1. While testing if randomization works in the RocketFuel case, we compared the average number of impressions of the treatment group to the average number of impressions of the control group using a two-sample t-test. If the p-value (two-tail) of the test was 0.53, what conclusion would you draw?

		Randomization in the experiment did not work.
		There is NO significant difference in the success metric (i.e., conversion rate) between treatment and control groups.
		Randomization in the experiment worked.
		The treatment group wins.

2.The higher the internal validity, the higher the external validity.

True

False

3. In A/B testing, success metrics (e.g., web traffic, number of clicks) should be treated as independent variables.

True

False

4. Focus-group might be used in the process of research conceptualization.

True

False