A researcher set out to determine whether suicide and homicide rates in metropolitan areas around the country are correlated and, if so, whether they vary inversely (negative correlation) or together (positive correlation). Using available data for a recent year, he compared the following sample of 10 metropolitan areas with respect to their rates (number per 100,000), of suicide and homicide:
What is the strength and direction of correlation between suicide and homicide rates among the 10 metropolitan areas sampled? Test the null hypothesis that rate of suicide and homicide are not correlated in the population.
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