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Published byLinda Shelton Modified over 5 years ago

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**Accuracy: The closeness of a measurement to the true or actual value**

Accuracy: The closeness of a measurement to the true or actual value. of what is being measured. BEING RIGHT! Accurate: Your measurement = 30.5 cm Actual length = 30.5

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**Precision: how SPECIFIC a measurement is**

Less Precise More Precise 10 m m m 12 m m m 9 m m m Groups of measurements that are CLOSE in range to each other = more precise More SIG. FIGS. = more precise

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**Precise instruments; Precise measurements**

Most precise (least estimation) Least precise (most estimation)

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**Precision Which ruler is the most precise?**

Which ruler is not accurate?

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Precision Precision of calculated answers is limited by the least precise measurement. Ex: 2.5 cm cm = 4.75 4.8 Measurements can be precise, but not accurate if an instrument is not calibrated correctly.

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**Precision & Significant Figures**

Answers cannot be more precise than the least precise information given Examples = 23.72 Answer: 23.7 In + and - : Keep same # of decimal places

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**Answers that Reflect Precision**

ADDING OR SUBTRACTING: Answer can only show as many decimal places as the measurement having the fewest number of decimal places. Example: When we add 3.76 g g g = g Our final answer is 20.7 g

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**Practice Quizzes on accuracy & precision:**

Key Points: Accuracy – Are your measurements close to the true value? Precision – Are a group of measurements close to each other or in agreement? More precise instrumentation leads to greater precision.

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