he National Health and Nutrition Examination Survey (NHANES) is a national surve
ID: 3237474 • Letter: H
Question
he National Health and Nutrition Examination Survey (NHANES) is a national survey of health and nutrition conducted by the Centers for Disease Control. The following data is from 2007-08 and is based on 2,793 total observations (there are missing values for some variables). The following is a correlation matrix for several variables from the survey. These include:
Systolic - systolic blood pressure ready. Levels greater than 140 are considered high blood pressure.
Disatolic – diastolic blood pressure reading. Levels greater than 90 are considered high blood pressure.
BMI – Body Mass Index
Age – Age of subject in years
SEXDum – a dummy variable where 0 = Female and 1 = Male
Correlations
The interpretation of the correlation between Systolic and SEXDum is
There is a strong positive relationship between SEXDum and Systolic
Systolic Disatolic BMI Age SEXDum Systolic 1.0000 0.5876 0.2312 0.3735 0.1669 Disatolic 0.5876 1.0000 0.1801 0.3647 0.1465 BMI 0.2312 0.1801 1.0000 0.1088 -0.0772 Age 0.3735 0.3647 0.1088 1.0000 0.0195 SEXDum 0.1669 0.1465 -0.0772 0.0195 1.0000Explanation / Answer
The correlation between Systolic and SEXDum is 0.1669.
Since variable SEXDum is nominal so we cannot define exact correlation between Systolic and SEXDum. But since male =1 so
D.Males have slightly higher levels of systolic blood pressure than females.
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