The calculation of the number of samples was calculated based on the Slovin formula [10-12], and resulted the
minimum sample size of Semarang was 400 families, consisting of 109 families for the District of Pedurungan
(upper economic strata), 129 households for the District of West Semarang (middle economic strata), 77 families for
the District of North Semarang (lower economic strata), and 85 families for the District of Banyumanik (topography
of the plateau region).