What are the independent variable and the dependent variable?

A tissue manufacturer that has the fourth-largest market share plans to experiment with a 50 cents off coupon during November and a buy one, get one free coupon during December. The experiment will take place at Target stores in St. Louis and Kansas City. Sales will be recorded by scanners from which mean tissue sales for each store for each month can be computed and interpreted.

* What are the independent variable and the dependent variable?
* Prepare a “dummy” table that would describe what the results of the experiment would look like.

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Sketch the load characteristics, terminal voltage/load current, of the following types of DC generator

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what happens if the resistance in series with the shunt field of a DC motor is increased in value

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