The following table contains the measurements of the key length dimension from

The following table contains the measurements of the key length dimension from a fuel injector. These samples of size five were taken at one-hour
intervals.

Sample Number

1

2

3

4

5

1

.486

.499

.493

.511

.481

2

.499

.506

.516

.494

.529

3

.496

.500

.515

.488

.521

4

.495

.506

.483

.487

.489

5

.472

.502

.526

.469

.481

6

.473

.495

.507

.493

.506

7

.495

.512

.490

.471

.504

8

.525

.501

.498

.474

.485

9

.497

.501

.517

.506

.516

10

.495

.505

.516

.511

.497

11

.495

.482

.468

.492

.492

12

.483

.459

.526

.506

.522

13

.521

.512

.493

.525

.510

14

.487

.521

.507

.501

.500

15

.493

.516

.499

.511

.513

16

.473

.506

.479

.480

.523

17

.477

.485

.513

.484

.496

18

.515

.493

.493

.485

.475

19

.511

.536

.486

.497

.491

20

.509

.490

.470

.504

.512

Construct a three-sigma X -chart and R -chart (use Exhibit 10.13) for the length of the fuel injector. What can you say about this process?