Question

A sample of blood pressure measurements is taken for a group of​ adults, and those values​ (mm Hg) are listed below. The values are matched so that

1010

subjects each have a systolic and diastolic measurement. Find the coefficient of variation for each of the two​ samples; then compare the variation.

Systolic	118118	128128	158158	9494	158158	122122	118118	138138	126126	122122	Open in StatCrunch + Copy to Clipboard + Open in Excel +
Diastolic	8181	7676	7676	5454	8989	8989	5858	6565	7272	8282

The coefficient of variation for the systolic measurements is

14.6 14.6​%.

​(Type an integer or decimal rounded to one decimal place as​ needed.)

The coefficient of variation for the diastolic measurements is

15.8 15.8​%.

​(Type an integer or decimal rounded to one decimal place as​ needed.)

Compare the variation.

The coefficients of variation for each data set are

within 5 percentage points of each other.

within 5 percentage points of each other.

more than 5 percentage points apart.

​Therefore, the systolic measurements vary

about the same as

significantly more than

about the same as

significantly less than

the diastolic measurements.

Answer 1

Please check the data as data is not correctly uploaded there is some error. So I counted the two numbers as one.

Please do the comment if there are any changes in data I will edit my answer. Thank You!

The given data is

systolic	diastolic
118	81
128	76
158	76
94	54
158	89
122	89
118	58
138	65
126	72
122	82

Using excel<data<megastat<descriptive statistics

Here is the output:

Descriptive statistics
	systolic	diastolic
count	10	10
mean	128.20	74.20
sample standard deviation	19.24	12.07
sample variance	370.18	145.73
minimum	94	54
maximum	158	89
range	64	35
skewness	0.22	-0.47
kurtosis	0.41	-0.80
coefficient of variation (CV)	15.01%	16.27%

The coefficient of variation for the systolic measurements is 15.0%

The coefficient of variation for the diastolic measurements is 16.3%

The coefficients of variation for each data set are within 5 percentage points of each other.

Therefore, the systolic measurements vary about the same as the diastolic measurements.

Please check the data first.

Please do the comment for any doubt or clarification.