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 ofxvalues 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 reading
and the sample standard deviations. (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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