A nationwide study was done to assess the programming proficiency of students taking a statistical programming class.The students were asked their proficiency in the statistical software SAS.The survey was sent to students at over 100 universities and 112 responses were received from 21 different universities.The results were published in the journal International Mathematical Forum in 2011.The results in the form of a pie chart are shown below. 
It would have been better to display the data in a histogram.
Definitions:
University
An educational and research entity that grants academic titles in several fields of study.
Voluntary Response Sampling
A sampling method where participants decide for themselves whether to be included in the study, often leading to bias.
Utility Rates
The prices charged for essential public services such as electricity, gas, water, and sewage.
Phone-in Survey
A research method where participants provide their responses or opinions over a phone call, commonly used for collecting data from a wide geographical area.
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