How to Answer Visual-Information Questions on the Praxis Core Reading Test
The most unusual thing about the Praxis reading test is that it includes what are referred to as visual-information questions, which is the Praxis’s fancy term for questions about charts and graphs. Most reading and writing tests don’t do this.
Rethinking charts and graphs
If charts and graphs make you nervous because they seem more like math and science stuff than reading and writing stuff, the first step for you is to think about visual representation questions differently. Regardless of appearances, these questions really are reading comprehension questions at heart.
A graph can be thought of as a visual depiction of information that could also be presented verbally.
Just as you could either compose the sentence “A horse jumps over a fence” or you could draw a picture of a horse jumping over a fence to represent the same idea, a bar graph, line graph, pie chart, or any other type of chart or graph can be thought of as verbal information presented in pictorial form.
So relax. The visual-information questions are reading comprehension questions. They’re just weird ones.
The most common type of a graph is a line graph. A line graph represents the relationship between two variables: an independent variable plotted along the x (horizontal) axis and a dependent variable plotted along the y (vertical) axis. The line running through the quadrant formed by their intersection is what you look at to figure out what value for one variable equals what value for the other.
So say you had a line graph that plotted the relationship between “hours spent studying” and “score on the Praxis reading test.” The “hours spent studying” would be plotted with hatch marks along the horizontal axis, and the various possible “scores on the Praxis reading test” would be plotted along the vertical axis, because this is the variable that depends on the other one.
If you want to know the score someone would get who studied for, say, five hours, you’d just proceed upward from the 5-hour hatch mark on the bottom until you hit the line representing the actual data, then turn and go left until you hit the corresponding score on the side of the graph.
Another type of graph commonly found in Praxis visual-information questions is a bar graph. Rather than depicting the relationship between an independent and a dependent variable like a line graph does, a bar graph represents how different categories stack up against each other with respect to some particular idea.
For example, you might use a bar graph to compare the number of World Series won by various baseball teams.
The names of all the teams would be plotted along the horizontal with a bar above each name, and the heights of the bars would indicate the number of World Series each team had won, with the vertical axis of the graph hatch-marked to indicate how many championships were represented by a given bar height.
The bar representing the New York Yankees would be very high; the bars representing the St. Louis Cardinals, Oakland Athletics, and Boston Red Sox would be lower, but still respectably high; and the San Diego Padres and Texas Rangers wouldn’t have bars over their names at all.
You could also plot that same information with another common type of graph called a pie chart. The difference between a pie chart and a bar graph is that a pie chart represents percentages of a total, so it looks like a circle with different-sized triangular pieces marked off inside it.
On a World Series pie chart, the Yankees’ slice of the pie would be nearly one-fourth of the whole pie, as there have been 109 World Series and the Yankees have won 27 of them. The Cardinals’ slice would be about one-tenth of the pie (11 World Series victories out of 109). The teams that have never won a World Series wouldn’t appear on the pie at all.
Based on the preceding graph, the biggest drop-off in popularity between consecutively ranked pets is between
(A) the most popular pet and the second-most-popular pet.
(B) the second-most-popular pet and the third-most-popular pet.
(C) the third-most-popular pet and the fourth-most-popular pet.
(D) the fourth-most-popular pet and the fifth-most-popular pet.
(E) The drop-offs in popularity between the first- and second-most-popular pets and between the third- and fourth-most-popular pets were equally large.
The correct answer is Choice (B). In order to answer this question correctly, you have to think about the pets in order of most popular to least popular — that is, rank them consecutively as the question states.
The biggest drop-off in popularity between consecutively ranked pets by a fairly wide margin is between cats (the second-most-popular pet, chosen by 25 students) and fish (the third-most-popular pet, chosen by about 17 or 18 students), with a drop-off of 7 or 8 votes.
Note that the bar graph doesn’t allow you to judge perfectly how many students voted for fish, but that doesn’t matter. Whether fish got 17 or 18 votes, the biggest drop-off in popularity is still between cats and fish.
Choice (A) is wrong because cats only got two or three fewer votes than dogs, so this isn’t the biggest drop-off in popularity. Choice (C) is wrong because ferrets only got three or four fewer votes than fish, so this isn’t the biggest drop-off in popularity. Choice (D) is wrong because hamsters only got one or two fewer votes than ferrets, so this isn’t the biggest drop-off in popularity.
Choice (E) is wrong because, although it is true that the gap between dogs and cats and the gap between fish and ferrets are equally large, neither of them is the largest drop-off in popularity. It doesn’t matter that they were equally large, because the question was asking for the largest drop-off! Be careful!