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Understanding Fair Tests: Repetition, Replication, and Accuracy in Scientific Experiments

Explore the importance of repetition and replication in fair scientific tests, accurate observation, measurement, and data recording to ensure reliable and trustworthy experimental results.

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A shoe company claims: Our new running shoes will make you run 100 meters 5 seconds faster than your usual time!
Guide Questions: • Do you believe the claim immediately? Why or why not? • How can we test if the claim is true? • Should we test it only once or many times? Why? • What might affect the result of the experiment?
OTHER FEATURES OF A FAIR TEST
OBJECTIVES: • Explain the importance of repetition in scientific investigation • Explain the importance of replication in scientific investigation • Demonstrate proper observing, measuring, and recording of data • Appreciate why accuracy is important in science
In science, a fair test is not only about controlling variables. We must also ensure: • Results are reliable • Data is accurate • Findings can be trusted • Experiments can be repeated 👉 Two important features of a fair test: INTRODUCTI ON
In science, a fair test is not only about controlling variables. We must also ensure: • Results are reliable • Data is accurate • Findings can be trusted • Experiments can be NTRODUCTION
What are the two important features of a fair test Questio n
TWO IMPORTANT FEATURES OF A FAIR TEST: 1.Repetition 2.Replication
• The SAME scientist repeats the SAME experiment several times • It is done under the WHAT IS REPETITION?
• To check consistency of results • To reduce random errors • To increase reliability • To ensure precision of data PURPOSE OF REPETITION:
EXAMPLE OF REPETITION (SHOE EXPERIMENT) Step 1: Old shoes • Run 100 meters • Trial 1: record time • Trial 2: record time • Trial 3: record time Step 2: New shoes • Run 100 meters • Trial 1: record time • Trial 2: record time • Trial 3: record time
EXAMPLE OF REPETITION (SHOE EXPERIMENT) Then compare the average results. Guide Questions: 1.Are the results exactly the same each time? 2.What do we do if results are slightly different?
IMPORTANCE OF REPETITION • Reduces random errors • Improves accuracy • Shows consistent pattern • Makes results more reliable
• A DIFFERENT scientist repeats the SAME experiment • Under the SAME conditions • To verify the results WHAT IS REPLICATION?
• To check accuracy of findings • To confirm reliability • To ensure results are not biased or personal PURPOSE OF REPLICATION:
EXAMPLE OF REPLICATION You conducted the shoe experiment. Now another student: • Uses the same shoes • Runs the same distance (100 meters) • Uses the same procedure
EXAMPLE OF REPLICATION • If both results are the same, what does it mean? • What if results are different? • Why do we need other scientists to repeat experiments?
Repetition Replication Same scientist Different scientist Many trials Same experiment repeated Checks precision Checks accuracy Reduces random error Confirms findings REPETITION VS REPLICATION
1.Which one is done by YOU? 2.Which one is done by OTHER scientists? Questio n
ART FAIR TEST ACTIVITY Step 1: • Draw the same artwork using CRAYONS on cardboard Step 2: • Repeat the SAME artwork using: • Watercolor • Oil pastel
GUIDE QUESTIONS: 1.Which material worked best on cardboard? Why? 2.Did you follow a fair test? Why or why not? 3.What makes this activity similar to repetition? 4.Why is replication important in arts and
THANK YOU
OBSERVING, MEASURING, RECORDING DATA
MPORTANCE OF ACCURACY In science investigations: • Data must be correct • Observations must be clear • Measurements must be precise • Records must be complete WHY? • Because conclusions depend entirely on data.
Using the senses to carefully notice details Good observation includes: • Watching carefully • Noticing changes • Identifying patterns OBSERVING
1.What happens if we don’t observe carefully? 2.Can wrong observation affect results? OBSERVING
Using correct tools and units to get accurate data Tools used in science: • Thermometer (temperature) 🌡 • Stopwatch (time) ⏱ • Weighing scale (mass) ⚖ • Tape measure 📏 (length) • Beaker / graduated cylinder 🧪 MEASURING
1.Why is it important to use the correct tool? 2.What happens if we guess instead of measuring? MEASURING
Writing down observations and measurements immediately and correctly Good data recording: • Neat • Organized RECORDING DATA • Accurate • Done in real time
1.Why should we not wait before recording data? 2.What if we forget numbers? RECORDING DATA
✔ Ensures trustworthy results ✔ Helps other scientists use data ✔ Prevents errors ✔ Supports scientific MPORTANCE OF ACCURACY
1.What is repetition? 2.What is replication? 3.Give 2 measuring tools. 4.Why should data be recorded immediately? 5.Which is more reliable for checking results—repetition or replication? Why? ASSESSMENT
• Repetition = same scientist, many trials • Replication = different scientist repeats experiment • Observation = careful noticing • Measurement = using correct tools GENERALIZATION