Refer to the Minerals Engineering (Vol. 46-47, 2013) study of the impact of calcium and gypsum on the flotation properties of silica in water, Exercise 2.48 (p. 53). Fifty solutions of deionized water were prepared both with and without calcium/ gypsum, and the level of flotation of silica in the solution was measured using a variable called zeta potential (measured in millivolts, mV). The data (simulated, based on information provided in the journal article) are reproduced in the table. Can you conclude that the addition of calcium/ gypsum to the solution affects silica flotation level?
Data for Exercise 9.30,

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Without calcium/gypsum -49,2 -51.8 -47.1 -50.8 -53.5 -51.5 -53.7 -46.4 -49.7 -53.0 -53.8 -54.4 -52.2 -54.5 -57.4 -49.9 -50.2 -54.8 -53.8 -53.3 -52.1 -50.7 -54.5 -49.7 -50.6 -52.9 -51.2 -50.2 -53.2 -52.9 -52.8 -50.2 -50.1 -53.2 -54.2 -50.8 -56.1 -51.0 -55.6 -50.3 -57.6 -47.4 -47.5 -55.7 -55.0 -52.8 -50.6 -55.6 -52.3 -45.7 With calcium/gypsum -9.2 -10.7 -11.5 -10.9 -12.4 -11.6 -10.6 -8.0 -12.6 -10.9 -10.0 -11.0 -13.1 -11.3 -9.9 -11.8 -8.9 -13.1 -10.7 -12.1 -11.2 -10.7 -9.1 -12.1 -6.8 -11.5 -10.4 -11.5 -12.1 -11.3 -13.6 -10.5 -11.5 -11.0 -7.1 -12.4 -11.4 -9.9 -8.6 -10.1 -11.3 -13.0 -11.3 -11.9 -8.6 -11.3 -13.0 -12.2 -8.8 -13.4