Question

An engineer is evaluating two HVAC controllers for use in a large project. Each unit was used to control the air temperature in a test chamber that was subjected to external heating to simulate a day/night cycle. The line plot below shows the results for the two units for a twenty-four-hour period, along with the target temperature. Identify any misrepresentation issues in the graph. Select all that apply: - The horizontal axis scale is not appropriate.- The horizontal axis ticks are not placed correctly.- The vertical axis scale is not appropriate. -The vertical axis ticks are not placed correctly. -The axis labeling is not complete.- The graph is designed appropriately.

Answer 1

Looking at the graph, we can see that the plots "Controller 1", "Controller 2" and "Target" are very close to each other, we can't find the actual difference in the temperature, because the scale in the vertical axis is not appropriate. The values in this axis should be closer to each other (for example: 67.6, 67.8, 68, 68.2 and 68.4), this way we could see better the difference of the plots regarding the temperature.

So the correct option is the third one: The vertical axis scale is not appropriate.

Also, the fifth option is also correct: The graph is designed appropriately, because the structure of the graph is ok.