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content provider: the Knock on the Door
written by the Knock on the Door
This resource, part of the Open Door website, provides basic information on the role of measurement in experimentation. It explores methods for measuring very small distances, graphing experimental results, "best-fit" line, and explores the role of uncertainty in measurement. For the teacher who expects students to do experimental or quasi-experimental lab work, this resource provides support in graphing results, writing an experimental report, and how uncertainty in measurement affects the final results.
Subjects Levels Resource Types
General Physics
- Measurement/Units
- High School
- Instructional Material
= Tutorial
Intended Users Formats Ratings
- Learners
- image/jpeg
- text/html
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Access Rights:
Free access
© 2005 David Hoult
graph, graphing, graphs, measurement, significant figures, uncertainty, units
Record Creators:
Metadata instance created December 14, 2005 by Cathy Ezrailson
Knock on the Door
Record Updated:
February 28, 2011 by Caroline Hall
Last Update
when Cataloged:
September 9, 2007
Other Collections:

AAAS Benchmark Alignments (2008 Version)

9. The Mathematical World

9B. Symbolic Relationships
  • 6-8: 9B/M3. Graphs can show a variety of possible relationships between two variables. As one variable increases uniformly, the other may do one of the following: increase or decrease steadily, increase or decrease faster and faster, get closer and closer to some limiting value, reach some intermediate maximum or minimum, alternately increase and decrease, increase or decrease in steps, or do something different from any of these.
9D. Uncertainty
  • 6-8: 9D/M4. Comparison of data from two groups should involve comparing both their middles and the spreads around them.
  • 6-8: 9D/M5. The larger a well-chosen sample is, the more accurately it is likely to represent the whole. But there are many ways of choosing a sample that can make it unrepresentative of the whole.

12. Habits of Mind

12B. Computation and Estimation
  • 9-12: 12B/H9. Consider the possible effects of measurement errors on calculations.
12C. Manipulation and Observation
  • 6-8: 12C/M3. Make accurate measurements of length, volume, weight, elapsed time, rates, and temperature by using appropriate devices.
12D. Communication Skills
  • 6-8: 12D/M1. Organize information in simple tables and graphs and identify relationships they reveal.
  • 6-8: 12D/M4. Understand oral, written, or visual presentations that incorporate circle charts, bar and line graphs, two-way data tables, diagrams, and symbols.
  • 6-8: 12D/M6. Present a brief scientific explanation orally or in writing that includes a claim and the evidence and reasoning that supports the claim.
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Record Link
AIP Format
Knock on the Door, (2005), WWW Document, (
Knock on the Door, Open Door Website: Measurements, (2005), <>.
APA Format
Knock on the Door. (2007, September 9). Open Door Website: Measurements. Retrieved May 23, 2018, from
Chicago Format
Knock on the Door. Open Door Website: Measurements. September 9, 2007. (accessed 23 May 2018).
MLA Format
Knock on the Door. Open Door Website: Measurements. 2005. 9 Sep. 2007. Knock on the Door, and Knock on the Door. 23 May 2018 <>.
BibTeX Export Format
@misc{ Author = "Knock on the Door", Title = {Open Door Website: Measurements}, Volume = {2018}, Number = {23 May 2018}, Month = {September 9, 2007}, Year = {2005} }
Refer Export Format

%Q Knock on the Door
%T Open Door Website: Measurements
%D September 9, 2007
%O text/html

EndNote Export Format

%0 Electronic Source
%A Knock on the Door,
%D September 9, 2007
%T Open Door Website: Measurements
%V 2018
%N 23 May 2018
%8 September 9, 2007
%9 text/html

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Citation Source Information

The AIP Style presented is based on information from the AIP Style Manual.

The APA Style presented is based on information from APA Electronic References.

The Chicago Style presented is based on information from Examples of Chicago-Style Documentation.

The MLA Style presented is based on information from the MLA FAQ.

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