FILEThe following table shows the World Bank's 2008 ranking of the richest countries, as measured by per capita GNP. The data are also available on the text website, labeled WB ranking.

In addition, it gives each country's respective rank with respect to infant mortality according to the Central Intelligence Agency.

A higher rank indicates a lower m ortality rate.

Country Per Capita GNP Rank Infant Mortality Rank Luxembourg 1 7 Norway 2 4 Singapore 3 1 United States 4 10 Ireland 5 9 Switzerland 6 5 Netherlands 7 8 Austria 8 6 Sweden 9 2 Iceland 10 3

a. Calculate and interpret the Spearman rank correlation coefficient rs.

b. Specify the competing hypotheses in order to determine whether the correlation coefficient is significantly different from zero.

c. At the 5% significance level, specify the critical value and the decision rule.

d. Are GNP and the infant m ortality rate correlated?
Explain.