Answered: A patient with blood pressure over 130…

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

(b) A patient with blood pressure over 130 is considered to have high blood pressure. Perform a t-distribution hypothesis test (Chapter 17) to investigate whether the mean blood pressure for heart disease patients is greater than 130.

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Group by: HD

HD	n	Mean	Variance	Std. dev.	Std. err.	Median	Range	Min	Max	Q1	Q3
No	164	242.64024	2857.606	53.45658	4.1742576	234.5	438	126	564	208.5	267.5
Yes	139	251.47482	2448.9468	49.486835	4.1974185	249	278	131	409	217	284

Definition Definition Middle value of a data set. The median divides a data set into two halves, and it also called the 50th percentile. The median is much less affected by outliers and skewed data than the mean. If the number of elements in a dataset is odd, then the middlemost element of the data arranged in ascending or descending order is the median. If the number of elements in the dataset is even, the average of the two central elements of the arranged data is the median of the set. For example, if a dataset has five items—12, 13, 21, 27, 31—the median is the third item in ascending order, or 21. If a dataset has six items—12, 13, 21, 27, 31, 33—the median is the average of the third (21) and fourth (27) items. It is calculated as follows: (21 + 27) / 2 = 24.

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