Question 4: A personnel specialist of a major corporation is recruiting large number of employees for an overseas assignment. During the testing process,

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Question 4: A personnel specialist of a major corporation is recruiting large number of employees for an overseas assignment. During the testing process, management asks how things are going and she replies, "Fine, I think the average score on the aptitude test will be around 90" When the management reviews 20 of the test results compiled, it finds the mean score is 84, and the standard deviation of this score is 11. Test the hypothesis at 0.10 level of significance [t(Critical) at a = 0.10 and 19 degrees of freedom 1.729]