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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.

9.7       9.6       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 keys to find the sample mean reading x bar and the sample standard deviation s. (in mg/dl; round your answers to two decimal places.)

x bar =

s =

(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        

upper limit        

Top Answer

x = 10.11 s =1.02... View the full answer

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