Yes. The free plan includes 5 practice tests per course. Full access is $19.99/mo per course.

What exams does Cognify cover?

Cognify covers AP Psychology, Digital SAT, AP Biology, and AP Statistics with practice tests, rubric-graded FRQs, and score prediction.

How does Cognify compare to Khan Academy?

Cognify focuses on exam-format practice with AI grading and score prediction. Khan Academy provides broad video instruction. Cognify is purpose-built for AP and SAT exam day performance.

How does Cognify compare to UWorld and Princeton Review?

UWorld and Princeton Review rely on static question banks that students exhaust after a few sessions. Cognify generates fresh questions on demand against the official College Board exam blueprint, so every practice test is unique. FRQs are graded point-by-point against AP rubrics with specific feedback on what you earned and missed.

How accurate is the AP score prediction?

Cognify maps your percentage correct to the public AP composite scoring buckets (1-5) using historical score distributions. The prediction improves as you take more practice tests. For the Digital SAT, scores map to the 400-1600 scale using official section score conversion tables.

Does Cognify cover AP FRQ practice?

Yes. Cognify provides rubric-graded FRQ practice for AP Psychology, AP Biology, and AP Statistics. Each response is scored criterion by criterion against the official AP rubric with specific written feedback explaining what you earned, what you missed, and how to improve.

Correlation vs Causation

AP Psychology — Scientific Foundations

Overview

Understanding correlation coefficients (-1 to +1), interpreting scatterplots, and why correlation does not imply causation. Third-variable problem.

Key Terms

correlation coefficient
positive correlation
negative correlation
third variable
illusory correlation

Exam Tips

Practice interpreting correlation coefficients from data
Always consider third variables in correlation studies

Common Mistakes to Avoid

Interpreting strong correlation as proof of causation
Confusing the direction of correlation

Frequently Asked Questions

Can a correlation coefficient be above 1?

No. Correlation coefficients range from -1.0 (perfect negative) to +1.0 (perfect positive). Zero indicates no linear relationship.

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Correlation vs Causation

AP Psychology — Scientific Foundations

Overview

Understanding correlation coefficients (-1 to +1), interpreting scatterplots, and why correlation does not imply causation. Third-variable problem.

Key Terms

correlation coefficient
positive correlation
negative correlation
third variable
illusory correlation

Exam Tips

Practice interpreting correlation coefficients from data
Always consider third variables in correlation studies

Common Mistakes to Avoid

Interpreting strong correlation as proof of causation
Confusing the direction of correlation

Frequently Asked Questions

Can a correlation coefficient be above 1?

No. Correlation coefficients range from -1.0 (perfect negative) to +1.0 (perfect positive). Zero indicates no linear relationship.

Ready to practice Correlation vs Causation?

AI-generated questions with instant feedback. Free to start.

Start Practicing Free

Correlation vs Causation

Overview

Key Terms

Exam Tips

Common Mistakes to Avoid

Frequently Asked Questions

Ready to practice Correlation vs Causation?

Related Scientific Foundations Topics

Correlation vs Causation

Overview

Key Terms

Exam Tips

Common Mistakes to Avoid

Frequently Asked Questions

Ready to practice Correlation vs Causation?

Related Scientific Foundations Topics