If the Coefficient of Correlation R = -

question 31

True/False

If the coefficient of correlation r = -.81,the standard deviations of x and y are 20 and 25,respectively,then cov(x,y)must be -405.0.

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Definitions:

Crimean War

A military conflict fought from 1853 to 1856 between the Russian Empire and an alliance of the Ottoman Empire, France, Britain, and Sardinia, largely over the rights of Christian minorities in the Holy Land.

Britain and France

Two major European powers with a long history of rivalry, conflict, and cooperation that have had significant influences on global politics, culture, and economics.

Piedmont-Sardinia

A kingdom in northwestern Italy, which played a leading role in the Italian unification movement of the 19th century, led by its Prime Minister, Count Camillo di Cavour.

Giuseppe Mazzini

An Italian politician, journalist, and activist for the unification of Italy in the 19th century, who passionately promoted democracy and republicanism.