A physician with a practice is currently sewing 290 patients. The physician would like to administer a survey to his patients to measure their satisfaction level with his practice. A random sample of 23 patients had an average satisfaction score of 8.1 on a scale of 1-10. The sample standard deviation was 1.3. Complete parts a and b below. a. Construct a 99% condence interval to estimate the average satisfaction score for the physician's practice. The 99% condence interval to estimate the average satisfaction score is ( I, I). (Round to two decimal places as needed.) b. What assumption needs to be made for this analysis? O A. The population is normally distributed. 0 B. The population standard deviation is known. 0 c. The sample size is less than 5% of the population. 0 D. There are no assumptions needed for this analysis