=+three different brands of tires with identical lifetime ratings—a store brand (1) and two national brands

(2 and 3)—are selected, and the lifetime of each tire is determined, resulting in the following data:

Sample Sample Sample standard Brand size mean deviation 1 40 38,376 1522 2 32 41,569 1711 3 32 42,123 1645 Calculate and interpret a confidence interval with confidence level 95% for  5 1 2 (2 1 3)y2.