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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: 30,299
09-30-2005, 09:44 AM
1. ### can someone solve this ?!

find values of a b and c

• Replies: 2
• Views: 1,757
12-22-2012, 10:49 PM
2. ### Basic probability question

f(x) = x/4 for 0<x<2 = 1- x/4 for 2<x<4 = 0 otherwise Find c1 and c2 such that probability of (c1<x<c2)=0.6 So I tried to plot the...

• Replies: 3
• Views: 1,815
BGM
10-15-2011, 03:27 AM
3. ### Homework problem, help me!

Circuit boards are produced by a machine. Each board may turn out to be defective (Outcome D) with probability 0.1, good (Outcome D') with...

• Replies: 4
• Views: 4,637
06-20-2012, 06:10 AM
4. ### Help help null and alternative hypotheses

Null and Alternative Hypotheses -------------------------------------------------------------------------------- I have researched the site...

• Replies: 2
• Views: 3,113
01-29-2008, 09:57 PM

I posted the entire question earlier in the thread and I would greatly appreciate it if someone would help me and show me how to do the problem step...

• Replies: 0
• Views: 1,800
09-17-2007, 11:38 PM

I have been working on this for 2 weeks and I really need help guys! I see everyone has read my stuff but nobody has posted anything. I have used the...

• Replies: 0
• Views: 2,601
09-19-2007, 04:41 PM
7. ### Percentage/zscore

What percentage of drivers drive over 72 mph? I know I have to convert 72 into a Z-score. Im not sure if thats the answer or more to it?

• Replies: 1
• Views: 1,474
09-17-2013, 10:54 AM
8. ### Help with normal approximation to the binomial distribution

Hi all, I need help with a question I have for class. The question is: The the normal approximation to the binomial distribution to estimate the...

• Replies: 2
• Views: 2,606
03-14-2012, 02:52 AM
9. ### Help with Probability!

Hi. I came across a few questions tht i came across while studyin for a probability chapter. Just a little request, im very new to probability so u...

• Replies: 5
• Views: 19,009
12-09-2010, 10:41 AM
10. ### Probability Homework(2)

The deeper i go into the probability chapter, the more confused i get :(, here are sum questions. they might be really easy but i'm not getting them....

• Replies: 9
• Views: 16,892
02-24-2012, 11:19 PM
11. ### Probability on a normal curve

Hey all - It's been a long time since I was in school looking at probability and statistics. i have a bit of a difficult question for me. I have...

• Replies: 10
• Views: 1,630
06-07-2013, 01:47 PM
12. ### Bejeweled Combos

Hi all, Many of you I assume are familiar with Bejeweled, a puzzle game in which the player swaps neighboring, colored gems in an 8 x 8 grid to...

• Replies: 2
• Views: 4,063
07-16-2010, 12:08 PM
13. ### Need Help on Probability Probs.

:confused: I'm having trouble with some problems: 1) Suppose that in a family, the probability of a child having black hair is .45, the...

• Replies: 7
• Views: 3,141
02-09-2008, 11:27 AM
14. ### Rotated Ellipses

Hi all, I've been thinking about this problem for a while, and I haven't been able to find a good starting point. This may be more of a...

• Replies: 0
• Views: 2,489
07-28-2010, 09:49 AM
15. ### I Need Help Fast

I HAVE AN EXAM ON WEDNESDAY AND CANNOT FIGURE OUT THESE TWO PROBLEMS FOR THE LIFE OF ME. IS THERE ANY WAY SOMEONE CAN TELL ME HOW TO DO THEM! 1. A...

• Replies: 7
• Views: 3,282
ssd
12-13-2006, 06:26 AM
16. ### Probably a simple problem

This is a long question, so I'll put it in quotes. Sorry for the lame title, but I wasn't sure what else to call it. It's essentially a very basic...

• Replies: 2
• Views: 2,190
07-23-2013, 02:03 AM
17. ### Probabilty : Round permutation problem

A garland is to be formed with five roses and five dahlias. If they are arranged randomly, find the probability of roses and dahlias being arranged...

• Replies: 5
• Views: 4,840
03-14-2011, 09:53 AM
18. ### In how many ways can 14 be rolled using 4, 6 sided dice?

Hello, I am stuck in trying to figure out a possible number of permutations in which a certain sum of all dices rolled can be reached. For...

• Replies: 3
• Views: 6,120
03-02-2012, 10:59 PM
19. ### I need help with these problems,

Hey everyone, I am new at this forum. I need help with these problem... I hope you can provide me with full solution and steps please...

• Replies: 1
• Views: 6,113
02-26-2006, 10:34 PM
20. ### help please

You are doing an industry analysis of the Bloomington pizza industry. The rate (per year) at which pizza restaurants enter the industry is given by...

• Replies: 0
• Views: 3,743
02-28-2006, 12:09 PM
21. ### random variable x

Consider a continuous random variable X with the density function (called the exponential density) f(x) =8<: e^-x if x = 0; and 0 otherwise: a)...

• Replies: 1
• Views: 3,058
02-28-2006, 11:48 PM
22. ### School Lottery

Hi I have been assigned the task of calculating the expected value (E(X)) for a school lottery from the perspective of a ticked buyer. This is a...

• Replies: 0
• Views: 1,155
03-31-2012, 09:20 AM
23. ### Probability Problem related to Actuarial Sceince P1

An insurer o ers a health plan to the employees of a large company. As part of this plan, the individual employees may choose exactly two of the...

• Replies: 0
• Views: 4,764
02-26-2010, 09:18 AM
24. ### Expected value of absolute value without replacement

I'm trying to figure something out for as a curiosity of mine, and I apparently can't remember enough of my college statistics class to solve it. If...

• Replies: 1
• Views: 2,198
06-29-2015, 11:31 AM
25. ### Method of sampling

If 25 people sign up for a workshop which has room for only 10, the naive way to select 10 is to put 25 numbers in a hat and choose 10 (assuming each...

• Replies: 2
• Views: 1,590
01-15-2014, 01:30 AM
26. ### Looking for assistance with random prize probability among family

Hello all, I signed up specifically in search for some assistance in a real world problem, hope that's alright. We have an application that...

• Replies: 7
• Views: 2,939
06-29-2011, 11:55 AM
27. ### Probability after being given an initial condition

This is a question I have received on my test and I am not sure whether or not my answer is correct. question: you are given 3 bags. First bag...

• Replies: 1
• Views: 1,596
BGM
10-08-2012, 11:44 PM
28. ### Tricky question

Here's the problem: Let P(k) be a random draw of integers between 1 and k (inclusive). Assume you repeatedly apply P, starting at 10^1000. What's...

• Replies: 1
• Views: 1,743
BGM
11-11-2015, 09:31 PM
29. ### Poisson tricky problem

Suppose that N individuals have a certain gain "a" at t0 and that each of them at any point in time participate to an independent lottery which...

• Replies: 0
• Views: 2,635
02-18-2010, 01:14 PM
30. ### Probability of machine failure question

Hi, While I'm an engineer, and have training in stats and probability, those aren't exactly my strong points, so I thought I'd ask you folks --...

• Replies: 7
• Views: 4,003
01-20-2013, 02:43 AM
31. ### Probability

Hi everyone, how can i start this? i have a lot of 32k parts and I would like to calculate the probability of finding one bad part in this lot, how...

• Replies: 2
• Views: 1,632
08-25-2012, 04:36 PM
32. ### using wrong distribution

A small simple random sample is selected from a normally distributed populations for which population variance unknown. Construction of a confidence...

• Replies: 3
• Views: 4,401
11-30-2006, 04:01 PM
33. ### Conjunction of n hypothesis

Ciao all, :wave: I have a conjunction of n non-independant hypothesis: h1 and h2 and .... and hn. I want to calculate the probability of...

• Replies: 4
• Views: 3,560
09-16-2007, 09:38 AM
34. ### analyzing the PDF or the CDF ??

Hi, I'm recently grappling with the following problem: For my thesis i had to fit my data with two theoretical distribution (gamma and...

• Replies: 0
• Views: 2,359
08-27-2009, 07:22 AM
35. ### Method of moments

what are the advantages of using the method of moments instead of the maximum likelyhood for estimating the parameters? In my case I hade to find...

• Replies: 1
• Views: 2,695
08-27-2009, 08:52 AM
36. ### Help in solving a question

Hello everyone, I am working on some exercise questions from probability. I am stuck at this question. Can somebody help me to solve this. I would...

• Replies: 3
• Views: 1,595
08-13-2015, 12:33 AM
37. ### is this a renewal process?

Hi. I'm having trouble with renewal processes. I want to obtain a long run cost, and to do that, I want to prove that a process is a renewal process,...

• Replies: 0
• Views: 1,906
07-13-2009, 05:35 PM
38. ### Comparing CDFs using Chi squared?

HI, I have a set of data from which I can construct the cumulative distribution function. I then compare this contructed CDF with the CDFs of a...

• Replies: 3
• Views: 4,632
07-10-2008, 07:44 AM
39. ### Adjusted odd ratio interpretation

Hi There, I have a question regarding adjusted ODD RATIO interpretation I am trying to interpret a table of results of logistic regression...

• Replies: 1
• Views: 8,690
06-11-2009, 08:09 AM
40. ### conditional probability question

I'm having trouble with the following problem: I want to know P(X>C | W>C) with C a known fixed constant, X and W both normally distributed...

• Replies: 0
• Views: 1,082
04-15-2016, 10:28 AM
41. ### Converting a Wide Sense CycloStationary process into a Wide Sense Stationary process

Hello everybody :) I have a bit of a problem with understanding the conversion from a WSCS process X(t) to a WSS process Y(t) = X(t - \Delta) ....

• Replies: 0
• Views: 1,963
11-16-2011, 05:36 AM
42. ### Similar numbers in a data set

Hi guys, I am looking at a programming problem here, and would like to "deduce" a formula out of my problem. I have an array of n (known)...

• Replies: 2
• Views: 1,534
03-22-2014, 02:22 PM
43. ### Need help with Uniform probability distribution

Hey guys... I'm sort of confused about these two problems. If you guys can help me out that would be great. Problem: Suppose X is a random...

• Replies: 2
• Views: 2,553
10-15-2012, 12:22 PM
44. ### need help

hey kind people, i got some problems from my statistics assigment that i dont understand (couldnt get this 4 out of 15), so if you can give me...

• Replies: 2
• Views: 5,226
12-11-2006, 08:32 PM
45. ### Statistics and signal processing

Please, help me to understand with logic of mathematical calculations resulted in work pubs.drdc.gc.ca/PDFS/unc06/p518839.pdf. First of all to me the...

• Replies: 0
• Views: 1,897
08-30-2009, 02:18 PM
46. ### Standard Deviation

Is it possible to calculate the mean and standard deviation of a normal distributed source population when only a few sample means (of non equal...

• Replies: 5
• Views: 2,754
07-31-2009, 10:24 AM
47. ### Chance of winning - question

Hi, I have not figured out how to solve the following questions: 1. Report the chance that Bears wins at least 6 games this year. 2. Compute...

• Replies: 2
• Views: 1,714
07-28-2011, 02:34 PM
48. ### Can't reconcile probability information

Hello there! I'm doing a review course in probability that I thought would be trivial. By and large, I'm not having any difficulty, but one...

• Replies: 2
• Views: 2,406
01-25-2010, 02:41 PM
49. ### Probability of outcome that hasn't been previously recorded.

Hello, If I have three binary random variables: A B and C, and the following set of test results, how can I guess the value of x? A B C 1 0...

• Replies: 0
• Views: 1,932
09-27-2010, 01:09 PM
50. ### Tricky problem solution

Hi, A soccer team plays matches. -- If in a previous match it won, it has a 0.6 chance to win in the next match (if it failed, the chances to...

• Replies: 4
• Views: 2,071
09-04-2013, 12:57 AM
51. ### Probability Distribution Problem

Could anyone point me in the right direction in terms of how to approach the following questions based on the scenario below. If you could just break...

• Replies: 1
• Views: 2,847
11-21-2010, 04:42 PM
52. ### Simple question on calculating p-values

In a question that I am working on, I have to "report 10 p-values that I obtain" from a coin simulation. The question then goes on to ask that we...

• Replies: 1
• Views: 3,197
11-21-2010, 09:06 PM
53. ### Probability question

Here is the problem: To get to work, a commuter must cross train tracks. The time the train arrives varies slightly from day to day , but the...

• Replies: 4
• Views: 9,620
12-15-2005, 11:13 AM
54. ### Probability

HEllo! I have a trouble with probabilities and I need your help... The probability of an event is 2/10, which means 1/5 = .2 What is the...

• Replies: 3
• Views: 2,542
12-21-2005, 10:37 PM
55. ### Probability Problem

Hi, Here is the problem: Roll a die twice: What is the probability of observing exactly one 5? I think that the answer is 5/36: P(5)=1/6; P(5...

• Replies: 2
• Views: 3,186
01-05-2006, 07:59 AM
56. ### Help

Hello, Here is the problem: "Assume the heights of high school basketball players are normally distributed. For boys the mean is 74 inches with...

• Replies: 2
• Views: 4,809
01-23-2006, 05:49 AM
57. ### Special Dice

Here is the problem: Two players compete against each other by rolling dice- not the traditional dice ,though. One face of Alphonso's die has an 8...

• Replies: 2
• Views: 7,162
01-23-2006, 05:41 AM
58. ### Identify Statistically Significant Data Point when Mean/Variance Unknown

I am conducting a screen of a wide range of compounds and generating measurements for their effect on a protein. We have conducted some work on...

• Replies: 0
• Views: 2,266
09-30-2014, 05:11 AM
59. ### Calculating Probability of Failure

I am a solicitor with an engineering background. I have a client who needs to work out what the probability is that a customer will be injured by a...

• Replies: 6
• Views: 2,937
01-31-2013, 02:32 PM

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