Vitamin C content Several years ago, the U.S.

Agency for International Development provided 238,300 metric tons of corn-soy blend (CSB) for emergency relief in countries throughout the world.

CSB is a highly nutritious, low-cost fortified food.

As part of a study to evaluate appropriate vitamin C levels in this food, measurements were taken on samples of CSB produced in a factory.28 The following data are the amounts of vitamin C, measured in milligrams per 100 grams (mg/100 g) of blend, for a random sample of size 8 from one production run:

26 31 23 22 11 22 14 31 Construct and interpret a 95% confidence interval for the mean amount of vitamin C m in the CSB from this production run.