23. Safety Programs Data were collected on lost-time accidents (mean work-hours lost per month over a period of 1 year) before and after an industrial safety program was put into effect at six industrial plants. Do the data provide sufficient evidence to indicate whether the safety program was effective in reducing lost-time accidents? Test using a =.01

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Plant Number 1 2 3 4 5 6 Before Program 38 64 42 70 58 30 After Program 31 58 43 65 52 29