The main objective of the Purva Mimamsa school was to establish the authority of the Vedas. Consequently, this school's most valuable contribution to Hinduism was its formulation of the rules of Vedic interpretation. Its adherents propounded unquestionable faith in the Vedas and regular performance of the yajas, or fire-sacrifices. They believed in the power of the mantras and yajas to sustain all the activity of the universe. In keeping with this belief, they placed great emphasis on dharma, which consisted of the performance of Vedic rituals.

The main objective of the Purva Mimamsa school was to establish the authority of the Vedas.

The main objective of the Purva Mimamsa school was to establish the authority of the Vedas. Consequently, this school's most valuable contribution to Hinduism was its formulation of the rules of Vedic interpretation. Its adherents propounded unquestionable faith in the Vedas and regular performance of the yajas, or fire-sacrifices. They believed in the power of the mantras and yajas to sustain all the activity of the universe. In keeping with this belief, they placed great emphasis on dharma, which consisted of the performance of Vedic rituals.

Yes

It is a philosophical school

Mimamsa is a Sanskrit word meaning "investigation, inquiry, discussion." The term was applied to one of the six Hindu philosophical darsanas, viewpoints. In this context Mimamsa would have fully meant "the investigation of the proper interpretation of the Vedic texts." The Mimamsa school is better known as the Purva Mimamsa school, meaning the Prior School of Investigation, because it is concerned with the earlier or prior section of the Vedas. Vedanta is alternatively called Uttara Mimamsa as it studies the later (uttara) part of the Vedas. Purva and Uttara are not only chronological terms but can be applied in a theological way with Purva as religiously basic and Uttara as religiously superior. Purva Mimamsa is sometimes called Dharma Mimamsa as it is an investigation into the dharma established by the Vedas. Another name is Karma Mimamsa because it is primarily concerned with sacrifice (karman).
Dharma is a key word in Mimamsa doctrine, being used in the sense of sacred and moral d ...more

Wiki says -The Prva Mms school traces the source of the knowledge of dharma neither to sense-experience nor inference, but to verbal cognition (i.e. knowledge of words and meanings) according to Vedas.