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Q46Section ST (Statistics (Q11–Q65))46 of 65

F-test statistic for the slope

Consider the simple linear regression model yi=α+βxi+ϵi,  i=1,2,…,24y_i = \alpha + \beta x_i + \epsilon_i, \; i = 1, 2, \dots, 24, where α∈R\alpha \in \mathbb{R} and β∈R\beta \in \mathbb{R} are unknown parameters, the errors ϵi\epsilon_i's are i.i.d. random variables having N(0,σ2)N(0, \sigma^2) distribution, where σ>0\sigma > 0 is unknown. Suppose the following summary statistics are obtained from a data set of 24 observations (x1,y1),…,(x24,y24)(x_1, y_1), \dots, (x_{24}, y_{24}): Sxx=∑i=124(xi−xˉ)2=22.82S_{xx} = \sum_{i=1}^{24} (x_i - \bar{x})^2 = 22.82, Syy=∑i=124(yi−yˉ)2=43.62S_{yy} = \sum_{i=1}^{24} (y_i - \bar{y})^2 = 43.62, and Sxy=∑i=124(xi−xˉ)(yi−yˉ)=15.48S_{xy} = \sum_{i=1}^{24} (x_i - \bar{x})(y_i - \bar{y}) = 15.48, where xˉ=124∑i=124xi\bar{x} = \frac{1}{24} \sum_{i=1}^{24} x_i and yˉ=124∑i=124yi\bar{y} = \frac{1}{24} \sum_{i=1}^{24} y_i. Then, for testing H0:β=0H_0: \beta = 0 against H1:β≠0H_1: \beta \ne 0, the value of the FF-test statistic based on the least squares estimator of β\beta, whose distribution is F1,22F_{1,22}, equals (rounded off to two decimal places)

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