Classify the following graph as a cross-sectional study or a time-series study. Average Temperature in Month 1 2 3 4 5 6 7 Temperature () 0 20 40 60 80 100 The horizontal axis is labeled Month and is divided into 7 categories which are labeled as follows: 1, 2, 3, 4, 5, 6, 7. The vertical axis is labeled Temperature () and is divided into 5 equally sized classes, with tick marks given at the start and end of each class which are labeled as follows: 0, 20, 40, 60, 80, 100. The bar graph displays the following data: Month 1 has a height of 79, Month 2 has a height of 83, Month 3 has a height of 75, Month 4 has a height of 60, Month 5 has a height of 45, Month 6 has a height of 38, Month 7 has a height of 28