Concrete expands both horizontally and vertically over time. Measurements of horizontal and vertical expansion (in units of
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Concrete expands both horizontally and vertically over time. Measurements of horizontal and vertical expansion (in units of parts per hundred thousand) were made at several locations on a bridge in Quebec City in Canada. The results are presented in the following table.
a. Compute the least-squares line for predicting vertical expansion (y) from horizontal expansion (x).
b. Construct a 95% confidence interval for the slope β1.
c. Test H0: β1 = 0 versus H1: β1 ≠ 0.
Can you conclude that horizontal expansion is useful in predicting vertical expansion? Use the α = 0.05 level of significance.
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