WEBVTT

1
00:00:00.000 --> 00:00:04.203
The learning dashboard contains ten
fictional temperature-indication

2
00:00:04.353 --> 00:00:09.793
errors in degrees Celsius: 0.1, 0.2, 0.1,

3
00:00:09.943 --> 00:00:14.679
0.3, 0.2, 0.4, 0.3,

4
00:00:14.829 --> 00:00:18.519
0.5, 0.4 and 0.6.

5
00:00:18.669 --> 00:00:20.829
They illustrate a time-ordered pattern.

6
00:00:20.979 --> 00:00:25.203
They are not calibration data from a real
instrument and do not define

7
00:00:25.353 --> 00:00:27.060
a pharmaceutical tolerance.

8
00:00:27.810 --> 00:00:30.860
The total is 3.1 °C across ten errors,

9
00:00:31.010 --> 00:00:34.103
giving a mean error of 0.31 °C.

10
00:00:34.253 --> 00:00:37.858
The range is 0.6 minus 0.1,

11
00:00:38.008 --> 00:00:39.950
or 0.5 °C.

12
00:00:40.100 --> 00:00:42.937
The highest error is 0.6 °C.

13
00:00:43.087 --> 00:00:47.631
The chart includes the underlying values
in a table so that learners can

14
00:00:47.781 --> 00:00:51.237
check the arithmetic without relying on
colour or vision.

15
00:00:51.387 --> 00:00:54.566
These summaries describe this small
dataset only.

16
00:00:55.316 --> 00:01:00.137
For arithmetic practice only, set an
illustrative absolute-error limit of

17
00:01:00.287 --> 00:01:02.079
0.5 °C.

18
00:01:02.229 --> 00:01:06.944
Nine of the ten observations meet that
example limit and one does not.

19
00:01:07.094 --> 00:01:11.808
The limit is not an official criterion and
does not qualify an instrument.

20
00:01:11.958 --> 00:01:17.738
The upward pattern also deserves attention
even before a limit is exceeded.

21
00:01:17.888 --> 00:01:22.411
In a real investigation, examine
measurement uncertainty, reference

22
00:01:22.561 --> 00:01:27.190
suitability, conditions and data integrity
before drawing conclusions.

23
00:01:27.940 --> 00:01:33.993
Do not calculate a confident capability
claim from these ten convenient values.

24
00:01:34.143 --> 00:01:39.221
A meaningful analysis requires a suitable
study design and understanding

25
00:01:39.371 --> 00:01:42.144
of the measurement system and process
behaviour.

26
00:01:42.294 --> 00:01:45.089
In the activity, change the illustrative
limit,

27
00:01:45.239 --> 00:01:48.865
observe the count and explain what
information is still missing.

28
00:01:49.015 --> 00:01:51.682
More green points do not create more
knowledge.

29
00:01:51.832 --> 00:01:56.141
The purpose is to practice transparent
calculation and proportionate

30
00:01:56.291 --> 00:01:59.043
interpretation, not to approve a system.