Chapter 9: Inference for MeansIn this chapter, you'll learn how to:  Construct and interpret a confidence interval for estimating an unknown mean
 Perform a significance test for a single mean
 Construct and interpret a confidence interval for estimating the difference between two means
 Perform a significance test for the difference between two means
 Use a confidence intervl to estimate the mean of the differences from paired samples
 Perfom a significance test for the mean of the differences from paired samples
