Accuracy vs. Reproducibility • Accuracy – how close a measurement is to the true value. • Reproducibility- how close a group of measurements are to each other. • Scientists aim for both accuracy and reproducibility • To ensure accuracy, you need to make sure you take measurements carefully using appropriate tools. • To ensure reproducibility, you need to repeat the measurements a few times.
Accurate vs. Reproducible Neither accurate nor reproducible Reproducible but not accurate Both reproducible and accurate
Examples: • 3 Students measure Mrs. Calverley’s height. They get 62 cm, 61.5 cm, and 62.3 cm. Her actual height is 157.5 cm. Accurate, reproducible, neither, or both?
Example 2 • 3 Students measure the distance a toy car moves in 5 seconds. The distances they measure are 48 cm, 152 cm, and 2 cm. The actual distance was 80 cm. Accurate, reproducible, neither, or both?
Example 3 • Students measured the boiling point of water. They measured 100 C, 100.5 C and 99.5 C. The boiling point of water is 100 C. Accurate, reproducible, neither or both?