SAMPLE Dental Hygiene Entrance Exam Prep

Dental Hygiene Entrance Exam Preparation Study Guide

4.1.2 Histograms Is a common method to graphically represent the frequencies data set. A histogram can be used for a larger data set. For example, if you have a large population and are gathering statistical exam scores from numerous area colleges, you may have 100 students out of500 who receive a 94 on an exam. That is a large data set and it is not practical to generate a stem-and-leaf plot. Histograms are usually generated using graphing or statistical software. You can also generate them by hand! Let’s take a look at a histogram.

This is the typical structure of a histogram. What type of information can we obtain from a histogram? Although I have not assigned any actual data or numerical values, we can see that there are several parts to the histogram. ● The solid box seems to be the highest. This represents the highest frequency for the data set. Therefore, ifwe were to look at a data set, the majority ofthe values would fall within the region of the solid box. ● Now looking to the right and left of our highest frequency, we can see that the histogram is divided into two sides. The polka-dot and striped boxes are to the left of our highest frequencies. These represent higher values than our frequency. If that is confusing, think of it this way. We will say the data represents the amount of time it takes students to complete an exam. Most ofthe students take 65 minutes to complete the exam (solid box), the polka-dot and striped boxes represent the number of students who take less than 65 minutes to complete the exam. We will say the striped box represents students who can complete the exam in 55 minutes and the polka-dot box represents students who can complete the exam in 45 minutes. o You can see that there are fewer students who completed the exam in 45 minutes. ● We also have data to the right ofour highest frequency, the brick and checkered boxes.

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