Intro To Biostatistics
                     BIOSTATISTICS
INTRODUCTION
Biostatistics is the term referred to when 
tools of statistics are applied to the data 
that is derived from biological sciences. In 
other words, when the principles of 
statistics are applied to the study of 
organisms or living systems, the study is 
called biostatistics or biometry. 
SOURCE: plantlet.org
DESIGN OF BIOLOGICAL 
EXPERIMENTS
It encompasses the design of biological 
experiments, especially in medicine, 
pharmacy, agriculture, and fishery; the 
collection, summarization, and analysis of 
data from those experiments; and the 
interpretation and inference from the 
obtained results.
SOURCE: plantlet.org
Physiology and 
Anatomy
To define normal or healthy in a population 
and find limits of normality in variables 
such as weight & pulse rate.
SOURCE: plantlet.org
Physiology and 
Anatomy Cont.
To find the difference between means and 
proportions of normal at two places or in 
different periods. The mean height of 
Bangladeshi boys is less than the mean 
height of American boys. Whether this 
difference is due to chance or a natural 
variation or because of some other factors 
such as better nutrition playing a part, has 
to be decided.
SOURCE: plantlet.org
Pharmacology
To find the action of a drug. For example, a 
drug given to animals or humans to see 
whether the changes produced are due to 
drug or by chance
SOURCE: plantlet.org
Medicine
To compare the efficacy of a particular 
drug, operation, or line of treatment. 
For example, the percentage cured, 
relieved, or died in the experiment & 
control groups is compared & the 
difference due to chance or otherwise is 
found by applying the statistical technique.
SOURCE: plantlet.org
Community Medicine 
& Public Health
To test the usefulness of vaccines in the 
field – the percentage of attacks or deaths 
among the vaccinated subjects is 
compared with that among the non-
vaccinated ones to find whether the 
difference is observed as statistically 
significant.
SOURCE: plantlet.org
Epidemiological 
Studies 
In epidemiological studies – the role of 
causative factors is statistically tested. The 
deficiency of iodine as an important cause 
of goiter in a community is confirmed only 
after comparing the incidence of goiter 
cases before and after giving iodized salt.
SOURCE: plantlet.org
Thank you