Accuracy and Precision

Slides:

Advertisements

Similar presentations

PRECISION and ACCURACY How low can you go?. CONTEXT There are two contexts precision and accuracy apply to: sets of data, and measuring instruments. In.

Advertisements

Understanding precision and measuring

Significant Figures Every measurement has a limit on its accuracy based on the properties of the instrument used. we must indicate the precision of the.

Errors and Uncertainties in Biology Accuracy Accuracy indicates how close a measurement is to the accepted value. For example, we'd expect a balance.

Accuracy vs. Precision What’s the Diff?.

Measurements: Precision, Accuracy and Uncertainty

SIGNIFICANT FIGURES.

1.07 Accuracy and Precision

Objective: Differentiate between accuracy and precision.

Accuracy: The closeness of a measurement to the true or actual value

SIGNIFICANT FIGURES. ACCURACY VS. PRECISION  In labs, we are concerned by how “correct” our measurements are  They can be accurate and precise  Accurate:

Timberlake LecturePLUS1 Chapter 1 Measurements Accuracy and Precision.

1 Measurement in Chemistry In chemistry we  do experiments  measure quantities  use numbers to report measurements.

Accuracy and Precision

Flashback Convert 2.58 m to kilometers. Accuracy and Precision Accuracy- the closeness of measurements to the correct value of the quantity measured.

Accuracy vs. Precision What’s the Diff?. Accuracy Accuracy refers to how closely a measurement matches true or actual values –To be accurate only requires.

Accuracy, Precision, Significant Figures

Aim: How do we record measurements? Do Now: Record the measurements of A, B, and C 0 A 1 2 B C 3.

Bellringer 9 / 9 / 2009 Rephrase the following quotation in your own words “There is nothing so far removed from us to be beyond our reach, or so far hidden.

Significant Figures Chemistry 10 Chemistry 10 Significant figures: the number of digits in an experimentally derived number that give useful information.

1 UNIT ONE Topic: Accuracy and Precision. 2 Accuracy How close a measurement is to the actual or true value good accuracy true value poor accuracy true.

How many significant digits? 5700 A.1 B.2 C.3 D.4.

Lesson 1-3a Accuracy, Precision and Certainty Pg 17 and 18.

V. Limits of Measurement 1. Accuracy and Precision.

Measurements: Precision, Accuracy and Uncertainty.

1 INTRODUCTION IV. Significant Figures. A. Purpose of Sig Figs Units of Measurement: Measurements indicate the magnitude of something Must include: –A.

V. Limits of Measurement 1. Accuracy and Precision.

Significant Figures… Bluefield High School 1. What is a significant digit? Significant digits is a set of internationally accepted rules for measurement.

Chemistry. Accuracy  how closely a measurement matches the true or actual values  only requires the true value (bulls eye) & one measurement (for the.

Accuracy vs. Precision. Calculations Involving Measured Quantities The accuracy of a measured quantity is based on the measurement tool. The last digit.

Measurement Precision Accuracy Measurements need to be precise and accurate!

BASIC LAB MEASUREMENTS AND EQUIPMENT EXPERIMENT 1.

Measurement: Significant Figures. Significant Figures  Significant Figures (sig. figs.): the number of digits that carry meaning contributing to the.

Significant Figures Calculate: x 1.76 = How do we round our answers? –Answer: Significant Figures (Sig Figs) When calculating using measurements,

Precision, Accuracy and Error. Precision When measuring, most of the time our measurements are estimates. How precise are these estimates? Precision is.

Significant Figures.

Accuracy, Precision, & Significant Digits

Significant Figures.

Objective The learner will distinguish between precision & accuracy of measurements.

Accuracy, Precision, Qualitative, and Quantitative

How to Read and Record Measurements

HB 1.A.4 through HB 1.A.8.

Measure a paperclip using each “ruler”.

Measurements and Uncertainties

Measurements and Sig Figs

Significant Figures Any digit in a measurement that is known with certainty plus one final digit, which is somewhat uncertain or estimated.

كتل الذرات Mass of Atoms.

Chemistry 02/06-02/07/17.

Scientific Measurement

Do Now & Announcements Grab a Handout (for after the quiz)

Scientific Measurement.

Measurements and Their Uncertainty 3.1

Measurements and Their Uncertainty

Measurements Scientists use two word to describe how good the measurements are Accuracy- how close the measurement is to the actual value Precision- how.

BELLWORK 9/2/15 How does a scientist reduce the frequency of human error and minimize a lack of accuracy? A. Take repeated measurements B. Use the same.

Significant Figures Aren’t all numbers important?!?!?!?

Accuracy, precision, and you

Measurements Scientists use two word to describe how good the measurements are Accuracy- how close the measurement is to the actual value Precision- how.

Measurement in Chemistry

Accuracy, Precision, & Significant Digits

Accuracy & Precision.

Accuracy vs. Precision & Significant Figures

Accuracy and Precision

Timberlake lecturePLUS

Measurements and Their Uncertainty 3.1

The Scientific Method Imagine a police investigation of a car accident. You are the detective. How would you figure out what happened?

Measurements Scientists use two word to describe how good the measurements are Accuracy- how close the measurement is to the actual value (how right you.

Measurement A person can only measure 7 basic entities. The following are the basic entities Mass Time Amount of matter Luminosity Electric current Distance.

Chapter 1 Science Skills.

Measurement Readings on Lab Instruments

Presentation transcript:

Accuracy and Precision Measurements Accuracy and Precision Timberlake LecturePLUS

Timberlake LecturePLUS Accuracy How close a measurement is to the actual or true value good accuracy true value poor accuracy Timberlake LecturePLUS

Timberlake LecturePLUS Precision How well several measurements agree with each other good precision poor precision Timberlake LecturePLUS

Accuracy and Precision What can you say about the accuracy and precision in each of the following: Good precision, poor accuracy Good precision, good accuracy Timberlake LecturePLUS

Timberlake LecturePLUS In your new job, you are to make the pizzas the size shown above. Your first four pizzas are shown below. What can you say about the accuracy and precision of your pizzas? Timberlake LecturePLUS

Timberlake LecturePLUS The next four pizzas. What can you say about the accuracy and precision of the next four pizzas? Timberlake LecturePLUS

Timberlake LecturePLUS Accuracy is improving. The two pizzas in the center show good accuracy. However, the precision is poor. Timberlake LecturePLUS

Timberlake LecturePLUS Pizza Precision You have very good precision, but poor accuracy. Timberlake LecturePLUS

Timberlake LecturePLUS Learning Check! Match the following terms 1) Accuracy 2) Precision ___ How close a measurement is to the true value. ___ How close several measurements are to each other. Can you have data that are precise, but not accurate? Why or why not? Timberlake LecturePLUS

Timberlake LecturePLUS Solution Match the following terms 1) Accuracy 2) Precision _1_ Is how close a measurement is to the true value. _2_ Is how close several measurements are to each other. Yes. Data can be precise, but not come close to the true value. Timberlake LecturePLUS

Precision and Accuracy Timberlake LecturePLUS

How Precise Can Our Measurements Be? You can only be as precise as your ruler or instrument allows you. Find the interval between the smallest marks on your ruler Move your decimal place one spot to the left. This is how precise you can be: estimate the last digit in your measurement and go to that many decimal places in the measurement you record. Timberlake LecturePLUS