3.4 Toward Statistical Inference

Statistical Inference is often concerned with drawing conclusions about some numerical value associated with the population.

Goal of sampling and experimentation is to draw conclusions about an underlying population of interest based on the data collected. This process of drawing conclusions is called statistical inference.

• Sampling
• Recall:
• Motto Of Section 3.4 (and the course?!!)
• An Example
• An Example
• Parameters And Statistics
• Parameters And Statistics – Can You Tell The Difference?
• Comments on Parameters
• The Population Proportion
• The Population Proportion
• Sample Proportion
• Comment:
• Defn:  Sampling Variability
• Slide 15
• Reducing Variability
• What happens when we take many samples?
• Ex:  Simulation
• Defn: Sampling Distribution
• Slide 20
• Comments on Sampling Distributions
• Bias
• Unbiased to Estimate a Parameter
• Variability, Revisited
• Slide 25
• Bias vs. Variability
• Random Selection vs. Sample Size