I believe the answer is: <span>formal operational
During </span>formal operational stage, most people would started to develop the ability to develop abstract concept which granted us the ability to create a hypothesis. On average, <span>formal operational stage happen when we're around 12 years old or older.</span>
The correct answer is case study.
A case study is a method of psychological research that involves collecting in-depth information and data about an individual person or animal. Information gathered from case studies can be from a combination of questionnaires, interviews, observations etc. Case studies can be conducted when investigating any psychological phenomena, however, they are most useful when investigating psychological or mental disorders.
Identify by price range the areas on the demand curve where demand is elastic, inelastic, and unit elastic using the attached graphs for Elasticity of Demand, Total Revenue.