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. The data can be found in the file Glaucoma.sav. Use ? = .05.
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. The data can be found in the file Glaucoma.sav.
Use ? = .05.
a) 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. Which test would i use in spss and what data would i conclude with?
b) Conduct a hypothesis test to determine if there is sufficient evidence to
conclude that corneal thickness is different in normal eyes compared to eyes
with glaucoma? Write up your results using the 8 steps.
Which test would i use in spss and what data would i conclude with?
c) Write a report summarizing your findings from part b). When writing the
report consider that medical staff estimate that a difference of 4.5 microns
or more could impact on their ability to interpret eye pressure correctly.
Which test would i use in spss and what data would i conclude with?
d) Define for the hypothesis stated in part b) what a type 1 error and type 2
error would mean. Is it possible that we could have committed a type 2 error
in conducting the test in part b)?
Which test would i use in spss and what data would i conclude with?
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