An engineer wishes to know which innovation afforded the greater improvement in

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

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