Confidence-Interval

• z-Based Confidence Intervals for a Population Mean: Known
• t-Based Confidence Intervals for a Population Mean: Unknown
• Confidence Intervals for a Population Proportion
• Sample size determination

Descriptive Statistics 描述性统计

The science of describing the important aspects of a set of measurements

• Collect data
  e.g. Survey
• Present data
  e.g. Tables and graphs
• Characterize data
  e.g. Sample mean =

Inferential Statistics

The science of using a sample of measurements to make generalizations about the important aspects of a population of measurements.

• Estimation
  e.g.: Estimate the population mean weight using the sample mean weight
• Hypothesis testing
  e.g.: Test the claim that the population mean weight is 120 pounds