Question #2454

A random sample of 90 students at a private high school is tested and a mean SAT score of 1030 is obtained. The average score for public high school student is 1000 (σ= 200).
Compute Z obt

Expert's answer

Zobt = (x - μ)/(σ /√ n) = (1030 - 1000)/(200/√90) = 1.42

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