Answer :
A trainee mechanic trying to understand all the reasons a car won't start may want to draw a cause-and-effect diagram. This type of diagram is also known as a fishbone diagram and helps to identify the potential causes of a problem.
In this case, the trainee mechanic could use the diagram to list all possible causes of a car not starting, such as a dead battery, faulty ignition system, or low fuel levels, and then identify which causes are the most likely to be the root cause of the problem. A Pareto chart could also be useful to identify the most frequent causes of car starting issues, but a cause-and-effect diagram would provide a more comprehensive overview of all potential causes. A scatter-plot and a process flow-chart would not be as relevant in this situation.
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