Which of these experiments would make use of qualitative data?

a. a study of different shapes to compare rolling friction values
b. a study of different surfaces to compare ability to repel water
c. a study on the change in freezing point of water when salt is added
d. a study on the effects of sunlight on the growth rate of plants

The right option is; B. a study of different surfaces to compare ability to repel water.

A study of different surfaces to compare ability to repel water is the experiment that would make use of qualitative data.

Qualitative data is the type of data that deals with quality (properties) of a thing and not its quantity. Qualitative data cannot be measured, but it is obtained through methods of observations or by conducting interviews and it is usually recorded. Qualitative data can only be grouped by category, and not by numbers. Examples of qualitative data include; the skin colour of animals in a habitat, shape of cakes in various pack, and the tastes of different food substances.

The Mexican Revolution destroyed the old government and army of the dictator Porfirio Diaz, and eventually changed the country's economic and social system. The Mexican government recognized the labor unions and peasants organizations, and promoted their organization, and their incorporation into the state-party.