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. 9.30 9.60 10.30 8.90 9.40 9.80 10.00 9.90 11.20 12.10 (a) Use a calculator with mean and sample standard deviation keys to find the sample mean reading x and the sample standard deviation s. (Round your answers to four decimal places.) x= _____ mg/dl s= _ mg/dl (b) Find a 99.9% confidence interval for the population mean of total calcium in this patient's blood. (Round your answer to two decimal places.) lower limit _ mg/dl upper limit ______ mg/dl (c) Based on your results in part (b), do you think this patient still has a calcium deficiency? Explain. (1) Yes. This confidence interval suggests that the patient may still have a calcium deficiency. (2) Yes. This confidence interval suggests that the patient no longer has a calcium deficiency. (3) No. This confidence interval suggests that the patient may still have a calcium deficiency. (4) No. This confidence interval suggests that the patient no longer has a calcium deficiency.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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.

9.30

9.60

10.30

8.90

9.40

9.80

10.00

9.90

11.20

12.10

(a) Use a calculator with mean and sample standard deviation keys to find the sample mean reading x and the sample standard deviation s. (Round your answers to four decimal places.)

x= _________ mg/dl

s= _________ mg/dl

(b) Find a 99.9% confidence interval for the population mean of total calcium in this patient's blood. (Round your answer to two decimal places.)

lower limit _________ mg/dl

upper limit __________ mg/dl

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

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

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

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

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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