Answered: 20. A medical researcher treats 16…

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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Question

20. A medical researcher treats 16 subjects with high blood pressure by increasing their physical activity and changing their diet. The average decrease in blood pressure reading is 20 after 3 months of this treatment plan. Assume that the decrease in blood pressure after 3 months of participating in the treatment plans follows a normal distribution, with unknown mean \muμ and population standard deviation of 10. A 99% confidence interval for \muμ is

a. 20±10

b. 20 ±6.45

c. 20±7.30

d. 20±7.37

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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