Which of the following structures is consistent with the IR spectra shown below? 
Definitions:
Independent Variables
Variables in a statistical or mathematical model that are manipulated or have their values set externally to observe or measure their effect on dependent variables.
Degrees of Freedom
The number of independent values or quantities which can vary in the calculation of a statistic.
Critical Value of F
The threshold value determined from an F-distribution, given a certain significance level, used in analysis of variance (ANOVA) to decide whether to reject the null hypothesis of equal variances.
Predictor Variables
Variables in a statistical model that are used to predict or explain changes in the response variable.
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