4) A study was conducted to compare the amount of salt in potato chips. Random samples of four brands were obtained and the amount of salt in each one-ounce portion of potato chips was recorded in milligrams of sodium. The data are given in the table below (Source: Hurley and Liebman Nutrition Action Newsletter, May, 2001 in Kokoska, 2007.) Observations BRAND Ruffles 242 211 Pringles 120 147 Lay's 241 Cape Cod 155 a) Propose the appropriate test and indicate the null and alternative hypothesis b) Conduct the test and state your conclusions c) What assumptions did you make to conduct the test that you have chosen