Standard Definition and 1000 Threads

Suppose we have a large population of houses in a community. The average annual heating expense for each house is $400 with a population standard deviation of $25. A random sample of 25 houses had a sample mean of $380 and a sample standard deviation of $35. 1.What is the mean of the sampling...

hello everyone, i have this (decreasing) nested sequence of open sets (intervals of infinitesimal radius) about 0. i just want to know if the intersection of the sets described above is still bounded away from 0. that is, is it true that the countable intersection of such balls with...

Homework Statement A jet engine manufacturer estimates that the chance of a “critical-item” failure within a jet engine’s afterburner module is approximately 1 in 220. What is the standard deviation of the number of launches, before a “critical-item” failure occurs within a jet engine’s...

Prove that Cl(Q) = R in the standard topology I'm really stuck on this problem, seeing as we haven't covered limit points yet in the text and are not able to use them for this proof. Can anybody provide me with help needed for this proof? Many thanks.

Hello All, I am having to brush up on my stats for work and it's been a long time (>10yrs) since I've had to even think about this stuff. I could do with some help clarifying a specific point about standard errors and margin of error. An example I am looking at from my old notes is this: the...

Homework Statement Palladium(II) forms an intensely colored complex at pH3.5 with arsenazo III at 660 nm. A analyst is trying to analyze the palladium content in a meteorite. First 2.534g of the meteorite was digested in strong mineral acids. The resulting solution was then evaporated into...

I have to finish this one question that I have come across and I am having a bit of trouble figuring out where to go from what I havee done. The Q is: A copper cylinder is 5.82 +/- 0.06 cm long and has a radius of 2.53 +/- 0.04 cm. Using the appropraite formula, Question Details a) Find...

Is fcntl.h more fundamental than stdio.h? Using just stdio.h, I can define a FILE type, and use an fopen() command to open a file and return the address of the file into the FILE variable. Using fcntl.h, I use open() instead of fopen(), and instead of returning a FILE type, open() returns...

Homework Statement Convert the following as full (decimal) numbers with standard (base) SI units: 86.6 m The Attempt at a Solution I thought I could just change it to 8.66x10^1 then just add the 10^-3 because of the milli to make it 8.66x10^-2. But I'm wrong so could someone help me?

Given a http://en.wikipedia.org/wiki/Simplex#The_standard_simplex" in \mathbb{R}^n: \Omega = \left\{ {{\textbf{y}}:\,\,\,\,{y_i} \ge 0,\,\,\,\,1 = \sum\limits_{i = 1}^n {{y_i}} } \right\} where n is a positive integer, and a vector \textbf{a} with n elements a_i>1, I need to evaluate the...

Thoughts on this?

Homework Statement If z = 4 + i and w = -2 +2i, determine (z+w)5 using Pascal’s Triangle and standard form. Homework Equations The Attempt at a Solution

"standard" Square is not a Smooth Submanifold of R^2 Hi, everyone: I am trying to show the standard square in R^2, i.e., the figure made of the line segments joining the vertices {(0,0),(0,1),(1,0),(1,1)} is not a submanifold of R^2. Only idea I think would work here is using the...

I was looking at a textbook on Introductory Nuclear Physics, and I came across this book: The Standard Model and Beyond By Paul Langacker http://www.taylorandfrancis.com/books/details/9781420079067/ It seems relatively complete. Anybody read this? Any thoughts/comments? What are other...

Statistics. The bane of my existence... and then a bit of statistics "revision" rears its (in my opinion) ugly head in my quantum physics course and I have absolutely no idea what to do. Homework Statement 1. Suppose you measure the height of all students at the University. You use a ruler...

Perhaps if we focus on the common philosophy of the great physicists as to what physics is and ought be, expressed in their simple words reflecting infinite wisdom, we will be better prepared to advance physics beyond the standard model. Equations are more important to me, because politics...

Why can't we analytically continue our model of the Universe past the Big Bang in a way analogous to how the Euler sum is analytically continued into the zeta function? If this were possible, this extension would encompass a larger phenomenon but would reduce down to our Universe when certain...

gas flow rate has units of "sccm" that standard cubic centimeter per minute. what does "standard" means here? how is derived? if there is gas flow of 1 sccm then how much gas flows in cubic meters?

Hey, I would like to ask you: I need have Standard Model with right-handed neutrinos. This is the simplest extension of SM which contains the Dirac and Majorana neutrinos. PR (right projection operator) coefficients should be nonzero. Is that enough? But what is their value? In the SM for the...

I do not think that the following was presented as a live video. http://indico.cern.ch/getFile.py/access?contribId=169&sessionId=51&resId=0&materialId=slides&confId=73513 Vanishing Dimensions and Planar Events at the LHC LANDSBERG, Greg 14:20 - 14:35 Room: Salle 242B At...

Homework Statement The scores of one class on the Unite 2 mathematics test are shown in the table below. Find the population standard deviation of these scores, to the nearest tenth. Unit 2 Mathematics Test Score - Number of people 96 - 1 92 - 2 84 - 5 80 - 3 76 - 6 72 - 3 68...

Hi, im trying to write my own version of the C standard function strspn. It returns the number of characters in str2 that exists in str1. I cannot get mine to work. #include <stdio.h> #include <stdlib.h> int strspn(const char *str1, const char *str2){ int n; const char...

Hi, I'm having a little trouble with this question: Among entering students at a certain college, the men averaged 650 on the Math SAT, and their SD was 125. The women averaged 600, but had the same SD of 125. There were 500 men in he class, and 500 women. Q) For the men and the women...

Hello; I apologise for any typing errors, as I am typing from a handheld device. However, there is something that I do not understand about the standard model. I have read that this equation is a 'lagrangian' but I do not know what this means or how to work with one. According to what I...

Homework Statement Hi, I was wondering what does a standard introductory, algebra-based Physics course cover first, rotational motion/torque or energy and conservation? This is the time period right after Newton's Laws. What usually comes next? Circular/Rotational Material or Energy? Thanks...

Homework Statement A sales contract between a manufacturer and a buyer requires 20 towels to be subjected to a water absorption test. If no more than 2 towels fails the test, the batch is accepted. If 2 or 3 towels fail the test, an additional 20 towels are tested. The batch is then accepted...

I'm having trouble deriving the amount of dimming expected of standard candles (eg. type 1a supernovae) as a result of dark energy. Without the presence of dark energy, the standard GR solution (matter-only, at critical density) is that the absolute bolometric brightness of a standard candle...

http://articles.latimes.com/2010/jul/07/science/la-sci-proton-20100708 Like the article says, if this experiment is true, the proton is 4% smaller than originally thought. If true, doesn't this mean we have to throw out everything we think we know about particle physics (standard model...

Let's say I monitors my local aquifer (Edwards) using well J-17 over the past 8 summers (not counting this summer). I found that the mean water level/day is 680 ft above sea level, with a standard deviation of 30. Assuming a normal distribution, how do I find the probability that the aquifer...

If one is contemplating a nuclear plant or production facility, these are just of the Review Plans and Standards one is required to meet. There is also 10 CFR 50 and the numerous Regulatory Guidelines (Reg Guides). http://www.nrc.gov/reading-rm/basic-ref/srp-review-standards.html Digging...

Homework Statement I have two sets of data, each with 30 distances and 30 results, I have the mean, median, mode, range etc, I have drawn histograms and cumulative frequency curves, got the IRQ for both sets of data. Now I need to compare the data using standard deviations and also find...

standard entropy of formation ?? Homework Statement the standard entropy of formation of magnesium is 32.7 J/mol k , That of oxygen gases 205.2 J/mol k at that magnesium oxide is 26.9 J/mol k . A) What is the entropic energy change when 25 grams of magnesium are burned inexcess...

what are the draw backs in using simple pendulum as a time standard?

What does this mean? Average? Sum?

I am trying to find out how many possible puzzles can be created out of the standard 9x9 grid. I was never very good at permutations and combinations, so I won't get very far here... All I can think of at the moment is that while there are 9^{81} ways to fill all the boxes with numbers from...

OK I was going to post this in homework, but it's not homework (left school a long time ago ;)) Anyway when I was at school I did not do stats I did mechanics instead (you had a choice). However all the people doing stats were always on about the the SD, which was a bit annoying cos I...

fuzzy logic can be emulated with "standard logic" if fuzzy logic can be emulated with "standard logic" then how can it be fundamentally different? shouldnt any newly proposed logic system, by definition, be impossible to model with another logic system? If you can emulate it then its not...

Hi, sometimes when I'm trying to work out the Fourier Transform of a signal, I get different answers depending on whether I use Fourier Transform properites (such as rect(t) will go to sinc(f) etc) or whether I use the FT integral. Here's an example where I'm not sure which 1 is the correct...

I have spent a while trying to get to grips with the building blocks used for constructing feynman diagrams, below is my attempt at a set of reactions, how am I doing so far? I don't think e^{+}e^{-}\rightarrow\mu^{+}\mu^{-} can happen since a gluon only interacts on particles with a...

I would like to understand the theory behind the standard deviation formula. The way it was explained to me, you have to subtract each value from the mean and square it to avoid the negatives canceling out the positives. After multiplying and dividing by the correct frequencies, we have to...

[b]1. A voltmeter is used to measure a known voltage of 100V. Forty percent of the readings are within 0.5V of true value. How do I figure out the standard deviation of the voltmeter, and how do I figure out the probability of an error of 0.75V? [b]2. I am trying to figure this problem...

Homework Statement A Sample of gas 250 mL at 37 C and 730 torr . What volume would gas occupy at standard conditions ? Homework Equations pv = nRT V2 = T2P1V1 ------- T1P2 The Attempt at a Solution Sample Gas V = 250 mL ( 0.250 L ) P = 730 torr ( .960...

Homework Statement Homework Equations Not completely sure, but I believe equation is: Cx = bCs/mVx cx = concentration of sample b= y-intercept cs= concentration of standard m=slope Vx=volume of sample The Attempt at a Solution I plotted the values on a graph with Absorbance...

Homework Statement Hi, I have this question that is bothering me. If I have a large set of data, each with its unique error uncertainty. How do I get the average error uncertainty from all the data points? Do I simply use the equation below: (∆ Z) ² = (∆A)² + (∆B)² And divide...

It is my understanding that the world of physics is split by a fast chasm into experimental and theoretical physics. The first time I told my father I wanted to be a physicist, he asked me “experimental or theoretical physics?” I thought for a second and responded “both!” He went on to explain...

Homework Statement This is an example in my book with omitted steps. Suppose the reaction time X of a randomnly selected individual to a certain stimulus has a standard gamma distribution with alpha=2. When X is continuous P(2<=X<=5) = F(5;2)-F(3;2) = .960-.801 = .159 Homework...

A big part of the theory of the standard model is that the major forces are mediated by the exchanging of elementary particles. So hypothetically, if we discovered some material that blocked the photon, for example, does this mean an object wrapped in this material would be unaffected by the...

How the Berkeley edition Calculus book by Stewart differs from the "standard" one? Hi, Since I'm going to do a self study of so-called Calculus II, I've made my research and decided to go with the course schedule from Berkeley Math 1B. Here are some of the schedules from the recent years...

Homework Statement Graph the following: 15(x+2)^2 + \frac{(y+3)^2}{4} = 4 Homework Equations \frac{(x-h)^2}{a^2}+\frac{(y-k)^2}{b^2}=1 The Attempt at a Solution I can't seem to get both coefficients to 1, since the right side is only 4. If I multiply the whole thing by 4, I can...

Homework Statement The standard enthalpy of formation for liquid water is -285.8 kJ / mole. Which of the following could be the standard enthalpy of formation for water vapor? A) -480.7 kJ / mole B) -285.8 kJ C) -241.8 kJ / mole D) +224.5 kJ / mole Homework Equations The...