Plan the range, number of sets of measurements and repeated readings

Plan the range and number of independent-variable settings

When the independent variable needs to be changed, choose a wide range: make the minimum sufficiently small and the maximum sufficiently large, and spread the remaining values roughly evenly between them. There is no need to force the values into an arithmetic sequence. Use six values for the independent variable. For this kind of question, where the independent variable is changed repeatedly, measure the corresponding dependent variable three times at each setting and calculate its mean.

Repeat readings at each setting

When the question does not involve changing the value of an independent variable and only asks for the value of one physical quantity, take three measurements and calculate their mean. Show the repeated measurements and the calculation of the mean in your answer; taking only one measurement will lose marks.