In a stratum chart, the vertical distance between two lines represents the
a. amount of the upper line variable.
b. amount of the lower line variable.
c. sum of the upper and lower line variables.
d. difference of the upper and lower line variables.
e. None of these are correct.
Question 2
The responsibility for customer service resides only in the customer service department.
a. True
b. False
Indicate whether the statement is true or false
