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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: 30,349
09-30-2005, 09:44 AM
1. ### 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: 1,964
03-17-2012, 05:21 PM
2. ### 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: 1,712
02-07-2012, 01:34 PM
3. ### 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: 2,781
01-09-2017, 08:22 PM
4. ### 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: 1,165
07-22-2012, 08:21 PM
5. ### 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: 2,392
07-18-2011, 11:48 AM
6. ### 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: 3,779
12-04-2008, 01:44 PM
7. ### 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: 1,845
08-02-2016, 05:58 PM
8. ### 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: 1,908
BGM
01-25-2013, 11:17 PM
9. ### 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: 1,609
01-03-2014, 03:16 PM
10. ### 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: 2,928
11-28-2011, 12:35 PM
11. ### 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: 4,549
09-28-2010, 11:39 PM
12. ### 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: 7,035
BGM
10-07-2010, 10:42 AM
13. ### 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: 6,860
01-18-2008, 03:59 PM
14. ### 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: 4,581
01-18-2008, 02:40 PM
15. ### 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: 1,223
12-29-2014, 10:12 AM
16. ### 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: 1,301
10-29-2013, 04:26 PM
17. ### 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: 3,417
BGM
06-21-2011, 09:07 AM
18. ### 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: 2,374
BGM
12-30-2009, 04:16 AM
19. ### 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: 2,751
01-01-2010, 07:28 PM
20. ### 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: 11,334
01-08-2010, 08:36 AM
21. ### 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: 2,810
01-24-2010, 04:19 AM
22. ### 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: 3,242
BGM
01-27-2010, 08:53 AM
23. ### 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: 2,444
01-24-2010, 04:32 AM
24. ### 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: 2,838
01-24-2010, 02:07 PM
25. ### 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: 5,324
BGM
01-24-2010, 08:02 AM
26. ### 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: 5,346
01-24-2010, 07:49 AM
27. ### 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: 1,762
10-07-2013, 12:13 AM
28. ### 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: 3,552
05-17-2011, 12:56 PM
29. ### 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: 1,895
12-21-2006, 06:33 PM
30. ### Normal Distribution Help Please

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: 2,479
BGM
12-22-2010, 12:24 PM
31. ### 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: 2,580
06-13-2008, 09:34 PM
32. ### 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: 1,973
BGM
10-17-2011, 08:19 AM
33. ### 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: 3,119
07-07-2008, 09:42 AM
34. ### 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: 1,854
03-23-2012, 01:52 PM
35. ### 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: 2,121
BGM
10-04-2009, 04:37 AM
36. ### 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: 3,190
10-05-2009, 04:09 PM
37. ### 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: 3,678
10-05-2009, 02:59 AM
38. ### Probability problem help

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

• Replies: 1
• Views: 1,904
02-05-2017, 12:59 PM
39. ### 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: 1,686
05-01-2012, 09:36 PM
40. ### 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: 2,262
11-07-2008, 07:03 AM
41. ### 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: 2,099
07-28-2013, 09:27 AM

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: 2,638
04-09-2008, 01:09 AM
43. ### 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: 2,896
10-08-2010, 12:21 AM
44. ### 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: 6,394
12-05-2010, 05:27 PM
45. ### 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: 3,477
02-04-2011, 03:09 PM
46. ### 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: 2,460
02-04-2011, 03:03 PM
47. ### 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: 3,295
03-05-2014, 08:05 PM

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