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YOUR NEXT DISCOVERY

Observation and measurement: make evidence you can trust

Read, correct and compare measurements, then defend a decision from the evidence.

3 Units17 MissionsAbout 3 hours

Complete the Course to Earn a Certificate and Join the Hall of Fame

A caliper measures a reference cylinder beside a gauge, ruler and repeated-reading markers.

See it. Try it. Make it yours.

  1. Read and describe a measurement

  2. Make observations traceable

  3. Test a method and defend a conclusion

For beginners. · What to know before you start

Bring with you: Add, subtract, multiply and divide ordinary numbers; compare numbers and read labelled values.

Make measurements that other people can check and use.

Read, correct and compare measurements, then defend a decision from the evidence.

By the end, you can…

  • Compare measurements and allowed errors written in different units.
  • Check a steady error without mistaking repeated readings for proof of accuracy.
  • Decide whether a part meets a size rule while keeping its measurement range in view.
  • Read an out-of-range warning as a limit instead of an exact value.
  • Find the range of a product or ratio from positive input ranges.

For another Course

  • Using probability to estimate a statistical confidence range.
  • Building electrical instruments and earning lab safety certification.

YOUR LEARNING PATH

One idea leads to the next.

View Course Map →
Unit 1

Read and describe a measurement

Name what you measure, read scales and units, and separate resolution from accuracy.

  1. Mission 1 of 17Name what you measureWrite what you measured, its value and its unit.Up next
  2. Mission 2 of 17Read both endsFind a length, time or volume change by subtracting the start from the end.Up next
  3. Mission 3 of 17Read the smallest stepUse the smallest step an instrument can show, and avoid extra digits.Up next
  4. Mission 4 of 17Separate agreement from accuracyCompare repeated readings with a known value, as well as with each other.Up next
  5. Mission 5 of 17Change units, keep the lengthCompare and combine measurements after putting them in matching units.Up next
Unit 2

Make observations traceable

Correct zero errors, compare repeated and paired readings, and keep a record others can check.

Unit 3

Test a method and defend a conclusion

Use measurement ranges in calculations, test a method, build a sensor rule and make a careful decision.

A Debsie Course · beginner