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.