Question

A civil engineer wants to determine the effects of velocity and water pressure on a water pump for a new apartment complex. Two velocities (20 mph & 15mph) and three water pressures (15 psi, 20 psi, 35 psi) were chosen for the study. Treatments were randomly assigned to 6 different water types.

a.         What are the experimental units?

                                 

b.         What is the response?

c.         Give the factors in the experiment.

d.         What are the treatments?

e.         What are some potential extraneous factors?

Answer 1

(a) Experimental Units: 6 different water types

(b) Response: Water pump for a new apartment complex

(c) The factors in the experiment:

(i) Velocity

(ii) Water pressure

(d) Treatments:

(i) Two velocities: 20 mph & 15mph

(ii) Three water pressures: 15 psi, 20 psi, 35 psi

(e) Potential extraneous factors:

The atmospheric pressure changes with height and hence the change in pressure that occurs over the pumping height is the pontial extraneous factor in this experiment.