Evidence exists that pressure on the carotid arteries at the neck affects blood flow to the...

Evidence exists that pressure on the carotid arteries at the neck affects blood flow to the brain and eye. To find if tight neckwear affects visual functioning, Langan and Watkins (1987) measured critical flicker frequency (CFF) of men wearing loose (X1) and then tight (X2) neckties. CFF was measured in Hertz or cycles per second. Calculate the appropriate t-statistic. Your answer should round to the nearest whole number.

Loose	Tight
372	395
248	297
309	342
179	240
226	249

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orchestra answered 2 years ago

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