A Sample of 30 Clock Radios Is Selected in Sequence

Essay

A sample of 30 clock radios is selected in sequence from an assembly line. Each radio is examined and judged to be acceptable (A)or defective (D). The results are shown below. Test for randomness. $\begin{array}{cccccccccc}\mathrm{A} & \mathrm{A} & \mathrm{D} & \mathrm{A} & \mathrm{A} & \mathrm{A} & \mathrm{D} & \mathrm{A} & \mathrm{A} & \mathrm{D} \\\mathrm{A} & \mathrm{D} & \mathrm{A} & \mathrm{A} & \mathrm{A} & \mathrm{D} & \mathrm{A} & \mathrm{A} & \mathrm{A} & \mathrm{A} \\\mathrm{A} & \mathrm{A} & \mathrm{D} & \mathrm{D} & \mathrm{A} & \mathrm{A} & \mathrm{A} & \mathrm{A} & \mathrm{D} & \mathrm{A}\end{array}$