A quality-control inspector tracks the compressive strength of parts created by an injection molding process. If the process is in control, the strengths should fluctuate randomly around the target value of 75 psi. The inspector measures the strength of 20 parts as they come off the production line and obtains the following strengths, in order:
82.0, 78.3, 73.5, 74.4, 72.6, 79.8, 77.0, 83.4, 76.2, 75.2,
81.5, 69.8, 71.3, 69.4, 82.1, 77.6, 76.9, 77.1, 72.7, 73.6
Conduct a runs test for randomness of the compression strengths at the α = 0.05 level of significance. Should the quality-control inspector be concerned about the process?