Errors Definition and 328 Threads

Completely new to the concept of errors and don't know how to approach this... Calculate value and error in Z Z= 2AB^2/C Where A= 100 Error in A= +/- 0.1 B= 0.1 Error in B= +/- 0.005 C= 50 Error in C= +/- 2 Plugging in the numbers Z= 0.04 How do you carry the errors...

Homework Statement Hello If my data errors are normally distributed, is this the same as the data being normally distributed? I mean, by "normally distributed data errors" is meant that with 68% confidence the data lies within the true value?

Hello, It is sometimes stated that the great minds of theoretical physics also made many mistakes, and were not afraid to do so, since you have to dare to make mistakes if you want to do some original thinking; but the errors are forgotten, and the good things are remembered. Now my question...

Hi all! Having decided to return to coding some of the physical problems that I require solving(in lieu say, of Mathematica), I endeavored to adapt the Crank-Nicolson to my needs, but, in order to test my algorithm, I had first attempted to resolve the common and trivial heat equation, in one...

Young's doublt slit experiment - Systematic and random errors - URGENT! Homework Statement Can anybody think of any other systematic and/or random errors for young's double slit experiment when using it calculate the wavelength of a light source? I have an inclass prac write up tomorrow and...

This sounds lovely. http://news.yahoo.com/blogs/technology-blog/undetweetable-keeps-those-embarrassing-updates-alive-even-ve-012135771.html

Hi I've got a problem with VHDL code its comming up with a lot of errors saing that there's undefined symbols, so I am pretty sure that the error is to do with defining things/instantiation, below is all the code for both the files that are being used...

I need sources of error (4) , and some enhancements for accuracy (4) for a lab experiment involving speed of sound. The experiment is as follows (as I have done it) 1. Using water to move a tube up/down to look for the first antinode. 2. Used a 512 Hz tuning fork to create the vibrations. 3...

Homework Statement Mindy solves the problem (x+4)(x-3)=8 by setting x+4=8 and x-3=8, thereby getting the solutin x=4 from both equations. she checks her answer by substituting x=4 into the original equation and finds that it works. She concludes that this quadratic equation has only one...

I'm trying to write a MATLAB code but I get an error message which I'm not sure why. The code is follows as, %%%%% Code %%%%% for i = 1:1:v; for j = 1:0.1:a TSR(i,j)=wR/i; end end %%%%% Code %%%%% Here 'a' is taken as...

Homework Statement -precipitate not being pure e.g. other ions (present in the precipitate increasing the weight of the precipitate) - in an experiment where BaSO4 is used and some of it isn't dissolved in the wash due to the 'low solubility' of BaSO4 - resulting in a lower weight...

A vector in special relativity is the quantity: V = V^\mu \hat{e_\mu} On a change of coordinates, the basis vectors co-vary with the coordinate derivatives: \hat{e_\mu'} = \frac{\partial x_\mu'}{\partial x_\mu} \hat{e_\mu} The vector elements are the opposite. They are said to be...

Homework Statement Just need someone to confirm whether I am right for this (The prac is using back titration to find the amount of Nitrogen in Fertiliser) How would the following affect your experiment: Burette, pipette and volumetric flask are rinsed with the wrong solution i.e water...

can anyone please explain me following errors of gyroscopes used in inertial navigation systems of aircraft : a) what is transport wander , how actually it happens ? b) what is apparent drift in gyroscope ? c) what is coriolis effect and how it causes errors in gyroscopes ?

How to prove the normal law of errors?

Poisson errors for the distribution of galaxies?? Hi, I have some data regarding the distribution of galaxies of varying mass in different density regions of the Universe, from which I have a mass functions for each region. I would now like to introduce some errors so I can determine whether...

A book of 100 pages contains 200printing errors distributed randomly among the pages. the probability that one of the pages will be completely error free is closest to a)67% b)50% c)25% d)13% The Attempt at a Solution I tried to calculate total number of possible events. I...

Homework Statement I need to find the uncertainty on "n2" I have the uncertainty on lambda, n1 is not a variable - its 2, R is a constant. Only things that have errors are lambda and n Homework Equations The Attempt at a Solution Tried working out using calculus, but every...

Hey guys, I was just wondering what is an error during a lab? I always get these parts wrong on my lab, mainly because I don't know of any errors that are occurring in a lab. For my lab I was using a ballistics pendulum and sometimes the rod wouldn't pull back right or shoot right. Would that...

Homework Statement This program simulates the actions of two elevators in a building. The building has MAXFLOOR floors - make this a program constant and set it to 15. You need to write an Elevator class. This class will have only one member variable, which is the floor of the building on...

I have a program written in Fortran IV and tryed to run it with fortran77(g77). Nevertheless it could be not problem in fortran IV it make some errors in fortran77. I am not programmer but trying to learn some. Here is the errors that compiler fortran77 is wrote: found.f: In program...

wikipedia is full of errors

I am confused over how to work with errors and uncertainties. So far when dealing with a small number of measurements I have used the partial derivative method to calculate the final error in my result e.g. if my result is E=mgh \text{ then assuming no error in g my uncertainty is }...

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...

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...

I just started the semester off in physics lab and I am so rusty. I did three perfectly okay by myself but these last three I can't seem to figure out. Any help on the direction to take with these is appreciated! c) T = 0.433 ± 0.004 s. Calculate T^2 andΔT^2. d) Given d = vt, v = 55...

*Before I start, I just want to say that this is only my second day in IB Physics. I had never taken Physics at in in high school prior to IB Physics, so I really had to read up and pretty much self-teach myself a bit of it over the summer. Of course, even now I still have absolutely no idea...

Homework Statement #include <iostream> using namespace std; int main() { int firstNo;// first number is stored here int secondNo, int resultAdd,// variable for result when first number and second number are added int resultSub,// variable for result when first number and second...

Tell me why am i not able to compile this program, the terminal lists various errors http://tinypic.com/r/1zxtm5h/7

Can someone tablet some errors(better with improvement) or precautions when discharging a capacitor? The experiment aims to investigate the decay curve of charge/current when discharing a capacitor. Thanks!

Homework Statement In an inertial navigation system on switching ON an intial error of 0.0001m/s^-2 exists in one direction. After 30 minutes an additional error of -0.00005m/s^-2 in acceleration builds up. The system navigates for 2hrs 30 minutes after switching ON. compute the error in...

Hi all I was searching the web to clarify a conceptual issue regarding the wavefront map in Zemax optical design software. Wavefront map in Zemax is suppose to tell us about the aberrations in the optical system. If I propagate a plane parallel beam in air from the object (at infinity) to...

we write \frac{1}{R}=\frac{1}{R_1}+\frac{1}{R_2} where R is the equivalent resistance of R_1 and R_2. Let there is an error in the measurements of R_1 and R_2 of \pm \Delta R_1 and \pm \Delta R_2 respectively. Is it correct that \frac{\Delta R}{R^2}=\frac{\Delta...

http://www.sciencedaily.com/releases/2010/06/100613212708.htm ScienceDaily (June 14, 2010) — New research by astronomers in the Physics Department at Durham University suggests that the conventional wisdom about the content of the Universe may be wrong. Although at the bottom of the page he...

Let's say I'm testing anti-spam software. The number of false positives (aka, friendly messages misidentified as spam, for those who don't know the term) is 40. The number of false negatives (spam messages misidentified as friendly) is also 40. I'm testing 100 messages. How many more...

Homework Statement From the taylor series we can replace x =x_{0} + h but how does \delta f = f(x_{0} + h, y_{0} + k) - f(x_{0},y_{0}) become \delta f = hf(x_{0}, y_{0}) + kf(x_{0}, y_{0}) I can see the first step, but how do you get it to the second?Homework Equations The Attempt at a Solution

Homework Statement I need to introduce Gaussian errors to a set of velocity measurements. The errors should have mean zero and standard deviation .2. v = [4.6 3.8 7.2 9.7 6.4]; The Attempt at a Solution I tried to use Matlab's imnoise command (J=imnoise(v,'gaussian',0,.04), but...

Cant seem to find information on this anywhere... If I want to average two values with errors, say x1 = 10 +/- 2 x2 = 12 +/- 4 I would do a regular weighted average that would reflect the fact that x1 is a more precise measurement. But what if my errors are asymmetric? So if I had...

Hi, I was wondering if anyone can point me to a general treatment of errors when doing numerical integration of measured variables? My problem is that I am integrating force with respect to displacement (of a piston) in an attempt to calculate work...and getting some impossible numbers...

What kind of errors would be produced by "excess" taq in PCR? Not sure if this belong in the Homework section. Put it here since it's not homework. What kind of errors will I get by adding 6.75µL taq pol to +50µL of cDNA? The master mix will be added to the cDNA resulting in an excess of taq...

I have a simple task of measuring the changes in volume (delta V) of water due to rising temperatures. I have trouble combining certain errors. How would one get the error for (V0-V)/V if one already knows the error for V0(volume at start of measurement) and V(measurement of volume). I...

Hi, I have a question about standard errors in the context of this problem. Any help would be greatly appreciated: Suppose X is a discrete random variable with P(X=0) = 2y/3 P(X=1) = y/3 P(X=2) = 2(1-y)/3 P(X=3) = (1-y)/3 Where 0<=y<=1. The following 10 independent observations were...

hi. not sure if this is the right forum. i have latex code that I'm trying to get to print but it's giving me 28 errors and i can't find any of them i've got it to display nice but I'm still getting 28 errors when i run and they're all apparently related to missing brackets and stuff but i...

This is just my own practise question. I have a relationship of r = \frac{D}{2}sin4\theta The apparent error formula is now: \left(\frac{\Lambda r}{r}\right)^{2} = \left(\frac{\Lambda D}{D}\right)^{2} + 16 \left(\frac{\Lambda \theta}{tan 4 \theta}\right)^{2} Using a standard...

Homework Statement Suppose we have the following program segments: int *zPtr; int *aPtr = NULL; void *sPtr = NULL; int number,i; int z[5] = {1,2,3,4,5}; sPtr = z; point out the error of the following code: (a) ++zPtr; (b) number = zPtr; (c) number =...

Ok as you seen I been trying to get familiar with a few different type of exercises, this is a FBD type exercise. I attached the picture showing the exercise done, I just want you to check if you notice any errors, thanks you. Homework Statement Cylinder A- Mass 75kg and...

This has been very comfusing. Is the error in taking a reading the smallest or half the smallest division? Say a standard 30cm ruler, you can judge to nearest 0.5mm but since you take 2 readings you need to double the error. But then in titrations using a lab burette you count the titre as half...

Basically, I have used microwaves in a wave guide to measure the width of the guide via standing waves. This led me to plot a graph of 1/wavelength in the guide^2 vs 1/wavelength^2 in air. The graph showed the following formula; y = 1.0741x + 455.08 with an R^2 value of 0.9979 from 5 points...

I just lost 20 points on my last physics test because of making stupid careless mistakes how can i cut down on these my teacher doesn't give partial credit on one question i thought it asked to find the maximum height, it turned out that it asked for the Range the object traveled...

Hello all, I'm kinda stuck with this fortran 95 program I have to write. It is an Infinite Series of SIN. IMPLICIT NONE ! ! Data Dictionary REAL :: x ! Measurement of angle in degrees REAL :: result ! facilitates addition of the functions REAL :: f_x ! function defining the series REAL...