Answer the following statement(s) true (T) or false (F)

1. Analysts must justify their choices about the conceptualization and operationalization of study concepts.
2. In conceptualization, no correct number of dimensions or variables exists, only bad or lacking ones.
3. The theorem of the interchangeability of indicators states that most concepts have three to five dimensions.
4. An index variable is a variable that combines the values of other variables into a single indicator or score.
5. Index variables are also commonly used to empirically measure abstract concepts and multifaceted, encompassing phenomena.

1.true
2.true
3.false
4.true
5.true