Bailey, Cox, and Springer (1978) used high-pressure liquid chromatography to measure the...

Bailey, Cox, and Springer (1978) used high-pressure liquid chromatography to measure the amounts of various intermediates and by-products in food dyes. The following table gives the percentages added and found for two substances in the dye FD&C Yellow No. 5. Is there any evidence that the amounts found differ systematically from the amounts added?