92 105 56 76 93 78 53 34 83 49 90 45
(a) Estimate the mean (average) savings.
(b) Develop a 90% confidence interval for the mean in (a).
(c) Develop a 95% confidence interval for the mean in (a).
(d) Develop a 99% confidence interval for the mean in (a).
(e) Would it be okay for Wellpoint to claim they save patients about $100 on average?
(f) Would it be okay for Wellpoint to claim they save patients about $80 on average?