Question: A work sampling study was performed on the day-shift maintenance department in a power generating station. The day-shift consists of five repair persons, each of

A work sampling study was performed on the day-shift maintenance department in a power generating station. The day-shift consists of five repair persons, each of whom works independently to repair equipment when it breaks down A total of 1250 observations (250 observations per repair person) were taken during a five week period (200 total hours of station operation). The observations were classified into one of the following categories: (1) maintenance person repairing equipment (2) maintenance person idle There were a total of 860 observations in category 1. It is known that 750 equipment repairs were made during the 5 weeks. (a) How many more observations would be required, if any, to be 95% confident that the true proportion of category 1 activity is within +0.05 of the proportion indicated by the observations? observations (b) Determine average time it takes a repair person to repair a piece of broken-down equipment minutes (c) How many hours of idle time per week is experienced by each repair person, on average? hours

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