Child labor in diamond mines. The role of child laborers in Africa’s colonial-era diamond mines was the subject of research published in the Journal of Family History (Vol.

35, 2010). One particular mining company lured children to the mines by offering incentives for adult male laborers to relocate their families close to the diamond mine.

The success of the incentive program was examined by determining the annual accompaniment rate, i.e., the percentage of wives (or sons or daughters) who accompanied their husbands (or fathers) in relocating to the mine. The accompaniment rates over the years 1939–1947 are shown in the table below.

a. Find the correlation coefficient relating the accompaniment rates for wives and sons. Interpret this value.

b. Find the correlation coefficient relating the accompaniment rates for wives and daughters. Interpret this value.

c. Find the correlation coefficient relating the accompaniment rates for sons and daughters. Interpret this value.

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Year Wives Sons Daughters 1939 27.2 2.2 16.9 1940 40.1 1.5 15.7 1941 35.7 0.3 12.6 1942 37.8 3.5 22.2 1943 38.0 5.4 22.0 1944 38.4 11.0 24.3 1945 38.7 11.9 17.9 1946 29.8 8.6 17.7 1947 23.8 7.4 22.2