The dependent variable is always manipulated in the experimental group but never in the control group

When an individual purchases merchandise in a retail store using a credit or debit card which they insert into or swipe through a magnetic card reader, what type of electronic banking service are they using?

a. Automatic teller machines b. Point-of-sale terminals c. Electronic check conversion d. Automated clearinghouses

Which of following statements is true of short-term decision making?

A) Fixed costs and variable costs must be analyzed separately. B) All costs behave in the same way. C) Unit manufacturing costs are variable costs. D) All costs involved in a decision are considered relevant.