Probability could be objective or subjective. Byestherom is a formula to
calculate conditional Probability. The sample methods of random sampling are simple
random sampling, systematic random sampling, Stratified random sampling, and
cluster random sampling. Use of hypothesis testing, if used as inferential statistics,
definite steps are required to be followed. Using confidence intervals as inferential
statistics provide more useful information in clinical research. This chapter
incorporates a discussion on these aspects.