As gas emissions from power plants around the world become an increasing threat to the environment, international agencies are examining the effect of carbon dioxide levels on smog concentration in 10 of our major cities. Preliminary calculations are shown here.

a. If the correlation coefficient proves significant at the 5% level several national governments have vowed to take action to reduce emissions. What is your recommendation to them in this regard?

b. A high-level governmental official wishes to learn how significant the findings are. What do you report?

c. Another world leader asks about the lowest level of α at which the null hypothesis can be rejected. What is your response?

d. As a portion of the consulting position you hold in the international community you are to test the hypothesis that the regression coefficient for the population as a whole is zero despite the study's findings. What is your response? Set α at 1%.

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Sums Means |4- b- S Emissions (X) Smog (Y) (X-X) (Y-V) 909.00 218.10 5464.90 SS SS 137.00 10 13.700 4.776 15.469 7.824167687 80.900 (X-XXY-V) 1041.70 SSV