company was considering lowering its health care coverage for its employees. Part of the justification was the belief that the average amount of insurance claims filed by employees did not exceed $250. The company conducted a survey among 100 of its employees and calculated the test statistic to be 2.31.

a) Is there sufficient evidence to refute the company's belief at the =.05 level of significance? State your conclusion in terms of the problem.

b) What is the p-value of the test statistic?