Use the Following Information for Questions

Multiple Choice

Use the following information for questions:
A manufacturer of cell phones is interested in evaluating two alternative existing layout and flow path designs. Design 1 is the current one in use and Design 2 is a new proposed plan. Both designs were implemented for eight consecutive working days and the output of each design was recorded.
-What are the degrees of freedom for this paired design analysis?

A) 8 (since there are eight days) .
B) 16 (since there are 16 observations in all) .
C) 15
D) 7