STAT 2200 QUIZ #3T. DeWees
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1. ( 10 points ) So 10 people walked into a bar, I measured there pupil dilation and they averaged 2.45 mm with
a standard deviation of 0.27 mm. I sampled a different 10 people as they left the bar after a few drinks. They
had an average pupil size of 2.18 mm with a standard deviation of 0.22 mm. Does alcohol affect pupil size at
the α= 0.05 level. Interpret.
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