A pharmaceutical company fills vials with
a saline solution. The target value for
the salinity is 50.
The salinity level can be adjusted using
a dial on the machine. the value shown
on the dial is the nominal value, it may
need to be adjusted to compensate for
errors:
We need to check the accuracy of the
machine, the usual way of doing this is
to take a sample from the process and
calculate the sample mean. If the sample
mean is significantly different from the
target value then we will adjust the machine
accordingly. I took a sample of 20 vials
and obtained the values:
|
50.64 |
47.55 |
50.62 |
60.00 |
50.67 |
| 49.11
|
52.22
|
57.40
|
62.58
|
51.14
|
| 45.41
|
56.86
|
53.77
|
48.53
|
49.59
|
| 43.91
|
51.17
|
54.28
|
46.99
|
58.41
|
If you prefer to take your own sample
you can press the 'Take Sample' button.
You can also turn the dial to adjust the
setting, but that is not part of this
exercise.
|
