Eye refractive study. Refer to the Optometry and Vision Science (June 1995) study of refra...

Eye refractive study. Refer to the Optometry and Vision Science (June 1995) study of refractive variation in eyes, presented in Exercise 2.67 (p. 61). The 25 cylinder power measurements are saved in the LEFTEYE file.

a. Find the 10th percentile of cylinder power measurements. Interpret the result.

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b. Find the 95th percentile of cylinder power measurements. Interpret the result.

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c. Calculate the z-score for the cylinder power measurement of −1.07. Interpret the result.

Exercise 2.67