The health department of a large city has developed an air pollution index that measures the level
Question:
a. Taking the air pollution index as an independent variable and the number of emergency admissions as a dependent variable, do you expect B to be positive or negative in the regression model y = A + Bx + E?
b. Find the least squares regression line. Is the sign of b the same as you hypothesized for B in part a?
c. Compute r and r2, and explain what they mean.
d. Compute the standard deviation of errors.
e. Construct a 90% confidence interval for B.
f. Test at a 5% significance level whether B is positive.
g. Test at a 5% significance level whether p is positive. Is your conclusion the same as in part f?
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