One-Sample Statistics N Mean 8 Std. Deviation Std. Error Mean 10.74377 3.79850 One-Sample Test Significance One-Sided p Two-Sided p 7 164 .327 One-Sample Effect Sizes Corneal thickness difference (normal- glaucoma) microris Corneal thickness difference (normal- glaucoma) microns Standardizer Point Estimate 10.74377 Cohen's d 372 Corneal thickness difference (perreal- Hedges correction 12.09607 .331 diaucoma) microns a. The denominator used in estimating the effect sizes. Cohen's d uses the sample standard deviation. Hedges' correction uses the sample standard deviation, plus a correction factor. t 1.053 4.0000 df Test Value = 0 Mean Difference 95% Confidence Interval of the Difference Lower Upper 4.00000 95% Confidence Interval Lower Upper -.359 -.319 1.079 .958 -4.9820 12.9820
Glaucoma is a leading cause of blindness in the United States, N. Ehlers measured
the difference in corneal thickness (in microns) between the two eyes of eight patients.
Each patient had one eye that had glaucoma and one eye that was normal. The
difference was measured as the corneal thickness of normal eye – corneal thickness
of eye with Glaucoma. Corneal thickness is important because it can mask an
accurate reading of eye pressure.
Question:
If a participant has the same corneal thickness in their normal eye as the
eye with Glaucoma, what would be the value for difference: measured as
the corneal thickness of normal eye – corneal thickness of eye with
Glaucoma.
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