# Question

A study in Physical Therapy reports on seven different methods to determine proper crutch length plus two new techniques using linear regression. One of the regression techniques uses the patient’s reported height. The study included 107 individuals. The mean of the self-reported heights was 68.84 inches. The regression equation determined was y = 0.68x + 4.8 where y = crutch length and x = self-reported height. The MSE was reported to be 0.50. In addition, the standard deviation of the self-reported heights was 7.35 inches. Use this information to determine a 95% confidence interval estimate for the mean crutch length for individuals who say they are 70 inches tall.

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