Given the following information, what is the least squares estimate of the slope? 
Definitions:
Total Mean
The overall average of a set of numbers or measurements, calculated by summing all the values and dividing by the number of observations.
Total Mean
The overall average of a set of numerical values computed by summing them up and dividing by the count of numbers.
Independent Variables
Variables in an experiment that are manipulated or changed to observe their effect on dependent variables, without being influenced by other factors in the experiment.
Interaction Effect
A phenomenon in statistical analysis where the effect of one variable on an outcome depends on the level of another variable.
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