hte ratio of net operating income to property asset valuelong dashcalled the capitalization ratelong dashwas determined for a sample of $13$ retail property tenants. Data on$$ S&P credit ratings and$5-$year capitalization rates for the $13$ tenants are provided. An appraiser wants to compare the mean$5-$year capitalization rate of all$$ single$-$property retail tenants with low $($BBBminus$)$S&P rates with the corresponding mean for high$($A$,$ AAminus$,$ or$$ AA$)$ S&P ratings.$($Since the low$$ S&P rates are mentioned$$ first, treat them as the first$$ sample.$)$ Complete parts a through f below