Key Takeaways
Lesson Description
Key Takeaways
• Confidence intervals estimate population means.
• t-distributions are used when the population standard deviation is unknown.
• Larger sample sizes produce more precise estimates.
• Hypothesis tests evaluate claims about population means.
• Statistical conclusions should always be stated in context.
Must Know Equations
Sample Mean:
x̄ = Σx/n
Standard Error:
s/√n
Confidence Interval:
x̄ ± t* × SE
Test Statistic:
t = (x̄−μ₀)/(s/√n)
Must Know Vocabulary
Sample Mean
Population Mean
t-Distribution
Degrees of Freedom
Confidence Interval
Hypothesis Test
Standard Error
AP Exam Focus
• Construct confidence intervals for means.
• Perform one-sample and paired t-tests.
• Interpret statistical results in context.