You are the researcher of a retail chain that has 100 convenience stores in Canada.

The CEOs of the retail chain asks you: Would using technology to replace cashiers with self checkouts bring higher profits?

a) Please respond to the CEOs with the three questions to address / three steps to follow with regard to business experiments (general notes: 0.3 marks, application:

1.2 marks).

b) Explain the trade-off between internal and external validity (general notes: 0.1 marks, application: 0.4 marks).