Diet and blood pressure An experiment that showed thatsubjects fed the DASH diet were able to lower their bloodpressure by an average of 6.7 points compared to a groupfed a “control diet.” All meals were prepared by dieticians.a) Why were the subjects randomly assigned to the dietsinstead of letting people pick what they wanted to eat?b) Why were the meals prepared by dieticians?c) Why did the researchers need the control group? If theDASH diet group’s blood pressure was lower at theend of the experiment than at the beginning, wouldn’tthat prove the effectiveness of that diet?d) What additional information would you want to knowin order to decide whether an average reduction inblood pressure of 6.7 points was statistically significant?
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
Diet and blood pressure An experiment that showed that
subjects fed the DASH diet were able to lower their blood
pressure by an average of 6.7 points compared to a group
fed a “control diet.” All meals were prepared by dieticians.
a) Why were the subjects randomly assigned to the diets
instead of letting people pick what they wanted to eat?
b) Why were the meals prepared by dieticians?
c) Why did the researchers need the control group? If the
DASH diet group’s blood pressure was lower at the
end of the experiment than at the beginning, wouldn’t
that prove the effectiveness of that diet?
d) What additional information would you want to know
in order to decide whether an average reduction in
blood pressure of 6.7 points was statistically significant?
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