Over the past several months, an adult patient has been treated for tetany (severe muscle spasms). This condition is associated with an average total calcium level below 6 mg/dl. Recently, the patient’s total calcium tests gave the following readings (in mg/dl). Assume that the population of*x*values has an approximately normal distribution.

9.3 | 9.6 | 10.5 | 8.5 | 9.4 | 9.8 | 10.0 | 9.9 | 11.2 | 12.1 |

(a)

Use a calculator with mean and sample standard deviation keys to find the sample mean readingand the sample standard deviation*s*. (in mg/dl; round your answers to two decimal places.)

=mg/dl*s*=mg/dl

(b)

Find a 99.9% confidence interval for the population mean of total calcium in this patient’s blood. (in mg/dl; round your answer to two decimal places.)

lower limit mg/dl

upper limit mg/

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