1. There are two fighters, A and B. Based on their performance, the A-Fighter had 84 wins and 76 losses. At this time, can we say that A's capability is above B? Validate at 5% effective level.

2. After examining the fragmentation strength of steel produced in a factory, we found the strength of six samples.

160,165,161,164,162,160 (Unit)

The standard strength is 161(unit) but can you say that the strength of the steel in this factory is the same as that of the standard strength? (Answer at the effective level of 0.05).

x	y=x-161	y^2
160	-1	1
165	4	16
161	0	0
164	3	9
162	1	1
160	-1	1

1-3. The scores of 40 students who chose physics and 25 students who chose biology were shown in the following table. Then, determine if there is a difference in the population mean of physical and biological subjects. (Answer at 0.05% effective level.)