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F-Test - Method used to test whether two samples come from populations with equal standard deviations, or to decide whether a new process, treatment, or test reduces the variability of the current process.

Factorial Experiment - Method for selecting the treatments to be included in an experiment. A complete factorial experiment is one in which observations are made for every combination of the factor levels.

Fill-in-the-blank Questions - A type of open-ended question that requests a single word or limited response set.

Focus Group - Personal interview conducted among a small number of individuals simultaneously; the interview relies more on group discussion than on directed questions to generate data.

Frame Error - Error that occurs when a sample drawn from a population differs from the target population.

Frequency - The number of times that a value appears in a distribution.

Frequency Distribution - Presents the variable values and their frequency of occurrence.
Friedman F-Test - Nonparametric test comparable to two-way ANOVA that is used to compare k populations when a randomized block design is conducted.

Graphic Rating Scale - Scale in which individuals indicate their ratings of an attribute by placing a check at the appropriate point on a line that runs from one extreme of the attribute to the other.