An engineer wishes to know which innovation afforded the greater improvement in
ID: 1360170 • Letter: A
Question
An engineer wishes to know which innovation afforded the greater improvement in efficiency of the bicycle: The introduction of narrow gauge tires or the introduction of multiple sprockets. She designed an experiment using three groups of volunteers. Group 1 rode bicycles with narrow gauge tires and without multiple sprockets, Group 2 rode bicycles with wide gauge tires and without multiple sprockets, and Group 3 rode bicycles with wide gauge tires and multiple sprockets. Which group constitutes the control in her experiment?
A) Group 1 and 3 together
B) Group 3
C) Group 1
D) Group 2
Explanation / Answer
I think it will be group 1 and 3 together.
Group 2 rode bicycles with wide gauge tires and without multiple sprockets but she want to the effeciency of narrow gauge. So this will noo be teh control in her experiment