Thankfully you are a student of physics and can use your canny knowledge of resistivity to solve this problem!
In this task you will investigate the resistivity of graphite pencils. You will have to design an experiment that will produce enough evidence to predict how the resistivity relates to the hardness. You will have to collect enough data to give a reliable statement about the resistivity of the pencils you investigate and to create a table that can be used to test the unknown pencils accurately. You will have one double lesson to gather your results so it is important to plan your experiment before hand.Designing an experiment
Planning
You should work in groups of 2-3 to develop your method and then run your experiment
Assessment Rubric