A clinic has an evaluation system to assess multiple outcomes. Help the manager answer her questions with the information below: b. a. This year's evaluation shows that, in a sample of 300 clients, the average cholesterol level of 192 with standard deviation of 37. The manager believes that clients' cholesterol is below the clinical threshold of healthy cholesterol level of 200. Test the manager's hypothesis assuming at t-critical of 1.97 (for an alpha of 0.05). From the evaluation done two years prior, the manager knows that clients used to have an average cholesterol level of 187 and believes this number has changed among today's clients. Help the manager test this hypothesis using the same t-critical.