Question: Question 2:

An air quality specialist working for a large regional planning agency is studying the concentration of sulfur dioxide in the region to see whether or not the concentration exceeds (is worse than) the federally mandated standard. She has taken 200 air samples at a set of randomly selected locations throughout the region at random times. Her results were as follows:

Sample mean: 0.0314 parts per million

Sample standard deviation: 0.0100 parts per million

The national air quality standard for sulfur dioxide is an annual mean of 0.030 parts per million in each region. Conduct a statistical hypothesis test and conclude whether or not the national standard is being violated in this region. Be sure to clearly spell out the decision you come to.

(a) State the parameter of interest.

(b) Clearly state the null and alternative hypothesis.

(c) Evaluate these two hypotheses. In one or two sentences clearly spell out your conclusion.