Final answer:
The weakness of meta-analysis is that not all sources of bias are always detected, potentially leading to incorrect conclusions.
Step-by-step explanation:
A weakness of meta-analysis is that sources of bias are not always detected. When conducting a meta-analysis, researchers compile and synthesize the findings of multiple studies on a specific topic to draw broader conclusions. However, biases in the individual studies due to sampling errors, publication bias, or study design can be carried over into the meta-analysis. If these biases are not detected, they can lead to incorrect conclusions being drawn. Therefore, the ability to detect all potential sources of bias in the group of studies being analyzed is an important consideration for ensuring the accuracy of a meta-analysis