(Answered) Is the ATM scenario a one-tail on two-tail hypothesis test?Is the ATM scenario a one-tail on…

➤ Why choose a one-tailed test when checking if an ATM underpays customers?
Choose a one-tailed test when your hypothesis specifies a single direction, such as verifying underpayment. It places the rejection region on that side and increases power to detect that effect. Remember it ignores opposite deviations and must be decided before you collect or inspect data.