A

B

And

Sample size

200

198

200

Get to the bottom of the grades

8.02 ± 0.98

8.14 ± 0.96

8.15 ± 0.95

Measured results

7.96 ± 0.96

7.98 ± 0.93

8.14 ± 0.90

T

−2.084

−6.848

−0.114

P

0.038

<0.05

0.909