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87 ACT composite scores are normally distributed with a u = 21. A sample of 25 students is andomly selected from a local high school

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87 ACT composite scores are normally distributed with a u = 21. A sample of 25 students is "andomly selected from a local high school with an x = 23 and s = 5.2. Do the data support to him that the average ACI composite score of students from this high school is different than 21 on the ACT composite score, using a = .05

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