The Environmental Protection Agency is examining the relationship between the ozone level (in parts per million) and the population (in millions) of U. S. cities. Part of the regression analysis is shown.

a) We suspect that the greater the population of a city, the higher its ozone level. Is the relationship statistically significant? Assuming the conditions for inference are satisfied, test an appropriate hypothesis and state your conclusion in context.
b) Do you think that the population of a city is a useful predictor of ozone level? Use the values of both R2 and s in your explanation.

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Dependent variable s 0zone R-squared-84.4% s= 5.454 with 16-2=14 df SE (Coeff) 2.395 1.910 Variable Intercept Pop Coeff 18.892 6.650