A real estate major collected information on some recent local home sales. The first 6 lines of the database appear below. The columns correspond to the house identification number, the community name, the zip code, the number of acres of the property, the year the house was built, the market value, and the size of the living area (in square feet).

a) What does a row correspond to in this data table? How would you best describe its role: as a participant, subject, case, respondent, or experimental unit?

b) How many variables are measured on each row?

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HOUSE_ID NEIGHBORHOOD MAIL ZIP ACRES YR BUILT FULL MARKET VALUE SFLA 413400536 Greenfield Manor 12859 1.00 1967 100400 960 4128001474 Fort Amherst 12801 0.09 1961 132500 906 412800344 Dublin 12309 1.65 1993 140000 1620 4128001552 Granite Springs 10598 0.33 1969 67100 900 412800352 Arcady 10562 2.29 1955 190000 1224 413400322 Ormsbee 12859 9.13 1997 126900 1056