Biostatistics, hypothesis, need for hypothesis, formulation of hypothesis, steps in hypothesis testing, types of hypothesis, errors of hypothesis, different types of hypothesis testing, p-value, confidence interval, level of significance, power of study, power of test, degree of freedom, statistical tests, difference between statistics and parameter, criteria for hypothesis testing, clinical versus the statistical significance of HT, null hypothesis, alternate hypothesis, alpha and beta error in hypothesis testing, type I and type II errors, statistical estimation of confidence intervals