The symptoms of a sty are. foreign body sensation in the eye (particularly with blinking), eye pressure, and; pain in the area of the bump, though often they are painless. There may also be blurred vision if thick sebum or pus from within the sty spreads over the eye's surface. If chronic meibomian gland dysfunction is present, dry eye symptoms are common.
Paired t-test. This tutorial will walk you through the use of the paired t-test. The paired t-test should be used when the data are in pairs. One of the most common uses of this test is a before- and after- (pre and post) analysis. For example, we might be interested in how much a certain group grows after fertilizer is added to randomly selected plots.
Purpose, Assumptions. The t-test is the most commonly used method to evaluate the differences in means between two groups. For example, the t-test can be used to test for a difference in test scores between a group of patients who were given a drug and a control group who received a placebo.