Es A city planner is studying the need for affordable housing in the city's Urban Planning Department. He learned from the census of all 75,342 households in the city that the median family income is $65,000, with an average of 2.9 persons-per-household, and 88% live in a single household unit. Previously, the planner had surveyed a group of 400 randomly selected households in the city. The surveyed households had a median family income of $52,000, an average of 3.2 persons-per-household, and 80% lived in a single household unit. (a) For city planner's survey, identify the population and the sample. X 5 Population: All the households in the city Sample: The group of 400 randomly selected households (b) Choose whether each number described below is a parameter or a statistic for the city planner's survey. Number Parameter Statistic The $65,000 median family income of all the households in the city The average of 2.9 persons-per-household of all the households in the city The 80% of the group of randomly selected households that live in a single household unit