P3.6—Data layout, tables and graphs

Prepare headings and units before collecting data. On a graph, put the independent variable on the x-axis, label both axes, choose a scale that uses the grid, plot points accurately and draw a justified best-fit line or smooth curve.

Mark an anomalous point clearly and decide whether the evidence supports excluding it; never erase it without explanation.

For rate against concentration, concentration belongs on x and rate on y. A smooth curve is appropriate only when the model predicts continuous curvature; otherwise use a straight best-fit line.

A line joining every point is not automatically a best fit, and a graph cannot rescue inconsistent units or poorly recorded raw data.