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Construct a 95% confidence interval about the slope of the true least-squares regression line for the data below, given that the predicted value of y

Construct a 95% confidence interval about the slope of the true least-squares regression line for the data below, given that the predicted value of y = -2.5x.
Be sure to follow formatting x.xxx,x.xxx

x -1 -2 -3 -4
y 2 6 7 10

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