Epidemiologists conducted a study to examine the relationship between number of steps per day and individuals' weight. They enrolled 500 participants. They collected weight data using a scale, and steps-per-day using a smart watch. Steps-per-day were measured for 1 month. The epidemiologists also administered a survey to collect self-reported exercise. The below are statements about the data collection methods. For each statement, mark if that aspect of data collection would be mostly likely to have resulted in random error, systematic error, or neither. Question 4 options: The batteries had to be replaced for about 10% of the pedometers; battery replacement took 2-4 hours. No steps were recorded when the battery was dead