An automatic transmission repair shop had an established standard to do certain type of repair. They hired a new mechanic. After six months, they sampled 12 of the new mechanic's repair times versus the standard repair. The new mechanic took more than the standard time on eight of the 12 samples. How confident would the repair shop be in judging that the higher times were due to performance rather than to random causes? (Assumption: Time to repair is distributed with the mean of standard repair time and the area on the left of the mean equals the area in the right.)