(Answered) 1 every year a standardized test is given to many 8th

Statistics

1. Every year a standardized test is given to many 8th graders in the US. Out of 28 students who took this test this year, the average test score was 570 with a standard deviation of 100. If the national average was 600, is there enough evidence to conclude that the average score has decreased? Use a p-value and 5% significance.

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