A study is conducted to find out if the traffic light patterns at the busy intersection require to be adjusted to help the flow of traffic. Data upon the volume of traffic and the traffic patterns during different times of day are recorded.
I. What is the population?
II. What is the sample?
III. Is the study observational or experimental? Justify your answer.
IV. What are the variables?
V. For each of those variables, what level of measurement (nominal, ordinal, interval, or ratio) was used to obtain data from these variables?