1. What form of graph should be used for variables with each of the following levels of measurement? 1.a) discrete nominal - bar chart or bar graph 1.b) discrete ordinal - histogram 1.c) continuous interval-ratio - polygon 2. Calculate the midpoint of each class interval (and report under the m column) and compute N (sample size). Ages of persons enrolled in a work-release program X m f 18-23 20,5 10 24-29 717 24.5 7 30-35 32.5 9 36-41 5 12 38.5 42-47 4 4, 5 8 12 48-53 50.5 54-59 565 2 m 60-65 6205 66-71 67.5 72-77 74.5 50