Over the past several months, an adult patient has been treatedfor tetany (severe muscle spasms). This condition is associatedwith an average total calcium level below 6 mg/dl. Recently, thepatient's total calcium tests gave the following readings (inmg/dl). Assume that the population of x values has an approximatelynormal distribution. 9.3 9.0 10.9 8.5 9.4 9.8 10.0 9.9 11.2 12.1(a) Use a calculator with mean and sample standard deviation keysto find the sample mean reading x and the sample standard deviations. (Round your answers to two decimal places.) x = Correct: Youranswer is correct. mg/dl s = mg/dl (b) Find a 99.9% confidenceinterval for the population mean of total calcium in this patient'sblood. (Round your answer to two decimal places.) lower limit mg/dlupper limit mg/dl
