A random sample of 85 sixth graders has a mean (x-bar) score of 265 with a standard
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Question:
A random sample of 85 sixth graders has a mean (x-bar) score of 265 with a standard deviation, σ = 55, on a history assessment test. The test result prompts a school administrator to state that the mean score for the sixth graders on the test is more than 260. α = 5%.
What is the value of the test statistic (z-value)?
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