 # Biostatistics

## Experimental Designs (Part-1): Principle and Concept

For any scientific studies, designing and evolving suitable methodology of an experiment in an institution or for an inquiry in the field, need very logical and systematic planning. The knowledge of how experiments come in use and in what way it is to be carried out is discussed below.   …

## Test of Significance

Test of Significance The mathematical methods by which the probability of relative frequency of an observed difference occurring by chance, is found, are called tests of significance. It may be a difference between means or proportions of sample and universe or between the estimates of experiment and control groups.  Thus, …

## Comparison of Two Means: Student’s t-test

From the previous  topic, we learned about test of significance, a procedure for comparing observed data with a claim or hypothesis or predicted data. This test of significant is used to test e claim about an unknown population and for testing the research hypothesis against the H0. Null …

## Interrelationships of quantitative variables: Correlation and Regression

In the experiment, we measure the two continuous characters which are associated with each other. For example, the height of the plant and the temperature of the atmosphere. Accordingly, to understand the relationship between two such variables, we need to know how they are related and how the relationship can …

## Analysis of Variance and F test

We can test the significance of the two sample means by using a t-test. However, in cases where there are more than two samples, it is done by Analysis of Variance (ANOVA). This method is carried out by comparing sample variances using Variance Ratio Test or F test. So at …

## Measures of Dispersion

Range The range consists of a bunch of data that shows the distinction between the highest and lowest values among the data set. So as to seek out the range, it’s necessary to first order the data from lowest to highest. Then  we have to subtract the smallest value from the …

## Organisation and Presentation of Data

There are two main methods of presenting data of a variable character or a variable. A) Tabulation/Tabular Presentation B) Drawing/Graphical Presentation Tabulation Tabulation is a device for presenting data from a mass of statistical data. Preparation of frequency distribution table is the first requirement for that. Tables are often simple …

## Measures of Central Value: Mean, Median, Mode & Others

There are various methods to measure the central value of an observation. For instance, average, mean, median, mode, etc. Average The average value of a characteristic is the one central value around which all other observations are distributed. In any large series, nearly 50% of observations lie above the central …