Using 20 observations, the multiple regression model y = β0 + β1x1 + β2x2 + ε was estimated. A portion of the regression

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Using 20 observations, the multiple regressionmodel y = β0 + β1x1 + β2x2 + ε wasestimated. A portion of the regression results is as follows:
a. At the 5% significance level, are theexplanatory variables jointly significant?
b. At the 5% significance level, is eachexplanatory variable individually significant?
c. What is the likely problem with thismodel?