Coefficients Intercept Estimate 504441 Std Error 477674 Int

Coefficients:

Intercept - Estimate: 50.4441 Std. Error: 47.7674

Intake - Estimate: 0.4529 Std. Error: 0.1154

Residual standard error: 84.45 on 11 degrees of freedom

a)Test whether the intercept and the slope coefficients are significant. What is your conclusion at = 0.01?

b) Estimate the mercury level for the mercury intake of 200. Find the 90% confidence interval for the mean response at this intake value.