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aore baking broken lines cent level cent point coefficient of correlation coefficient of determination construction correlation coefficient correlation index dishwashing distribution of F eerved error of estimate factors finally families figure 11 finally chosen fires food preparation graph figure HOUSEHOLD AND AVERAGE index of correlation index of determination individual meals served level of significance linear correlation lino loads lunch pails minutes Number of articles Number of lunch Number of meals number of persons number of record oare obtained original work unit PAILS PACKED plotted present study range of error rango relation relationship relinbility standard error taak Talue teeted tested tha number thie total number tr.e uait unit graph variance accounted variations varinnce ratio washing WEEK The range weok work-unit graph work-unit line workers youngest person