This is the full question.

Is the number of days a letter takes to reach another city from one particular post office affected by the time of day it is mailed? Design an observational study to answer the question. The steps for designing a study are: Step 1: Determine the focus of the study (the important variable and what information must be gathered in order to answer the main question). Step 2: Develop a plan to collect the data. Step 3: Determine the most appropriate sampling method (Once the design is complete, you would then collect the data, interpret the data, and report the findings of the study)