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10 questions from this quiz
When the population is normal
When sample size nnn is large
Xˉ∼N(μ,σ2n)\bar{X} \sim N(\mu, \frac{\sigma^2}{n})Xˉ∼N(μ,nσ2)
n≥25n \geq 25n≥25
By sample variance s2s^2s2
∑y⋅P(Y=y)\sum y \cdot P(Y=y)∑y⋅P(Y=y)
E(Y2)−[E(Y)]2E(Y^2) - [E(Y)]^2E(Y2)−[E(Y)]2
150\frac{1}{50}501 or 0.020.020.02
s2=nn−1(x2ˉ−xˉ2)s^2 = \frac{n}{n-1}(\bar{x^2}-\bar{x}^2)s2=n−1n(x2ˉ−xˉ2)
Accept H0H_0H0
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