Consider an industrial experiment in which we have a sample of n = 10 fabrics
subjected to washing. The goal of the experiment is to analyze the performance of
a new experimental detergent for clothes. Specifically, the response variable under
study is the so called reflectance, that is the proportion of incident light which a given
surface (of fabric) is able to reflect, which can be considered a measure related to the
cleaning efficacy of the detergent. Suppose we wish to test, at the significance level