The management of Eastwood Manufacturing is concerned about the production of a special metal screw critical to several of the company's largest customers. The diameter of the screws is crucial to customer specifications. Five samples of the screw diameter have been collected, each with a sample size of 4. The question is whether the process is in statistical control.

\begin{tabular}{l|l|c|c|c} Sample Number & Sample 1 & Sample 2 & Sample 3 & Sample 4 \\ 1 & 0.5013 & 0.5025 & 0.5008 & 0.5022 \\ 2 & 0.5024 & 0.5040 & 0.5023 & 0.5021 \\ 3 & 0.5019 & 0.5027 & 0.5032 & 0.5024 \\ 4 & 0.5009 & 0.5033 & 0.5025 & 0.5016 \\ 5 & 0.5039 & 0.5054 & 0.5033 & 0.5046 \end{tabular}