# Blog

### The power of a test

The power of a test is the probability of detecting a statistically significant effect when one actually occurs in the population under study.

### SKEWNESS AND KURTOSIS

Kurtosis and skewness are measures of asymmetry that describe such properties as the shape and asymmetry of the distribution under analysis. They provide us with information on...

### Quantiles, quartiles, percentiles (measures of location)

We use quantiles to determine the position of a given value against others in a group or population. Let's say you have received the results of your matriculation exams in...

### STUDENT T-TESTS

The Student's t-test group is used to compare two groups of results, measured by the arithmetic mean, against each other.

### PEARSON'S CHI-SQUARE TEST OF INDEPENDENCE

The chi-square test of independence is one of the most popular statistical tests. It is used to check whether there is a statistically significant relationship between two...

### Customer Satisfaction Index (CSI)

The Customer Satisfaction Index (CSI) is a method used in marketing to evaluate client satisfaction derived from products or services being provided by a company or organisation.

### Customer Effort Score (CES)

Customer Effort Score (CES), along with Net Promoter Score (NPS), and Customer Satisfaction (CSAT), is one of the key indicators related to clients' satisfaction. All these three...

### Scatter Plot

A scatter plot (also referred to as a scatter graph) is a plot with two perpendicular axes, where two variables are presented.

### Column chart, bar chart and histogram

Column and bar charts have long been some of the most popular ways to visualize data. Before you decide to use any of them, it's worth taking a closer look at them.

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