2 Samples of 20 parts are selected from two machines, and a critical dimension is measured on each part. The data are shown in Table 1 and 2. Compare the normality of both machines. Table 1 Machine 1 99.4 101.5 102.3 96.7 99.1 103.8 100.4 100.9 99.0 99.6 102.5 96.5 98.9 99.4 99.7 103.1 99.6 104.6 101.6 96.8 Table 2 Machine 2 90.9 100.7 95.0 98.8 99.6 105.5 92.3 115.5 105.9 104.0 109.5 87.1 91.2 96.5 96.2 109.8 92.8 106.7 97.6 106.5