Lecture 1
Statistics and Business Decisions
6 independent questions
QBA201 · FALL 2026
Interactive practice
Choose a topic, try the questions, and reveal the worked solutions after your attempt. Explore new values and changing graphs where available.
14 practice pages · Lectures 1–25
Lecture 2
Data Types and Categorical Comparisons
6 independent questions
Lectures 3–4
Graphs That Answer Statistical Questions
6 independent questions
Lectures 5–6
Numerical Summaries and Relationships
8 independent questions
Lecture 7
Data Collection and Sampling
6 independent questions
Lectures 8–10
Probability in Words and Calculations
8 independent questions
Lectures 11–13
Discrete Distributions and Random-Variable Calculations
8 independent questions
Lecture 14
Continuous Models and Normal Probabilities
8 independent questions
Lectures 15–17
Sampling Distributions and Standard Errors
8 independent questions
Lectures 18–19
Estimation and confidence intervals
11 questions
Lectures 20–21
z Tests and Decision Errors
14 independent questions
Lectures 22–23
t Tests for Population Means
10 independent questions
Variance test
The Chi-Square Test for a Population Variance
4 independent questions
Lectures 24–25
Regression and business interpretation
12 independent questions