Dependent variable will be measured and collected

A brief description of the theory/hypothesis (that is, whether you think that a fast or slow – or something else – tempo will increase sales. It would also help if you could explain what ‘fast’ and slow’ meant. B) A description of the independent (influencing/causing) and dependent (influenced/’caused’) variables. How the independent variable will be changed. And how the dependent variable will be measured and collected. C) How you will ensure that the study will include sufficient data to not be subject to random negative effects (that the only time a slow tempo is measured is a rainy night in February).