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Three apprentice tailors $(\mathrm{X}, \mathrm{Y}, \text { and } \mathrm{Z})$ are assigned the task of measuring the seam of a pair of trousers. Each one makes three measurements. The results in inches are $\mathrm{X}(31.5,31.6,31.4) ; \mathrm{Y}(32.8,32.3,32.7);$ $\mathrm{Z}(31.9,32.2,32.1) .$ The true length is 32.0 in. Comment on the precision and the accuracy of each tailor's measurements.

The average value of $X$ is 31.5 which shows the result are not accurate as mean value is not close to true one. Also the spread of the readings is 0.2 which means it is precise average value of $Y$ is 32.6 which is not close to true value hence not accurate. The spread of readings is also greater than $X$ and $Z$ which means less precise since the average value of $Z$ is 32.06 which is closest to 32 hence very accurate and spread of readings is 0.3 which means its less precise than $X$ but greater than $Y$ The most precise readings were of $x$ but the most accurate one was $Z$

Chemistry 101

Chapter 1

Chemistry: The Study of Change

Intro to Chemistry

Carleton College

University of Central Florida

University of Toronto

Lectures

02:29

Chemistry is the science of matter, especially its chemical reactions, but also its composition, structure and properties. Chemistry deals with atoms and their interactions with other atoms, and particularly with the properties of chemical bonds. Chemistry also involves understanding the properties and interactions of individual atoms and molecules for use in larger-scale applications.

04:42

In chemistry and physics, matter is any substance that has mass and takes up space by having volume. All everyday objects that can be touched are ultimately composed of atoms, which are made up of interacting subatomic particles, and in everyday as well as scientific usage, "matter" generally includes atoms and anything made up of them, and any particles and objects that act as if they have both rest mass and volume. However it does not include massless particles such as photons, or other energy phenomena or waves such as light or sound. Matter exists in various states (known as phases) that are defined by various physical properties, such as state of matter, phase, shape, and density. The Standard Model of particle physics and the general theory of relativity describe fundamental particles and the fundamental forces acting between them that control the structure and dynamics of matter.

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for first Taylor. We have pretty good precision because the numbers only differ by a value of one in the the last significant figure, which is an ideal precision. Uh, the next Taylor Taylor. Why the measurements? At least accurate because they're farthest from the true value of 32. And we see that they differ by more than one unit in the last significant figure collectively. And so Taylor why is not as precise nor accurate. X, although precise, is not very accurate because the average is not what its supposed to be. 32. Taylor Z, however, has, uh, not as good of, ah, precision as Taylor Ex because they differ a little bit more than one. But it's pretty good eso. It's relatively precise, but the average is almost spot on of 32 so Taylor's E is the most accurate

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