The marketing team of a renowned car company wanted to gain information from its customers regarding the performance of its new car. For this, the team designed a questionnaire with questions relating to the car's performance and distributed it among the company's customers. The data analysis of the survey showed that the customers were happy with the mileage of the car. The team obtained the same results when they conducted the same survey at all the company's outlets. This shows that the company's research study is: