Conduct a hypothesis test on the following data:

A national study shows that teachers earn $50,000. A career director claims that teacher salaries in her town are lower than the national average. Considering the following data, test this hypothesis at alpha=0.05.

Data: $53,000, $48,000, $51,000, $49,000. $55,000

(1) Which type of test is this- mean or proportion?

(2) Is this a 2 tailed, right, or left tailed test?