For each of 18 preserved cores from oil-wet carbonate reservoirs, the amount of residual gas saturation after a solvent injection was measured at water flood-out. Observations, in percentage of pore volume, were
(See “Relative Permeability Studies of Gas-Water Flow Following Solvent Injection in Carbonate Rocks,” Soc. Of Petroleum Engineers J., 1976: 23–30.)
a. Construct a boxplot of this data, and comment on any interesting features.
b. Is it plausible that the sample was selected from a normal population distribution?
c. Calculate a 98% CI for the true average amount of residual gas saturation.
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