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.
We can also use either Excelâs t-Test: Paired Two Sample for Means data analysis tool or the T Test and Non-parametric Equivalents supplemental data analysis tool to get the same result. The output from the Excel data analysis tool is shown in Figure 4.e summarize the results from the two analyses as follows: Figure 7 â Comparison of paired and independent sample t tests. Note that the mean differences are the same, but the standard deviation for the paired sample case is lower, which results in a higher t-stat and a lower p-value.