2. One of the undersecretaries of the Department of Labor and Employment (DOLE) claims that the average salary of a civil engineer is Php 18,000. A sample of 19 civil engineer's salary has a mean of Php 17,350 and a standard deviation of Php 1,230. Is there enough evidence to reject the undersecretary's claim at a = 0.01? Solution: Step 1: Null and alternative hypothesis H₂: H₂: [ Step 2: Significance level a = Step 3: Test statistic: Step 4: Decision rule: Step 5: Decision:

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