Problem 8E

The article “Oxidation State and Activities of Chromium, Oxides in CaO-SiO2-CrOx Slag System” (Y.7. The National Xiao, L. Holappa, and M. Reuter, Metallurgical and Materials Transactions B, 2002:595-603) presents the amount x (in mole percent) and activity coefficient y of CrO1.5 for several specimens. The data, extracted from a larger table, are presented in the following table.

X |
Y |
X |
Y |
X |
Y |

10.20 |
2.6 |
7.13 |
5.8 |
5.33 |
13.1 |

5.03 |
19.9 |
3.40 |
29.4 |
16.70 |
0.6 |

8.84 |
0.8 |
5.57 |
2.2 |
9.75 |
2.2 |

6.62 |
5.3 |
7.23 |
5.5 |
2.74 |
16.9 |

2.89 |
20.3 |
2.12 |
33.1 |
2.58 |
35.5 |

2.31 |
39.4 |
1.67 |
44.2 |
1.50 |
48.0 |

a. Compute the least-squares line for predicting y from x.

b. Plot the residuals versus the fitted values.

c. Compute the least-squares line for predicting y from 1/x.

d. Plot the residuals versus the fitted values.

e. Using the better fitting line, find a 95% confidence interval for the mean value of y when x = 5.0.

Tuesday, August 23, 2016 WILDLIFE ECOLOGY Contact through ann.randall@colostate.edu Course Goals: ~ Foundation concepts and terminology ~ Conservation ~ Broaden perspectives and awareness ~ Guest lectures ~ Look to the future Review syllabus and study and take quiz by 8/30 May have some changes to deadlines All readings are online No makeup exams ~ Tests are multiple choice and true false Thursday, August 25, 2016 Important terms and definitions ● Biology study of living organisms ● Wildlife nondomesticated animals in their natural environme