H0: the average household's monthly income does not change from 25000 baht: m = 25000. The average income per month: H1 of the household changes from 25000 baht: m = 25000.
H0: The average monthly household income was unchanged from 25000 THB: m = 25000 H1: The average monthly household income went from 25,000 THB: m = 25000.