Only one use had a DOCSIS modem without a router. So that's an easy 99% or higher use a modem and router or nowadays a combo modem and router. Given the statistical sample size of 100 you can do your math on https://www.surveysystem.com/sscalc.htm to see if this is a high enough confidence value.
Hi, I'm doing research on home router deployments for my class, trying to get a grip on how many are used compared to (for example) docsis modems. I'm curious as to sales volumes of home router products year over year, and the structure of QOS/SQM systems. Are you using fq_codel (RFC8290) underneath? If not, what does it use?