Hypothesis Testing for the Population Mean: o Known 3. The Medical Rehabilitation Education Foundation claims that the average cost of rehabilitation for stroke victims is $24,672. To see if the average cost of rehabilitation is different at a particular hospital, a researcher selects a random sample of 35 stroke victims at a hospital. and finds that the average cost of rehabilitation is $25,226. The population standard deviation is $3,251. At 5% level of significance, can the claim be rejected? Use the Critical-Value Approach