An operations manager who supervises an assembly line has been experiencing problems with the sequencing of jobs ...

An operations manager who supervises an assembly line has been experiencing problems with the sequencing of jobs. The problem is that bottlenecks are occurring because of the inconsistency of sequential operations. He decides to conduct an experiment wherein two different methods are used to complete the same task. he measures the times (in seconds). The data are listed here. Can he infer that the second method is more consistent than the first method? Data are in file Xr13-61. 

Method 1: 8.8 9.6 8.4   9.0 8.3 9.2 9.0 8.7 8.5 9.4

Method 2: 9.2 9.4 8.9   9.6 9.7 8.4 8.8 8.9 9.0 9.7