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 thesedata? What else might bebetter?

Systolic: 144 157 96 113 141 151 122 126 109 99

Diastolic: 60 64 90 51 65 83 63 91 69 75

Find the means.

The mean for systolic is

mm Hg and the mean for diastolic is

mm Hg

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

Find the medians.

The median for systolic is

mm Hg and the median for diastolic is

mm Hg.

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

Compare the results. Choose the correct answer below.

A.

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

B.

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

C.

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

D.

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

E.

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

Are the measures of center the best statistics to use with thesedata?

A.

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

B.

Since the systolic and diastolic blood pressures measure differentcharacteristics, a comparison of the measures of centerdoesn't make sense.

C.

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

D.

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

What else might bebetter?

A.

Since measures of center areappropriate, there would not be any better statistic to use in comparing the data sets.

B.

Since measures of center would not beappropriate, it would make more sense to talk about the minimum and maximum values for each data set.

C.

Because the data arematched, it would make more sense to investigate any outliers that do not fit the pattern of the other observations.

D.

Because the data arematched, it would make more sense to investigate whether there is an association or correlation between the two blood pressures.