Four sets of measurements were taken on the same response variable of a process using four different sensors. The true value of the response was known to be constant. The four sets of data are shown in Figure P15.10. Rank these data sets (and hence the sensors) with respect to

a. Precision.

b. Accuracy.


Analysis:
(b) and (c) are precise, (a) and (d) are not.
(a) and (c) are accurate, (b) and (d) are not.

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