The horizontal axis is labeled “Methodology”, and has 3 markings from left to right as follows: “Quantitative”, “Qualitative”, and “Mixed”. The vertical axis is labeled “Number of Articles”, and ranges from 0 to 160 in increments of 20. The data for the bars is as follows: Quantitative: 142. Qualitative: 16. Mixed: 1.
Key research methodologies identified in the reviewed literature