How much noisier are streets where cars travel faster? The following table presents noise levels in decibels
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How much noisier are streets where cars travel faster? The following table presents noise levels in decibels and average speed in kilometers per hour for a sample of roads.
a. Compute the least-squares regression line for predicting noise level (y) from speed (x).
b. Construct a 95% confidence interval for the slope.
c. Test H0: β1 = 0 versus H1: β1 ≠ 0.
Can you conclude that speed is useful in predicting noise level? Use the α = 0.01 level of significance.
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