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.

Chapter 12: More about Tests and Intervals Summarize issues in statistical inference by posing three questions when looking at data. Am I surprised (Should I reject the null hypothesis) How surprised am I (What’s the P-value) What would not surprise me (Write a confidence interval for the parameter) Interpretation of the P-value See the end of Chapter 10 notes. In addition for most of the Chapter 10 and Chapter 11 hypothesis test examples I gave an interpretation of the p-value. Critical Values in Hypothesis Testing We test hypotheses about parameters. So far the parameters we have used in hypotheses are the mean of the population (μ) and the population proportion (p). The burden of proof falls on us to find evidence against the null hypot