A dependent variable is a variable whose values depend on the values of another variable.

Here are the answers to the questions:

1.1.1. C
A dependent variable is a variable whose values depend on the values of another variable.

1.1.2. A
Fixed expenses are costs that do not change with the level of activity or over a period, such as rent or salaries.

1.1.3. B
Observation is a research method where researchers carefully watch and record behavior or characteristics without direct interaction.

1.1.4. C
A scatter plot graph is used to display the relationship between two quantitative variables, making it suitable for identifying patterns or the absence of patterns.