Researchers who wanted to see if drinking grape juice could help people lower their blood pressure got 120 non-smokers t

[answerhappygod]

Researchers who wanted to see if drinking grape juice could help
people lower their blood pressure got 120 non-smokers to volunteer
for a study. They measured each person’s blood pressure and then
randomly divided the subjects into two groups. One group drank a
glass of grape juice every day while the other did not. After sixty
days, the researchers measured everyone’s blood pressure again.
They reported that differences in changes in blood pressure between
the groups were not statistically significant.
1. Was this an experiment or an observational study? Explain
briefly.
2. For each of the principles of experimental design
(Control, Randomize, Replicate, and Block), say whether it is
present in this scenario. Explain briefly.