Question: Salaries of entry-level computer engineers have Normal distribution with unknown mean and variance. Three randomly selected computer engineers have salaries (in $1000s): 30, 50, 70

Salaries of entry-level computer engineers have Normal distribution with unknown mean and variance. Three randomly selected computer engineers have salaries (in $1000s):

30, 50, 70

Does this sample provide a significant evidence, at a 1% level of significance, that the average salary of all entry-level computer engineers is less than $80,000? Explain.

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