An experiment was carried out to compare electrical resistivity for six different low-permeability concrete bridge deck mixtures. There were 26 measurements on concrete cylinders for each mixture; these were obtained 28 days after casting. The entries in the accompanying ANOVA table are based on information in the article “In-Place Resistivity of Bridge Deck Concrete Mixtures” (ACI Materials J., 2009: 114–122). A partial ANOVA table for this data follows:
a. Fill in the missing entries in the ANOVA table.
b. State the null and alternative hypotheses of interest in this experiment.
c. Use .05 to carry out the hypothesis test in part (b).