probability of 1/6 there are i defective fuses among 1000 fuses (i = 0, 1, 2, 3, 4, 5). If among 100 fuses selected at random, none was...

• Replies: 1
• Views: 6,973
BGM
10-07-2010, 10:42 AM
38. help for task in R programming language

This is my task. I don't know how to solve it in R studio. Please help me!!! Simulate: a) 15 values from N(0,1) distribution b) 50 values from...

• Replies: 4
• Views: 2,876
11-28-2011, 12:35 PM
39. Need help

hey guys, I found this forum using google. and I really hope you guys can help me. This is the question: Every box of a smartphone has a coupon...

• Replies: 4
• Views: 1,575
01-03-2014, 03:16 PM
40. Networking probability theory; packet length, time of transmission, etc; need help

Assume that an application sends packets over a communication link with a capacity of C bits per second, i.e. when the packet is l0 bits long, then...

• Replies: 2
• Views: 1,880
BGM
01-25-2013, 11:17 PM
41. Vehicles accident probability

Hi, I would like to know the probability of Vehicles accident in a street. Which kind of probability distribution should I use? Please Help me :)...

• Replies: 2
• Views: 1,823
08-02-2016, 05:58 PM
42. Equal probability in each direction

"A drunk is standing on the sidewalk 40 steps from home and 30 steps from the nearest bar. He takes a step towards home or a step towards the bar...

• Replies: 3
• Views: 3,726
12-04-2008, 01:44 PM
43. Basic probability

Whilst I've done pg stats (like 30+ years ago) and still use them a bit, I'm now wishing to look more closely at the basis of probability. With that...

• Replies: 0
• Views: 2,370
07-18-2011, 11:48 AM
44. Probability Question. Help!

I have two questions that I'm stuck on: Question #1: Assume you have applied for two scholarships, scholarship A and scholarship B. The...

• Replies: 1
• Views: 1,146
07-22-2012, 08:21 PM
45. Bayes Rule!

Hi, My question is: A company wishes to evaluate the effectiveness of a marketing campaign. Seventy-five percent of all customers using the...

• Replies: 1
• Views: 2,730
01-09-2017, 08:22 PM
46. Help - Normal Distribution Problem

Dear readers, I am puzzled by the following Normal Distribution equation:- f(x) = 1/sqrt(2*pi*variance) * e^ (-/(2*variance)) Correct me if...

• Replies: 2
• Views: 1,683
02-07-2012, 01:34 PM
47. Mann Whitney vs Kolmogrov-Smirnov Z ?

Hi forum, I'm brand new here. :wave: I'm working on my master's thesis in behavioral finance. I'm trying to ascertain whether temperature has an...

• Replies: 2
• Views: 1,947
03-17-2012, 05:21 PM
48. Calculating probability of the expected number of runs needed

Hello, I'm working on a personal project but I've hit a bit of a wall in working out an equation. I'd like to find the probability of a result given...

• Replies: 6
• Views: 1,823
09-28-2015, 02:25 PM
49. Stuck on this

The probability of an event happening is 20%. How many times would you have to do this to get an 80% chance of it happening at least 3 times?

• Replies: 5
• Views: 2,265
06-26-2011, 09:03 PM
50. Probability of Independent Events

Hi, If hypothetical events A and B are independent, with P(B/A)=.4, and P(A)=.3 What is the P(B)? What formula would you use to figure this...

• Replies: 9
• Views: 2,375
08-05-2012, 12:39 PM
51. Poisson Question

Got a question here about an antenna designed to withstand 50mph wind ( 20m abover ground) the 50mph wind occurs once every 30 years on average. What...

• Replies: 5
• Views: 2,678
01-10-2010, 03:50 PM
52. binomial distribution

If every person tossed a coin 5 times, what is the probability of observing 5 tails if there are 1000 people? i can work out the answer if only...

• Replies: 1
• Views: 2,899
01-10-2010, 03:49 PM
53. Kruskal Walis & Wilcoxon test

Hi all, it would be so kind if someone could explain to me as to why both equations, Kruskal Walis and Wilcoxon, consists of the number 12? The...

• Replies: 1
• Views: 545
08-11-2017, 02:01 PM
54. Help with these probability problems

1. Conditional Prob: Approximately 1/125 of all births are fraternal twins and 1/300 of births are identical twins. Elvis Presley had a twin brother...

• Replies: 1
• Views: 6,299
01-13-2007, 12:58 PM
55. regression choice

I made survey for my master tesis. And it is a problem now to choose the method to analyse the model. I can use buying probability after event or...

• Replies: 3
• Views: 1,672
02-19-2013, 04:39 PM
56. prob. questions

Let we have 3 urns with a white, b black balls in each urn. We choose one ball from urn 1 and transform it to urn 2. Then, choose one ball from urn 2...

• Replies: 5
• Views: 2,914
10-20-2010, 05:01 PM

Page 1 of 91 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 51 ... Last

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.

Icon Legend

You have posted in this thread

Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts