Data on family size xi and food expenditures yi over the course of the week of the survey are recorded for each family of a sample of 33 families from a large population of families. (a) Express food expenditures (for that week) per person in the population as a population quotient (ratio). (b) Using the sample data, we get : 33 33 33 33 33 S Ti = 123, S I = 533, [ yi = 2721.30, Ey? = 254196, E Tiyi = 10786.5 i=1 i=1 i=1 i=1 i=1 give an estimate and a C.I. (at about 95%) of food expenditures per capita in the population