Selected Office for Each of the Twelve Months Prior to the Exercise

question 30

Essay

selected office for each of the twelve months prior to the exercise program and then for each of the
twelve months after the exercise program is initiated. The "before" and "after" expenses are
compared on a month-to-month basis. Which test design would be the most appropriate for this
scenario?
-Recently, it was reported that the proportion of people using seatbelts while driving has begun to drop after years of steady increases. To determine the proportion of drivers using seatbelts in a particular community, it was decided to set up a checkpoint on a busy road and stop every twentieth driver to see if he/she was using a seatbelt. What kind of sampling does this illustrate?