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Data were collected on lost-time accidents (mean work-hours lost per month over a period of 1 year) before and after an indus

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Answer #1

S = Sqrt [ \sumD2 - n * (\sumD / n)2 / n-1 ]

= Sqrt[ (148 - 6 * (24/6)2 / 5) ]

= 3.2249

Test statistics

t = (\sumD / n) / ( S / sqrt(n) )

= (24/6) / (3.2249 / sqrt(6) )

= 3.0382

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