Quantitative data is data that can be verified and quantified using numbers. Quantitative data is much more defining than qualitative data which is often used as a description.
Examples of Quantitative Data:
Question: Jack was driving his brand new corvette down the highway, as he looked up the red and blue lights were shining. As the police officer approached the car he asked "Do you know how fast you were going?" Jack responded, "I was going a little bit fast." The cop replied, "you were going 115 mph."