An eye hospital treats a large number of patients who have one eye normal, and the other eye suffers from a thinning of the cornea. Seven such patients are randomly selected and the thickness of their cornea on their good eye and poor eye is measured, in micrometres.

Using a sign test, at the 10% significance level, investigate whether there is any difference in the thickness of the cornea between the two eyes.

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B C D. E Good eye 512 502 516 484 476 390 498 Poor eye 503 505 493 480 477 355 491