The article Drift in Posturography Systems Equipped with a Piezoelectric Force Platform: Analysis and Numerical Compensation (L.

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The article €œDrift in Posturography Systems Equipped with a Piezoelectric Force Platform: Analysis and Numerical Compensation€ (L. Quagliarella, N. Sasanelli, and V. Monaco, IEEE Transactions on Instrumentation and Measurement, 2008:997€“1004) reported the results of an experiment to determine the effect of load on the drift in signals derived from a piezoelectric force plate. The correlation coefficient y between output and time was computed for various loads x in kN, as shown in the following table.

х y 0.196 -0.9710 0.245 0.294 -0.9735 -0.9694 0.343 -0.9684 0.392 -0.9624 0.441 -0.9688 0.490 -0.9519 0.539 -0.9573 0.5


a. Compute the least-squares line for predicting y from x.

b. Plot the residuals versus the fitted values. Does the least-squares line seem appropriate?

c. Compute the least-squares line for predicting y from x2.

d. Plot the residuals versus the fitted values. Does the least-squares line seem appropriate?

e. For each model, find a 95% confidence interval for the mean value of y when x = 0.32. Are the confidence intervals similar?

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