Correlation is a statistical measure that describes the strength and direction of a linear relationship between two variables. It is quantified using the correlation coefficient, which ranges from -1 to 1. A correlation coefficient of 1 indicates a perfect positive linear relationship, while -1 indicates a perfect negative linear relationship. […]
The chi-square test is a statistical method used to determine if there is a significant association between two categorical variables. It compares the observed frequencies in each category with the expected frequencies if there were no association. The test calculates the chi-square statistic, which measures how much the observed frequencies […]
The arithmetic mean, commonly referred to as the mean, is a measure of central tendency that represents the average value of a dataset. It is calculated by summing all the values in the dataset and then dividing by the number of values. For example, in the dataset [2, 4, 6, […]
Regression is a statistical method used to analyse the relationship between two or more variables. It helps determine how the dependent variable changes when one or more independent variables are modified. The most common form is linear regression, where the relationship is modelled with a straight line (y = mx […]
Standard deviation is a statistical measure that quantifies the amount of variation or dispersion in a set of data values. It indicates how much individual data points differ from the mean (average) of the dataset. A low standard deviation means that the data points are close to the mean, while […]