=+3. The developer in Exercise 1 hires an assistant to collect a random sample of houses from each neighborhood and finds that the summary statistics for the two neighborhoods look as follows:

Neighborhood 1 Neighborhood 2 n1 = 30 n2 = 35 y1 = 57.2 yrs y2 = 47.6 yrs s1 = 7.51 yrs s2 = 7.85 yrs