A physician with a practice is currently serving 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 22 patients had an average satisfaction score of 7.7on a scale of? 1-10. The sample standard deviation was 1.8. Complete parts a and b below.
a. Construct a? 99% confidence interval to estimate the average satisfaction score for the? physician's practice.
The? 99% confidence interval to estimate the average satisfaction score is ( ____ , _____ )
What assumption needs to be made for this? analysis?
A.The population standard deviation is known.
B.The population is normally distributed.
C.The sample size is less than? 5% of the population.
D.There are no assumptions needed for this analysis.