At the beginning of Case 5, what happens when geographical variables are added to cross-country growth regressions, according to the reading?

Figure 4.26 associates an increase in secondary-school enrolment from 40% to 80% with income per head rising from roughly USD 500 to USD 7,000 along the regression line. Which inference is justified?

If we have a dataset with 8 features, how many models we will have to evaluate in total if we assume that we will use the SFS algorithm which begins search in the state 00000000 and finishes in state the 11111111. Explain your answer.

In what way a model changes when we do one iteration of the SFS algorithm?

Let's say we are using SFS algorithm and it currently is in the state 01101011. Write down all states which will be evaluated by the algorithm in the current iteration to decide where to move next. Explain your answer.

Let's say we have five models that correspond to the bit strings given below. If we assume that one of these models is overfitting our data, which one is it with the highest probability?