Researchers at a university want to know if higher levels of nitrogen in fertilizer will increase the
production of tomatoes per plant. twenty plants are given normal levels of nitrogen and twenty
other plants are given ten percent higher levels throughout the growing season. the plants
receive the same levels of sunlight, water and are planted in the same soil on one farm. at the
end of the experiment the average number of tomatoes produced is the same for each group.
the scientists repeat the experiment on two additional farms further south that season. the
researchers conclude that increasing nitrogen levels by 10% in tomatoes is not beneficial.

would this be a well-designed, reliable experiment? support your decision with at least three
reasons.