a) One can use data analysis for politics and policy. They can also use data analysis to see if a certain country's population is going at a smooth pace. If they can see that people die at certain times, they can take the chance to find out the reason and improve the condition so that less people will suffer death at that certain period.
b) If we were saving up money to buy a certain item, we can use the data analysis to collect data on how much we were saving over the past few days, and continue the days with the same amount spent/saved, we would be able to roughly estimate by when would have that amount of money to buy the item.
Done: Joshua, Qadirah and Beatrys