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Physics IA Student Checklist: Processed Data Criteria You have calculated the average value for your dependent variables (and the independent variable if appropriate) The number of decimal places OR sig figs you have used in your calculated average are consistent with those of the uncertainty for the dependent variable (and independent variable if appropriate) You have calculated the uncertainty of your average using the following formula (max − min) 2 Your uncertainty is recorded with the same number of decimal places OR sig figs as you average You have calculated the percentage error of your average using the following formula × 100 Your percentage error is recorded with the same number of decimal places OR sig figs as you average If you have used your data to calculate quantities (for example velocity) you have calculated the uncertainty for this quantity. REMEMBER: Addition/Subtraction; add the uncertainties (the ones you calculated) Multiplying/Dividing; add the percentage errors and then use that to find the uncertainty of that calculated quantity Powers; multiple the percentage error by the power (if squaring, multiply the percentage error by two) and then use that to find the uncertainty of that calculated quantity Square Roots; multiply the percentage error by ½ and then use that to find the uncertainty of that calculated quantity You may need to use a combination of the above; use the formula you are using to find your calculated quantity to guide you on calculating the uncertainties You have recorded all of your processed data in a table and all columns contain a quantity and a unit You have plotted a graph of your independent variable (x axis) and your dependent variable (y axis) The axis of your graph are labeled with the quantity and the unit Each data point has error bars (both vertical and horizontal) You have drawn a line of best fit that falls within the error bars and the line of best fit has been extrapolated back to the y axis If your graph is curved you have linearised it so that it is in the form y = mx + c You have calculated the gradient of your straight line graph and recorded it with the units You have drawn max and min gradient lines of your straight line graph You have calculated the uncertainty in your gradient using the following formula (max −min ) 2 and recorded the units If appropriate you have used your gradient to calculate a quantity (for example g) If appropriate calculate the uncertainty of quantity you calculated using the gradient of your graph using the following formula (max −min ) 2 For each graph you have drawn you have given it a title that describes what the graph shows Self Check Peer Check