A traffic analyst is investigating vehicle speeds on a stretch of the M4 motorway. Rather than setting up her own speed-measuring equipment, she obtains an archived dataset from Highways England containing 12,000 12,000\,12,000 speed records captured by automated average speed cameras during a week in October. The dataset includes the average speed of each vehicle (recorded to the nearest 0.1 mph0.1\text{ mph}0.1 mph) and the vehicle classification (e.g., Car, Van, HGV).
Which option correctly classifies the source of the analyst's data, the variable 'average speed', and the variable 'vehicle classification'?
Source is primary; 'average speed' is continuous quantitative; 'vehicle classification' is qualitative.
Source is secondary; 'average speed' is continuous quantitative; 'vehicle classification' is qualitative.
Source is secondary; 'average speed' is discrete quantitative; 'vehicle classification' is qualitative.
Source is secondary; 'average speed' is continuous quantitative; 'vehicle classification' is quantitative.
235 exam-style questions on AQA A Level Psychology Data handling and analysis. Each one has a worked solution and a mark scheme showing where the marks go.