Select all the true statements. 1 - Three dimensional (3D) composite shapes are made of two or more shapes put together.

2 - To calculate the surface area of a 3D composite shape, find the outside surface area of each shape and then add the surface areas together.

3 - Surface area is the amount of space, measured in cubic units, that an object or substance occupies

4 - Surface area is the sum of the areas of all faces (or surfaces) on a 3D shape.

Agroup of student volunteers participates in a study designed to assess several behavioral interventions for improving output in a repetitive task. prior to the beginning of the study, all volunteers unknowingly observed, and their output is measured. at the beginning of the study, prior to any intervention, the volunteers perform the same task under the observation of a study administrator, and their overall output increases. which of the following terms describes this phenomenon? a. simpson's paradox b. hawthorne effect are d. novelty effect d. pygmalion effect e. observer-expectancy effect