Final answer:
Meta-analysis is a type of study that involves collecting and statistically analyzing the results from many previous studies to gain greater confidence in the accumulated findings.
Step-by-step explanation:
The type of study that involves collecting the results from many previous studies and statistically analyzing them in a way that allows for greater confidence in the accumulated findings is called meta-analysis. Meta-analysis is a technique in which the results of virtually all previous studies on a specific subject are evaluated together. It provides a comprehensive and objective assessment of the existing evidence and helps to identify patterns or trends that may not be apparent in individual studies.