A real estate agent wants to know how much extra a fireplace adds to the price of a house. Sheselects 25 city blocks (Le., neighborhoods). In each block, she randomly chooses a house with areplace and one without and records the assessment value. Should we treat her houses asindependent or paired samples?

The data are paired. The houses are paired by fireplace design The data are paired. The houses are paired by city block (or neighborhood). ) Not paired. The data should be treated as independent. The samples are selected randomly from different neighborhoods. O Not paired. The data should be treated as independent. O None of the statements apply