Field Size (cm × cm)

Timer error, τ (s)

5 × 5

1.20

10 × 10

1.19

15 × 15

1.21

20 × 20

1.22

25 × 25

1.22

30 × 30

1.21

35 × 35

1.22

Mean

1.21

Standard Deviation

0.01

Standard Deviation from mean

0.44