The National Health and Nutrition Examination Survey (NHANES) is a collection of studies designed to assess the health and nutritional status of both adults and children in the United States.

Participants’ total cholesterol levels after fasting were measured in milligrams per decilitre of blood. The participants’ pulse rate at rest was also recorded as was their gender. According to guidelines on the management of cholesterol released by the Journal of the American College of Cardiology in 2018, cholesterol levels of 240 mg/dL and above are considered too high. The variable high cholesterol indicates whether the participant’s measured cholesterol was considered too high or not.

The main aim of this is to explore the variables in the dataset and to investigate any relationships between them. The main variable of interest is the total cholesterol of the participants. Each of the tasks below will guide you through various descriptive statistical analyses that will assist you to formulate a conclusion about the main aim. Your responses to these tasks should be represented in a well written manner with appropriate statistical analyses, and suitable conclusions in the context of each task. Appropriate computer output should be incorporated within the body of each response.

Task 1: Introduction

Write a small introduction to the report. This should only be a small paragraph outlining the purpose of the report and summarising the variables investigated, the experimental unit and the statistical techniques used.

Task 2: Basic Descriptive Statistics and Graphs

For the main variable of interest, Total Cholesterol, obtain some basic descriptive statistics as well as a histogram and a boxplot. Include a test for normality. After examining all of this output, briefly describe the shape of the total cholesterol distribution. Identify the measures of location and justify the most appropriate measure of location for Total Cholesterol. Identify the measures of spread for Total Cholesterol and justify the most appropriate measure. Make sure you include the values from the descriptive statistics in your discussion. Make comments on the presence or absence of any outliers (for example, what effect would they have on the summary statistics).

Transcribed Image Text:

Histogram of Total Cholesterols 60 50 40 30 20 10 75 150 225 300 375 450 525 600 Total Cholesterols Frequency Histogram of Total Cholesterols 60 50 40 30 20 10 75 150 225 300 375 450 525 600 Total Cholesterols Frequency

Answer rating: 100% (QA)

From the Histogram of total cholesterol we can see that the pl... View the full answer