Given the sequence of data, if we fail to reject randomness, does it follow that the sampling

Question:

Given the sequence of data, if we fail to reject randomness, does it follow that the sampling method is suitable for statistical methods? Explain.
Use the following sequence of political party affiliations of recent presidents of the United States, where R represents Republican and D represents Democrat.
R R R R D R D R R R D R R R D D R D D R R D R R D R D