4. The trend line describes the pattern if one exists
5. The first one (as there is inclusion of first quarter point at 13-18 = 16 and it shows the midpoint along with 26 greater to filled hole as data reaches 27) But I feel the forth one shows the 23-28 clearer so go with the 4th one.
6. The population is decreasing over time.
P / T = decrease
Box Plot revision.
In descriptive statistics, a box plot or boxplot is a method for graphically depicting groups of numerical data through their quartiles. Box plots may also have lines extending from the boxes indicating variability outside the upper and lower quartiles, hence the terms box-and-whisker plot and box-and-whisker diagram.
