Turn a confusing lab graph into one clear, evidence-based verdict in a focused three-day reading sprint. This digital ebook helps high school and early college STEM students decide whether an apparent difference or trend is meaningful without treating every measured change as proof. You will learn how to choose one comparison, read axes and units accurately, compare the size of a change with measurement spread, and account for error bars, repeated trials, ranges, and possible outliers. The method keeps you from overstating what the experiment shows while giving you a practical way to defend your interpretation. Work through your own existing graph as you read, using the One Question Lock and Signal to Noise Overlay to move from visual impressions to a supported, unclear, or not supported verdict. Finish with a concise two-sentence defense that names the pattern, cites the decisive comparison, and states the limit of the evidence.