Question: A random sample of 63 second graders in a certain school district are given a standardized mathematics skill test. The sample mean score is x=

A random sample of 63 second graders in a certain school district are given a standardized mathematics skill test. The sample mean score is x= 52. Assume the standard deviation of test scores is o=11. The nationwide average score on this test is 50. The school superintendent wants to know whether the second graders in her school district are different from the nation wide average. Use the a= 0.10 level of signification and the critical value method

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