Kim is analysing the performance of a variety of small cars when they are fitted with fuel saver tyres, compared with their original tyres fitted.  Explain how this research is collecting data by experiment.

Identify the Research Subject: In this case, the research subject is a variety of small cars. Kim is studying how these cars perform when fitted with fuel saver tyres compared to their original tyres.

Formulate a Hypothesis: Kim might hypothesize that the small cars will perform better (in terms of fuel efficiency) when fitted with fuel saver tyres compared to when they are fitted with their original tyres.

Design the Experiment: Kim will need to design an experiment to test this hypothesis. This might involve selecting a sample of small cars, fitting them with fuel saver tyres, and then measuring their fuel efficiency. She would then compare these results to the fuel efficiency of the same cars when fitted with their original tyres.

Conduct the Experiment: Kim will then conduct the experiment as per the design. This will involve fitting the cars with the fuel saver tyres, running them under controlled conditions, and measuring their fuel efficiency. She will then repeat the process with the original tyres.

Collect Data: The data collected in this experiment will be the fuel efficiency measurements of the small cars when fitted with both types of tyres. This data will be collected through the process of running the cars and measuring their fuel efficiency.

Analyze the Data: Once the data has been collected, Kim will analyze it to determine whether the fuel saver tyres improve the performance of the small cars compared to the original tyres.

Draw Conclusions: Based on the analysis of the data, Kim will draw conclusions about the performance of small cars when fitted with fuel saver tyres compared to their original tyres. This is the final step in the experimental data collection process.