1) Any time a sample is used in marketing research, there will be two major types of errors, measurement error and sampling error. Briefly describe these two sources of error. Please provide an example of an advertisement to explain the above . You can provide video link.
2) Why are secondary data sometimes preferable to primary data?
3) What is a marketing research aggregator ? What role do these aggregators play in marketing research?
4) Discuss when focus groups should and should not be used. Provide an example.