## Related questions with answers

Question

Researchers studying acid rain measured the acidity of precipitation in a Colorado wilderness area for 150 consecutive weeks. Acidity is measured by pH. Lower pH values show higher acidity. The researchers observed a linear pattern over time. They reported that the regression line

$\widehat{pH} = 5.43 - 0.0053$

(weeks) fit the data well. Identify the y intercept of the line and explain what it means in this setting.

Solution

VerifiedStep 1

1 of 2The y-intercept in this equation is 5.43. In this setting that means when 0 weeks have passed the PH is predicted to be 5.43

The y-intercept is the value of the response variable when the explanatory variable is 0.

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