These variables were also measured for 17 additional sub-Saharan African countries, and the regression equation was found to be:

y=7.0-0.03x

Given that the estimated standard error of the slope is 0.14, test the null hypothesis that the slope is equal to -0.06 (the slope for the data from countries around the world). What do you conclude?

What is the Pearson correlation coefficient measuring the strength of the linear association between fertility rate and prevalence of contraceptive practice for the 17 African countries?The coefficient of determination for the model estimated using the 17 sub-Saharan African countries is 0.25. What does that tell you?