Statistics. Need help deciding which of these situations is a paired t-test or two sample t-tests?
How do you figure out which situation is a paired t-test or a two-sample t-test? My mind is drawing a blank on this.
1) Mass of 15 patients before and after surgery.
2) Number of cigars smoked per day by 18 women who have had strokes compared to the number smoked by 18 women who have not.
3) Mercury concentration upstream from five plants compared to the levels downstream from the same plants.
4) Rates of alcohol consumption of 27 men before and after a stroke.
1) Same people, paired.
2) Different people, two sample.
3) Different. Two sample.
4) Same people. Paired.
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