Attribute difference tests measure a single attribute, e.g., sweetness, comparing one
sample with one or several others. The lack of a difference between samples with
regard to one attribute does not imply that no overall difference exists. Attribute difference
tests involving two samples (Section 7.2) are simple regarding test design and statistical
treatment; the main difﬁculty is that of determining whether test situations are one-sided
or two-sided (see next page and Example 7.1 and Example 7.2).