Standard Definition and 1000 Threads

Hi, I am doing an undergraduate introductory statistics course and I'm trying to understand some basic concepts. I'm trying to understand why the sample size (n) affects the standard deviation of the sampling distribution of the mean (σ_{M}) I understand how a sample size affects the...

Well, not new insights, but at least new paper and a new face: http://arxiv.org/abs/1204.0328 Particle Physics from Almost Commutative Spacetimes by Koen van den Dungen, Walter D. van Suijlekom the veteran in the team is van Suijlekom and it seems that he is pushing forward with some...

i need what we mean by B-L extension of the Standard Model ?

what is the the easiest way to learn standard model theory ?

Homework Statement Use standard identities to express sin(x+pi/3) in terms of sin x and cos x Homework Equations sin(a+b)=sinAcosB+sinBcosA The Attempt at a Solution sin(x)cos(pi/3)+sin(pi/3)cos(x) 0.5sinx + 0.8660cosx I'm just not sure if i need to simplify it even further...

Homework Statement Let T: R3-->R3, defined by T(x)= a x x Give the standard matrix A of T, and explain why A is skew-symmetric. Homework Equations They define u x v as u x v=(det [u2 u3/ v2 v3], det [u3 u1 /v3 v1], det [u1 u2/ v1 v2]) For any vectors u,v,w in R3...

Hello all. I have to present a proof to our Intro to Topology class and I just wanted to make sure I did it right (before I look like a fool up there). Proposition Let c be in ℝ such that c≠0. Prove that if {an} converges to a in the standard topology, denoted by τs, then {can}...

In this forum, "Beyond the Standard Model", most of the discussion is about quantum gravity. But technically, even neutrino masses are "beyond the standard model". Some years ago, a paper was written, "The new minimal standard model", which self-consciously set out to describe a minimal new...

What is the equation I should be using for the following question: At 298K a cell reaction has a standard emf of +0.17V. The equilibrium constant for the cell reaction is 5.5 X 10^5. What is the value of n for the cell reaction. Grateful for anyone's help!

I've a set of tests, and for each test, they have different size. I'll show an example. Test1 size - Time(seconds) 100 - 10 100 - 23 100 - 17 200 - 37 200 - 42 200 - 47 300 - 53 300 - 53 300 - 53 For each test, I took the average. Average1 size - average 100 - 16...

Homework Statement Let s be the linear transformation s: P2→ R^3 ( P2 is polynomial of degree 2 or less) a+bx→(a,b,a+b) find the matrix of s and the matrix of tos with respect to the standard basis for the domain P2 and the standard basis for the codomain R^3 The Attempt at a...

Determining Skew of a Data Set of Standard Deviations I currently have a formula to calculate the standard deviation of data using a sliding 20 period window which has allowed me to generate the histogram image seen below. My question is what calculations or formulas would I need to...

I am trying to calculate the standard deviation of a group of data based on a 20 period sliding window. I have run into a bit of a problem in knowing how to deal with gaps up or down in the readings and was wondering what the correct method for compensating for this was.Below is an example of...

Hello folks, I've got a bit of a problem with estimating the overall error in measurement of a function which I have sampled at sixteen independent points and have calculated the associated error bar with each point. The problem is I'm not sure how to combine all the sixteen errors into a...

Hi. I am an undergraduate physics student and have just begun lectures on elementary particles and the Standard Model. At the moment I really know nothing about this branch of physics and am looking for recommendations on a textbook which introduces the subject well. Thanks

Can someone please explain how the standard deviation is relevant when we are talking Brownian motion? And why is statistics important when we want to understand the movement of a brownian particle?

Homework Statement μ=10 σ^2=4 I seem to be getting the first two just time the same as i get every other problem, but I can't seem to get C)'s 'k'. typically i will take the absolute value of the portion that we are looking at, i.e. P(-10<X<10) would be |-10+10| = 20, divide that by two...

What's the difference between standard conditions and standard state? I noticed in my thermodynamics chapter that in standard state, the reaction quotient is 1 because all activities are equal to 1 (if I remember correctly). Standard conditions is about standard temperature and pressure...

I know this is more of a chemistry question but it's come to this I'm afraid. When calculating entropy changes in chemical reactions sometimes we students of chemistry use standard molar entropies of the reactants and products. But this surely doesn't account for the mixing effect. e.g. N2 +...

just looking at the standard model, which describes a host of fundamental particles and bosons, one could assume that the SM is a particle model. however, most of what i read appears to indicate that particles are merely "excitations" or manifestations of a field, and it has been stated on this...

http://nuclear.ucdavis.edu/~tgutierr/files/sml2.pdf Where is the = sign in this equation? Does it have one?

I'm trying to figure out where symmetry breaking occurs in Feynman diagrams. I'm just free wheeling here, correct me where needed. But as I understand it, when you have a Feynman diagram where there is an interaction of one particle which decays to others, the incoming particle may obey one...

Im reading Peskin&Schroeder, chapter 20, the one that describes the Standard Model. I got the general idea, symmetry breakings and so on, but I am getting quite confused when starting to go to the first mathematical details. My doubts are when, in eq 20.69 defines Q=T3+Y and then forces that...

Hi, I have a question If X1,X2,...,Xn are independent random variables having chi-square distribution witn v=1 and Yn=X1+X2+...+Xn, then the limiting distribution of (Yn/n) - 1 Z= --------------- as n->infinity is the standard normal distribution. sqrt(2/n) I know that Yn has...

Homework Statement There are 10 observations. (a) Suppose the IQR is 8. Is it possible that the standard deviation is 1? (b) Suppose the standard deviation is 8. Is it possible that the IQR is 1? Homework Equations IQR = R3 - R1 The Attempt at a Solution My argument is that (a)...

Source: http://en.wikipedia.org/wiki/Linear_equation General form:- It says (under the title General Form) "If B is nonzero, then the y-intercept, that is the y-coordinate of the point where the graph crosses the y-axis (where x is zero), is −C/B, and the slope of the line is −A/B."...

...I understand why it becomes more and more insignificant as the value of n increases, but what is the purpose of subtracting 1 from n in the sample population in the first place? Also, what is the purpose of squaring the result of x values minus the mean? I can do the problems. I'm just...

Homework Statement OK, this is something that stumped me. Homework Equations \int_{}^{}{\frac{dZ}{ A^{2}-Z^{2}}} = - \int_{}^{}{\frac{dZ}{ Z^{2}-A^{2} }} Right? \int_{}^{}{\frac{dZ}{ A^{2}-Z^{2} }}=\; \frac{1}{2A}\ln \left\{ \frac{A+Z}{A-Z} \right\}+\mbox{C} \int_{}^{}{\frac{dZ}{...

I've calculated the mean difference of my (normally distributed) data set. The mean difference is defined as: Now, I'm trying to calculate the "mean difference deviation" in order to generate a confidence interval for this quantity ( "95% of the differences in the set are greater than...

Calculate the volume of each reagent required to prepare 25.0 mL of each standard solution at the specified KSCN concentration. Fill in the rest of the table (attached). My complete guess is that the solution II needs to be incremented by 2.5 ml each time.

Hello General Engineering! I'm looking for a solution that will allow me to solve an equation (F=ma) by entering any two of the three variables, and then present that solution in a way that would be worth of reports/assignments. I'm currently requesting a trial of CSC Tedds, would love to...

Homework Statement Let x_{1},...,x_{n} be n observations. If y_{1},...,y_{n} is another set of observations s.t. y_{i}=ax_{i}+b , prove that s_{y}=|a|s_{x} . The Attempt at a Solution Attempt at a proof: Since \bar{y}=a\bar{x} +b then \bar{x}=(\bar{y}-b)/a and...

Hello, I'm doing some nonlinear regression fitting, and I have a set of data with n data points and I am fitting the data to a model which contains 3 parameters. I can get a confidence interval from the program I'm using for each parameter, but how can I calculate the standard deviation for...

Hello all This is not homework, i work in engineering. I have some data in a table, there are 3 columns and 5 rows. The data relates to how high or low one rail is to the other. The data was collected across 3 days. At each 7m intervals the height of the right hand rail was...

Circuit schematics for "standard" parts Hi, I graduated from computer engineering, but I want to learn more about circuits. I did get the chance to play with Quartus 2 in some of my courses and I was wondering if there is a place where I can learn about the circuit schematics for the most...

https://www.physicsforums.com/attachments/42263 https://www.physicsforums.com/attachments/42264 how we doing? i was just wondering does anyone have the properties of the following similar to the images attached.Natural gas, Water, standard oil. say motor oil properties.any oil properties...

I want to get a program to edit pdf files. I notice there are still the old 6.0 standard edition available very cheap. Any short coming get that as I am too cheap to get the latest or even the 9 version. I am not trying to do video and all the fancy stuff, just want to create document with...

Hi, I am working on FEM methods as a part of my senior year project and I have written a poisson solver for the same purpose. The solver works pretty well on the simple problems that I have designed as of now and seems to give correct answer (i.e. the data matches the theoretical prediction) 1...

This is coming from junior-level physical chemistry. Lots of thermodynamic properties of reactions involving solutions are tabulated under standard conditions; I'm particularly thinking of standard half-cell voltages, but any property will do. How do you make, say, a sodium chloride...

How can I make a constructor for a standard class that accepts my class? For example, I have a class x and I want to make it possible to C++-style cast it to a string (ie "string(x)" rather than "(string)x"); how do I do that/what does the constructor function declaration look like?

Alright, so I'm just getting through my first semester of QFT and while I'm not quite ready to step into anything really heavy, I'm close to the point where I can read introductory material on a technical level (like, I could probably start Zweibach's Strings for Undergrads). I've been reading...

Hi, I have a question. Glove Valve PN16, JIS10k , ANSI 150#, AMSE, all they equal same, in withstand the steam pressure? I heard RN16 stand for 16bar pressure, but it's for steam too? I'm confuse.. million thanks if anyone would teach me please.

Anyone know standard texts for the following subfields that would be suitable at all for self-study? 1) Digital Signal Processing 2) Control Systems 3) Circuit Design 4) Communications (Digital & Analog, Wired & Wireless) 3) Probability & Statistics for EE. 5) Power Systems & Machines...

Suppose X is the standard normal variable. is it possible to find P(X>x)? i.e does the function have a defined integral? How would you show that it is or is not defined? What information can we obtain about P(X>x).

A child with poor table manners is sliding his 240 dinner plate back and forth in SHM with an amplitude of 0.120 on a horizontal surface. At a point a distance 7.00×10−2 away from equilibrium, the speed of the plate is 0.370 . (a) What is the period (b)What is the displacement when the speed...

The length of time, t minutes, taken to do the crossword in a certain newspaper was observed on 12 occasions. The results are summarised below. Σ(t − 35) = −15 Σ(t − 35)^2 = 82.23 Calculate the mean and standard deviation of these times taken to do the crossword. My real problem is finding out...

Hi To test the fitness of a certain model to some observational data I use ki_squared goodness of fit test. As you might know, this test is appropriate for normal distributions. In fact, one uses the standard formula: X^2 = Sum [(Oi - Ei)^2/SDi^2] Oi average of the ith bin Ei...

Homework Statement For the reaction N2(g) + 3H2(g) <---> 2NH3(g) I am supposed to determine the equilibrium constant at 298K and 1 bar. We have been given a table that states that for NH3(g): \Delta_{r}G^{\Theta}= -16.45 kJ/mol I know that \Delta_{r}G^{\Theta}= \Sigma v...

If I have the definite integral of 1/sqrt(c2-dv2) (without a dv after it), with c a real positive constant larger than the upper limit of the integral, how can I get it into the usual form of an integral f(v) dv ?

http://en.wikipedia.org/wiki/Standard_enthalpy_of_reaction" of reactants (ΔHfO). My question is, why? And I also know that I can find http://en.wikipedia.org/wiki/Standard_enthalpy_of_reaction" (ΔHrO) by subtracting the bond energies of the reactants from the products. The result differs...