The u. s. food and drug administration (fda) performed a study that compared the carbohydrate content (as a percentage of weight) of several major brands of corn and potato chips. fourteen brands of corn chips were sampled and 14 brands of potato chips were sampled. data was collected and the following 95% confidence interval was computed for the difference in means. intrepret the 95% confidence interval for the difference in the mean carbohydrate content between the corn chip and potato chip groups.