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March 25, 2017

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Scores on the ACT college entrance exam are Normally distributed with a mean µ = 20 and standard deviation σ = 5. An SRS of 25 ACT scores is selected, construct a 95% Confidence Interval for the sample mean (X-Bar) and interpret your result.

  • statistics - ,

    95% = mean ± 1.96 SEm

    SEm = SD/√n

    I'll let you do the calculations and interpretations.

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