1.An A/B testing is a field experiment without applying randomization.

True

False

2. A/B testing can help establish the external validity of a causal relationship.

True

False

3.Why is it important to test if randomization works in the Rocketfuel case? Select the most appropriate option.

		To see if the influences of extraneous variables are minimized.
		To perform an appropriate statistical test
		To establish external validity
		To enhance reliability

4. A researcher wants to examine how the pandemic influences consumer choice. The researcher collected data from the COVID-19 public database (offered by the nation's health protection agency CDC) and from the consumer database (offered by American Marketing Association). Thus, the obtained data is secondary data.

True

False