Can you explain to me what are:
Indepedant variables
Dependant variables
a control
and why a control is necessary
thanks|||The dependent variable is your outcome measure, that is "dependent" on the influence of the independent variables. For example, "the height of a plant after 30 days (dependent variable), as affected by the (independent) variables: hours of sunshine per day, quantity of water per day, and amount of fertilizer per day".
A control is necessary as a reference against which you compare your experimental group. So, for the same example, your hypothesis is that increasing the number of hours of sunshine will affect plant growth, and you will measure this by the height of the plant after 30 days. The control group would get a standard light exposure, and your experimental group would get more light exposure. After 30 days, you would compare the plant height in the control group against the plant height in the experimental group.
The regression equation looks at the combined influence of the independent variables (sun, water, fertilizer) on the dependent variable (plant height). A regression equation tells you if the plant height is a function of these variables, and also helps you determine which variable has the greatest effect on plant height.
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