Final answer:
The idea that an in-depth case study is not useful due to a lack of experimental control is false. Case studies provide valuable, in-depth insights into a subject even though their findings typically cannot be generalized to the larger population due to the absence of experimental controls.
Step-by-step explanation:
The statement that one of the disadvantages of an in-depth case study is that it does not involve enough experimental control to make a useful addition to the literature is false. While case studies may lack experimental control, their in-depth focus delivers a comprehensive understanding of a specific subject, which can lead to valuable insights and contribute meaningfully to the literature. However, a major limitation of case studies, as outlined in option c. of the reference question 7, is the inability to generalize the findings from this approach to the larger population.
Case studies provide a detailed examination of a single instance or a few instances in depth. This method allows researchers to explore complex issues in real-life contexts, particularly when boundaries between phenomenon and context are not clearly evident. The richness of the data collected through case studies can shed light on aspects of human behavior and social systems. However, it is indeed challenging to establish causality due to the lack of experimental controls.