# Inferential Statistics

Sometimes we must make decisions based on a limited set of data. For example, we would like to know the operating characteristics, such as fuel efficiency measured by miles per gallon, of sport utility...

Advantages and Properties of Regression Analysis

If the given bivariate data are plotted on a graph, the points so obtained on the scatter diagram will more or less concentrate around a curve, called the ‘curve of regression’. The mathematical equation...

Difference between Correlation & Regression

Correlation tells us about the relationship between two variables and indicates the degree and direction of their association, but fails to answer the following question. Is there any functional (or algebraic) relationship between two...

Judgemental Sampling-Explained with Examples

In judgemental sampling, the choice of sample items depends exclusively on the judgement of the investigator. This means that the investigator includes those sample points which he feels are representative of the population under...

Intraclass Correlation

Intraclass correlation(ICC) refers to the correlation within the groups or classes. It tells us how the members of a group are correlated with respect to a particular characteristic. The correlation between the heights of...

Partial Correlation

Sometimes the correlation between two variables X and Y may be caused because of the presence of an intervening variable Z. The partial correlation between the two variables X and Y tells us the...

One sample Z test

The one sample Z test is used to check whether the mean of a single population is equal to a particular value or not. The null hypothesis for our test is that the population...

Two Sample Z test

The two sample Z test is used to check for the equality of means for two populations. The null hypothesis for our test is that the two population means are equal. For example, suppose that...