Question

Civil materials

1. In a ready-mix pant, cylindrical samples are prepared and tested periodically to detect any mix problem and to ensure that the compressive strength is higher than the lower specification imit. Their minimum target value was set at 4,300 psi. The following compressive strength data were collected. a) Calculate the mean, standard deviation, and the coefficient of variation of the data b) On the attached graph paper crate a control chart for these data showing the target value and the lower specification limit. Is the plant production meeting the specification requirement? If not, comment on possible reasons. Comment on the data scatter. Compressive strength (Psi) 5359 4964 5695 4300 5595 Sample # Compressive Strength (psi) 595 4188 5155 4278 4320 Sample # 4 6 10

Answer 1