Claucoma is a leading cause of blindness in the United State

Claucoma is a leading cause of blindness in the United States. N. Ehlers measured the corneal thickness of eight patients who had glaucoma in one eye but not in the other. The following are the data on corneal thickness, in microns. At the 10% significance level, do the data provide sufficient evidence to conclude that mean corneal thickness is greater in normal eyes than in eyes with glaucoma? (S_d = 10.74)

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