Experiment 1: a student did a test to see if ultraviolet light
slows plant growth. she followed a logical method and
used a control group and experimental groups. she
repeated her experiment several times and found each
time that plants grow a little more slowly with ultraviolet
light.
experiment 2: a student did a test to see if a new fertilizer
makes roses bloom earlier. she followed a logical method
and used a control group and experimental groups. she
performed one experiment and found that the fertilizer had
no effect.
which experiment is more likely to be reliable, and why?