The General Social Survey (GSS) is a survey on a random sample of U.S. adults that gathers data on a variety of variables to understand the attitudes of Americans. In the 2018 GSS, respondents were asked if they thought mothers working hurt children (coded as yes or no). Of the 1,550 people asked the question, 400 said yes. We want to estimate what this proportion is for the population.

Calculate the relevant sample statistic and use the correct notation?