Acme Foods wants to make its chips saltier, but it doesn't want to spend more than it has to on salt. A sample of consumers is asked to compare its current chips variety (saltiness = 100) with saltier versions and to say whether the new versions are saltier. On an average, sample consumers reliably say that a new chips variety is saltier when its saltiness value is 108, but not when its saltiness value is below 108. Assuming Acme Foods' sample consumers are representative of people in general, which of the following percentage values best represents the just noticeable difference for saltiness?

Question

Quizplus · Accepted Answer

The just noticeable difference (JND) is the smallest difference between two stimuli that can be perceived by an observer. In this case, the JND for saltiness is 8%, as the sample consumers reliably noticed a difference when the saltiness value increased by 8%, but not when it was lower than that. Therefore, the correct answer is A.

Acme Foods Wants to Make Its Chips Saltier, but It