A photographic company has developed a new spray coating that, hypothesized, it will increase the longevity of photograp

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A photographic company has developed a new spray coating that,
hypothesized, it will increase the longevity of photographic prints
made in Inkjet printers. A large-scale experiment to investigate
this I would try to control the variation of a number of sources:
the brand of paper (Canon, Epson, Ilford, etc.); the type of paper
(glossy, matte, etc.); the type of ink (pigment or dye-based); the
brand of printers; and so on. Before undertaking this experiment to
large scale, which would be very expensive, the company decides to
do a preliminary experiment focused on a combination of factors
only. The preliminary experiment consists of selecting 20 random
packages (of different lots) of Ilford Gallerie Classic Pearl
Inkjet Photo Paper. From each box two sheets of paper are randomly
selected and identical prints are made on each sheet (with the same
printer and ink). One of these two prints is randomly selected and
sprayed with the new coating, while the other impression is left
alone. All 40 prints The resulting results are subjected to
accelerated aging and the difference in longevity (in years)
between treated and untreated impressions of each box. The
following questions refer only to the preliminary experiment:
a) What type of experimental design is this?
b) What is the population?
c) What role does randomization play?
d) Is there a lock variable? If so, what happens?