Michelson actually made 100 measurements on the velocity of light in five trials of 20 observations each. The second set of 20 measurements is shown in Table 6E.28

(a) Plot these new measurements on the control charts constructed in Exercise 6.69. Are these new measurements in statistical control? Give a practical interpretation of the control charts.
(b) Is there evidence that the variability in the measurements has decreased between trial 1 and trial 2?

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TABLE 6E.28 Additional Velocity of Light Data for Exercise 6.70 Measurement Velocity Measurement Velocity 21 20 960 830 940 790 960 810 940 880 880 880 31 32 24 25 26 27 28 29 34 35 36 37 38 39 40 800 830 850 800 880 790 900 760 800