1 Over the past decade, there has been a strong positivecorrelation between teacher salaries and prescription drugcost.
(a) Do you think paying teachers more causes prescription drugs tocost more? Explain.
(b) What lurking variable might be causing the increase in one orboth of the variables? Explain.
2 When we use a least-squares line to predict y values for xvalues beyond the range of x values found in the data, are weextrapolating or interpolating? Are there any concerns about suchpredictions?
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