33) Over the past several months, an adult patient has beentreated for tetany (severe muscle spasms). This condition isassociated with an average total calcium level below 6 mg/dl.Recently, the patient's total calcium tests gave the followingreadings (in mg/dl). Assume that the population of xvalues has an approximately normal distribution.
| 9.3 | 9.0 | 10.5 | 9.1 | 9.4 | 9.8 | 10.0 | 9.9 | 11.2 | 12.1 |
(a) Use a calculator with mean and sample standard deviationkeys to find the sample mean reading x and the samplestandard deviation s. (Round your answers to two decimalplaces.)
(b) Find a 99.9% confidence interval for the population mean oftotal calcium in this patient's blood. (Round your answer to twodecimal places.)
| lower limit    | mg/dl |
| upper limit    | mg/dl |
