Discuss the differences between the concepts of correlation and causality.

Please answer as Q&A only:

1. Discuss the differences between the concepts of correlation and causality. Why is it critically important to make sure that the differences are understood?

2. There is some concern about a growing number of research studies that cannot be reproduced. Describe the implications this has for the research community as a whole. Include the steps that can be taken in order to try to mitigate this growing concern.