What are the four main types of data, and can you provide examples for each?

Here are four types of data:

I. Qualitative data: This type of data describes qualities or characteristics and cannot be measured numerically. Examples include colors, textures, or opinions.
II. Quantitative data: This type of data consists of numerical values that can be measured or counted. Examples include age, height, or the number of items.
III. Primary data: This is data collected directly by the researcher for a specific purpose. Examples include survey responses or experimental results.
IV. Secondary data: This is data that has been collected by someone else and is available for use by others. Examples include government census data or published research papers.