You are given the following information about y and x. 
The least squares estimate of the slope or b1 equals
Definitions:
Point Estimate
A single value given as an estimate of a population parameter, often derived from sample data.
Population Parameter
A numerical value that characterizes a given population, such as mean or standard deviation.
Sample Statistic
A numerical measure calculated from a sample data set used to estimate characteristics of the population from which it is drawn.
Unbiased Estimator
A statistical estimator that, on average, accurately estimates the parameter of interest.
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