After reading this chapter, you should be able to:

12.1 Define normal distribution and z scores.

12.2 Explain confidence intervals and confidence levels.

12.3 Understand difference of means hypothesis testing with population data: z tests.

12.4 Understand difference of means hypothesis testing with sample data: t tests.

12.5 Explain hypothesis testing for a proportion.

12.6 Understand statistics with two samples.