A sample of blood pressure measurements is taken from a data set and those values (mm Hg) are listed below. The values are matched so that subjects each have systolic and diastolic measurements. Find the mean and median for each of the two samples and then compare the two sets of results. Are the measures of center the best statistics to use with these data? What else might be better? Systolic: 97 96 134 112 154 116 156 99 153 117 Diastolic: 63 55 87 73 76 88 85 79 69 62 Find the means. The mean for systolic is nothing mm Hg and the mean for diastolic is nothing mm Hg. (Type integers or decimals rounded to one decimal place as needed.) Find the medians. The median for systolic is nothing mm Hg and the median for diastolic is nothing mm Hg. (Type integers or decimals rounded to one decimal place as needed.) Compare the results. Choose the correct answer below. A. The median is lower for the diastolic pressure, but the mean is lower for the systolic pressure. B. The mean and median appear to be roughly the same for both types of blood pressure. C. The mean and the median for the systolic pressure are both lower than the mean and the median for the diastolic pressure. D. The mean is lower for the diastolic pressure, but the median is lower for the systolic pressure. E. The mean and the median for the diastolic pressure are both lower than the mean and the median for the systolic pressure.

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Description: A sample of blood pressure measurements is taken from a data set and those values (mm Hg) are listed below. The values are matched so that subjects each have systolic and diastolic measurements. Find the mean and median for each of the two samples a

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

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A sample of blood pressure measurements is taken from a data set and those values (mm Hg) are listed below. The values are matched so that subjects each have systolic and diastolic measurements. Find the mean and median for each of the two samples and then compare the two sets of results. Are the measures of center the best statistics to use with these data? What else might be better?

Systolic:	97	96	134	112	154	116	156	99	153	117
Diastolic:	63	55	87	73	76	88	85	79	69	62

Find the means.

The mean for systolic is

nothing

mm Hg and the mean for diastolic is

nothing

mm Hg.

(Type integers or decimals rounded to one decimal place as needed.)

Find the medians.

The median for systolic is

nothing

mm Hg and the median for diastolic is

nothing

mm Hg.

(Type integers or decimals rounded to one decimal place as needed.)

Compare the results. Choose the correct answer below.

The median is lower for the diastolic pressure, but the mean is lower for the systolic pressure.

The mean and median appear to be roughly the same for both types of blood pressure.

The mean and the median for the systolic pressure are both lower than the mean and the median for the diastolic pressure.

The mean is lower for the diastolic pressure, but the median is lower for the systolic pressure.

The mean and the median for the diastolic pressure are both lower than the mean and the median for the systolic pressure.

Are the measures of center the best statistics to use with these data?

Since the systolic and diastolic blood pressures measure different characteristics, only measures of center should be used to compare the data sets.

Since the systolic and diastolic blood pressures measure different characteristics, a comparison of the measures of center doesn't make sense.

Since the sample sizes are large, measures of center would not be a valid way to compare the data sets.

Since the sample sizes are equal, measures of center are a valid way to compare the data sets.

What else might be better?

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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