For Questions , Use the Following Narrative

question 7

Essay

For Questions , use the following narrative
Narrative: Marijuana and brain
Researchers at the University of Iowa College of Medicine reported that a test showed those who smoked seven or more marijuana joints per week had lower math scores than non-marijuana users.A related headline says "New study confirms too much pot impairs brain".
-{Narrative: Marijuana and brain} Explain why these results must have been based on an observational study, and not an experiment.

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Definitions:

Indirect Materials

Materials used in the production process that do not become an integral part of the final product and are not directly assignable to specific units produced.

Manufacturing Overhead

All indirect costs associated with manufacturing beyond direct materials and direct labor.

Raw Materials

Basic materials and substances used in the initial stages of production before being transformed into finished products.

Job-Order Costing

A costing method that assigns costs to specific production batches or jobs.