The two questions that would be good for gathering statistics to create a scatter plot, draw a line of best fit, and interpret the slope and y-intercept in context are:
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How tall are the students in your grade level at school? - This question allows for quantitative data collection on students' heights, enabling the creation of a scatter plot with height against another variable (e.g., age) for analysis.
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How is college student enrollment changing over the last century? - This question involves a time series analysis, where student enrollment figures over time can be plotted to observe trends, allowing for the calculation of a line of best fit to interpret changes in enrollment rates.
The other options either involve categorical data or are not suitable for scatter plot analysis.