Concept explainers
At the beginning of this chapter, we presented selected OECD healthcare data for the 34 member countries for the year 2011 or, in a few cases, the nearest year to that. Recall that % GDP is an abbreviation for “healthcare expenditures as a percentage of gross domestic product,” LE for “life expectancy” (at birth), and IMR for “infant mortality rate” (number of deaths of babies under 1 year of age per 1000 live births).
Now that you have studied
- a. Considering % GDP as the predictor variable and LE as the response variable, construct a
scatterplot of the data. - b. Does the data point for the United States appear to be an outlier? Explain your answer and discuss it in the context of % GDP and LE.
- c. Find the regression equation for the data, both with and without the data point for the United States. Plot the regression lines and the data points.
- d. Is the data point for the United States an influential observation? Explain your answer and discuss it in the context of % GDP and LE.
- e. Obtain the coefficient of determination, both with and without the data point for the United States. Interpret your results.
- f. Determine the
correlation coefficient , both with and without the data point for the United States. Interpret your results. - g. Repeat parts (a) – (f) with % GDP as the predictor variable and IMR as the response variable.
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