A hospital spokesperson claims that the standard deviation of the waiting times experienced by patients in its minor emergency department is no more than 0.8 minutes. A random sample of 20 waiting times has a standard deviation of 1.2 minutes. At a = 0.05, is there enough evidence to reject the spokesperson's claim? Assume the population is normally distributed. Complete parts (a) through (e) below. Click the icon to view the Chi-Square Distribution Table. (a) Write the claim mathematically and identify Ho and Ha OA. Ho: 0.8 (b) Find the critical value(s). X - (Round to three decimal places as needed. Use a comma to separate answers as needed.)