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✦ Statistics · Grade Level: ★★☆☆☆

Master the Core
Concepts

20 carefully selected questions on Hypothesis Testing, Normal Distributions & Z-Scores, and Margin of Error. Instant feedback on every answer.

z = (x − μ) / σ
ME = z* · (σ/√n)
CI = x̄ ± ME
H₀ null hypothesis
H₁ alternative
p-value < α → reject H₀
68–95–99.7 rule
σ/√n standard error

⚡ Super Memory Points — Say These Out Loud!

"REJECT when SMALL" p-value < α → reject H₀. Tiny p = strong evidence.
"BIGGER n = NARROWER" Larger sample → smaller margin of error → tighter CI.
"Z TELLS DISTANCE" z = how many σ away from mean. z=0 → at the mean.
"68 · 95 · 99.7" 1σ=68%, 2σ=95%, 3σ=99.7% of data in normal curve.
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