Since 1966, 45% of the No.1 draftpicks in the NBA have been centers.

identify the population
A. all No.1 draftpick centers in the NBA since 1966
B. all NBA players since 1966
C. all No.1 draftpicks in the NBA since 1966
D. None of the above


identify the specified attribute
A. being a center
B. being an NBA player
C. being a No.1 draftpicks in the NBA
D. None of the above


is the proportion 0.45 (45%) a population proportion or a sample proportion?
A. sample proportion
B. population proportion
C. None of the above