1. It is correct that a pie chart is more appropriate for showing proportions or percentages out of the total as the area of each pie helps us visualize it more easily. In contrast, a bar chart can be a good way of comparing the frequency. In this example the categorical data being compared has only two values, more than 8 days and less than 8 days. If instead of only two categories, if we have a number of categorical data for comparison, a bar chart, or a pie chart can still be used. But, the Pie chart or the bar chart do not automatically order the percentages from highest to lowest. If we want to do that what chart should we choose?

2. Yes, presenting information well is as important as collecting the appropriate information for our research. Whenever we carry out any research, the goal is to find an answer to a problem or issue we may be facing and to make decisions based on those findings. So, collecting relevant information and data that can provide us a valid finding is certainly important. But the findings from the research will provide the most result only if we can convince all stakeholders involved with the issue to embrace the findings. This is where an effective presentation can play an important role. Can you use an example to show some common techniques we can employ to make an attractive presentation of data?

3. It is correct that while making a presentation it is important to ensure that not only the content being presented is appropriate and interesting but also to ensure that the presentation includes visual elements as it can enhance the impact among the audience. For the visual elements, the first rule is to make the text in the slides big enough for the audience to see them clearly and using bullet points to separate out the highlighted points. It is also important not to clutter a slide with too much material to make it look crowded. The next element is the proper use of graphics as it adds to the visual quality of the presentation. But it has to be also ensured that the graphics only help us to focus on the concepts being presented and do not take us away from the core goal of illustrating the concepts being discussed. In this context how do you think speaker notes can be used in a slide?

4. Good discussion of various graph types that are used for displaying data. Now, any data can be presented using many alternative graphical displays as listed above. But then why do these numerous types of graphical display exist? The answer is that for a data set, given the nature of the data and what message we are trying to highlight with that data, one graphical display may be superior to another graphical display. So, think of an example and discuss this aspect to get a more in-depth understanding about graphical displays.