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)?

Answer rating: 100% (QA)

To test the hypothesis is that the mean score for the sixth graders on t... View the full answer