请教这种情况下应该用哪中控制图？

塑料行业，24小时生产，抽样方法每四小时抽取样一瓶样品，一瓶样品测试两个数据。可以使用均值、极差图吗？我担心因为组内变异过大于组间变异


X1 X2
1 2.442109687 2.440849543
2 2.445132365 2.445132365
3 2.447031183 2.43808083
4 2.43975026 2.440312307
5 2.440152887 2.452736318
6 2.447385692 2.450931157
7 2.45058318 2.45337219
8 2.452351228 2.445656566
9 2.443639463 2.442091891
10 2.445484811 2.439393939
11 2.443278689 2.448402948
12 2.445041322 2.442039854
13 2.440876546 2.444911018
14 2.450666667 2.444213156
15 2.440729483 2.437962376
16 2.444115157 2.443398245
17 2.448346683 2.454659423
18 2.440275806 2.440769072
19 2.442447496 2.449413808
20 2.438531712 2.438143247
21 2.446502914 2.442937123
22 2.455179283 2.446847211
23 2.445661157 2.43989715
24 2.445016077 2.438706878
25 2.449625312 2.446813092
26 2.447993448 2.445592577
27 2.445284604 2.444961897
28 2.449644797 2.444422624
29 2.447102495 2.440874317
30 2.448111159 2.441767068