The production manager of a fruit canning factory begins to suspect that as a result of observing the machine operators, the 16-ounce can of fruits may be slightly filled beyond the required weight. He takes q random sample of 80 packed cans and finds that the mean weight is 16.08 ounces with a standard deviation of 0.04 ounces at 1% level of significance. Can the production manager conclude that the fruit cans were being overfilled?