Scatter plot examples11/6/2022 ![]() ![]() A personnel department plots salary against the results of a motivation survey.This results in a significant reduction in the number of rejected pieces. A Scatter Diagram shows a high positive correlation, prompting a redesign of the press, including the use of more heat-resistant materials. It is suspected that press temperature is causing rejects in a plastic forming process.He thus uses the time at the highest point on the curve to get the best chance of well-risen bread. A Scatter Diagram of rise time against measured bread density shows a fair correlation on an inverse U-shaped distribution. A baker suspects that the standing time of the dough is affecting the way it rises.This resulted in a measurable decrease in accidents. There was a high, positive correlation with traffic speed, with accidents dropping off more sharply under 30 mph.Īs a consequence, more traffic speed control measures were installed, including signs and surfaces.There was an inconclusive correlation with road conditions.There was a low, positive correlation with traffic density.The results enabled the following conclusion to be made: Scatter Diagrams were drawn for each possible cause against the accident count. In order to get sufficient measures, they made daily measures for two months, using local road sensors and reports from the ambulance service. As there was no clear evidence available to support any of these hypotheses, they decided to measure them, and used Scatter Diagrams to check whether the link between any of the causes was strong enough to take further action. Three main causes were suspected: the speed of the vehicles, the traffic density and the local weather conditions. A Toolbook for Quality Improvement and Problem Solving (contents)Ī town planning team, during an investigation of road accidents, identified a number of possible causes. ![]()
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