For general-purpose applications, a 15A or 20A "duplex receptacle" is permitted on a 20A branch circuit, see NEC Table 210.21(B)(3). This is because the internal components of a 15A receptacle are identical to a 20A receptacle. https://www.youtube.com/watch?v=QYfhBUqmgnI. There is no need to install an expensive 20A, 125V duplex receptacle on a 20A circuit, unless the equipment has a T-Slot attachment plug at the end of the cord (not likely). As for me and my house, I will serve the Lord [Joshua

#88 Cramer-Rao lower bound(CRLB), efficient estimators, MVUE, example