The following table shows the World Bank's 2008 ranking of the richest countries, as measured by per

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The following table shows the World Bank's 2008 ranking of the richest countries, as measured by per capita GNP. 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 mortality rate.

The following table shows the World Bank's 2008 ranking of

a. Calculate and interpret the Spearman rank correlation coefficient rs .
b. Specify the competing hypotheses to determine whether the Spearman rank correlation coefficient is different from zero.
c. At the 5% significance level, specify the critical value and the decision rule.
d. Are GNP and the infant mortality rate correlated? Explain.

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