19. It is a collection of information in the form of numerical/categorical figures*a. datab. questionnairec. surveyd. observation

Break Down the Problem

1. Identify the key term related to the question: "a collection of information in the form of numerical/categorical figures."
2. Analyze the provided options: a) data, b) questionnaire, c) survey, d) observation.

Relevant Concepts

1. Data: Refers to raw information, which can be numerical or categorical.
2. Questionnaire: A set of questions used to gather data but not the data itself.
3. Survey: A method of gathering information, typically using questionnaires, but still not the collection itself.
4. Observation: Involves collecting information through watching and does not necessarily result in numerical or categorical figures.

Analysis and Detail

1. Data fits perfectly with the definition provided in the question, as it explicitly refers to numerical or categorical figures.
2. A questionnaire does not describe the collection of information; it's merely a tool for data collection.
3. A survey can also be a method of collecting data, but like a questionnaire, it refers to the process rather than the data itself.
4. Observation is a method that might not result in numerical data and doesn’t align with the definition given.

Verify and Summarize

After analyzing the definitions, it's clear that the correct answer is the term that directly represents the collection of numerical or categorical figures.

Final Answer

The correct answer is a. data.