This is the longest and most important section of the lab report.
Report every measurement taken in the lab, including the proper units. For each measurement, state what is the absolute uncertainty associated with this measurement.
Present your results using tables or graphs when possible. The results and calculations should be presented in logical sequence.
Show sample calculations, when needed for difficult or unusual calculation. A routine calculation need not to be included in the report. Any sample calculation must be accompanied by text. A report is like an essay, you cannot simply write down a list of algebraic steps without explaining what you are calculating.
For calculated values, use the propagation of uncertainties to calculate the associated absolute uncertainty. State in each case which method you are using.
Distinguish clearly between measured and calculated results. (e.g. you measure the position for several time intervals, and from this you calculate the velocity). Calculated values are not necessarily theoretical values. A theoretical value comes only from the theory or from an accepted value quoted in a reference.
Compare your results with the expected values whenever possible. If you measured the same value with different methods, compare these values together using the calculated uncertainty range. Simply calculating a % error is not sufficient to assess the validity of your experiment.
Answer any specific question the lab handout might contain.