Test No

Factor

Total phenol content/%

A

B

C

D

1

1

1

1

1

8.57

2

1

2

2

2

8.10

3

1

3

3

3

7.45

4

2

1

2

3

6.55

5

2

2

3

1

9.47

6

2

3

1

2

9.01

7

3

1

3

2

9.23

8

3

2

1

3

9.11

9

3

3

2

1

9.72

k₁

8.04

8.12

7.68

9.25

k₂

8.34

9.23

8.12

8.78

k₃

9.35

8.73

8.90

7.70

R

1.31

1.11

1.22

1.55