Given: A marketing firm does a survey to find out how many people use a product of the 100 people contacted 15 said they use the product.
Required: Is the study experimental or observational.
Step-by-step explanation:
The results are obtained by a survey, in which people were asked a question regarding their choices, and their choices were observed and noted.
Therefore, it is an observational study, as members were surveyed, without trying to affect them and no experiment was performed.
Final Answer: Option A is correct.