The following sums were obtained from 10 sets of observations on I, X, and X₂ : ΣΙ = 20 ΣΧ=92 Σ.ΧΧ, =119 Σ Υ = 30 ΣΧ =163 ΣΥ, = 40 a. 0,714 b. 0,691 Ο c. 0,523 d. 0,477 O e. 0,286 ΣΥΧ =59 The coefficient of determination (R²) is ΣΤ' = 88.2 ΣΧ, = 88

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