Question

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.

9.9

9.6

10.3

9.1

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 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

Answer 1

Let denotes the population mean of total calcium in this patient's blood.