# 15. Metal Corrosion and Soil Acids In an investigation to determine the relationship between the degree of

## Question:

15. Metal Corrosion and Soil Acids In an investigation to determine the relationship between the degree of metal corrosion and the length of time the metal is exposed to the action of soil acids, the percentage of corrosion and exposure time were measured weekly.

**a.** What percentage of the total variation is explained by the quadratic regression of y on x?

**b.** Is the regression on x and x2 significant at the a 5.05 level of significance?

**c.** Is the linear regression coefficient significant when x2 is in the model?

**d.** Is the quadratic regression coefficient significant when x is in the model?

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**Related Book For**

## Introduction To Probability And Statistics

**ISBN:** 9780357114469

15th Edition

**Authors:** William Mendenhall Iii , Robert Beaver , Barbara Beaver