Storage time and the vitamin C content of bread. Does bread lose its vitamins when stored? Small loaves of bread were prepared with ?our that was forti?ed with a ?xed amount of vitamins. After baking, the vitamin C content of two loaves was measured. Another two loaves were baked
at the same time, stored for one day, and then the vitamin C content was measured. In a similar manner, two loaves were stored for three, ?ve, and seven days before measurements were taken. The units are milligrams of vitamin C per hundred grams of ?our (mg/100 g).10 Here are the data:
Explain why it is inappropriate to perform a multiple-comparisons analysis for the vitamin E data.
(a) Perform the Bonferroni or another multiple- comparisons procedure for the vitamin A data and summarize the results.