Concept explainers
QSR has been reporting on the largest quick-serve and fast-casual brands in the United States for nearly 15 years. The file contains QSR contains the food segment (burger, chicken, pizza, or sandwich) and U.S.
a. At the 0.05 level of significance, is there evidence of a difference in the mean U.S. mean sales per unit (
b. At the 0.05 level of significance, is there a difference in the variation in U.S. average sales per unit (
c. What effect does your result in (b) have on the validity of the results in (a)?
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