1. Review Chapter 1-3

2. Exam 1 25 questions 50 points 90 minutes 1 attempt Results will be known once the exam closes for everybody

3. Questions Hypothesis Testing Calculation of Type I and II from problem setting Statistical signficance Definition and interpretation of Type I and II Type of hypothesis – Right-tailed, left-tailed, two sided

4. Sampling Different sampling schemes Which is applicable in what situation Difference between cluster, stratified, and simple random sampling When to sample

5. Statistical Inference and Estimation What is it? Where is it used? Difference between statistic and parameter

6. Types of Data Quantitative vs. Qualitative Nominal, ordinal vs ratio, interval Cross sectional vs time series

7. Measures Mean, median, mode, percentile calculations From raw data From frequency distribution Difference between symmetric and skewed distribution Interpretation of the measures

8. Variability Range, IQR, Standard Deviation, Variance Interpretation Calculations Units Box Plots Interpretation Calculation