Data:
23.5
24.2
24.2
23.4
20.8
24.7
21.8
26.8
22.7
22.2
24.2
21.3
A factory manufactures steel rods. The rods are supposed to have a mean length of 25 cm. If there is evidence at a = 0.05 that the mean length for all rods is different from 25 cm the factory will be
