Answer:
comparing how often the predictions come true to what would be expected by pure chance.
Explanation:
Astrology is a pseudoscience that studies the celestial bodies and the probable relationships they have with people's lives and events on earth. Astrologers - individuals who practice astrology - use information about the position of the Solar System planets, constellations, and other motions of celestial bodies to supposedly predict the future or profile the personality of people.
The astrology practiced by those who cast predictive horoscopes can be tested by comparing how often predictions come true for what would be expected by pure chance.
