Step 1: Concept
Philosophical data refers to information that deals with ideas, beliefs, values, and attitudes rather than physical or numerical measurements.
Step 2: Meaning
In contrast to empirical data which can be quantified or measured, philosophical data pertains to subjective concepts that are not easily numerically represented. These include abstract notions such as ethics, aesthetics, metaphysics, and epistemology.
Step 3: Analysis
Let's examine each option:
A) Measurable variables: This refers to quantities that can be directly measured using instruments or standardized methods. Philosophical data does not fit this category since it involves subjective concepts.
B) Quantifiable assertions: While philosophical arguments can be argued and debated, they are not typically quantified in the same way as scientific hypotheses. They involve more qualitative reasoning rather than quantitative analysis.
C) Numerical items: This option suggests that philosophical data is numerical or can be represented by numbers. However, philosophical concepts often cannot be directly translated into numerical values without losing their essence.
D) Ideas, beliefs, values and attitudes: These are the core components of philosophical data. Philosophers deal with abstract ideas, personal beliefs, societal values, and individual attitudes which do not lend themselves to direct measurement or quantification.
Step 4: Conclusion
Given that philosophical data encompasses subjective concepts such as ideas, beliefs, values, and attitudes, it is clear that option D best describes the nature of philosophical data.
Final Answer: (D)