Consider the scatterplot of sample data for ten individuals and simple regression analysis performed in Q1.   The R2 value is for your sample is 0.122, and the observed F-statistic is 1.11.   To determine whether R2 is statistically significant, you decide to compare your observed F-statistic to the critical value in the F-distribution. To find this critical value, you need to first calculate the appropriate degrees of freedom. The formulas are:   df1 = k df2 = n - k - 1   (where k = number of independent variables, and n = sample size)   What are the degrees of freedom for this sample? 单项选择题