Twelve samples, each containing five parts, were taken from a process that produces steel rods at Emmanual Kodzi's factory. The length of each rod in the samples was determined. The results were tabulated and sample means and ranges were computed. The results were: Sample Mean Range Sample Sample Sample Mean (in.) Range (in.) (in.) (in.) 1 13.900 0.044 7 13.903 0.021 23456 13.900 0.051 8 13.903 0.058 13.893 0.042 9 13.893 0.039 13.908 0.037 10 13.901 0.038 13.897 0.048 11 13.901 0.054 13.901 0.053 12 13.904 0.061