Data are collected on the weekly expenditures of a sample
Data are collected on the weekly expenditures of a sample of urban households on food (including restaurant expenditures). The data, obtained from diaries kept by each household, are grouped by number of members of the household. The expenditures are as follows:
a. Compute the mean expenditure separately for each of the five groups.
b. Combine the five data sets into a single data set and then compute the mean expenditure.
c. Describe a method by which the mean for the combined data set could be obtained from the five individual means.
d. Describe the relation (if any) among the mean expenditures for the five groups.
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