This article, from WebMD, is from 2003 but the three tests still apply:
WebMD You Could Diagnose Stroke
. . . Brice and her colleagues measured the accuracy of the test by first teaching it to 100 healthy bystanders. The bystanders then performed the test on stroke survivors. To diagnose a stroke, the bystanders performed the following three steps:
1. Bystander told the patients, "Show me your teeth." The "smile test" is used to check for one-sided facial weakness -- a classic sign of stroke.
2. Then the patients were told to close their eyes and raise their arms. Stroke patients usually cannot raise both arms to the same height, a sign of arm weakness.
3. Finally, the patients were asked to repeat a simple sentence to check for slurring of speech, which is another classic sign of stroke. "In Cincinnati, the researchers asked patients to say, 'The sky is blue in Cincinnati,'" says Brice. But in the study, the researchers varied four simple phrases such as "Don't cry over spilled milk.". . . .
"This is so simple that even a child could use it. Look at how many children have saved their parents by doing CPR, and this is so much simpler," says Kenton. He says he thinks the test should be promoted for use by the general public.
Brice agrees with this assessment, saying that it could be like the Stop, Drop and Roll campaign to avoid burn injuries. "We call it: Talk, wave, smile."
