1. UNIT 3 MEASUREMENT AND DATA PROCESSING
TIER 1 & 2

2. TIER 1 LEARNING GOALS
TIER 1 Define random errors Define systematic errors Define absolute uncertainties Define percentage uncertainties Define precision Define accuracy Define significant figures Define bet fit line Define independent variable Define dependent variable Define interpolate Define extrapolate

3. RANDOM ERRORS - errors that has an equal probability of being too high or too low
SYSTEMATIC ERRORS- errors that result from poor experimental design or procedures
ABSOLUTE UNCERTAINTIES- is the size of the range of values in which the "true value" of the measurement probably lies.
PERCENTAGE UNCERTAINTIES- interpreted as describing the uncertainty that would result if the measured value had been 100 units. It is calculated by dividing the absolute uncertainty by the measured value times 100.

4. PRECISION-refers to the closeness of a set of measurements of the same quantity made in the same way
ACCURACY- refers to the closeness of a set of measurements to the correct or accepted value of the quantity measured.
SIGNIFICANT FIGURES-digits in a measurement up to and including the first uncertain digit

5. BET FIT LINE-line on a graph that passes as near to as many of the points as possible
INDEPENDENT VARIABLE- the variable that is manipulated
DEPENDENT VARIABLE-the variable that measured
INTERPOLATE-estimating between points on a graph
EXTRAPOLATE-estimating beyond points on a graph

6. EXTRAPOLATE
INTERPOLATE

7. TIER 2 LEARNING GOALS Illustrate examples of random errors
Illustrate examples of systematic errors
Demonstrate the difference between precision and accuracy

8. RANDOM ERRORS THE READABILITY OF THE MEASURING INSTRUMENT
THE EFFECTS OF CHANGES IN THE SURROUNDINGS SUCH AS TEMPERATURE VARIATIONS
INSUFFICIENT DATA
TINY VIBRATIONS, VOLTAGE FLUCTUATIONS AND AIR CURRENTS INTERFERING WITH MASS MEASUREMENTS

9. SYSTEMATIC ERRORS
MEASURING THE VOLUME OF WATER FROM THE TOP OF THE MENISCUS
OVERSHOOTING THE VOLUME OF A LIQUID DELIVERED IN A TITRATION
HEAT LOSSES IN AN EXOTHERMIC REACTION
NOT ZEROING THE BALANCE
POOR LAB TECHNIQUES

10. High Accuracy High Precision
PRECISION AND ACCURACY
Low Accuracy High Precision
High Accuracy Low Precision
High Accuracy High Precision