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.

9.1

9.4

10.3

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 deviations. (in mg/dl; round your answers to two decimal places.) X = (A) ___mg/dl s= (B) ___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(C)____ mg/dl upper limit (D)____ mg/dl (c) Based on your results in part (b), do you think this patient still has a calcium deficiency? Explain.

(A)Yes. This confidence interval suggests that the patient may still have a calcium deficiency.

(B)Yes. This confidence interval suggests that the patient no longer has a calcium deficiency.

(C)No. This confidence interval suggests that the patient may still have a calcium deficiency.

(D)No. This confidence interval suggests that the patient no longer has a calcium deficiency.