A company claims that the mean monthly salary for their managers is 12 thousand dollars. A sample of 100 managers has a sample mean monthly salary of 11.6 thousand dollars with a sample standard deviation of 1.2 thousand dollars. You want to perform a hypothesis test challenge the validity of the claim made by the company, at a significance level of a = 0.05. Your hypotheses are: Но: и 3 12, 000 %3D Ha:u < 12, 000

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