Accuracy and Precision - PowerPoint PPT Presentation

1 / 8
About This Presentation
Title:

Accuracy and Precision

Description:

Title: Accuracy and Precision Author: Bangor Senior High Last modified by: NXP Created Date: 10/2/1998 2:45:46 PM Document presentation format: On-screen Show – PowerPoint PPT presentation

Number of Views:280
Avg rating:3.0/5.0
Slides: 9
Provided by: Bang92
Category:

less

Transcript and Presenter's Notes

Title: Accuracy and Precision


1
Accuracy and Precision
50
40
30
20
10
  • A MEASURE
  • of your
  • SUCCESS!

2
ITS TRUE!
  • Accuracy
  • indicator of the closeness of a measurement
    to its true or accepted value
  • Dependent upon
  • how carefully the measurement is taken
  • nature of the instrumentation used

3
Right On!
  • Precision
  • describes the agreement among several results
    measured in the same way
  • reproducibility of measurements

4
Tell Me!
High or Low accuracy and precision
High accuracy High precision
Low accuracy Low precision
Low accuracy High precision
5
Significant Figures
  • RULES TO LIVE BY
  • All nonzero digits are significant
  • One or more final zeros used after the decimal
    point are always significant

6
Significant Figures
  • Zeros between other significant digits are
    always significant
  • Zeros used solely for spacing the decimal point
    are not significant. (place holders)

7
Calculating with Sig. Figs.
1. Addition and Subtraction the answer must
be rounded to the same number of digits to the
right of the decimal point as there are in the
measurement with the smallest number of digits to
the right of the decimal
EX. 2.89 m 0.0043 m 2.8943 m 2.89 m
(correct of sig figs)
8
Calculating with Sig. Figs.
  • 2. Multiplication and Division
  • the product or quotient should be rounded to
    the same number of significant figures as in the
    measurement with the fewest total number of
    significant figures

Ex. 3.5293 g x 34.2 g 120.70206 g
121 g (correct of sig figs)
Write a Comment
User Comments (0)
About PowerShow.com