As a volunteer for a consumer research group, LaShonda was assigned to analyze the freshness of three brands of tortilla chips. She examined four randomly chosen bags of chips for four brands of chips from three different stores. She recorded the number of days from the current date until the "fresh until" expiration date printed on the package. Research question: Do mean days until the expiration date differ by brand or store? Note: Some data values are Freshness negative.

Days Until Expiration Date on Package Store 1 Store 2 25 24 10 27 15 8 6 Store 3 Brand A 17 18 20 Brand B 29 30 24 23 24 Brand C 16 30 21 42 32 38 28 17 27 18 Brand D 21 30 39 45 10